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There are two distinct cyclic AMP phosphodiesterases associated with the liver mitochondrion: one with the outer membrane and one with the inner membrane. No activity is associated with the lysosomal fraction. Both of the enzymes are peripheral proteins and can be released from the membranes by high-ionic-strength treatment. Treatment of intact mitochondria with trypsin and insoluble trypsin localizes these enzymes to the cytosol-facing surface of their respective membranes. The enzymes differ in regard to sedimentation coefficient, thermostability and susceptibility to inactivation by trypsin. Both enzymes degrade cyclic AMP and cyclic GMP. Whereas the outer-membrane enzyme displays Michaelis kinetics and appears to be a low-affinity enzyme, the inner-membrane enzyme displays kinetics indicative of apparent negative co-operativity.

Submitochondrial localization and asymmetric disposition of two peripheral cyclic nucleotide phosphodiesterases