Plant peroxisomes have the capacity to gen erate different reactive oxygen and nitrogen species(ROS and RNS),such as H2O2,superoxide radical(O2^·-),nitric oxide and peroxynitrite(ONOO^-).These organelles have an ...Plant peroxisomes have the capacity to gen erate different reactive oxygen and nitrogen species(ROS and RNS),such as H2O2,superoxide radical(O2^·-),nitric oxide and peroxynitrite(ONOO^-).These organelles have an active nitrooxidative metabolism which can be exacerbated by adverse stress conditions.Hydrogen sulfide(H2S)is a new signaling gasotransmitter which can mediate the posttranslational modification(PTM)persulfidation.We used Arabidopsis thaliana transgenic seedlings expressing cyan fluorescent protein(CFP)fused to a canonical peroxisome targeting signal 1(PTS1)to visualize peroxisomes in living cells,as well as a specific fluorescent probe which showed that peroxisomes contain H2S.H2S was also detected in chloroplasts under glyphosate-induced oxidative stress conditions.Peroxisomal enzyme activities,including catalase,photorespiratory H2O2-generating glycolate oxidase(GOX)and hydroxypyruvate reductase(HPR),were assayed in vitro with a H2S donor.In line with the persulfidation of this enzyme,catalase activity declined significantly in the presence of the H2S donor.To corroborate the inhibitory effect of H2S on catalase activity,we also assayed pure catalase from bovine liver and pepper fruit-enriched samples,in which catalase activity was inhibited.Taken together,these data provide evidenee of the presence of H2S in plant peroxisomes which appears to regulate catalase activity and,consequently,the peroxisomal H2O2 metabolism.展开更多
基金The project AGL2015-65104-P (ERDF grants co-financed by the Spanish Ministry of Economy and Competitiveness) supports the research in the laboratory of FJC, SGG, MAMV and JMPthe grant BIO2015-66390-P for JBBs laboratory
文摘Plant peroxisomes have the capacity to gen erate different reactive oxygen and nitrogen species(ROS and RNS),such as H2O2,superoxide radical(O2^·-),nitric oxide and peroxynitrite(ONOO^-).These organelles have an active nitrooxidative metabolism which can be exacerbated by adverse stress conditions.Hydrogen sulfide(H2S)is a new signaling gasotransmitter which can mediate the posttranslational modification(PTM)persulfidation.We used Arabidopsis thaliana transgenic seedlings expressing cyan fluorescent protein(CFP)fused to a canonical peroxisome targeting signal 1(PTS1)to visualize peroxisomes in living cells,as well as a specific fluorescent probe which showed that peroxisomes contain H2S.H2S was also detected in chloroplasts under glyphosate-induced oxidative stress conditions.Peroxisomal enzyme activities,including catalase,photorespiratory H2O2-generating glycolate oxidase(GOX)and hydroxypyruvate reductase(HPR),were assayed in vitro with a H2S donor.In line with the persulfidation of this enzyme,catalase activity declined significantly in the presence of the H2S donor.To corroborate the inhibitory effect of H2S on catalase activity,we also assayed pure catalase from bovine liver and pepper fruit-enriched samples,in which catalase activity was inhibited.Taken together,these data provide evidenee of the presence of H2S in plant peroxisomes which appears to regulate catalase activity and,consequently,the peroxisomal H2O2 metabolism.
