The N-terminal tropomyosin- and actin-binding sites are important for leiomodin 2's function.
Author
Ly, ThuMoroz, Natalia
Pappas, Christopher T
Novak, Stefanie M
Tolkatchev, Dmitri
Wooldridge, Dayton
Mayfield, Rachel M
Helms, Gregory
Gregorio, Carol C
Kostyukova, Alla S
Affiliation
Univ Arizona, Sarver Mol Cardiovasc Res Program, Dept Cellular & Mol MedIssue Date
2016-08-15
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AMER SOC CELL BIOLOGYCitation
The N-terminal tropomyosin- and actin-binding sites are important for leiomodin 2's function. 2016, 27 (16):2565-75 Mol. Biol. CellJournal
Molecular biology of the cellRights
© 2016 Ly, Moroz, et al. This article is distributed by The American Society for Cell Biology under license from the author(s). Two months after publication it is available to the public under an Attribution–Noncommercial–Share Alike 3.0 Unported Creative Commons License (http://creativecommons.org/licenses/by-nc-sa/3.0).Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
Leiomodin is a potent actin nucleator related to tropomodulin, a capping protein localized at the pointed end of the thin filaments. Mutations in leiomodin-3 are associated with lethal nemaline myopathy in humans, and leiomodin-2-knockout mice present with dilated cardiomyopathy. The arrangement of the N-terminal actin- and tropomyosin-binding sites in leiomodin is contradictory and functionally not well understood. Using one-dimensional nuclear magnetic resonance and the pointed-end actin polymerization assay, we find that leiomodin-2, a major cardiac isoform, has an N-terminal actin-binding site located within residues 43-90. Moreover, for the first time, we obtain evidence that there are additional interactions with actin within residues 124-201. Here we establish that leiomodin interacts with only one tropomyosin molecule, and this is the only site of interaction between leiomodin and tropomyosin. Introduction of mutations in both actin- and tropomyosin-binding sites of leiomodin affected its localization at the pointed ends of the thin filaments in cardiomyocytes. On the basis of our new findings, we propose a model in which leiomodin regulates actin poly-merization dynamics in myocytes by acting as a leaky cap at thin filament pointed ends.ISSN
1939-4586PubMed ID
27307584Version
Final published versionSponsors
National Institutes of Health [RO1GM081688, R01HL108625, R01HL123078, 1F31HL117520]Additional Links
http://www.molbiolcell.org/content/early/2016/06/13/mbc.E16-03-0200ae974a485f413a2113503eed53cd6c53
10.1091/mbc.E16-03-0200
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Except where otherwise noted, this item's license is described as © 2016 Ly, Moroz, et al. This article is distributed by The American Society for Cell Biology under license from the author(s). Two months after publication it is available to the public under an Attribution–Noncommercial–Share Alike 3.0 Unported Creative Commons License (http://creativecommons.org/licenses/by-nc-sa/3.0).
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