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Endocrinology, Vol 122, 2339-2341, Copyright © 1988 by Endocrine Society

ARTICLES

The sequence of porcine chromogranin A messenger RNA demonstrates chromogranin A can serve as the precursor for the biologically active hormone, pancreastatin

AL Iacangelo, R Fischer-Colbrie, KJ Koller, MJ Brownstein and LE Eiden
Unit on Molecular and Cellular Neurobiology, NIMH, Bethesda, MD 20892.

Specific oligonucleotide priming of double-stranded DNA has been employed to sequence a porcine chromogranin A adrenomedullary cDNA. Porcine chromogranin A is more than 80% identical to human, bovine, and rat chromogranin A at its deduced N- and C-termini. A 49-amino acid region of the porcine molecule is 59-71% homologous to corresponding areas of rat, bovine, and human chromogranin A, and identical to the amino acid sequence of porcine pancreastatin. The sequence is preceded by an arginine at the N-terminus and followed by a GKR sequence at the C-terminus. Thus, porcine chromogranin A can serve as the precursor for pancreastatin, a polypeptide capable of inhibiting insulin release from the endocrine pancreas and acid secretion from parietal cells of the gut.




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Copyright © 1988 by The Endocrine Society