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PMID: 11285275 Published · ppublish English Journal Article Research Support, U.S. Gov't, P.H.S.

Actin depolymerizing factor stabilizes an existing state of F-actin and can change the tilt of F-actin subunits.

The Journal of cell biology ·Vol. 153 ·No. 1 ·2001-04-02 ·Pages 75-86

Galkin VE, Orlova A, Lukoyanova N, Wriggers W, Egelman EH

Abstract

Proteins in the actin depolymerizing factor (ADF)/cofilin family are essential for rapid F-actin turnover, and most depolymerize actin in a pH-dependent manner. Complexes of human and plant ADF with F-actin at different pH were examined using electron microscopy and a novel method of image analysis for helical filaments. Although ADF changes the mean twist of actin, we show that it does this by stabilizing a preexisting F-actin angular conformation. In addition, ADF induces a large ( approximately 12 degrees ) tilt of actin subunits at high pH where filaments are readily disrupted. A second ADF molecule binds to a site on the opposite side of F-actin from that of the previously described ADF binding site, and this second site is only largely occupied at high pH. All of these states display a high degree of cooperativity that appears to be an integral part of F-actin.

MeSH Terms
Actin Depolymerizing Factors Actins/chemistry,metabolism Animals Destrin Humans Microfilament Proteins/chemistry,metabolism Models, Molecular Rabbits
Chemicals
Actin Depolymerizing Factors Actins DSTN protein, human Destrin Microfilament Proteins
Authors & Affiliations
5 authors, click to expand affiliations / ORCID
Galkin V E
Department of Biochemistry and Molecular Genetics, University of Virginia Health Sciences Center, Charlottesville, Virginia 22908, USA.
Orlova A
Lukoyanova N
Wriggers W
Egelman E H
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Article Info
Journal
The Journal of cell biology
Abbr.
J Cell Biol
ISSN
0021-9525
Published
2001-04-02
Pages
75-86
Language
English
Region
United States
NLM ID
0375356
PMCID
PMC2185532
Subset
IM
Grants
NCRR NIH HHS · P41-RR12255 · United States
NIAMS NIH HHS · R01-AR42023 · United States
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