Nat Struct Biol. 2000 May;7(5):384-8.

Structure of Cdc42 bound to the GTPase binding domain of PAK.

Morreale A, Venkatesan M, Mott HR, Owen D, Nietlispach D, Lowe PN, Laue ED.

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Cambridge Centre for Molecular Recognition, Department of Biochemistry, University of Cambridge, 80 Tennis Court Road, Cambridge CB2 1GA, UK.

Abstract

The Rho family GTPases, Cdc42, Rac and Rho, regulate signal transduction pathways via interactions with downstream effector proteins. We report here the solution structure of Cdc42 bound to the GTPase binding domain of alphaPAK, an effector of both Cdc42 and Rac. The structure is compared with those of Cdc42 bound to similar fragments of ACK and WASP, two effector proteins that bind only to Cdc42. The N-termini of all three effector fragments bind in an extended conformation to strand beta2 of Cdc42, and contact helices alpha1 and alpha5. The remaining residues bind to switches I and II of Cdc42, but in a significantly different manner. The structure, together with mutagenesis data, suggests reasons for the specificity of these interactions and provides insight into the mechanism of PAK activation.

PMID:: 10802735; [PubMed - indexed for MEDLINE]

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PDB/1E0A

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Structures reported by this article

Cdc42 Complexed With The Gtpase Binding Domain Of P21 Activated Kinase

PDB: 1E0A

Source: Homo sapiens, Rattus norvegicus

Method: Nmr, 20 Structures

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