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相关概念视频

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.
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Porin Insertion in the Outer Mitochondrial Membrane01:12

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Porins are beta-barrel proteins translocated to the mitochondrial outer membrane through the TOM complex into the intermembrane space. Porin precursors bind TIM chaperones within the intermembrane space and are guided to the Sorting and Assembly Machinery complex or SAM complex on the outer mitochondrial membrane.
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Assembly of Cytoskeletal Filaments01:18

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Cytoskeletal filaments are polymeric forms of smaller protein subunits. However, individual cytoskeletal filaments may easily disassemble or associate with other similar filaments to form rigid structures. Microfilaments, made of actin monomers, rely on actin-binding proteins to form bundles and create networks of individual actin filaments. Microtubules rely on microtubule-associated proteins (MAPs) to form sturdy cylindrical structures. However, the proteins involved in forming complex...
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Microtubules are dynamic structures that undergo continuous assembly and disassembly. They originate from specialized multi-protein complexes known as microtubule organizing centers or MTOCs. Within the MTOC, the point of origin of the microtubule is known as the minus end, while the end radiating outward is the plus end. Microtubules serve two primary functions — the organization of spindle complexes to separate sister chromatids during mitotic or meiotic cell division and the formation...
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Assembly of Complex Microtubule Structures01:32

Assembly of Complex Microtubule Structures

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Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.
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Structure of Porins

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Mitochondria, chloroplasts, and gram-negative bacteria have transmembrane, beta-barrel proteins called porins to mediate the free diffusion of ions and metabolites across the membrane. Mitochondrial porin precursors contain conserved amino acid sequences called beta signals at their C-terminal. Beta signals have a  motif of PoXGXXHyXHy (Po-Polar, X-Any amino acid, G-Glycine, Hy-LargeHydrophobic), which are crucial for precursor recognition to initiate precursor assembly. Beta-barrel...
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相关实验视频

Updated: Jul 19, 2025

X-Ray Crystallography to Study the Oligomeric State Transition of the Thermotoga maritima M42 Aminopeptidase TmPep1050
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在基底层的结构原理 插入酶复杂组装组件

Ahmed H Hassan1,2, Christian Ihling3,4, Claudio Iacobucci3,4,5

  • 1TU Braunschweig, Institute of Plant Biology, Braunschweig, Germany.

Protein science : a publication of the Protein Society
|August 12, 2023
PubMed
概括
此摘要是机器生成的。

辅因子 (Moco) 的合成需要插酶 (Mo-insertase). 这项研究模拟了真核生物Cnx1复合体,揭示了一个不对称的六合体,该六合体将其G和E域定位为高效的Moco形成.

关键词:
生物合成复杂的复杂生物合成.合因子是合因子的一种.插酶是一种插酶.

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Examining Proteasome Assembly with Recombinant Archaeal Proteasomes and Nondenaturing PAGE: The Case for a Combined Approach
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相关实验视频

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Examining Proteasome Assembly with Recombinant Archaeal Proteasomes and Nondenaturing PAGE: The Case for a Combined Approach
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Analyzing Dynamic Protein Complexes Assembled On and Released From Biolayer Interferometry Biosensor Using Mass Spectrometry and Electron Microscopy
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科学领域:

  • 生物化学 生化学
  • 结构生物学 结构生物学
  • 酶学 是一种酶学.

背景情况:

  • 微量元素 (Mo) 对生物活性至关重要,主要是在酶特异的FeMo辅因子或辅因子 (Moco) 中.
  • 莫科包括一个有机二 (MPT) 成分和一个无机的Mo-center.
  • 插酶 (Mo-insertases) 催化了关键的Mo中心形成,具有独特的G和E域,功能部分不明.

研究的目的:

  • 阐明真核细胞Mo-insertase Cnx1复合体G和E域之间的结构和功能关系.
  • 研究Cnx1复合体的整体结构及其对催化活动的影响.

主要方法:

  • 交联质谱法被用来捕捉Cnx1复合体内的蛋白质-蛋白质相互作用.
  • 使用计算建模,基于交叉链接数据生成结构模型.
  • 分析的重点是真核 Mo-insertase 中的组合和域定向.

主要成果:

  • 成功生成了真核生物Cnx1复合体的结构模型.
  • 发现Cnx1形成了一个不对称的六边形复合体.
  • 六边形结构促进了G和E域活性位点的对齐,使其具有催化生产性的方向.

结论:

  • 在Cnx1的不对称六边形结构是协调辅因子合成的顺序步骤至关重要的.
  • 这种结构安排优化了G域 (MPT腺化) 和E域 (酸盐插入) 活性位点之间的相互作用.
  • 这些发现提供了对在真核生物中插入的机制的关键见解.