title: Opening of tandem calponin homology domains regulates their affinity for F-actin.
abstract: Many actin-binding proteins contain calponin homology (CH) domains, but the manner in which these domains interact with F-actin has been controversial. Crystal structures have shown the tandem CH domains of alpha-actinin to be in a compact, closed conformation, but the interpretations of complexes of such tandem CH domains with F-actin have been ambiguous. We show that the tandem CH domains of alpha-actinin bind F-actin in an open conformation, explaining mutations that cause human diseases and suggesting that the opening of these domains may be one of the main regulatory mechanisms for proteins with tandem CH domains.
authors.affiliation: Department of Biochemistry and Molecular Genetics, University of Virginia Medical Center, Charlottesville, Virginia, USA.
authors.forename: Vitold E
authors.initials: VE
authors.lastname: Galkin
authors.forename: Albina
authors.initials: A
authors.lastname: Orlova
authors.forename: Anita
authors.initials: A
authors.lastname: Salmazo
authors.forename: Kristina
authors.initials: K
authors.lastname: Djinovic-Carugo
authors.forename: Edward H
authors.initials: EH
authors.lastname: Egelman
mesh_terms: D000185:Actinin / Q000737:chemistry* / Q000378:metabolism*; D000199:Actins / Q000737:chemistry* / Q000378:metabolism*; D002135:Calcium-Binding Proteins / Q000737:chemistry*; D018360:Crystallography, X-Ray; D006801:Humans; D008840:Microfilament Proteins / Q000737:chemistry* / Q000378:metabolism; D008958:Models, Molecular; D011485:Protein Binding; D011487:Protein Conformation; D017434:Protein Structure, Tertiary; D000096985:Calponins
chemical_list: D000185:Actinin; D000199:Actins; D002135:Calcium-Binding Proteins; D008840:Microfilament Proteins; D000096985:Calponins
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