的耐受性通过C-4甲基氧化酶Erg25在生物合成途径中进行道化
Amber R Matha1, Xiaofeng Xie1, Robert J Maier1
1Department of Microbiology, University of Georgia, Athens, Georgia, United States of America.
PLoS genetics
|September 16, 2024
概括
的毒性破坏了真菌醇生物合成,主要向Erg25酶. 在Cryptococcus neoformans中发现的这一发现表明,毒性在物种之间存在一种保存的机制,影响了必需脂质的产生.
科学领域:
- 生物化学 生物化学
- 菌类学 菌类学是指菌类学.
- 毒理学 毒理学 毒理学
背景情况:
- (Ni) 是有毒的,但其主要的细胞标和生物化学反应在很大程度上是未知的.
- 哺乳动物研究将Ni与氧化还原应激,缺氧和癌症联系起来,但特定的分子标是难以捉摸的.
- 了解毒性机制对于预测和减轻其对生命的影响至关重要.
研究的目的:
- 使用真菌模型Cryptococcus neoformans阐明细胞反应和毒性的主要目标.
- 研究埃尔戈斯特生物合成和转录因子Sre1在耐受性中的作用.
- 为了确定对固醇生物合成的影响是否保留在人体细胞中.
主要方法:
- 利用Cryptococcus neoformans作为一个模型生物来研究的毒性.
- 分析了埃尔戈斯特和脂质生物合成途径的改变.
- 研究了固醇调控元素结合转录因子Sre1和ERG25基因的作用.
- 进行了转录组分析,以比较诱导的变化与缺氧.
- 检查了对人类A549肺上皮细胞中的固醇水平的影响.
主要成果:
- 对的暴露改变了C. neoformans中的ergosterol和脂质生物合成.
- 转录因子Sre1对于耐尼克是必不可少的.
- 编码C-4甲基固醇氧化酶的ERG25基因的过度表达,赋予了耐尼克耐受性.
- 突变ERG25的金属结合口袋使真菌对敏感.
- 诱导了埃尔戈斯特生物合成基因中的显著和特定的转录组变化,而不是缺氧.
- 暴露减少了人类肺细胞中的固醇水平,反映了真菌反应.
结论:
- 在真菌中的毒性主要准了固醇生物合成途径,Erg25被确定为关键酶.
- 固醇调节元素结合转录因子Sre1在耐受性中起着至关重要的作用.
- 对固醇生物合成的有害作用在真菌和人体细胞之间得到保留,这表明了基本的生物脆弱性.
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