The transcriptional regulator LevR of Bacillus subtilis has domains homologous to both sigma 54- and phosphotransferase system-dependent regulators.
The regulatory gene levR of the levanase operon of Bacillus subtilis was cloned and sequenced. It encodes a polypeptide of Mr 106,064 with two domains homologous to members of two families of bacterial activators. One domain in LevR is homologous with one region of bacterial regulators including SacT and SacY of B. subtilis and BglG from Escherichia coli. Another domain of LevR is homologous to one part of the central domain of NifA and NtrC, which control nitrogen assimilation in Gram-negative bacteria. The levanase promoter contains two regions almost identical to the -12, -24 consensus regions present in sigma 54-dependent promoters. The expression of the levanase operon in E. coli was strongly dependent on sigma 54. Taken together, these results suggest that the operon is expressed from a -12, -24 promoter regulated by a sigma 54-like-dependent system in B. subtilis.
Débarbouillé
M
M
Unité de Biochimie Microbienne, URA 1300 du Centre National de la Recherche Scientifique, Paris, France.
Martin-Verstraete
I
I
Klier
A
A
Rapoport
G
G
D000595:Amino Acid Sequence; D001412:Bacillus subtilis / Q000201:enzymology / Q000235:genetics*; D001426:Bacterial Proteins / Q000235:genetics*; D001483:Base Sequence; D003001:Cloning, Molecular; D004269:DNA, Bacterial / Q000235:genetics; D004926:Escherichia coli / Q000235:genetics; D005809:Genes, Regulator; D006026:Glycoside Hydrolases / Q000235:genetics*; D008969:Molecular Sequence Data; D015345:Oligonucleotide Probes; D009876:Operon; D016133:Polymerase Chain Reaction; D011401:Promoter Regions, Genetic; D011993:Recombinant Fusion Proteins / Q000378:metabolism; D015183:Restriction Mapping; D012689:Sequence Homology, Nucleic Acid; D014157:Transcription Factors / Q000235:genetics*; D001616:beta-Galactosidase / Q000235:genetics / Q000378:metabolism
D001426:Bacterial Proteins; D004269:DNA, Bacterial; D015345:Oligonucleotide Probes; D011993:Recombinant Fusion Proteins; D014157:Transcription Factors; C067962:LevR protein, Bacillus subtilis; D006026:Glycoside Hydrolases; D001616:beta-Galactosidase; C021512:levanase