人工金属蛋白酶的活性部位包括阿尔代基和Cu (II) 环复合体
Sang Ho Yoo1, Byoung June Lee, Hyunsook Kim
1Contribution from the Department of Chemistry, Seoul National University, Seoul 151-747, Korea.
Journal of the American Chemical Society
|June 30, 2005
概括
研究人员使用聚烯上的铜复合物和基组开发了人工金属蛋白酶. 这些催化剂有效地在特定位置分裂各种蛋白质,以高效率和选择性模仿自然蛋白酶活性.
科学领域:
- 生物化学和分子生物学
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
背景情况:
- 设计人工蛋白酶对于理解蛋白质水解和开发新生物技术工具至关重要.
- 现有的人工蛋白酶往往缺乏广泛的基质特异性或精确的裂变位点向.
研究的目的:
- 合成和表征新型聚合物人工金属蛋白酶,能够在选定的部位分裂广泛的蛋白质骨干.
- 研究设计的人造蛋白质酶的催化效率,基质选择性和裂变机制.
主要方法:
- 人工活性位点的合成,包括一个铜II) 环复合物 (CuII) Cyc和一个在交联聚烯上固定的基.
- 在优化条件下 (50°C,pH值9.0-9.5) 用人工蛋白质酶化各种蛋白质基质 (肌红蛋白,球蛋白,专蛋白,溶酶,卵蛋白).
- 动力分析 (K(m), k(cat)), imine复杂的捕获实验 (NaB(OAc) ((3) H),质谱学 (MALDI-TOF MS) 和酶测序 (碳氧酶A,素) 以确定分裂部位和产品.
主要成果:
- 合成的聚合物人工金属蛋白酶表现出广泛的基质选择性,分裂所有测试的蛋白质.
- 观察到和动态行为,与自然蛋白酶相比的迈凯利斯常数 (K(m)) 和催化速率 (k(cat)) 表明有效的水解.
- 特定的裂变部位,如Gln91) -Ser92) 和Ala94) -Thr95) 在肌球蛋白中,被确定并归因于催化组的接近和一般的酸性协助.
结论:
- 设计的人工蛋白酶实现了广泛的基质选择性,高的裂变部位选择性和显著的蛋白质分解率.
- 化物结合点和Cu (II) Cyc催化组在聚乙烯支架上的战略定位是它们增强性能的关键.
- 这些发现为开发复杂的人工酶铺平了道路,为研究和治疗应用量身定制的蛋白质分解能力.
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