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Related Concept Videos

The Nucleus01:25

The Nucleus

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The nucleus is a membrane-bound organelle that acts as a control center in a eukaryotic cell. It contains chromosomal DNA, which controls gene expression and precisely regulates the production of proteins within the cell. In contrast, the DNA inside the mitochondria and chloroplast only carries out functions that are specific to those organelles.
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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 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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The nucleolus is the most prominent substructure of the nucleus. When it was first discovered, it was considered to be an isolated organelle that forms fibrils and granules. In 1931, the relationship between the nucleolus and chromosomes was first described by Heitz. He observed that the appearance and size of nucleolus varies depending on the stage of the cell cycle. He also noticed constricted regions on different chromosomes clustered together at definite cell cycle stages. These regions,...
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Quantitative Analysis of Chromatin Proteomes in Disease
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Protein quality control in the nucleus.

Ramon D Jones1, Richard G Gardner1

  • 1Department of Pharmacology, University of Washington, Box 357280, Seattle, WA 98195, USA.

Current Opinion in Cell Biology
|March 26, 2016
PubMed
Summary
This summary is machine-generated.

The nucleus protects genetic material via quality control (QC) pathways. This review focuses on nuclear protein quality control (PQC), a vital process linked to human diseases caused by protein misfolding.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • The nucleus houses the eukaryotic cell's genetic blueprint, necessitating robust protective mechanisms.
  • Multiple quality control (QC) pathways ensure DNA integrity, replication fidelity, and accurate transcription into mRNA.
  • While DNA and RNA QC are well-studied, nuclear protein quality control (PQC) remains less understood.

Purpose of the Study:

  • To review the current understanding of nuclear protein quality control (PQC) mechanisms.
  • To highlight emerging questions and recent developments in nuclear PQC research.
  • To underscore the link between nuclear PQC dysfunction and human diseases.

Main Methods:

  • Literature review of existing research on nuclear QC pathways.
  • Synthesis of current knowledge regarding nuclear protein folding and degradation.
  • Identification of knowledge gaps and future research directions in nuclear PQC.

Main Results:

  • Nuclear QC pathways maintain DNA integrity, replication fidelity, and mRNA transcription.
  • Protein misfolding in the nucleus is implicated in numerous human diseases.
  • Significant gaps exist in our understanding of nuclear PQC, particularly concerning protein folding and clearance.

Conclusions:

  • Nuclear PQC is crucial for cellular survival and function, despite being understudied.
  • Further research into nuclear PQC is essential for understanding and treating diseases linked to protein misfolding.
  • Recent advancements are beginning to illuminate the complexities of nuclear PQC.