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The viral suppressor HCPro decreases DNA methylation and activates auxin biosynthesis genes.

Virology. 2020 Jul;546:133-140. Epub 2020 May 04
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摘要


Auxin has profound effects on plant growth and development. In addition to participating in plant growth and development, the auxin signaling pathway is involved in plant defense against pathogens. In this study, we investigated the molecular mechanism by which helper-component protease (HCPro) encoded by the Tobacco vein banding mosaic virus (TVBMV) activates auxin biosynthesis genes (YUCs) and interferes with the auxin signaling pathway. Our results demonstrated that the viral suppressor HCPro decreased the DNA methylation of dispersed repeats (DRs) within the promoters of YUC1, YUC5 and YUC10 and transcriptional activated these YUC genes targeted by RNA-directed DNA methylation (RdDM), leading to an increase in auxin accumulation in plants. Furthermore, we found that the induction of these YUCs by HCPro was attenuated in ros1 mutant plants, suggesting that HCPro-mediated transcriptional activation of the genes was partly dependent on DNA demethylation.

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