期刊
BIOELECTROCHEMISTRY
卷 76, 期 1-2, 页码 175-179出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.bioelechem.2009.04.002
关键词
Genetic modification; Yeast; Hansenula polymorpha; Flavocytochrome b(2); Mitochondrial respiratory chain; L-lactate respiration
资金
- German Academic Exchange Service (DAAD)
In general, L-lactate respiration is difficult to detect in living yeast cells due to the small activity of L-lactate oxidizing enzymes within the mitochondria. Genetically modified cells of methylotrophic yeast Hansenula polymorpha overproducing L-lactate: cytochrome c-oxidoreductase (EC 1.1.2.3, also known as flavocytochrome b(2), FC b(2)) were physically immobilized by means of a dialysis membrane onto various types of electrode materials in order to investigate the possibility of electrochemically detecting L-lactate respiration. It could be shown that in the case of genetically modified Hansenula polymorpha cells in contrast to cells from the parental strain, enhanced L-lactate-dependent respiration could be detected. Due to overproduction of FC b(2) the O-2 reduction current is decreased upon addition of L-lactate to the electrolyte solution. The electron transfer pathway in the L-lactate-dependent respiration process involves a cascade over three redox proteins, FC b(2), cytochrome c and Complex-IV, starting with L-lactate oxidation and ending with oxygen reduction. By means of selective inhibition of Complex IV with CN-, lactate respiration could be proven for causing the decrease in the O-2 reduction. (C) 2009 Elsevier B.V. All rights reserved.
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