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Related Concept Videos

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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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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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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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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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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Nuclear transmutation is the conversion of one nuclide into another. It can occur by the radioactive decay of a nucleus, or the reaction of a nucleus with another particle. The first manmade nucleus was produced in Ernest Rutherford’s laboratory in 1919 by a transmutation reaction, the bombardment of one type of nuclei with other nuclei or with neutrons. Rutherford bombarded nitrogen-14 atoms with high-speed α particles from a natural radioactive isotope of radium and observed...
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Single-Molecule Imaging of Nuclear Transport
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Nuclear growth and import can be uncoupled.

Pan Chen1, Sampada Mishra2, Haritha Prabha2

  • 1Department of Biochemistry and Molecular Biology and Zhejiang Key Laboratory of Pathophysiology, School of Basic Medical Sciences, School of Medicine, Ningbo University, Ningbo, Zhejiang 315211, China.

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Nuclear growth is not solely driven by nuclear import. Manipulating chromatin structure, such as DNA fragmentation or histone modification, can decouple nuclear import from nuclear growth, suggesting chromatin

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Area of Science:

  • Cell biology
  • Molecular biology
  • Genetics

Background:

  • Nuclear growth is essential for cell division and function.
  • Importin α/β-mediated nuclear import is a key process for delivering nuclear components.
  • The relationship between nuclear import and nuclear growth is not fully understood.

Purpose of the Study:

  • To investigate the driving forces behind nuclear growth.
  • To determine if nuclear import is the primary factor in nuclear growth.
  • To explore the role of chromatin structure in uncoupling nuclear import and growth.

Main Methods:

  • Studied nuclei assembled in *Xenopus* egg extract.
  • Manipulated chromatin structure using micrococcal nuclease, altered histone methylation/acetylation, and varied DNA content.
  • Assessed nuclear import rates and nuclear growth under different experimental conditions.
  • Observed nuclear bleb expansion and lamin incorporation.

Main Results:

  • Nuclear growth and import can be uncoupled by altering chromatin structure.
  • DNA fragmentation or histone modifications led to reduced nuclear growth despite similar import rates.
  • Increased DNA content resulted in larger nuclei with slower import.
  • Nuclear blebs expanded at sites of high chromatin density and lamin addition.
  • Nuclei lacking DNA showed reduced lamin incorporation.

Conclusions:

  • Nuclear import is necessary but not sufficient to drive nuclear growth.
  • Chromatin structure plays a critical role in regulating nuclear growth.
  • Altered chromatin structure can lead to the uncoupling of nuclear import and growth.