How important is the phosphatase activity of sensor kinases?
In two-component signaling systems, phosphorylated response regulators (RRs) are often dephosphorylated by their partner kinases in order to control the in vivo concentration of phospho-RR (RR approximately P). This activity is easily demonstrated in vitro, but these experiments have typically used very high concentrations of the histidine kinase (HK) compared to the RR approximately P. Many two-component systems exhibit exquisite control over the ratio of HK to RR in vivo. The question thus arises as to whether the phosphatase activity of HKs is significant in vivo. This topic will be explored in the present review.
Kenney
Linda J
LJ
Department of Microbiology & Immunology, University of Illinois at Chicago, 835 S. Wolcott St. M/C 790, Chicago, IL 60612, USA. kenneyl@uic.edu
D001419:Bacteria / Q000201:enzymology* / Q000235:genetics / Q000378:metabolism; D001426:Bacterial Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D001665:Binding Sites; D015964:Gene Expression Regulation, Bacterial; D000071677:Histidine Kinase; D008958:Models, Molecular; D010744:Phosphoric Monoester Hydrolases / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D011494:Protein Kinases / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D015398:Signal Transduction
D001426:Bacterial Proteins; D011494:Protein Kinases; D000071677:Histidine Kinase; D010744:Phosphoric Monoester Hydrolases