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Rational engineering of CALB for selective monoacylation of diols
KTH, Skolan för bioteknologi (BIO), Biokemi.
KTH, Skolan för bioteknologi (BIO), Biokemi.
(Engelska)Manuskript (preprint) (Övrigt vetenskapligt)
Identifikatorer
URN: urn:nbn:se:kth:diva-13820OAI: oai:DiVA.org:kth-13820DiVA, id: diva2:327474
Anmärkning
QC20100629Tillgänglig från: 2010-06-29 Skapad: 2010-06-29 Senast uppdaterad: 2010-06-29Bibliografiskt granskad
Ingår i avhandling
1. Serine Hydrolase Selectivity: Kinetics and applications in organic and analytical chemistry
Öppna denna publikation i ny flik eller fönster >>Serine Hydrolase Selectivity: Kinetics and applications in organic and analytical chemistry
2010 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

The substrate selectivities for different serine hydrolases were utilized in various applications, presented in papers I-VI. The articles are discussed in the thesis in view of the kinetics of the enzyme catalysis involved.

In paper I the enantioselectivities towards a range of secondary alcohols were reversed for Candida antarctica lipase B by site directed mutagenesis. The thermodynamic components of the enantioselectivity were determined for the mutated variant of the lipase.

In papers II-III Candida antarctica lipase B was engineered for selective monoacylation using two different approaches. A variant of the lipase created for substrate assisted catalysis (paper II) and three different variants with mutations which decreased the volume of the active site (paper III) were evaluated. Enzyme kinetics for the different variants were measured and translated into activation energies for comparison of the approaches.

In papers IV and V three different enzymes were used for rapid analysis of enantiomeric excess and conversion of O-acylated cyanohydrins synthesized by a defined protocol. Horse liver alcohol dehydrogenase, Candida antarctica lipase B and pig liver esterase were sequentially added to a solution containing the O-acylated cyanohydrin. Each enzyme caused a drop in absorbance from oxidation of NADH to NAD+. The product yield and enantiomeric excess was calculated from the relative differences in absorbance.

In paper VI a method for C-terminal peptide sequencing was developed based on conventional Carboxypeptidase Y digestion combined with matrix assisted laser desorption/ionization mass spectrometry. An alternative nucleophile was used to obtain a stable peptide ladder and improve sequence coverage.

Ort, förlag, år, upplaga, sidor
Stockholm: KTH, 2010. s. viii, 62
Serie
Trita-BIO-Report, ISSN 1654-2312 ; 2010:12
Nyckelord
Candida antarctica lipase B, monoacylation of diols, kinetic resolution, thermodynamics in enzyme catalysis, enzyme engineering
Nationell ämneskategori
Biokemi och molekylärbiologi
Identifikatorer
urn:nbn:se:kth:diva-12831 (URN)978-91-7415-663-8 (ISBN)
Disputation
2010-06-04, FD5, AlbaNova University Center, Roslagstullsbacken 21, Stockholm, 15:42 (Engelska)
Opponent
Handledare
Anmärkning
QC20100629Tillgänglig från: 2010-05-24 Skapad: 2010-05-12 Senast uppdaterad: 2010-06-29Bibliografiskt granskad

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