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dc.contributor.authorvan der Ent, Florian
dc.contributor.authorLund, Bjarte Aarmo
dc.contributor.authorSvalberg, Linn
dc.contributor.authorPurg, Miha
dc.contributor.authorChukwu, Ghislean
dc.contributor.authorWidersten, Mikael
dc.contributor.authorIsaksen, Geir Villy
dc.contributor.authorBrandsdal, Bjørn Olav
dc.contributor.authorÅqvist, Johan Lennart Gösta
dc.date.accessioned2022-06-16T09:02:37Z
dc.date.available2022-06-16T09:02:37Z
dc.date.issued2022-05-03
dc.description.abstractThe structural origin of enzyme cold-adaptation has been the subject of considerable research efforts in recent years. Comparative studies of orthologous mesophilic–psychrophilic enzyme pairs found in nature are an obvious strategy for solving this problem, but they often suffer from relatively low sequence identity of the enzyme pairs. Small bacterial lipases adapted to distinctly different temperatures appear to provide an excellent model system for these types of studies, as they may show a very high degree of sequence conservation. Here, we report the first crystal structures of lipase A from the psychrophilic bacterium Bacillus pumilus, which confirm the high structural similarity to the mesophilic Bacillus subtilis enzyme, as indicated by their 81% sequence identity. We further employ extensive QM/MM calculations to delineate the catalytic reaction path and its energetics. The computational prediction of a rate-limiting deacylation step of the enzymatic ester hydrolysis reaction is verified by stopped-flow experiments, and steady-state kinetics confirms the psychrophilic nature of the B. pumilus enzyme. These results provide a useful benchmark for examining the structural basis of cold-adaptation and should now make it possible to disentangle the effects of the 34 mutations between the two enzymes on catalytic properties and thermal stability.en_US
dc.identifier.citationvan der Ent, Lund, Svalberg, Purg, Chukwu, Widersten, Isaksen, Brandsdal, Åqvist. Structure and Mechanism of a Cold-Adapted Bacterial Lipase. Biochemistry. 2022en_US
dc.identifier.cristinIDFRIDAID 2021586
dc.identifier.doi10.1021/acs.biochem.2c00087
dc.identifier.issn0006-2960
dc.identifier.issn1520-4995
dc.identifier.urihttps://hdl.handle.net/10037/25489
dc.language.isoengen_US
dc.publisherAmerican Chemical Societyen_US
dc.relation.journalBiochemistry
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2022 The Author(s)en_US
dc.titleStructure and Mechanism of a Cold-Adapted Bacterial Lipaseen_US
dc.type.versionpublishedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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