SEC61A1
Function
Component of SEC61 channel-forming translocon complex that mediates transport of signal peptide-containing precursor polypeptides across the endoplasmic reticulum (ER) (PubMed:12475939, PubMed:22375059, PubMed:28782633, PubMed:29719251, PubMed:32814900). Forms a ribosome receptor and a gated pore in the ER membrane, both functions required for cotranslational translocation of nascent polypeptides (PubMed:22375059, PubMed:28782633, PubMed:29719251). May cooperate with auxiliary protein SEC62, SEC63 and HSPA5/BiP to enable post-translational transport of small presecretory proteins (PubMed:22375059, PubMed:29719251). The SEC61 channel is also involved in ER membrane insertion of transmembrane proteins: it mediates membrane insertion of the first few transmembrane segments of proteins, while insertion of subsequent transmembrane regions of multi-pass membrane proteins is mediated by the multi-pass translocon (MPT) complex (PubMed:32820719, PubMed:36261522). The SEC61 channel cooperates with the translocating protein TRAM1 to import nascent proteins into the ER (PubMed:8616892). Controls the passive efflux of calcium ions from the ER lumen to the cytosol through SEC61 channel, contributing to the maintenance of cellular calcium homeostasis (PubMed:28782633). Plays a critical role in nephrogenesis, specifically at pronephros stage (By similarity).
Involvement in disease
Tubulointerstitial kidney disease, autosomal dominant, 5
ADTKD5
A form of autosomal dominant tubulointerstitial kidney disease, a genetically heterogeneous disorder characterized by slowly progressive loss of kidney function, bland urinary sediment, hyperuricemia, absent or mildly increased albuminuria, lack of severe hypertension during the early stages, and normal or small kidneys on ultrasound. Renal histology shows variable abnormalities including interstitial fibrosis with tubular atrophy, microcystic dilatation of the tubules, thickening of tubular basement membranes, medullary cysts, and secondary glomerulosclerotic or glomerulocystic changes with abnormal glomerular tufting. There is significant variability, as well as incomplete penetrance.
None
The disease is caused by variants affecting the gene represented in this entry.
Immunodeficiency, common variable, 15
CVID15
An autosomal dominant immunologic disorder resulting in recurrent severe infections since early childhood or infancy, and characterized by hypogammaglobulinemia with antibody deficiencies of IgM, IgG, and IgA due to impaired plasma cell homeostasis, although other B cell subset numbers are normal. T and NK cells are also normal. CVID15 inheritance is autosomal dominant.
None
The disease is caused by variants affecting the gene represented in this entry.
Neutropenia, severe congenital, 11, autosomal dominant
SCN11
A form of severe congenital neutropenia, a disorder of hematopoiesis characterized by maturation arrest of granulopoiesis at the level of promyelocytes with peripheral blood absolute neutrophil counts below 0.5 x 10(9)/l, and early onset of severe bacterial infections. SCN11 is characterized by the onset of recurrent infections, mainly bacterial, in early childhood.
None
The disease may be caused by variants affecting the gene represented in this entry.
Sequence Similarities
Belongs to the SecY/SEC61-alpha family.
Tissue Specificity
Expressed in proximal and distal tubules in kidney (at protein level).
Cellular localization
- Endoplasmic reticulum membrane
- Multi-pass membrane protein
- Localizes exclusively in granular structures in the endoplasmic reticulum (ER).
Alternative names
SEC61A, SEC61A1, Protein transport protein Sec61 subunit alpha isoform 1, Sec61 alpha-1