Open and closed states of Candida antarctica lipase B: protonation and the mechanism of interfacial activation1
Lipases (EC 3.1.1.3) are ubiquitous hydrolases for the carboxyl ester bond of water-insoluble substrates, such as triacylglycerols, phospholipids, and other insoluble substrates, acting in aqueous as well as in low-water media, thus being of considerable physiological significance with high interest...
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ftdoajarticles:oai:doaj.org/article:61dfb3ac0a00400fb8646832c0473ad1 2023-05-15T14:05:17+02:00 Open and closed states of Candida antarctica lipase B: protonation and the mechanism of interfacial activation1 Benjamin Stauch Stuart J. Fisher Michele Cianci 2015-12-01T00:00:00Z https://doi.org/10.1194/jlr.M063388 https://doaj.org/article/61dfb3ac0a00400fb8646832c0473ad1 EN eng Elsevier http://www.sciencedirect.com/science/article/pii/S0022227520309536 https://doaj.org/toc/0022-2275 0022-2275 doi:10.1194/jlr.M063388 https://doaj.org/article/61dfb3ac0a00400fb8646832c0473ad1 Journal of Lipid Research, Vol 56, Iss 12, Pp 2348-2358 (2015) fatty acid/metabolism lipids/chemistry enzymology/enzyme regulation X-ray crystallography Biochemistry QD415-436 article 2015 ftdoajarticles https://doi.org/10.1194/jlr.M063388 2022-12-31T10:52:05Z Lipases (EC 3.1.1.3) are ubiquitous hydrolases for the carboxyl ester bond of water-insoluble substrates, such as triacylglycerols, phospholipids, and other insoluble substrates, acting in aqueous as well as in low-water media, thus being of considerable physiological significance with high interest also for their industrial applications. The hydrolysis reaction follows a two-step mechanism, or “interfacial activation,” with adsorption of the enzyme to a heterogeneous interface and subsequent enhancement of the lipolytic activity. Among lipases, Candida antarctica lipase B (CALB) has never shown any significant interfacial activation, and a closed conformation of CALB has never been reported, leading to the conclusion that its behavior was due to the absence of a lid regulating the access to the active site. The lid open and closed conformations and their protonation states are observed in the crystal structure of CALB at 0.91 Å resolution. Having the open and closed states at atomic resolution allows relating protonation to the conformation, indicating the role of Asp145 and Lys290 in the conformation alteration. The findings explain the lack of interfacial activation of CALB and offer new elements to elucidate this mechanism, with the consequent implications for the catalytic properties and classification of lipases. Article in Journal/Newspaper Antarc* Antarctica Directory of Open Access Journals: DOAJ Articles Journal of Lipid Research 56 12 2348 2358 |
institution |
Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
topic |
fatty acid/metabolism lipids/chemistry enzymology/enzyme regulation X-ray crystallography Biochemistry QD415-436 |
spellingShingle |
fatty acid/metabolism lipids/chemistry enzymology/enzyme regulation X-ray crystallography Biochemistry QD415-436 Benjamin Stauch Stuart J. Fisher Michele Cianci Open and closed states of Candida antarctica lipase B: protonation and the mechanism of interfacial activation1 |
topic_facet |
fatty acid/metabolism lipids/chemistry enzymology/enzyme regulation X-ray crystallography Biochemistry QD415-436 |
description |
Lipases (EC 3.1.1.3) are ubiquitous hydrolases for the carboxyl ester bond of water-insoluble substrates, such as triacylglycerols, phospholipids, and other insoluble substrates, acting in aqueous as well as in low-water media, thus being of considerable physiological significance with high interest also for their industrial applications. The hydrolysis reaction follows a two-step mechanism, or “interfacial activation,” with adsorption of the enzyme to a heterogeneous interface and subsequent enhancement of the lipolytic activity. Among lipases, Candida antarctica lipase B (CALB) has never shown any significant interfacial activation, and a closed conformation of CALB has never been reported, leading to the conclusion that its behavior was due to the absence of a lid regulating the access to the active site. The lid open and closed conformations and their protonation states are observed in the crystal structure of CALB at 0.91 Å resolution. Having the open and closed states at atomic resolution allows relating protonation to the conformation, indicating the role of Asp145 and Lys290 in the conformation alteration. The findings explain the lack of interfacial activation of CALB and offer new elements to elucidate this mechanism, with the consequent implications for the catalytic properties and classification of lipases. |
format |
Article in Journal/Newspaper |
author |
Benjamin Stauch Stuart J. Fisher Michele Cianci |
author_facet |
Benjamin Stauch Stuart J. Fisher Michele Cianci |
author_sort |
Benjamin Stauch |
title |
Open and closed states of Candida antarctica lipase B: protonation and the mechanism of interfacial activation1 |
title_short |
Open and closed states of Candida antarctica lipase B: protonation and the mechanism of interfacial activation1 |
title_full |
Open and closed states of Candida antarctica lipase B: protonation and the mechanism of interfacial activation1 |
title_fullStr |
Open and closed states of Candida antarctica lipase B: protonation and the mechanism of interfacial activation1 |
title_full_unstemmed |
Open and closed states of Candida antarctica lipase B: protonation and the mechanism of interfacial activation1 |
title_sort |
open and closed states of candida antarctica lipase b: protonation and the mechanism of interfacial activation1 |
publisher |
Elsevier |
publishDate |
2015 |
url |
https://doi.org/10.1194/jlr.M063388 https://doaj.org/article/61dfb3ac0a00400fb8646832c0473ad1 |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
Journal of Lipid Research, Vol 56, Iss 12, Pp 2348-2358 (2015) |
op_relation |
http://www.sciencedirect.com/science/article/pii/S0022227520309536 https://doaj.org/toc/0022-2275 0022-2275 doi:10.1194/jlr.M063388 https://doaj.org/article/61dfb3ac0a00400fb8646832c0473ad1 |
op_doi |
https://doi.org/10.1194/jlr.M063388 |
container_title |
Journal of Lipid Research |
container_volume |
56 |
container_issue |
12 |
container_start_page |
2348 |
op_container_end_page |
2358 |
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1766277098836590592 |