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Functional metabolomics as a tool to analyze Mediator function and structure in plants
Umeå University, Faculty of Medicine, Department of Medical Biochemistry and Biophysics.
Umeå University, Faculty of Medicine, Department of Medical Biochemistry and Biophysics.
Umeå University, Faculty of Medicine, Department of Medical Biochemistry and Biophysics.
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2017 (English)In: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 12, no 6, article id e0179640Article in journal (Refereed) Published
Abstract [en]

Mediator is a multiprotein transcriptional co-regulator complex composed of four modules; Head, Middle, Tail, and Kinase. It conveys signals from promoter-bound transcriptional regulators to RNA polymerase II and thus plays an essential role in eukaryotic gene regulation. We describe subunit localization and activities of Mediator in Arabidopsis through metabolome and transcriptome analyses from a set of Mediator mutants. Functional metabolomic analysis based on the metabolite profiles of Mediator mutants using multivariate statistical analysis and heat-map visualization shows that different subunit mutants display distinct metabolite profiles, which cluster according to the reported localization of the corresponding subunits in yeast. Based on these results, we suggest localization of previously unassigned plant Mediator subunits to specific modules. We also describe novel roles for individual subunits in development, and demonstrate changes in gene expression patterns and specific metabolite levels in med18 and med25, which can explain their phenotypes. We find that med18 displays levels of phytoalexins normally found in wild type plants only after exposure to pathogens. Our results indicate that different Mediator subunits are involved in specific signaling pathways that control developmental processes and tolerance to pathogen infections.

Place, publisher, year, edition, pages
Public Library Science , 2017. Vol. 12, no 6, article id e0179640
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Developmental Biology Genetics
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URN: urn:nbn:se:umu:diva-140237DOI: 10.1371/journal.pone.0179640ISI: 000404135800047PubMedID: 28640868OAI: oai:DiVA.org:umu-140237DiVA, id: diva2:1150743
Available from: 2017-10-19 Created: 2017-10-19 Last updated: 2018-06-09Bibliographically approved

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Davoine, CelineKhajeh, KhalilBlomberg, JeanetteBjörklund, Stefan
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