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Issue
Korean Journal of Chemical Engineering,
Vol.28, No.4, 1078-1084, 2011
Introduction of heterogeneous NADH reoxidation pathways into Torulopsis glabrata significantly increases pyruvate production efficiency
Qin Y, Johnson CH, Liu L, Chen J
The aim of this study was to increase pyruvate production efficiency in a multi - vitamin auxotrophic yeast, Torulopsis glabrata. This was achieved by decreasing intracellular NADH content through the introduction of two different NADH reoxidation pathways: one in the cytoplasm and the other in mitochondria. A nox (encoding a cytoplasmic H2O-forming NADH oxidase) and an AOX1 (encoding a mitochondrial alternative oxidase) were successfully expressed heterologously in T. glabrata, resulting in a decrease in the NADH and ATP contents of 55% and 26%, (in T. glabrata NOX) and 45% and 47% (in T. glabrata AOX), respectively. The decreases in nucleotide concentrations led to increases in the glucose consumption rate, the pyruvate yield and pyruvate productivity of 27%, 15% and 22% (in T. glabrata NOX) and 38%, 21%, and 29% (in T. glabrata AOX), respectively, compared with the corresponding values of the control. We conclude that this method provides an alternative way to enhance the production efficiency of NADHrelated metabolites.
Keywords: NADH; Torulopsis glabrata; Pyruvate; H2O-forming NADH Oxidase; Alternative Oxidase
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