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- W2261214933 abstract "Arabidopsis thaliana is an established model plant system for studying plantpathogeninteractions. The knowledge garnered from examining the mechanism ofinduced disease resistance in this model system can be applied to eliminate the cost anddanger associated with current means of crop protection.A specific defense pathway, known as systemic acquired resistance (SAR),involves whole plant protection from a wide variety of bacterial, viral and fungalpathogens and remains induced weeks to months after being triggered. The ability ofArabidopsis to mount SAR depends on the accumulation of salicylic acid (SA), the NPRI(non-expressor of pathogenesis related gene 1) protein and the expression of a subset ofpathogenesis related (PR) genes. NPRI exerts its effect in this pathway throughinteraction with a closely related class of bZIP transcription factors known as TGAfactors, which are named for their recognition of the cognate DNA motif TGACG.We have discovered that one of these transcription factors, TGA2, behaves as arepressor in unchallenged Arabidopsis and acts to repress NPRI-dependent activation ofPRJ. TGA1, which bears moderate sequence similarity to TGA2, acts as a transcriptionalactivator in unchallenged Arabidopsis, however the significance of this activity isJunclear. Once SAR has been induced, TGAI and TGA2 interact with NPRI to formcomplexes that are capable of activating transcription. Curiously, although TGAI iscapable of transactivating, the ability of the TGAI-NPRI complex to activatetranscription results from a novel transactivation domain in NPRI. This transactivationdomain, which depends on the oxidation of cysteines 521 and 529, is also responsible forthe transactivation ability of the TGA2-NPRI complex. Although the exact mechanism preventing TGA2-NPRI interaction inunchallenged Arabidopsis is unclear, the regulation of TGAI-NPRI interaction is basedon the redox status of cysteines 260 and 266 in TGAl. We determined that aglutaredoxin, which is an enzyme capable of regulating a protein's redox status, interactswith the reduced form of TGAI and this interaction results .in the glutathionylation ofTGAI and a loss of interaction with NPRl.Taken together, these results expand our understanding of how TGA transcriptionfactors and NPRI behave to regulate events and gene expression during SAR.Furthermore, the regulation of the behavior of both TGAI and NPRI by their redoxstatus and the involvement of a glutaredoxin in modulating TGAI-NPRI interactionsuggests the redox regulation of proteins is a general mechanism implemented in SAR." @default.
- W2261214933 created "2016-06-24" @default.
- W2261214933 creator A5051212846 @default.
- W2261214933 date "2012-07-31" @default.
- W2261214933 modified "2023-09-24" @default.
- W2261214933 title "Regulation of Systemic Acquired Resistance through the Interaction of Arabidopsis thaliana Transcription factors TGAI and TGA2 with NPRI" @default.
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