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相关概念视频

Nuclear Protein Sorting01:34

Nuclear Protein Sorting

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Nuclear protein sorting is the selective trafficking of histones, polymerases, gene regulatory proteins into the nucleus and exporting RNAs and ribosomes to the cytosol. It is a tightly controlled process that regulates gene expression within a cell.
Proteins targeted to the nucleus carry nuclear localization signals or NLS recognized by import receptors in the cytosol. Similarly, proteins with nuclear export signals are recognized by export receptors. Import and export receptors are...
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Regulation of Nuclear Protein Sorting01:45

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Nuclear protein sorting regulates nucleus composition and gene expression, crucial for determining the fate of a eukaryotic cell. Hence, the entry and exit of molecules across the nuclear envelope is a tightly controlled process. Nuclear protein sorting can be inhibited by one of the following ways: 1) masking cargo signal sequences, 2) modifying the nuclear receptor's affinity for cargo, 3) controlling the nuclear pore size, 4) retaining the cargo during its transit to the cytosol or the...
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Ras-related nuclear protein or Ran is a small G protein that cycles between its GTP and GDP bound states. Ran specific regulators, a Ran GTPase Activating Protein or RanGAP present in the cytosol and a Ran guanine nucleotide exchange factor or RanGEF present inside the nucleus regulate GTP/GDP exchange. A high concentration of GTP inside the cells, in addition to this asymmetric distribution of  Ran-specific regulators, leads to a higher RanGTP concentration inside the nucleus. This...
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Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...
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Nuclear Export01:42

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The nucleus restricts several proteins within and allows others to pass. The restricted proteins possess a nuclear retention sequence or NRS, anchoring them to the nuclear lamins and preventing their transport to the cytosol. The non-restricted proteins, after their synthesis, are transported to their site of action, such as the cytosol or other organelles, with the help of nuclear export signals or NES.
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相关实验视频

Updated: Jan 16, 2026

Single-Molecule Imaging of Nuclear Transport
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在核孔中的分子拥挤.

Masahiro Kumeta1,2

  • 1Graduate School of Biostudies, Kyoto University, Kyoto, Japan. kumeta@lif.kyoto-u.ac.jp.

Sub-cellular biochemistry
|September 26, 2025
PubMed
概括
此摘要是机器生成的。

核孔通过拥挤的通道控制分子流量. 最近的发现表明,孔隙成分和运输分子的相位分离是这种选择性屏障功能的关键.

关键词:
联邦政府-Nupup.水凝是一种水凝.卡里奥菲林是什么意思 卡里奥菲林是什么意思国家电力公司 (NPC) 是国家电力公司 (NPC).核孔复合体是一个核孔复合体.核运输是核运输的一种方式.核聚胺是一种核聚胺.努普努普努普 努普努普 努普努普

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科学领域:

  • 细胞生物学 细胞生物学
  • 分子生物学分子生物学
  • 生物物理学的生物物理.

背景情况:

  • 核孔对于核细胞质运输至关重要,调节核和细胞质之间的分子流量.
  • 核孔的中央通道作为选择性屏障,由于一个高度拥挤,内在无序的区域.
  • 最近的研究强调了核孔组件和运输分子的相分离特性.

研究的目的:

  • 审查核细胞质运输系统和核孔复合物的组成.
  • 详细介绍最近关于核孔和运输分子特征的研究.
  • 引入影响分子拥挤屏障功能的因素.

主要方法:

  • 关于核细胞质运输的文献综述.
  • 核孔复合物的组成和功能的分析.
  • 对核孔中的分子拥挤和相分离研究的审查.

主要成果:

  • 核孔通过选择性透性屏障促进了大量的分子流量 (约1000个分子/秒).
  • 屏障是由核孔通道内的拥挤,内在无序的区域形成的.
  • 疏水孔子单位和灵活的运输分子的相分离似乎是一个基本的机制.

结论:

  • 阶段分离被认为是核毛孔复合体功能的基本机制.
  • 了解这些机制对于理解细胞通信和调节至关重要.
  • 影响分子拥挤屏障适应性的因素对细胞过程很重要.