Stereochemical disposition of the geminal dimethyl groups in the enzymatic cyclization of geranyl diphosphate to (+)-bornyl diphosphate by recombinant (+)-bornyl diphosphate synthase from Salvia officinalis
作者:Mitchell L Wise、Hyung-Jung Pyun、Greg Helms、Bryce Assink、Robert M Coates、Rodney B Croteau
DOI:10.1016/s0040-4020(01)00451-3
日期:2001.6
Regiospecifically deuterated geranyl diphosphate, in concert with NMR spectrometry, was employed to demonstrate that the trans-methyl group (C8) of geranyl diphosphate becomes the C9 carbon of (+)-bornyl diphosphate (geminal methyl syn to the diphosphate moiety) and that the cis-methyl group (C9) becomes the C8 (geminal methyl anti to the diphosphate). The syntheses of the relevant substrates and products, with accompanying spectrometric data are provided. (C) 2001 Elsevier Science Ltd. All rights reserved.
Syn Stereochemistry of Cyclic Ether Formation in 1,8-Cineole Biosynthesis Catalyzed by Recombinant Synthase from <i>Salvia officinalis</i>
作者:Mitchell L. Wise、Marek Urbansky、Gregory L. Helms、Robert M. Coates、Rodney Croteau
DOI:10.1021/ja0265714
日期:2002.7.1
Regiospecifically labeled geranyl diphosphates ((2E,6E)-[1,1,8,8,8-(2)H(5)]- and (2E,6Z)-[1,1,9,9,9-(2)H(5)]-GDP) and D(2)O incorporation, in concert with NMR spectrometry, were employed to demonstrate a unique intramolecular syn-facial protonation-cyclization mechanism of action of 1,8-cineole synthase.