Calphobindins (placental annexins) inhibit protein kinase C.

Abstract:

:Calphobindins (CPBs, placental annexins) are intracellular Ca(2+)- and phospholipid-dependent proteins like protein kinase C [EC 2.7.1.37]. We investigated the inhibitory effects of calphobindins on the protein kinase C activity in vitro. CPB I inhibited the protein kinase C activity for both histone phosphorylation and lipocortin phosphorylation, but CPB II and CPB III inhibited only the protein kinase C activity for histone phosphorylation. In the case of histone phosphorylation, all CPBs inhibited the protein kinase C activity in a concentration-dependent manner, and the IC50 (concentration required for 50% inhibition) value of CPB I was 70 nM. The inhibition of protein kinase C by CPB I was Ca(2+)-dependent, and did not disappear upon increasing the concentration of phosphatidyl-serine. Kinetic analysis by double-reciprocal plots indicated that CPB I interacted not only with phosphatidylserine but also with protein kinase C. Although CPB I partially interacts with phospholipid, it is conceivable that the inhibitory action of CPB I on protein kinase C results from direct interaction of CPB I with protein kinase C. Since CPBs are mainly present under the plasma membrane, it is presumed that CPB I is an endogenous inhibitor of protein kinase C, and according to intracellular circumstances, CPB II and CPB III may also be endogenous inhibitors.

journal_name

J Biochem

journal_title

Journal of biochemistry

authors

Shibata S,Sato H,Maki M

doi

10.1093/oxfordjournals.jbchem.a123937

keywords:

subject

Has Abstract

pub_date

1992-10-01 00:00:00

pages

552-6

issue

4

eissn

0021-924X

issn

1756-2651

journal_volume

112

pub_type

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