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Journal of Cell Science, Vol 106, Issue 4 1211-1220, Copyright © 1993 by Company of Biologists

JOURNAL ARTICLES

Protein kinase C-dependent phosphorylation of a ciliary membrane protein and inhibition of ciliary beating

M Salathe, MM Pratt and A Wanner
Pulmonary Division (D-60), University of Miami School of Medicine, Florida 33136.

The present study examined whether protein kinase C phosphorylated a ciliary protein and whether this phosphorylation event was temporally correlated with a decrease in ciliary beat frequency. Activation of protein kinase C decreased ciliary beat frequency of sheep tracheal epithelium, an effect fully blockable by pretreatment of the tissue pieces with H-7, a protein kinase inhibitor. Using cilia removed from these epithelial surfaces and incubated in solutions containing stimulators of protein kinase C along with [gamma-32P]ATP or [gamma-35S]ATP, a single protein target of ciliary protein kinase C activity was identified. The protein is a polypeptide of molecular mass 37 kDa (p37) as estimated by SDS-polyacrylamide gel electrophoresis. Protein kinase C dependency of p37 phosphorylation was proven by showing that Calphostin C, a specific protein kinase C inhibitor, blocked label incorporation into p37 completely, and by demonstrating that purified protein kinase C phosphorylated p37. Inhibitors of cAMP-dependent kinase and calcium/calmodulin-dependent kinase did not change the phosphorylation of p37 in the presence of protein kinase C activators. p37 was recovered in a Triton X-100-extractable fraction of this ciliary preparation, suggesting that p37 is membrane associated. This hypothesis was further supported by the fact that p37 was present in a pellet representing reconstituted membranes. Thin-layer electrophoresis revealed that p37 was phosphorylated on serine and tyrosine residues, suggesting that the activation of protein kinase C also stimulated tyrosine kinase activity. p37 did not precipitate with annexin I or II antibodies. These results show that sheep tracheal cilia contain protein kinase C activity and that activated protein kinase C phosphorylates a membrane-associated ovine ciliary target, an effect temporally related to a protein kinase C-mediated decrease in ciliary beat frequency.


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© The Company of Biologists Ltd 1993