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Role of Formins in Actin Assembly: Nucleation and Barbed-End Association
David Pruyne,1*Marie Evangelista,2*Changsong Yang,3Erfei Bi,4Sally Zigmond,3Anthony Bretscher,1Charles Boone25
Nucleation of branched actin filaments by the Arp2/3 complex is a
conserved process in eukaryotic cells, yet the source ofunbranched
actin filaments has remained obscure. In yeast, forminsstimulate
assembly of actin cables independently of Arp2/3. Here,the conserved
core of formin homology domains 1 and 2 of Bni1p(Bni1pFH1FH2) was
found to nucleate unbranched actin filamentsin vitro.
Bni1pFH2 provided the minimal region sufficient fornucleation. Unique
among actin nucleators, Bni1pFH1FH2 remainedassociated with the
growing barbed ends of filaments. This combinationof properties
suggests a direct role for formins in regulatingnucleation and
polarization of unbranched filamentous actin structures.
1 Department of Molecular Biology and Genetics,
Cornell University, Ithaca, NY 14853, USA.
2 Department of Biology, Queen's University,
Kingston, Ontario, K7L 3N6 Canada.
3 Biology
Department, University of Pennsylvania, Philadelphia, PA 19104-6018,
USA.
4 Department of Cell and Developmental Biology,
University of Pennsylvania, Philadelphia, PA 19104, USA.
5 Banting and Best Department of Medical Research
and Department of Molecular and Medical Genetics, University of
Toronto, Toronto, Ontario, M5G 1L6 Canada.
*
These authors contributed equally to this work.
To whom correspondence should be addressed.
E-mail: apb5{at}cornell.edu (A.B.), charlie.boone{at}utoronto.ca
(C.B.)
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