Phosphodiesterase specific for cGMP, which is activated by cGMP but not by cAMP (PubMed:12429832, PubMed:12429831) (Probable). Involved in the degradation of intracellular cGMP, contributes to the control of cGMP signals (PubMed:12198158, PubMed:12429832). 3',5'-cyclic GMP + H2O = GMP + H(+) Divalent metal cation. Can use Mn(2+) or, to a lower extent, Mg(2+) or Zn(2+). Half-maximal activation occurs between 10 and 100 uM of Mn(2+) whereas maximal activation occurs with 10 mM of Zn(2+) or Mg(2+). cAMP/cGMP selectivity of 0.003. Optimum pH is 7.0. Expressed during growth and development, with the highest level of expression during aggregation. The beta lactamase-like domain catalyzes the hydrolysis of cGMP. Belongs to the metallo-beta-lactamase superfamily. cNMP phosphodiesterase family.