Member of the two-component regulatory system YvrG/YvrH that positively regulates 7 transcriptional units (wprA, wapA-yxxG, dltABCDE, sunA, sunT-bdbA-yolJ-bdbB, sigO-rsoA, and sigX-rsiX), and negatively regulates the lytABC operon. Probably activates YvrH by phosphorylation. ATP + protein L-histidine = ADP + protein N-phospho-L-histidine.