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. 1983 Apr 1;211(1):35–44. doi: 10.1042/bj2110035

The role of glandular kallikrein in the formation of a salivary proline-rich protein A by cleavage of a single bond in salivary protein C.

R S Wong, G Madapallimattam, A Bennick
PMCID: PMC1154326  PMID: 6553499

Abstract

An enzyme was purified from human parotid saliva that can cleave a single arginine-glycine peptide bond between residues 106 and 107 in human salivary proline-rich protein C, hereby giving rise to another proline-rich protein A, which is also found in saliva. The enzyme was purified 2400-fold. It cleaved salivary protein C at the rate of 59 micrograms of protein/h per microgram of enzyme and had amino acid composition, molecular weight and inhibition characteristics similar to those reported for human salivary kallikrein. Confirmation that the enzyme was kallikrein was demonstrated by its kinin-generating ability. Histochemical evidence indicates that a post-synthetic cleavage of protein C by kallikrein would have to take place during passage of saliva through the secretory ducts. In secreted saliva, cleavage of salivary protein C can only be observed after 72 h incubation. In addition, there is no effect of salivary flow rate on the relative amounts of proteins A and C in saliva. On the basis of the experimental observations, it is proposed that in vivo it is unlikely that kallikrein secreted from ductal cells plays a significant role in converting protein C into protein A.

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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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