mutation of a channel regulatory protein is proposed to involve either : ( a ) change of phosphorylated serine residue to an unreactive residue , ( b ) change in a nearby residue that does not affect phosphorylation by camp-dependent kinase , but results in dephosphorylation by a different phosphatase , or ( c ) change in a nearby residue that produces a structure unreactive with camp-dependent protein kinase .
C0031715
phosphorylation
C0031727
kinase