Coordination of Rho and Rac GTPase Function via p190B RhoGAP

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Coordination of Rho and Rac GTPase Function via p190B RhoGAP

The Rac GTPase regulates Rho signaling in a broad range of physiological settings and in oncogenic transformation [1-3]. Here, we report a novel mechanism by which crosstalk between Rac and Rho GTPases is achieved. Activated Rac1 binds directly to p190B Rho GTPase-activating protein (RhoGAP), a major modulator of Rho signaling. p190B colocalizes with constitutively active Rac1 in membrane ruffl...

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Rho GTPases are overexpressed and hyperactivated in many cancers, including breast cancer. Rho proteins, as well as their regulators and effectors, have been implicated in mitosis, and their altered expression promotes mitotic defects and aneuploidy. Previously, we demonstrated that p190B Rho GTPase activating protein (RhoGAP) deficiency inhibits ErbB2-induced mammary tumor formation in mice. H...

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The PAR-6 polarity protein regulates dendritic spine morphogenesis through p190 RhoGAP and the Rho GTPase.

The majority of excitatory synaptic transmission in the brain occurs at dendritic spines, which are actin-rich protrusions on the dendrites. The asymmetric nature of these structures suggests that proteins regulating cell polarity might be involved in their formation. Indeed, the polarity protein PAR-3 is required for normal spine morphogenesis. However, this function is independent of associat...

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A Tip-Localized RhoGAP Controls Cell Polarity by Globally Inhibiting Rho GTPase at the Cell Apex

BACKGROUND Highly elongated eukaryotic cells (e.g., neuronal axons, fungal hyphae, and pollen tubes) are generated through continuous apically restricted growth (tip growth), which universally requires tip-localized Rho GTPases. We used the oscillating pollen tube as a model system to determine the function and regulation of Rho GTPases in tip growth. Our previous work showed that the spatiotem...

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Rac and Rho

How were they discovered? The first Rho gene was discovered by mistake, in 1985, by a group trying to clone a homologue of the α subunit of human chorionic gonadotropin from the sea snail Aplysia. Using the Aplysia Rho sequence, three closely related mammalian genes were cloned, now called RhoA, RhoB and RhoC. Rac was first identified as a substrate for the C3 transferase that modifies Rho (alt...

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ژورنال

عنوان ژورنال: Current Biology

سال: 2008

ISSN: 0960-9822

DOI: 10.1016/j.cub.2008.09.019