A novel form of the polypeptide PHI isolated in high yield from bovine upper intestine. Relationships to other peptides of the glucagon-secretin family - PubMed

Comparative Study

A novel form of the polypeptide PHI isolated in high yield from bovine upper intestine. Relationships to other peptides of the glucagon-secretin family

M Carlquist et al. Eur J Biochem. 1984.

Free article

Abstract

A novel form of the polypeptide termed PHI (peptide HI with N-terminal histidine and C-terminal isoleucine amide) has been isolated from bovine upper intestine. This bovine peptide was obtained in a 40 times higher yield than the corresponding polypeptide isolated from porcine intestine. Bovine PHI is, like porcine PHI, composed of 27 amino acid residues. The complete amino acid sequence of the bovine peptide is His-Ala-Asp-Gly-Val-Phe-Thr-Ser-Asp-Tyr-Ser-Arg-Leu-Leu-Gly-Gln-Leu-Ser- Ala- Lys-Lys-Tyr-Leu-Glu-Ser-Leu-Ile-NH2. This sequence differs from porcine PHI at position 10 and from human PHI at positions 10, 12 and 27. The amino acid residue exchange between porcine and bovine PHI makes the latter more similar to the vasoactive intestinal polypeptide (VIP), gastric inhibitory polypeptide (GIP), glucagon and the growth-hormone-releasing factor (GRF).

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