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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Association of mouse actin-binding protein 1 (mAbp1/SH3P7), an Src kinase target, with dynamic regions of the cortical actin cytoskeleton in response to Rac1 activation.

Yeast Abp1p is a cortical actin cytoskeleton protein implicated in cytoskeletal regulation, endocytosis, and cAMP-signaling. We have identified a gene encoding a mouse homologue of Abp1p, and it is identical to SH3P7, a protein shown recently to be a target of Src tyrosine kinases. Yeast and mouse Abp1p display the same domain structure including an N-terminal actin-depolymerizing factor homology domain and a C-terminal Src homology 3 domain. Using two independent actin-binding domains, mAbp1 binds to actin filaments with a 1:5 saturation stoichiometry. In stationary cells, mAbp1 colocalizes with cortical F-actin in fibroblast protrusions that represent sites of cellular growth. mAbp1 appears at the actin-rich leading edge of migrating cells. Growth factors cause mAbp1 to rapidly accumulate in lamellipodia. This response can be mimicked by expression of dominant-positive Rac1. mAbp1 recruitment appears to be dependent on de novo actin polymerization and occurs specifically at sites enriched for the Arp2/3 complex. mAbp1 is a newly identified cytoskeletal protein in mice and may serve as a signal-responsive link between the dynamic cortical actin cytoskeleton and regions of membrane dynamics.[1]

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