The GAF domain is a type of protein domain that is found in a wide range of proteins from all species. The GAF domain is named after some of the proteins it is found in: cGMP-specific phosphodiesterases, adenylyl cyclases and FhlA. The first structure of a GAF domain solved by Ho and colleagues showed that this domain shared a similar fold with the PAS domain. In mammals, GAF domains are found in five members of the cyclic nucleotide phosphodiesterase superfamily: PDE2, PDE5, and PDE6 which bind cGMP to the GAF domain, PDE10 which binds cAMP, and PDE11 which binds both cGMP and cAMP.
↑Aravind L, Ponting CP (December 1997). "The GAF domain: an evolutionary link between diverse phototransducing proteins". Trends in Biochemical Sciences. 22 (12): 458–9. doi:10.1016/S0968-0004(97)01148-1. PMID9433123.
↑Schultz JE (2009). "Structural and biochemical aspects of tandem GAF domains". CGMP: Generators, Effectors and Therapeutic Implications. Handbook of Experimental Pharmacology. Vol.191. pp.93–109. doi:10.1007/978-3-540-68964-5_6. ISBN978-3-540-68960-7. PMID19089327.