Phosphotransfer signal transduction between two regulatory factors involved in the osmoregulated kdp operon in Escherichia coli.
The proteins KdpD and KdpE are regulatory factors critically involved in the osmotic regulation of the kdpABC operon that is responsible for a high-affinity transport system in Escherichia coli. In this study, we obtained biochemical evidence supporting the view that the KdpD protein is a sensory protein kinase that exhibits autophosphorylation and KdpE-phosphotransfer characteristics. During the course of such studies we established a procedure for purifying the KdpE protein in large quantities. We also developed a procedure for preparing cytoplasmic membrane enriched with the KdpD protein that exhibits in vitro ability with regard to phosphorylation of KdpE protein.
Nakashima
K
K
Laboratory of Microbiology, School of Agriculture, Nagoya University, Japan.
Sugiura
A
A
Momoi
H
H
Mizuno
T
T
D001426:Bacterial Proteins / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D001692:Biological Transport; D002462:Cell Membrane / Q000378:metabolism; D004926:Escherichia coli / Q000235:genetics* / Q000378:metabolism; D029968:Escherichia coli Proteins; D008970:Molecular Weight; D009876:Operon; D009994:Osmolar Concentration; D010766:Phosphorylation; D011188:Potassium / Q000378:metabolism*; D011494:Protein Kinases / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D015398:Signal Transduction; D015534:Trans-Activators / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*
D001426:Bacterial Proteins; D029968:Escherichia coli Proteins; D015534:Trans-Activators; C075615:kdpE protein, E coli; C489580:KdpD protein, E coli; D011494:Protein Kinases; C075616:kdpD protein, Bacteria; D011188:Potassium