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Mobility of the N-terminal segment of rabbit skeletal muscle F-actin detected by ¹H and ¹⁹F nuclear magnetic resonance spectroscopy

Heintz, D. ; Kany, H. ; Kalbitzer, Hans Robert


After polymerization filamentous actin (F-actin) still shows a number of rather narrow 1H NMR signals in its Mg2+ form which are quenched when Mg2+ is replaced by Ca2+. These resonances originate from mobile residues in F-actin. For assignment of these resonances three different strategies were used, the fluorine labeling of Cys-374 by 4-(perfluoro-tert-butyl)phenyliodoacetamide, binding studies ...


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