Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

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Schmidt, W.E. et al.

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

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.[1]

References

Isolation and primary structure of tumor-derived peptides related to human pancreastatin and chromogranin A. Schmidt, W.E., Siegel, E.G., Kratzin, H., Creutzfeldt, W. Proc. Natl. Acad. Sci. U.S.A. (1988) [Pubmed]

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