Protein Information

Name D lactate dehydrogenase
Synonyms D lactate dehydrogenase; DLD; LDHD; Lactate dehydrogenase D; Lactate dehydrogenase Ds

Compound Information

Name rotenone
CAS

Reference List

PubMed Abstract RScore(About this table)
15949980 Atlante A, de Bari L, Valenti D, Pizzuto R, Paventi G, Passarella S: Transport and metabolism of D-lactate in Jerusalem artichoke mitochondria. . Biochim Biophys Acta. 2005 Jun 1;1708(1):13-22. Epub 2005 Mar 31.

It was found that: 1) D-lactate can be synthesized by Jerusalem artichoke by virtue of the presence of glyoxalase II, the activity of which was measured photometrically in both isolated Jerusalem artichoke mitochondria and cytosolic fraction after the addition of S-D-lactoyl-glutathione. 2) Externally added D-lactate caused oxygen consumption by mitochondria, mitochondrial membrane potential increase and proton release, in processes that were insensitive to rotenone, but inhibited by both antimycin A and cyanide. 3) D-lactate was metabolized inside mitochondria by a flavoprotein, a putative D-lactate dehydrogenase, the activity of which could be measured photometrically in mitochondria treated with Triton X-100. 4) Jerusalem artichoke mitochondria can take up externally added D-lactate by means of a D-lactate/H (+) symporter investigated by measuring the rate of reduction of endogenous flavins.
82(1,1,1,2) Details
11955284 de Bari L, Atlante A, Guaragnella N, Principato G, Passarella S: D-Lactate transport and metabolism in rat liver mitochondria. . Biochem J. 2002 Jul 15;365(Pt 2):391-403.

We found the following: (1) externally added D-lactate causes oxygen uptake by mitochondria [P/O ratio (the ratio of mol of ATP synthesized to mol of oxygen atoms reduced to water during oxidative phosphorylation)=2] and membrane potential (Delta (psi)) generation in processes that are rotenone-insensitive, but inhibited by antimycin A and cyanide, and proton release from coupled mitochondria inhibited by alpha-cyanocinnamate, but not by phenylsuccinate; (2) the activity of the putative flavoprotein (D-lactate dehydrogenase) was detected in inside-out submitochondrial particles, but not in mitochondria and mitoplasts, as it is localized in the matrix phase of the mitochondrial inner membrane; (3) three novel separate translocators exist to mediate D-lactate traffic across the mitochondrial inner membrane: the D-lactate/H (+) symporter, which was investigated by measuring fluorimetrically the rate of endogenous flavin reduction, the D-lactate/oxoacid antiporter (which mediates both the D-lactate/pyruvate and D-lactate/oxaloacetate exchanges) and D-lactate/malate antiporter studied by monitoring photometrically the appearance of the D-lactate counteranions outside mitochondria.
The D-lactate translocators and the D-lactate dehydrogenase could account for the removal of the toxic methylglyoxal from cytosol, as well as for D-lactate-dependent gluconeogenesis.
1(0,0,0,1) Details