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J Biol Chem, Vol. 274, Issue 32, 22393-22400, August 6, 1999
From the The p21-activated kinases (Pak) are major targets
of the small GTPases Cdc42 and Rac. We, and others, recently identified a family of proteins termed Cool/Pix, which interact with Pak3. In
cells, p50Cool-1 suppresses Pak activation by
upstream activators; p85Cool-1 has a permissive effect on
Pak activation, and we now show that the closely related Cool-2
stimulates Pak kinase activity. To understand the differential
regulation of Pak by Cool proteins, we screened for Cool-interacting
proteins by affinity purification and microsequencing. This has led to
the identification of two closely related proteins called Cat
(Cool-associated, tyrosine phosphorylated), which contain a zinc finger followed by three ankyrin
repeats. Cat-1 is identical to the recently identified binding partner
for the
A Tyrosine-phosphorylated Protein That Binds to an Important
Regulatory Region on the Cool Family of p21-activated
Kinase-binding Proteins
,
,
,
,
, and
Department of Molecular Medicine,
Section of Biochemistry, Molecular and Cell Biology, Cornell
University, Ithaca, New York 14853-6401, § Onyx
Pharmaceuticals, Richmond, California 94806, and the
¶ Department of Medicine, Duke University Medical Center,
Durham, North Carolina 27710
-adrenergic receptor kinase (
ARK or GRK-2), which was
shown to have Arf-GAP activity. Cat-1 and Cat-2 both bind to the
COOH-terminal region of p85Cool-1 and p85Cool-2
but do not bind to p50Cool-1. Cat-1 is
tyrosine-phosphorylated in growing NIH 3T3 fibroblasts, and its
tyrosine phosphorylation is increased following cell spreading on
fibronectin, decreased in cells arrested in mitosis, and increased in
the ensuing G1 phase. Cat proteins are
tyrosine-phosphorylated when co-expressed in cells with the focal
adhesion kinase Fak and Src. These findings suggest that in addition to
playing a role in Cool/Pak interactions, Cat proteins may serve
as points of convergence between G protein-coupled receptors,
integrins, Arf GTPases, cell cycle regulators, and Cdc42/Rac/Pak
signaling pathways.
Copyright © 1999 by The American Society for Biochemistry and Molecular Biology, Inc.
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