Integration host factor is required for anaerobic pyruvate induction of pfl operon expression in Escherichia coli.
The expression of the pyruvate formate-lyase gene (pfl) is induced by anaerobic growth, and this is increased further by growth in pyruvate. Previous work has shown that anaerobic induction is strongly dependent on the activator FNR and partially dependent on a second transcription factor, ArcA, while pyruvate induction only required FNR. Anaerobic and pyruvate regulation both require the presence of a 5' nontranslated regulatory sequence which spans approximately 500 bp of DNA. A mobility shift assay was developed to identify proteins that bind to this regulatory region. Several binding activities were separated by heparin agarose chromatography, and one of these activities was characterized and shown to be integration host factor (IHF). Mobility shift and DNase I footprinting experiments defined a single IHF binding site in the pfl promoter-regulatory region. With pfl-lacZ fusions, it could be shown that introduction of a himD mutation abolished pyruvate-dependent induction of anaerobic expression in vivo. The same result was observed when the pfl IHF binding site was mutated. In addition, the partial anaerobic induction of expression found in an fnr strain was completely blocked in an fnr himD double mutant and in an fnr IHF binding site double mutant. Taken together, these data suggest that IHF is necessary for both pyruvate induction and the anaerobic induction mediated by ArcA.
Department of Biochemistry, State University of New York at Stony Brook 11794.
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Sirko
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Zehelein
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Freundlich
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Sawers
D000123:Acetyltransferases / Q000235:genetics*; D000693:Anaerobiosis; D001426:Bacterial Proteins / Q000378:metabolism*; D001483:Base Sequence; D001665:Binding Sites; D004269:DNA, Bacterial; D004268:DNA-Binding Proteins / Q000378:metabolism*; D003850:Deoxyribonuclease I; D004926:Escherichia coli / Q000201:enzymology / Q000235:genetics* / Q000254:growth & development; D015971:Gene Expression Regulation, Enzymologic; D034982:Integration Host Factors; D008969:Molecular Sequence Data; D009876:Operon; D010100:Oxygen / Q000378:metabolism; D011401:Promoter Regions, Genetic; D011773:Pyruvates / Q000378:metabolism*; D019289:Pyruvic Acid; D015183:Restriction Mapping
D001426:Bacterial Proteins; D004269:DNA, Bacterial; D004268:DNA-Binding Proteins; D034982:Integration Host Factors; D011773:Pyruvates; D019289:Pyruvic Acid; D000123:Acetyltransferases; C022560:formate C-acetyltransferase; D003850:Deoxyribonuclease I; D010100:Oxygen