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1、ARTICLEDOI:10.1038/s41467-017-02468-2OPENRedoxregulationofPEPactivityduringseedlingestablishmentinArabidopsisthalianaManuelGuineaDíaz1,2,TamaraHernández-Verdeja1,DmitryKremnev1,TimCrawford1,CaroleDubreuil1&ÅsaStrand1Activationoftheplastid-encodedRNApolymeraseistightlycontrolledandinvol
2、vesanetworkofphosphorylationand,asyetunidentified,thiol-mediatedevents.Here,wecharacterize1234567890PLASTIDREDOXINSENSITIVE2,aredox-regulatedproteinrequiredforfullPEP-driventran-scription.PRIN2dimerscanbereducedintotheactivemonomericformbythioredoxinsthroughreductionofadisulfidebond.Expo
3、suretolightincreasestheratiobetweenthemonomericanddimericformsofPRIN2.Complementationofprin2-2withdifferentPRIN2proteinvariantsdemonstratesthatthemonomerisrequiredforlight-activatedPEP-dependenttranscriptionandthatexpressionofthenuclear-encodedphotosynthesisgenesislinkedtotheactivityof
4、PEP.ActivationofPEPduringchloroplastdevelopmentlikelyisthesourceofaretrogradesignalthatpromotesnuclearLHCBexpression.Thus,regulationofPRIN2isthethiol-mediatedmechanismrequiredforfullPEPactivity,withPRIN2monomerizationviareductionbyTRXsprovidingamechanisticlinkbetweenphotosyntheticelect
5、rontransportandactivationofphotosyntheticgeneexpression.1UmeåPlantScienceCentre,DepartmentofPlantPhysiology,UmeåUniversity,SE-90187Umeå,Sweden.2Presentaddress:MolecularPlantBiology,UniversityofTurku,FI-20520Turku,Finland.ManuelGuineaDíazandTamaraHernández-Verdejacontributedequallytothi
6、swork.CorrespondenceandrequestsformaterialsshouldbeaddressedtoÅ.S.(email:Asa.Strand@umu.se)NATURECOMMUNICATIONS
7、(2018)9:50
8、DOI:10.1038/s41467-017-02468-2
9、www.nature.com/naturecommunications1ARTICLENATURECOMMUNICATIONS
10、DOI:10.1038/s41467-017-02468-2nadditiontobeingtheprimaryenergysource
11、forplants,allelesbothdemonstratedimpairedregulationofphotosynthesis-lightalsoprovidesplantswithinformationtocontrolassociatednucleargenes(PhANGs)whenexposedtoexcesslight,Iprocessessuchaschloroplastdevelopmentandseedlingorwhenphotosyntheticelectrontransport(PET)24wasinhibited.establis
