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Journal of Dental Research
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Phosphorylation of Salivary Proteins by Salivary Gland Protein Kinase

G. Madapallimattam

Department of Biochemistry, University of Toronto, Toronto, Ontario, Canada M5S 1A8

A. Bennick

Department of Biochemistry, University of Toronto, Toronto, Ontario, Canada M5S 1A8

Human saliva contains a number of phosphorylated acidic proline-rich proteins (APRP). Monkey parotid saliva contains a similar protein with the same phosphorylated sequences as the human proteins. A crude protein kinase was prepared from Macaca fascicularis parotid glands which phosphorylated human APRP. The enzyme was activated by Mg2+, it had a pH optimum between pH 7.0 and 7.5, the Km for ATP was 78 µmol/L, and for APRP it was 85 µmol/L. Phosphorylation of APRP was independent of cAMP and calmodulin. Phosphate was incorporated as phosphoserine, and the kinase phosphorylated the same residues in dephosphorylated APRP which are phosphorylated in the secreted protein. In addition, the enzyme preparation also phosphorylated dephosphorylated and native APRP in a region which is not phosphorylated in the secreted protein. There was no difference in the rate of phosphorylation of APRPs and their tryptic peptides. The kinase also phosphorylated other dephosphorylated salivary phosphoproteins. An enzyme was demonstrated in the human salivary gland which gave the same pattern of phosphorylation of APRP as did the simian kinase. More than one kinase may be necessary for the observed phosphorylation.

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Journal of Dental Research, Vol. 65, No. 3, 405-411 (1986)
DOI: 10.1177/00220345860650030601
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