Direct Epoxidation in Candida antarctica Lipase B Studied by Experiment and Theory
Abstract Candida antarctica lipase B (CALB) is a promiscuous serine hydrolase that, besides its native function, catalyzes different side reactions, such as direct epoxidation. A single‐point mutant of CALB demonstrated a direct epoxidation reaction mechanism for the epoxidation of α,β‐unsaturated a...
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crwiley:10.1002/cbic.200800318 2024-09-15T17:44:12+00:00 Direct Epoxidation in Candida antarctica Lipase B Studied by Experiment and Theory Svedendahl, Maria Carlqvist, Peter Branneby, Cecilia Allnér, Olof Frise, Anton Hult, Karl Berglund, Per Brinck, Tore 2008 http://dx.doi.org/10.1002/cbic.200800318 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fcbic.200800318 https://onlinelibrary.wiley.com/doi/full/10.1002/cbic.200800318 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor ChemBioChem volume 9, issue 15, page 2443-2451 ISSN 1439-4227 1439-7633 journal-article 2008 crwiley https://doi.org/10.1002/cbic.200800318 2024-07-09T04:14:59Z Abstract Candida antarctica lipase B (CALB) is a promiscuous serine hydrolase that, besides its native function, catalyzes different side reactions, such as direct epoxidation. A single‐point mutant of CALB demonstrated a direct epoxidation reaction mechanism for the epoxidation of α,β‐unsaturated aldehydes by hydrogen peroxide in aqueous and organic solution. Mutation of the catalytically active Ser105 to alanine made the previously assumed indirect epoxidation reaction mechanism impossible. Gibbs free energies, activation parameters, and substrate selectivities were determined both computationally and experimentally. The energetics and mechanism for the direct epoxidation in CALB Ser105Ala were investigated by density functional theory calculations, and it was demonstrated that the reaction proceeds through a two step‐mechanism with formation of an oxyanionic intermediate. The active‐site residue His224 functions as a general acid‐base catalyst with support from Asp187. Oxyanion stabilization is facilitated by two hydrogen bonds from Thr40. Article in Journal/Newspaper Antarc* Antarctica Wiley Online Library ChemBioChem 9 15 2443 2451 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract Candida antarctica lipase B (CALB) is a promiscuous serine hydrolase that, besides its native function, catalyzes different side reactions, such as direct epoxidation. A single‐point mutant of CALB demonstrated a direct epoxidation reaction mechanism for the epoxidation of α,β‐unsaturated aldehydes by hydrogen peroxide in aqueous and organic solution. Mutation of the catalytically active Ser105 to alanine made the previously assumed indirect epoxidation reaction mechanism impossible. Gibbs free energies, activation parameters, and substrate selectivities were determined both computationally and experimentally. The energetics and mechanism for the direct epoxidation in CALB Ser105Ala were investigated by density functional theory calculations, and it was demonstrated that the reaction proceeds through a two step‐mechanism with formation of an oxyanionic intermediate. The active‐site residue His224 functions as a general acid‐base catalyst with support from Asp187. Oxyanion stabilization is facilitated by two hydrogen bonds from Thr40. |
format |
Article in Journal/Newspaper |
author |
Svedendahl, Maria Carlqvist, Peter Branneby, Cecilia Allnér, Olof Frise, Anton Hult, Karl Berglund, Per Brinck, Tore |
spellingShingle |
Svedendahl, Maria Carlqvist, Peter Branneby, Cecilia Allnér, Olof Frise, Anton Hult, Karl Berglund, Per Brinck, Tore Direct Epoxidation in Candida antarctica Lipase B Studied by Experiment and Theory |
author_facet |
Svedendahl, Maria Carlqvist, Peter Branneby, Cecilia Allnér, Olof Frise, Anton Hult, Karl Berglund, Per Brinck, Tore |
author_sort |
Svedendahl, Maria |
title |
Direct Epoxidation in Candida antarctica Lipase B Studied by Experiment and Theory |
title_short |
Direct Epoxidation in Candida antarctica Lipase B Studied by Experiment and Theory |
title_full |
Direct Epoxidation in Candida antarctica Lipase B Studied by Experiment and Theory |
title_fullStr |
Direct Epoxidation in Candida antarctica Lipase B Studied by Experiment and Theory |
title_full_unstemmed |
Direct Epoxidation in Candida antarctica Lipase B Studied by Experiment and Theory |
title_sort |
direct epoxidation in candida antarctica lipase b studied by experiment and theory |
publisher |
Wiley |
publishDate |
2008 |
url |
http://dx.doi.org/10.1002/cbic.200800318 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fcbic.200800318 https://onlinelibrary.wiley.com/doi/full/10.1002/cbic.200800318 |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
ChemBioChem volume 9, issue 15, page 2443-2451 ISSN 1439-4227 1439-7633 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/cbic.200800318 |
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ChemBioChem |
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9 |
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15 |
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2443 |
op_container_end_page |
2451 |
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1810491617961836544 |