Sar1b - secretion associated Ras related GTPase 1B (house mouse)
Gene
Symbol
Taxonomy
Dates
- Create:2016-09-14
- Modify:2025-01-29
Description
Predicted to enable G protein activity and amino acid sensor activity. Involved in lipid export from cell and lipoprotein transport. Predicted to be located in cytosol. Predicted to be part of COPII vesicle coat. Predicted to be active in endoplasmic reticulum exit site and lysosomal membrane. Is expressed in cerebral cortex intermediate zone; cerebral cortex subventricular zone; cerebral cortex ventricular layer; cortical plate; and cortical preplate. Used to study chylomicron retention disease. Human ortholog(s) of this gene implicated in chylomicron retention disease. Orthologous to human SAR1B (secretion associated Ras related GTPase 1B).
- 2310075M17Rik
- 2900019I22Rik
- CMRD
- Sara1b
- Sara2
- Sarb
- small COPII coat GTPase SAR1B
- GTP-binding protein SAR1b
- SAR1 gene homolog B
- SAR1a gene homolog 2
- SAR1b gene homolog
Small GTPase that cycles between an active GTP-bound and an inactive GDP-bound state and mainly functions in vesicle-mediated endoplasmic reticulum (ER) to Golgi transport. The active GTP-bound form inserts into the endoplasmic reticulum membrane where it recruits the remainder of the coat protein complex II/COPII. The coat protein complex II assembling and polymerizing on endoplasmic reticulum membrane is responsible for both the sorting of cargos and the deformation and budding of membranes into vesicles destined to the Golgi (By similarity). In contrast to SAR1A, SAR1B specifically interacts with the cargo receptor SURF4 to mediate the transport of lipid-carrying lipoproteins including APOB and APOA1 from the endoplasmic reticulum to the Golgi and thereby, indirectly regulates lipid homeostasis (PMID: 33186557). In addition to its role in vesicle trafficking, can also function as a leucine sensor regulating TORC1 signaling and more indirectly cellular metabolism, growth and survival. In absence of leucine, interacts with the GATOR2 complex via MIOS and inhibits TORC1 signaling. The binding of leucine abrogates the interaction with GATOR2 and the inhibition of the TORC1 signaling. This function is completely independent of the GTPase activity of SAR1B (By similarity).
Highly accurate protein structure prediction with AlphaFold. Nature. 2021 Aug;596(7873):583-589. DOI:10.1038/s41586-021-03819-2. PMID:34265844; PMCID:PMC8371605
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