期刊
JOURNAL OF NATURAL PRODUCTS
卷 78, 期 6, 页码 1231-1242出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jnatprod.5b00023
关键词
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资金
- Chemical Sciences, Geosciences and Biosciences Division, DOE Office of Basic Energy Sciences [DE-FG-0397ER20259]
- National Science Foundation [MCB-1052557, DBI-1229749]
- G. Thomas and Anita Hargrove Center for Plant Genomic Research
- Office of Science of the U. S. Department of Energy [DE-AC02-05CH11231]
- Div Of Molecular and Cellular Bioscience
- Direct For Biological Sciences [1052557] Funding Source: National Science Foundation
An integrated omics approach using genomics, transcriptomics, metabolomics (MALDI mass spectrometry imaging, MSI), and bioinformatics was employed to study spatiotemporal formation and deposition of health-protecting polymeric lignans and plant defense cyanogenic glucosides. Intact flax (Linum usitatissimum) capsules and seed tissues at different development stages were analyzed. Transcriptome analyses indicated distinct expression patterns of dirigent protein (DP) gene family members encoding (-)- and (+)-pinoresinol-forming DPs and their associated downstream metabolic processes, respectively, with the former expressed at early seed coat development stages. Genes encoding (+)-pinoresinol-forming DPs were, in contrast, expressed at later development stages. Recombinant DP expression and DP assays also unequivocally established their distinct stereoselective biochemical functions. Using MALDI MSI and ion mobility separation analyses, the pinoresinol downstream derivatives, secoisolariciresinol diglucoside (SDG) and SDG hydroxymethylglutaryl ester, were localized and detectable only in early seed coat development stages. SDG derivatives were then converted into higher molecular weight phenolics during seed coat maturation. By contrast, the plant defense cyanogenic glucosides, the monoglucosides linamarin/lotaustralin, were detected throughout the flax capsule, whereas diglucosides linustatin/neolinustatin only accumulated in endosperm and embryo tissues. A putative biosynthetic pathway to the cyanogens is proposed on the basis of transcriptome coexpression data. Localization of all metabolites was at ca. 20 mu m resolution, with the web based tool OpenMSI enabling not only resolution enhancement but also an interactive system for real-time searching for any ion in the tissue under analysis.
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