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相关概念视频

Regulation of Nuclear Protein Sorting01:45

Regulation of Nuclear Protein Sorting

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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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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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Nuclear Localization Signals and Import01:46

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Proteins targeted to the nucleus carry short stretches of amino acid sequences called the nuclear localization signal or NLS. Classical nuclear localization signals are of two types: monopartite and bipartite NLS. Monopartite classical NLS (cNLS) consists of a single cluster of 4-8 amino acids. Bipartite cNLS consists of two clusters of  2-3 amino acids and a 9-12 residue long proline-rich linker bridging the two clusters. Signal clusters are rich in positively charged amino acids such as...
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Phosphoinositides and PIPs01:42

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Phosphoinositides are a group of phospholipids containing a glycerol backbone with two fatty acid chains and a phosphate attached to a myoinositol sugar ring. The inositol head group extends into the cytoplasm, where it is modified by adding phosphate groups to form phosphatidylinositol phosphates or PIPs.
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Nuclear Protein Sorting01:34

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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.
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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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相关实验视频

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A Pipeline to Investigate the Structures and Signaling Pathways of Sphingosine 1-Phosphate Receptors
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SF-1 诱导了核 PIP2 的产生

Ethan S Chi1, Elizabeth A Stivison1, Raymond D Blind1

  • 1Department of Medicine, Division of Diabetes, Endocrinology and Metabolism, Vanderbilt University Medical Center, Nashville, TN 37232, USA.

Biomolecules
|October 28, 2023
PubMed
概括
此摘要是机器生成的。

这项研究表明,在细胞中表达类固醇原因子-1 (SF-1) 会增加脂质酸丁酸4,5-双酸盐 (PIP2) 的核水平. 这种核PIP2积累取决于SF-1结合PIP2的能力.

关键词:
在 Ad4BP 中使用.伊诺西聚酸盐多基因酶 IPMKK在NR5A中,它是NR5A.非膜核脂质的非膜核脂质

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Author Spotlight: Comprehensive Epigenetic Analysis for Investigating Human Cellular Plasticity and Environmental Adaptation Using Immunofluorescence Assays
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A Direct Force Probe for Measuring Mechanical Integration Between the Nucleus and the Cytoskeleton
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A Direct Force Probe for Measuring Mechanical Integration Between the Nucleus and the Cytoskeleton
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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
  • 生物化学 生物化学

背景情况:

  • 甲动物细胞核含有酸丁酸4,5-双酸盐 (PIP2),一种脂质,其存在于水性核质中尚不清楚.
  • 类固醇原因子-1 (SF-1) 是一种已知在体外结合PIP2的核受体,结构数据表明它可以溶解脂质.

研究的目的:

  • 提供细胞证据,证明SF-1表达与核PIP2积累有关.
  • 调查SF-1可能影响核PIP2水平的机制.

主要方法:

  • 使用了可诱导四环素的HEK细胞系,表达野生型SF-1或缺乏PIP2结合的SF-1突变.
  • 针对PIP2和PI{3,4,5) P3 (PIP3) 的抗体用于免疫光检测脂质局部化.
  • 同定位的PIP2信号与FLAG标记的SF-1来确认核关联.

主要成果:

  • 野生型SF-1的四环素诱导导致可检测的核信号与PIP2抗体交叉反应,但不是PIP3抗体.
  • 诱导的核PIP2信号与FLAG标记的SF-1共同定位.
  • 诱导一种缺乏PIP2结合的SF-1突变体并没有导致可检测的核PIP2信号,尽管蛋白质表达水平相似.

结论:

  • SF-1的表达与人体细胞中核PIP2水平的增加有关.
  • 这些发现支持了SF-1结合并可能溶解核PIP2的假设,为之前观察到的生物化学和结构数据提供了细胞证据.