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J. Biol. Chem., Vol. 262, Issue 35, 17026-17030, 12, 1987

The primary structure of human chromogranin A and pancreastatin

DS Konecki, UM Benedum, HH Gerdes and WB Huttner
Cell Biology Programme, European Molecular Biology Laboratory, Heidelberg, Federal Republic of Germany.

A full-length clone encoding human chromogranin A has been isolated from a lambda gt10 cDNA library of a human pheochromocytoma. The nucleotide sequence reveals that human chromogranin A is a 439-residue protein preceded by an 18-residue signal peptide. Comparison of the protein sequence of human chromogranin A with that of bovine chromogranin A shows high conservation of the NH2-terminal and COOH- terminal domains as well as the potential dibasic cleavage sites, whereas the middle portion shows remarkable sequence variation (36%). This part of human chromogranin A contains a sequence homologous to porcine pancreastatin at residues 250-301. The sequence variation in this part of human chromogranin A compared to porcine pancreastatin is 32% and thus of the same magnitude as that between human and bovine chromogranin A. Therefore, the difference between porcine pancreastatin and the corresponding portions of bovine or human chromogranin A can be explained by species variation, suggesting that pancreastatin is derived from chromogranin A itself rather than a protein that is only similar to chromogranin A. Moreover, the pancreastatin sequence contained in human chromogranin A is flanked by sites for proteolytic processing. Together, these observations suggest that human chromogranin A may be the precursor for a human pancreastatin molecule and possibly for other, as yet unidentified, biologically active peptides.
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