Journal article
Nodulation independent of rhizobia induced by a calcium-activated kinase lacking autoinhibition
Nature (London), Vol.441(7097), pp.1149-1152
06/29/2006
Handle:
https://hdl.handle.net/2376/109101
PMID: 16810256
Abstract
Legumes, such as Medicago truncatula, form mutualistic symbiotic relationships with nitrogen-fixing rhizobial bacteria. This occurs within specialized root organs--nodules--that provide the conditions required for nitrogen fixation. A rhizobium-derived signalling molecule, Nod factor, is required to establish the symbiosis. Perception of Nod factor in the plant leads to the induction of Ca2+ oscillations, and the transduction of this Ca2+ signal requires DMI3 (refs 2, 3), which encodes the protein kinase Ca2+/calmodulin-dependent protein kinase (CCaMK). Central to the regulation of CCaMK is an autoinhibitory domain that negatively regulates kinase activity. Here we show that the specific removal of the autoinhibition domain leads to the autoactivation of the nodulation signalling pathway in the plant, with the resultant induction of nodules and nodulation gene expression in the absence of bacterial elicitation. This autoactivation requires nodulation-specific transcriptional regulators in the GRAS family. This work demonstrates that the release of autoinhibition from CCaMK after calmodulin binding is a central switch that is sufficient to activate nodule morphogenesis. The fact that a single regulation event is sufficient to induce nodulation highlights the possibility of transferring this process to non-legumes.
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Details
- Title
- Nodulation independent of rhizobia induced by a calcium-activated kinase lacking autoinhibition
- Creators
- Cynthia GleasonShubho ChaudhuriTianbao YangAlfonso MuñozB W PoovaiahGiles E D Oldroyd
- Publication Details
- Nature (London), Vol.441(7097), pp.1149-1152
- Academic Unit
- Horticulture, Department of; Plant Pathology, Department of
- Publisher
- England
- Identifiers
- 99900547103101842
- Language
- English
- Resource Type
- Journal article