Abstract
Recoverin, a new calcium binding protein from bovine rod photoreceptor cells, activates guanylyl cyclase below a free calcium concentration of 200 nM. We show here that recoverin is phosphorylated by an endogeneous kinase and Mg-ATP at the same decreased calcium concentration. The calcium-dependent activation of guanylyl cyclase is enhanced in the presence of ATP. We suggest that phosphorylation of recoverin reinforces the stimulation of guanylyl cyclase at decreased calcium concentrations.
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