| 1989 |
Yeast SEC62 encodes a membrane protein required for post-translational translocation of secretory precursor proteins into the ER lumen; the defect is membrane-specific (not cytosolic), and the protein is predicted to have two transmembrane domains with cytoplasmic N- and C-terminal domains including a C-terminal basic amphipathic helix for protein–protein interactions. |
In vitro translocation assay with sec62 mutant membranes/cytosol fractionation; DNA sequence analysis |
The Journal of cell biology |
High |
2687286
|
| 2000 |
Mammalian Sec62 physically associates with Sec61 and Sec63 in a ribosome-free complex in the ER membrane, forming a mammalian counterpart of the yeast Sec61p–Sec62p–Sec63p post-translational translocation complex. |
Biochemical fractionation, co-immunoprecipitation, primary sequence homology analysis |
The Journal of biological chemistry |
High |
10799540
|
| 2010 |
Human Sec62 interacts with Sec63 (conserved from yeast) and additionally has gained the ability to interact with the ribosomal tunnel exit, supporting cotranslational protein transport into the ER—a function not present in yeast Sec62. |
Co-immunoprecipitation of Sec62 with ribosomes; interaction assays between Sec62 and Sec63 |
Molecular biology of the cell |
Medium |
20071467
|
| 2012 |
Silencing SEC62 in human cells specifically inhibits post-translational (but not co-translational) transport of signal-peptide-containing precursor proteins into the ER, demonstrating a substrate-specific role for Sec62 in mammalian post-translational translocation. |
siRNA knockdown in HeLa cells; in vitro translocation assay with semi-permeabilized cells |
Journal of cell science |
High |
22375059
|
| 2012 |
Mammalian Sec62-dependent translocation occurs post-translationally via the Sec61 translocon, requires ATP, and is specifically required for efficient secretion of small proteins (≤100 amino acids) with N-terminal signal sequences, serving as a fail-safe for the SRP pathway. |
SRP pathway impairment combined with SEC62 RNAi; in vitro translocation assays categorizing substrates by size |
Molecular biology of the cell |
High |
22648169
|
| 2012 |
Protein kinase CK2 phosphorylates human Sec63 at serine residues 574, 576, and 748, and this phosphorylation enhances Sec63 binding to Sec62, which is a prerequisite for a functional ER protein translocon. |
CK2 phosphorylation mapping with deletion mutants and peptide library; pull-down and co-immunoprecipitation assays |
Biochimica et biophysica acta |
Medium |
23287549
|
| 2013 |
Sec62 mediates membrane insertion and orientation of moderately hydrophobic signal anchor proteins in the ER; defects in Sec62 selectively reduce translocation of type II (N-in, C-out) membrane topology, indicating a role in regulating signal sequence orientation during early translocation. |
Yeast Sec62 mutant strains; systematic analysis of model proteins with varying hydrophobicity and topology |
The Journal of biological chemistry |
Medium |
23632075
|
| 2013 |
Sec62 protein directly and Ca2+-sensitively interacts with the Sec61 complex (major ER Ca2+ leak channel), and a Ca2+-binding motif in Sec62 is essential for this function; SEC62 silencing leads to elevated cytosolic Ca2+ and increased ER Ca2+ leakage, and Sec62 is required for tumor cell migration. |
Biacore surface plasmon resonance interaction analysis; Ca2+ imaging; siRNA depletion with migration assays; Ca2+-binding motif mutagenesis |
BMC cancer |
Medium |
24304694
|
| 2014 |
The Sec62–Sec63 complex in yeast facilitates translocation of the C-terminus of membrane proteins; mutations in the N-terminal cytosolic domain of Sec62 impair its interaction with Sec63 and cause defects in membrane insertion and C-terminal translocation of both single- and multi-spanning membrane proteins. |
Yeast Sec62 N-terminal domain mutants; co-IP to assess Sec62–Sec63 interaction; systematic analysis of single and multi-spanning membrane proteins |
Journal of cell science |
Medium |
25097231
|
| 2015 |
The SRP receptor (SRα) switches the Sec61 translocase from Sec62-dependent to SRP-dependent translocation by physically displacing Sec62 from Sec61; the charged linker region of SRα (between longin and GTPase domains) mediates this displacement. |
Truncation variants of SRα; crosslinking; in vitro translocation assays; co-immunoprecipitation |
Nature communications |
High |
26634806
|
| 2015 |
Sec62 and Sec63 are stabilized within the Sec61 translocon when the nascent polypeptide encounters a delay in translocation initiation (e.g., by passenger domain folding); the engaged nascent chain controls translocon composition, with Sec62/63-containing complexes forming when translocation initiation is slow. |
Ribosome-nascent chain complex isolation; co-immunoprecipitation of translocon components at defined translocation stages using model substrate preprolactin |
Molecular cell |
High |
25801167
|
| 2016 |
Sec62 acts as an ER-resident autophagy receptor (recovER-phagy receptor) during recovery from ER stress, selectively delivering excess ER components to the autolysosomal system; this function requires a conserved LC3-interacting region (LIR) in the C-terminal cytosolic domain of Sec62, which is dispensable for its protein translocation function. |
Live-cell imaging; loss-of-function studies; LIR motif mutagenesis; autophagy flux assays in ER stress recovery conditions |
Nature cell biology |
High |
27749824
|
| 2020 |
Human Sec62/Sec63-dependent ER import substrates share signal peptides with longer but less hydrophobic h-regions and lower C-region polarity; a slowly-gating signal peptide combined with a downstream positively-charged amino acid cluster is decisive for Sec62/Sec63 requirement, which may involve Sec62/Sec63 supporting Sec61-channel opening via direct interaction with the N-terminal cytosolic peptide of Sec61α or via BiP recruitment to ER-lumenal loop 7. |
Unbiased proteomics (in-cell protein import assay); siRNA knockdown; signal peptide mutagenesis; identification of 22 novel substrates |
The FEBS journal |
High |
32133789
|
| 2021 |
Cryo-EM structures of Sec61-Sec62-Sec63 complexes from S. cerevisiae and T. lanuginosus show that Sec62 and Sec63 activate Sec61 for post-translational translocation in a stepwise/hierarchical manner: Sec63 first partially opens the Sec61 lateral gate through cytosolic and luminal domain interactions, then Sec62 opens the translocation pore by displacing the plug domain; Sec62 may also prevent lipid invasion through the open lateral gate. |
Cryo-electron microscopy structure determination; molecular dynamics simulations; mutagenesis of Sec61–Sec63 interface residues |
Nature structural & molecular biology |
High |
33398175
|
| 2021 |
ATG9A acetylation status in the ER lumen controls induction of reticulophagy, and this requires ATG9A to engage SEC62 (as well as FAM134B) on the cytosolic side of the ER membrane. |
ATG9A interactome analysis in two mouse models of AT-1 dysregulation; co-immunoprecipitation |
iScience |
Medium |
33870132
|
| 2021 |
Sec62 promotes gastric cancer metastasis by binding to LC3II and activating autophagy via the PERK/ATF4 pathway, with concomitant FIP200/Beclin-1/Atg5 activation; autophagy blockage abolishes Sec62-driven cell migration and invasion. |
Co-immunoprecipitation of Sec62 with LC3II; Western blot for UPR/autophagy markers; transwell migration/invasion assays; xenograft models; autophagy inhibitor rescue experiments |
Cellular and molecular life sciences : CMLS |
Medium |
35165763
|
| 2021 |
SEC62 binds DDX3X, and DDX3X is essential for TLOC1/SEC62-induced oncogenic transformation (anchorage-independent growth); this interaction was identified by proteomic studies. |
Proteomic interaction studies (pulldown/MS); loss-of-function genetic screen; gain-of-function transformation assays |
Cancer discovery |
Medium |
23764425
|
| 2021 |
SEC62 binds β-catenin and inhibits its degradation by competitively disrupting the interaction between β-catenin and APC, thereby preventing assembly of the β-catenin destruction complex and activating Wnt/β-catenin signaling in colorectal cancer cells. |
GST pull-down; co-immunoprecipitation; Western blot for β-catenin destruction complex components; siRNA loss-of-function with phenotypic readouts |
Journal of experimental & clinical cancer research : CR |
Medium |
33858476
|
| 2022 |
SEC62 activates the MAPK/JNK signaling pathway, leading to ATF2-mediated transcriptional upregulation of the lncRNA UCA1, which promotes colorectal cancer metastasis; blocking or activating JNK suppresses or enhances Sec62-mediated metastasis. |
RNA sequencing; rescue experiments with JNK inhibitor/agonist; luciferase reporter assay; ChIP assay; transwell/wound healing assays |
Cell proliferation |
Medium |
36200182
|
| 2022 |
Molecular dynamics simulations starting from cryo-EM structures show that the presence of Sec62 alters the conformational dynamics of the Sec61 lateral gate, plug, and pore region; without Sec62, the luminal side of the lateral gate closes toward the apo state, while with Sec62 bound it adopts a wider (active) conformation. |
Molecular dynamics simulations based on cryo-EM structures of Sec61 with/without Sec62 |
Biochimica et biophysica acta. Biomembranes |
Low |
36116515
|
| 2025 |
SEC62 directly interacts with TRPM4 and promotes TRPM4 ubiquitination and proteasomal degradation; the compound cinobufagin binds SEC62 and disrupts the SEC62–TRPM4 interaction, thereby stabilizing TRPM4 and inducing necrosis by sodium overload in bortezomib-resistant myeloma cells. |
LiP-MS, molecular docking, MST and CETSA target engagement assays; SPR for SEC62–TRPM4 interaction; immunoprecipitation for ubiquitination; SEC62 knockdown validation |
Phytomedicine |
Medium |
40839992
|
| 2025 |
SEC62-dependent ER-phagy in vascular endothelial cells promotes monocyte–endothelial cell adhesion and atherosclerosis; apelin-13 upregulates SEC62 to induce ER-phagy, and vascular endothelial cell-specific SEC62 deletion reduces atherosclerotic plaques in APOE-/- mice. Mechanistically, UBL4A mediates ubiquitin-like modification of ALDH1L1 at lysine-812, promoting ALDH1L1 insertion into the ER membrane and SEC62-dependent ER-phagy. |
siRNA knockdown; cell-specific knockout in APOE-/- mice with high-fat diet; co-immunoprecipitation; ubiquitination assay with lysine mutant |
Acta pharmacologica Sinica |
Medium |
39930135
|
| 2026 |
SEC62 at mitochondria-associated membranes (MAMs) interacts directly with ATAD3B and suppresses ATAD3B expression, causing defective mitophagy, increased mitochondrial ROS, and inflammation, thereby driving MASH progression; hepatocyte-specific SEC62 overexpression worsens and SEC62 knockout ameliorates MASH phenotypes. |
Co-immunoprecipitation (SEC62–ATAD3B interaction); hepatocyte-specific KO and overexpression mouse models; mitophagy and ROS assays |
Metabolism: clinical and experimental |
Medium |
42001994
|
| 2026 |
SEC62-mediated ER-phagy is deficient in Alzheimer's disease neurons; AAV-driven overexpression of SEC62 in 5×FAD mouse brains reduces Aβ plaque deposition, neuroinflammation, and cognitive impairment, establishing SEC62 ER-phagy as a mechanism for ER quality control relevant to AD pathology. |
Intrathecal AAV injection in 5×FAD mice; behavioral assays; immunostaining for Aβ and neuroinflammation markers; iPSC-derived neurons from AD patients |
Molecular therapy |
Medium |
42026868
|
| 2024 |
The intrinsically disordered regions (IDRs) of SEC62 exposed at the cytoplasmic face of the ER membrane (not its transmembrane domains) drive ER fragmentation during ER-phagy; the transmembrane domains determine sub-compartmental distribution but are dispensable for fragmentation. |
Domain swap experiments; live-cell imaging of ER fragmentation; loss-of-function and gain-of-function constructs for IDR and transmembrane domains |
bioRxivpreprint |
Low |
bio_10.1101_2024.06.18.599470
|