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Journal of Bacteriology, March 2001, p. 1938-1944, Vol. 183, No. 6
Department of Biochemistry and Molecular
Biology, Oregon Graduate Institute of Science and Technology,
Beaverton, Oregon 97006
Received 15 September 2000/Accepted 20 December 2000
The ResD-ResE signal transduction system is required for aerobic
and anaerobic respiration in Bacillus subtilis. The
histidine sensor kinase ResE, by functioning as a kinase and a
phosphatase for the cognate response regulator ResD, controls the level
of phosphorylated ResD. A high level of phosphorylated ResD is
postulated to cause a dramatic increase in transcription of
ResDE-controlled genes under anaerobic conditions. A mutant ResE, which
retains autophosphorylation and ResD phosphorylation activities but is defective in ResD dephosphorylation, allowed partially derepressed aerobic expression of the ResDE-controlled genes. The result indicates that phosphatase activity of ResE is regulated by oxygen availability and anaerobic induction of the ResDE regulon is partly due to a
reduction of the ResE phosphatase activity during anaerobiosis. That
elimination of phosphatase activity does not result in complete aerobic
derepression suggests that the ResE kinase activity is also subject to
control in response to oxygen limitation.
0021-9193/01/$04.00+0 DOI: 10.1128/JB.183.6.1938-1944.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
Involvement of ResE Phosphatase Activity in
Down-Regulation of ResD-Controlled Genes in Bacillus
subtilis during Aerobic Growth
*
Corresponding author. Mailing address: Department of
Biochemistry and Molecular Biology, Oregon Graduate Institute of
Science and Technology, 20000 N.W. Walker Road, Beaverton, OR 97006. Phone: (503) 748-4078. Fax: (503) 748-1464. E-mail:
mnakano{at}bmb.ogi.edu.
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