拉索框架中的序列多样性:发现了具有多个氨基酸替代的功能微素J25变体
1Department of Chemical and Biological Engineering, Princeton University, Princeton, New Jersey 08544, USA.
Journal of the American Chemical Society
|March 12, 2011
概括
研究人员为增强功能设计了抗微生物Microcin J25 (MccJ25),是一种抗微生物. 尾部区域的突变产生了强大的变异,而环突变影响了活性,揭示了拉索结构功能关系的洞察力.
科学领域:
- 微生物学 微生物学
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 微信J25 (MccJ25) 是一种通过核糖体合成的抗微生物,具有独特的拉索结构.
- 它在大肠杆菌中的产生涉及四个基因集群 (mcjA,mcjB,mcjC,mcjD) 用于合成,成熟和免疫.
- 该mcjD基因编码出口,提供免疫力MccJ25.
研究的目的:
- 开发一个独立控制MccJ25生产和出口/免疫的系统.
- 选MccJ25的突变性库,以确定功能变异.
- 为了研究MccJ25拉索的结构功能关系.
主要方法:
- 在大肠杆菌中开发了mcjA和mcjD的正交基因表达系统.
- 选了和突变性库,针对MccJ25的环和尾部区域.
- 评估了MccJ25变种对敏感菌株如大肠杆菌和沙门氏菌的抗菌活性.
主要成果:
- 发现了近100种新的MccJ25变体,保留了抗菌功能.
- 确定尾部区域突变通常耐受良好,而环突变显著损害功能.
- 证明受损的环形变体不会被运送到细胞质中.
- 发现了MccJ25变体,对敏感菌株的功效增加了多达5倍.
结论:
- 该研究提供了一个剖析MccJ25生产和免疫力的系统.
- 突变性研究揭示了MccJ25环结构对抗微生物活性和细胞吸收的关键作用.
- 尾部区域的修改可以增强MccJ25的功效,突出拉索折对序列多样性的耐受性.
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