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Related Concept Videos

The Replisome03:01

The Replisome

DNA replication is carried out by a large complex of proteins that act in a coordinated matter to achieve high-fidelity DNA replication. Together this complex is known as the DNA replication machinery or the replisome.
The synthesis of the leading and lagging strands is a highly coordinated process. To explain this, the “Trombone model” was proposed by Bruce Alberts in 1980. The DNA loop formation starts when a primer is synthesized on the parent lagging strand. The loop grows with the...
The Replisome03:01

The Replisome

DNA replication is carried out by a large complex of proteins that act in a coordinated matter to achieve high-fidelity DNA replication. Together this complex is known as the DNA replication machinery or the replisome.
The synthesis of the leading and lagging strands is a highly coordinated process. To explain this, the “Trombone model” was proposed by Bruce Alberts in 1980. The DNA loop formation starts when a primer is synthesized on the parent lagging strand. The loop grows with the...
Eukaryotic RNA Polymerases00:58

Eukaryotic RNA Polymerases

RNA Polymerase (RNAP) is conserved in all animals, with bacterial, archaeal, and eukaryotic RNAPs sharing significant sequence, structural, and functional similarities. Among the three eukaryotic RNAPs, RNA Polymerase II is most similar to bacterial RNAP in terms of both structural organization and folding topologies of the enzyme subunits. However, these similarities are not reflected in their mechanism of action.
All three eukaryotic RNAPs require specific transcription factors, of which the...
Eukaryotic RNA Polymerases00:58

Eukaryotic RNA Polymerases

RNA Polymerase (RNAP) is conserved in all animals, with bacterial, archaeal, and eukaryotic RNAPs sharing significant sequence, structural, and functional similarities. Among the three eukaryotic RNAPs, RNA Polymerase II is most similar to bacterial RNAP in terms of both structural organization and folding topologies of the enzyme subunits. However, these similarities are not reflected in their mechanism of action.
All three eukaryotic RNAPs require specific transcription factors, of which the...
Nuclear Export of mRNA02:31

Nuclear Export of mRNA

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...
Biosynthesis of Nucleic Acids01:28

Biosynthesis of Nucleic Acids

Nucleic acid biosynthesis is a fundamental biochemical process that produces the purine and pyrimidine nucleotides essential for DNA and RNA synthesis. This pathway maintains a balanced nucleotide pool, preventing imbalances that could jeopardize genetic integrity and cellular function. Given the crucial role of nucleotides, their synthesis is tightly regulated to ensure proper cellular homeostasis.Purine BiosynthesisThe biosynthesis of purine nucleotides begins with ribose-5-phosphate, a...

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Related Experiment Video

Updated: May 11, 2026

Laser Microirradiation to Study In Vivo Cellular Responses to Simple and Complex DNA Damage
10:44

Laser Microirradiation to Study In Vivo Cellular Responses to Simple and Complex DNA Damage

Published on: January 31, 2018

Poly-ADP-ribose polymerase: machinery for nuclear processes.

Colin Thomas1, Alexei V Tulin

  • 1Fox Chase Cancer Center, Philadelphia, PA 19111, USA.

Molecular Aspects of Medicine
|April 30, 2013
PubMed
Summary

Poly(ADP-ribose) polymerase 1 (PARP1) is crucial for DNA repair and gene expression. This review details how PARP1 activity regulates nuclear processes through protein shuttling and poly-ADP-ribose matrix formation.

Keywords:
ChromatinHistonesNucleosomePARP1PargPoly(ADP-ribose)

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Last Updated: May 11, 2026

Laser Microirradiation to Study In Vivo Cellular Responses to Simple and Complex DNA Damage
10:44

Laser Microirradiation to Study In Vivo Cellular Responses to Simple and Complex DNA Damage

Published on: January 31, 2018

Artificial RNA Polymerase II Elongation Complexes for Dissecting Co-transcriptional RNA Processing Events
10:59

Artificial RNA Polymerase II Elongation Complexes for Dissecting Co-transcriptional RNA Processing Events

Published on: May 13, 2019

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Poly(ADP-ribose) polymerase 1 (PARP1) is a key nuclear protein involved in numerous cellular functions.
  • PARP1 plays critical roles in DNA repair, transcription, translation, telomere maintenance, and chromatin remodeling.
  • The fundamental mechanisms governing PARP1's regulation of diverse nuclear processes require further elucidation.

Purpose of the Study:

  • To provide a comprehensive overview of PARP1 activity.
  • To elucidate the mechanisms by which PARP1 regulates essential nuclear events.
  • To offer a holistic perspective based on observable phenomena.

Main Methods:

  • Review of existing empirical data and literature.
  • Analysis of PARP1's role in protein-nucleic acid interactions.
  • Examination of poly-ADP-ribose's function as a scaffolding matrix.

Main Results:

  • PARP1 regulates nuclear processes via two primary mechanisms: protein shuttling and the formation of poly-ADP-ribose (PAR) matrices.
  • Protein shuttling influences protein-nucleic acid interactions, impacting gene regulation.
  • The PAR matrix acts as an anionic scaffold, facilitating protein recruitment and complex assembly.

Conclusions:

  • PARP1's multifaceted activity is central to maintaining nuclear homeostasis.
  • Understanding PARP1 mechanisms offers insights into DNA repair and gene regulation.
  • PARP1's dual regulatory strategies highlight its significance in cellular function.