Source: PM19886704
Marked as 'Membrane associated protein'
Confidence: medium (present in either hRBCD or BSc_CH or PM22954596) Search PubMed for
(RBC AND this entry)

Gene names: COPA
Protein names and data: COPA_HUMAN , Coatomer subunit alpha , Alpha-coat protein; Alpha-COP; HEP-COP; HEPCOP; Xenin; Xenopsin-related peptide; Proxenin Lenght: 1224 a.a.
Mass: 138346 Da
fasta formatted sequence

Function: The coatomer is a cytosolic protein complex that binds to dilysine motifs and reversibly associates with Golgi non- clathrin-coated vesicles, which further mediate biosynthetic protein transport from the ER, via the Golgi up to the trans Golgi network. Coatomer complex is required for budding from Golgi membranes, and is essential for the retrograde Golgi-to-ER transport of dilysine-tagged proteins. In mammals, the coatomer can only be recruited by membranes associated to ADP-ribosylation factors (ARFs), which are small GTP-binding proteins; the complex also influences the Golgi structural integrity, as well as the processing, activity, and endocytic recycling of LDL receptors (By similarity). Xenin stimulates exocrine pancreatic secretion. It inhibits pentagastrin-stimulated secretion of acid, to induce exocrine pancreatic secretion and to affect small and large intestinal motility. In the gut, xenin interacts with the neurotensin receptor.
Cellular location: Cytoplasm (By similarity). Golgi apparatus membrane; Peripheral membrane protein; Cytoplasmic side (By similarity). Cytoplasmic vesicle, COPI-coated vesicle membrane; Peripheral membrane protein; Cytoplasmic side (By similarity). Note=The coatomer is cytoplasmic or polymerized on the cytoplasmic side of the Golgi, as well as on the vesicles/buds originating from it (By similarity). Xenin: Secreted (By similarity).
Tissue specificity: Uniformly expressed in a wide range of adult and fetal tissues. Xenin is found in gastric, duodenal and jejunal mucosa. Circulates in the blood. Seems to be confined to specific endocrine cells.

Genetic variants

Database cross-references

UniProt: P53621
Ensembl: ENST00000241704
Ensembl: ENST00000368069
MIM: 601924
neXtProt: NX_P53621
Antibodypedia: P53621 (may not find the protein thus also not any antibody)
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