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. 2002 Jun 28;109(7):873-85.
doi: 10.1016/s0092-8674(02)00800-0.

Rac1 and Cdc42 capture microtubules through IQGAP1 and CLIP-170

Masaki Fukata  1 , Takashi Watanabe, Jun Noritake, Masato Nakagawa, Masaki Yamaga, Shinya Kuroda, Yoshiharu Matsuura, Akihiro Iwamatsu, Franck Perez, Kozo Kaibuchi
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Free article

Rac1 and Cdc42 capture microtubules through IQGAP1 and CLIP-170

Masaki Fukata et al. Cell. .
Free article

Abstract

Linkage of microtubules to special cortical regions is essential for cell polarization. CLIP-170 binds to the growing ends of microtubules and plays pivotal roles in orientation. We have found that IQGAP1, an effector of Rac1 and Cdc42, interacts with CLIP-170. In Vero fibroblasts, IQGAP1 localizes at the polarized leading edge. Expression of carboxy-terminal fragment of IQGAP1, which includes the CLIP-170 binding region, delocalizes GFP-CLIP-170 from the tips of microtubules and alters the microtubule array. Activated Rac1/Cdc42, IQGAP1, and CLIP-170 form a tripartite complex. Furthermore, expression of an IQGAP1 mutant defective in Rac1/Cdc42 binding induces multiple leading edges. These results indicate that Rac1/Cdc42 marks special cortical spots where the IQGAP1 and CLIP-170 complex is targeted, leading to a polarized microtubule array and cell polarization.

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