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相关概念视频

Bacterial Signaling01:30

Bacterial Signaling

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Bacterial signaling can occur within bacteria (intracellular) or between bacteria (intercellular). At times, a group of bacteria behaves like a community. To achieve this, they engage in quorum sensing, the perception of higher cell density that causes changes in gene expression. Quorum sensing involves both extracellular and intracellular signaling. The signaling cascade starts with a molecule called an autoinducer (AI). Individual bacteria produce AIs that move out of the bacterial cell...
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Protein Complex Assembly02:41

Protein Complex Assembly

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Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
Many viruses self-assemble into a fully functional unit using the infected host cell to...
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Protein Complexes with Interchangeable Parts01:57

Protein Complexes with Interchangeable Parts

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Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
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Ribosomes01:27

Ribosomes

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Ribosomes translate genetic information encoded by messenger RNA (mRNA) into proteins. Both prokaryotic and eukaryotic cells have ribosomes. Cells that synthesize large quantities of protein—such as secretory cells in the human pancreas—can contain millions of ribosomes.
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Ribosomes are composed of ribosomal RNA (rRNA) and proteins. In eukaryotes, rRNA is transcribed from genes in the nucleolus—a part of the nucleus that specializes in ribosome...
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Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

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Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
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Ribosome synthesis is a highly complex and coordinated process involving more than 200 assembly factors. The synthesis and processing of ribosomal components occurs not only in the nucleolus but also in the nucleoplasm and the cytoplasm of eukaryotic cells.
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相关实验视频

Updated: Jun 15, 2025

From a Natural Product to Its Biosynthetic Gene Cluster: A Demonstration Using Polyketomycin from Streptomyces diastatochromogenes Tü6028
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From a Natural Product to Its Biosynthetic Gene Cluster: A Demonstration Using Polyketomycin from Streptomyces diastatochromogenes Tü6028

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在装配线聚基化物生物合成中的模块间通信的结构基础.

Dillon P Cogan1,2, Alexander M Soohoo3, Muyuan Chen4

  • 1Department of Chemistry, Stanford University, Stanford, CA, USA. dcogan@usc.edu.

Nature chemical biology
|August 23, 2024
PubMed
概括
此摘要是机器生成的。

组装线聚基酸合成酶 (PKSs) 是一个模块化的酶. 研究人员使用交叉连接和冷EM研究了它们的域互动,以了解PKS工程的中间传输.

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科学领域:

  • 生物化学 生物化学
  • 结构生物学 结构生物学
  • 合成生物学 合成生物学

背景情况:

  • 组装线聚基合成酶 (PKSs) 是复杂的多酶系统,负责生产各种各样的天然产品.
  • 了解PKS中基质通道和域通信的精确机制对于它们的理性工程至关重要.
  • 对PKS的遗传重编程为创建具有量身定制结构的新型化合物提供了显著的潜力.

研究的目的:

  • 研究 PKS 中的催化域和乙烯载体蛋白 (ACP) 域之间的功能相互作用.
  • 阐明在PKS组装线上选择性基板运输的结构基础.
  • 为混合PKS系统的基于结构的设计提供见解.

主要方法:

  • 使用双功能交叉连接试剂在6-deoxyerythronolide B合成酶内捕获暂时域-域接口.
  • 采用单粒子冷电子显微镜 (cryo-EM) 来解析交联PKS中间体的结构.
  • 应用统计每颗粒图像分析来分析冷EM数据并确定关键相互作用.

主要成果:

  • 发现了合成酶 (KS) 和ACP领域之间的特定相互作用.
  • 证明这些相互作用在模块内和模块间的通信路径之间有区别.
  • 强化了PKS催化循环中形状不对称性的重要性.

结论:

  • 该研究为了解PKS中间运输提供了结构性基础.
  • 确定了关键的域-域相互作用,这些相互作用控制了PKS组装线内的基质通道.
  • 这些发现支持通过组合不同PKS系统的模块来合理设计混合PKS.