定量蛋白质组学揭示了TA2.A1微空气化学定位培养物中氧气诱导的适应
Samuel I de Jong1, Martijn Wissink1, Kadir Yildirim1
1Department of Biotechnology, Delft University of Technology, Delft, Netherlands.
Frontiers in microbiology
|November 12, 2024
概括
在不同氧气水平下研究了Caldalkalibacillus thermarum呼吸链调节. 意想不到的是,关键酶保持不变,特定的氧化酶和转运体显示出独特的依赖氧气的丰度变化.
科学领域:
- 微生物学 微生物学
- 生物化学 生物化学
- 分子生物学分子生物学
背景情况:
- * Caldalkalibacillus thermarum是一种热性菌体,具有复杂的呼吸链.
- * 这种呼吸链支持各种溶解氧度的生长.
- *了解呼吸链调节是其适应的关键.
研究的目的:
- * 为了研究C. thermarum中呼吸链的调节.
- * 分析不同氧气水平对酶表达的影响.
主要方法:
- * 在化学定位生物反应器中培养C. thermarum.
- *受控暴露于一系列的氧气水平 (0.25%4.2%O2).
- *蛋白质组分析以量化蛋白质丰富度.
主要成果:
- *发现I型和II型NADH脱酶都是构成性的.
- * 细胞染色体c:oxygen aa3氧化酶的丰度随着更高的氧气 (4.2% O2) 增加.
- * 细胞染色体c:oxygen ba3氧化酶在较低氧气水平时更丰富,但降低到0.42%O2.2%以下.
- * 在低氧水平下,-质子反载体MRP复合体的下调.
- *出乎意料的是,没有检测到细胞染色体c:oxygen bb3和menaquinol:oxygen bd复合体.
结论:
- * C. thermarum 对氧气可用性表现出终端氧化酶的特定调节反应.
- * 在低氧气下MRP的下调可以通过:乙酸盐出口商来补偿.
- * 这表明在氧气限制下,稳态具有独特的适应策略.
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