为了通过Candida glabrata Pdr1转录因子进行转录激活,需要重叠的协激活器功能
Thomas P Conway1, Lucia Simonicova1, W Scott Moye-Rowley1
1Department of Molecular Physiology and Biophysics, Carver College of Medicine, University of Iowa, Iowa City, IA 52242, USA.
在Pdr1转录因子中获得功能的突变驱动了Candida glabrata中的醇耐药性. SWI/SNF和SAGA复合体是Pdr1-介导基因转录的必不可少的联合激活剂,对抗性至关重要.
科学领域:
- 分子生物学分子生物学
- 医学真菌学 医学真菌学
- 抗微生物耐药性 抗微生物耐药性
背景情况:
- 在 *Candida glabrata* 中的亚醇耐药性是一个日益严重的临床问题.
- 这种抗性通常与Pdr1转录因子的功效获取 (GOF) 突变有关.
- GOF Pdr1 变异导致像*CDR1*这样的基因过度表达,从而产生对可纳的耐药性.
研究的目的:
- 阐明GOF Pdr1变异增强目标基因转录的分子机制.
- 识别与野生类型和GOF Pdr1.1相互作用的协作激活蛋白.
主要方法:
- 对Pdr1 (野生型和GOF变体) 进行并列亲和性净化,以识别相互作用的蛋白质.
- 使用删除突变物和条件降解系统对协活性剂功能的分析.
- 评估Pdr1依赖转录和PDR1*自调的情况.
主要成果:
- 确定了SWI/SNF复合体 (Snf2) 和SAGA复合体 (Spt7,Ngg1) 作为Pdr1联合激活剂.
- 对SNF2或SPT7的损失导致了Pdr1-依赖转录的受损.
- 同时耗尽SWI/SNF和SAGA严重破坏了*PDR1*自我调节.
结论:
- SWI/SNF和SAGA复合体是Pdr1功能的关键联合激活剂.
- 这些复合体协作驱动Pdr1目标基因的高水平转录,包括PDR1本身.
- 了解这些相互作用可能会揭示新的策略来打击Candida glabrata中的醇耐药性.
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