Guanylate cyclase involved in the production of the second messenger cGMP (By similarity). Regulates thermotaxis responses in AFD sensory neurons. May regulate AFD neuronal activity such as calcium responses to temperature gradients (PubMed:16415369). GTP = 3',5'-cyclic GMP + diphosphate Localizes exclusively to the sensory ending, known as cilium, in AFD neurons. Expressed specifically in AFD sensory neurons. The protein kinase domain is predicted to be catalytically inactive. Belongs to the adenylyl cyclase class-4/guanylyl cyclase family.