Ethylene Receptors: Ethylene Perception and Signal Transduction
- 740 Downloads
Ethylene is sensed by a family of receptors that can be divided into two subfamilies based on phylogenetic analysis and some shared structural features. In this review we focus on the mechanistic aspects of how the receptors function in plants to transduce the ethylene signal. Recent work has led to new insights into how ethylene binds to the receptors and how this binding may induce a conformational change to regulate signaling. Additional studies point to several possible mechanisms for signal output by the receptors, which may involve changes in enzymatic activity and/or conformational changes. Other studies indicate the importance of interactions, both physical and genetic, between the receptors and early components of the signaling pathway, in particular, the Raf-like kinase CTR1, which functions as an integral component of the ethylene receptor signaling complex. The current model for signaling in Arabidopsis supports differing contributions from the receptors, with subfamily-1 receptors playing a more significant role than the subfamily-2 receptors in transmitting the ethylene signal.
KeywordsEthylene Receptors Signal transduction
The authors thank the Department of Energy (DE-FG02-05ER15704), the National Science Foundation (MCB-0430191), and the USDA-NRICGP (2004-35304-14907) for their research support.
- Abeles FB, Morgan PW, Saltveit ME Jr. 1992. Ethylene in Plant Biology. San Diego: Academic PressGoogle Scholar
- Binder BM, O’Malley RC, Wang W, Moore JM, Parks BM, Spalding EP, Bleecker AB. 2004b. Arabidopsis seedling growth response and recovery to ethylene. A kinetic analysis. Plant Physiol 136:2913–2920Google Scholar
- Neljubov DN. 1901. Uber die horizontale Nutation der Stengel von Pisum sativum und einiger anderen Pflanzen. Beih Bot Centralbl 10:128–139Google Scholar
- Schaller GE, Kieber JJ. 2002. Ethylene. In: Somerville C, Meyerowitz E. (eds). The Arabidopsis Book. Rockville, MD: American Society of Plant BiologistsGoogle Scholar
- Schaller GE, Mathews DE, Gribskov M, Walker JC 2002. Two-component signaling elements and histidyl-aspartyl phosphorelays. In: Somerville C, Meyerowitz E. (eds). The Arabidopsis Book. Rockville, MD: American Society of Plant Biologists, pp 1–9Google Scholar