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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1987 Oct;84(20):7005–7008. doi: 10.1073/pnas.84.20.7005

Sequence of an intestinal cDNA encoding human gastric inhibitory polypeptide precursor.

J Takeda 1, Y Seino 1, K Tanaka 1, H Fukumoto 1, T Kayano 1, H Takahashi 1, T Mitani 1, M Kurono 1, T Suzuki 1, T Tobe 1, et al.
PMCID: PMC299217  PMID: 2890159

Abstract

Gastric inhibitory polypeptide (GIP) is a 42-amino acid hormone that stimulates insulin secretion in the presence of glucose. Complementary DNA clones encoding human GIP were isolated from a library prepared with RNA from duodenum. The predicted amino acid sequence indicates that GIP is derived by proteolytic processing of a 153-residue precursor, preproGIP. The GIP moiety is flanked by polypeptide segments of 51 and 60 amino acids at its NH2 and COOH termini, respectively. The former includes a signal peptide of about 21 residues and an NH2-terminal propeptide of 30 amino acids. GIP is released from the precursor by processing at single arginine residues. There is a region of nine amino acids in the COOH-terminal propeptide of the GIP precursor that has partial homology with a portion of chromogranin A as well as pancreastatin.

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Selected References

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