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. 1988 Nov;85(21):8231–8235. doi: 10.1073/pnas.85.21.8231

Isolation and primary structure of tumor-derived peptides related to human pancreastatin and chromogranin A.

W E Schmidt 1, E G Siegel 1, H Kratzin 1, W Creutzfeldt 1
PMCID: PMC282403  PMID: 3186720

Abstract

Using an antiserum raised against a synthetic C-terminal peptide of porcine pancreastatin, we detected pancreastatin-like immunoreactivity (PLI) in human pancreatic islets, adrenal medulla, and endocrine tumors. From a carcinoid liver metastasis, human PLI was extracted and purified by HPLC. Two C-terminally amidated peptides were isolated and characterized by sequence analysis. The first peptide, hCgA-210-301, consists of 92 amino acid residues with glycinamide as C terminus. It is identical to the cDNA-derived sequence of human chromogranin A, positions 210-301, which is preceded by two basic residues indicating a putative processing site. The C-terminal part, positions 250-301, shows 70% sequence identity to porcine pancreastatin and represents the human pancreastatin-like sequence. The second peptide, hCgA-273-301, represents a C-terminally amidated fragment of the human pancreastatin sequence, generated by an Asp-Pro cleavage at the N terminus. Peptide hCgA-273-301 was synthesized to confirm the structure of the natural peptide. Two other peptides derived from human chromogranin A were isolated and partially characterized. They are generated by proteolytic cleavage after dibasic amino acids Lys-Arg (positions 338-339) and after Trp-376 of the human chromogranin A sequence, respectively. These results indicate that chromogranin A may represent the precursor for pancreastatin-related and possibly other yet-unidentified peptides of unknown physiological function.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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