Plasmids bearing hfq and the hns-like gene stpA complement hns mutants in modulating arginine decarboxylase gene expression in Escherichia coli.
Biodegradative arginine decarboxylase is inducible by acid and is derepressed in an hns mutant. Several plasmids from an Escherichia coli library that could complement the hns phenotype were characterized and placed into groups. One group includes plasmids that contain the hns gene and are considered true complements. Another group was found to carry the hfq gene, which encodes the host factor HF-1 for bacteriophage Q beta replication. Plasmids of the third group contain inserts that mapped at 60.2 min on the E. coli chromosome. We identified an open reading frame (stpA) with a deduced amino acid sequence showing more than 60% identity with the sequences of H-NS proteins from several species as being responsible for the hns complementing phenotype of the third group.
Department of Biochemistry and Cell Biology, Rice University, Houston, Texas 77251.
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D000595:Amino Acid Sequence; D001425:Bacterial Outer Membrane Proteins / Q000235:genetics*; D001426:Bacterial Proteins / Q000235:genetics*; D001483:Base Sequence; D002262:Carboxy-Lyases / Q000096:biosynthesis / Q000235:genetics*; D002352:Carrier Proteins / Q000235:genetics*; D004268:DNA-Binding Proteins / Q000235:genetics*; D004926:Escherichia coli / Q000201:enzymology / Q000235:genetics*; D029968:Escherichia coli Proteins; D015964:Gene Expression Regulation, Bacterial; D015971:Gene Expression Regulation, Enzymologic; D005816:Genetic Complementation Test; D035001:Host Factor 1 Protein; D034982:Integration Host Factors; D018832:Molecular Chaperones; D008969:Molecular Sequence Data; D010641:Phenotype; D010957:Plasmids / Q000235:genetics; D015183:Restriction Mapping; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid
D001425:Bacterial Outer Membrane Proteins; D001426:Bacterial Proteins; D002352:Carrier Proteins; D004268:DNA-Binding Proteins; D029968:Escherichia coli Proteins; C031908:H-NS protein, bacteria; D035001:Host Factor 1 Protein; D034982:Integration Host Factors; D018832:Molecular Chaperones; C090104:StpA protein, E coli; C440502:integration host factor, E coli; D002262:Carboxy-Lyases; C019722:arginine decarboxylase