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[Phosphorylation of endogenous proteins of bovine retina rod outer segments].

The components of bovine rod outer segments (ROS) and water-soluble extracts of ROS were separated by SDS-electrophoresis after incubation with [gamma-32P]ATP or [gamma-32P]GTP at different experimental conditions. After that gels were autoradiographed to reveal the phosphorylated intermediates. Our results suggest, that ROS contains the following protein kinase systems: 1) water-soluble cAMP-dependent protein kinases, that uses ATP, but not GTP, and phosphorylates the water-soluble 30 000 molecular weight protein; 2) protein kinase that uses GTP (probably, ATP also) and phosphorylates the 20 000 molecular weight protein in light-adapted ROS; 3) water-soluble cyclic nucleotide- and Ca2+-independent protein kinase that uses ATP rather than GTP and phosphorylates the water-soluble 70 000 molecular weight protein. The concentrations of phosphorylated intermediates in bovine ROS are estimated.