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J. Bacteriol., 10 1995, 5598-5605, Vol 177, No. 19
S Engelmann, C Lindner and M Hecker
A sigma B-dependent stress gene of Bacillus subtilis was localized
downstream of the licS gene. The predicted amino acid sequence exhibited a
significant similarity to the sequence of the katE-encoded catalase HPII of
Escherichia coli, and we designated it the open reading frame katE. In a B.
subtilis katE mutant, catalase 2 could not be detected. The amount of
katE-specific mRNA was increased after heat, salt, or ethanol stress or
after glucose starvation in a sigma B- dependent manner. As in E. coli, the
transcription of the katE gene in B. subtilis was unaffected by the
addition of H2O2 to exponentially growing cells. In contrast, the katA gene
encoding catalase 1 of B. subtilis showed an induction pattern different
from that of katE; katA expression was strongly increased by oxidative
stress. The similarity between E. coli sigma S-dependent genes and B.
subtilis sigma B- dependent genes suggests that both may confer multiple
stress resistance to stationary-phase cells.
Copyright © 1995, American Society for Microbiology
Cloning, nucleotide sequence, and regulation of katE encoding a sigma B- dependent catalase in Bacillus subtilis
Institut fur Mikrobiologie und Molekularbiologie, Ernst-Moritz-Arndt- Universitat, Greifswald, Germany.
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