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Hydrogen peroxide sulfenylates and inhibits the photorespiratory enzyme PGLP1 to modulate plant thermotolerance

Plant Communications 2024年第6期5卷 139-153页

作者： Zheng-Wei Fu Feng Ding Bing-Lei Zhang Wen-Cheng Liu Zi-Hong Huang Shi-Hang Fan Yu-Rui Feng Ying-Tang Lu Wei Hua Key Laboratory of Biology and Genetic Improvement of Oil Crops Ministry of Agriculture and Rural AffairsOil Crops Research Institute of the Chinese Academy of Agricultural SciencesWuhan 430062China State Key Laboratory of Hybrid Rice College of Life SciencesWuhan UniversityWuhan 430072China School of Landscape and Ecological Engineering Hebei University of EngineeringHandan 056038China State Key Laboratory of Crop Stress Adaptation and Improvement School of Life SciencesHenan UniversityKaifeng 475004China Hubei Hongshan Laboratory Wuhan 430070China

Climate change is resulting in more frequent and rapidly changing temperatures at both extremes that severely affect the growth and production of plants,particularly *** stress caused by high temperatures is one of the most damaging factors for ***,the role of hydrogen peroxide(H_(2)O_(2))in modulating plant thermotolerance is largely unknown,and the regulation of photorespiration essential for C3 species remains to be fully ***,we report that heat stress promotes H2O2 accumulation in chloroplasts and that H2O2 stimulates sulfenylation of the chloroplast-localized photorespiratory enzyme 2-phosphoglycolate phosphatase 1(PGLP1)at cysteine 86,inhibiting its activity and promoting the accumulation of the toxic metabolite *** also demonstrate that PGLP1 has a positive function in plant thermotolerance,as PGLP1 antisense lines have greater heat sensitivity and PGLP1-overexpressing plants have higher heat-stress tolerance than the wild ***,our results demonstrate that heat-induced H2O2 in chloroplasts sulfenylates and inhibits PGLP1 to modulate plant ***,targeting CATALASE2 to chloroplasts can largely prevent the heatinduced overaccumulation of H2O2 and the sulfenylation of PGLP1,thus conferring thermotolerance without a plant growth *** findings reveal that heat-induced H2O2 in chloroplasts is important for heat-caused plant damage.

关键词： heat stress photorespiration hydrogen peroxide PGLP1 2-phosphoglycolate

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Coordinating carbon and nitrogen metabolic signaling through the cyanobacterial global repressor NdhR

Coordinating carbon and nitrogen metabolic signaling through...

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华东地区生物化学与分子生物学学会联合会2017年学术交流会暨安徽省生物化学与分子生物学学会理事会议

作者： Yong-Liang Jiang Xue-Ping Wang Hui Sun Cheng-Cai Zhang Yuxing Chen Cong-Zhao Zhou School of Life Sciences and Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of China Key Laboratory of Structural Biology Chinese Academy of Science Key Laboratory of Algal Biology Institute of HydrobiologyChinese Academy of Sciences

The coordination of carbon and nitrogen metabolism is essential for bacteria to adapt to nutritional variations in the environments,but the underlying mechanism remains poorly *** autotrophic cyanobacteria,high level of CO favors the carboxylase activity of ribulose 1,5 bisphosphate carboxylase/oxygenase(RubisCO) to produce3-phophoglycerate,whereas low CO levels promote the oxygenase activity of RubisCO leading to 2-phosphoglycolate(2-PG) *** 2-PG level is reversely correlated to that of 2-oxoglutarate(2-OG) which accumulates under high C/N ratio and acts as a nitrogen starvation *** LysR-type transcriptional repressor NdhR controls the expression of genes related to carbon *** on genetic and biochemical studies,we report here that 2-OG and 2-PG are co-repressor and inducer of NdhR,***,structural analyses indicate that binding of 2-OG at the interface between the two regulatory domains(RD) allows NdhR tetramer to adopt a repressor conformation,whereas 2-PG binding to an intra-domain cleft of each RD triggers drastic conformational changes leading to the dissociation of NdhR from its target *** further confirmed the in vivo effect of 2-PG or the 2-OG levels on the transcription of the NdhR *** together,we propose that NdhR can sense 2-OG from the Krebs cycle and 2-PG from photorespiration,two key metabolites that function together as indicators of intracellular C/N status;thus representing a fine sensor for the coordination of carbon and nitrogen metabolism in cyanobacteria.

关键词： carbon and nitrogen metabolism transcription factor cyanobacteria 2-oxoglutarate 2-phosphoglycolate

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