RRC ID 47659
Author Wu J, Wang H, Guo X, Chen J.
Title Cofilin-mediated actin dynamics promotes actin bundle formation during Drosophila bristle development.
Journal Mol Biol Cell
Abstract The actin bundle is an array of linear actin filaments cross-linked by actin-bundling proteins, but its assembly and dynamics are not as well understood as those of the branched actin network. Here we used the Drosophila bristle as a model system to study actin bundle formation. We found that cofilin, a major actin disassembly factor of the branched actin network, promotes the formation and positioning of actin bundles in the developing bristles. Loss of function of cofilin or AIP1, a cofactor of cofilin, each resulted in increased F-actin levels and severe defects in actin bundle organization, with the defects from cofilin deficiency being more severe. Further analyses revealed that cofilin likely regulates actin bundle formation and positioning by the following means. First, cofilin promotes a large G-actin pool both locally and globally, likely ensuring rapid actin polymerization for bundle initiation and growth. Second, cofilin limits the size of a nonbundled actin-myosin network to regulate the positioning of actin bundles. Third, cofilin prevents incorrect assembly of branched and myosin-associated actin filament into bundles. Together these results demonstrate that the interaction between the dynamic dendritic actin network and the assembling actin bundles is critical for actin bundle formation and needs to be closely regulated.
Volume 27(16)
Pages 2554-64
Published 2016-8-15
DOI 10.1091/mbc.E16-02-0084
PII mbc.E16-02-0084
PMID 27385345
PMC PMC4985257
MeSH Actin Cytoskeleton / metabolism* Actin Depolymerizing Factors / metabolism Actins / genetics Actins / metabolism* Animals Cofilin 1 / genetics Cofilin 1 / metabolism* Drosophila / growth & development Drosophila / metabolism* Drosophila Proteins / genetics Drosophila Proteins / metabolism Female Male Microfilament Proteins / genetics Microfilament Proteins / metabolism Models, Biological
IF 3.791
Times Cited 7
Drosophila DGRC#109007