Development of an<i>R</i>-Selective Amine Oxidase with Broad Substrate Specificity and High Enantioselectivity
作者:Rachel S. Heath、Marta Pontini、Beatrice Bechi、Nicholas J. Turner
DOI:10.1002/cctc.201301008
日期:2014.4
Amine oxidases are useful bio‐catalysts for the synthesis of enantiomerically pure 1°, 2° and 3° chiral amines. Enzymes in this class (e.g., MAO‐N from Aspergillus niger) reported previously have been shown to be highly S selective. Herein we report the development of an enantiocomplementary R‐selective amine oxidase based on 6‐hydroxy‐D‐nicotine oxidase (6‐HDNO) with broadened substrate scope and
A Methyl Scan of the Pyrrolidinium Ring of Nicotine Reveals Significant Differences in Its Interactions with <i>α</i>7 and <i>α</i>4<i>β</i>2 Nicotinic Acetylcholine Receptors
作者:Hong Xing、Kristin W. Andrud、Ferenc Soti、Anne Rouchaud、Stephan C. Jahn、Ziang Lu、Yeh-Hyon Cho、Sophia Habibi、Patrick Corsino、Svetoslav Slavov、James R. Rocca、Jon M. Lindstrom、Ron J. Lukas、William R. Kem
DOI:10.1124/mol.119.118786
日期:2020.8
with α4β2 but not α7receptors. The 2'-methylation uniquely enhanced binding and agonist potency at α7receptors. Although 3'- and 5'-trans-methylations were much better tolerated by α7receptors than α4β2receptors, 4'-methylation decreased potency and efficacy at α7receptors much more than at α4β2receptors. Whereas cis-5'-methylnicotine lacked agonist activity and displayed a low affinity at both
Formation of N′-ethyl-S-nornicotine by transformed root cultures of Nicotiana rustica
作者:Henry D. Boswell、Allan B. Watson、Nicholas J. Walton、David J. Robins
DOI:10.1016/s0031-9422(00)90797-0
日期:1993.8
N-Ethylputrescine dihydrochloride has been synthesized by an improved procedure and it is converted by transformed root cultures of Nicotiana rustica into the nicotine analogue, N'-ethyl-S-nornicotine, preferentially in the optically active S-form, with an efficiency similar to that of the corresponding natural process.
v. Braun; Weissbach, Chemische Berichte, 1930, vol. 63, p. 2018,2026