Abstract
Ixeris dentata form.albiflora Hara, a perennial medicinal herb, accumulates various sesquiterpenes whose first committed step in biosynthesis is the cyclization of farnesyl diphosphate by terpene synthase. To isolate the synthase geneldGAS, we amplified a 184-bp DNA fragment of sesquiterpene synthase gene fromI. dentata genomic DNA, using a homology-based PCR technique. Sequence information derived from the rapid amplification of cDNA ends was used to produce a 1956-bp full-length cDNA sequence. This included a 1755-b open reading frame for 584 amino acids, with a deduced size of 67.1 kDa and a pi of 5.16. The partially purified recombinant synthase had an optimum temperature and pH at 37°C and 7.5 to 8.0, respectively, as well as aK m of 11.0 and 14.9 mM at 25 and 37°C, respectively. The expressed protein was inactive with geranyl diphosphate, but did catalyze the cyclization of farnesyl diphosphate to produce a sesquiterpene that was then identified through GC-MS and NMR analyses as (+)-germacrene A. When 44 residues were deleted from its N-terminal, the mutant lost 90% of its activity, suggesting that additional residues are necessary for full enzymatic activity. Transcript levels were comparable between roots and leaves, but began to decline in leaves near the onset of flowering.
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Abbreviations
- FDP:
-
farnesyl diphosphate
- IdGAS:
-
germacrene A synthase of Ixeris dentata
- gISC:
-
genomic sequence of Ixeris sesquiterpene cyclase
- RACE:
-
rapid amplification of cDNA ends
Literature Cited
Ahn JC, Kim SH, Kim MY, Kim OT, Kim KS, Hwang B (2003) Seasonal variations in yields of hwangchil lacquer and major sesquiterpene compounds from selected superior individuals ofDendropanax morbifera Lev. J Plant Biol 46: 38–40
Back K, Chappell J (1995) Cloning and bacterial expression of a sesquiterpene cyclase fromHyoscyamus muticus and its molecular comparison to related terpene cyclases. J Biol Chem 270: 7375–7381
Bennett MH, Mansfield JW, Lewis MJ, Beale MH (2002) Cloning and expression of sesquiterpene synthase genes from lettuce (Lactuca sativa L). Phytochem 60: 255–261
Bishop GA, Rokahr KL, Lowes M, McGuinness PH, Napoli J, DeCruz DJ, Wong WY, McCaughan GW (1997) Quantitative reverse transcriptase-PCR amplification of cytokine mRNA in liver biopsy specimens using a noncompetitive method. Immunol Cell Biol 75: 142–147
Bohlmann J, Crock J, Jetter R, Croteau R (1998) Terpenoid-based defenses in conifers: cDNA cloning, characterization, and functional expression of wound-inducible (E)-ot-bisabolene synthase from grand fir (Abies grandis). Proc Natl Acad Sci USA 95: 6756–6761
Bouwmeester HJ, Kodde J, Verstappen FW, Altug IG, de Kraker JW, Wallaart TE (2002) Isolation and characterization of two germacrene A synthase cDNA clones from chicory. Plant Physiol 129: 134–144
Chang YJ, Jin J, Nam HY, Kim SU (2005) Point mutation of (+)-germacrene A synthase fromIxeris dentata. Biotechnol Lett 27: 285–288
Chang YJ, Song SH, Park SH, Kim SU (2000) Amorpha-4, 11-diene synthase ofArtemisia annua: cDNA isolation and bacterial expression of a terpene synthase involved in artemisinin biosynthesis. Arch Biochem Bio-phys 383: 178–184
Chen XY, Chen Y, Heinstein P, Davisson VJ (1995) Cloning, expression, and characterization of (+)-8-cadinene synthase: A catalyst for cotton phytoalexin biosynthesis. Arch Biochem Biophys 324: 255–266
Chung HS, Woo WS, Lim SJ (1994) Dentalactone, a sesquiterpene fromIxeris dentata. Phytochem 35: 1583–1584
Colby SM, Crock J, Dowdle-Rizzo B, Lemaux PG, Croteau R (1998) Germacrene C synthase fromLycopersicon esculentum cv VFNT cherry tomato: cDNA isolation, characterization, and bacterial expression of the multiple product sesquiterpene cyclase. Proc Natl Acad Sci USA 95: 2216–2221
Crock J, Wildung MR, Croteau R (1997) Isolation and bacterial expression of a sesquiterpene synthase cDNA clone from peppermint (Mentha x piperita L) that produces the aphid alarm pheromone (E)-β-farnesene. Proc Natl Acad Sci USA 94: 12833–12838
de Kraker J-W, Fransen MCR, Dalm MCF, de Groot A, Bouwmeester HJ (2001) Biosynthesis of germacrene A carboxylic acid in chicory roots: Demonstration of a cytochrome P450 (+)-germacrene A hydroxylase and NADP+-dependent sesquiterpenoid dehydrogenase(s) involved in sesquiterpene lactone biosynthesis. Plant Physiol 125: 1930–1940
de Kraker J-W, Franssen MCR, de Groot A, Konig WA, Bouwmeester HJ (1998) (+)-Germacrene A biosynthesis: The committed step in the biosynthesis of bitter sesquiterpene lactones in chicory. Plant Physiol 117: 1381–1392
de Kraker J-W, Fransen MCR, Joerink M, de Groot A, Bouwmeester HJ (2002) Biosynthesis of costunolide, dihy-drocostunolide, and leucodin: Demonstration of cytochrome P450-catalyzed formation of the lactone ring present in sesquiterpene lactones of chicory. Plant Physiol 129: 257–268
Acchini PJ, Chappell J (1992) Gene family for an elicitor-induced sesquiterpene cyclase in tobacco. Proc Natl Acad Sci USA 89: 11088–11092
Harbone JB (1999) Plant chemical ecology,In D Barton, K Nakanish, eds, Comprehensive Natural Products Chemistry, Vol 8. Pergamon Press, Amsterdam, pp 137–196
Lee JR, Yang MS, Jang DS, Ha TJ, Park KM, Lee CH, Kho YH, Park KH (2001) A new guaianolide as apoptosis inhibitor fromChrysanthemum boreale. Planta Med 67: 585–587
Ma JY, Wang ZT, Xu LS, Xu GJ (1999) A sesquiterpene lactone glucoside fromIxeris denticulata f. pinnatipartita. Phytochem 50: 113–115
Mercke R Crock J, Croteau R, Brodelius PE (1999) Cloning, expression, and characterization of epi-cedrol synthase, a sesquiterpene cyclase fromArtemisia annua L. Arch Biochem Biophys 369: 213–222
Munck SL, Croteau R (1990) Purification and characterization of the sesquiterpene cyclase patchoulol synthase fromPosgostemon cablin. Arch Biochem Biophys 282: 58–64
Prosser I, Phillips AL, Gittings S, Lewis MJ, Hooper AM, Pickett JA, Beale MH (2002) (+)-(10R)-Germacrene A synthase from goldenrod,Solidago canadensis; cDNA isolation, bacterial expression and functional analysis. Phytochem 60: 691–702
Schultz TH, Flath RA, Mon R, Eggling SB, Teranish R (1977) Isolation of volatile components from a model system. J Agric Food Chem 25: 446–449
Seto M, Miyase T, Fukushima S (1986) Sesquiterpene lactones fromIxeris dentata Nakai. Chem Pharm Bull 34: 4170–4176
Starks CM, Back K, Chappell J, Noel JP (1997) Structural basis for cyclic terpene biosynthesis by tobacco 5-epi-aristolochene synthase. Science 277: 1815–1820
Steele CL, Crock J, Bohlmann J, Croteau R (1998) Sesquiterpene synthases from grand fir (Abies grandis): Comparison of constitutive and wound-induced activities, and cDNA isolation, characterization, and bacterial expression of 8-selinene synthase and y-humulene synthase. J Biol Chem 273: 2078–2089
Weinheimer AJ, Youngblood WW, Washecheck PH, Karns TKB, Ciereszko LS (1970) Isolation of the elusive (-)-ger-macrene-A from the gorgonianEunicea mammosa. Tetrahedron Lett 7: 497–500
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Kim, MY., Chang, YJ., Bang, MH. et al. cDNA isolation and characterization of (+)-germacrene a synthase fromIxerls dentata form.albiflora Hara. J. Plant Biol. 48, 178–186 (2005). https://doi.org/10.1007/BF03030406
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DOI: https://doi.org/10.1007/BF03030406