Guanine nucleotide-binding proteins (G proteins) are involved as modulators or transducers in various transmembrane signaling systems. May play a role in resistance to fungal infection in the epidermis by regulating the up-regulation of several antimicrobial peptides of the NLP and CNC families. Upstream of plc-3, egl-8, tpa-1 and the p38-like pathway, required for the expression of antimicrobial peptide nlp-29 in the epidermis in response to fungal infection or physical injury. 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.