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在体外鉴定菌素溶解蛋白MS2-L的特征

Julija Mezhyrova¹, Janosch Martin², Clara Börnsen³

¹Institute of Biophysical Chemistry and Center for Biomolecular Magnetic Resonance, Goethe University, Frankfurt am Main 60438, Germany.

Microbiome research reports

|December 4, 2023

概括

细菌溶解MS2-L在细胞膜内形成大型寡合体复合体,导致细胞包膜病变. 陪伴者DnaJ与MS2-L相互作用,但不会影响其寡合化或溶解机制.

科学领域:

微生物学微生物学
结构生物学结构生物学
生物化学生物化学

背景情况:

MS2-L是一种来自Leviviridae家族的菌体毒素,通过细胞包膜病变调解细菌细胞溶解.
精确的MS2-L诱导溶解机制及其与伴侣DnaJ等细胞因子的相互作用仍然不清楚.
了解MS2-L对于生物工程应用至关重要.

研究的目的:

阐明MS2-L作用的分子机制及其与DnaJ的相互作用.
为了研究MS2-L在插入膜时的寡合化过程.
提供对MS2-L介导的细菌细胞溶解的见解.

主要方法:

结合了体外和体外过度表达的研究.
无细胞合成MS2-L和衍生物,插入纳米光盘或洗剂小粒.
原生液体珠子离子溶解质谱和冷电子显微镜.
光蛋白融合用于E. coli体内的体内监测.

主要成果:

在膜插入后,MS2-L自组装到高寡合状态,主要由其跨膜域指导.
在洗剂环境中阻碍了寡合化,但DnaJ相互作用并没有阻碍.
低温EM显示了外膜的溶解启动,随后是丁糖的破坏和内膜的解体.
MS2-L形成类似于 ΦX174-E 的复合体,在跨膜域中具有寡合体接口.

结论:

MS2-L的寡合化对于其破坏膜和细胞溶解活性至关重要.
跨膜域对MS2-L寡合化和复合体形成至关重要.
菌体毒素的高级组合可能是膜分解和细菌溶解的保存机制.

关键词:

菌体毒素是一种菌体毒素.细胞自由表达的表达.分子组件是分子组件.纳米光盘的使用方法原生质谱法本土质谱法.

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