Two Enantiocomplementary Ephedrine Dehydrogenases from <i>Arthrobacter</i> sp. TS-15 with Broad Substrate Specificity
作者:Tarek Shanati、Cameron Lockie、Lilian Beloti、Gideon Grogan、Marion B. Ansorge-Schumacher
DOI:10.1021/acscatal.9b00621
日期:2019.7.5
The recently identified pseudoephedrine and ephedrine dehydrogenases (PseDH and EDH, respectively) from Arthrobacter sp. TS-15 are NADH-dependent members of the oxidoreductase superfamily of short-chain dehydrogenases/reductases (SDRs). They are specific for the enantioselective oxidation of (+)-(S) N-(pseudo)ephedrine and (−)-(R) N-(pseudo)ephedrine, respectively. Anti-Prelog stereospecific PseDH
To research the potential ability of whole marine sponges to act as biocatalysts, this paper describes for the first time the employment of whole Cliona varians sponge in the stereoselective reduction of prochiral alpha-keto esters and isatin to the corresponding chiral alcohols. The addition of D-fructose, D-glucose or sucrose remarkably increased the conversion ratios and stereoselectivities by this marine sponge. Furthermore, in the presence of D-glucose and D-maltose. the reduction of isatin by C. varians afforded the corresponding 3-hydroxyindolin-2-one with high conversions (85-90%) and good enantioselectivities (60-74%). These results showed that the marine sponge presents great potential to be used as biocatalyst for stereoselective reduction of carbonyl compounds.
First Asymmetric Reduction of Isatin by Marine-Derived Fungi
作者:Willian Birolli、Irlon Ferrreira、David Jimenez、Bianca Silva、Bárbara Silva、Angelo Pinto、André Porto
DOI:10.21577/0103-5053.20160256
日期:——
In this study, whole cells of marine-derived fungi were used to reduce isatin (1H-indole2,3-dione) to dioxindole (3-hydroxyindolin-2-one) for 7 days at 32 degrees C. The screening showed that several strains could reduce isatin and produce the enantioenriched dioxindole. The best conversions were obtained by Cladosporium sp. CBMAI 1237 and Westerdykella sp. CBMAI 1679, however, the best enantiomeric excess was obtained only by Aspergillus sydowii CBMAI 935 (66% ee). In conclusion, marine-derived fungi show potential for asymmetric and chemoselective reduction of isatin (1H-indole-2,3-dione).
Stereoselective reduction of diketones by a novel carbonyl reductase from Candida parapsilosis