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The influence of caldesmon on strong binding of myosin with actin in denervated rat skeletal muscles

Kirillina, V.P.; Jakubiec-Puka, A.; Borovikov, I.S.

Tsitologiia 48(7): 554-559

2006

ISSN/ISBN: 0041-3771
PMID: 17087146
Document Number: 598010
The effect of caldesmon (CaD) on conformational changes in F-actin modified by fluorescent probe TRITC-phalloidin was investigated by polarized fluorimetry. Changes were induced by a subfragment-1 (S-1) of myosin in the absence or presence of CaD in ghost muscle fibers obtained from intact and denervated slow (SOL) and fast (EDL) skeletal muscles of rats. S-1 binding to actin of both SOL and EDL muscles was shown to cause changes in polarized parameters of TRITC-phalloidin typical for a strong actin-myosin binding as well as of transition ofactin subunits from "off" to "on" state. CaD inhibits this significantly. Denervation atrophy inhibits the effect of S-1 as well but does not affect the capability of CaD decreasing the formation of strong binding in actomyosin complex. It is supposed that CaD "freezes" F-actin structure in "off" state. The denervation atrophy has no effect on CaD responsibility to bind thin filaments and to switch "off" actin monomers.

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