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mDia1, a Rho effector, belongs to the Formin family of proteins,which shares the conserved tandem FH1-FH2 unit structure. Forminsincluding mDia1 accelerate actin nucleation while interactingwith actin filament fast-growing ends. Here our single-moleculeimaging revealed fast directional movement of mDia1 FH1-FH2for tens of microns in living cells. The movement of mDia1 FH1-FH2was blocked by actin-perturbing drugs, and the speed of mDia1FH1-FH2 movement appeared to correlate with actin elongationrates. In vitro, mDia1 FH1-FH2 associated persistently withthe growing actin barbed end. mDia1 probably moves processivelyalong the growing end of actin filaments in cells, and Forminsmay be a molecular motility machinery that is independent frommotor proteins.
1 Department of Pharmacology, Kyoto University Faculty of Medicine, Yoshida Konoe-cho, Sakyo-ku, Kyoto, Japan. 2 PRESTO, Japan Science and Technology Agency, 4-1-8 Honcho Kawaguchi, Saitama, Japan.
* To whom correspondence should be addressed. E-mail: naoki-w{at}mfour.med.kyoto-u.ac.jp
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