Cyclic Nucleotide-Regulated Protein KinasesA group of enzymes that catalyzes the phosphorylation of serine or threonine residues of proteins and is dependent on cyclic nucleotides.
EnzymesBiological molecules that possess catalytic activity. They may occur naturally or be synthetically created. Enzymes are usually proteins, however catalytic RNA (RNA, CATALYTIC) and catalytic DNA (DNA, CATALYTIC) molecules have also been identified.
PhosphorylationThe introduction of a phosphoryl group into a compound through the formation of an ester bond between the compound and a phosphorus moiety.
SerineA non-essential amino acid occurring in natural form as the L-isomer. It is synthesized from GLYCINE or THREONINE. It is involved in the biosynthesis of PURINES, PYRIMIDINES, and other amino acids.
ThreonineAn essential amino acid occurring naturally in the L-form, which is the active form. It is found in eggs, milk, gelatin, and other proteins.
ProteinsLinear POLYPEPTIDES that are synthesized on RIBOSOMES and may be further modified, crosslinked, cleaved, or assembled into complex proteins with several subunits. The specific sequence of AMINO ACIDS determines the shape the polypeptide will take, during PROTEIN FOLDING, and the function of the protein.
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