The present invention provides engineered ketoreductase and phosphite dehydrogenase enzymes having improved properties as compared to a naturally occurring wild-type ketoreductase and phosphite dehydrogenase enzymes, as well as polynucleotides encoding the engineered ketoreductase and phosphite dehydrogenase enzymes, host cells capable of expressing the engineered ketoreductase and phosphite dehydrogenase enzymes, and methods of using the engineered ketoreductase and phosphite dehydrogenase enzymes to synthesize a chiral catalyst used in the synthesis of antiviral compounds, such as nucleoside inhibitors. The present invention further provides methods of using the engineered enzymes to deracemize a chiral alcohol in a one-pot, multi-enzyme system.
                            本发明提供了与天然野生型酮还原酶和
亚磷酸酯脱氢酶相比具有更好性质的工程酮还原酶和
亚磷酸酯脱氢酶,以及编码工程酮还原酶和
亚磷酸酯脱氢酶的多核苷酸、能够表达工程酮还原酶和
亚磷酸酯脱氢酶的宿主细胞,以及使用工程酮还原酶和
亚磷酸酯脱氢酶合成用于合成核苷
抑制剂等抗病毒化合物的手性催化剂的方法。本发明进一步提供了在一锅多酶系统中使用工程酶脱手性醇的方法。