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Mediator subunits MED16, MED14, and MED2 are required for activation of ABRE-dependent transcription in Arabidopsis
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Lee, Morgan, Dominguez-Ferreras, Anna, Kaliyadasa, Ewon, Huang, Wei-Jie, Antony, Edna, Stevenson, Tracey, Lehmann, Silke, Schäfer, Patrick, Knight, Marc R., Ntoukakis, Vardis and Knight, Heather (2021) Mediator subunits MED16, MED14, and MED2 are required for activation of ABRE-dependent transcription in Arabidopsis. Frontiers in Plant Science, 12 . 649720. doi:10.3389/fpls.2021.649720
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WRAP-mediator-subunits-MED16-MED14-MED2-required-activation-ABRE-dependent-transcription-Arabidopsis-2021.pdf - Published Version - Requires a PDF viewer. Available under License Creative Commons Attribution 4.0. Download (2648Kb) | Preview |
Official URL: http://dx.doi.org/10.3389/fpls.2021.649720
Abstract
The Mediator complex controls transcription of most eukaryotic genes with individual subunits required for the control of particular gene regulons in response to various perturbations. In this study, we reveal the roles of the plant Mediator subunits MED16, MED14, and MED2 in regulating transcription in response to the phytohormone abscisic acid (ABA) and we determine which cis elements are under their control. Using synthetic promoter reporters we established an effective system for testing relationships between subunits and specific cis-acting motifs in protoplasts. Our results demonstrate that MED16, MED14, and MED2 are required for the full transcriptional activation by ABA of promoters containing both the ABRE (ABA-responsive element) and DRE (drought-responsive element). Using synthetic promoter motif concatamers, we showed that ABA-responsive activation of the ABRE but not the DRE motif was dependent on these three Mediator subunits. Furthermore, the three subunits were required for the control of water loss from leaves but played no role in ABA-dependent growth inhibition, highlighting specificity in their functions. Our results identify new roles for three Mediator subunits, provide a direct demonstration of their function and highlight that our experimental approach can be utilized to identify the function of subunits of plant transcriptional regulators.
| Item Type: | Journal Article | |||||||||||||||||||||
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| Subjects: | Q Science > QH Natural history Q Science > QK Botany |
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| Divisions: | Faculty of Science > Life Sciences (2010- ) | |||||||||||||||||||||
| Library of Congress Subject Headings (LCSH): | Arabidopsis , Eukaryotic cells , Plant hormones -- Synthesis, Plant protoplasts | |||||||||||||||||||||
| Journal or Publication Title: | Frontiers in Plant Science | |||||||||||||||||||||
| Publisher: | Frontiers Media S.A. | |||||||||||||||||||||
| ISSN: | 1664-462X | |||||||||||||||||||||
| Official Date: | 11 March 2021 | |||||||||||||||||||||
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| Volume: | 12 | |||||||||||||||||||||
| Article Number: | 649720 | |||||||||||||||||||||
| DOI: | 10.3389/fpls.2021.649720 | |||||||||||||||||||||
| Status: | Peer Reviewed | |||||||||||||||||||||
| Publication Status: | Published | |||||||||||||||||||||
| Access rights to Published version: | Open Access | |||||||||||||||||||||
| RIOXX Funder/Project Grant: |
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