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EnvZ is a cytoplasmic membrane protein which is involved in osmoregulatory expression of the ompF and ompC genes in Escherichia coli possibly by sensing the environmental osmotic signal. A truncated form of the EnvZ protein (EnvZ*), comprising 82% of EnvZ starting from the C terminus, was purified to homogeneity. The purified EnvZ* was autophosphorylated with ATP. The phosphoryl group on EnvZ* could then be rapidly transferred to OmpR, which is a positive regulator of the ompF and ompC genes and which was proposed to interact with EnvZ in the process of osmoregulation. In the presence of ATP, the phosphorylated OmpR was rapidly dephosphorylated. These results suggest that the transfer of the phosphoryl group between EnvZ and OmpR plays an important role in the signaling pathway in osmoregulation.
Aiba et al. (Mon,) studied this question.