探索mupirocin耐药性和超耐药性的机制
Igor Zivkovic1, Ita Gruic-Sovulj1
1Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, 10000 Zagreb, Croatia.
Biochemical Society transactions
|June 17, 2024
概括
细菌中的木皮洛辛耐药性通过两种形式的异核糖-tRNA合成酶 (IleRS) 出现. 耐药形式的IleRS2可以发展出高水平的mupirocin耐药性,而超耐药的变种具有独特的结构动机.
科学领域:
- 微生物学 微生物学
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 穆皮罗辛是一种广泛的抗生素,向格拉姆阳性细菌,有效对抗皮肤感染和耐甲西林黄金葡萄球菌 (MRSA) 鼻腔殖民.
- 它通过抑制蛋白质合成通过异氨基酸-tRNA合成酶 (IleRS) 酶起作用,这对于氨基酸的结合至关重要.
- 细菌具有两种不同的IleRS类型:IleRS1 (对mupirocin敏感) 和IleRS2 (对mupirocin耐药),起源于早期的基因重复事件.
研究的目的:
- 调查由IleRS2.2赋予的mupirocin耐药性的结构基础.
- 了解对mupirocin的高水平和高抗性背后的机制.
- 探索IleRS类型的进化分歧及其临床影响.
主要方法:
- 对IleRS1和IleRS2结构及其与mupirocin的相互作用进行比较分析.
- 野生类型和变种IleRS酶的生物化学表征,包括动力分析 (Ki值).
- 检查超耐药IleRS2变体中的催化动机.
主要成果:
- 与IleRS1.1相比,IleRS2的耐药性源于改变的相互作用,特别是与mupirocin的碳酸盐部分的键的损失,与IleRS1相比.
- 最近发现的超耐药IleRS2变种表现出非正规的催化动机 (交换第1位和第3位),对于抵抗而无损害活动至关重要.
- 在临床环境中,mupirocin耐药性是由IleRS1突变 (低水平) 或由等离子体传播的IleRS2 (高水平) 的获得引起的;在临床上尚未观察到超耐药变体.
结论:
- IleRS1和IleRS2的独特进化路径为不同的mupirocin敏感性提供了基础.
- 超耐药IleRS2中非正规的催化动机代表了逃避抗生素抑制的显著适应.
- 了解这些耐药性机制对于管理mupirocin有效性和打击细菌病原体抗生素耐药性至关重要.
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