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相关概念视频

Replication in Prokaryotes02:35

Replication in Prokaryotes

Overview
Molecular Chaperones and Protein Folding03:00

Molecular Chaperones and Protein Folding

The native conformation of a protein is formed by interactions between the side chains of its constituent amino acids. When the amino acids cannot form these interactions, the protein cannot fold by itself and needs chaperones. Notably, chaperones do not relay any additional information required for the folding of polypeptides; the native conformation of a protein is determined solely by its amino acid sequence. Chaperones catalyze protein folding without being a part of the folded protein.
The...
Replication in Prokaryotes01:32

Replication in Prokaryotes

DNA replication has three main steps: initiation, elongation, and termination. Replication in prokaryotes begins when initiator proteins bind to the single origin of replication (ori) on the cell's circular chromosome. Replication then proceeds around the entire circle of the chromosome in each direction from the two replication forks, resulting in two DNA molecules.
Many Proteins Work Together to Replicate the Chromosome
Replication is coordinated and carried out by a host of specialized...
Bacterial Protein Maturation01:26

Bacterial Protein Maturation

Bacterial protein maturation is a tightly regulated process that ensures newly synthesized polypeptides achieve correct functional conformations. This maturation involves a series of modifications, folding events, and quality control steps, often assisted by specialized chaperone proteins.N-Terminal ModificationsThe maturation of bacterial polypeptides begins cotranslationally as the polypeptide exits the ribosome. The first amino acid, N-formylmethionine (fMet), is typically modified at the...
Gene Regulation During Sporulation01:17

Gene Regulation During Sporulation

Sporulation is a complex developmental process that allows certain Gram-positive bacteria, such as Bacillus subtilis and Clostridium species, to survive extreme environmental conditions. This process is tightly regulated by a series of signaling cascades and transcriptional controls, ensuring the formation of a highly resistant endospore.Sporulation is triggered by unfavorable conditions, such as nutrient depletion, and is governed by a phosphorelay system. One of the sensor kinases, such as...
Other Stress Responses in Bacteria01:30

Other Stress Responses in Bacteria

Bacteria have global regulatory systems that control several types of stress mechanisms. These include Pho regulon and the heat shock response, which are essential systems for environmental adaptation, such as nutrient limitation and proteotoxic stress. The Pho regulon and the heat shock response exemplify bacterial resilience, enabling rapid adaptation to fluctuating environmental conditions.Pho RegulonBacteria require phosphorus for essential cellular processes, including nucleic acid...

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相关实验视频

Updated: Jul 6, 2026

Detection of the pH-dependent Activity of Escherichia coli Chaperone HdeB In Vitro and In Vivo
08:32

Detection of the pH-dependent Activity of Escherichia coli Chaperone HdeB In Vitro and In Vivo

Published on: October 23, 2016

通过细菌Hsp70的多流:DnaK与触发因子合作,在指导新生的链中担任监护人.

S A Teter1, W A Houry, D Ang

  • 1Max-Planck-Institut für Biochemie, Department of Cellular Biochemistry, Martinsried, Germany.

Cell
|June 25, 1999
PubMed
概括
此摘要是机器生成的。

大型大肠杆菌Hsp70,DnaK通过与新生多结合,协助新蛋白折叠. 联合删除DnaK和触发因子基因是致命的,这表明蛋白质折叠中的重叠功能.

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Detection of the pH-dependent Activity of Escherichia coli Chaperone HdeB In Vitro and In Vivo
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科学领域:

  • 分子生物学分子生物学
  • 蛋白质折叠 蛋白质的折叠
  • 细菌生理学 细菌生理学

背景情况:

  • 在非压力条件下的新蛋白折叠中,大肠杆菌Hsp70 (DnaK) 的作用尚不清楚.
  • 触发因子是大肠杆菌中与核糖体相关的伴侣,在早期蛋白质折叠中起着已知的作用.

研究的目的:

  • 调查DnaK在E. coli中新蛋白折叠过程中陪伴新生多的参与.
  • 阐明DnaK与触发因子之间在维持细胞活力的功能关系和潜在重叠.

主要方法:

  • 使用免疫沉试验检测DnaK和新生多之间的相互作用.
  • 为DnaK和触发因子基因生成单个和双重删除突变.
  • 在正常条件下对产生的突变菌进行了细菌生长和生存能力的评估.

主要成果:

  • 在非压力条件下,DnaK被发现暂时与各种新合成的蛋白质结合,特别是那些大于30kDa的蛋白质.
  • 触发因子基因的删除导致DnaK与新生多的关联显著增加 (翻一番).
  • 在标准生长条件下,同时删除DnaK和触发因子基因导致大肠杆菌的致命性.

结论:

  • 即使在没有压力的情况下,DnaK也在新生多的de novo折叠中发挥着重要作用.
  • DnaK和触发因子在蛋白质折叠中具有重要的,部分重叠的功能.
  • 观察到的重叠功能解释了之前提到的大肠杆菌对单独失去DnaK或触发因子的耐受性.