The carboxy-terminal portion of the CheA kinase mediates regulation of autophosphorylation by transducer and CheW.
The CheA kinase is a central protein in the signal transduction network that controls chemotaxis in Escherichia coli. CheA receives information from a transmembrane receptor (e.g., Tar) and CheW proteins and relays it to the CheB and CheY proteins. The biochemical activities of CheA proteins truncated at various distances from the carboxy terminus were examined. The carboxy-terminal portion of CheA regulates autophosphorylation in response to environmental signals transmitted through Tar and CheW. The central portion of CheA is required for autophosphorylation and is also presumably involved in dimer formation. The amino-terminal portion of CheA was previously shown to contain the site of autophosphorylation and to be able to transfer the phosphoryl group to CheB and CheY. These studies further delineate three functional domains of the CheA protein.
Bourret
R B
RB
Division of Biology, California Institute of Technology, Pasadena 91125.
Davagnino
J
J
Simon
M I
MI
D001426:Bacterial Proteins / Q000378:metabolism*; D002633:Chemotaxis / Q000235:genetics*; D004252:DNA Mutational Analysis; D004926:Escherichia coli / Q000201:enzymology / Q000235:genetics*; D029968:Escherichia coli Proteins; D000071677:Histidine Kinase; D008565:Membrane Proteins / Q000378:metabolism*; D000072236:Methyl-Accepting Chemotaxis Proteins; D008957:Models, Genetic; D010766:Phosphorylation; D010770:Phosphotransferases / Q000378:metabolism; D015398:Signal Transduction / Q000235:genetics*; D013329:Structure-Activity Relationship
D001426:Bacterial Proteins; C489103:CheW protein, E coli; D029968:Escherichia coli Proteins; D008565:Membrane Proteins; D000072236:Methyl-Accepting Chemotaxis Proteins; C000607606:cheY protein, E coli; C051236:CheW protein, Bacteria; D010770:Phosphotransferases; D000071677:Histidine Kinase; C000607608:cheA protein, E coli