Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10836893 | Peptides | 2005 | 10 Pages |
Abstract
The primary structures of two salivary proline-rich peptides (PRP-SP-A, M 6156.0Â amu and PRP-SP-B, M 1905.0Â amu), from pig (Sus scrofa) were determined. The PRP-SP-B peptide, 21 residues long, overlaps with a sequence repeated 43 times in three deposited cDNAs coding for PRP proteins cloned from porcine parotid glands (Swiss-Prot codes: Q95JC9, Q95JD1, Q95JD0). PRP-SP-A peptide, 56 amino acid residues long, overlaps with the N-terminus repeats of Q95JC9 and Q95JD1 and it is phosphorylated at Ser 12 and 14. The two peptides were found both in whole saliva and in granules from pig parotid glands. The biosynthesis of the two peptides implies the action of a proteinase responsible for ProâAla cleavage in the pre-secretory process.
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Authors
M. Patamia, I. Messana, R. Petruzzelli, A. Vitali, R. Inzitari, T. Cabras, C. Fanali, E. Scarano, A. Contucci, A. Galtieri, M. Castagnola,