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  • 1
    Electronic Resource
    Electronic Resource
    The organization of the fuc regulon specifying l-fucose dissimilation in Escherichia coli K12 as determined by gene cloning (1987)
    Springer
    Molecular genetics and genomics 210 (1987), S. 331-337 
    Details
    ISSN: 1617-4623
    Keywords: fuc regulon ; Genetic map ; Transcription
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary In Escherichia coli the six known genes specifying the utilization of l-fucose as carbon and energy source cluster at 60.2 min and constitute a regulon. These genes include fucP (encoding l-fucose permease), fucI (encoding l-fucose isomerase), fucK (encoding l-fuculose kinase), fucA (encoding l-fuculose 1-phosphate aldolase), fucO (encoding l-1,2-propanediol oxidoreductase), and fucR (encoding the regulatory protein). In this study the fuc genes were cloned and their positions on the chromosome were established by restriction endonuclease and complementation analyses. Clockwise, the gene order is: fucO-fucA-fucP-fucI-fucK-fucR. The operons comprising the structural genes and the direction of transcription were determined by complementation analysis and Southern blot hybridization. The fuc-PIK and fucA operons are transcribed clockwise. The fucO operon is transcribed counterclockwise. The fucR gene product activates the three structural operons in trans.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00325702
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The requirement of ArcA and Fnr for peak expression of the cyd operon in Escherichia coli under microaerobic conditions (1991)
    Springer
    Molecular genetics and genomics 226 (1991), S. 209-213 
    Details
    ISSN: 1617-4623
    Keywords: Microaerobiosis ; cyd ; arcA ; fnr ; Escherichia coli
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Transcriptional regulation of cyd, encoding the cytochrome d complex for O2 scavenging, was studied in Escherichia coli by monitoring ϕ(cyd-lac) expression under atmospheres containing 0–21% O2. Peak expression of this operon occurred under microaerobic conditions. Mutations in arcA (a trans-acting regulatory gene involved in aerobic respiration) greatly lowered ϕ(cyd-lac) expression under all conditions. Mutations in fnr (a trans-acting regulatory gene involved in anaerobic respiration) shifted the pattern of ϕ(cyd-lac) expression, lowering the microaerobic and aerobic expression. In an arcA fnr double mutant, ϕ(cyd-lac) expression became insignificant, irrespective of the availability of O2. It thus appears that the expression of the ϕ(cyd-lac) operon is under dual control by the two pleiotropic activators, ArcA and Fnr, which interact to give the peak microaerobic expression.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00273605
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    Paper (German National Licenses)
    Fulltext
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