Guanine nucleotide-binding proteins (G proteins) are involved as modulators or transducers in various transmembrane signaling systems. Promotes transcription of 3',5'-cyclic phosphodiesterases pde-1 and pde-5, leading to reduced cGMP levels in sensory neurons. This causes suppression of insulin production and signaling which leads to increased daf-16 activity and contributes to increased adult lifespan and resistance to oxidative stress. In addition, by reducing cGMP levels, inhibits TGF-beta signaling pathways. Involved in behavioral response to P.aeruginosa by controlling the expression of daf-7, a member of the TGF-beta family, in ASJ sensory neurons. G proteins are composed of 3 units; alpha, beta and gamma. The alpha chain contains the guanine nucleotide binding site. Belongs to the G-alpha family. G(q) subfamily.