Cell adhesion kinase beta forms a complex with a new member, Hic-5, of proteins localized at focal adhesions.

The Journal of Biological Chemistry
M MatsuyaT Sasaki

Abstract

Cell adhesion kinase beta (CAKbeta/PYK2) is the second protein-tyrosine kinase of the focal adhesion kinase subfamily. We identified a cDNA that encodes a CAKbeta-binding protein. This cDNA clone encodes the human homologue of Hic-5, the cDNA of which was cloned in 1994 as transforming growth factor beta1- and hydrogen peroxide-inducible mRNA. We found that Hic-5 exclusively localized at focal adhesions in a rat fibroblast line, WFB. This localization of Hic-5 was confirmed in WFB cells expressing Myc-tagged Hic-5. The amino acid sequence of Hic-5 is highly similar to that of paxillin in the four LD motifs as well as in the four contiguous LIM domains. The Hic-5 N-terminal domain directly associated in vitro with the extreme C-terminal region (residue 801 to the end) of CAKbeta. CAKbeta was coimmunoprecipitated with Hic-5 from the WFB cell lysate. The coimmunoprecipitation of CAKbeta with Hic-5 was markedly inhibited by the addition of the extreme C-terminal region of CAKbeta. Coimmunoprecipitation of Hic-5 with CAKbeta, which was shown in COS-7 cells doubly transfected with cDNA constructs of CAKbeta and Myc-tagged Hic-5, was lost when the CAKbeta amino acid residues 741-903 were deleted. Hic-5 was tyrosine-phosphorylated in S...Continue Reading

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