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Negative control in two‐component signal transduction results from sensor transmitter phosphatase activity for phospho‐receiver dephosphorylation. A hypothetical mechanism for this reaction involves a catalytic residue in the H‐box active‐site region. However, a complete understanding of transmitter phosphatase regulation is hampered by the abundance of kinase‐competent, phosphatase‐defective missense...
The NarX–NarL and NarQ–NarP sensor–response regulator pairs control Escherichia coli gene expression in response to nitrate and nitrite. Previous analysis suggests that the Nar two‐component systems form a cross‐regulation network in vivo. Here we report on the kinetics of phosphoryl transfer between different sensor–regulator combinations in vitro. NarX exhibited a noticeable kinetic preference for...
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