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. 1990 Apr;172(4):2088–2095. doi: 10.1128/jb.172.4.2088-2095.1990

Purification of NADPH-dependent electron-transferring flavoproteins and N-terminal protein sequence data of dihydrolipoamide dehydrogenases from anaerobic, glycine-utilizing bacteria.

D Dietrichs 1, M Meyer 1, B Schmidt 1, J R Andreesen 1
PMCID: PMC208708  PMID: 2318809

Abstract

Three electron-transferring flavoproteins were purified to homogeneity from anaerobic, amino acid-utilizing bacteria (bacterium W6, Clostridium sporogenes, and Clostridium sticklandii), characterized, and compared with the dihydrolipoamide dehydrogenase of Eubacterium acidaminophilum. All the proteins were found to be dimers consisting of two identical subunits with a subunit Mr of about 35,000 and to contain about 1 mol of flavin adenine dinucleotide per subunit. Spectra of the oxidized proteins exhibited characteristic absorption of flavoproteins, and the reduced proteins showed an A580 indicating a neutral semiquinone. Many artificial electron acceptors, including methyl viologen, could be used with NADPH as the electron donor but not with NADH. Unlike the enzyme of E. acidaminophilum, which exhibited by itself a dihydrolipoamide dehydrogenase activity (W. Freudenberg, D. Dietrichs, H. Lebertz, and J. R. Andreesen, J. Bacteriol. 171:1346-1354, 1989), the electron-transferring flavoprotein purified from bacterium W6 reacted with lipoamide only under certain assay conditions, whereas the proteins of C. sporogenes and C. sticklandii exhibited no dihydrolipoamide dehydrogenase activity. The three homogeneous electron-transferring flavoproteins were very similar in their structural and biochemical properties to the dihydrolipoamide dehydrogenase of E. acidaminophilum and exhibited cross-reaction with antibodies raised against the latter enzyme. N-terminal sequence analysis demonstrated a high degree of homology between the dihydrolipoamide dehydrogenase of E. acidaminophilum and the electron-transferring flavoprotein of C. sporogenes to the thioredoxin reductase of Escherichia coli. Unlike these proteins, the dihydrolipoamide dehydrogenases purified from the anaerobic, glycine-utilizing bacteria Peptostreptococcus glycinophilus, Clostridium cylindrosporum, and C. sporogenes exhibited a high homology to dihydrolipoamide dehydrogenases known from other organisms.

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Selected References

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