Kinetic studies of the Bacillus subtilis ALDH-like ycbD protein, which is involved in d-glucarate/d-galactarate utilization, reveal that it is a NADP+-dependent, alpha-ketoglutaric semialdehyde dehydrogenase (KGSADH). KGSADHs (EC 1.2.1.26) catalyze the NAD(P)+-dependent conversion of KGSA to alpha-ketoglutarate. Interestingly, the NADP+-dependent, tetrameric, 2,5-dioxopentanoate dehydrogenase (EC=1.2.1.26), an enzyme involved in the catabolic pathway for D-arabinose in Sulfolobus solfataricus, also clusters in this group. This CD shows a distant phylogenetic relationship to the Azospirillum brasilense KGSADH-II (-III) group.
Jiyao W et al.(2023). "The conserved domain database in 2023.",