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Study of tropo myosin labeled with a fluorescent probe by pulse fluorometry in polarized light interaction of that protein with troponin and actin


, : Study of tropo myosin labeled with a fluorescent probe by pulse fluorometry in polarized light interaction of that protein with troponin and actin. European Journal of Biochemistry 88(2): 421-424

Tropomyosin from rabbit skeletal muscle was labeled with a fluorescent probe, N-iodoacetyl-N'-(5-sulfo-1-naphthyl)-ethylenediamine, which is presumed to bind preferentially to the unique reactive cysteine residue of the .alpha. chain. Anisotropy decay measurements show that tropomyosin monomer and polymer are flexible molecules. This flexibility decreases when troponin interacts with tropomyosin, and is partially restored by a micromolar concentration of Ca2+.

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PMID: 689027


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