GTP-binding protein SAR1b

UniProtKB accession:  Q9QVY3

Grouped By:  Matching UniProtKB accession

UniProtKB description:  GTP-binding protein involved in transport from the endoplasmic reticulum to the Golgi apparatus (PubMed:11149932, PubMed:8138575). Activated by the guanine nucleotide exchange factor PREB (PubMed:11149932, PubMed:8138575). Involved in the selection of the protein cargo and the assembly of the COPII coat complex (PubMed:11149932, PubMed:8138575). Synergizes with the cargo receptor SURF4 to mediate the export of lipoproteins from the endoplasmic reticulum, thereby regulating lipoprotein delivery and the maintenance of lipid homeostasis (By similarity).