gastrin / cholecystokinin / caerulein family
SMART accession number:SM00029
Description: This family gathers small proteins of about 100 130 amino acids that act as hormones, among them gastrin, cholecystokinin and preprocaerulein which stimulate gastric, biliary, and pancreatic secretion and smooth muscle contraction.
Interpro abstract (IPR001651): Gastrin and cholecystokinin (CCK) are structurally and functionally related peptide hormones that function as hormonal regulators of various digestive processes and feeding behaviors. They are known to induce gastric secretion, stimulate pancreatic secretion, increase blood circulation and water secretion in the stomach and intestine, and stimulate smooth muscle contraction. Originally found in the gut, these hormones have since been shown to be present in various parts of the nervous system. Like many other active peptides they are synthesized as larger protein precursors that are enzymatically converted to their mature forms. They are found in several molecular forms due to tissue-specific post-translational processing. The biological activity of gastrin and CCK is associated with the last five C-terminal residues. One or two positions downstream, there is a conserved sulphated tyrosine residue. The amphibian caerulein skin peptide, the cockroach leukosulphakinin I and II (LSK) peptides, Drosophila melanogaster (Fruit fly) putative CCK-homologues Drosulphakinins I and II, cionin, a Gallus gallus (Chicken) gastrin/cholecystokinin-like peptide and cionin, a neuropeptide from the protochordate Ciona intestinalis belong to the same family.
GO component:extracellular region (GO:0005576)
GO function:hormone activity (GO:0005179)
Family alignment:
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There are 209 GASTRIN domains in 200 proteins in SMART's nrdb database.

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