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Molecular and Cellular Biology, April 2002, p. 2751-2760, Vol. 22, No. 8
0270-7306/02/$04.00+0     DOI: 10.1128/MCB.22.8.2751-2760.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Structural Insight into the Mechanisms of Targeting and Signaling of Focal Adhesion Kinase

Gaohua Liu,1 Cristina D. Guibao,1 and Jie Zheng1,2*

Department of Structural Biology, St. Jude Children's Research Hospital, Memphis, Tennessee 38105,1 Department of Molecular Sciences, University of Tennessee Health Science Center, Memphis, Tennessee 381632

Received 27 November 2001/ Returned for modification 15 January 2002/ Accepted 23 January 2002

Focal adhesion kinase (FAK) is a nonreceptor tyrosine kinase whose focal adhesion targeting (FAT) domain interacts with other focal adhesion molecules in integrin-mediated signaling. Localization of activated FAK to focal adhesions is indispensable for its function. Here we describe a solution structure of the FAT domain bound to a peptide derived from paxillin, a FAK-binding partner. The FAT domain is composed of four helices that form a "right-turn" elongated bundle; the globular fold is mainly maintained by hydrophobic interactions. The bound peptide further stabilizes the structure. Certain signaling events such as phosphorylation and molecule interplay may induce opening of the helix bundle. Such conformational change is proposed to precede departure of FAK from focal adhesions, which starts focal adhesion turnover.


* Corresponding author. Mailing address: Department of Structural Biology, MS 311, St. Jude Children's Research Hospital, 332 N. Lauderdale, Memphis, TN 38103. Phone: (901) 495-3168. Fax: (901) 495-3032. E-mail: Jie.Zheng{at}stjude.org.


Molecular and Cellular Biology, April 2002, p. 2751-2760, Vol. 22, No. 8
0022-538X/02/$04.00+0     DOI: 10.1128/MCB.22.8.2751-2760.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.




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