Open and closed states of Candida Antarctica lipase B: Protonation and the mechanism of interfacial activation
Abstract 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 sub- strates, acting in aqueous as well as in low-water media, thus being of considerable physiological significance with hi...
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Online Access: | http://hdl.handle.net/11566/245199 https://doi.org/10.1194/jlr.M063388 http://www.jlr.org/content/56/12/2348.full.pdf+html |
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ftupmarcheiris:oai:iris.univpm.it:11566/245199 2024-04-14T08:01:59+00:00 Open and closed states of Candida Antarctica lipase B: Protonation and the mechanism of interfacial activation Stauch, Benjamin Fisher, Stuart J. CIANCI, MICHELE Stauch, Benjamin Fisher, Stuart J. Cianci, Michele 2015 ELETTRONICO http://hdl.handle.net/11566/245199 https://doi.org/10.1194/jlr.M063388 http://www.jlr.org/content/56/12/2348.full.pdf+html eng eng info:eu-repo/semantics/altIdentifier/pmid/26447231 info:eu-repo/semantics/altIdentifier/wos/WOS:000365843800011 volume:56 issue:12 firstpage:2348 lastpage:2358 numberofpages:11 journal:JOURNAL OF LIPID RESEARCH http://hdl.handle.net/11566/245199 doi:10.1194/jlr.M063388 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84948756336 http://www.jlr.org/content/56/12/2348.full.pdf+html Enzymology/enzyme regulation Fatty acid/metabolism Lipids/chemistry X-ray crystallography Crystallography X-Ray Fungal Protein Lipase Protein Conformation Biochemistry Cell Biology Endocrinology info:eu-repo/semantics/article 2015 ftupmarcheiris https://doi.org/10.1194/jlr.M063388 2024-03-21T18:18:27Z Abstract 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 sub- strates, acting in aqueous as well as in low-water media, thus being of considerable physiological significance with high in- terest also for their industrial applications. The hydrolysis reaction follows a two-step mechanism, or “interfacial activa- tion,” with adsorption of the enzyme to a heterogeneous in- terface and subsequent enhancement of the lipolytic activity. Among lipases, Candida antarctica lipase B (CALB) has never shown any significant interfacial activation, and a closed con- formation 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 ob- served 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 clas- sification of lipases.—Stauch, B., S. J. Fisher, and M. Cianci. Open and closed states of Candida antarctica lipase B: proton- ation and the mechanism of interfacial activation. J. Lipid Res. 2015. 56: 2348–2358. Article in Journal/Newspaper Antarc* Antarctica Università Politecnica delle Marche: IRIS Journal of Lipid Research 56 12 2348 2358 |
institution |
Open Polar |
collection |
Università Politecnica delle Marche: IRIS |
op_collection_id |
ftupmarcheiris |
language |
English |
topic |
Enzymology/enzyme regulation Fatty acid/metabolism Lipids/chemistry X-ray crystallography Crystallography X-Ray Fungal Protein Lipase Protein Conformation Biochemistry Cell Biology Endocrinology |
spellingShingle |
Enzymology/enzyme regulation Fatty acid/metabolism Lipids/chemistry X-ray crystallography Crystallography X-Ray Fungal Protein Lipase Protein Conformation Biochemistry Cell Biology Endocrinology Stauch, Benjamin Fisher, Stuart J. CIANCI, MICHELE Open and closed states of Candida Antarctica lipase B: Protonation and the mechanism of interfacial activation |
topic_facet |
Enzymology/enzyme regulation Fatty acid/metabolism Lipids/chemistry X-ray crystallography Crystallography X-Ray Fungal Protein Lipase Protein Conformation Biochemistry Cell Biology Endocrinology |
description |
Abstract 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 sub- strates, acting in aqueous as well as in low-water media, thus being of considerable physiological significance with high in- terest also for their industrial applications. The hydrolysis reaction follows a two-step mechanism, or “interfacial activa- tion,” with adsorption of the enzyme to a heterogeneous in- terface and subsequent enhancement of the lipolytic activity. Among lipases, Candida antarctica lipase B (CALB) has never shown any significant interfacial activation, and a closed con- formation 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 ob- served 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 clas- sification of lipases.—Stauch, B., S. J. Fisher, and M. Cianci. Open and closed states of Candida antarctica lipase B: proton- ation and the mechanism of interfacial activation. J. Lipid Res. 2015. 56: 2348–2358. |
author2 |
Stauch, Benjamin Fisher, Stuart J. Cianci, Michele |
format |
Article in Journal/Newspaper |
author |
Stauch, Benjamin Fisher, Stuart J. CIANCI, MICHELE |
author_facet |
Stauch, Benjamin Fisher, Stuart J. CIANCI, MICHELE |
author_sort |
Stauch, Benjamin |
title |
Open and closed states of Candida Antarctica lipase B: Protonation and the mechanism of interfacial activation |
title_short |
Open and closed states of Candida Antarctica lipase B: Protonation and the mechanism of interfacial activation |
title_full |
Open and closed states of Candida Antarctica lipase B: Protonation and the mechanism of interfacial activation |
title_fullStr |
Open and closed states of Candida Antarctica lipase B: Protonation and the mechanism of interfacial activation |
title_full_unstemmed |
Open and closed states of Candida Antarctica lipase B: Protonation and the mechanism of interfacial activation |
title_sort |
open and closed states of candida antarctica lipase b: protonation and the mechanism of interfacial activation |
publishDate |
2015 |
url |
http://hdl.handle.net/11566/245199 https://doi.org/10.1194/jlr.M063388 http://www.jlr.org/content/56/12/2348.full.pdf+html |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_relation |
info:eu-repo/semantics/altIdentifier/pmid/26447231 info:eu-repo/semantics/altIdentifier/wos/WOS:000365843800011 volume:56 issue:12 firstpage:2348 lastpage:2358 numberofpages:11 journal:JOURNAL OF LIPID RESEARCH http://hdl.handle.net/11566/245199 doi:10.1194/jlr.M063388 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84948756336 http://www.jlr.org/content/56/12/2348.full.pdf+html |
op_doi |
https://doi.org/10.1194/jlr.M063388 |
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Journal of Lipid Research |
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56 |
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12 |
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