| Metabolic profiling and cytological analysis of proanthocyanidins in immature seeds of Arabidopsis thaliana flavonoid accumulation mutants. | |
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MedLine Citation:
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PMID: 20180920 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Arabidopsis TRANSPARENT TESTA19 (TT19) encodes a glutathione-S-transferase (GST)-like protein that is involved in the accumulation of proanthocyanidins (PAs) in the seed coat. PA accumulation sites in tt19 immature seeds were observed as small vacuolar-like structures, whereas those in tt12, a mutant of the tonoplast-bound transporter of PAs, and tt12 tt19 were observed at peripheral regions of small vacuoles. We found that tt19 immature seeds had small spherical structures showing unique thick morphology by differential interference contrast microscopy. The distribution pattern of the thick structures overlapped the location of PA accumulation sites, and the thick structures were outlined with GFP-TT12 proteins in tt19. PA analysis showed higher (eightfold) levels of solvent-insoluble PAs in tt19 immature seeds compared with the wild type. Metabolic profiling of the solvent-soluble fraction by LC-MS demonstrated that PA derivatives such as epicatechins and epicatechin oligomers, although highly accumulated in the wild type, were absent in tt19. We also revealed that tt12 specifically accumulated glycosylated epicatechins, the putative transport substrates for TT12. tt12 tt19 showed a similar metabolic profile to tt19. Given the cytosolic localization of functional GFP-TT19 proteins, our results suggest that TT19, which acts prior to TT12, functions in the cytosol to maintain the regular accumulation of PA precursors, such as epicatechin and glycosylated epicatechin, in the vacuole. The PA pathway in the Arabidopsis seed coat is discussed in relation to the subcellular localization of PA metabolites. |
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Authors:
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Satoshi Kitamura; Fumio Matsuda; Takayuki Tohge; Keiko Yonekura-Sakakibara; Mami Yamazaki; Kazuki Saito; Issay Narumi |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2010-02-18 |
Journal Detail:
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Title: The Plant journal : for cell and molecular biology Volume: 62 ISSN: 1365-313X ISO Abbreviation: Plant J. Publication Date: 2010 May |
Date Detail:
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Created Date: 2010-06-11 Completed Date: 2010-08-30 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9207397 Medline TA: Plant J Country: England |
Other Details:
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Languages: eng Pagination: 549-59 Citation Subset: IM |
Affiliation:
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Gene Resource Research Group, Radiation-Applied Biology Division, Japan Atomic Energy Agency (JAEA), 1233 Watanuki, Takasaki 370-1292, Japan. kitamura.satoshi@jaea.go.jp |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Arabidopsis
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genetics*,
metabolism Arabidopsis Proteins / genetics, metabolism* Catechin / analysis Glutathione Transferase / genetics, metabolism* Metabolome Mutation Proanthocyanidins / analysis* Seeds / metabolism* Transcription Factors / genetics, metabolism |
| Chemical | |
Reg. No./Substance:
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0/Arabidopsis Proteins; 0/Proanthocyanidins; 0/Transcription Factors; 0/tt12 protein, Arabidopsis; 154-23-4/Catechin; EC 2.5.1.18/Glutathione Transferase; EC 2.5.1.18/TRANSPARENT TESTA 19 protein, Arabidopsis |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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