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Isolation and Functional Characterization of New Terpene Synthase Genes from Traditional Edible Plants. | LitMetric

AI Article Synopsis

Article Abstract

Terpene synthase (TPS) genes were isolated and functionally characterized from three traditional edible plants, Acanthopanax sciadophylloides ("Koshiabura") and Acanthopanax sieboldianus ("Himeukogi"), belonging to the family Araliaceae, and Curcuma zedoaria (zedoary, "Gajutsu"), belonging to the family Zingiberaceae. These plants emit characteristic fragrances and are used for traditional foods and folk medicines. From their fragrant tissues, i.e., sprouts of Araliaceae plants and developing rhizomes of zedoary, total RNAs were extracted and reverse transcribed. The resultant cDNAs were used for degenerate PCR followed by rapid amplification of cDNA ends. From the contig sequences obtained, full-length Tps genes were amplified by PCR with newly synthesized primer sets. The isolated full-length genes were introduced into engineered Escherichia coli cells, which can utilize acetoacetate to synthesize farnesyl diphosphate, the substrate for TPSs, through the mevalonate pathway. TPS products synthesized in the transformed E. coli cells were analysed by gas chromatography-mass spectrometry, nuclear magnetic resonance, and optical rotation. Consequently, the isolated Tps genes were found to encode β-caryophyllene synthase, germacrene D synthase, linalool/(3S)-(+)-nerolidol synthase, β-eudesmol synthase, and germacrene B synthase. These results lead us to expect that some of the effective ingredients in folk medicines are volatile terpenes and that intake of traditional foods including these edible plants would have some positive effects on our health.

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http://dx.doi.org/10.5650/jos.ess18163DOI Listing

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