Engineered CaM2 modulates nuclear calcium oscillation and enhances legume root nodule symbiosis.

Pablo Del Cerro, Nicola M Cook, Rik Huisman, Pierre Dangeville, Lauren E Grubb, Clemence Marchal, Anson Ho Ching Lam, Myriam Charpentier

Proceedings of the National Academy of Sciences of the United States of America 2022 Mar 29

filter terms:

SignificanceOscillations in intracellular calcium concentration play an essential role in the regulation of multiple cellular processes. In plants capable of root endosymbiosis with nitrogen-fixing bacteria and/or arbuscular mycorrhizal fungi, nuclear localized calcium oscillations are essential to transduce the microbial signal. Although the ion channels required to generate the nuclear localized calcium oscillations have been identified, their mechanisms of regulation are unknown. Here, we combined proteomics and engineering approaches to demonstrate that the calcium-bound form of the calmodulin 2 (CaM2) associates with CYCLIC NUCLEOTIDE GATED CHANNEL 15 (CNGC15s), closing the channels and providing the negative feedback to sustain the oscillatory mechanism. We further unraveled that the engineered CaM2 accelerates early endosymbioses and enhanced root nodule symbiosis but not arbuscular mycorrhization.

Citation

Pablo Del Cerro, Nicola M Cook, Rik Huisman, Pierre Dangeville, Lauren E Grubb, Clemence Marchal, Anson Ho Ching Lam, Myriam Charpentier. Engineered CaM2 modulates nuclear calcium oscillation and enhances legume root nodule symbiosis. Proceedings of the National Academy of Sciences of the United States of America. 2022 Mar 29;119(13):e2200099119