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. 2004 Feb 6;279(6):4743-9.
doi: 10.1074/jbc.M310281200. Epub 2003 Nov 18.

Alternative splicing of Rac1 generates Rac1b, a self-activating GTPase

Dennis Fiegen  1 , Lars-Christian Haeusler, Lars Blumenstein, Ulrike Herbrand, Radovan Dvorsky, Ingrid R Vetter, Mohammad R Ahmadian
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Free article

Alternative splicing of Rac1 generates Rac1b, a self-activating GTPase

Dennis Fiegen et al. J Biol Chem. .
Free article

Abstract

Rac1b was recently identified in malignant colorectal tumors as an alternative splice variant of Rac1 containing a 19-amino acid insertion next to the switch II region. The structures of Rac1b in the GDP- and the GppNHp-bound forms, determined at a resolution of 1.75 A, reveal that the insertion induces an open switch I conformation and a highly mobile switch II. As a consequence, Rac1b has an accelerated GEF-independent GDP/GTP exchange and an impaired GTP hydrolysis, which is restored partially by GTPase-activating proteins. Interestingly, Rac1b is able to bind the GTPase-binding domain of PAK but not full-length PAK in a GTP-dependent manner, suggesting that the insertion does not completely abolish effector interaction. The presented study provides insights into the structural and biochemical mechanism of a self-activating GTPase.

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