ArticleBiophysical journal2000
Structural implications of the chemical modification of Cys(10) on actin.
Article in Biophysical journal, 2000. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Who cites it
1 citing paper in PubMed, 1 citations in OpenAlex.
- Myopathy-Sensitive G-Actin Segment 227-235 Is Involved in Salt-Induced Stabilization of Contacts within the Actin Filament.International journal of molecular sciences · 2021Article
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3 authors at 2 institutions in 2 countries.
Funding
Abstract
Cys(10) is located in subdomain 1 of actin, which has an important role in the interaction of actin with myosin- and actin-binding proteins. Cys(10) was modified with fluorescence probes N-(iodoacetyl)N'-(5-sulfo-1-naphthyl)ethylene diamine (IAEDANS), 7-diethylamino-3-(4'-maleimidylphenyl)-4-methylcoumarin (CPM), or monobromo bimane (MBB) by the method of, J. Biol. Chem. 266:5508-5513). The specificity of Cys(10) modification was verified by showing that the 33-kDa subtilisin fragment of actin (residues 48-375), which contains all of the actin thiols but Cys(10), is not fluorescent. Cys(10) modification exposed a new site on actin to subtilisin cleavage. Edman degradation revealed this site to be between Ala(19) and Gly(20). The modification slightly increased the rate of epsilonATP-ATP exchange and decreased the rates of G-actin ATPase and polymerization. The activation of S1 ATPase by Cys(10)-modified F-actin showed small probe-dependent changes in the values of V(max) and K(M). The sliding speed of actin filaments in the in vitro motility assay remained unchanged upon modification of Cys(10). These results indicate that although the labeling of Cys(10) perturbs the structure of subdomain 1, the modified actin remains fully functional. The binding of S1 to actin filaments decreases the accessibility of Cys(10) probes to acrylamide and nitromethane quenchers. Because Cys(10) does not participate directly in either actin polymerization or S1 binding, our results indicate that actin-actin and actin-myosin interactions induce dynamic, allosteric changes in actin structure.
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