Formins include several families of proteins that regulate actin cytoskeletal dynamics via two conserved formin homology domains, FH1 and FH2. Through cooperation of FH1 and FH2, formins construct actin-based structures comprising linear, unbranched filaments that are used in stress fibers, actin cables, microspikes, and contractile rings. A subgroup of the formins is the diaphanous (Dia) family, which includes mDia1 (Diap1), mDia2 (Diap3), and mDia3 (Diap2). The mDia1 protein is activated by Rho and leads to ROCK-dependent stress fiber formation. Rho-activated mDia1 regulates serum response factor-dependent transcription. In cancers, mDia1 has been implicated in ras-mediated transformation, metastasis, and invasion. Thus, mDia1 is a Rho-activated formin with both cytoskeletal- and transcription-reguatling activities.
Ishizaki, T. et al. (2001) Nat Cell Biol. 3:8-14.
Watanabe, N. et al. (1999) Nat Cell Biol. 1:136-143.
*For more information, see UniProt Accession O60610
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*All molecular weights (MW) are confirmed by comparison to Bio-Rad Rainbow Markers and to western blot mobilities of known proteins with similar MW.
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