| 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. |
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