2005
DOI: 10.1002/anie.200500971
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An S‐Selective Lipase Was Created by Rational Redesign and the Enantioselectivity Increased with Temperature

Abstract: Higher activity with larger pockets: The figure shows a superposition of intermediates that occur in acyl transfer to (S)‐1‐phenylethanol catalyzed by Candida antarctica lipase B (CALB). Wild‐type CALB cannot accomodate the phenyl group (gray) in the stereospecificity pocket and form all of the catalytically essential H bonds. The Trp 104 Ala mutation liberates the volume in yellow, the S enantiomer is easily fitted, and the specificity constant increases by a factor of 130 000.

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Cited by 118 publications
(74 citation statements)
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“…[26][27][28] This enzyme was readily bound to EziG™ within 30 min of incubation while ten days of incubation was required for immobilization on Accurel®. For this variant, EziG™ (HybCPG VBC) is a more suitable carrier than Accurel® based on the bulk volumetric activity and the time needed for immobilization (see Table S2, Supplementary Information).…”
Section: Methodsmentioning
confidence: 99%
“…[26][27][28] This enzyme was readily bound to EziG™ within 30 min of incubation while ten days of incubation was required for immobilization on Accurel®. For this variant, EziG™ (HybCPG VBC) is a more suitable carrier than Accurel® based on the bulk volumetric activity and the time needed for immobilization (see Table S2, Supplementary Information).…”
Section: Methodsmentioning
confidence: 99%
“…In enzymecatalysed reactions, increasing temperature generally decreases selectivity. [52][53][54][55][56][57][58][59][60][61][62] In a few studies, however, enhanced selectivity with increasing temperature, 63,64 or a maximum of enantioselectivity at a certain temperature, 38,65 or even indifference to temperature was found. 66 In most of the quoted examples, the enzyme-catalysed reactions were carried out in batch mode (in stirred or shaken flasks) and only a few studies on the temperature effects on lipase-catalysed KRs were performed in continuous-flow mode so far.…”
Section: Introductionmentioning
confidence: 99%
“…Oft ließ sich die Enantioselektivität durch diese Methoden steigern, eine Umkehrung der Enantioselektivität gelang aber nur in Ausnahmefällen. [2] Interessant für die Synthese sind nur E-Werte > 50 -eine Schwelle, die nur schwer zu überwinden ist, wenn man von einem Enzym mit entgegengesetzter Enantioselektivität ausgeht. Beispielsweise änderten May et al eine d-selektive Hydantoinase in eine l-selektive Variante, mit der allerdings nur 20 % ee erreicht werden konnten, [2d] und Zha et al…”
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