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Volumn 6, Issue 10, 2015, Pages 5740-5745

Biosynthetic insights provided by unusual sesterterpenes from the medicinal herb Aletris farinosa

Author keywords

[No Author keywords available]

Indexed keywords

BIOCHEMISTRY; BIOSYNTHESIS; CARBON; COMPUTATION THEORY; CRYSTALLOGRAPHY; DENSITY FUNCTIONAL THEORY;

EID: 84941641536     PISSN: 20416520     EISSN: 20416539     Source Type: Journal    
DOI: 10.1039/c5sc02056e     Document Type: Article
Times cited : (11)

References (29)
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    • The biosynthetic origins of diterpenes can be complex. Class I terpene cyclases catalyse the formation of a reactive cationic intermediate via pyrophosphate ionization as is typical of mono- and sesquiterpene biosynthesis. Class II diterpene synthases use protonation of an alkene to initiate cyclisation. Some enzymes combine both these functions, with pyrophosphate ionization followed by a protonation step or vice versa. For reviews see
    • J. Shinozaki M. Shibuya Y. Ebizuka K. Masuda Biosci., Biotechnol., Biochem. 2013 77 2278 2282
    • (2013) Biosci., Biotechnol., Biochem. , vol.77 , pp. 2278-2282
    • Shinozaki, J.1    Shibuya, M.2    Ebizuka, Y.3    Masuda, K.4
  • 5
    • 0000502773 scopus 로고    scopus 로고
    • in, ed. D. E. Cane, Elsevier Science, Oxford, ch. 2.08, Enzyme-induced conformational control of the fates of cationic intermediates in terpene biosynthesis has recently been proposed by Tantillo in his seminal studies of the bisabolyl cation: see
    • J. MacMillan and M. H. Beale, in Comprehensive Natural Products Chemistry, ed., D. E. Cane, Elsevier Science, Oxford, 1999, vol. 2, ch. 2.08, pp. 217-243
    • (1999) Comprehensive Natural Products Chemistry , vol.2 , pp. 217-243
    • MacMillan, J.1    Beale, M.H.2
  • 7
    • 84924942301 scopus 로고    scopus 로고
    • For the role of post-TS dynamic effects in determining product selectivities, see
    • R. P. Pemberton K. C. Ho D. J. Tantillo Chem. Sci. 2015 6 2347 2353
    • (2015) Chem. Sci. , vol.6 , pp. 2347-2353
    • Pemberton, R.P.1    Ho, K.C.2    Tantillo, D.J.3
  • 16
    • 84941723329 scopus 로고    scopus 로고
    • Jpn. Kokai Tokkyo Koho JP 2012206962) albeit with differing, apparently erroneous stereochemistry of the Δ17(18) double bond 8 PCM
    • H. Takikawa and M. Sugiyama, Jpn. Kokai Tokkyo Koho JP 2012206962, 2012
    • (2012)
    • Takikawa, H.1    Sugiyama, M.2
  • 23
    • 77956630251 scopus 로고    scopus 로고
    • ESI This has also been suggested in the case of the sesterterpene ophiobolin F
    • S. G. Smith J. M. Goodman J. Am. Chem. Soc. 2010 132 12946 12959
    • (2010) J. Am. Chem. Soc. , vol.132 , pp. 12946-12959
    • Smith, S.G.1    Goodman, J.M.2
  • 26
    • 0034683034 scopus 로고    scopus 로고
    • Class II diterpene synthases are also known to utilise alkene protonation to initiate biosynthesis. 3 Although 1-4 possess a Z configured C-17 alkene which might arise from 2Z-geranylfarnesol, we chose to show the 2E-geranylfarnesol as the precursor as previous work with the squalene-hopene cyclase had shown it to be a much better precursor of cyclized products. 2 However, either the 2E or 2Z isomer could lead to the same cationic intermediates (C, Scheme 1) via cyclisation. Indeed, the precursor may be the (pyro)phosphate ester of geranylfarnesol as this would not be expected to significantly affect the chemistry shown and would provide a strong interaction with the cyclase active site For reviews of quantum mechanical studies of terpene biosynthetic pathways, see
    • K. U. Wendt G. E. Schulz G. E. E. J. Corey D. R. Liu Angew. Chem., Int. Ed. 2000 39 2812 2833
    • (2000) Angew. Chem., Int. Ed. , vol.39 , pp. 2812-2833
    • Wendt, K.U.1    Schulz, G.E.2    Corey, G.E.E.J.3    Liu, D.R.4
  • 28
    • 84887788807 scopus 로고    scopus 로고
    • Interconversion between the twist-boat and chair conformers of β- C entails significant molecular motions, especially of the C-17 methyl and C-18 hydroxymethyl groups. Steric and hydrogen-bonding interactions between these groups and active-site residues could disfavor twist-boat → chair conversion relative to hydride migration. While the initial 1,2-hydride shift leading from β- C to β- D is computed to be uphill by 4.5 kcal mol-1, the next step in the cascade is significantly downhill, thereby limiting reversion of β- D back to β- C. That is, the intermediate derived from 1,2-methyl migration from C-13 to C-18 in β- D is 9.3 kcal mol-1 lower in energy than the twist-boat form of β- C (see the ESI)
    • D. J. Tantillo Nat. Prod. Rep. 2013 30 1079 1086
    • (2013) Nat. Prod. Rep. , vol.30 , pp. 1079-1086
    • Tantillo, D.J.1


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.