[Circular dichroism spectra of myocardial actin in respiratory hypoxia].

Straub actin secondary structure of canine myocardium with respiratory hypoxia is shown not to differ significantly from the normal one. However, circular dichroism spectra in 250-300 nm region deviate significantly. Fractional composition of pathological actin proved to be practically identical to the normal one. This fact suggests that circular dichroism spectra alteration is presumably due to the conformation change of environments of aromatic acids which are included in actin active sites, responsible for polymerization.