Balancing Different Types of Actin Polymerization at Distinct Sites: Roles for Abelson Kinase and Enabled

Overview

Journal J Cell Biol

Specialty Cell Biology

Date 2003 Dec 17

PMID 14676307

Citations 67

Authors

Elizabeth E Grevengoed

Donald T Fox

Julie Gates

Mark Peifer

Affiliations

Soon will be listed here.

Abstract

The proto-oncogenic kinase Abelson (Abl) regulates actin in response to cell signaling. Drosophila Abl is required in the nervous system, and also in epithelial cells, where it regulates adherens junction stability and actin organization. Abl acts at least in part via the actin regulator Enabled (Ena), but the mechanism by which Abl regulates Ena is unknown. We describe a novel role for Abl in early Drosophila development, where it regulates the site and type of actin structures produced. In Abl's absence, excess actin is polymerized in apical microvilli, whereas too little actin is assembled into pseudocleavage and cellularization furrows. These effects involve Ena misregulation. In abl mutants, Ena accumulates ectopically at the apical cortex where excess actin is observed, suggesting that Abl regulates Ena's subcellular localization. We also examined other actin regulators. Loss of Abl leads to changes in the localization of the Arp2/3 complex and the formin Diaphanous, and mutations in diaphanous or capping protein beta enhance abl phenotypes.

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