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相关概念视频

Gram-negative Bacterial Protein Secretion Systems01:17

Gram-negative Bacterial Protein Secretion Systems

61
Gram-negative bacteria utilize sophisticated protein secretion systems to transport proteins across their double-membrane envelope into the extracellular environment or host cells. Based on their mechanism of action, these systems are classified into one-step and two-step pathways.One-Step Secretion Systems (Types I, III, IV, and VI)One-step secretion systems bypass the periplasm entirely, forming a continuous channel that spans both the inner and outer membranes:Type I Secretion System (T1SS):...
61
Bacterial Translocation and Protein Secretion01:26

Bacterial Translocation and Protein Secretion

46
Bacterial protein secretion involves translocation systems to ensure proteins reach their designated locations, including the plasma membrane, periplasm, outer membrane, or the external environment. These translocation systems are vital for bacterial physiology, supporting processes like membrane assembly, enzymatic activity in the periplasm, and interactions with the external environment. The division of labor between Sec and Tat pathways ensures efficiency in handling proteins with diverse...
46
Mechanism of Conjugation01:19

Mechanism of Conjugation

67
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...
67

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相关实验视频

Updated: Aug 5, 2025

Electroporation of Functional Bacterial Effectors into Mammalian Cells
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使用细菌收缩注射系统可编程的蛋白质输送

Joseph Kreitz1,2,3,4,5, Mirco J Friedrich1,2,3,4,5, Akash Guru1,2,3,4,5

  • 1Howard Hughes Medical Institute, Cambridge, MA, USA.

Nature
|March 29, 2023
PubMed
概括

细胞外收缩注射系统 (eCIS) 可以被设计为将蛋白质输入人体细胞. 这一突破为治疗蛋白质和基因编辑应用提供了新的可能性.

更多相关视频

Engineering Cell-permeable Protein
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Directed Protein Packaging within Outer Membrane Vesicles from Escherichia coli: Design, Production and Purification
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Directed Protein Packaging within Outer Membrane Vesicles from Escherichia coli: Design, Production and Purification

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相关实验视频

Last Updated: Aug 5, 2025

Electroporation of Functional Bacterial Effectors into Mammalian Cells
08:39

Electroporation of Functional Bacterial Effectors into Mammalian Cells

Published on: January 19, 2015

10.1K
Engineering Cell-permeable Protein
21:08

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Published on: December 28, 2009

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Directed Protein Packaging within Outer Membrane Vesicles from Escherichia coli: Design, Production and Purification
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科学领域:

  • 微生物学
  • 分子生物学
  • 生物技术

背景情况:

  • 内共生细菌利用复杂的传递系统与宿主细胞相互作用.
  • 细胞外收缩注入系统 (eCIS) 是将蛋白质有效载荷注入真核细胞的宏分子机器.
  • 之前的研究表明,eCIS是针对小鼠细胞的,这表明有治疗应用的潜力.

研究的目的:

  • 调查Photorhabdus毒性磁带 (PVC) eCIS的目标识别机制.
  • 确定PVC eCIS是否可以被设计为针对人类细胞.
  • 评估PVC eCIS在人类细胞中提供各种蛋白质有效载荷的能力.

主要方法:

  • 在PVC尾纤维的结构引导工程中.
  • 在人类细胞中测试PVC eCIS的向和蛋白质传递.
  • 包括Cas9和基编辑器在内的蛋白质有效载荷的分析.

主要成果:

  • 通过其尾纤维通过特定的受体识别来调解PVC eCIS的目标选择.
  • 已成功重新编程PVC eCIS以高效率针对人类细胞和小鼠.
  • 使用工程PVC系统将多种蛋白质有效载荷运送到人体细胞中.

结论:

  • PVC eCIS是可编程的蛋白质输送装置.
  • 在基因疗法,癌症疗法和生物控制中具有应用潜力.
  • 这项研究扩大了细菌注射系统对真核细胞操纵的实用性.