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Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...
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Bacterial conjugation is a mechanism of horizontal gene transfer that enables the exchange of genetic material between bacterial cells through direct contact. This process is facilitated by a donor cell carrying a conjugative plasmid, which encodes genes necessary for pilus formation, DNA replication, and transfer. The conjugative plasmid plays a central role in initiating and executing the transfer of genetic material.The tra region of the conjugative plasmid encodes proteins responsible for...
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从大肠杆菌在I-E级联中识别杂交PAM的结构基础

Robert P Hayes1, Yibei Xiao1, Fran Ding1

  • 1Department of Molecular Biology and Genetics, Cornell University, 253 Biotechnology Building, Ithaca, New York 14853, USA.

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|February 11, 2016
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CRISPR-Cas免疫系统使用 Cascade 结合外来 DNA,通过小沟相互作用识别 PAM 序列. 这种结合启动了DNA解和R循环形成,这对 prokaryotic 对入侵者的防御至关重要.

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科学领域:

  • 分子生物学
  • 结构生物学
  • 微生物学

背景情况:

  • Prokaryotic 适应性免疫依赖于 CRISPR-Cas 系统来防御外来遗传元素.
  • I型的CRISPR系统,包括Cascade和Cas3,在基因调节中普遍使用.
  • 级联促进了crRNA引导的DNA向,导致R循环的形成和随后的DNA降解.

研究的目的:

  • 通过I型CRISPR-Cas系统阐明目标DNA识别和R循环形成的结构机制.
  • 提供关于大肠杆菌和外来双链DNA相互作用的原子层次见解.

主要方法:

  • 使用X射线结晶学以2.45 Å分辨率确定结合异物DNA的大肠杆菌结构.

主要成果:

  • 通过Cascade Cse1子单元的微小沟相互作用来识别5'-ATG原体空间器相邻动图 (PAM).
  • 细小的DNA沟识别解释了布的多个PAM序列的结合能力.
  • PAM识别触发了DNA解和定向R循环形成,非目标链被Cse2二次体稳定.

结论:

  • 这项研究揭示了CRISPR-Cas免疫中PAM依赖的定向R循环形成的结构基础.
  • 了解这些结构动态是理解 prokaryotic 防御机制和生物技术应用的关键.