Enantioselective transesterification catalysis by nanosized serine protease subtilisin Carlsberg particles in tetrahydrofuran

TETRAHEDRON

卷:66

Article

Castillo, Betzaida¹  Delgado, Yamixa¹  Barletta, Gabriel²  Griebenow, Kai¹ 

[1] Univ Puerto Rico, Dept Chem, Rio Piedras, PR 00931 USA

[2] Univ Puerto Rico, Dept Chem, Coll Humacao, CUH Stn, Humacao, PR 00791 USA

关键词: Enantioselective catalysis;    Non-aqueous enzymology;    Enzyme;    Secondary alcohol;    Serine protease;   

DOI  :  10.1016/j.tet.2010.01.053

来源: Elsevier

【 摘 要 】

Enzyme catalysis in organic solvents is a powerful tool for stereo-selective synthesis but the enantioselectivity is still hard to pi edict To overcome this obstacle. we employed a nanoparticulate formulation of subtilisin Carlsberg (SC) and designed a series of 14 structurally related racemic alcohols They were employed in the model transesterification reaction with vinyl butyrate and the enantioselectivities were determined. In general. short alcohol side chains led to low enantioselectivties, while larger and bulky side chains caused better discrimination of the enantiomers by the enzyme With several bulky substrates high enantioselectivities with E>100 were obtained Computational modeling highlighted that key to high enantioselectivity is the discrimination of the R and S substrates by the sole hydrophobic binding pocket based on their size and bulkiness While bulky S enantiomer side chains could be accommodated within the binding pocket, bulky R enantiomer side chains could not However, when also the S enantiomer side chain becomes too large and does not fit into the binding pocket anymore. enantioselectivity accordingly drops (C) 2010 Elsevier Ltd All rights reserved

【 授权许可】

Free