Published online March 3, 2008
doi:10.1083/jcb.200802062
The Journal of Cell Biology, Vol. 180, No. 5, 853-855
The Rockefeller University Press, 0021-9525 $30.00
© 2008 Cai et al.
Peering deeply inside the branch
Liang Cai1,2 and
James E. Bear1,2
1 Lineberger Comprehensive Cancer Center and 2 Department of Cell and Developmental Biology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599
Correspondence to James E. Bear: jbear{at}email.unc.edu
The actin-related protein 2/3 (Arp2/3) story has captivated the cytoskeleton community for over a decade. Not only does this complex nucleate new actin filaments, but it also anchors them into a dendritic meshwork that is used in many cellular contexts such as lamellipodial protrusion, endosome rocketing, and the movement of pathogens. One key piece of this puzzle that has been missing is a detailed structure of the Arp2/3-actin branch. Using electron tomography and computational docking, Rouiller et al. (Rouiller, I., X.-P. Xu, K.J. Amann, C. Egile, S. Nickell, D. Nicastro, R. Li, T.D. Pollard, N. Volkmann, and D. Hanein. 2008. J. Cell Biol. 180:887–895) present an elegant and intriguing structure of the Arp2/3 complex–mediated actin branch.

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