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聚乙烯纳米塑料和α-氨酶相互作用的分子机制及其结合模型:一个多维分析

Huijian Shi¹, Falin He¹, Chengqian Huo¹

¹School of Environmental Science and Engineering, Shandong University, China-America CRC for Environment & Health, Shandong Province, 72# Jimo Binhai Road, Qingdao, Shandong 266237, PR China.

The Science of the total environment

|January 19, 2024

概括

聚乙烯纳米塑料 (PS-NPs) 与α-amylase结合,改变其结构并抑制酶活性. 这种由疏水力驱动的相互作用对生理功能构成威胁.

科学领域:

环境科学环境科学
生物化学生物化学
毒理学毒理学毒理学

背景情况:

纳米塑料 (NP) 是普遍存在的环境污染物,表面积大,易吸附污染物.
由于其生物积累潜力和与生物分子的相互作用,NP对健康构成重大风险.
阿尔法-氨酶 (α-氨酶) 是一种具有重要的氨酶,具有多种生物学作用,但其与NP的相互作用仍然未被探索.

研究的目的:

调查聚乙烯纳米塑料 (PS-NP) 和α-amylase之间的相互作用机制.
阐明PS-NPs结合如何影响α-amylase的结构和酶活性.
探索分子力量在调解PS-NPs-α-amylase相互作用中的作用.

主要方法:

多光谱分析检测蛋白质光和微环境的变化.
在体外酶活性测试量量化α-氨基酶抑制.
分子模拟技术用于预测结合点和相互作用力.

主要成果:

PS-NPs与α-氨基酶结合,导致托和氨酸残留物发生变化,并诱导蛋白质展开.
α-氨基酶的二次结构被破坏,随机卷轴增加和α-螺旋含量减少.
PS-NPs以度依赖的方式抑制α-氨酶活性,而疏水力则调解相互作用.
分子模拟表明PS-NP优先结合α-氨酶活性位点.

结论:

PS-NP与α-氨酶相互作用,导致显著的结构和形状变化.
PS-NPs的结合通过抑制其酶活性,损害了α-氨酶的生理功能.
这项研究强调了与NP暴露相关的潜在健康风险及其对基本生物分子的影响.

关键词:

阿尔法-氨酸酶是什么相互作用机制的相互作用机制.分子模拟分子模拟多光谱技术的使用.纳米塑料是一种纳米塑料.

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