Abstract
Mountain pepper (Litsea cubeba (Lour.) Persoon) is an evergreen tree in the Lauraceae family and has attracted attention for the antioxidant and antibacterial effects of its essential oils. The dominant components of the essential oil of L. cubeba are monoterpenes. To investigate the biosynthesis of monoterpenes that have bioactivity in L. cubeba, three cDNAs corresponding to monoterpene synthase genes were isolated, and the corresponding enzymes were functionally characterized in vitro. The genes obtained were named LcTPS1, LcTPS2, and LcTPS3. Transcript levels for LcTPS1 were most prominent in the leaf tissues, and levels of LcTPS2 and LcTPS3 were more evident in fruit tissues than in leaf tissues. Phylogenetic analyses indicated that LcTPS1, LcTPS2, and LcTPS3 all belong to TPS-b subfamily of angiosperm monoterpene synthases. For each genes, the corresponding enzymes were expressed and functionally characterized. LcTPS1 converted geranyl diphosphate to trans-ocimene, and LcTPS2 converted geranyl diphosphate to α-thujene, while LcTPS3 is a mutifunctional enzyme that converted geranyl diphosphate to α-thujene and (+)-sabinene, respectively.
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Abbreviations
- mono-TPS:
-
Monoterpene synthase
- TPS:
-
Terpene synthase
References
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Acknowledgments
The authors are grateful for expert technical assistance from Yi-Ru Lee and the Huisun Experimental Forest of the National Chung Hsing University for providing various organ samples of L. cubeba. Financial assistance from the Council of Agriculture Executive Yuan is gratefully acknowledged.
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Communicated by R. Sederoff
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Figure 1
Homology models for LcTPS1. The models were constructed using SWISS protein structure prediction server by threading LcTPS1 sequences into the coordinate of (4S)-limonene synthase (PDB code: 2ongB) three-dimensional structure. a Homology model for LcTPS1 that colored by secondary structure succession from N-terminal to C-terminal domain. b Homology model for LcTPS1 which the DDxxD motif (green), the NSE/DTE motif (blue), and the H-α1 loop region (purple) with their associated bound magnesium atoms (white tri-atom cluster) and the diphosphate moiety of 2-fluoro GPP (analogous of GPP) which is shown in sticks are also indicated. (DOC 513 kb)
Figure 2
Amino acids alignment showing the topological positioning of the H-α1 loop in nine TPS-d enzymes and the three TPS-b enzymes from L. cubeba. The nine TPS-d sequences were selected on the basis that they account for all possible variations of amino acids in the H-α1 loop of 24 TPS-d protein sequences. Aa linalool, Artemisia annua linalool synthase (AAF13356); Aa pinene, Artemisia annua ß -pinene synthase (AAK58723); At myrcene, Arabidopsis thaliana putative limonene cyclase (AAD03382); At limonene, Arabidopsis thalian limonene cyclase (BAB01181); Cu pinene, Citrus unshiu ß-pinene synthase (BAD27260); La bergamotene, Lavandula angustifolia trans-α-bergamotene synthase (ABB73046); La limonene, Lavandula angustifolia limonene synthase (ABB73044); Ma linalool Mentha aquati linalool synthase (AAL99381); Ob myrcene, Ocimum basilicum ß-myrcene synthase (AAV63791); Pml isoprene, Pueraria montana var. lobata isoprene synthase (AAQ84170); Pn isoprene, Populus nigra isoprene synthase (CAL69918); Qi myrcene, Quercus ilex putative chloroplast terpene synthase (CAC41012); Sf cineole Salvia fruticosa cineole synthase (ABH07677); So bornyl, Salvia officinalis (+)-bornyl diphosphate synthase (AAC26017). (DOC 320 kb)
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Chang, YT., Chu, FH. Molecular cloning and characterization of monoterpene synthases from Litsea cubeba (Lour.) Persoon. Tree Genetics & Genomes 7, 835–844 (2011). https://doi.org/10.1007/s11295-011-0377-3
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DOI: https://doi.org/10.1007/s11295-011-0377-3