This model represents an uncharacterized plant-specific family of FAD-dependent oxidoreductases. At least seven distinct members are found in Arabidopsis thaliana. The family shows considerable sequence similarity to three different enzymes of ascorbic acid biosynthesis: L-galactono-1,4-lactone dehydrogenase (EC 1.3.2.3) from higher plants, D-arabinono-1,4-lactone oxidase (EC 1.1.3.37 from Saccharomyces cerevisiae, and L-gulonolactone oxidase (EC 1.1.3.8) from mouse, as well as to a bacterial sorbitol oxidase. The class of compound acted on by members of this family is unknown.
Jiyao W et al.(2023). "The conserved domain database in 2023.",