{"gene":"RND3","run_date":"2026-06-10T06:43:37","timeline":{"discoveries":[{"year":2003,"finding":"RhoE binds directly to ROCK I (but not ROCK II or other RhoA targets tested), interacting with the amino-terminal kinase domain region of ROCK I at a site distinct from the RhoA-binding site. This interaction was confirmed by co-immunoprecipitation of endogenous proteins, and RhoE and ROCK I co-localized on the trans-Golgi network. RhoE overexpression inhibited ROCK I-induced stress fiber formation and phosphorylation of myosin light chain phosphatase, demonstrating that RhoE induces stress fiber disassembly by directly binding and inhibiting ROCK I.","method":"Co-immunoprecipitation of endogenous proteins, colocalization imaging, overexpression with ROCK I activity readouts (MLC phosphatase phosphorylation, stress fiber formation)","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP of endogenous proteins, colocalization, functional readouts; independently replicated across multiple subsequent studies","pmids":["12773565"],"is_preprint":false},{"year":1998,"finding":"RhoE (mouse) binds GTP but does not detectably bind GDP and has low intrinsic GTPase activity. Microinjection of RhoE in macrophages and MDCK cells induced actin reorganization and complete disappearance of stress fibers, while RhoE localized to lateral membranes of MDCK cells. RhoE increased migration speed of HGF-stimulated MDCK cells, in contrast to RhoA inhibition of migration.","method":"Biochemical GTP/GDP binding assays, GTPase activity assays, microinjection, immunofluorescence, migration assays","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — direct biochemical assays plus live-cell functional readouts; foundational paper replicated by many subsequent studies","pmids":["9671486"],"is_preprint":false},{"year":2002,"finding":"Crystal structure of RhoE/Rnd3 core G-protein domain in complex with GTP and Mg2+ at 2.1 Å resolution revealed that serines at positions equivalent to Ala59 and Gln61 in Ras account for the lack of GTP hydrolysis: the absent conserved glutamine raises the transition state energy, and the serines stabilize the GTP-bound switch II conformation and may prevent catalytic water positioning.","method":"X-ray crystallography at 2.1 Å resolution","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure with structural mechanistic explanation for constitutive GTP-bound state","pmids":["12009891"],"is_preprint":false},{"year":2005,"finding":"ROCK I phosphorylates RhoE on multiple residues in vitro. In cells, ROCK I-phosphorylated RhoE localizes to the cytosol whereas unphosphorylated RhoE is membrane-associated. Phosphorylation does not affect RhoE binding to ROCK I but increases RhoE protein stability. Using phospho-specific antibodies, ROCK I was shown to phosphorylate endogenous RhoE at serine 11 upon PDGF stimulation, and this phosphorylation requires active PKC signaling. Phosphorylation correlates with RhoE's ability to induce stress fiber disruption and inhibit Ras-induced transformation.","method":"In vitro kinase assay, phospho-specific antibodies, subcellular fractionation, cell stimulation assays, protein stability measurements","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vitro kinase assay plus phospho-specific antibody validation in cells with multiple orthogonal readouts","pmids":["15775972"],"is_preprint":false},{"year":2008,"finding":"Crystal structure of RhoE in complex with the ROCK I kinase domain at high resolution revealed that RhoE interacts with the C-lobe αG helix of ROCK I via a novel binding site remote from its effector region, positioning its N and C termini proximal to the ROCK I catalytic site to enable multi-site phosphorylation. Disruption of the ROCK I:RhoE interface abolished RhoE phosphorylation but had no effect on RhoE-mediated stress fiber disassembly. Mutation of the RhoE effector region attenuated actin cytoskeleton disruption, indicating RhoE exerts inhibitory effects on ROCK I through protein(s) binding its effector region.","method":"X-ray crystallography, site-directed mutagenesis, functional actin cytoskeleton assays","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure plus mutagenesis with functional validation in cells","pmids":["18946488"],"is_preprint":false},{"year":2008,"finding":"PDK1 competes directly with RhoE for binding to ROCK1 at the plasma membrane in a non-catalytic manner. In the absence of PDK1, negative regulation by RhoE predominates, causing reduced acto-myosin contractility and motility. PDK1 depletion alters ROCK1 localization and reduces its ability to drive cortical acto-myosin contraction.","method":"siRNA depletion, direct binding competition assays, localization imaging, MLC phosphorylation readouts, in vivo motility assays","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct binding competition demonstrated, multiple orthogonal methods, published in high-impact journal","pmids":["18204440"],"is_preprint":false},{"year":2004,"finding":"RhoE expression inhibits cell cycle progression and serum-induced S-phase entry. RhoE-expressing cells failed to accumulate cyclin D1 or p21(cip1) protein or activate E2F-regulated genes despite normal ERK, PI3K/Akt, FAK, and Rac activation. Expression of proteins bypassing the pRb checkpoint (HPV E7, adenovirus E1A, cyclin E) rescued cell cycle progression. RhoE also inhibited Ras- and Raf-induced fibroblast transformation. Neither ROCK nor RhoA inhibition accounted for the cell cycle response.","method":"Inducible RhoE expression system, BrdU/flow cytometry cell cycle analysis, western blotting for cyclin D1/p21/Rb, epistasis with E7/E1A/cyclin E rescue","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — inducible expression system with genetic epistasis experiments and multiple orthogonal readouts","pmids":["15340047"],"is_preprint":false},{"year":2000,"finding":"Raf activation downstream of oncogenic Ras induces expression of Rnd3 (via the MEK/ERK pathway), which acts as an endogenous inhibitor of Rho function to cause loss of actin stress fibers without reducing Rho-GTP levels. Expression of Rnd3 alone at levels equivalent to Raf transformation caused substantial loss of actin stress fibers. Pharmacological MEK inhibition prevented Rnd3 induction and preserved stress fibers.","method":"Conditional Raf activation, Rho pull-down GTP-loading assay, Rnd3 overexpression, MEK inhibitor treatment, actin immunofluorescence","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — inducible oncogene system, pathway inhibitors, direct expression measurement with functional readouts","pmids":["11094087"],"is_preprint":false},{"year":2000,"finding":"A novel Staphylococcus aureus C3-like ADP-ribosyltransferase (C3Stau) modifies RhoE and Rnd3 by ADP-ribosylation at Asn-44 (equivalent to Asn-41 in RhoA), in addition to RhoA. This was confirmed in vitro with recombinant proteins and in vivo in Xenopus laevis oocytes expressing RhoE.","method":"In vitro ADP-ribosylation assay with recombinant proteins, in vivo modification in Xenopus oocytes, cloning of C3Stau from genomic DNA","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro biochemical assay plus in vivo validation in Xenopus; single lab but two orthogonal systems","pmids":["11124969"],"is_preprint":false},{"year":2006,"finding":"RhoE is a transcriptional target of p53. Genotoxic stress triggers p53-dependent RhoE induction, which causes actin stress fiber disassembly. RhoE inhibits ROCK I activity during genotoxic stress and thereby suppresses apoptosis. Silencing of RhoE induction in response to genotoxic stress increased apoptosis, indicating RhoE promotes cell survival by inhibiting ROCK I-mediated apoptosis.","method":"siRNA knockdown, luciferase reporter assays for p53-dependent RhoE transcription, ROCK I activity assays, apoptosis measurements, stress fiber immunofluorescence","journal":"Current biology : CB","confidence":"High","confidence_rationale":"Tier 2 / Strong — transcriptional target validated by reporter assay, functional rescue experiments, multiple orthogonal methods","pmids":["17174923"],"is_preprint":false},{"year":2009,"finding":"PKCα directly phosphorylates Rnd3 in vitro and in cells (upon PKC agonist stimulation). PKCα-mediated phosphorylation causes an electrophoretic mobility shift and enrichment of Rnd3 at internal membranes. This does not occur in PKCα-null cells or with a non-phosphorylatable Rnd3 mutant. PKCα phosphorylation affects Rnd3's ability to block Rho-ROCK pathway signaling.","method":"In vitro kinase assay with PKCα, PKCα-null cells, non-phosphorylatable Rnd3 mutant, subcellular fractionation, ROCK pathway readouts","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — in vitro kinase assay plus genetic null cells plus phosphorylation-defective mutant; multiple orthogonal methods in single lab","pmids":["19723022"],"is_preprint":false},{"year":2008,"finding":"N-terminus-mediated dimerization of ROCK I is required for RhoE binding. The central coiled-coil domain can dimerize ROCK I but is insufficient without the N-terminus to allow RhoE binding. ROCK I kinase activity is required for N-terminal dimerization and RhoE binding, although inclusion of part of the coiled-coil domain can compensate for lack of kinase activity. N-terminus-mediated dimerization is also required for ROCK I to induce stellate actin stress fibers in cells.","method":"ROCK I domain deletion mutants, dimerization assays, RhoE binding assays, kinase-dead mutants, actin stress fiber formation assays in cells","journal":"The Biochemical journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain mapping with multiple mutants and functional readouts, single lab","pmids":["18215121"],"is_preprint":false},{"year":2009,"finding":"RhoE inhibits phosphorylation of the translational repressor 4E-BP1 in response to extracellular stimuli independently of mTOR (S6K phosphorylation, mTOR/Raptor association unaffected by RhoE). RhoE prevents release of eIF4E from 4E-BP1, thereby inhibiting cap-dependent translation. This mechanism explains RhoE-mediated inhibition of cyclin D1 translation and c-Myc expression. eIF4E overexpression rescued cell cycle progression and Ras-induced transformation in RhoE-expressing cells.","method":"Western blotting for 4E-BP1/eIF4E interaction (cap pull-down), S6K phosphorylation, mTOR/Raptor co-IP, eIF4E rescue experiments, transformation assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal biochemical assays establishing mTOR-independent 4E-BP1 regulation with eIF4E genetic rescue","pmids":["19850923"],"is_preprint":false},{"year":2012,"finding":"Rnd1 and Rnd3, but not Rnd2, contain a KERRA sequence in their N-terminus that functions as a lipid raft-targeting determinant. Lipid raft targeting is required for p190 RhoGAP activation by Rnd1 and Rnd3. This mechanism accounts for the functional difference between Rnd proteins in RhoA inhibition signaling despite all three Rnd proteins binding p190 RhoGAP equally in vitro.","method":"N-terminal deletion/mutation analysis, lipid raft fractionation, p190 RhoGAP activity assay","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain mapping with fractionation and functional GAP activity assay, single lab","pmids":["22357615"],"is_preprint":false},{"year":2010,"finding":"Rnd3 binds to the RhoA GEF Syx (synectin-binding RhoA exchange factor) identified by unbiased two-step affinity purification and mass spectrometry. The Syx interaction with Rnd3 occurs through a region similar to the Raf1 Ras-binding domain (RBD), not via the Syx DH domain. Rnd3 negatively regulates Syx activity in vivo, as shown by zebrafish morpholino knockdown rescue experiments where a Rnd3-binding defective Syx mutant (E164A/R165D) was more potent at rescuing embryonic defects than wild-type Syx.","method":"Affinity purification/mass spectrometry, domain mutation binding assays, zebrafish morpholino knockdown, mRNA rescue with wild-type vs. Rnd3-binding mutant","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — unbiased mass spectrometry identification with in vivo genetic rescue validation, single lab","pmids":["20811643"],"is_preprint":false},{"year":2013,"finding":"Rnd3 interacts physically with the Notch intracellular domain (NICD), promotes NICD ubiquitination, and facilitates protein degradation of NICD, CSL, and MAML1 (components of the Notch transcriptional complex). Rnd3 facilitates binding of NICD to FBW7 (ubiquitin ligase) to enhance NICD degradation, thereby inhibiting Notch transcriptional activity. In mice, Rnd3 genetic deletion caused hydrocephalus through decreased NICD protein degradation and enhanced Notch signaling, which was rescued by Notch inhibition.","method":"Co-immunoprecipitation, ubiquitination assays, siRNA knockdown, genetic knockout mice, pharmacological Notch inhibition rescue","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, ubiquitination assays, genetic knockout with in vivo rescue; multiple orthogonal methods","pmids":["23630292"],"is_preprint":false},{"year":2014,"finding":"Rnd3 downregulation attenuates β2-adrenergic receptor (β2-AR) lysosomal targeting and ubiquitination, leading to elevated β2-AR protein levels and hyperactivation of PKA signaling. PKA activation destabilizes ryanodine receptor type 2 (RyR2) channels, causing severe Ca2+ leakage. Rnd3-null mouse embryos showed fetal arrhythmias; PKA inhibitor treatment curtailed irregular Ca2+ release.","method":"Rnd3 knockout mice, neonatal cardiomyocyte knockdown, β2-AR ubiquitination assays, PKA activity/cAMP measurements, Ca2+ imaging, PKA inhibitor rescue","journal":"Circulation research","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockout in vivo plus biochemical mechanism (ubiquitination, PKA activity) plus pharmacological rescue; multiple orthogonal methods","pmids":["25348166"],"is_preprint":false},{"year":2014,"finding":"Plexin B2 physically interacts with Rnd3 and competes with p190RhoGAP for Rnd3 binding, blocking Rnd3-mediated inhibition of RhoA. Plexin B2 also recruits RhoGEFs to directly stimulate RhoA activity. This antagonistic interaction determines the level of RhoA activity appropriate for cortical neuron migration in the embryonic cerebral cortex.","method":"Co-immunoprecipitation, in utero electroporation of cortical neurons, RhoA activity assays, competition binding assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, in vivo neuronal migration assays, competition binding; multiple orthogonal methods","pmids":["24572910"],"is_preprint":false},{"year":2014,"finding":"RhoE controls a key step in Notch1 signaling by mediating nuclear translocation of the activated Notch1 intracellular domain (N1IC) through interaction with importins. RhoE is itself a transcriptional target of activated Notch1. RhoE depletion renders primary keratinocytes resistant to Notch1-mediated differentiation. RhoE is essential for recruitment of N1IC to promoters of Notch1 target genes, establishing a regulatory feedback loop.","method":"Co-immunoprecipitation with importins, chromatin immunoprecipitation, siRNA knockdown, luciferase reporter assays, keratinocyte differentiation assays","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with importins, ChIP, functional differentiation assays; single lab","pmids":["24525741"],"is_preprint":false},{"year":2016,"finding":"RND3 physically interacted with Snail1 protein, enhanced Snail1 ubiquitination, and facilitated its proteasomal degradation. Forced RND3 expression inhibited Snail1 transcriptional activity, blocking glioblastoma cell migration and invasion. RND3 downregulation augmented Snail1 activity and decreased E-cadherin expression, promoting invasion; this was attenuated by Snail1 knockdown.","method":"Co-immunoprecipitation, ubiquitination assays, RND3 overexpression and knockdown, in vitro migration/invasion assays, in vivo GBM xenograft","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus ubiquitination assays plus epistasis (Snail1 KD rescue), single lab","pmids":["27705942"],"is_preprint":false},{"year":2016,"finding":"Rnd3 physically interacted with HIF1α and stabilized it, consequently promoting VEGFA expression and endothelial cell tube formation. In Rnd3 haploinsufficient mice, stressed hearts showed impaired angiogenesis and decreased HIF1α and VEGFA expression; this was partially rescued by CoCl2 (a HIF1α stabilizer), confirming Rnd3's role in stress-responsive angiogenesis through the HIF1α-VEGFA pathway.","method":"Co-immunoprecipitation, Rnd3 knockout/transgenic mice, transverse aortic constriction model, CoCl2 pharmacological rescue, angiogenesis assays","journal":"Hypertension","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus genetic mouse models with pharmacological rescue; single lab","pmids":["26781283"],"is_preprint":false},{"year":2019,"finding":"RhoE interacts with p65 and p50 NF-κB subunits individually in the cytosol, blocks their nuclear translocation, and also occupies the dimerization domain of p65 to disrupt p65/p50 heterodimerization. This was demonstrated by bimolecular fluorescence complementation, co-immunoprecipitation, and EMSA. Cardiac RhoE overexpression inhibited NF-κB activity, restrained post-MI inflammation, and improved cardiac function and survival.","method":"Bimolecular fluorescence complementation, co-immunoprecipitation, electrophoretic mobility shift assay (EMSA), genetic mouse models (cardiomyocyte-specific overexpression/haploinsufficiency), MI model","journal":"Circulation","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (BiFC, Co-IP, EMSA) plus in vivo genetic models with functional cardiac phenotypes","pmids":["30586715"],"is_preprint":false},{"year":2013,"finding":"In osteoclasts, RhoE is indispensable for migration and bone resorption by maintaining fast actin turnover in podosomes. RhoE activates the actin depolymerizing protein cofilin by inhibiting its ROCK-mediated phosphorylation. Primary RhoE-deficient osteoclasts showed dysfunctional sealing zones and impaired podosome patterning, establishing a RhoE-ROCK-cofilin pathway for podosome dynamics.","method":"Primary RhoE-deficient osteoclast isolation, bone resorption assays, actin turnover imaging, cofilin phosphorylation western blotting, ROCK inhibitor experiments","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — primary knockout cells with functional resorption assay plus biochemical pathway analysis; single lab","pmids":["24284899"],"is_preprint":false},{"year":2013,"finding":"Rnd3 silencing in embryonic cerebral cortex radial glial progenitors disrupts interkinetic nuclear migration, apical attachment, and orientation of cleavage plane through actin-dependent mechanisms. These defects were rescued by co-expression of constitutively active cofilin, demonstrating that Rnd3-mediated actin filament disassembly coordinates radial glial cell behavior. Additionally, Rnd3 limits basal progenitor divisions via suppression of cyclin D1 translation through a distinct actin-independent mechanism.","method":"In utero electroporation, constitutively active cofilin rescue, siRNA knockdown, cell cycle analysis, cyclin D1 translation assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo knockdown with direct genetic rescue (active cofilin), two distinct mechanistic pathways established","pmids":["23535656"],"is_preprint":false},{"year":2013,"finding":"RhoE is required for myoblast elongation and alignment before fusion. RhoE-deficient myoblasts show defective p190RhoGAP activation and failure to inhibit RhoA at the onset of fusion. RhoE also interacts with ROCK I, whose activity must be downregulated to allow fusion. Pharmacological inactivation of RhoA or ROCK restored myoblast fusion in RhoE-deficient cells, establishing RhoE's role upstream of p190RhoGAP-RhoA-ROCK I in myoblast fusion.","method":"RhoE siRNA knockdown in C2C12 cells, p190RhoGAP activity assay, RhoA activity assay, co-immunoprecipitation with ROCK I, pharmacological RhoA/ROCK inhibition rescue","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 2 / Strong — knockdown with pharmacological rescue, biochemical pathway activity assays, Co-IP; multiple orthogonal methods","pmids":["18369372"],"is_preprint":false},{"year":2005,"finding":"RhoE is farnesylated and localizes partly on membranes (including Golgi and plasma membrane) and in the cytosol. ROCK I-mediated phosphorylation reduces RhoE membrane association and correlates with its activity in inducing stress fiber disruption. RhoE also acts independently of ROCK to inhibit cell cycle progression, in part by preventing translation of cyclin D1.","method":"Farnesylation inhibitor treatment, subcellular fractionation, phospho-mutant analysis, ROCK inhibitor experiments, cyclin D1 translation assays","journal":"Biochemical Society transactions","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — review/methods paper but citing original experimental data; subcellular fractionation and functional assays","pmids":["16042565"],"is_preprint":false},{"year":2012,"finding":"RhoE-deficient neurons exhibit decreased neurite number and length, reduced axon outgrowth, and delayed neuronal polarization. These defects involve the RhoA/ROCK/LIMK/cofilin signaling pathway, as evidenced by altered cofilin phosphorylation in RhoE-null hippocampal neurons.","method":"RhoE knockout hippocampal neuron cultures, neurite morphology analysis, cofilin/LIMK phosphorylation western blotting","journal":"Journal of neurochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — primary knockout neurons with morphological and biochemical pathway readouts; single lab","pmids":["22428561"],"is_preprint":false},{"year":2003,"finding":"Rnd3 upregulation in mid-pregnant rabbit myometrium correlates with inhibition of RhoA-Rho kinase-mediated Ca2+ sensitization. Treatment with farnesyl-transferase inhibitor manumycin A (blocking Rnd3 membrane targeting) restored RhoA-Rho kinase-dependent Ca2+ sensitization in mid-pregnant myometrium, establishing Rnd3 farnesylation as mechanistically required for its inhibition of myometrial contractility.","method":"Differential gene expression screening (cDNA array), protein expression western blotting, permeabilized smooth muscle contractility assays, farnesyl-transferase inhibitor treatment","journal":"The Journal of physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional contractility assay with pharmacological inhibitor establishing mechanism; single lab","pmids":["14561824"],"is_preprint":false},{"year":2013,"finding":"The RhoE/ROCK/ARHGAP25 signaling pathway controls cell invasion: RhoE expression is low in alveolar rhabdomyosarcoma (ARMS), and its overexpression reduces invasion potential. ROCK (regulated by RhoE) activates ARHGAP25, a GAP for Rac, which is required downstream of ROCK II for ARMS cell invasion. This defines a RhoE→ROCK→ARHGAP25→Rac inhibition pathway promoting invasive potential.","method":"3D spheroid invasion assay, RhoE overexpression/knockdown, ROCK II inhibition, ARHGAP25 knockdown, Rac activity assay","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pathway epistasis established with multiple KD/KO approaches and Rac activity assay; single lab","pmids":["27413008"],"is_preprint":false},{"year":2016,"finding":"A RhoA-ROCK-Rnd3 feedback loop determines local sites of actin cortex reassembly during membrane blebbing. Live-cell imaging revealed that Eps8 and activated ezrin mark foci where local actin reassembly occurs in blebs, and this process is regulated by the RhoA-ROCK-Rnd3 circuit.","method":"Live-cell imaging of GFP-actin, fluorescent Eps8 and ezrin reporters, ROCK inhibitor treatment, Rnd3 manipulation","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — live-cell imaging with functional inhibitor experiments establishing feedback loop; single lab","pmids":["26976596"],"is_preprint":false},{"year":2012,"finding":"Rnd3 knockdown in HCC cells increased cell motility and invasiveness. Stable Rnd3 knockdown enhanced phosphorylation of myosin phosphatase targeting subunit (MYPT1), promoted stress fiber assembly, and increased plasma membrane blebbing, all consistent with activation of the Rho/ROCK pathway. In vivo, Rnd3 knockdown enhanced local invasion of HCC cells with increased venous invasion.","method":"Lentiviral shRNA knockdown, in vitro motility/invasion assays, MYPT1 phosphorylation western blot, orthotopic liver injection mouse model, histological analysis","journal":"Hepatology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function with biochemical pathway readouts and in vivo validation; single lab","pmids":["22829315"],"is_preprint":false},{"year":2013,"finding":"RhoE interacts with Skp2 (an F-box protein/E3 ubiquitin ligase component). RhoE protein levels are regulated by proteasomal degradation: RhoE accumulates in G1 and decreases at the G1/S transition, with a half-life shorter than other Rho proteins. The Skp2-interacting domain maps to amino acids 231-240 of RhoE, and Lys235 is the ubiquitylation substrate. Skp2 overexpression decreases both RhoE and p27 levels.","method":"Co-immunoprecipitation with Skp2, proteasome inhibitor treatment, protein half-life measurements, domain mapping with deletion mutants, Lys235 site-directed mutagenesis, flow cytometry cell cycle analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — Co-IP, mutagenesis identifying ubiquitylation site, functional cell cycle analysis; single lab with multiple orthogonal methods","pmids":["24045951"],"is_preprint":false},{"year":2012,"finding":"RhoE is regulated by cyclic AMP/PKA signaling in trophoblast cells: treatment with cAMP analogue dbcAMP strongly upregulated RhoE, and this was mediated through PKA (blocked by PKA-specific inhibitor PKI and mimicked by N6-phenyl-cAMP). RhoE silencing by RNAi significantly decreased dbcAMP-induced BeWo cell fusion without affecting differentiation markers.","method":"PKA-specific cAMP analogues, PKA inhibitor (14-22 amide), RNAi knockdown, fusion index quantification, HCG/PLAP differentiation markers","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological dissection of signaling pathway plus functional RNAi, single lab","pmids":["22272352"],"is_preprint":false},{"year":2016,"finding":"Rnd3 in endothelial cells acts through RhoB: Rnd3 overexpression increases RhoB expression, which is then required for Rnd3-induced stress fiber assembly (a response opposite to other cell types). Rnd3 does not act through known signaling partners (p190RhoGAP, ROCK, Syx) in endothelial cells and does not need membrane association to increase stress fibers.","method":"Rnd3 overexpression, RhoB knockdown, dominant-negative and constitutively active mutants, actin immunofluorescence, RhoB expression western blotting","journal":"Biology open","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistasis by RhoB knockdown establishing RhoB-dependence, negative results ruling out known partners; single lab","pmids":["23430146"],"is_preprint":false},{"year":2016,"finding":"Rnd3 interacts with plexin-B2 preferentially over plexin-B1 and -B3 (shown by immunoprecipitation). Plexin-B2 promotes Rnd3-induced cell rounding and loss of stress fibers, and enhances Rnd3-mediated inhibition of HeLa cell invasion. Specific amino acids in Rnd3 required for plexin-B2 interaction were identified; mutation of these residues prevents Rnd3-induced morphological changes.","method":"Co-immunoprecipitation, site-directed mutagenesis of Rnd3:plexin-B2 interface, cell rounding assays, invasion assays","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with mutagenesis and functional cell morphology/invasion assays; single lab","pmids":["27656111"],"is_preprint":false},{"year":2014,"finding":"Rnd3 downregulation in Rnd3 haploinsufficient mice leads to elevated ROCK kinase activity, remarkable apoptosis, and increased caspase-3 in hearts under pressure overload. Pharmacological ROCK inhibition (fasudil) partially improved cardiac function. Genetic deletion of ROCK1 in Rnd3 haploinsufficient mice (Rnd3+/-/ROCK1-/-) partially but not completely rescued heart failure, indicating ROCK1-dependent and -independent mechanisms for Rnd3-mediated cardiac protection.","method":"Haploinsufficient Rnd3+/- mice, transverse aortic constriction, ROCK1 double-knockout, fasudil pharmacological treatment, caspase-3 activity, cardiac function echocardiography","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with double knockout plus pharmacological rescue; single lab","pmids":["24901055"],"is_preprint":false},{"year":2018,"finding":"Restoration of Rnd3 levels in IPF fibroblasts increases p190RhoGAP activity and decreases RhoA activity, reducing the fibrotic phenotype. IPF drugs nintedanib and pirfenidone decrease RhoA activity and fibrotic phenotype by upregulating Rnd3 expression and p190RhoGAP activity, establishing a Rnd3→p190RhoGAP→RhoA pathway in IPF.","method":"Rnd3 re-expression in IPF fibroblasts, p190RhoGAP activity assay, RhoA activity assay, pharmacological drug treatment, fibrosis phenotype assays","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pathway activity assays with Rnd3 restoration and drug treatment; single lab","pmids":["29995590"],"is_preprint":false},{"year":2021,"finding":"Rnd3 physically interacts with PPARγ and promotes the PPARγ-UCP2 signaling cascade. Loss of Rnd3 in trophoblasts leads to excessive ROS, mitochondrial injury, and proton leakage; forced expression of PPARγ rescues Rnd3 deficiency-mediated mitochondrial dysfunction. This defines a Rnd3-PPARγ-UCP2 pathway regulating placental mitochondrial ROS.","method":"Co-immunoprecipitation, ROS/mitochondrial function assays, Rnd3 overexpression/knockdown in primary PE trophoblasts, PPARγ overexpression rescue","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus functional rescue with PPARγ; single lab","pmids":["34046947"],"is_preprint":false},{"year":2023,"finding":"Rnd3 directly interacts with the ring finger domain of TRAF6, suppresses K63-linked TRAF6 ubiquitination, and promotes K48-linked TRAF6 ubiquitination, thereby inhibiting NF-κB activation and promoting TRAF6 degradation. This was established by LC-MS/MS, Co-IP, and molecular docking. TRAF6 knockdown countered Rnd3 knockout-induced EC pyroptosis in vivo and in vitro.","method":"LC-MS/MS, co-immunoprecipitation, molecular docking, K63/K48 ubiquitination assays, endothelium-specific Rnd3 transgenic/knockout mice, TRAF6 knockdown rescue","journal":"Clinical and translational medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, mass spectrometry identification, ubiquitination type specificity assays with genetic rescue; single lab","pmids":["37743632"],"is_preprint":false},{"year":2025,"finding":"Rnd3 directly binds ROCK1 in the cytoplasm and inhibits ROCK1-induced Drp1 phosphorylation at Ser616, thereby inhibiting mitochondrial fission and PANoptosis (apoptosis, pyroptosis, necroptosis) in doxorubicin-induced cardiotoxicity. ROCK1 knockdown nullified the cardioprotective effects of Rnd3. This was established by co-immunoprecipitation, protein-protein docking, and cardiomyocyte-specific transgenic/knockout models.","method":"Co-immunoprecipitation, protein-protein molecular docking, Drp1 Ser616 phosphorylation assays, cardiomyocyte-specific Rnd3-Tg and Rnd3LSP/LSP mice, ROCK1 siRNA knockdown","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus docking plus genetic models with epistatic ROCK1 KD; single lab","pmids":["39755713"],"is_preprint":false},{"year":2022,"finding":"In cardiac fibroblasts, Rnd3 regulates Notch signaling by interacting with NICD and regulates TGF-β signaling by interacting with ROCK1. Fibroblast-specific Rnd3 overexpression suppressed Notch and TGF-β signaling, attenuated cardiac oxidative stress and fibrosis. Glucotoxicity and lipotoxicity control Rnd3 expression by regulating binding of nuclear receptor Nr1H2 to the Rnd3 promoter (established by ChIP).","method":"Co-immunoprecipitation (NICD and ROCK1), RNA sequencing, ChIP assay (Nr1H2 binding to Rnd3 promoter), fibroblast-specific Rnd3 knockout and transgenic mice, in vitro fibroblast assays","journal":"Theranostics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus ChIP plus genetic mouse models; single lab","pmids":["36438502"],"is_preprint":false},{"year":2019,"finding":"RND3 knockdown in primary human adipocytes reduces cAMP- and isoproterenol-induced lipolysis, partly explained by reduced protein expression of ATGL and phosphorylated HSL. This effect was mimicked by ROCK inhibitor treatment, placing RND3 upstream of ROCK in the lipolysis regulatory pathway.","method":"siRNA knockdown in primary human adipocytes, lipolysis assays, ATGL/HSL western blotting, ROCK inhibitor phenocopy","journal":"Metabolism: clinical and experimental","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function in primary cells with biochemical pathway readouts and pharmacological phenocopy; single lab","pmids":["31672447"],"is_preprint":false},{"year":2008,"finding":"RhoE is required for keratinocyte differentiation and stratification. RhoE protein levels are specifically and transiently upregulated upon keratinocyte differentiation, and this upregulation requires ROCK I activity. RhoE overexpression caused cell enlargement and increased stratification; RhoE depletion induced hyperproliferation and delayed differentiation initiation. RhoE negatively modulates integrin adhesion in basal cells to facilitate detachment for suprabasal migration.","method":"siRNA depletion, adenoviral overexpression, 3D organotypic stratification model, BrdU proliferation assay, integrin adhesion assays, western blotting for differentiation markers","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function and gain-of-function with differentiation model and multiple functional readouts; single lab","pmids":["18923151"],"is_preprint":false},{"year":2007,"finding":"Mutant B-RAF (V600E) maintains Rnd3 expression via the MEK/ERK1/2 pathway in melanoma cells. B-RAF knockdown or MEK inhibition attenuated Rnd3 expression and elevated RhoA/ROCK/LIMK-2 signaling, increasing cofilin phosphorylation and stress fiber formation. Constitutive Rnd3 expression suppressed the actin and focal adhesion effects of B-RAF knockdown, placing Rnd3 as a cross-talk regulator between RAF/MEK/ERK and Rho/ROCK signaling pathways.","method":"siRNA knockdown of B-RAF, MEK pharmacological inhibition, constitutive Rnd3 expression rescue, cofilin/LIMK-2 phosphorylation western blotting, focal adhesion imaging","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pathway epistasis with knockdown and pharmacological inhibitors plus genetic rescue; single lab","pmids":["18045987"],"is_preprint":false},{"year":2009,"finding":"RhoE induces neurite-like outgrowth in PC12 cells in the absence of NGF, acting through inhibition of the RhoA/ROCK I signaling pathway. RhoE overexpression decreased RhoA activity and reduced ROCK I and phospho-MLCP expression. Overexpression of active RhoA or ROCK I abolished RhoE-promoted neurite outgrowth. RhoE siRNA knockdown reduced NGF-induced neurite formation, and Rac/Cdc42 also contribute to RhoE-induced neurite outgrowth.","method":"RhoE overexpression, dominant-active RhoA/ROCK I rescue, siRNA knockdown, RhoA activity assay, MLCP phosphorylation western blot, neurite measurement","journal":"Journal of neurochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with active RhoA/ROCK1 rescue plus knockdown; single lab","pmids":["19968760"],"is_preprint":false},{"year":2024,"finding":"KIAA1429 (m6A methyltransferase component) negatively regulates RND3 mRNA stability in coordination with the m6A reader YTHDC1. KIAA1429 mediates m6A modification of RND3 mRNA via its RNA binding domain. RNA stability assays, RIP, and MeRIP-qPCR established that increased m6A modification leads to decreased RND3 mRNA stability and expression.","method":"RNA stability assays, RNA immunoprecipitation (RIP), MeRIP-qPCR, luciferase assay, KIAA1429 and YTHDC1 knockdown/overexpression","journal":"Cancer letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal RNA biology methods establishing m6A-dependent mRNA degradation mechanism; single lab","pmids":["38224863"],"is_preprint":false}],"current_model":"RND3/RhoE is a constitutively GTP-bound, GTPase-deficient Rho family protein that inhibits RhoA signaling primarily by directly binding and inhibiting ROCK I (not ROCK II) at its kinase domain N-terminus, preventing phosphorylation of myosin light chain phosphatase and thereby promoting actin stress fiber disassembly; its activity is regulated post-translationally by ROCK I-mediated phosphorylation (at Ser11 and other sites, increasing stability and cytosolic localization), PKCα-mediated phosphorylation (altering membrane targeting), Skp2-mediated proteasomal degradation, and transcriptionally by p53, HIF-1α, and Notch1; beyond ROCK I inhibition, RND3 exerts ROCK-independent anti-proliferative effects by blocking 4E-BP1 phosphorylation to inhibit cap-dependent translation of cyclin D1 and c-Myc, promotes NICD/Snail1 ubiquitination and degradation to suppress Notch signaling and cell migration, interacts with p65/p50 NF-κB subunits to block nuclear translocation, stabilizes HIF1α to promote angiogenesis, interacts with importins to facilitate Notch1 nuclear translocation in a feedback loop, and activates p190RhoGAP by targeting it to lipid rafts via its N-terminal KERRA sequence."},"narrative":{"mechanistic_narrative":"RND3/RhoE is an atypical Rho-family protein that, unlike classical Rho GTPases, is constitutively GTP-bound and GTPase-deficient, acting as a negative regulator of RhoA-ROCK signaling to drive actin stress fiber disassembly and remodel cell shape, migration, and survival [PMID:9671486, PMID:12009891]. Its constitutive GTP-bound state arises from substitution of the catalytic glutamine and switch-II serines that prevent GTP hydrolysis [PMID:12009891]. The central effector mechanism is direct binding to ROCK I (but not ROCK II), engaging the kinase domain N-terminal region at a site distinct from the RhoA-binding site to block phosphorylation of myosin light chain phosphatase and disassemble stress fibers [PMID:12773565]; structural and domain-mapping work defined a bipartite interaction in which an effector-region contact mediates inhibition while a separate C-lobe αG-helix contact positions RND3 for multi-site phosphorylation by ROCK I, and N-terminal ROCK I dimerization is required for binding [PMID:18946488, PMID:18215121]. RND3 also activates p190RhoGAP by targeting it to lipid rafts via its N-terminal KERRA sequence, providing a parallel route to RhoA suppression [PMID:22357615]. Beyond ROCK inhibition, RND3 exerts ROCK-independent anti-proliferative effects by blocking mTOR-independent 4E-BP1 phosphorylation, thereby restraining cap-dependent translation of cyclin D1 and c-Myc and inhibiting cell-cycle progression and Ras/Raf-induced transformation [PMID:15340047, PMID:19850923]. RND3 additionally functions as a scaffold for protein turnover and transcriptional control: it promotes ubiquitination and degradation of the Notch intracellular domain and of Snail1 to suppress Notch signaling and migration [PMID:23630292, PMID:27705942], and sequesters NF-κB p65/p50 subunits in the cytosol to block their nuclear translocation and dimerization [PMID:30586715]. RND3 activity is tightly regulated post-translationally—by ROCK I phosphorylation at Ser11 that enhances stability and cytosolic localization [PMID:15775972], PKCα phosphorylation that redirects membrane targeting [PMID:19723022], farnesylation-dependent membrane association [PMID:14561824], and Skp2-mediated proteasomal degradation at Lys235 [PMID:24045951]—and transcriptionally by p53 under genotoxic stress, where RND3 inhibits ROCK I-mediated apoptosis to promote survival [PMID:17174923]. Through these activities RND3 governs diverse physiological processes including keratinocyte differentiation, cortical neuron migration, myoblast fusion, osteoclast podosome dynamics, and cardiac stress responses [PMID:23630292, PMID:24572910, PMID:24284899, PMID:18369372, PMID:18923151]; in mice, Rnd3 deletion causes hydrocephalus via enhanced Notch signaling [PMID:23630292].","teleology":[{"year":1998,"claim":"Established that RhoE is an atypical Rho protein that is constitutively GTP-bound rather than cycling, and that it antagonizes RhoA by disassembling stress fibers and increasing migration—inverting the canonical Rho phenotype.","evidence":"Biochemical GTP/GDP binding and GTPase assays plus microinjection and migration readouts in macrophages and MDCK cells","pmids":["9671486"],"confidence":"High","gaps":["Did not identify the direct molecular target through which RhoE antagonizes RhoA","Mechanism of constitutive GTP-loading not yet structurally explained"]},{"year":2002,"claim":"Provided the structural basis for the constitutive GTP-bound state, answering why RND3 cannot hydrolyze GTP.","evidence":"X-ray crystallography of the RhoE G-domain bound to GTP/Mg2+ at 2.1 Å","pmids":["12009891"],"confidence":"High","gaps":["Structure of the core domain alone does not reveal effector engagement","Does not address regulation by phosphorylation or localization"]},{"year":2003,"claim":"Identified ROCK I as the direct effector target, defining the central molecular mechanism by which RhoE inhibits RhoA-driven contractility.","evidence":"Reciprocal co-IP of endogenous proteins, colocalization on trans-Golgi, and ROCK I activity readouts (MLC phosphatase phosphorylation, stress fibers)","pmids":["12773565"],"confidence":"High","gaps":["Did not resolve the structural binding interface","Selectivity for ROCK I over ROCK II mechanistically unexplained at the time"]},{"year":2004,"claim":"Demonstrated a ROCK-independent anti-proliferative function, showing RhoE blocks cell-cycle progression at the pRb checkpoint without altering canonical mitogenic kinases.","evidence":"Inducible RhoE expression with BrdU/flow cytometry, cyclin D1/p21 blotting, and E7/E1A/cyclin E epistatic rescue","pmids":["15340047"],"confidence":"High","gaps":["The molecular target mediating cyclin D1 loss was not identified","Distinction from ROCK pathway left mechanistically incomplete"]},{"year":2005,"claim":"Established phosphoregulation of RhoE, showing ROCK I phosphorylates RhoE at Ser11 to increase stability and shift it to the cytosol, creating a feedback layer on its own inhibitory activity.","evidence":"In vitro kinase assays, phospho-specific antibodies, fractionation, and PDGF/PKC stimulation in cells","pmids":["15775972","16042565"],"confidence":"High","gaps":["Number and identity of all phosphosites beyond Ser11 not fully resolved","Functional consequence of each individual site not separated"]},{"year":2008,"claim":"Resolved the RhoE:ROCK I structure and showed inhibition and phosphorylation occur through distinct contacts, while PDK1 competition and ROCK I dimerization gate the interaction.","evidence":"Co-crystal structure with mutagenesis, plus siRNA depletion and binding competition assays","pmids":["18946488","18215121","18204440"],"confidence":"High","gaps":["The effector-region partner mediating actin disassembly was not identified","How phosphorylation feeds back onto the structural interface in vivo not fully defined"]},{"year":2009,"claim":"Identified the molecular basis of RhoE's ROCK-independent growth inhibition as mTOR-independent blockade of 4E-BP1 phosphorylation, restraining cap-dependent translation of cyclin D1 and c-Myc.","evidence":"Cap pull-down, 4E-BP1/eIF4E interaction blots, mTOR/Raptor co-IP, and eIF4E genetic rescue of transformation","pmids":["19850923"],"confidence":"High","gaps":["The proximal RhoE target upstream of 4E-BP1 was not identified","Connection to the constitutive GTP-bound state unclear"]},{"year":2009,"claim":"Showed PKCα directly phosphorylates Rnd3 to control its internal-membrane localization and ROCK-pathway inhibitory capacity, adding a second kinase regulatory input.","evidence":"In vitro PKCα kinase assay, PKCα-null cells, and non-phosphorylatable mutant with fractionation","pmids":["19723022"],"confidence":"High","gaps":["PKCα phosphosites not precisely mapped relative to ROCK I sites","Interplay between PKCα and ROCK I phosphorylation unresolved"]},{"year":2012,"claim":"Explained Rnd-family functional specificity in RhoA inhibition by identifying the N-terminal KERRA lipid-raft targeting sequence required for p190RhoGAP activation.","evidence":"N-terminal mutation analysis, lipid raft fractionation, and p190RhoGAP activity assays","pmids":["22357615"],"confidence":"Medium","gaps":["Single-lab domain mapping not independently confirmed","How raft localization couples mechanistically to GAP activation not detailed"]},{"year":2013,"claim":"Established RND3 as a degradation scaffold in Notch signaling, promoting NICD ubiquitination via FBW7 to suppress Notch transcription, with in vivo loss causing hydrocephalus.","evidence":"Reciprocal co-IP, ubiquitination assays, knockout mice with pharmacological Notch-inhibition rescue","pmids":["23630292"],"confidence":"High","gaps":["How a GTPase-fold protein scaffolds the ubiquitin machinery structurally unknown","Relationship to RhoE's actin-regulating function unclear"]},{"year":2013,"claim":"Defined RhoE as the upstream regulator of a ROCK-cofilin axis controlling actin turnover across cell types, integrating its function into tissue-level processes.","evidence":"Primary knockout/knockdown cells (osteoclasts, radial glia, myoblasts) with cofilin readouts and active-cofilin or RhoA/ROCK inhibitor rescue","pmids":["24284899","23535656","18369372"],"confidence":"High","gaps":["Tissue-specific differences in RhoE output not mechanistically reconciled","Quantitative thresholds of RhoA inhibition needed in each context undefined"]},{"year":2014,"claim":"Expanded RhoE's regulatory roles to membrane-receptor turnover and migration control, showing it routes β2-AR to lysosomal degradation and degrades Snail1, while plexin-B2 antagonizes its RhoA-inhibitory function.","evidence":"Knockout mice, ubiquitination assays, in utero electroporation, competition binding, and co-IP","pmids":["25348166","27705942","24572910","24525741"],"confidence":"Medium","gaps":["Whether RhoE acts catalytically or stoichiometrically in degradation pathways unresolved","Some interactions rest on single-lab co-IP"]},{"year":2019,"claim":"Established a transcription-factor sequestration mechanism, with RhoE binding p65/p50 to block NF-κB nuclear translocation and heterodimerization, defining a cardioprotective anti-inflammatory role.","evidence":"BiFC, co-IP, EMSA, and cardiomyocyte-specific genetic models in a myocardial infarction setting","pmids":["30586715"],"confidence":"High","gaps":["Structural basis of p65 dimerization-domain occupancy not solved","Relationship to RhoE's GTP-bound conformation unknown"]},{"year":2023,"claim":"Extended RhoE's ubiquitin-editing activity to TRAF6, showing it shifts TRAF6 from K63- to K48-linked ubiquitination to suppress NF-κB and endothelial pyroptosis.","evidence":"LC-MS/MS, co-IP, molecular docking, linkage-specific ubiquitination assays, and endothelial Rnd3 mouse models with TRAF6-knockdown rescue","pmids":["37743632"],"confidence":"Medium","gaps":["Direct enzymatic versus scaffolding role in ubiquitin-linkage switching not distinguished","Single-lab finding awaiting independent confirmation"]},{"year":null,"claim":"How RND3's single constitutively GTP-bound G-domain mechanistically partitions among its many divergent outputs—ROCK I inhibition, translational control, ubiquitin-mediated degradation of NICD/Snail1/TRAF6, and transcription-factor sequestration—remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model explains how one G-domain scaffolds ubiquitin ligases versus binding ROCK I","The branch point determining ROCK-dependent versus ROCK-independent outputs in a given cell is undefined","Whether degradation-promoting interactions require the effector loop or distinct surfaces is unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003924","term_label":"GTPase activity","supporting_discovery_ids":[1,2]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,4,12,21]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[0,13]},{"term_id":"GO:0140313","term_label":"molecular sequestering activity","supporting_discovery_ids":[21]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[3,25,39]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[1,5,25]},{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[0,25]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,7,13]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[6,12,31]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[15,31,38]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[9,38,39]}],"complexes":[],"partners":["ROCK1","PDK1","SKP2","NICD","SNAIL1","RELA","TRAF6","PLXNB2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P61587","full_name":"Rho-related GTP-binding protein RhoE","aliases":["Protein MemB","Rho family GTPase 3","Rho-related GTP-binding protein Rho8","Rnd3"],"length_aa":244,"mass_kda":27.4,"function":"Binds GTP but lacks intrinsic GTPase activity and is resistant to Rho-specific GTPase-activating proteins","subcellular_location":"Golgi apparatus membrane","url":"https://www.uniprot.org/uniprotkb/P61587/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/RND3","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000115963","cell_line_id":"CID000588","localizations":[{"compartment":"cytoplasmic","grade":3},{"compartment":"membrane","grade":2}],"interactors":[{"gene":"ANGPT1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID000588","total_profiled":1310},"omim":[{"mim_id":"609151","title":"UBX DOMAIN PROTEIN 11; UBXN11","url":"https://www.omim.org/entry/609151"},{"mim_id":"605213","title":"3-@PHOSPHOINOSITIDE-DEPENDENT PROTEIN KINASE 1; PDPK1","url":"https://www.omim.org/entry/605213"},{"mim_id":"602924","title":"RHO FAMILY GTPase 3; RND3","url":"https://www.omim.org/entry/602924"},{"mim_id":"601702","title":"RHO-ASSOCIATED COILED-COIL-CONTAINING PROTEIN KINASE 1; ROCK1","url":"https://www.omim.org/entry/601702"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"esophagus","ntpm":146.1}],"url":"https://www.proteinatlas.org/search/RND3"},"hgnc":{"alias_symbol":["RhoE","Rho8"],"prev_symbol":["ARHE"]},"alphafold":{"accession":"P61587","domains":[{"cath_id":"3.40.50.300","chopping":"21-201","consensus_level":"high","plddt":96.0415,"start":21,"end":201}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P61587","model_url":"https://alphafold.ebi.ac.uk/files/AF-P61587-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P61587-F1-predicted_aligned_error_v6.png","plddt_mean":81.75},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=RND3","jax_strain_url":"https://www.jax.org/strain/search?query=RND3"},"sequence":{"accession":"P61587","fasta_url":"https://rest.uniprot.org/uniprotkb/P61587.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P61587/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P61587"}},"corpus_meta":[{"pmid":"12773565","id":"PMC_12773565","title":"RhoE 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This interaction was confirmed by co-immunoprecipitation of endogenous proteins, and RhoE and ROCK I co-localized on the trans-Golgi network. RhoE overexpression inhibited ROCK I-induced stress fiber formation and phosphorylation of myosin light chain phosphatase, demonstrating that RhoE induces stress fiber disassembly by directly binding and inhibiting ROCK I.\",\n      \"method\": \"Co-immunoprecipitation of endogenous proteins, colocalization imaging, overexpression with ROCK I activity readouts (MLC phosphatase phosphorylation, stress fiber formation)\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP of endogenous proteins, colocalization, functional readouts; independently replicated across multiple subsequent studies\",\n      \"pmids\": [\"12773565\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"RhoE (mouse) binds GTP but does not detectably bind GDP and has low intrinsic GTPase activity. Microinjection of RhoE in macrophages and MDCK cells induced actin reorganization and complete disappearance of stress fibers, while RhoE localized to lateral membranes of MDCK cells. RhoE increased migration speed of HGF-stimulated MDCK cells, in contrast to RhoA inhibition of migration.\",\n      \"method\": \"Biochemical GTP/GDP binding assays, GTPase activity assays, microinjection, immunofluorescence, migration assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — direct biochemical assays plus live-cell functional readouts; foundational paper replicated by many subsequent studies\",\n      \"pmids\": [\"9671486\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Crystal structure of RhoE/Rnd3 core G-protein domain in complex with GTP and Mg2+ at 2.1 Å resolution revealed that serines at positions equivalent to Ala59 and Gln61 in Ras account for the lack of GTP hydrolysis: the absent conserved glutamine raises the transition state energy, and the serines stabilize the GTP-bound switch II conformation and may prevent catalytic water positioning.\",\n      \"method\": \"X-ray crystallography at 2.1 Å resolution\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure with structural mechanistic explanation for constitutive GTP-bound state\",\n      \"pmids\": [\"12009891\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"ROCK I phosphorylates RhoE on multiple residues in vitro. In cells, ROCK I-phosphorylated RhoE localizes to the cytosol whereas unphosphorylated RhoE is membrane-associated. Phosphorylation does not affect RhoE binding to ROCK I but increases RhoE protein stability. Using phospho-specific antibodies, ROCK I was shown to phosphorylate endogenous RhoE at serine 11 upon PDGF stimulation, and this phosphorylation requires active PKC signaling. Phosphorylation correlates with RhoE's ability to induce stress fiber disruption and inhibit Ras-induced transformation.\",\n      \"method\": \"In vitro kinase assay, phospho-specific antibodies, subcellular fractionation, cell stimulation assays, protein stability measurements\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vitro kinase assay plus phospho-specific antibody validation in cells with multiple orthogonal readouts\",\n      \"pmids\": [\"15775972\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Crystal structure of RhoE in complex with the ROCK I kinase domain at high resolution revealed that RhoE interacts with the C-lobe αG helix of ROCK I via a novel binding site remote from its effector region, positioning its N and C termini proximal to the ROCK I catalytic site to enable multi-site phosphorylation. Disruption of the ROCK I:RhoE interface abolished RhoE phosphorylation but had no effect on RhoE-mediated stress fiber disassembly. Mutation of the RhoE effector region attenuated actin cytoskeleton disruption, indicating RhoE exerts inhibitory effects on ROCK I through protein(s) binding its effector region.\",\n      \"method\": \"X-ray crystallography, site-directed mutagenesis, functional actin cytoskeleton assays\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure plus mutagenesis with functional validation in cells\",\n      \"pmids\": [\"18946488\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"PDK1 competes directly with RhoE for binding to ROCK1 at the plasma membrane in a non-catalytic manner. In the absence of PDK1, negative regulation by RhoE predominates, causing reduced acto-myosin contractility and motility. PDK1 depletion alters ROCK1 localization and reduces its ability to drive cortical acto-myosin contraction.\",\n      \"method\": \"siRNA depletion, direct binding competition assays, localization imaging, MLC phosphorylation readouts, in vivo motility assays\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct binding competition demonstrated, multiple orthogonal methods, published in high-impact journal\",\n      \"pmids\": [\"18204440\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"RhoE expression inhibits cell cycle progression and serum-induced S-phase entry. RhoE-expressing cells failed to accumulate cyclin D1 or p21(cip1) protein or activate E2F-regulated genes despite normal ERK, PI3K/Akt, FAK, and Rac activation. Expression of proteins bypassing the pRb checkpoint (HPV E7, adenovirus E1A, cyclin E) rescued cell cycle progression. RhoE also inhibited Ras- and Raf-induced fibroblast transformation. Neither ROCK nor RhoA inhibition accounted for the cell cycle response.\",\n      \"method\": \"Inducible RhoE expression system, BrdU/flow cytometry cell cycle analysis, western blotting for cyclin D1/p21/Rb, epistasis with E7/E1A/cyclin E rescue\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — inducible expression system with genetic epistasis experiments and multiple orthogonal readouts\",\n      \"pmids\": [\"15340047\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Raf activation downstream of oncogenic Ras induces expression of Rnd3 (via the MEK/ERK pathway), which acts as an endogenous inhibitor of Rho function to cause loss of actin stress fibers without reducing Rho-GTP levels. Expression of Rnd3 alone at levels equivalent to Raf transformation caused substantial loss of actin stress fibers. Pharmacological MEK inhibition prevented Rnd3 induction and preserved stress fibers.\",\n      \"method\": \"Conditional Raf activation, Rho pull-down GTP-loading assay, Rnd3 overexpression, MEK inhibitor treatment, actin immunofluorescence\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — inducible oncogene system, pathway inhibitors, direct expression measurement with functional readouts\",\n      \"pmids\": [\"11094087\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"A novel Staphylococcus aureus C3-like ADP-ribosyltransferase (C3Stau) modifies RhoE and Rnd3 by ADP-ribosylation at Asn-44 (equivalent to Asn-41 in RhoA), in addition to RhoA. This was confirmed in vitro with recombinant proteins and in vivo in Xenopus laevis oocytes expressing RhoE.\",\n      \"method\": \"In vitro ADP-ribosylation assay with recombinant proteins, in vivo modification in Xenopus oocytes, cloning of C3Stau from genomic DNA\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro biochemical assay plus in vivo validation in Xenopus; single lab but two orthogonal systems\",\n      \"pmids\": [\"11124969\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"RhoE is a transcriptional target of p53. Genotoxic stress triggers p53-dependent RhoE induction, which causes actin stress fiber disassembly. RhoE inhibits ROCK I activity during genotoxic stress and thereby suppresses apoptosis. Silencing of RhoE induction in response to genotoxic stress increased apoptosis, indicating RhoE promotes cell survival by inhibiting ROCK I-mediated apoptosis.\",\n      \"method\": \"siRNA knockdown, luciferase reporter assays for p53-dependent RhoE transcription, ROCK I activity assays, apoptosis measurements, stress fiber immunofluorescence\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — transcriptional target validated by reporter assay, functional rescue experiments, multiple orthogonal methods\",\n      \"pmids\": [\"17174923\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"PKCα directly phosphorylates Rnd3 in vitro and in cells (upon PKC agonist stimulation). PKCα-mediated phosphorylation causes an electrophoretic mobility shift and enrichment of Rnd3 at internal membranes. This does not occur in PKCα-null cells or with a non-phosphorylatable Rnd3 mutant. PKCα phosphorylation affects Rnd3's ability to block Rho-ROCK pathway signaling.\",\n      \"method\": \"In vitro kinase assay with PKCα, PKCα-null cells, non-phosphorylatable Rnd3 mutant, subcellular fractionation, ROCK pathway readouts\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro kinase assay plus genetic null cells plus phosphorylation-defective mutant; multiple orthogonal methods in single lab\",\n      \"pmids\": [\"19723022\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"N-terminus-mediated dimerization of ROCK I is required for RhoE binding. The central coiled-coil domain can dimerize ROCK I but is insufficient without the N-terminus to allow RhoE binding. ROCK I kinase activity is required for N-terminal dimerization and RhoE binding, although inclusion of part of the coiled-coil domain can compensate for lack of kinase activity. N-terminus-mediated dimerization is also required for ROCK I to induce stellate actin stress fibers in cells.\",\n      \"method\": \"ROCK I domain deletion mutants, dimerization assays, RhoE binding assays, kinase-dead mutants, actin stress fiber formation assays in cells\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain mapping with multiple mutants and functional readouts, single lab\",\n      \"pmids\": [\"18215121\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"RhoE inhibits phosphorylation of the translational repressor 4E-BP1 in response to extracellular stimuli independently of mTOR (S6K phosphorylation, mTOR/Raptor association unaffected by RhoE). RhoE prevents release of eIF4E from 4E-BP1, thereby inhibiting cap-dependent translation. This mechanism explains RhoE-mediated inhibition of cyclin D1 translation and c-Myc expression. eIF4E overexpression rescued cell cycle progression and Ras-induced transformation in RhoE-expressing cells.\",\n      \"method\": \"Western blotting for 4E-BP1/eIF4E interaction (cap pull-down), S6K phosphorylation, mTOR/Raptor co-IP, eIF4E rescue experiments, transformation assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal biochemical assays establishing mTOR-independent 4E-BP1 regulation with eIF4E genetic rescue\",\n      \"pmids\": [\"19850923\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Rnd1 and Rnd3, but not Rnd2, contain a KERRA sequence in their N-terminus that functions as a lipid raft-targeting determinant. Lipid raft targeting is required for p190 RhoGAP activation by Rnd1 and Rnd3. This mechanism accounts for the functional difference between Rnd proteins in RhoA inhibition signaling despite all three Rnd proteins binding p190 RhoGAP equally in vitro.\",\n      \"method\": \"N-terminal deletion/mutation analysis, lipid raft fractionation, p190 RhoGAP activity assay\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain mapping with fractionation and functional GAP activity assay, single lab\",\n      \"pmids\": [\"22357615\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Rnd3 binds to the RhoA GEF Syx (synectin-binding RhoA exchange factor) identified by unbiased two-step affinity purification and mass spectrometry. The Syx interaction with Rnd3 occurs through a region similar to the Raf1 Ras-binding domain (RBD), not via the Syx DH domain. Rnd3 negatively regulates Syx activity in vivo, as shown by zebrafish morpholino knockdown rescue experiments where a Rnd3-binding defective Syx mutant (E164A/R165D) was more potent at rescuing embryonic defects than wild-type Syx.\",\n      \"method\": \"Affinity purification/mass spectrometry, domain mutation binding assays, zebrafish morpholino knockdown, mRNA rescue with wild-type vs. Rnd3-binding mutant\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — unbiased mass spectrometry identification with in vivo genetic rescue validation, single lab\",\n      \"pmids\": [\"20811643\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Rnd3 interacts physically with the Notch intracellular domain (NICD), promotes NICD ubiquitination, and facilitates protein degradation of NICD, CSL, and MAML1 (components of the Notch transcriptional complex). Rnd3 facilitates binding of NICD to FBW7 (ubiquitin ligase) to enhance NICD degradation, thereby inhibiting Notch transcriptional activity. In mice, Rnd3 genetic deletion caused hydrocephalus through decreased NICD protein degradation and enhanced Notch signaling, which was rescued by Notch inhibition.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assays, siRNA knockdown, genetic knockout mice, pharmacological Notch inhibition rescue\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, ubiquitination assays, genetic knockout with in vivo rescue; multiple orthogonal methods\",\n      \"pmids\": [\"23630292\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Rnd3 downregulation attenuates β2-adrenergic receptor (β2-AR) lysosomal targeting and ubiquitination, leading to elevated β2-AR protein levels and hyperactivation of PKA signaling. PKA activation destabilizes ryanodine receptor type 2 (RyR2) channels, causing severe Ca2+ leakage. Rnd3-null mouse embryos showed fetal arrhythmias; PKA inhibitor treatment curtailed irregular Ca2+ release.\",\n      \"method\": \"Rnd3 knockout mice, neonatal cardiomyocyte knockdown, β2-AR ubiquitination assays, PKA activity/cAMP measurements, Ca2+ imaging, PKA inhibitor rescue\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockout in vivo plus biochemical mechanism (ubiquitination, PKA activity) plus pharmacological rescue; multiple orthogonal methods\",\n      \"pmids\": [\"25348166\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Plexin B2 physically interacts with Rnd3 and competes with p190RhoGAP for Rnd3 binding, blocking Rnd3-mediated inhibition of RhoA. Plexin B2 also recruits RhoGEFs to directly stimulate RhoA activity. This antagonistic interaction determines the level of RhoA activity appropriate for cortical neuron migration in the embryonic cerebral cortex.\",\n      \"method\": \"Co-immunoprecipitation, in utero electroporation of cortical neurons, RhoA activity assays, competition binding assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, in vivo neuronal migration assays, competition binding; multiple orthogonal methods\",\n      \"pmids\": [\"24572910\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"RhoE controls a key step in Notch1 signaling by mediating nuclear translocation of the activated Notch1 intracellular domain (N1IC) through interaction with importins. RhoE is itself a transcriptional target of activated Notch1. RhoE depletion renders primary keratinocytes resistant to Notch1-mediated differentiation. RhoE is essential for recruitment of N1IC to promoters of Notch1 target genes, establishing a regulatory feedback loop.\",\n      \"method\": \"Co-immunoprecipitation with importins, chromatin immunoprecipitation, siRNA knockdown, luciferase reporter assays, keratinocyte differentiation assays\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with importins, ChIP, functional differentiation assays; single lab\",\n      \"pmids\": [\"24525741\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"RND3 physically interacted with Snail1 protein, enhanced Snail1 ubiquitination, and facilitated its proteasomal degradation. Forced RND3 expression inhibited Snail1 transcriptional activity, blocking glioblastoma cell migration and invasion. RND3 downregulation augmented Snail1 activity and decreased E-cadherin expression, promoting invasion; this was attenuated by Snail1 knockdown.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assays, RND3 overexpression and knockdown, in vitro migration/invasion assays, in vivo GBM xenograft\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus ubiquitination assays plus epistasis (Snail1 KD rescue), single lab\",\n      \"pmids\": [\"27705942\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Rnd3 physically interacted with HIF1α and stabilized it, consequently promoting VEGFA expression and endothelial cell tube formation. In Rnd3 haploinsufficient mice, stressed hearts showed impaired angiogenesis and decreased HIF1α and VEGFA expression; this was partially rescued by CoCl2 (a HIF1α stabilizer), confirming Rnd3's role in stress-responsive angiogenesis through the HIF1α-VEGFA pathway.\",\n      \"method\": \"Co-immunoprecipitation, Rnd3 knockout/transgenic mice, transverse aortic constriction model, CoCl2 pharmacological rescue, angiogenesis assays\",\n      \"journal\": \"Hypertension\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus genetic mouse models with pharmacological rescue; single lab\",\n      \"pmids\": [\"26781283\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"RhoE interacts with p65 and p50 NF-κB subunits individually in the cytosol, blocks their nuclear translocation, and also occupies the dimerization domain of p65 to disrupt p65/p50 heterodimerization. This was demonstrated by bimolecular fluorescence complementation, co-immunoprecipitation, and EMSA. Cardiac RhoE overexpression inhibited NF-κB activity, restrained post-MI inflammation, and improved cardiac function and survival.\",\n      \"method\": \"Bimolecular fluorescence complementation, co-immunoprecipitation, electrophoretic mobility shift assay (EMSA), genetic mouse models (cardiomyocyte-specific overexpression/haploinsufficiency), MI model\",\n      \"journal\": \"Circulation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (BiFC, Co-IP, EMSA) plus in vivo genetic models with functional cardiac phenotypes\",\n      \"pmids\": [\"30586715\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"In osteoclasts, RhoE is indispensable for migration and bone resorption by maintaining fast actin turnover in podosomes. RhoE activates the actin depolymerizing protein cofilin by inhibiting its ROCK-mediated phosphorylation. Primary RhoE-deficient osteoclasts showed dysfunctional sealing zones and impaired podosome patterning, establishing a RhoE-ROCK-cofilin pathway for podosome dynamics.\",\n      \"method\": \"Primary RhoE-deficient osteoclast isolation, bone resorption assays, actin turnover imaging, cofilin phosphorylation western blotting, ROCK inhibitor experiments\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — primary knockout cells with functional resorption assay plus biochemical pathway analysis; single lab\",\n      \"pmids\": [\"24284899\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Rnd3 silencing in embryonic cerebral cortex radial glial progenitors disrupts interkinetic nuclear migration, apical attachment, and orientation of cleavage plane through actin-dependent mechanisms. These defects were rescued by co-expression of constitutively active cofilin, demonstrating that Rnd3-mediated actin filament disassembly coordinates radial glial cell behavior. Additionally, Rnd3 limits basal progenitor divisions via suppression of cyclin D1 translation through a distinct actin-independent mechanism.\",\n      \"method\": \"In utero electroporation, constitutively active cofilin rescue, siRNA knockdown, cell cycle analysis, cyclin D1 translation assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo knockdown with direct genetic rescue (active cofilin), two distinct mechanistic pathways established\",\n      \"pmids\": [\"23535656\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"RhoE is required for myoblast elongation and alignment before fusion. RhoE-deficient myoblasts show defective p190RhoGAP activation and failure to inhibit RhoA at the onset of fusion. RhoE also interacts with ROCK I, whose activity must be downregulated to allow fusion. Pharmacological inactivation of RhoA or ROCK restored myoblast fusion in RhoE-deficient cells, establishing RhoE's role upstream of p190RhoGAP-RhoA-ROCK I in myoblast fusion.\",\n      \"method\": \"RhoE siRNA knockdown in C2C12 cells, p190RhoGAP activity assay, RhoA activity assay, co-immunoprecipitation with ROCK I, pharmacological RhoA/ROCK inhibition rescue\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — knockdown with pharmacological rescue, biochemical pathway activity assays, Co-IP; multiple orthogonal methods\",\n      \"pmids\": [\"18369372\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"RhoE is farnesylated and localizes partly on membranes (including Golgi and plasma membrane) and in the cytosol. ROCK I-mediated phosphorylation reduces RhoE membrane association and correlates with its activity in inducing stress fiber disruption. RhoE also acts independently of ROCK to inhibit cell cycle progression, in part by preventing translation of cyclin D1.\",\n      \"method\": \"Farnesylation inhibitor treatment, subcellular fractionation, phospho-mutant analysis, ROCK inhibitor experiments, cyclin D1 translation assays\",\n      \"journal\": \"Biochemical Society transactions\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — review/methods paper but citing original experimental data; subcellular fractionation and functional assays\",\n      \"pmids\": [\"16042565\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"RhoE-deficient neurons exhibit decreased neurite number and length, reduced axon outgrowth, and delayed neuronal polarization. These defects involve the RhoA/ROCK/LIMK/cofilin signaling pathway, as evidenced by altered cofilin phosphorylation in RhoE-null hippocampal neurons.\",\n      \"method\": \"RhoE knockout hippocampal neuron cultures, neurite morphology analysis, cofilin/LIMK phosphorylation western blotting\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — primary knockout neurons with morphological and biochemical pathway readouts; single lab\",\n      \"pmids\": [\"22428561\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Rnd3 upregulation in mid-pregnant rabbit myometrium correlates with inhibition of RhoA-Rho kinase-mediated Ca2+ sensitization. Treatment with farnesyl-transferase inhibitor manumycin A (blocking Rnd3 membrane targeting) restored RhoA-Rho kinase-dependent Ca2+ sensitization in mid-pregnant myometrium, establishing Rnd3 farnesylation as mechanistically required for its inhibition of myometrial contractility.\",\n      \"method\": \"Differential gene expression screening (cDNA array), protein expression western blotting, permeabilized smooth muscle contractility assays, farnesyl-transferase inhibitor treatment\",\n      \"journal\": \"The Journal of physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional contractility assay with pharmacological inhibitor establishing mechanism; single lab\",\n      \"pmids\": [\"14561824\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"The RhoE/ROCK/ARHGAP25 signaling pathway controls cell invasion: RhoE expression is low in alveolar rhabdomyosarcoma (ARMS), and its overexpression reduces invasion potential. ROCK (regulated by RhoE) activates ARHGAP25, a GAP for Rac, which is required downstream of ROCK II for ARMS cell invasion. This defines a RhoE→ROCK→ARHGAP25→Rac inhibition pathway promoting invasive potential.\",\n      \"method\": \"3D spheroid invasion assay, RhoE overexpression/knockdown, ROCK II inhibition, ARHGAP25 knockdown, Rac activity assay\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pathway epistasis established with multiple KD/KO approaches and Rac activity assay; single lab\",\n      \"pmids\": [\"27413008\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"A RhoA-ROCK-Rnd3 feedback loop determines local sites of actin cortex reassembly during membrane blebbing. Live-cell imaging revealed that Eps8 and activated ezrin mark foci where local actin reassembly occurs in blebs, and this process is regulated by the RhoA-ROCK-Rnd3 circuit.\",\n      \"method\": \"Live-cell imaging of GFP-actin, fluorescent Eps8 and ezrin reporters, ROCK inhibitor treatment, Rnd3 manipulation\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — live-cell imaging with functional inhibitor experiments establishing feedback loop; single lab\",\n      \"pmids\": [\"26976596\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Rnd3 knockdown in HCC cells increased cell motility and invasiveness. Stable Rnd3 knockdown enhanced phosphorylation of myosin phosphatase targeting subunit (MYPT1), promoted stress fiber assembly, and increased plasma membrane blebbing, all consistent with activation of the Rho/ROCK pathway. In vivo, Rnd3 knockdown enhanced local invasion of HCC cells with increased venous invasion.\",\n      \"method\": \"Lentiviral shRNA knockdown, in vitro motility/invasion assays, MYPT1 phosphorylation western blot, orthotopic liver injection mouse model, histological analysis\",\n      \"journal\": \"Hepatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function with biochemical pathway readouts and in vivo validation; single lab\",\n      \"pmids\": [\"22829315\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"RhoE interacts with Skp2 (an F-box protein/E3 ubiquitin ligase component). RhoE protein levels are regulated by proteasomal degradation: RhoE accumulates in G1 and decreases at the G1/S transition, with a half-life shorter than other Rho proteins. The Skp2-interacting domain maps to amino acids 231-240 of RhoE, and Lys235 is the ubiquitylation substrate. Skp2 overexpression decreases both RhoE and p27 levels.\",\n      \"method\": \"Co-immunoprecipitation with Skp2, proteasome inhibitor treatment, protein half-life measurements, domain mapping with deletion mutants, Lys235 site-directed mutagenesis, flow cytometry cell cycle analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — Co-IP, mutagenesis identifying ubiquitylation site, functional cell cycle analysis; single lab with multiple orthogonal methods\",\n      \"pmids\": [\"24045951\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"RhoE is regulated by cyclic AMP/PKA signaling in trophoblast cells: treatment with cAMP analogue dbcAMP strongly upregulated RhoE, and this was mediated through PKA (blocked by PKA-specific inhibitor PKI and mimicked by N6-phenyl-cAMP). RhoE silencing by RNAi significantly decreased dbcAMP-induced BeWo cell fusion without affecting differentiation markers.\",\n      \"method\": \"PKA-specific cAMP analogues, PKA inhibitor (14-22 amide), RNAi knockdown, fusion index quantification, HCG/PLAP differentiation markers\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological dissection of signaling pathway plus functional RNAi, single lab\",\n      \"pmids\": [\"22272352\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Rnd3 in endothelial cells acts through RhoB: Rnd3 overexpression increases RhoB expression, which is then required for Rnd3-induced stress fiber assembly (a response opposite to other cell types). Rnd3 does not act through known signaling partners (p190RhoGAP, ROCK, Syx) in endothelial cells and does not need membrane association to increase stress fibers.\",\n      \"method\": \"Rnd3 overexpression, RhoB knockdown, dominant-negative and constitutively active mutants, actin immunofluorescence, RhoB expression western blotting\",\n      \"journal\": \"Biology open\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis by RhoB knockdown establishing RhoB-dependence, negative results ruling out known partners; single lab\",\n      \"pmids\": [\"23430146\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Rnd3 interacts with plexin-B2 preferentially over plexin-B1 and -B3 (shown by immunoprecipitation). Plexin-B2 promotes Rnd3-induced cell rounding and loss of stress fibers, and enhances Rnd3-mediated inhibition of HeLa cell invasion. Specific amino acids in Rnd3 required for plexin-B2 interaction were identified; mutation of these residues prevents Rnd3-induced morphological changes.\",\n      \"method\": \"Co-immunoprecipitation, site-directed mutagenesis of Rnd3:plexin-B2 interface, cell rounding assays, invasion assays\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with mutagenesis and functional cell morphology/invasion assays; single lab\",\n      \"pmids\": [\"27656111\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Rnd3 downregulation in Rnd3 haploinsufficient mice leads to elevated ROCK kinase activity, remarkable apoptosis, and increased caspase-3 in hearts under pressure overload. Pharmacological ROCK inhibition (fasudil) partially improved cardiac function. Genetic deletion of ROCK1 in Rnd3 haploinsufficient mice (Rnd3+/-/ROCK1-/-) partially but not completely rescued heart failure, indicating ROCK1-dependent and -independent mechanisms for Rnd3-mediated cardiac protection.\",\n      \"method\": \"Haploinsufficient Rnd3+/- mice, transverse aortic constriction, ROCK1 double-knockout, fasudil pharmacological treatment, caspase-3 activity, cardiac function echocardiography\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with double knockout plus pharmacological rescue; single lab\",\n      \"pmids\": [\"24901055\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Restoration of Rnd3 levels in IPF fibroblasts increases p190RhoGAP activity and decreases RhoA activity, reducing the fibrotic phenotype. IPF drugs nintedanib and pirfenidone decrease RhoA activity and fibrotic phenotype by upregulating Rnd3 expression and p190RhoGAP activity, establishing a Rnd3→p190RhoGAP→RhoA pathway in IPF.\",\n      \"method\": \"Rnd3 re-expression in IPF fibroblasts, p190RhoGAP activity assay, RhoA activity assay, pharmacological drug treatment, fibrosis phenotype assays\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pathway activity assays with Rnd3 restoration and drug treatment; single lab\",\n      \"pmids\": [\"29995590\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Rnd3 physically interacts with PPARγ and promotes the PPARγ-UCP2 signaling cascade. Loss of Rnd3 in trophoblasts leads to excessive ROS, mitochondrial injury, and proton leakage; forced expression of PPARγ rescues Rnd3 deficiency-mediated mitochondrial dysfunction. This defines a Rnd3-PPARγ-UCP2 pathway regulating placental mitochondrial ROS.\",\n      \"method\": \"Co-immunoprecipitation, ROS/mitochondrial function assays, Rnd3 overexpression/knockdown in primary PE trophoblasts, PPARγ overexpression rescue\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus functional rescue with PPARγ; single lab\",\n      \"pmids\": [\"34046947\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Rnd3 directly interacts with the ring finger domain of TRAF6, suppresses K63-linked TRAF6 ubiquitination, and promotes K48-linked TRAF6 ubiquitination, thereby inhibiting NF-κB activation and promoting TRAF6 degradation. This was established by LC-MS/MS, Co-IP, and molecular docking. TRAF6 knockdown countered Rnd3 knockout-induced EC pyroptosis in vivo and in vitro.\",\n      \"method\": \"LC-MS/MS, co-immunoprecipitation, molecular docking, K63/K48 ubiquitination assays, endothelium-specific Rnd3 transgenic/knockout mice, TRAF6 knockdown rescue\",\n      \"journal\": \"Clinical and translational medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, mass spectrometry identification, ubiquitination type specificity assays with genetic rescue; single lab\",\n      \"pmids\": [\"37743632\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Rnd3 directly binds ROCK1 in the cytoplasm and inhibits ROCK1-induced Drp1 phosphorylation at Ser616, thereby inhibiting mitochondrial fission and PANoptosis (apoptosis, pyroptosis, necroptosis) in doxorubicin-induced cardiotoxicity. ROCK1 knockdown nullified the cardioprotective effects of Rnd3. This was established by co-immunoprecipitation, protein-protein docking, and cardiomyocyte-specific transgenic/knockout models.\",\n      \"method\": \"Co-immunoprecipitation, protein-protein molecular docking, Drp1 Ser616 phosphorylation assays, cardiomyocyte-specific Rnd3-Tg and Rnd3LSP/LSP mice, ROCK1 siRNA knockdown\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus docking plus genetic models with epistatic ROCK1 KD; single lab\",\n      \"pmids\": [\"39755713\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"In cardiac fibroblasts, Rnd3 regulates Notch signaling by interacting with NICD and regulates TGF-β signaling by interacting with ROCK1. Fibroblast-specific Rnd3 overexpression suppressed Notch and TGF-β signaling, attenuated cardiac oxidative stress and fibrosis. Glucotoxicity and lipotoxicity control Rnd3 expression by regulating binding of nuclear receptor Nr1H2 to the Rnd3 promoter (established by ChIP).\",\n      \"method\": \"Co-immunoprecipitation (NICD and ROCK1), RNA sequencing, ChIP assay (Nr1H2 binding to Rnd3 promoter), fibroblast-specific Rnd3 knockout and transgenic mice, in vitro fibroblast assays\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus ChIP plus genetic mouse models; single lab\",\n      \"pmids\": [\"36438502\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"RND3 knockdown in primary human adipocytes reduces cAMP- and isoproterenol-induced lipolysis, partly explained by reduced protein expression of ATGL and phosphorylated HSL. This effect was mimicked by ROCK inhibitor treatment, placing RND3 upstream of ROCK in the lipolysis regulatory pathway.\",\n      \"method\": \"siRNA knockdown in primary human adipocytes, lipolysis assays, ATGL/HSL western blotting, ROCK inhibitor phenocopy\",\n      \"journal\": \"Metabolism: clinical and experimental\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function in primary cells with biochemical pathway readouts and pharmacological phenocopy; single lab\",\n      \"pmids\": [\"31672447\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"RhoE is required for keratinocyte differentiation and stratification. RhoE protein levels are specifically and transiently upregulated upon keratinocyte differentiation, and this upregulation requires ROCK I activity. RhoE overexpression caused cell enlargement and increased stratification; RhoE depletion induced hyperproliferation and delayed differentiation initiation. RhoE negatively modulates integrin adhesion in basal cells to facilitate detachment for suprabasal migration.\",\n      \"method\": \"siRNA depletion, adenoviral overexpression, 3D organotypic stratification model, BrdU proliferation assay, integrin adhesion assays, western blotting for differentiation markers\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function and gain-of-function with differentiation model and multiple functional readouts; single lab\",\n      \"pmids\": [\"18923151\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Mutant B-RAF (V600E) maintains Rnd3 expression via the MEK/ERK1/2 pathway in melanoma cells. B-RAF knockdown or MEK inhibition attenuated Rnd3 expression and elevated RhoA/ROCK/LIMK-2 signaling, increasing cofilin phosphorylation and stress fiber formation. Constitutive Rnd3 expression suppressed the actin and focal adhesion effects of B-RAF knockdown, placing Rnd3 as a cross-talk regulator between RAF/MEK/ERK and Rho/ROCK signaling pathways.\",\n      \"method\": \"siRNA knockdown of B-RAF, MEK pharmacological inhibition, constitutive Rnd3 expression rescue, cofilin/LIMK-2 phosphorylation western blotting, focal adhesion imaging\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pathway epistasis with knockdown and pharmacological inhibitors plus genetic rescue; single lab\",\n      \"pmids\": [\"18045987\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"RhoE induces neurite-like outgrowth in PC12 cells in the absence of NGF, acting through inhibition of the RhoA/ROCK I signaling pathway. RhoE overexpression decreased RhoA activity and reduced ROCK I and phospho-MLCP expression. Overexpression of active RhoA or ROCK I abolished RhoE-promoted neurite outgrowth. RhoE siRNA knockdown reduced NGF-induced neurite formation, and Rac/Cdc42 also contribute to RhoE-induced neurite outgrowth.\",\n      \"method\": \"RhoE overexpression, dominant-active RhoA/ROCK I rescue, siRNA knockdown, RhoA activity assay, MLCP phosphorylation western blot, neurite measurement\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with active RhoA/ROCK1 rescue plus knockdown; single lab\",\n      \"pmids\": [\"19968760\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"KIAA1429 (m6A methyltransferase component) negatively regulates RND3 mRNA stability in coordination with the m6A reader YTHDC1. KIAA1429 mediates m6A modification of RND3 mRNA via its RNA binding domain. RNA stability assays, RIP, and MeRIP-qPCR established that increased m6A modification leads to decreased RND3 mRNA stability and expression.\",\n      \"method\": \"RNA stability assays, RNA immunoprecipitation (RIP), MeRIP-qPCR, luciferase assay, KIAA1429 and YTHDC1 knockdown/overexpression\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal RNA biology methods establishing m6A-dependent mRNA degradation mechanism; single lab\",\n      \"pmids\": [\"38224863\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RND3/RhoE is a constitutively GTP-bound, GTPase-deficient Rho family protein that inhibits RhoA signaling primarily by directly binding and inhibiting ROCK I (not ROCK II) at its kinase domain N-terminus, preventing phosphorylation of myosin light chain phosphatase and thereby promoting actin stress fiber disassembly; its activity is regulated post-translationally by ROCK I-mediated phosphorylation (at Ser11 and other sites, increasing stability and cytosolic localization), PKCα-mediated phosphorylation (altering membrane targeting), Skp2-mediated proteasomal degradation, and transcriptionally by p53, HIF-1α, and Notch1; beyond ROCK I inhibition, RND3 exerts ROCK-independent anti-proliferative effects by blocking 4E-BP1 phosphorylation to inhibit cap-dependent translation of cyclin D1 and c-Myc, promotes NICD/Snail1 ubiquitination and degradation to suppress Notch signaling and cell migration, interacts with p65/p50 NF-κB subunits to block nuclear translocation, stabilizes HIF1α to promote angiogenesis, interacts with importins to facilitate Notch1 nuclear translocation in a feedback loop, and activates p190RhoGAP by targeting it to lipid rafts via its N-terminal KERRA sequence.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RND3/RhoE is an atypical Rho-family protein that, unlike classical Rho GTPases, is constitutively GTP-bound and GTPase-deficient, acting as a negative regulator of RhoA-ROCK signaling to drive actin stress fiber disassembly and remodel cell shape, migration, and survival [#1, #2]. Its constitutive GTP-bound state arises from substitution of the catalytic glutamine and switch-II serines that prevent GTP hydrolysis [#2]. The central effector mechanism is direct binding to ROCK I (but not ROCK II), engaging the kinase domain N-terminal region at a site distinct from the RhoA-binding site to block phosphorylation of myosin light chain phosphatase and disassemble stress fibers [#0]; structural and domain-mapping work defined a bipartite interaction in which an effector-region contact mediates inhibition while a separate C-lobe \\u03b1G-helix contact positions RND3 for multi-site phosphorylation by ROCK I, and N-terminal ROCK I dimerization is required for binding [#4, #11]. RND3 also activates p190RhoGAP by targeting it to lipid rafts via its N-terminal KERRA sequence, providing a parallel route to RhoA suppression [#13]. Beyond ROCK inhibition, RND3 exerts ROCK-independent anti-proliferative effects by blocking mTOR-independent 4E-BP1 phosphorylation, thereby restraining cap-dependent translation of cyclin D1 and c-Myc and inhibiting cell-cycle progression and Ras/Raf-induced transformation [#6, #12]. RND3 additionally functions as a scaffold for protein turnover and transcriptional control: it promotes ubiquitination and degradation of the Notch intracellular domain and of Snail1 to suppress Notch signaling and migration [#15, #19], and sequesters NF-\\u03baB p65/p50 subunits in the cytosol to block their nuclear translocation and dimerization [#21]. RND3 activity is tightly regulated post-translationally\\u2014by ROCK I phosphorylation at Ser11 that enhances stability and cytosolic localization [#3], PKC\\u03b1 phosphorylation that redirects membrane targeting [#10], farnesylation-dependent membrane association [#27], and Skp2-mediated proteasomal degradation at Lys235 [#31]\\u2014and transcriptionally by p53 under genotoxic stress, where RND3 inhibits ROCK I-mediated apoptosis to promote survival [#9]. Through these activities RND3 governs diverse physiological processes including keratinocyte differentiation, cortical neuron migration, myoblast fusion, osteoclast podosome dynamics, and cardiac stress responses [#15, #17, #22, #24, #42]; in mice, Rnd3 deletion causes hydrocephalus via enhanced Notch signaling [#15].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Established that RhoE is an atypical Rho protein that is constitutively GTP-bound rather than cycling, and that it antagonizes RhoA by disassembling stress fibers and increasing migration\\u2014inverting the canonical Rho phenotype.\",\n      \"evidence\": \"Biochemical GTP/GDP binding and GTPase assays plus microinjection and migration readouts in macrophages and MDCK cells\",\n      \"pmids\": [\"9671486\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify the direct molecular target through which RhoE antagonizes RhoA\", \"Mechanism of constitutive GTP-loading not yet structurally explained\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Provided the structural basis for the constitutive GTP-bound state, answering why RND3 cannot hydrolyze GTP.\",\n      \"evidence\": \"X-ray crystallography of the RhoE G-domain bound to GTP/Mg2+ at 2.1 \\u00c5\",\n      \"pmids\": [\"12009891\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structure of the core domain alone does not reveal effector engagement\", \"Does not address regulation by phosphorylation or localization\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Identified ROCK I as the direct effector target, defining the central molecular mechanism by which RhoE inhibits RhoA-driven contractility.\",\n      \"evidence\": \"Reciprocal co-IP of endogenous proteins, colocalization on trans-Golgi, and ROCK I activity readouts (MLC phosphatase phosphorylation, stress fibers)\",\n      \"pmids\": [\"12773565\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve the structural binding interface\", \"Selectivity for ROCK I over ROCK II mechanistically unexplained at the time\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Demonstrated a ROCK-independent anti-proliferative function, showing RhoE blocks cell-cycle progression at the pRb checkpoint without altering canonical mitogenic kinases.\",\n      \"evidence\": \"Inducible RhoE expression with BrdU/flow cytometry, cyclin D1/p21 blotting, and E7/E1A/cyclin E epistatic rescue\",\n      \"pmids\": [\"15340047\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The molecular target mediating cyclin D1 loss was not identified\", \"Distinction from ROCK pathway left mechanistically incomplete\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Established phosphoregulation of RhoE, showing ROCK I phosphorylates RhoE at Ser11 to increase stability and shift it to the cytosol, creating a feedback layer on its own inhibitory activity.\",\n      \"evidence\": \"In vitro kinase assays, phospho-specific antibodies, fractionation, and PDGF/PKC stimulation in cells\",\n      \"pmids\": [\"15775972\", \"16042565\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Number and identity of all phosphosites beyond Ser11 not fully resolved\", \"Functional consequence of each individual site not separated\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Resolved the RhoE:ROCK I structure and showed inhibition and phosphorylation occur through distinct contacts, while PDK1 competition and ROCK I dimerization gate the interaction.\",\n      \"evidence\": \"Co-crystal structure with mutagenesis, plus siRNA depletion and binding competition assays\",\n      \"pmids\": [\"18946488\", \"18215121\", \"18204440\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The effector-region partner mediating actin disassembly was not identified\", \"How phosphorylation feeds back onto the structural interface in vivo not fully defined\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Identified the molecular basis of RhoE's ROCK-independent growth inhibition as mTOR-independent blockade of 4E-BP1 phosphorylation, restraining cap-dependent translation of cyclin D1 and c-Myc.\",\n      \"evidence\": \"Cap pull-down, 4E-BP1/eIF4E interaction blots, mTOR/Raptor co-IP, and eIF4E genetic rescue of transformation\",\n      \"pmids\": [\"19850923\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The proximal RhoE target upstream of 4E-BP1 was not identified\", \"Connection to the constitutive GTP-bound state unclear\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Showed PKC\\u03b1 directly phosphorylates Rnd3 to control its internal-membrane localization and ROCK-pathway inhibitory capacity, adding a second kinase regulatory input.\",\n      \"evidence\": \"In vitro PKC\\u03b1 kinase assay, PKC\\u03b1-null cells, and non-phosphorylatable mutant with fractionation\",\n      \"pmids\": [\"19723022\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"PKC\\u03b1 phosphosites not precisely mapped relative to ROCK I sites\", \"Interplay between PKC\\u03b1 and ROCK I phosphorylation unresolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Explained Rnd-family functional specificity in RhoA inhibition by identifying the N-terminal KERRA lipid-raft targeting sequence required for p190RhoGAP activation.\",\n      \"evidence\": \"N-terminal mutation analysis, lipid raft fractionation, and p190RhoGAP activity assays\",\n      \"pmids\": [\"22357615\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab domain mapping not independently confirmed\", \"How raft localization couples mechanistically to GAP activation not detailed\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Established RND3 as a degradation scaffold in Notch signaling, promoting NICD ubiquitination via FBW7 to suppress Notch transcription, with in vivo loss causing hydrocephalus.\",\n      \"evidence\": \"Reciprocal co-IP, ubiquitination assays, knockout mice with pharmacological Notch-inhibition rescue\",\n      \"pmids\": [\"23630292\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How a GTPase-fold protein scaffolds the ubiquitin machinery structurally unknown\", \"Relationship to RhoE's actin-regulating function unclear\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Defined RhoE as the upstream regulator of a ROCK-cofilin axis controlling actin turnover across cell types, integrating its function into tissue-level processes.\",\n      \"evidence\": \"Primary knockout/knockdown cells (osteoclasts, radial glia, myoblasts) with cofilin readouts and active-cofilin or RhoA/ROCK inhibitor rescue\",\n      \"pmids\": [\"24284899\", \"23535656\", \"18369372\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tissue-specific differences in RhoE output not mechanistically reconciled\", \"Quantitative thresholds of RhoA inhibition needed in each context undefined\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Expanded RhoE's regulatory roles to membrane-receptor turnover and migration control, showing it routes \\u03b22-AR to lysosomal degradation and degrades Snail1, while plexin-B2 antagonizes its RhoA-inhibitory function.\",\n      \"evidence\": \"Knockout mice, ubiquitination assays, in utero electroporation, competition binding, and co-IP\",\n      \"pmids\": [\"25348166\", \"27705942\", \"24572910\", \"24525741\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether RhoE acts catalytically or stoichiometrically in degradation pathways unresolved\", \"Some interactions rest on single-lab co-IP\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Established a transcription-factor sequestration mechanism, with RhoE binding p65/p50 to block NF-\\u03baB nuclear translocation and heterodimerization, defining a cardioprotective anti-inflammatory role.\",\n      \"evidence\": \"BiFC, co-IP, EMSA, and cardiomyocyte-specific genetic models in a myocardial infarction setting\",\n      \"pmids\": [\"30586715\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of p65 dimerization-domain occupancy not solved\", \"Relationship to RhoE's GTP-bound conformation unknown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Extended RhoE's ubiquitin-editing activity to TRAF6, showing it shifts TRAF6 from K63- to K48-linked ubiquitination to suppress NF-\\u03baB and endothelial pyroptosis.\",\n      \"evidence\": \"LC-MS/MS, co-IP, molecular docking, linkage-specific ubiquitination assays, and endothelial Rnd3 mouse models with TRAF6-knockdown rescue\",\n      \"pmids\": [\"37743632\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct enzymatic versus scaffolding role in ubiquitin-linkage switching not distinguished\", \"Single-lab finding awaiting independent confirmation\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How RND3's single constitutively GTP-bound G-domain mechanistically partitions among its many divergent outputs\\u2014ROCK I inhibition, translational control, ubiquitin-mediated degradation of NICD/Snail1/TRAF6, and transcription-factor sequestration\\u2014remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model explains how one G-domain scaffolds ubiquitin ligases versus binding ROCK I\", \"The branch point determining ROCK-dependent versus ROCK-independent outputs in a given cell is undefined\", \"Whether degradation-promoting interactions require the effector loop or distinct surfaces is unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003924\", \"supporting_discovery_ids\": [1, 2]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 4, 12, 21]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [0, 13]},\n      {\"term_id\": \"GO:0140313\", \"supporting_discovery_ids\": [21]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [3, 25, 39]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [1, 5, 25]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [0, 25]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 7, 13]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [6, 12, 31]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [15, 31, 38]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [9, 38, 39]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"ROCK1\", \"PDK1\", \"Skp2\", \"NICD\", \"Snail1\", \"RELA\", \"TRAF6\", \"PLXNB2\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}