The influence of Ca2+ ions on the difference absorption spectra of phosphorylase kinase.
A low iodide concentration causes a positive difference band in the 250-260 mm UV range. The effect of Ca2+ changes the direction of difference spectra. The concentration dependence is explained by multistage interaction. The addition of EDTA the solution restores the positive band.
D002118:Calcium; D010764:Phosphorylase Kinase; D013056:Spectrophotometry, Ultraviolet
D010764:Phosphorylase Kinase; D002118:Calcium