Guanylate cyclase involved in the production of the second messenger cGMP (By similarity). GTP = 3',5'-cyclic GMP + diphosphate Expressed asymmetrically in ASE left (ASEL) sensory neuron. Expressed in excretory gland and canal cell. The protein kinase domain is predicted to be catalytically inactive. Belongs to the adenylyl cyclase class-4/guanylyl cyclase family.