Izmenenie strukturnogo sostoianiia miozinovykh niteǐ v glitserinizirovannykh voloknakh skeletnykh myshts krolika, indutsiruemye fosforilirovaniem legkikh tsepeǐ miozina.

Using the polarization microfluorimetry method, it was demonstrated that the increase in the degree of phosphorylation of myosin light chains (LC2) in extended single glycerinated fibers from rabbit psoas muscle changes the anisotropy of polarized fluorescence both tryptophan residue in the rod parts of the myosin molecule and the fluorescent label-N (iodoacetyl-aminoethyl)-5-naphthylamine-1-sulfonate (1,5-IAEDANS) bound to the SH1-group in myosin molecule heads. The changes in fluorescence anisotropy during LC2 phosphorylation were observed, when the measurements were performed only in the presence of 5 mM MgCl2. It was suggested that in the presence of MgCl2 the phosphorylation of LC2 associated with myosin heads changes their orientation and causes conformational shifts in the myosin filament core.