| 1998 |
Rnd1 is constitutively GTP-bound due to low GDP affinity and rapid spontaneous nucleotide exchange, and lacks intrinsic GTPase activity. Expression of Rnd1 in fibroblasts inhibits actin stress fibers, membrane ruffles, and integrin-based focal adhesions, inducing cell rounding and loss of cell-substrate adhesion. |
GTPase activity assays, nucleotide binding assays, overexpression in fibroblasts with cytoskeletal and adhesion readouts |
The Journal of cell biology |
High |
9531558
|
| 1998 |
Rnd1 is concentrated at adherens junctions in confluent fibroblasts and epithelial cells, as determined by subcellular localization experiments. |
Subcellular fractionation and immunostaining |
The Journal of cell biology |
Medium |
9531558
|
| 2002 |
Rnd1 directly binds the cytoplasmic domain of Plexin-A1, and constitutively active Rnd1 is sufficient to trigger Plexin-A1 signaling and cytoskeletal collapse even in the absence of Semaphorin 3A. RhoD antagonizes this effect by blocking Plexin-A1 activation by Rnd1. |
Co-immunoprecipitation, pulldown, overexpression/dominant-negative experiments, growth cone collapse assay |
The Journal of neuroscience |
High |
11784792
|
| 2003 |
Rnd1 directly interacts with the cytoplasmic domain of Plexin-B1, promotes the interaction between Plexin-B1 and PDZ-RhoGEF, and dramatically potentiates Plexin-B1-mediated RhoA activation in response to Semaphorin 4D, leading to cell contraction via the PDZ-RhoGEF/RhoA/ROCK pathway. |
Co-immunoprecipitation, pulldown, dominant-negative RhoA and PDZ-RhoGEF constructs, ROCK inhibitor treatment, RhoA activity assay in COS-7 cells |
The Journal of biological chemistry |
High |
12730235
|
| 2003 |
Rnd1 promotes dendritic spine elongation in hippocampal neurons. Antisense-mediated knockdown of endogenous Rnd1 reduces spine number and width and increases headless protrusions, demonstrating a role in spine formation during the synaptogenic stage. |
Overexpression in cultured hippocampal neurons, antisense oligonucleotide knockdown, immunoblot of synaptosomal fractions, morphometric analysis |
The Journal of neuroscience |
Medium |
14657163
|
| 1999 |
Recombinant prenylated Rnd1 dose-dependently inhibits carbachol- and GTPγS-induced Ca2+ sensitization in permeabilized smooth muscle by interfering with a RhoA-dependent mechanism, without affecting Ca2+-tension relationships or calyculin A-induced tension. |
Permeabilized smooth muscle strip force measurements, recombinant protein application, dose-response analysis |
The Journal of physiology |
Medium |
10200428
|
| 2000 |
Rnd1 expression in PC12 cells induces formation of neuritic processes by disrupting cortical actin filaments; this process formation is inhibited by dominant-negative Rac1, placing Rnd1 upstream of Rac in this neuritic outgrowth pathway. |
Overexpression in PC12 cells, cytochalasin D comparison, dominant-negative Rac1 epistasis, cytoskeletal staining |
Biochemical and biophysical research communications |
Medium |
11095956
|
| 2000 |
Rnd1 interacts with the adapter protein Grb7 via the Rnd1 switch II loop and the Grb7 SH2 domain, as demonstrated by yeast two-hybrid, in vitro pulldown, and pulldown from SK-BR3 breast cancer cells. |
Yeast two-hybrid, in vitro pulldown, cell lysate pulldown |
FEBS letters |
Medium |
10664463
|
| 2005 |
Rnd1 directly associates with FRS2α and FRS2β (docking proteins of FGF receptors). FRS2β binding suppresses the inhibitory effect of Rnd1 on RhoA. Upon FGF receptor 1 activation, FRS2β is phosphorylated, recruits Shp2, and releases Rnd1, which then inhibits RhoA activity. Rnd1 knockdown suppresses FGF-induced neurite outgrowth in PC12 cells. |
Co-immunoprecipitation, in vitro pulldown, siRNA knockdown, RhoA activity assay, dominant-negative and constitutively active constructs |
The Journal of biological chemistry |
High |
15738000
|
| 2006 |
Rnd1 is required for neuronal activity-dependent dendritic development in hippocampal neurons. RNAi knockdown inhibits neuronal activity-dependent dendritic growth and BDNF-promoted dendritogenesis, and this inhibition is rescued by blocking the RhoA effector ROCK, placing Rnd1 upstream of RhoA/ROCK in dendritic development. |
RNAi knockdown, ROCK inhibitor rescue, BDNF treatment, morphometric dendritic analysis in hippocampal neurons |
Neuroscience letters |
Medium |
16530331
|
| 2007 |
Rnd1, Rac1, and RhoD all bind the same region (β-strands 3 and 4 and a short α-helix) of the plexin-B1 Rho GTPase binding domain (RBD), not the CRIB-like motif. GTPase binding destabilizes the homodimer of the plexin-B1 RBD, suggesting a regulatory model involving dimerization-dependent signaling. |
Solution NMR spectroscopy, 2.0 Å X-ray crystallography, binding interface mapping |
The Journal of biological chemistry |
High |
17916560
|
| 2009 |
Rnd1 physically and functionally interacts with Unc5B and mediates FLRT3-induced cell deadhesion in Xenopus embryos. Rnd1 and FLRT3 form a complex that modulates cell adhesion during early development. |
Co-immunoprecipitation, overexpression, morpholino knockdown in Xenopus embryos, cell adhesion assays |
PloS one |
Medium |
19492039
|
| 2011 |
Crystal structures of the plexin-A2 RBD in complex with Rnd1 and of plexin-C1 and -D1 RBDs alone reveal that in plexin-A2 and -B1, the RBD β3-β4 loop adjusts conformation to accommodate Rnd1 binding, whereas plexin-C1 and -D1 lack key nonpolar residues and do not significantly interact with Rnd1. Introduction of nonpolar residues in plexin-C1/-D1 generates Rnd1 affinity. |
X-ray crystallography, isothermal titration calorimetry, site-directed mutagenesis |
The Journal of biological chemistry |
High |
21610070
|
| 2012 |
Rnd1 and Rnd3, but not Rnd2, contain a KERRA sequence in their N-terminus that functions as a lipid raft-targeting determinant. This sequence mediates the targeting of p190 RhoGAP to lipid rafts, which is required for p190 RhoGAP activation and downstream RhoA inhibition. Rnd2 lacks this sequence and fails to activate p190 RhoGAP in cells despite equal direct binding to p190 RhoGAP in vitro. |
Lipid raft fractionation, p190 RhoGAP activity assay, N-terminal deletion/swap mutants, direct binding assays |
Molecular biology of the cell |
High |
22357615
|
| 2014 |
Rnd1 suppresses Ras signaling by activating the GAP domain of Plexin-B1, which inhibits Rap1. Rap1 inhibition derepresses p120 Ras-GAP, which then inhibits Ras-MAPK signaling. Rnd1 depletion induces EMT and cooperates with c-Myc deregulation or p53 loss for neoplastic conversion in mammary epithelial cells. |
Rnd1 depletion (siRNA/shRNA), Ras and Rap1 activity assays, epistasis with dominant-negative/constitutively active Ras pathway components, mouse mammary tumor models |
Nature cell biology |
High |
25531777
|
| 2014 |
Cytoplasmic STI1 (stress-inducible protein 1) directly interacts with Rnd1 specifically (not Rnd2 or Rnd3). STI1 overexpression prevents Rnd1-Plexin-A1-mediated cytoskeletal retraction in the COS collapse assay and enhances neurite outgrowth downstream of Rnd1 in PC-12 cells. |
Co-immunoprecipitation, COS collapse assay, PC-12 neurite outgrowth assay, overexpression |
Experimental cell research |
Medium |
24690281
|
| 2018 |
RND1 interacts with p53 by co-immunoprecipitation and leads to de-ubiquitination of p53 protein, promoting p53 stability and activating the p53-SLC7A11 signaling axis to induce lipid peroxidation and ferroptosis in glioblastoma cells. |
Co-immunoprecipitation, ubiquitination assays, western blot, luciferase reporter, in vivo xenograft |
Cell & bioscience |
Medium |
35505371
|
| 2018 |
RND1 overexpression inhibits the Raf/MEK/ERK cascade and reduces RhoA activity in hepatocellular carcinoma cells, suppressing EMT-mediated metastasis. |
Overexpression and knockdown, ERK/RhoA activity assays, in vitro migration/invasion assays, in vivo mouse metastasis model |
Cell death & disease |
Medium |
29706627
|
| 2018 |
RND1 transcription is rapidly induced by topoisomerase I cleavage complexes (TOP1cc) in a PARP-1-dependent manner. PARP-1 inhibition reduces RND1 transcription; RND1 overexpression increases PARP-1 levels, indicating a cross-talk. RND1 protects cells from camptothecin-induced apoptosis. |
RT-PCR, mRNA stability assay, PARP-1 inhibitor treatment, camptothecin and UV/H2O2 treatment, overexpression/apoptosis assays |
Cell death & disease |
Medium |
30209297
|
| 2019 |
Rnd1 interacts with Myozap (an intercalated disc protein), identified by yeast two-hybrid and confirmed by co-immunoprecipitation. This interaction is functionally important: Rnd1 overexpression activates SRF-dependent signaling via the RhoA-Myozap network, promotes cardiomyocyte hypertrophy, and increases cardiomyocyte proliferation markers in response to mechanical stretch. |
Yeast two-hybrid screen, co-immunoprecipitation, overexpression in NRVCMs, SRF reporter assay, cell size and proliferation readouts |
Journal of molecular and cellular cardiology |
Medium |
30797814
|
| 2021 |
Molecular dynamics simulations show RND1 reinforces the plexin dimerization interface whereas RhoD destabilizes it, due to differential interaction with the inner leaflet of the cell membrane. RND1 and RhoD interact differently with the membrane via allosteric networks involving the RBD, RBD linkers, and a buttress segment. RhoD's short C-terminal tail and positively charged membrane interface distinguish it from RND1. |
Molecular dynamics simulations (structural/computational) |
eLife |
Low |
34114565
|
| 2022 |
RND1 is a direct Notch transcriptional target in endothelial cells, required for Notch-mediated suppression of endothelial migration and sprouting angiogenesis, and for Notch control of Ras activity in endothelial cells. |
Transcriptomic analysis (RNA-seq), chromatin studies, RND1 knockdown with migration and angiogenesis assays, Ras activity assay |
Scientific reports |
Medium |
35102202
|
| 2022 |
Rnd1 counteracts intracellular calcium fluctuations by inhibiting RhoA activation, thereby inhibiting virus internalization in innate immune defense. Rnd1 also facilitates production of pro-inflammatory cytokines IL-6 and TNF-α through Plexin-B1 to combat intracellular bacterial infections. |
Overexpression and knockdown of Rnd1, calcium flux assays, viral infection assays, cytokine measurement (ELISA), Plexin-B1 interaction |
Cell death & disease |
Medium |
35654795
|
| 2024 |
RND1 overexpression suppresses EMT in glioblastoma by inhibiting phosphorylation of AKT and GSK3-β, and enhances temozolomide sensitivity both in vitro and in vivo. |
Overexpression and knockdown in GBM cell lines, western blot for p-AKT/p-GSK3-β, transwell and wound-healing assays, in vivo xenograft with TMZ treatment |
Cancer biology & therapy |
Medium |
38444223
|
| 2010 |
RhoS/RSA-14-44, a testis-specific Rho GTPase renamed RhoS (also known as RHOS, an alias for RND1 according to HGNC), associates with PSMB5 (a catalytic proteasome subunit) in stage-specific spermatogenic cells and regulates the stability of unincorporated PSMB5 precursors in a GTPase activation-dependent manner, linking Rho GTPase signaling to proteasome biogenesis. |
Co-immunoprecipitation, overexpression of activated/dominant-negative forms, proteasome activity assays, expression analysis in spermatogenic cells |
Molecular biology of the cell |
Low |
20980621
|