Journal of Bacteriology, July 2000, p. 3858-3862, Vol. 182, No. 13
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Department of Microbiology and Molecular Genetics, Harvard Medical School, Boston, Massachusetts 02115
Received 7 February 2000/Accepted 11 April 2000
The Arc two-component system, comprising a tripartite sensor kinase (ArcB) and a response regulator (ArcA), modulates the expression of numerous genes involved in respiratory functions. In this study, the steps of phosphoryl group transfer from phosphorylated ArcB to ArcA were examined in vivo by using single copies of wild-type and mutant arcB alleles. The results indicate that the signal transmission occurs solely by His-Asp-His-Asp phosphorelay.
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