Molecular Basis for the Stereoselective Ammoniolysis of N‐Alkyl Aziridine‐2‐Carboxylates Catalyzed by Candida antarctica Lipase B
Abstract Candida antarctica lipase B catalyzed the stereoselective ammoniolysis of N ‐alkyl aziridine‐2‐carboxylates in t BuOH saturated with ammonia and yielded the (2 S )‐aziridine‐2‐carboxamide and unreacted (2 R )‐aziridine‐2‐carboxylate. Varying the N‐1 substituent on the aziridine ring changed...
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crwiley:10.1002/cbic.200900343 2024-06-23T07:47:51+00:00 Molecular Basis for the Stereoselective Ammoniolysis of N‐Alkyl Aziridine‐2‐Carboxylates Catalyzed by Candida antarctica Lipase B Park, Jae‐Hoon Ha, Hyun‐Joon Lee, Won Koo Généreux‐Vincent, Tobie Kazlauskas, Romas J. 2009 http://dx.doi.org/10.1002/cbic.200900343 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fcbic.200900343 http://onlinelibrary.wiley.com/wol1/doi/10.1002/cbic.200900343/fullpdf en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor ChemBioChem volume 10, issue 13, page 2213-2222 ISSN 1439-4227 1439-7633 journal-article 2009 crwiley https://doi.org/10.1002/cbic.200900343 2024-06-04T06:43:46Z Abstract Candida antarctica lipase B catalyzed the stereoselective ammoniolysis of N ‐alkyl aziridine‐2‐carboxylates in t BuOH saturated with ammonia and yielded the (2 S )‐aziridine‐2‐carboxamide and unreacted (2 R )‐aziridine‐2‐carboxylate. Varying the N‐1 substituent on the aziridine ring changed the rate and stereoselectivity of the reaction. Substrates with a benzyl substituent or a (1′ R )‐1‐phenylethyl substituent reacted approximately ten times faster than substrates with a (1′ S )‐1‐phenylethyl substituent. Substrates with a benzyl substituent showed little stereoselectivity ( E =5–7) while substrates with either a (1′ R )‐ or (1′ S )‐1‐phenylethyl substituent showed high stereoselectivity ( D >50). Molecular modeling by using the current paradigm for enantioselectivity—binding of the slow enantiomer by an exchange‐of‐substituents orientation—could not account for the experimental results. However, modeling an umbrella‐like‐inversion orientation for the slow enantiomer could account for the experimental results. Steric hindrance between the methyl in the (1′ S )‐1‐phenylethyl substituent and Thr138 and Ile189 in the acyl‐binding site likely accounts for the slow reaction. Enantioselectivity likely stems from an unfavorable interaction of the methine hydrogen with Thr40 for the slow enantiomer and from subtle differences in the orientations of the other three substituents. This success in rationalizing the enantioselectivity supports the notion that an umbrella‐like‐inversion orientation can contribute to enantioselectivity in lipases. Article in Journal/Newspaper Antarc* Antarctica Wiley Online Library ChemBioChem 10 13 2213 2222 |
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Wiley Online Library |
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English |
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Abstract Candida antarctica lipase B catalyzed the stereoselective ammoniolysis of N ‐alkyl aziridine‐2‐carboxylates in t BuOH saturated with ammonia and yielded the (2 S )‐aziridine‐2‐carboxamide and unreacted (2 R )‐aziridine‐2‐carboxylate. Varying the N‐1 substituent on the aziridine ring changed the rate and stereoselectivity of the reaction. Substrates with a benzyl substituent or a (1′ R )‐1‐phenylethyl substituent reacted approximately ten times faster than substrates with a (1′ S )‐1‐phenylethyl substituent. Substrates with a benzyl substituent showed little stereoselectivity ( E =5–7) while substrates with either a (1′ R )‐ or (1′ S )‐1‐phenylethyl substituent showed high stereoselectivity ( D >50). Molecular modeling by using the current paradigm for enantioselectivity—binding of the slow enantiomer by an exchange‐of‐substituents orientation—could not account for the experimental results. However, modeling an umbrella‐like‐inversion orientation for the slow enantiomer could account for the experimental results. Steric hindrance between the methyl in the (1′ S )‐1‐phenylethyl substituent and Thr138 and Ile189 in the acyl‐binding site likely accounts for the slow reaction. Enantioselectivity likely stems from an unfavorable interaction of the methine hydrogen with Thr40 for the slow enantiomer and from subtle differences in the orientations of the other three substituents. This success in rationalizing the enantioselectivity supports the notion that an umbrella‐like‐inversion orientation can contribute to enantioselectivity in lipases. |
format |
Article in Journal/Newspaper |
author |
Park, Jae‐Hoon Ha, Hyun‐Joon Lee, Won Koo Généreux‐Vincent, Tobie Kazlauskas, Romas J. |
spellingShingle |
Park, Jae‐Hoon Ha, Hyun‐Joon Lee, Won Koo Généreux‐Vincent, Tobie Kazlauskas, Romas J. Molecular Basis for the Stereoselective Ammoniolysis of N‐Alkyl Aziridine‐2‐Carboxylates Catalyzed by Candida antarctica Lipase B |
author_facet |
Park, Jae‐Hoon Ha, Hyun‐Joon Lee, Won Koo Généreux‐Vincent, Tobie Kazlauskas, Romas J. |
author_sort |
Park, Jae‐Hoon |
title |
Molecular Basis for the Stereoselective Ammoniolysis of N‐Alkyl Aziridine‐2‐Carboxylates Catalyzed by Candida antarctica Lipase B |
title_short |
Molecular Basis for the Stereoselective Ammoniolysis of N‐Alkyl Aziridine‐2‐Carboxylates Catalyzed by Candida antarctica Lipase B |
title_full |
Molecular Basis for the Stereoselective Ammoniolysis of N‐Alkyl Aziridine‐2‐Carboxylates Catalyzed by Candida antarctica Lipase B |
title_fullStr |
Molecular Basis for the Stereoselective Ammoniolysis of N‐Alkyl Aziridine‐2‐Carboxylates Catalyzed by Candida antarctica Lipase B |
title_full_unstemmed |
Molecular Basis for the Stereoselective Ammoniolysis of N‐Alkyl Aziridine‐2‐Carboxylates Catalyzed by Candida antarctica Lipase B |
title_sort |
molecular basis for the stereoselective ammoniolysis of n‐alkyl aziridine‐2‐carboxylates catalyzed by candida antarctica lipase b |
publisher |
Wiley |
publishDate |
2009 |
url |
http://dx.doi.org/10.1002/cbic.200900343 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fcbic.200900343 http://onlinelibrary.wiley.com/wol1/doi/10.1002/cbic.200900343/fullpdf |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
ChemBioChem volume 10, issue 13, page 2213-2222 ISSN 1439-4227 1439-7633 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/cbic.200900343 |
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ChemBioChem |
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10 |
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13 |
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2213 |
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2222 |
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1802638059083137024 |