Formins Determine the Functional Properties of Actin Filaments in Yeast

Johnson, Matthew and East, Daniel A. and Mulvihill, Daniel P. (2014) Formins Determine the Functional Properties of Actin Filaments in Yeast. Current Biology, 24 (13). pp. 1525-1530. ISSN 0960-9822. E-ISSN 1879-0445. (doi:https://doi.org/10.1016/j.cub.2014.05.034) (Full text available)

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http://dx.doi.org/10.1016/j.cub.2014.05.034

Abstract

The actin cytoskeleton executes a broad range of essential functions within a living cell. The dynamic nature of the actin polymer is modulated to facilitate specific cellular processes at discrete locations by actin-binding proteins (ABPs), including the formins and tropomyosins (Tms). Formins nucleate actin polymers, while Tms are conserved dimeric proteins that form polymers along the length of actin filaments. Cells possess different Tm isoforms, each capable of differentially regulating the dynamic and func- tional properties of the actin polymer. However, the mecha- nism by which a particular Tm localizes to a specific actin polymer is unknown. Here we show that specific formin family members dictate which Tm isoform will associate with a particular actin filament to modulate its dynamic and functional properties at specific cellular locations. Exchanging the localization of the fission yeast formins For3 and Cdc12 results in an exchange in localizations of Tm forms on actin polymers. This nucleator-driven switch in filament composition is reflected in a switch in actin dynamics, together with a corresponding change in the filament’s ability to regulate ABPs and myosin motor activity. These data establish a role for formins in dictating which specific Tm variant will associate with a growing actin filament and therefore specify the functional capacity of the actin filaments that they create.

Item Type: Article
Subjects: Q Science > QH Natural history > QH301 Biology
Q Science > QH Natural history > QH426 Genetics
Q Science > QR Microbiology
Divisions: Faculties > Sciences > School of Biosciences
Depositing User: Dan Mulvihill
Date Deposited: 23 Jun 2014 15:07 UTC
Last Modified: 10 Feb 2016 14:09 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/41502 (The current URI for this page, for reference purposes)
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