SEC13
Function
Functions as a component of the nuclear pore complex (NPC) and the COPII coat (PubMed:8972206). At the endoplasmic reticulum, SEC13 is involved in the biogenesis of COPII-coated vesicles (PubMed:8972206). Required for the exit of adipsin (CFD/ADN), an adipocyte-secreted protein from the endoplasmic reticulum (By similarity).
As a component of the GATOR2 complex, functions as an activator of the amino acid-sensing branch of the mTORC1 signaling pathway (PubMed:23723238, PubMed:25457612, PubMed:27487210, PubMed:35831510, PubMed:36528027). The GATOR2 complex indirectly activates mTORC1 through the inhibition of the GATOR1 subcomplex (PubMed:23723238, PubMed:27487210, PubMed:35831510, PubMed:36528027). GATOR2 probably acts as an E3 ubiquitin-protein ligase toward GATOR1 (PubMed:36528027). In the presence of abundant amino acids, the GATOR2 complex mediates ubiquitination of the NPRL2 core component of the GATOR1 complex, leading to GATOR1 inactivation (PubMed:36528027). In the absence of amino acids, GATOR2 is inhibited, activating the GATOR1 complex (PubMed:25457612, PubMed:26972053, PubMed:27487210). Within the GATOR2 complex, SEC13 and SEH1L are required to stabilize the complex (PubMed:35831510).
Sequence Similarities
Belongs to the WD repeat SEC13 family.
Cellular localization
- Cytoplasmic vesicle
- COPII-coated vesicle membrane
- Peripheral membrane protein
- Cytoplasmic side
- Endoplasmic reticulum membrane
- Peripheral membrane protein
- Cytoplasmic side
- Nucleus
- Nuclear pore complex
- Lysosome membrane
- In interphase, localizes at both sides of the NPC.
Alternative names
D3S1231E, SEC13A, SEC13L1, SEC13R, SEC13, Protein SEC13 homolog, GATOR2 complex protein SEC13, SEC13-like protein 1, SEC13-related protein