| 2009 |
GOLPH3 binds specifically to phosphatidylinositol-4-phosphate (PtdIns(4)P) at the trans-Golgi membrane, and this binding is required for its Golgi localization. GOLPH3 also directly binds the unconventional myosin MYO18A, connecting the Golgi to F-actin. This GOLPH3/MYO18A/F-actin complex generates a tensile force required for efficient tubule and vesicle formation from the Golgi, and is responsible for stretching the Golgi into its extended ribbon morphology. |
Proteomic lipid-binding screen, Co-IP, knockdown/overexpression with morphology and trafficking readouts, fluorescence and electron microscopy |
Cell |
High |
19837035
|
| 2009 |
GOLPH3 localizes to the trans-Golgi network and interacts with components of the retromer complex. GOLPH3 regulates cell size and enhances growth-factor-induced mTOR signaling in human cancer cells, and its amplification drives oncogenesis. |
Gain- and loss-of-function studies in vitro and in vivo, interaction studies with retromer components, mTOR pathway analysis |
Nature |
High |
19553991
|
| 2009 |
Yeast Vps74 (GOLPH3 orthologue) requires ongoing PtdIns4P synthesis by the Pik1 PtdIns 4-kinase for Golgi targeting. Vps74/GOLPH3 bind specifically to PtdIns4P; a sulfate ion in a crystal structure of GOLPH3 indicated a phosphoinositide-binding site conserved in Vps74. Mutations in this site abolish phosphoinositide binding in vitro and Vps74 function in vivo. Vps74 retains Golgi-resident mannosyltransferases by recognizing their cytosolic tails. |
Crystal structure of GOLPH3, PtdIns4P-binding assays, site-directed mutagenesis, in vivo localization/function assays in yeast |
The Journal of cell biology |
High |
20026658
|
| 2014 |
DNA damage triggers Golgi dispersal through a pathway requiring GOLPH3, MYO18A, and F-actin. DNA-PK phosphorylates GOLPH3 in response to DNA damage, and this phosphorylation increases GOLPH3's interaction with MYO18A, amplifying the tensile force on the Golgi and causing its dispersal throughout the cytoplasm. This Golgi DNA-damage response promotes cell survival after DNA damage. |
DNA damage assays, kinase assays identifying DNA-PK as the GOLPH3 kinase, Co-IP showing increased GOLPH3-MYO18A interaction after phosphorylation, depletion/overexpression with survival readouts |
Cell |
High |
24485452
|
| 2012 |
Vps74 (GOLPH3 orthologue) binds directly to the catalytic domain of Sac1 PtdIns4P phosphatase (Kd = 3.8 μM). This interaction allows Vps74 to sense PtdIns4P levels on medial Golgi cisternae and direct Sac1-mediated dephosphorylation, locally terminating PtdIns4P signaling. Loss of Vps74 elevates PtdIns4P on medial Golgi and perturbs complex sphingolipid homeostasis. |
Binding assay (measured Kd), genetic analysis in yeast, PtdIns4P reporter localization, lipid analysis |
Molecular biology of the cell |
High |
22553352
|
| 2014 |
The crystal structure of Sac1 N-terminal domain in complex with Vps74 (GOLPH3 orthologue) was solved. The interface involves the N-terminal subdomain of the Sac1 homology domain. Disruption of the Sac1-Vps74 interface broadens intra-Golgi PtdIns4P distribution and causes failure to maintain residence of a medial Golgi mannosyltransferase. |
Crystal structure determination, interface mutagenesis, in vivo localization assays, PtdIns4P reporter |
The Journal of cell biology |
High |
25113029
|
| 2012 |
GOLPH3 family proteins (Vps74p) contain a conserved N-terminal arginine-motif that is necessary and sufficient to mediate direct binding to coatomer (COPI). Loss of coatomer binding renders Vps74p non-functional for glycosyltransferase retention. Vps74p oligomerization status and PtdIns4P-binding account for its membrane-binding capacity; an Arf1p-Vps74p interaction also contributes. |
Binding assays, site-directed mutagenesis of arginine motif, Co-IP/pulldown, in vivo function assays in yeast |
Traffic (Copenhagen, Denmark) |
High |
22889169
|
| 2013 |
GOLPH3L, a GOLPH3 paralogue, binds PI4P and localizes to the Golgi via PI4P binding, and is required for efficient anterograde trafficking similarly to GOLPH3. However, GOLPH3L is largely unable to bind MYO18A, and perturbation of GOLPH3L produces opposite effects on Golgi morphology compared to GOLPH3/MYO18A, antagonizing the GOLPH3/MYO18A pathway. |
PI4P-binding assays, Co-IP for MYO18A interaction, overexpression/knockdown with Golgi morphology and trafficking readouts |
Molecular biology of the cell |
High |
23345592
|
| 2013 |
Human myosin-18A (MYO18A) contains two actin-binding sites: one in the KE-rich region of the N-terminal extension (ATP-independent) and one in the generic motor domain (regulated by nucleotide). The PDZ module of MYO18A mediates direct binding to GOLPH3, and this interaction modulates the actin-binding properties of MYO18A's N-terminal extension. MYO18A motor domain lacks intrinsic ATP hydrolysis competence. |
Biochemical characterization of nucleotide binding, actin co-sedimentation assays, electron microscopy of decorated F-actin, pulldown assays for GOLPH3 binding, ATPase assay |
The Journal of biological chemistry |
High |
23990465
|
| 2013 |
Drosophila GOLPH3 (Rotini/Rti) regulates retrograde trafficking of EXT glycosyltransferases (EXT1/EXT2) within the Golgi. Reduction of Rti shifts EXT steady-state distribution toward the trans-Golgi, leading to their degradation; overexpression mislocalizes them toward cis-Golgi/ER. Both loss and overexpression result in incomplete heparan sulfate proteoglycans and perturbed Hedgehog signaling. GOLPH3 similarly modulates EXT1/2 stability in mammalian cells. |
Drosophila genetics (loss-of-function and overexpression), immunofluorescence localization, HSPG functional assay, mammalian cell validation |
Development (Cambridge, England) |
High |
23720043
|
| 2014 |
Drosophila GOLPH3 accumulates at the cleavage furrow during cell division and is essential for cytokinesis in spermatocytes and neuroblasts. GOLPH3 is required for contractile ring and central spindle formation, maintaining centralspindlin and Rho1 at the cell equator, and stabilizing Myosin II and Septin rings. The PI(4)P-binding ability of GOLPH3 is essential for its recruitment to the cleavage furrow and for accumulation of PI(4)P- and Rab11-associated secretory organelles at the cleavage site. |
Drosophila genetics (loss-of-function, PI4P-binding mutants), immunofluorescence, Co-IP with cytokinesis and trafficking components |
PLoS genetics |
High |
24786584
|
| 2016 |
The PtdIns(4)P/GOLPH3/MYO18A/F-actin pathway is necessary and limiting for directional cell migration. GOLPH3 promotes reorientation of the Golgi toward the leading edge and drives anterograde trafficking to the leading edge. GOLPH3 also promotes reorientation of lysosomes toward the leading edge indirectly, via its effect on the Golgi. Lysosome function itself is dispensable for migration. |
Knockdown/overexpression, live cell migration assays, organelle reorientation imaging, epistasis analysis with lysosome inhibition |
Molecular biology of the cell |
High |
27708138
|
| 2017 |
GTP-bound Rab1 directly interacts with GOLPH3 and controls its localization at the Golgi and at the cleavage site during cytokinesis in Drosophila. Loss of Rab1 (omelette/omt) disrupts Golgi architecture and actomyosin ring stabilization. Rab1 colocalizes with COG complex subunit Cog7 and GOLPH3 at Golgi stacks. |
Drosophila genetics, direct interaction assay (GTP-bound Rab1 pulldown with GOLPH3), immunofluorescence, transmission electron microscopy, 3D-SIM super-resolution microscopy |
Open biology |
High |
28100664
|
| 2021 |
GOLPH3 sorts a group of sequentially-acting glycosphingolipid biosynthetic enzymes operating at branchpoints into vesicles for intra-Golgi retro-transport, acting as a component of the cisternal maturation mechanism. GOLPH3 controls sub-Golgi localization and lysosomal degradation rate of specific enzymes. Increased GOLPH3 levels (as in tumors) alter glycosphingolipid synthesis and plasma membrane composition, promoting mitogenic signaling and cell proliferation. |
Binding assays, vesicle trafficking assays, subcellular fractionation, knockdown/overexpression with glycosphingolipid analysis and signaling readouts |
The EMBO journal |
High |
33749896
|
| 2005 |
MIDAS/GOLPH3 protein expression is enhanced by the absence of mitochondrial DNA (mtDNA). A majority of MIDAS localizes to mitochondria with a small fraction in the Golgi in HeLa cells. Overexpression increases total mitochondrial mass (accompanied by increased cardiolipin), while siRNA-mediated knockdown decreases it, without affecting mtDNA, RNA, or protein amounts. |
Stable transfection and siRNA knockdown, subcellular fractionation, cardiolipin measurement, mitochondrial mass quantification |
Journal of cell science |
Medium |
16263763
|
| 2012 |
PI4P and its binding protein GOLPH3 are required for hepatitis C virus (HCV) secretion. Silencing GOLPH3 dramatically reduces HCV virion secretion with concomitant accumulation of intracellular virions, indicating a stall in virion egress. Silencing MYO18A produces the same effect, consistent with GOLPH3 requiring MYO18A to apply tensile force for vesicle budding. |
siRNA knockdown of GOLPH3 and MYO18A, HCV infectivity and intracellular virion quantification, Golgi morphology analysis |
The Journal of biological chemistry |
Medium |
22745132
|
| 2018 |
GOLPH3 promotes cell proliferation and activates mTOR signaling via interaction with STK25 (serine/threonine protein kinase 25). STK25 interacts with GOLPH3 (confirmed by Co-IP, GST pull-down, and His-tag pull-down) and negatively regulates GOLPH3-dependent mTOR signaling and aerobic glycolysis. |
Co-immunoprecipitation, GST pull-down, His-tag pull-down, mTOR pathway western blot, glycolysis assays, xenograft model |
Journal of experimental & clinical cancer research |
Medium |
29996891
|
| 2017 |
CENPH (centromere protein H) interacts directly with GOLPH3 (confirmed by Co-IP, GST pull-down, His-tag pull-down, and confocal microscopy), and through this interaction attenuates GOLPH3-dependent mTOR signaling (both mTORC1 and mTORC2), reducing rapamycin sensitivity in colorectal cancer cells. |
Co-immunoprecipitation, GST pull-down, His-tag pull-down, confocal colocalization, mTOR pathway western blot, proliferation assays |
Journal of Cancer |
Medium |
28819418
|
| 2015 |
GOLPH3 promotes NF-κB pathway activation in hepatocellular carcinoma by promoting K63-linked polyubiquitination of TRAF2, RIP, and NEMO, thereby sustaining NF-κB activation. |
Overexpression and knockdown, ubiquitination assays (K63-linkage specific), western blot for NF-κB pathway components, in vitro and in vivo tumor models |
The Journal of pathology |
Medium |
25385148
|
| 2013 |
GOLPH3 regulates glioma cell migration and invasion through modulation of RhoA expression; downregulation of GOLPH3 reduces RhoA levels and inhibits cytoskeletal reorganization, while RhoA overexpression rescues the migration deficit caused by GOLPH3 knockdown. |
siRNA knockdown, RhoA expression analysis, migration/invasion assays, rescue experiment with RhoA overexpression |
Biochemical and biophysical research communications |
Medium |
23500462
|
| 2014 |
GOLPH3 promotes glioblastoma cell migration and invasion via the mTOR-YB1 pathway; knockdown of GOLPH3 decreases YB1 levels and mTOR activity, and overexpression-induced migration is blocked by mTOR inhibition (INK128) or YB1 knockdown, placing mTOR and YB1 downstream of GOLPH3 in this pathway. |
siRNA knockdown, overexpression, mTOR inhibitor epistasis, YB1 knockdown epistasis, migration/invasion assays |
Molecular carcinogenesis |
Medium |
25156912
|
| 2018 |
GOLPH3 promotes JAK2-STAT3 pathway activation in glioma by acting as a scaffold protein; GOLPH3, JAK2, and STAT3 exist in the same protein complex (demonstrated by Co-IP), and GOLPH3 affects the interaction between JAK2 and STAT3. |
Co-immunoprecipitation, western blot for p-JAK2 and p-STAT3, overexpression and knockdown, STAT3 knockdown epistasis |
Journal of neuro-oncology |
Medium |
29713848
|
| 2020 |
GOLPH3 interacts with LC3B (confirmed by endogenous Co-IP in multiple cell lines) and acts as a novel cargo receptor for selective autophagy of the Golgi apparatus (Golgiphagy). Knockdown of GOLPH3 inhibits Golgiphagy. |
Co-immunoprecipitation (endogenous), immunofluorescence colocalization of Golgi markers with LC3B, transmission electron microscopy, GOLPH3 knockdown |
Life sciences |
Medium |
32335164
|
| 2020 |
GOLPH3 regulates EGFR glycosylation (sialylation and fucosylation) and ubiquitylation in glioblastoma T98G cells. GOLPH3 knockdown decreases EGFR sialylation and fucosylation, reduces ligand-induced EGFR autophosphorylation, delays ligand-induced EGFR downregulation, causes EGFR accumulation at endo-lysosomal compartments, and abolishes EGF-induced EGFR ubiquitylation. |
Stable RNAi knockdown, EGFR glycosylation analysis, ubiquitylation assay, surface EGFR quantification, ligand-induced trafficking assays |
International journal of molecular sciences |
Medium |
33238647
|
| 2022 |
Drosophila GOLPH3 (dGOLPH3) physically interacts with TCTP (Translationally controlled tumor protein) and 14-3-3ζ. dGOLPH3 knockdown reduces wing and eye size, and this phenotype is partially rescued by overexpression of Tctp, 14-3-3ζ, or Rheb. Golgi localization of Rheb in Drosophila cells depends on dGOLPH3. dGOLPH3 depletion reduces phosphorylated S6K (mTORC1 downstream target) and compromises autophagy flux. |
Co-IP for protein interactions, RNAi-mediated knockdown, genetic rescue assays, Rheb localization imaging, S6K phosphorylation western blot, autophagy flux assay |
Cell death & disease |
Medium |
36435842
|
| 2021 |
GOLPH3 interacts with cytoskeleton-associated protein 4 (CKAP4), decreases plasma membrane-localized CKAP4, and increases exosome-localized CKAP4, promoting formation of CKAP4-containing exosomes. CKAP4 then binds exosomal WNT3A to enhance its secretion, activating WNT/β-catenin signaling and promoting cancer stem-like phenotype and metastasis. |
Immunoprecipitation-mass spectrometry, Co-IP, CKAP4 membrane vs. exosome fractionation, WNT3A secretion assay, WNT/β-catenin reporter, in vivo metastasis models |
Cell death & disease |
Medium |
34671013
|
| 2020 |
GOLPH3 interacts with STIP1 (stress-inducible protein 1) and both are co-localized in pancreatic ductal adenocarcinoma. The GOLPH3-STIP1 interaction activates hTERT and telomerase activity via c-Myc, and upregulates cyclin D1, promoting tumor cell growth. |
High-throughput BiFC screen, Co-IP, immunohistochemistry colocalization, Q-TRAP telomerase assay, siRNA knockdown, xenograft model |
Frontiers in oncology |
Medium |
33134174
|
| 2024 |
GOLPH3 and GOLPH3L maintain the cis-Golgi localization of LYSET (TMEM251), an atypical client of GOLPH3/GOLPH3L. Loss of GOLPH3 and GOLPH3L destabilizes LYSET-GNPT complexes, impairs M6P-tagging of lysosomal hydrolases, and causes disturbed maturation and trafficking of lysosomal enzymes, establishing an essential role for GOLPH3/GOLPH3L in mannose 6-phosphate pathway integrity and lysosomal homeostasis. |
Knockout cell lines, fractionation, Co-IP, M6P-tagging assays, lysosomal enzyme maturation assays |
The EMBO journal |
High |
39587297
|
| 2021 |
In Drosophila, GOLPH3 interacts with the orthologs of Fragile X mental retardation protein (FMRP) and Ataxin-2 in testes, as identified by affinity purification coupled with mass spectrometry (AP-MS). The GOLPH3 interactome is enriched for proteins involved in vesicle-mediated trafficking, cell proliferation, and cytoskeleton dynamics. |
Affinity purification coupled with mass spectrometry (AP-MS) in Drosophila testes |
Cells |
Low |
34571985
|
| 2022 |
In high-glucose conditions, GOLPH3 interacts with Vimentin (demonstrated by GST-pulldown and Co-IP), and this interaction promotes Golgi dispersal. An upstream pathway (NLRP3/VPS35/GOLPH3) regulates this process; NLRP3 promotes VPS35-GOLPH3 interaction, and Golph3 knockout abolishes Vimentin upregulation and Golgi dispersal. |
GST-pulldown, Co-IP, genetic knockout, Golgi morphology assay |
Aging |
Low |
36378718
|
| 2021 |
GOLPH3 interacts with and recruits prohibitin-2 (PHB2), a mitophagy receptor, along with LC3-II, to promote autophagy in glioma. PHB2 knockdown abolishes the autophagy-promoting effect of GOLPH3 overexpression, placing PHB2 downstream of GOLPH3 in this pathway. |
Co-IP, siRNA knockdown epistasis, autophagy assays (LC3-II conversion, chloroquine inhibition), in vivo xenograft |
American journal of cancer research |
Low |
34094672
|