创建一对立体化学互补的生物催化剂
Gavin J Williams1, Thomas Woodhall, Lorna M Farnsworth
1Astbury Centre for Structural Molecular Biology and School of Chemistry, University of Leeds, Leeds, LS2 9JT, United Kingdom.
Journal of the American Chemical Society
|December 15, 2006
概括
研究人员使用定向进化技术设计了N-乙神经氨基酸酶 (NAL) 变体,以克服碳-碳键形成中的面部选择性差. 这些互补的生物催化剂使酸模仿剂的高度二元选择性合成成为可能,扩大了合成化学的应用.
科学领域:
- 生物催化和酶工程 生物催化和酶工程
- 合成有机化学 合成有机化学
- 立体选择性合成
背景情况:
- 酸酶 (N-Acetylneuraminic acid lyase,简称NAL) 在碳-碳键形成方面通常表现出有限的面部选择性,限制了其在合成化学中的使用.
- 现有的NAL催化反应产生二聚体产物的混合物,需要改进的催化方法来精确的立体化学控制.
研究的目的:
- 设计立体化学互补的NAL变体,以提高合成酸模仿剂的选择性.
- 克服野生类型NAL在实现特定产品配置的高度隔离选择性合成方面的局限性.
主要方法:
- 利用结构分析指导的定向进化,包括易出错的PCR和位点定向突变发生,以结构分析为指导.
- 专注于修改活性部位残留物以改变NAL催化醇反应的立体化学结果.
- 开发了互补的变种 (E192N/T167G和E192N/T167V/S208V),具有对替代产品配置的高选择性.
主要成果:
- 创建了NAL变体,具有大约50倍的选择性,用于裂解4S或4R配置的凝结产品.
- 从相同的原料中获得4S和4R配置的酸模仿产品的高度二元选择性合成 (>98:2).
- 证明野生类型的NAL仅为所需的产品配置提供了边际的动力和热力学优势.
结论:
- 将非选择性阿尔多酶转化为一对具有显著立体化学控制的互补生物催化剂.
- 工程 NAL 变种提供了一个强大的工具,用于二分体选择性合成酸模仿剂.
- 已识别的关键残留物被保存,这表明这种方法可以应用于开发其他生物催化剂来合成生物活性分子.
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