SAD2, an Importin -Like Protein, Is Required for UV-B Response in Arabidopsis by Mediating MYB4 Nuclear Trafficking.

SAD2, an Importin -Like Protein, Is Required for UV-B Response in Arabidopsis by Mediating MYB4 Nuclear Trafficking. Research Abstract Details 

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SAD2, an Importin -Like Protein, Is Required for UV-B Response in Arabidopsis by Mediating MYB4 Nuclear Trafficking. Abstract Text:

Jinfeng Zhao,Wenhui Zhang,Yang Zhao,Ximing Gong,Lei Guo,Guoli Zhu,Xuechen Wang,Zhizhong Gong,Karen S Schumaker,Yan Guo,Jinfeng Zhao,Wenhui Zhang,Yang Zhao,Ximing Gong,Lei Guo,Guoli Zhu,Xuechen Wang,Zhizhong Gong,Karen S Schumaker,Yan Guo,

We report that the Arabidopsis thaliana mutant sensitive to ABA and drought2 (sad2), which harbors a T-DNA insertion in an importin beta-like gene, is more tolerant to UV-B radiation than the wild type. Analysis of cyclobutane pyrimidine dimer accumulation revealed that less DNA damage occurred in sad2 than in the wild type during UV-B treatment. No significant growth difference was observed between sad2 and the wild type when treated with the genotoxic drug methyl methanesulfonate, suggesting that SAD2 functions in UV-B protection rather than in DNA damage repair. Whereas the R2R3-type transcription repressor MYB4 has previously been shown to negatively regulate the transcription of cinnamate 4-hydroxylase (C4H) and thus to regulate the synthesis of sinapate esters, expression of both MYB4 and C4H and accumulation of UV-absorbing compounds were significantly higher in sad2 than in the wild type. MYB4 did not localize to the nucleus in the sad2 mutant, suggesting that SAD2 is required for MYB4 nuclear trafficking. SAD2 and MYB4 coimmunoprecipitated, indicating that these proteins localize in the same complex in vivo. MYB4 protein specifically bound to its own promoter in gel shift assays and repressed its own expression, demonstrating that MYB4 protein and mRNA are part of a negative autoregulatory loop. This feedback loop is altered in the sad2 mutant due to the absence of MYB4 protein in the nucleus, leading to the constitutive expression of MYB4 and C4H and resulting in accumulation of UV-absorbing pigments that shield the plant from UV-B radiation.

SAD2, an Importin -Like Protein, Is Required for UV-B Response in Arabidopsis by Mediating MYB4 Nuclear Trafficking. Publishing Authors By Initials

J Zhao,W Zhang,Y Zhao,X Gong,L Guo,G Zhu,X Wang,Z Gong,KS Schumaker,Y Guo,J Zhao,W Zhang,Y Zhao,X Gong,L Guo,G Zhu,X Wang,Z Gong,KS Schumaker,Y Guo,

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SAD2, an Importin -Like Protein, Is Required for UV-B Response in Arabidopsis by Mediating MYB4 Nuclear Trafficking. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: The Plant cell

VOLUME: 19

Page Numbers: 3805-18

Journal Abbreviation: Plant Cell

ISSN: 1040-4651

DAY: 9

MONTH: 11

YEAR: 2007

SAD2, an Importin -Like Protein, Is Required for UV-B Response in Arabidopsis by Mediating MYB4 Nuclear Trafficking. Information

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LANGUAGE: eng

NlmUniqueID: 9208688

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Grant and Affiliation Information for SAD2, an Importin -Like Protein, Is Required for UV-B Response in Arabidopsis by Mediating MYB4 Nuclear Trafficking.

AFFILIATION: State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University, Beijing 100094, China.

Country: United States

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MEDLINETA: Plant Cell

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