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A theoretical study of th azidolysis and cyanolysis of epozides by haloalcohol dehalogenase
KTH, School of Biotechnology (BIO), Theoretical Chemistry.
KTH, School of Biotechnology (BIO), Theoretical Chemistry.
(English)Manuscript (Other academic)
National Category
Biochemistry and Molecular Biology
Identifiers
URN: urn:nbn:se:kth:diva-7171OAI: oai:DiVA.org:kth-7171DiVA: diva2:12098
Note
QC 20101108Available from: 2007-05-22 Created: 2007-05-22 Last updated: 2010-11-08Bibliographically approved
In thesis
1. Quantum chemical studies of epoxide-transforming enzymes
Open this publication in new window or tab >>Quantum chemical studies of epoxide-transforming enzymes
2007 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

Density functional theory is employed to study the reaction mechanisms of different epoxide-transforming enzymes. Calculations are based on quantum chemical active site models, which are build from X-ray crystal structures. The models are used to study conversion of various epoxides into their corresponding diols or substituted alcohols. Epoxide-transforming enzymes from three different families are studied. The human soluble epoxide hydrolase (sEH) belongs to the α/β-hydrolase fold family. sEH employs a covalent mechanism to hydrolyze various epoxides into vicinal diols. The Rhodococcus erythrobacter limonene epoxide hydrolase (LEH) constitutes a novel epoxide hydrolase, which is considered the founding member of a new family of enzymes. LEH mediates transformation of limone-1,2-epoxide into the corresponding vicinal diol by employing a general acid/general base-mediated mechanism. The Agrobacterium radiobacter AD1 haloalcohol dehalogenase HheC is related to the short-chain dehydrogenase/reductases. HheC is able to convert epoxides using various nucleophiles such as azide, cyanide, and nitrite. Reaction mechanisms of these three enzymes are analyzed in depth and the role of different active site residues is studied through in silico mutations. Steric and electronic factors influencing the regioselectivity of epoxide opening are identified. The computed energetics help to explain preferred reaction pathways and experimentally observed regioselectivities. Our results confirm the usefulness of the employed computational methodology for investigating enzymatic reactions.

Place, publisher, year, edition, pages
Stockholm: KTH, 2007. x, 58 p.
Series
Trita-BIO-Report, ISSN 1654-2312 ; 2007:3
National Category
Biochemistry and Molecular Biology
Identifiers
urn:nbn:se:kth:diva-4390 (URN)978-91-7178-640-1 (ISBN)
Presentation
2007-05-11, FD41, AlbaNova, 10:00
Opponent
Supervisors
Note
QC 20101108Available from: 2007-05-22 Created: 2007-05-22 Last updated: 2010-11-08Bibliographically approved

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  • apa
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