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Science 3 December 1999:
Vol. 286. no. 5446, pp. 1939 - 1942
DOI: 10.1126/science.286.5446.1939
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Reports

Domain Movement in Gelsolin: A Calcium-Activated Switch

Robert C. Robinson, 1 Marisan Mejillano, 2 Vincent P. Le, 1 Leslie D. Burtnick, 3 Helen L. Yin, 2 Senyon Choe 1*

The actin-binding protein gelsolin is involved in remodeling the actin cytoskeleton during growth-factor signaling, apoptosis, cytokinesis, and cell movement. Calcium-activated gelsolin severs and caps actin filaments. The 3.4 angstrom x-ray structure of the carboxyl-terminal half of gelsolin (G4-G6) in complex with actin reveals the basis for gelsolin activation. Calcium binding induces a conformational rearrangement in which domain G6 is flipped over and translated by about 40 angstroms relative to G4 and G5. The structural reorganization tears apart the continuous beta  sheet core of G4 and G6. This exposes the actin-binding site on G4, enabling severing and capping of actin filaments to proceed.

1 Structural Biology Laboratory, Salk Institute for Biological Studies, Post Office Box 85800, San Diego, CA 92186-5800, USA.
2 Department of Physiology, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX 75235, USA.
3 Department of Chemistry, University of British Columbia Vancouver, BC, Canada V6T 1Z1.
*   To whom correspondence should be addressed. E-mail: choe{at}sbl.salk.edu

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