This family of proteins is found in bacteria and plants. It includes abscisic acid (ABA)-deficient 4 protein (ABA4) from Arabidopsis thaliana, which has a role in neoxanthin synthesis [1] and may be important for the de novo ABA synthesis specifically during dehydration [1].

1: The Arabidopsis ABA-deficient mutant aba4 demonstrates that the major route for stress-induced ABA accumulation is via neoxanthin isomers. North HM, De Almeida A, Boutin JP, Frey A, To A, Botran L, Sotta B, Marion-Poll A; Plant J. 2007;50:810-824. PMID:17470058