Research article summary (published 17 Jun 2009):

The plastidic bile acid transporter 5 is required for the biosynthesis of methionine-derived glucosinolates in Arabidopsis thaliana.

Full Abstract

Aliphatic glucosinolate biosynthesis is highly compartmentalized, requiring import of 2-keto acids or amino acids into chloroplasts for side chain elongation and export of the resulting compounds into the cytosol for conversion into glucosinolate. Aliphatic glucosinolate biosynthesis in Arabidopsis thaliana is regulated by three R2R3-MYB transcription factors, the major player being High Aliphatic Glucosinolate 1 (HAG1/MYB28). Here, we show that BAT5, which belongs to the putative bile acid transporter family, is the only member of this family that is transactivated by HAG1/MYB28, HAG2/MYB76, and HAG3/MYB29. Furthermore, two isopropylmalate isomerases genes, IPMI1 and IPMI2, and the isopropylmalate dehydrogenase gene, IPMDH1, were identified as targets of HAG1/MYB28 and the corresponding proteins localized to plastids, suggesting a role in plastidic chain elongation reactions. The BAT proteins also localized to plastids; however, only mutants defective in BAT5 function contained strongly reduced levels of aliphatic glucosinolates. The bat5 mutant chemotype was rescued by induced overexpression of BAT5. Feeding experiments using 2-keto acids and amino acids of different chain length suggest that BAT5 is a plastidic transporter of (chain-elongated) 2-keto acids. Mechanical stimuli and methyl jasmonate transiently induced BAT5 expression in inflorescences and leaves. Thus, BAT5 was identified as the first transporter component of the aliphatic glucosinolate biosynthetic pathway.

Author information

Author/s: Gigolashvili, Tamara (T); Yatusevich, Ruslan (R); Rollwitz, Inga (I); Humphry, Melanie (M); Gershenzon, Jonathan (J); Flügge, Ulf-Ingo (UI);

Affiliation: Botanisches Institut der Universität zu Köln, D-50931 Köln, Germany.

Journal and publication information

Publication Type: Journal Article; Research Support, Non-U.S. Gov't

Journal: The Plant cell (Plant Cell), published in United States. (Language: eng)

Reference: 2009-Jun; vol 21 (issue 6) : pp 1813-29

Dates: Created 2009/08/06; Completed 2009/10/22;

PMID: 19542295, status: MEDLINE (last retrieval date: 10/22/2009, IMS Date: )

Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.

Comments and Corrections

CommentIn: Plant Cell. 2009 Jun;21(6):1622. (PMID: 19531598)

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MeSH headings (categories)

This article was linked to the MESH Headings shown below.

Acetic Acids - pharmacology Arabidopsis - drug effects; genetics; metabolism Arabidopsis Proteins - genetics; metabolism; physiology Chloroplasts - metabolism Cyclopentanes - pharmacology Cytosol - metabolism Flowers - drug effects; genetics; metabolism Gene Expression Regulation, Plant - drug effects Glucosinolates - biosynthesis

Glucosinolates - biosynthesis Keto Acids - metabolism Organic Anion Transporters, Sodium-Dependent - genetics; metabolism; physiology Oxylipins - pharmacology Phylogeny Plant Leaves - drug effects; genetics; metabolism Plastids - metabolism Transcription Factors - metabolism Transcriptional Activation

Associated Chemicals: Acetic Acids (0) ; Arabidopsis Proteins (0) ; BAT5 protein, Arabidopsis (0) ; Cyclopentanes (0) ; Glucosinolates (0) ; Keto Acids (0) ; MYB28 protein, Arabidopsis (0) ; Organic Anion Transporters, Sodium-Dependent (0) ; Oxylipins (0) ; Transcription Factors (0) ; methyl jasmonate (1211-29-6)

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