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相关概念视频

Protein Complexes with Interchangeable Parts01:57

Protein Complexes with Interchangeable Parts

2.5K
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.
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order...
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Cytoskeletal Proteins in Bacteria01:29

Cytoskeletal Proteins in Bacteria

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Bacterial cells were initially considered simple, randomly organized structures lacking a cytoskeleton. However, the discovery of cytoskeleton homologs in bacteria led to the change of this opinion. Bacterial cytoskeletal filaments regulate the cell shape, cell polarity, cell division, and partitioning of plasmids during cell division. It was later discovered that bacterial cytoskeletal proteins, mainly actin and tubulin homologs, are diverse compared to their eukaryotic counterparts. On the...
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Protein Translocation Machinery on the ER Membrane01:28

Protein Translocation Machinery on the ER Membrane

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The translocon complex situated on the ER membrane is the main gateway for the protein secretory pathway. It facilitates the transport of nascent peptides into the ER lumen and their insertion into the ER membrane.
Sec61 protein conducting channel
In eukaryotes, the translocon complex comprises a core heterotrimeric translocator channel called the Sec61 complex. This channel includes three transmembrane proteins, Sec61α, Sec61β, and Sec61γ, and is the largest subunit of the...
4.4K
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...
10.5K
Prokaryotic Cells01:28

Prokaryotic Cells

34.4K
Prokaryotes are small unicellular organisms that include the domains — Archaea and Bacteria. Bacteria include many common microorganisms, such as Salmonella and E. coli, while the Archaea include extremophiles that live in harsh environments, such as volcanic springs.
Like eukaryotic cells, all prokaryotic cells are surrounded by a plasma membrane, have genetic material in the form of single, circular DNA, a cytoplasm that fills the interior of the cell, and ribosomes that synthesize...
34.4K
Eukaryotic Compartmentalization01:37

Eukaryotic Compartmentalization

10.4K
One of the distinguishing features of eukaryotic cells is that they contain membrane-bound organelles, such as the nucleus and mitochondria, that carry out specialized functions. Since biological membranes are only selectively permeable to solutes, they help create a compartment with controlled conditions inside an organelle. These microenvironments are tailored to the organelle's specific functions and help isolate them from the surrounding cytosol.
For example, lysosomes in the animal...
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相关实验视频

Updated: May 27, 2025

Monitoring the Assembly of a Secreted Bacterial Virulence Factor Using Site-specific Crosslinking
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Monitoring the Assembly of a Secreted Bacterial Virulence Factor Using Site-specific Crosslinking

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将细菌微分区外蛋白与遗传编码的冷凝物交接起来.

Michele Costantino1, Eric J Young2,3, Abesh Banerjee1

  • 1School of Molecular Sciences, Arizona State University, Tempe, Arizona, USA.

Protein science : a publication of the Protein Society
|February 19, 2025
PubMed
概括
此摘要是机器生成的。

细菌微分区 (BMC-H) 蛋白覆盖合成蛋白质凝聚物,形成稳定可控制的分区. 这一进步为设计具有可调节性质的合成细胞和器官提供了一种新方法.

关键词:
细菌微部件中的细菌微部件.分类 分类 分类 分类 分类.液态液态相隔离的方法自动组装的自动组装机合成生物学 合成生物学

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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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Identification of Protein Complexes in Escherichia coli using Sequential Peptide Affinity Purification in Combination with Tandem Mass Spectrometry
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Identification of Protein Complexes in Escherichia coli using Sequential Peptide Affinity Purification in Combination with Tandem Mass Spectrometry

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相关实验视频

Last Updated: May 27, 2025

Monitoring the Assembly of a Secreted Bacterial Virulence Factor Using Site-specific Crosslinking
11:33

Monitoring the Assembly of a Secreted Bacterial Virulence Factor Using Site-specific Crosslinking

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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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Identification of Protein Complexes in Escherichia coli using Sequential Peptide Affinity Purification in Combination with Tandem Mass Spectrometry
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Identification of Protein Complexes in Escherichia coli using Sequential Peptide Affinity Purification in Combination with Tandem Mass Spectrometry

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科学领域:

  • 生物化学 生物化学
  • 合成生物学 合成生物学
  • 生物物理学的生物物理.

背景情况:

  • 液-液相分离 (LLPS) 驱动细胞凝结物的形成,这对合成细胞发育至关重要.
  • 众所周知,细菌微分区 (BMC) 蛋白形成了强大的蛋白质结构.

研究的目的:

  • 为了研究BMC-H蛋白在LLPS驱动的蛋白质凝聚物的组装.
  • 设计BMC-H变种用于凝结物的表面涂层.
  • 评估这些涂层冷凝剂的稳定性和功能性质,用于合成生物学应用.

主要方法:

  • 利用由协同RGG-RGG域形成的工程蛋白质凝聚物.
  • 工程 BMC-H 变种与 RGG 截断合并,以促进表面组装.
  • 研究了pH和蛋白质度对涂层形成的影响.
  • 评估了凝聚液凝聚,稳定性和选择性蛋白质结合 (例如TEV蛋白酶).

主要成果:

  • 工程 BMC-H 变种,特别是 BMC-H-T2,在 RGG-RGG 水滴上形成了稳定的表面涂层.
  • 这些涂层防止了滴滴凝聚,并且稳定,不会与稀释阶段交换.
  • 涂层滴滴选择性地隔离了折叠的蛋白质,如TEV蛋白酶.
  • TEV蛋白酶降解了RGG-RGG核心,但没有降解BMC-H涂层,证明了涂层的完整性.

结论:

  • 贝蛋白质涂层的BMC蛋白质凝聚物是完全可编码的,可以精确控制LLPS区间.
  • 该系统为构建功能合成器官和细胞提供了一个新的平台.
  • 形成稳定,选择性涂层的能力为先进的生物分子工程开辟了道路.