The Gab operon is responsible for the conversion of γ-aminobutyrate to succinate, what is the  is the chief inhibitory neurotransmitter in the mammalian central nervous system, called?
Gab operon The "gab" operon is responsible for the conversion of γ-aminobutyrate (GABA) to succinate. The "gab" operon comprises three structural genes – "gabD", "gabT" and "gabP" – that encode for a succinate semialdehyde dehydrogenase, GABA transaminase and a GABA permease respectively. There is a regulatory gene "csiR", downstream of the operon, that codes for a putative transcriptional repressor and is activated when nitrogen is limiting.
Anandamide Anandamide, also known as "N"-arachidonoylethanolamine or AEA, is a fatty acid neurotransmitter derived from the non-oxidative metabolism of eicosatetraenoic acid (arachidonic acid) an essential ω-6 polyunsaturated fatty acid. The name is taken from the Sanskrit & Pāli word "ananda", which means "joy, bliss, delight", and amide. It is synthesized from "N"-arachidonoyl phosphatidylethanolamine by multiple pathways. It is degraded primarily by the fatty acid amide hydrolase (FAAH) enzyme, which converts anandamide into ethanolamine and arachidonic acid. As such, inhibitors of FAAH lead to elevated anandamide levels and are being pursued for therapeutic use.