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Question

Phosphodiesterase terminates signaling by

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Explanation

Cyclic-nucleotide phosphodiesterases hydrolyze cAMP or cGMP to the corresponding inactive 5'-monophosphates, thereby terminating the second-messenger signal. Regulation of phosphodiesterase activity provides an important mechanism for controlling the duration and amplitude of cyclic-nucleotide signaling in cells. These enzymes are important pharmacological targets for modulating cyclic nucleotide levels. Careful