physiological role) has long remained unexplored. In this study, we demonstrate the atypical in vitro activity of human FMO5 as a Baeyer–Villiger mono-oxygenase on a broad range of substrates, revealing the first example to date of a human protein catalyzing such reactions. The isolated and purified protein was active on diverse carbonyl compounds, whereas soft nucleophiles were mostly non- or poorly
An Enzymatic Toolbox for Cascade Reactions: A Showcase for an In Vivo Redox Sequence in Asymmetric Synthesis
作者:Nikolin Oberleitner、Christin Peters、Jan Muschiol、Maria Kadow、Stefan Saß、Thomas Bayer、Patricia Schaaf、Naseem Iqbal、Florian Rudroff、Marko D. Mihovilovic、Uwe T. Bornscheuer
DOI:10.1002/cctc.201300604
日期:2013.12
Baeyer–Villiger monooxygenase are combined in a cascade reaction by coexpression in E. coli to have a recombinant whole‐cell biocatalyst. Such an artificial metabolic “mini”‐pathway provides access to functionalized chiral compounds in high yields and optical purities as exemplified for kinetic resolutions, desymmetrizations, and regiodivergent biotransformations.
The ability of horseliveralcoholdehydrogenase (HLADH) to the enantioselective oxidation of primary–primary, primary–secondary and primary-tertiary aliphatic 1,5- and 1,6-diols 1a–i was studied. No enantioselectivity of the transformations of primary–primary 1,6-diols 1a–d to ɛ-lactones 4a–d was observed. Regioselective oxidation of primary–secondary 1,6-diols 1e,f and 1,5-diols 1h,i afforded enantiomerically
Towards Practical Baeyer-Villiger-Monooxygenases: Design of Cyclohexanone Monooxygenase Mutants with Enhanced Oxidative Stability
作者:Diederik J. Opperman、Manfred T. Reetz
DOI:10.1002/cbic.201000464
日期:2010.12.10
mutations of selected cysteine and methionine residues in cyclohexanonemonooxygenase (CHMO) gave rise to two mutants with either oxidative or thermal stability. We propose that oxidation‐stable mutants might well be a “prerequisite” for thermostabilization, because laboratory‐evolved thermostability in CHMO might be masked by a high degree of oxidation instability.
Enzymatic Resolution of Medium-Ring Lactones. Synthesis of (<i>S</i>)-(+)-Phoracantholide I
作者:Elie Fouque、Gérard Rousseau
DOI:10.1055/s-1989-27351
日期:——
The horse liver and pig liver esterase hydrolysis of racemic medium ring lactones gives with excellent enantiomeric excess the S- (or R) lactones and the corresponding R- (or S) hydroxy acids. This is the first general method to obtain optically pure medium ring lactones. Application to the preparation of (S)-(+)-Phoracantholide I is reported.
马肝和猪肝酯酶对外消旋中环内酯的水解反应,以优异的对映体过量得到 S-(或 R)内酯和相应的 R-(或 S)羟基酸。这是获得光学纯中环内酯的第一个通用方法。报道了该方法在制备 (S)-(+)-Phoracantholide I 中的应用。