胆酶机制揭示了单个保存的蛋白质折叠中的根本不同类型的反应
Florian Hubrich1, Puneet Juneja2, Michael Müller1
1Institute of Pharmaceutical Sciences, University of Freiburg , Albertstr. 25, 79104 Freiburg, Germany.
Journal of the American Chemical Society
|August 7, 2015
概括
胆固醇酶是具有制药潜力的酶. 这项研究揭示了不同的反应机制,并确定了关键的氨基酸残留物,以区分胆固醇酶亚家族 (CH-FkbO,CH-Hyg5,CH-XanB2).
科学领域:
- 生物化学
- 酵素学
- 自然产品生物合成
背景情况:
- 胆固醇酶是将胆固醇转化为有价值的天然产品的酶.
- 有三种子家族 (CH-FkbO,CH-Hyg5,CH-XanB2),但它们的机制和产品多样性尚不清楚.
研究的目的:
- 阐明胆固醇酶子家族的独特酶机制.
- 确定不同反应产物的分子基础.
- 建立一种方法来将未知的胆固醇酶分为它们的子家族.
主要方法:
- 蛋白质折叠和活性部位残留物的比较分析.
- 酶动力学研究和反应机制研究.
- 保存图案的多个序列对齐.
主要成果:
- CH-FkbO和CH-Hyg5共享一个折叠,但使用不同的机制 (通过氧化物进行水解与分子内溶解).
- 两个非保存的残留物区分了CH-FkbO和CH-Hyg5机制.
- 第三种残留物可能区分CH-XanB2亚家族,产生区域异构体.
结论:
- 关键的氨基酸残留决定了胆固醇酶子家族的功能和产品的特异性.
- 含有这些残留物的保存图案使得新型胆固醇酶可以被分类为子家族.
- 了解这些机制有助于发现天然产品药物.
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