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Related Concept Videos

The Nucleolus02:55

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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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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 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 eukaryotic nucleus is a double membrane-bound organelle that contains nearly all of the cell’s genetic material in the form of chromosomes. It is rightly called the “brain” of the cell as it shoulders the responsibility of responding to various physiological processes, stress, altered metabolic conditions, and other cellular signals. 
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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 nucleoid represents a structurally and functionally distinct region within prokaryotic cells, where the cell's DNA and associated proteins are housed. Unlike eukaryotic cells, prokaryotes lack a membrane-bound nucleus, and the nucleoid facilitates the organization and accessibility of the genetic material within this constraint. The DNA in most bacteria and archaea exists as a single, circular, double-stranded molecule that is highly compacted through supercoiling and interactions with...
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Related Experiment Video

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Laser Micro-Irradiation to Study DNA Recruitment During S Phase
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Structural and Functional Insight into Proliferating Cell Nuclear Antigen.

So Young Park1,2, Mi Suk Jeong1, Chang Woo Han1

  • 1Department of Molecular Biology, College of Natural Sciences, Pusan National University, Busan 46241, Republic of Korea.

Journal of Microbiology and Biotechnology
|December 25, 2015
PubMed
Summary
This summary is machine-generated.

Proliferating cell nuclear antigen (PCNA) is vital for DNA replication, repair, and recombination. Understanding PCNA structure, function, and protein interactions aids in developing new cancer therapies.

Keywords:
DNAPCNAfunctioninteractionstructure

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Structural Biology

Background:

  • Proliferating cell nuclear antigen (PCNA) is a key eukaryotic protein essential for DNA replication, repair, and recombination.
  • PCNA forms a toroidal structure of three monomers that encircles double-stranded DNA.
  • PCNA's diverse functions are modulated by interactions with partner proteins, often through a conserved PCNA-interacting peptide (PIP) motif.

Purpose of the Study:

  • To review the structural characteristics, functions, and post-translational modifications of eukaryotic PCNA.
  • To explore the mechanisms of PCNA interaction with its partner proteins.
  • To highlight the significance of PCNA structural and biochemical studies for therapeutic agent design and anticancer drug development.

Main Methods:

  • Literature review of structural and biochemical studies on PCNA.
  • Analysis of PCNA structure, function, and protein-binding interfaces.
  • Summary of post-translational modifications affecting PCNA activity.

Main Results:

  • PCNA's structure facilitates its role in DNA processing.
  • The PCNA-interacting peptide (PIP) motif mediates interactions with partner proteins.
  • Post-translational modifications significantly regulate PCNA function and protein binding.

Conclusions:

  • Structural and functional insights into PCNA are crucial for understanding DNA processing.
  • PCNA-protein interactions and modifications offer potential targets for therapeutic interventions.
  • Further research on PCNA is valuable for advancing anticancer drug development.