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• W1493721507 abstract "E2 (dihydrolipoamide acetyltransferase) and E3 (dihydrolipoamide dehydrogenase) of the Clostridium magnum acetoin dehydrogenase enzyme system were copurified in a three-step procedure from acetoin-grown cells. The denatured E2-E3 preparation comprised two polypeptides with M(r)s of 49,000 and 67,000, respectively. Microsequencing of both proteins revealed identical amino acid sequences. By use of oligonucleotide probes based on the N-terminal sequences of the alpha and beta subunits of E1 (acetoin dehydrogenase, thymine PPi dependent), which were purified recently (H. Lorenzl, F.B. Oppermann, B. Schmidt, and A. Steinbüchel, Antonie van Leeuwenhoek 63:219-225, 1993), and of E2-E3, structural genes acoA (encoding E1 alpha), acoB (encoding E1 beta), acoC (encoding E2), and acoL (encoding E3) were identified on a single ClaI restriction fragment and expressed in Escherichia coli. The nucleotide sequences of acoA (978 bp), acoB (999 bp), acoC (1,332 bp), and acoL (1,734 bp), as well as those of acoX (996 bp) and acoR (1,956 bp), were determined. The amino acid sequences deduced from acoA, acoB, acoC, and acoL for E1 alpha (M(r), 35,532), E1 beta (M(r), 35,541), E2 (M(r), 48,149), and E3 (M(r), 61,255) exhibited striking similarities to the amino acid sequences of the corresponding components of the Pelobacter carbinolicus acetoin dehydrogenase enzyme system and the Alcaligenes eutrophus acetoin-cleaving system, respectively. Significant homologies to the enzyme components of various 2-oxo acid dehydrogenase complexes were also found, indicating a close relationship between the two enzyme systems. As a result of the partial repetition of the 5' coding region of acoC into the corresponding part of acoL, the E3 component of the C. magnum acetoin dehydrogenase enzyme system contains an N-terminal lipoyl domain, which is unique among dihydrolipoamide dehydrogenases. We found strong similarities between the AcoR and AcoX sequences and the A. eutrophus acoR gene product, which is a regulatory protein required for expression of the A. eutrophus aco genes, and the A. eutrophus acoX gene product, which has an unknown function, respectively. The aco genes of C. magnum are probably organized in one single operon (acoABXCL); acoR maps upstream of this operon." @default.
• W1493721507 created "2016-06-24" @default.
• W1493721507 creator A5008459822 @default.
• W1493721507 creator A5009151209 @default.
• W1493721507 creator A5016454927 @default.
• W1493721507 creator A5076768521 @default.
• W1493721507 date "1994-06-01" @default.
• W1493721507 modified "2023-09-23" @default.
• W1493721507 title "Biochemical and molecular characterization of the Clostridium magnum acetoin dehydrogenase enzyme system" @default.
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• W1493721507 doi "https://doi.org/10.1128/jb.176.12.3614-3630.1994" @default.
• W1493721507 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/205551" @default.
• W1493721507 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/8206840" @default.
• W1493721507 hasPublicationYear "1994" @default.
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