RhoD Inhibits RhoC-ROCK-Dependent Cell Contraction Via PAK6

Overview

Journal Dev Cell

Publisher Cell Press

Specialties Cell Biology
Reproductive Medicine

Date 2017 May 10

PMID 28486133

Citations 18

Authors

Charlotte H Durkin

Flavia Leite

Joao V Cordeiro

Yutaka Handa

Yoshiki Arakawa

Ferran Valderrama

Michael Way

Affiliations

Soon will be listed here.

Abstract

RhoA-mediated regulation of myosin-II activity in the actin cortex controls the ability of cells to contract and bleb during a variety of cellular processes, including cell migration and division. Cell contraction and blebbing also frequently occur as part of the cytopathic effect seen during many different viral infections. We now demonstrate that the vaccinia virus protein F11, which localizes to the plasma membrane, is required for ROCK-mediated cell contraction from 2 hr post infection. Curiously, F11-induced cell contraction is dependent on RhoC and not RhoA signaling to ROCK. Moreover, RhoC-driven cell contraction depends on the upstream inhibition of RhoD signaling by F11. This inhibition prevents RhoD from regulating its downstream effector Pak6, alleviating the suppression of RhoC by the kinase. Our observations with vaccinia have now demonstrated that RhoD recruits Pak6 to the plasma membrane to antagonize RhoC signaling during cell contraction and blebbing.

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