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Deprecated: Implicit conversion from float 269.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Proc+Natl+Acad+Sci+U+S+A 2016 ; 113 (47): E7464-73 Nephropedia Template TP
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A Diaphanous-related formin links Ras signaling directly to actin assembly in macropinocytosis and phagocytosis #MMPMID27821733
Junemann A; Fili? V; Winterhoff M; Nordholz B; Litschko C; Schwellenbach H; Stephan T; Weber I; Faix J
Proc Natl Acad Sci U S A 2016[Nov]; 113 (47): E7464-73 PMID27821733show ga
Macropinocytosis and phagocytosis are two Ras-regulated, highly related processes of great physiological relevance collectively termed large-scale endocytosis. Both are actin-driven and entail engulfment of extracellular material by crown-like protrusions. Aside from the Arp2/3 complex, which serves as the main nucleator of branched actin filaments at the cup rim, the underlying mechanisms of actin assembly still remain elusive. Here, we analyzed the role of Diaphanous-related formin G (ForG) from Dictyostelium by biochemical, genetic, and imaging techniques. Our data demonstrate that this formin exhibits a rather weak nucleation activity and imply that ForG-mediated filament elongation synergizes with the Arp2/3 complex in actin assembly. Finally, we identify ForG as a Ras-regulated formin and show its significance for actin assembly in endocytic structures.