Nuclear-localized cyclic nucleotide-gated channels mediate symbiotic calcium oscillations
2016
Charpentier, Myriam | Sun, Jongho | Martins, Teresa Vaz | Radhakrishnan, Guru V. | Findlay, Kim | Soumpourou, Eleni | Thouin, Julien | Véry, Anne-Aliénor | Sanders, Dales | Morris, Richard J. | Oldroyd, Giles E. D. | Cell and Developmental Biology ; John Innes Centre [Norwich] ; Biotechnology and Biological Sciences Research Council (BBSRC)-Biotechnology and Biological Sciences Research Council (BBSRC) | Computational and Systems Biology ; John Innes Centre [Norwich] ; Biotechnology and Biological Sciences Research Council (BBSRC)-Biotechnology and Biological Sciences Research Council (BBSRC) | Biochimie et Physiologie Moléculaire des Plantes (BPMP) ; Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro) | Metabolic Biology ; John Innes Centre [Norwich] ; Biotechnology and Biological Sciences Research Council (BBSRC)-Biotechnology and Biological Sciences Research Council (BBSRC)
Nuclear-associated Ca2+ oscillationsmediate plant responses to beneficial microbial partners—namely, nitrogen-fixing rhizobial bacteria that colonize roots of legumes and arbuscular mycorrhizal fungi that colonize roots of the majority of plant species. A potassium-permeable channel is known to be required for symbiotic Ca2+ oscillations, but the calcium channels themselves have been unknown until now.We show that three cyclic nucleotide–gated channels in Medicago truncatula are required for nuclear Ca2+ oscillations and subsequent symbiotic responses.These cyclic nucleotide–gated channels are located at the nuclear envelope and are permeable to Ca2+.We demonstrate that the cyclic nucleotide–gated channels form a complex with the postassium-permeable channel, which modulates nuclear Ca2+ release. These channels, like their counterparts in animal cells, might regulate multiple nuclear Ca2+ responses to developmental and environmental conditions.
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