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. 1977 Aug;131(2):463–472. doi: 10.1128/jb.131.2.463-472.1977

Partial purification of ferredoxin from Ruminococcus albus and its role in pyruvate metabolism and reduction of nicotinamide adenine dinucleotide by H2.

T L Glass, M P Bryant, M J Wolin
PMCID: PMC235452  PMID: 195928

Abstract

Extracts of Ruminococcus albus were not able to convert pyruvate to acetyl phosphate, CO2, and H2 after passage through a diethylaminoethyl (DEAE)-cellulose column. Activity was restored by a brown protein fraction eluted from the column with 0.4 M Cl-. The protein was partially purified and shown to have the spectral and biological characteristics of ferredoxin. R. albus ferredoxin, Clostridium pasteurianum ferredoxin, and methyl viologen restored activity for pyruvate decomposition by DEAE-cellulose-treated R. albus extracts. R. albus or C. pasteurianum ferredoxin restored the ability of DEAE-cellulose-treated C. pasteurianum extracts to form H2 and acetyl phosphate from pyruvate. Ferredoxin-free extracts of R. albus reduced nicotinamide adenine dinucleotide (NAD) when supplemented with R. albus or C. pasteurianum ferredoxin or with methyl viologen. These extracts reduced NADP with H2 poorly unless both ferredoxin and NAD were added, which indicates the presence of an NADH:NADP transhydrogenase. Flavin mononucleotide and flavin adenine dinucleotide were rapidly reduced by H2 by ferredoxin-free extracts in the absence of ferredoxin.

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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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