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Molecular and Cellular Biology, October 2002, p. 6719-6725, Vol. 22, No. 19
0270-7306/02/$04.00+0     DOI: 10.1128/MCB.22.19.6719-6725.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Cdc42/Rac1-Mediated Activation Primes PAK2 for Superactivation by Tyrosine Phosphorylation

G. Herma Renkema,1 Kati Pulkkinen,1 and Kalle Saksela1,2*

Institute of Medical Technology,1 Department of Clinical Chemistry, Tampere University Hospital, FIN-33014 University of Tampere, Finland2

Received 18 January 2002/ Returned for modification 4 March 2002/ Accepted 5 July 2002

The involvement of p21-activated kinases (PAKs) in important cellular processes such as regulation of the actin skeleton morphology, transduction of signals controlling gene expression, and execution of programmed cell death has directed attention to the regulation of the activity of these kinases. Here we report that activation of PAK2 by p21 GTPases can be strongly potentiated by cellular tyrosine kinases. PAK2 became tyrosine phosphorylated in its N-terminal regulatory domain, where Y130 was identified as the major phosphoacceptor site. Tyrosine phosphorylation-mediated superactivation of PAK2 could be induced by overexpression of different Src kinases or by inhibiting cellular tyrosine phosphatases with pervanadate and could be blocked by the Src kinase inhibitor PP1 or by mutating the Y130 residue. Analysis of PAK2 mutants activated by amino acid changes in the autoinhibitory domain or the catalytic domain indicated that GTPase-induced conformational changes, rather than catalytic activation per se, rendered PAK2 a target for tyrosine phosphorylation. Thus, PAK activation represents a potentially important point of convergence of tyrosine kinase- and p21 GTPase-dependent signaling pathways.

* Corresponding author. Mailing address: Institute of Medical Technology, FIN-33014 University of Tampere, Finland. Phone: 358-3-215 7029. Fax: 358-3-215 8597. E-mail: kalle.saksela{at}uta.fi.

Molecular and Cellular Biology, October 2002, p. 6719-6725, Vol. 22, No. 19
0022-538X/02/$04.00+0     DOI: 10.1128/MCB.22.19.6719-6725.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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