SGTA

This gene encodes a protein which is capable of interacting with the major nonstructural protein of parvovirus H-1 and 70-kDa heat shock cognate protein; however, its function is not known. Since this transcript is expressed ubiquitously in various tissues, this protein may serve a housekeeping function. [provided by RefSeq, Jul 2008]

Small Glutamine Rich Tetratricopeptide Repeat Containing Alpha

Co-chaperone that binds misfolded and hydrophobic patches-containing client proteins in the cytosol. Mediates their targeting to the endoplasmic reticulum but also regulates their sorting to the proteasome when targeting fails (PubMed:28104892).
Functions in tail-anchored/type II transmembrane proteins membrane insertion constituting with ASNA1 and the BAG6 complex a targeting module (PubMed:28104892).
Functions upstream of the BAG6 complex and ASNA1, binding more rapidly the transmembrane domain of newly synthesized proteins (PubMed:28104892, PubMed:25535373).
It is also involved in the regulation of the endoplasmic reticulum-associated misfolded protein catabolic process via its interaction with BAG6: collaborates with the BAG6 complex to maintain hydrophobic substrates in non-ubiquitinated states (PubMed:23129660, PubMed:25179605).
Competes with RNF126 for interaction with BAG6, preventing the ubiquitination of client proteins associated with the BAG6 complex (PubMed:27193484).
Binds directly to HSC70 and HSP70 and regulates their ATPase activity (PubMed:18759457).
(Microbial infection) In case of infection by polyomavirus, involved in the virus endoplasmic reticulum membrane penetration and infection via interaction with DNAJB12, DNAJB14 and HSPA8/Hsc70 (PubMed:24675744).

Negative regulation of ER-associated ubiquitin-dependent protein catabolic processManual Assertion Based On ExperimentIDA:UniProtKB
Negative regulation of ubiquitin-dependent protein catabolic processManual Assertion Based On ExperimentIDA:UniProtKB
Positive regulation of ER-associated ubiquitin-dependent protein catabolic processManual Assertion Based On ExperimentIMP:ParkinsonsUK-UCL
Posttranslational protein targeting to endoplasmic reticulum membraneManual Assertion Based On ExperimentIBA:GO_Central
Tail-anchored membrane protein insertion into ER membraneManual Assertion Based On ExperimentIDA:UniProtKB
Ubiquitin-dependent ERAD pathwayManual Assertion Based On ExperimentIDA:UniProtKB

Cytoplasm
Nucleus
Co-localizes with HSP90AB1 in the cytoplasm. Increased nuclear accumulation seen during cell apoptosis.