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Coatomer subunit alpha is a protein that in humans is encoded by the COPAgene.[4][5]
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Function
In eukaryotic cells, protein transport between the endoplasmic reticulum and Golgi compartments is mediated in part by non-clathrin-coated vesicular coat proteins (COPs). Seven coat proteins have been identified, and they represent subunits of a complex known as coatomer. The subunits are designated alpha-COP, beta-COP, beta-prime-COP, gamma-COP, delta-COP, epsilon-COP, and zeta-COP. The alpha-COP, encoded by COPA, shares high sequence similarity with RET1, the homologous alpha subunit of the coatomer complex in yeast.[6] Also, the N-terminal 25 amino acids of alpha-COP encode the bioactive peptide, xenin, which stimulates exocrine pancreatic secretion and may act as a gastrointestinal hormone. Alternative splicing results in multiple splice forms encoding distinct isoforms.[5]
^"Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
^"Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
^Chow VT, Quek HH (July 1996). "HEP-COP, a novel human gene whose product is highly homologous to the alpha-subunit of the yeast coatomer protein complex". Gene. 169 (2): 223–7. doi:10.1016/0378-1119(95)00738-5. PMID8647451.
^Stelzl U, Worm U, Lalowski M, Haenig C, Brembeck FH, Goehler H, Stroedicke M, Zenkner M, Schoenherr A, Koeppen S, Timm J, Mintzlaff S, Abraham C, Bock N, Kietzmann S, Goedde A, Toksöz E, Droege A, Krobitsch S, Korn B, Birchmeier W, Lehrach H, Wanker EE (September 2005). "A human protein-protein interaction network: a resource for annotating the proteome". Cell. 122 (6): 957–68. doi:10.1016/j.cell.2005.08.029. hdl:11858/00-001M-0000-0010-8592-0. PMID16169070. S2CID8235923.
Quek HH, Chow VT (1997). "Molecular and cellular studies of the human homolog of the 160-kD alpha-subunit of the coatomer protein complex". DNA Cell Biol. 16 (3): 275–80. doi:10.1089/dna.1997.16.275. PMID9115636.
Quek HH, Chow VT (1997). "Genomic organization and mapping of the human HEP-COP gene (COPA) to 1q". Cytogenet. Cell Genet. 76 (3–4): 139–43. doi:10.1159/000134532. PMID9186507.
Hansen K, Rönnstrand L, Rorsman C, et al. (1997). "Association of coatomer proteins with the beta-receptor for platelet-derived growth factor". Biochem. Biophys. Res. Commun. 235 (3): 455–60. doi:10.1006/bbrc.1997.6821. PMID9207175.
Chow VT, Quek HH (1997). "Alpha coat protein COPA (HEP-COP): presence of an Alu repeat in cDNA and identity of the amino terminus to xenin". Ann. Hum. Genet. 61 (Pt 4): 369–73. doi:10.1046/j.1469-1809.1997.6140369.x. PMID9365789. S2CID41227737.
Wong N, Chan A, Lee SW, et al. (2003). "Positional mapping for amplified DNA sequences on 1q21-q22 in hepatocellular carcinoma indicates candidate genes over-expression". J. Hepatol. 38 (3): 298–306. doi:10.1016/S0168-8278(02)00412-9. PMID12586295.