特里斯通过线性混合抑制机制抑制GH1β-葡萄糖酶
Rafael S Chagas1, Sandro R Marana1
1Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, São Paulo, SP, Brazil.
一种常见的缓冲剂Tris作为Spodoptera frugiperda GH1β-glucosidase (Sfβgly) 的混合抑制剂. 这种缓冲器可以降低酶活性,并导致不准确的动力参数测量.
科学领域:
- 生物化学 生物化学
- 酶学 是一种酶学.
- 分子生物学分子生物学
背景情况:
- 特里斯 (2-氨基-2-(基甲基) -1,3-二醇) 在生物化学研究中被广泛用作缓冲剂.
- GH1β-葡萄糖酶是参与各种生物过程的酶.
- 精确地描述酶动力学对于理解酶的功能至关重要.
研究的目的:
- 研究Tris对来自Spodoptera frugiperda (Sfβgly) 的GH1β-葡萄糖酶的抑制作用.
- 为了阐明Tris抑制的机制.
- 评估Tris抑制对酶动力学参数确定的影响.
主要方法:
- 进行了酶抑制试验,以确定抑制的类型和运动参数.
- 计算对接研究被用来预测Tris与Sfβgly.的结合方式.
- 考虑了相关酶的结晶学数据.
主要成果:
- 特里斯被确定为Sfβgly的线性混合抑制剂,其Ki值为12 ± 2 mM,α值为3 ± 1.
- 特里斯结合导致非生产性ESI复合物的形成,使酶对基质的亲和力减少了三倍.
- 计算对接支持ESI复合物的形成,并确定了Sfβgly和其他GH1β-葡萄糖酶中Tris的潜在结合点.
结论:
- 特里斯可以显著抑制Sfβgly活性,并导致低估运动参数 (Km和kcat).
- 由于保留了结合点,Tris的抑制机制可能会扩展到其他GH1β-葡萄糖酶.
- 缓冲区的选择对于精确的酶表征至关重要,尤其是在研究GH1β-葡萄糖酶时.
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