Enantioselective catabolism of racemic serine: preparation of d-serine using whole cells of Fusobacterium nucleatum
作者:Mohammad Ramezani、Robert L. White
DOI:10.1016/j.tetasy.2011.07.026
日期:2011.7
single cation-exchange step. After recrystallization, 83% of the d-serine in the initial racemate was recovered with >99% ee (HPLC) and 98% purity (HPLC). This anaerobic microbial approach provides a viable complementary method for generating d-serine, a valuable chiral starting material for chemical synthesis.
将消旋丝氨酸与厌氧细菌核梭菌一起孵育会产生高对映体过量(> 95%)的d-丝氨酸。当核果镰刀菌时,L-氨基酸的选择性降解是最有效的以高细胞密度(约50-100 g湿细胞/ L)重悬于缓冲液中;一次孵育可以有效地从外消旋混合物中去除几乎所有的l-丝氨酸,初始浓度最高可达800 mM(溶解度极限)。通过单个阳离子交换步骤将产物d-氨基酸与代谢终产物(乙酸盐,丁酸盐和乳酸盐)和缓冲液成分分离。重结晶后,以> 99%ee(HPLC)和98%纯度(HPLC)回收了初始外消旋体中的83%d-丝氨酸。这种厌氧微生物方法为生成d-丝氨酸提供了可行的补充方法,d-丝氨酸是用于化学合成的有价值的手性起始材料。