期刊
PROTEINS-STRUCTURE FUNCTION AND BIOINFORMATICS
卷 73, 期 4, 页码 902-917出版社
WILEY
DOI: 10.1002/prot.22116
关键词
tropomyosin; coiled-coil; double-mutant thermodynamic cycles; muscle; protein-protein docking
资金
- Netherlands Organization for Scientific Research (NOW)
- Fundacao de Amparo Pesquisa do Estado de Sao Paulo (FAPESP)
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)
Skeletal alpha-tropomyosin (Tm) is a dimeric coiled-coil protein that forms linear assemblies under low ionic strength conditions in vitro through head-to-tail interactions. A previously published NMR structure of the Tin head-to-tail complex revealed that it is formed by the insertion of the N-terminal coiled-coil of one molecule into a cleft formed by the separation of the helices at the C-terminus of a second molecule. To evaluate the contribution of charged residues to complex stability, we employed single and double-mutant Tm fragments in which specific charged residues were changed to alanine in head-to-tail binding assays, and the effects of the mutations were analyzed by thermodynamic double-mutant cycles and protein-protein docking. The results show that residues K5, K7, and D280 are essential to the stability of the complex. Though D2, K6, D275, and H276 are exposed to the solvent and do not participate in intermolecular contacts in the NMR structure, they may contribute to head-to-tail complex stability by modulating the stability of the helices at the Tm termini.
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