Carbon-carbon bonds by hydrolytic enzymes

被引:216
作者
Branneby, C
Carlqvist, P
Magnusson, A
Hult, K
Brinck, T [1 ]
Berglund, P
机构
[1] AlbaNova Univ Ctr, KTH, Dept Biotechnol, SE-10691 Stockholm, Sweden
[2] KTH, Dept Phys Chem, SE-10044 Stockholm, Sweden
关键词
D O I
10.1021/ja028056b
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Enzymes are efficient catalysts in synthetic chemistry, and their catalytic activity with unnatural substrates in organic reaction media is an area attracting much attention. Protein engineering has opened the possibility to change the reaction specificity of enzymes and allow for new reactions to take place in their active sites. We have used this strategy on the well-studied active-site scaffold offered by the serine hydrolase Candida antarctica lipase B (CALB, EC 3.1.1.3) to achieve catalytic activity for aldol reactions. The catalytic reaction was studied in detail by means of quantum chemical calculations in model systems. The predictions from the quantum chemical calculations were then challenged by experiments. Consequently, Ser105 in CALB was targeted by site-directed mutagenesis to create enzyme variants lacking the nucleophilic feature of the active site. The experiments clearly showed an increased reaction rate when the aldol reaction was catalyzed by the mutant enzymes as compared to the wild-type lipase. We expect that the new catalytic activity, harbored in the stable protein scaffold of the lipase, will allow aldol additions of substrates, which cannot be reached by traditional aldolases. Copyright © 2003 American Chemical Society.
引用
收藏
页码:874 / 875
页数:2
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