Mechanistic Investigations of Two Bacterial Diterpene Cyclases: Spiroviolene Synthase and Tsukubadiene Synthase
作者:Patrick Rabe、Jan Rinkel、Etilia Dolja、Thomas Schmitz、Britta Nubbemeyer、T. Hoang Luu、Jeroen S. Dickschat
DOI:10.1002/anie.201612439
日期:2017.3.1
two diterpene cyclases from streptomycetes—one with an unknown product that was identified as the spirocyclic hydrocarbon spiroviolene and one with the known product tsukubadiene—were investigated in detail by isotope labeling experiments. Although the structures of the products were very different, the cyclization mechanisms of both enzymes proceed through the same initial cyclizationreactions, before
Evaluation of Isoprenoid Conformation in Solution and in the Active Site of Protein-Farnesyl Transferase Using Carbon-13 Labeling in Conjunction with Solution- and Solid-State NMR
作者:Todd J. Zahn、Markus Eilers、Zhengmao Guo、Mohamad B. Ksebati、Matthew Simon、Jeffrey D. Scholten、Steven O. Smith、Richard A. Gibbs
DOI:10.1021/ja000860f
日期:2000.8.1
knowledge of the solutionconformation of FPP, as well as its conformation in the active site of FTase. Four bis-13C-labeled derivatives of farnesol and geranylgeraniol have been synthesized and used to prepare the corresponding FPP and GGPP derivatives. The labeled farnesyl and geranylgeranyl derivatives 2−7 were utilized in conjunction with solution 13C NMR to probe the conformation of the prenyl chain
Synthesis and conformational analysis of di-13C-labeled farnesyl diphosphate analogs
作者:Todd J. Zahn、Mohamad B. Ksebati、Richard A. Gibbs
DOI:10.1016/s0040-4039(98)00751-5
日期:1998.6
Two di-C-13-labeled farnesyl diphosphates (2 and 4) have been prepared using modified versions of the isoprenoid triflate route previously developed in this laboratory. The (3)J(CC) coupling constants far the precursor alcohols 1 and 3 are 1.6 Hz and 3.6 Hz, respectively, in CDCl3, and very similar results were obtained for 2 and 4 in D2O. This indicates a skew or gauche conformation about the C-3-C-4 bond and a trans conformation about the C-4-C-5 bond in both farnesol and FPP. (C) 1998 Elsevier Science Ltd. All rights reserved.