Optimization of the Kinetic Resolution of thedl-Phosphomonoesters of Threonine and Serine by Random Mutagenesis of the Acid Phosphatase fromSalmonella enterica
作者:Teunie van Herk、Aloysius F. Hartog、Harald J. Ruijssenaars、Richard Kerkman、Hans E. Schoemaker、Ron Wever
DOI:10.1002/adsc.200700041
日期:2007.6.4
Acidphosphatases are enzymes with a broad substrate specificity showing hydrolytic activity towards several different organic phosphate monoesters, such as nucleotides and sugar phosphates. The acidphosphatase from Salmonella enterica ser. typhimurium LT2 (PhoN-Se) is able to hydrolyze O-phospho-dl-threonine to yield L-threonine with a very high enantioselectivity (E>200). When O-phospho-dl-serine
Enzymatic Synthesis of β-Hydroxy-α-amino Acids Based on Recombinant <scp>d</scp>- and <scp>l</scp>-Threonine Aldolases
作者:Teiji Kimura、Vassil P. Vassilev、Gwo-Jenn Shen、Chi-Huey Wong
DOI:10.1021/ja9720422
日期:1997.12.1
To exploit the enzymatic method for the synthesis of β-hydroxy-α-amino acids, the genes coding for the Escherichia coli l-threonine aldolase (LTA; EC 2.1.2.1) and Xanthomonus oryzae d-threonine aldolase (DTA) were cloned and overexpressed in E. coli through primer-directed polymerase chain reactions. The purified recombinant enzymes were studied with respect to kinetics, specificity, stability, additive