在ApmA中,机械性可塑性使得氨基糖化物在耐药性方面具有无序性
Emily Bordeleau1, Peter J Stogios2, Elena Evdokimova2
1David Braley Centre for Antibiotics Discovery, M.G. DeGroote Institute for Infectious Disease Research, Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada.
Nature chemical biology
|November 17, 2023
概括
一种新型的酶ApmA提供了广泛的氨基糖化物抗生素耐药性. 它的独特机制,利用灵活的活性部位histidine,不同于其他耐药性酶,突出显示了细菌耐药性策略的适应性.
科学领域:
- 微生物学 微生物学
- 生物化学 生物化学
- 结构生物学 结构生物学
背景情况:
- 细菌对氨基糖类抗生素的耐药性是一个日益严重的全球健康问题.
- 氨基甘油酸乙转移酶 (AACs) 是一种关键的酶,通过非活化抗生素来赋予耐药性.
- 大多数已知的AAC属于GCN5超级家族,缺乏保存的催化残留物.
研究的目的:
- 为了描述新型氨基甘油酸乙转移酶ApmA的特征,这是第一个来自左手β螺旋超级家族的报告.
- 阐明ApmA介导的氨基糖化物耐药性的分子机制.
- 将ApmA的机制与其他AAC和左手β螺旋酶进行比较.
主要方法:
- 生物化学测试以确定酶活性和基质特异性.
- 结构分析以了解活动站点架构.
- 与已知的aminoglycoside乙转移酶和左手β螺旋酶进行比较分析.
主要成果:
- ApmA 赋予了广泛的氨基糖化物耐药性.
- ApmA的催化机制与其他排毒左手β螺旋酶和GCN5 AAC显著不同.
- 在ApmA中活性部位的histidine表现出基质依赖的功能灵活性.
结论:
- ApmA代表了一种具有独特催化机制的新型氨基糖化物耐药酶类.
- 抗生素耐药性元素的可塑性是由ApmA在药物排毒中选择蛋白质催化剂的能力证明的.
- 了解ApmA的机制可以了解抗生素耐药性的演变.
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