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J. Bacteriol., 12 1997, 7671-7678, Vol 179, No. 24
Copyright © 1997, American Society for Microbiology

Involvement of CysB and Cbl regulatory proteins in expression of the tauABCD operon and other sulfate starvation-inducible genes in Escherichia coli

JR van der Ploeg, R Iwanicka-Nowicka, MA Kertesz, T Leisinger and MM Hryniewicz
Mikrobiologisches Institut, Swiss Federal Institute of Technology, ETH- Zentrum, Zurich.

Starvation for sulfate results in increased synthesis of several proteins in Escherichia coli. Among these Ssi (sulfate starvation- induced) proteins are the products of the tauABCD genes, which are required for utilization of taurine as sulfur source for growth. In this study, the role of the cbl gene in expression of tauABCD and other ssi genes was investigated. The protein encoded by cbl shows high sequence similarity to CysB, the LysR-type transcriptional activator of the genes involved in cysteine biosynthesis. Strain EC2541, which contains an internal deletion in cbl, was unable to utilize taurine and other aliphatic sulfonates as sulfur sources. Two-dimensional sodium dodecyl sulfate-polyacrylamide gel electrophoresis showed that many of the Ssi proteins were not synthesized in EC2541. Expression of a translational tauD'-'lacZ fusion required the presence of both cbl and cysB. The interactions of CysB and Cbl with the promoter region of tauABCD were studied by using gel mobility shift experiments and DNase I footprinting. CysB occupied multiple binding sites, whereas Cbl occupied only one site from 112 to 68 bp upstream of the transcription start site. Acetylserine, the inducer of transcription of CysB- regulated genes, stimulated binding of CysB but not of Cbl. Sulfate had no effect on binding of both proteins to the tauABCD promoter region. These results indicate that Cbl is a transcription factor for genes required for sulfonate-sulfur utilization and maybe for other genes whose expression is induced by sulfate starvation.


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