雅塔基米辛生物合成需要两个脱氧核糖核酶来实现毒素自我抵抗
Jonathan Dorival1, Hua Yuan2, Allison S Walker1,3
1Department of Biological Sciences, Vanderbilt University Nashville Tennessee USA brandt.eichman@vanderbilt.edu.
RSC chemical biology
|December 9, 2024
概括
雅塔基米辛 (YTM) 耐药性涉及DNA修复. YtkR4和YtkR5酶修复YTM造成的DNA损伤,确保宿主生存和天然产品生物合成. 这些酶也可能提供替代修复途径.
科学领域:
- 分子生物学分子生物学
- 生物化学 生物化学
- 遗传学 遗传学 是一个
背景情况:
- 雅塔基 (YTM) 是一种强大的破坏DNA的天然产品,具有抗微生物和抗瘤活性.
- YTM生物合成基因集群包括自我抵抗基因,如ytkR2,它编码了一个DNA糖酶,对于切除YTM-腺因病变至关重要.
研究的目的:
- 为了识别和描述负责修复YTM诱导的DNA损伤产生的apurinic/apyrimidinic (AP) 位点的基因.
- 阐明YtkR4和YtkR5在基切除修复 (BER) 途径中的作用以及潜在的替代DNA修复机制.
主要方法:
- 基因鉴定和表征 (ytkR4,ytkR5).
- 对YtkR4和YtkR5 (AP内核酶,3'-5'外核酶) 的净化和酶活性测定.
- 在天然产品基因集群中分析YtkR4和YtkR5同类.
主要成果:
- 确定YtkR4和YtkR5对于YTM生产至关重要,并编码脱氧核糖核酶.
- 纯化的YtkR4和YtkR5显示了针对YtkR2生成的AP位点的AP内核酶活性,支持BER通路.
- YtkR4和YtkR5也具有3'-5'外核酶活性,YtkR5能够消化YTM-DNA损伤,这表明了其他修复机制.
- ytkR4和ytkR5的同类物经常在与天然产品生物合成相关的基因集群中发现.
结论:
- YtkR4和YtkR5是YTM诱导损伤的DNA修复途径的关键组成部分,与YtkR2.2协同工作.
- YtkR4和YtkR5的双重酶活性凸显了它们在维护基因组完整性对抗基因毒性天然产品方面的重要性.
- 这些修复基因的共同进化和聚类表明,它们在生物合成和其他破坏DNA的自然产品的耐药性方面发挥了更广泛的作用.
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