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A short sequence responsible for both phosphoinositide binding and actin binding activities of cofilin
Ist Teil von
The Journal of biological chemistry, 1991-09, Vol.266 (26), p.17218-17221
Ort / Verlag
Bethesda, MD: American Society for Biochemistry and Molecular Biology
Erscheinungsjahr
1991
Quelle
MEDLINE
Beschreibungen/Notizen
Cofilin is a widely distributed actin-modulating protein that has abilities to bind along the side of F-actin and to depolymerize
F-actin. Both abilities of cofilin can be inhibited by phosphoinositides such as phosphatidylinositol, phosphatidylinositol
4-monophosphate, and phosphatidylinositol 4,5-bisphosphate (PIP2). We have previously shown that the synthetic dodecapeptide
corresponding to Trp104-Met115 of cofilin is a potent inhibitor of actin polymerization (Yonezawa, N., Nishida, E., Iida,
K., Kumagai, H., Yahara, I., and Sakai, H. (1991) J. Biol. Chem. 266, 10485-10489). In this study, we have found that the
inhibitory effect of the synthetic dodecapeptide on actin polymerization is canceled specifically by phosphatidylinositol,
phosphatidylinositol 4-monophosphate and PIP2. We further show that the dodecapeptide as well as cofilin binds to PIP2 molecules
and inhibits PIP2 hydrolysis by phospholipase C. Thus, the actin-binding dodecapeptide sequence of cofilin may constitute
a multifunctional domain in cofilin.