NDLI: Conformational change and cooperativity in actin filaments free of tropomyosin.

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Conformational change and cooperativity in actin filaments free of tropomyosin.

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Conformational change and cooperativity in actin filaments free of tropomyosin.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Loscalzo, J. Weber, A. Reed, G. H.
Abstract	The decrease in amplitude of the electron spin resonance spectrum of the cysteine-bound spin-label, 3-(maleimidomethyl)-2,2,5,5-tetramethyl-1-pyrrolidinoxyl, brought about by the magnetic interaction with tightly bound manganous ion, was used as a probe of conformational change in actin on binding myosin. The magnitude of this 'spin--spin' interaction first decreased then increased on increasing saturation of the actin filament with heavy meromyosin subfragment-1. That the 'spin--spin' interaction occurred between spins of adjacent monomers was demonstrated by the observation that the change in magnitude of the 'spin--spin' interaction was maintained on binding of heavy meromyosin subfragment-1 to copolymers in which actin monomers containing both manganous ion and spin label were diluted 7-fold with native actin monomers. These data provide evidence for a conformational change in actin on interacting with heavy meromyosin subfragment-1. Further, the fact that not only the magnitude but also the sense of the change in the 'spin--spin' interaction is a function of increasing saturation with heavy meromyosin subfragment-1 indicates that the monomers of the actin filament are capable of cooperative interaction in the absence of tropomyosin.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	9
Volume Number	72
Language	English
Publisher	National Academy of Sciences
Publisher Date	1975-01-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Actins Metabolism Binding Sites Myosin Subfragments Phosphates Protein Conformation Viscosity Research Support, U.S. Gov't, P.H.S. Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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