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The complete amino acid sequence of porcine gastrotropin, an ileal protein which stimulates gastric acid and pepsinogen secretion


The complete amino acid sequence of porcine gastrotropin, an ileal protein which stimulates gastric acid and pepsinogen secretion



Journal of Biological Chemistry 263(28): 14189-14195



ISSN/ISBN: 0021-9258

PMID: 3049572

The stomach is stimulated by an enterooxyntin factor in a delayed response to feeding, resulting in an increase in both gastric acid and pepsinogen secretion. We have previously reported on the identity of such a factor from the porcine ileum (Wider, M. D., Vinik, A. I., and Heldsinger, A. (1984) Endocrinology 115, 1484-1491). This protein, termed gastrotropin, is localized to the distal region of the ileum where it constitutes less than 0.1% of the cytosolic protein. We have completed the primary structure of porcine gastrotropin by Edman degradation and mass spectrometry. Gastrotropin (Mr = 14,054) contains 127 amino acid residues and has a blocked (acetylated) alanine at its NH2 terminus. The sequence of porcine gastrotropin is similar to rat liver fatty acid-binding protein (FABP), with 44 of 127 residues being identical (35%). Homology with other members of the FABP family is significantly less apparent, with the order of similarity being liver FABP greater than heart FABP greater than retinol-binding protein greater than intestine FABP. The sequences of the NH2-terminal regions of these proteins account for virtually all of the homology; there are 9 conserved residues common to all five proteins. Gastrotropin represents the first member of the FABP family which has an extracellular function.

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Accession: 007878875

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