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KMID : 0545119960060040232
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Journal of Microbiology and Biotechnology
1996 Volume.6 No. 4 p.232 ~ p.237
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The Growth Yield of Desulfovibrio desulfuricans M6 on Different Substrates
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PARK, DOO-HYUN
SHIN, CHUL-SU/KIM, BYUNG-HONG/SHIN, PYUNG-KYUN
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Abstract
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Growth yield of Desulfovibrio desulfuricans M6 was measured using different substrates. The cell yield of fermentative growth on pyruvate was 6.22 g cell mol^-1 pyruvate. Since 1 ATP in available from substrate-level phosphorylation from the oxidation of pyruvate to acetate, Y_ATP of the bacterium should be the same as Y_ pyruvate (6.22 g cell mol^-1 ATP). The cell yield of the bacterium on different elecrton donors were measured with sulfate as the electron acceptor. Cell yields on lactate, pyruvate and H_2 were 9.39, 13.76 and 8.45 g cell mol^-1 substrate, respectively. From these ATP available from electron-transport phosphorylation (ETP) of the electron donors used was calculated. ATP produced by ETP of each electron donors was 1.71 from pyruvate, 1.51 from lactate and 1.76 from H_2. These values show that electrons from the oxidation of lactate to pyruvate are consumed to reduce sulfate through a reverse electron transport mechanism requiring 0.2 ATP for each pair of electrons. Based on these results, discussions are made on the electron transport mechanism in the bacterium.
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