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Expression of the Arabidopsis redox-related LEA protein, SAG21 is regulated by ERF, NAC and WRKY transcription factors

Evans, Kelly V., Ransom, Elspeth, Nayakoti, Swapna, Wilding, Ben, Salleh, Faezah Mohd, Gržina, Irena, Erber, Lieselotte, Tse, Carmen, Hill, Claire, Polanski, Krzysztof, Holland, Alistair, Bukhat, Sherien, Herbert, Robert J., de Graaf, Barend H. J. ORCID:, Denby, Katherine, Buchanan-Wollaston, Vicky and Rogers, Hilary J. ORCID: 2024. Expression of the Arabidopsis redox-related LEA protein, SAG21 is regulated by ERF, NAC and WRKY transcription factors. Scientific Reports 14 , 7756. 10.1038/s41598-024-58161-0

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SAG21/LEA5 is an unusual late embryogenesis abundant protein in Arabidopsis thaliana, that is primarily mitochondrially located and may be important in regulating translation in both chloroplasts and mitochondria. SAG21 expression is regulated by a plethora of abiotic and biotic stresses and plant growth regulators indicating a complex regulatory network. To identify key transcription factors regulating SAG21 expression, yeast-1-hybrid screens were used to identify transcription factors that bind the 1685 bp upstream of the SAG21 translational start site. Thirty-three transcription factors from nine different families bound to the SAG21 promoter, including members of the ERF, WRKY and NAC families. Key binding sites for both NAC and WRKY transcription factors were tested through site directed mutagenesis indicating the presence of cryptic binding sites for both these transcription factor families. Co-expression in protoplasts confirmed the activation of SAG21 by WRKY63/ABO3, and SAG21 upregulation elicited by oligogalacturonide elicitors was partially dependent on WRKY63, indicating its role in SAG21 pathogen responses. SAG21 upregulation by ethylene was abolished in the erf1 mutant, while wound-induced SAG21 expression was abolished in anac71 mutants, indicating SAG21 expression can be regulated by several distinct transcription factors depending on the stress condition.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Publisher: Nature Research
ISSN: 2045-2322
Date of First Compliant Deposit: 27 March 2024
Date of Acceptance: 26 March 2024
Last Modified: 02 Apr 2024 13:15

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