Ethylene and cytokinin signalling in plants: the role of two-component systems.
Two-component systems involve the use of histidine kinases and response-regulator proteins, and allow for the perception of a variety of signals. ETR1 is an ethylene receptor in plants, and contains domains with sequence similarity to histidine kinases and response regulators. Ethylene signalling involves a phosphorylation cascade, employing both histidine kinases and serine/threonine kinases. CKI1 is involved in the cytokinin signalling pathway in plants, and contains domains with sequence similarity to histidine kinases and response regulators. The identification of two-component systems in eukaryotes indicates that this is a general signalling mechanism, not limited solely to prokaryotes.
Schaller
G E
GE
Department of Biochemistry and Molecular Biology, University of New Hampshire, Durham 03824, USA.
D029681:Arabidopsis Proteins; D003583:Cytokinins / Q000378:metabolism*; D005030:Ethylenes / Q000378:metabolism*; D008954:Models, Biological; D009154:Mutation; D010940:Plant Proteins / Q000737:chemistry / Q000378:metabolism; D010944:Plants / Q000235:genetics* / Q000378:metabolism*; D011494:Protein Kinases / Q000737:chemistry / Q000378:metabolism; D011956:Receptors, Cell Surface / Q000737:chemistry / Q000378:metabolism; D015398:Signal Transduction
D029681:Arabidopsis Proteins; D003583:Cytokinins; D005030:Ethylenes; D010940:Plant Proteins; D011956:Receptors, Cell Surface; C083750:ethylene receptors, plant; C036216:ethylene; D011494:Protein Kinases; C101990:CKI1 protein, Arabidopsis