Enantiodifferentiation of ketoprofen by Japanese firefly luciferase from Luciola lateralis
作者:Dai-ichiro Kato、Tomohiro Tatsumi、Asami Bansho、Keisuke Teruya、Hiromitsu Yoshida、Masahiro Takeo、Seiji Negoro
DOI:10.1016/j.molcatb.2011.01.008
日期:2011.5
Recently, we found that firefly luciferase exhibited (R)-enantioselective thioesterification activity toward 2-arylpropanoic acids. In the case of Japanese firefly luciferase from Luciola lateralis (LUG-H), the E-value for ketoprofen was approximately 20. In this study, we used a spectrophotometric method to measure the catalytic activity of LUG-H. Using this method allowed us to judge the reaction efficiency easily. Our results confirmed that LUG-H exhibits enantioselective thioesterification activity toward a series of 2-arylpropanoic acids. The highest activity was observed with ketoprofen. We also observed high enzymatic activity of LUC-H toward long-chain fatty acids. These results were reasonable because LUC-H is homologous with long-chain acyl-CoA synthetase. To obtain further information about the enantiodifferentiation mechanism of the LUC-H catalyzed thioesterification of ketoprofen, we determined the kinetic parameters of the reaction relative to each of its three substrates: ketoprofen, ATP, and coenzyme A (CoASH). We found that whereas the affinities of each compound are not affected by the chirality of ketoprofen, enantiodifferentiation is achieved by a chirality-dependent difference in the K(cat) parameter. (C) 2011 Elsevier B.V. All rights reserved.