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. 1973 May;114(2):767–771. doi: 10.1128/jb.114.2.767-771.1973

Enzyme Complex Which Couples Glycerol-3-Phosphate Dehydrogenation to Fumarate Reduction in Escherichia coli

K Miki 1, E C C Lin 1
PMCID: PMC251837  PMID: 4574699

Abstract

Anaerobic growth of Escherichia coli on glycerol as carbon source and fumarate as hydrogen acceptor results in the induction of both anaerobic sn-glycerol-3-phosphate (G3P) dehydrogenase and fumarate reductase. In previous studies, the G3P dehydrogenase was measured by the G3P-dependent reduction of a tetrazolium dye mediated by phenazine methosulfate in the presence of flavine mononucleotide and flavine adenine dinucleotide, and fumarate reductase was measured by the fumarate-dependent oxidation of reduced flavine mononucleotide. Results from the present study indicate that these two enzymes actually constitute a functional complex which is sedimentable at 200,000 × g in 2 h and which can catalyze the dehydrogenation of G3P at the expense of fumarate without any added cofactor. This coupling activity is not constituted by simply mixing an extract containing anaerobic G3P dehydrogenase with another extract containing fumarate reductase. Additional evidence for an organized complex is provided by the high degree of sensitivity of the coupled reaction to low concentrations of the detergents Triton X-100 and Emasol 1130 in comparison with the individual activities of the two component enzymes measured with the aid of artificial cofactors.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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