Interaction of Activated Cdc42-associated Tyrosine Kinase ACK2 with HSP90

Overview

Journal Biochem J

Specialty Biochemistry

Date 2004 May 18

PMID 15144235

Citations 4

Authors

Wannian Yang

Jaclyn M Jansen

Qiong Lin

Sabrina Canova

Richard A Cerione

Chandra Childress

Affiliations

Soon will be listed here.

Abstract

ACK2 (activated Cdc42-associated tyrosine kinase 2) is a specific downstream effector for Cdc42, a member of the Rho family of small G-proteins. ACK2 interacts with clathrin, an endocytic vesicle coating protein, and SH3PX1, a sorting nexin, and is involved in clathrin-mediated endocytosis. While searching for proteins that interact with ACK2, we found that HSP90 (heat-shock protein 90) binds to ACK2. Analysis of a series of truncation mutants of ACK2 has defined the regions within the kinase domain of ACK2 that are required for binding to HSP90. The binding of HSP90 to ACK2 is blocked upon treatment with geldanamycin, an HSP90-specific ATPase inhibitor, and is required for the in vivo kinase activity of ACK2 and its association with Cdc42. Overall, our data suggest a novel mechanism of regulation in which HSP90 serves as a regulatory component in an ACK2 functional complex and plays a role in sustaining its kinase activity.

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