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pH对小分子调控凝血酶活性实验的影响
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摘要
在细胞和有机体的行使正常生理功能时,对于酶的活性的精准调控十分重要。利用光来调控蛋白质的行为,是一种从时间和空间上调控酶催化产物的生产和降解的重要方法。体外筛选得到的适配子,是一类与靶标有较高亲和力的寡聚核苷酸分子,他们常被用于酶活性的调控。我们依据偶氮苯衍生物与端粒DNA之间的分子识别的基础上,建立了一种光引发小分子开关可逆性调控酶的方法。偶氮苯衍生物在365 nm紫外光和大于400 nm的可见光照射下实现反式和顺式构型之间的转换~([2]),分别引起适配子DNA结构的压缩或者伸展,从而影响适配子与酶的结合情况,进而影响酶的活性。我们将待调控的酶设定为凝血酶,研究了其体外催化活性。并且,将这项研究成功用于在人血浆中调节凝血~([1])。这份工作美中不足的是没有考虑pH对化合物稳定性和化合物调控反应的影响,众所周知,酶活性与pH密切相关,作为补充,我们系统地研究了pH的影响。
The reversible regulation of the cellular enzymes can have profound importance in biology,The light-regulation of proteins serves as an important method for the spatiotemporal control over the production and degradation of an enzyme product.Aptamers generated by in vitro selection can specifically bind to their targets with a high affinity.Therefore,they have been used to control enzymatic activities.We demonstrate the light controlled reversible regulation of the enzyme using a small-molecule-triggered switch,which is based on molecular recognition between an azobenzene derivative and telomere DNA.This molecule interconverts between the trans and cis states under alternate 365 nm UV and visible light irradiation,which consequently triggers the compaction and extension of telomere DNA.Dynamic light scattering is used to investigate the catalytic activity of thrombin.Furthermore,this strategy has been successfully used to effectively control blood clotting in human plasma.Finally,this work is also supplemented by the influence of pH.
引文
[1]Tian T.;Song Y.;Wang J.;Fu B.;He Z.;Xu X.;Li A.;Zhou X.Wang,S.;Zhou X.Small-molecule-triggered and light-controlled reversible regulation of enzymatic activity.J.Am.Chem.Soc.2016,138:955-961.
    [2]Wang,X.;Huang,J.;Zhou,Y.;Yan,S.;Weng,X.;Wu,X.;Deng,M.;Zhou,X.Angew.Chem.Int.Ed.Engl.2010,49:5305-5309.

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