The enzyme from mammalian kidney contains one mole of FAD per mole of enzyme.(R)-lactate, (R)-malate and meso-tartrate are good substrates. Ubiquinone-1 and the dye 2,6-dichloroindophenol can act as acceptors; NAD+ and NADP+ are not acceptors.
The expected taxonomic range for this enzyme is: Bacteria, Eukaryota
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SYSTEMATIC NAME
IUBMB Comments
(R)-2-hydroxyacid:quinone oxidoreductase
The enzyme from mammalian kidney contains one mole of FAD per mole of enzyme.(R)-lactate, (R)-malate and meso-tartrate are good substrates. Ubiquinone-1 and the dye 2,6-dichloroindophenol can act as acceptors; NAD+ and NADP+ are not acceptors.
Substrates: ordered mechanism, first D-lactate and then 2,6-dichlorophenol-indophenol bind to the enzyme to form a ternary complex, from which pyruvate and reduced 2,6-dichlorophenol-indophenol dissociate in that oder Products: -
Substrates: the enzyme exhibits narrow substrate specificity. No activity with D-2-hydroxybutyrate, L-2-hydroxybutyrate, D-mandelate, L-mandelate, D-3-phenyllactate, D-glycerate, L-glycerate, DL-2-hydroxyisocaproate, and DL-2-hydroxyoctanoate, with 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide as an electron acceptor Products: -
the enzyme contains an Fe-S oxidoreductase domain. The Fe-S oxidoreductase domain functions as an electron transfer component to facilitate the utilization of quinone as an electron acceptor by the enzyme (Fe-S D-iLDH), and it helps the enzyme associate with the cell membrane
the purified enzyme has a spectrum typical of a flavoprotein. The change induced in the spectrum on addition of D-malate or D-lactate suggests the formation of a flavin semiquinone. Flavin can be removed by treatment with acid ammonium sulfate, and activity can be restored to the inactive apoenzyme by addition of FAD, but not of FMN or riboflavin
the enzyme contains a flavin adenine dinucleotide (FAD)-containing dehydrogenase domain. Compared to the intact enzyme, the FAD-containing dehydrogenase domain shows increased catalytic efficiency with cytochrome c as the electron acceptor, but it completely loses the ability to use coenzyme Q10. The FAD containing dehydrogenase domain is no longer associated with the cell membrane, and it can not support the utilization of D-lactate as a carbon source
inactivation results in loss of the ability to grow with D-lactate. Heterologous expression in Corynebacterium efficiens enables this species to grow with D-lactate as sole carbon source
inactivation results in loss of the ability to grow with D-lactate. Heterologous expression in Corynebacterium efficiens enables this species to grow with D-lactate as sole carbon source
Jiang, T.; Guo, X.; Yan, J.; Zhang, Y.; Wang, Y.; Zhang, M.; Sheng, B.; Ma, C.; Xu, P.; Gao, C.
A bacterial multidomain NAD-independent D-lactate dehydrogenase utilizes flavin adenine dinucleotide and Fe-S clusters as cofactors and quinone as an electron acceptor for D-lactate oxidization