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Ferjani I, Fattoum A, Manai M, Benyamin Y, Roustan C, Maciver SK. Two distinct regions of calponin share common binding sites on actin resulting in different modes of calponin-actin interaction. BIOCHIMICA ET BIOPHYSICA ACTA 2010; 1804:1760-7. [PMID: 20595006 DOI: 10.1016/j.bbapap.2010.05.012] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2009] [Revised: 05/05/2010] [Accepted: 05/25/2010] [Indexed: 10/19/2022]
Abstract
Calponins are a small family of proteins that alter the interaction between actin and myosin II and mediate signal transduction. These proteins bind F-actin in a complex manner that depends on a variety of parameters such as stoichiometry and ionic strength. Calponin binds G-actin and F-actin, bundling the latter primarily through two distinct and adjacent binding sites (ABS1 and ABS2). Calponin binds other proteins that bind F-actin and considerable disagreements exist as to how calponin is located on the filament, especially in the presence of other proteins. A study (Galkin, V.E., Orlova, A., Fattoum, A., Walsh, M.P. and Egelman, E.H. (2006) J. Mol. Biol. 359, 478-485.), using EM single-particle reconstruction has shown that there may be four modes of interaction, but how these occur is not yet known. We report that two distinct regions of calponin are capable of binding some of the same sites on actin (such as 18-28 and 360-372 in subdomain 1). This accounts for the finding that calponin binds the filament with different apparent geometries. We suggest that the four modes of filament binding account for differences in stoichiometry and that these, in turn, arise from differential binding of the two calponin regions to actin. It is likely that the modes of binding are reciprocally influenced by other actin-binding proteins since members of the alpha-actinin group also adopt different actin-binding positions and bind actin principally through a domain that is similar to calponin's ABS1.
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Affiliation(s)
- Imen Ferjani
- UMR 5539 (CNRS) Laboratoire de motilité cellulaire (Ecole Pratique des Hautes Etudes) Université de Montpellier 2, Place E. Bataillon, CC107, 34095 Montpellier Cedex 5, France
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Ferjani I, Fattoum A, Bettache N, Seantier B, Milhiet PE, Manai M, Benyamin Y, Roustan C, Maciver SK. The gelsolin:calponin complex nucleates actin filaments with distinct morphologies. Biochem Biophys Res Commun 2010; 392:118-23. [PMID: 20035726 DOI: 10.1016/j.bbrc.2009.12.103] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2009] [Accepted: 12/17/2009] [Indexed: 11/20/2022]
Abstract
Gelsolin and calponin are cytoskeletal and signalling proteins that form a tight 1:1 complex (GCC). We show that calponin within the GCC inhibits the rate of gelsolin mediated nucleation of actin polymerization. The actin-binding function of calponin is ablated within the GCC as the actin-binding site overlaps with one of the gelsolin binding sites. The structure of filaments that result from nucleation by GCC are different to those nucleated by gelsolin alone in that they are longer, loosely bundled and stain heterogeneously with phalloidin. GCC nucleated filaments appear contorted and wrap around each to form the loose bundles.
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Affiliation(s)
- Imen Ferjani
- DIMNP, University of Montpellier 2 and 1, CNRS Montpellier, Place E. Bataillon CC107, 34095 Montpellier Cedex 5, France
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Parker KC, Walsh RJ, Salajegheh M, Amato AA, Krastins B, Sarracino DA, Greenberg SA. Characterization of Human Skeletal Muscle Biopsy Samples Using Shotgun Proteomics. J Proteome Res 2009; 8:3265-77. [DOI: 10.1021/pr800873q] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kenneth C. Parker
- Harvard Partners Center for Genetics and Genomics, Cambridge, MA, Department of Neurology, Brigham and Women’s Hospital, Harvard Medical School, and Informatics Program, Children’s Hospital Boston, Harvard Medical School, Boston, MA
| | - Ronan J. Walsh
- Harvard Partners Center for Genetics and Genomics, Cambridge, MA, Department of Neurology, Brigham and Women’s Hospital, Harvard Medical School, and Informatics Program, Children’s Hospital Boston, Harvard Medical School, Boston, MA
| | - Mohammad Salajegheh
- Harvard Partners Center for Genetics and Genomics, Cambridge, MA, Department of Neurology, Brigham and Women’s Hospital, Harvard Medical School, and Informatics Program, Children’s Hospital Boston, Harvard Medical School, Boston, MA
| | - Anthony A. Amato
- Harvard Partners Center for Genetics and Genomics, Cambridge, MA, Department of Neurology, Brigham and Women’s Hospital, Harvard Medical School, and Informatics Program, Children’s Hospital Boston, Harvard Medical School, Boston, MA
| | - Bryan Krastins
- Harvard Partners Center for Genetics and Genomics, Cambridge, MA, Department of Neurology, Brigham and Women’s Hospital, Harvard Medical School, and Informatics Program, Children’s Hospital Boston, Harvard Medical School, Boston, MA
| | - David A. Sarracino
- Harvard Partners Center for Genetics and Genomics, Cambridge, MA, Department of Neurology, Brigham and Women’s Hospital, Harvard Medical School, and Informatics Program, Children’s Hospital Boston, Harvard Medical School, Boston, MA
| | - Steven A. Greenberg
- Harvard Partners Center for Genetics and Genomics, Cambridge, MA, Department of Neurology, Brigham and Women’s Hospital, Harvard Medical School, and Informatics Program, Children’s Hospital Boston, Harvard Medical School, Boston, MA
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