An Enzyme Library Approach to Biocatalysis: Development of Nitrilases for Enantioselective Production of Carboxylic Acid Derivatives
作者:Grace DeSantis、Zuolin Zhu、William A. Greenberg、Kelvin Wong、Jenny Chaplin、Sarah R. Hanson、Bob Farwell、Lawrence W. Nicholson、Cynthia L. Rand、David P. Weiner、Dan E. Robertson、Mark J. Burk
DOI:10.1021/ja0259842
日期:2002.8.1
and diverse set of nitrilases is reported. The utility of this nitrilaselibrary for identifying enzymes that catalyze efficient production of valuable hydroxy carboxylicacidderivatives is demonstrated. Unprecedented enantioselectivity and substrate scope are highlighted for three newly discovered and distinct nitrilases. For example, a wide array of (R)-mandelic acidderivatives and analogues were
The invention relates to nitrilases and to nucleic acids encoding the nitrilases. In addition methods of designing new nitrilases and method of use thereof are also provided. The nitrilases have increased activity and stability at increased pH and temperature.
Production of alpha-hydroxy-carboxylic acids using a coupled enzyme system
申请人:——
公开号:US20040053382A1
公开(公告)日:2004-03-18
An economical and expedient method is disclosed for the preparation of &agr;-hydroxy-carboxylic acids or salts thereof in very high enantiomeric purity which comprises oxidizing a corresponding &agr;-amino-carboxylic acid or salt thereof using an amino acid deaminase followed by reducing the corresponding &agr;-keto-carboxylic acid or salt produced using a D- or L-lactate dehydrogenase in the combination with an electron donor and an enzyme/substrate system for recycling the electron donor. The resulting &agr;-hydroxy-carboxylic acids, hydrates, and salts thereof are valuable components and intermediates in the preparation of chiral compounds, especially pharmaceuticals. This invention also relates to the use of &agr;-amino-carboxylic acids, hydrates, and salts thereof and a coupled enzyme system in the production of &agr;-hydroxy-carboxylic acids, hydrates, and salts thereof.