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Related Concept Videos

Nucleotide Excision Repair01:08

Nucleotide Excision Repair

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Nucleotide Excision Repair01:38

Nucleotide Excision Repair

DNA Distortion and Damage
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
Nucleotide Excision Repair01:08

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Base Excision Repair01:54

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One of the common DNA damages is the chemical alteration of single bases by alkylation, oxidation, or deamination. The altered bases cause mispairing and strand breakage during replication. This type of damage causes minimal change to the DNA double helix structure and can be repaired by the base excision repair (BER) pathways. BER corrects damaged DNA sequences by removing the damaged base and restoring the original base sequence using the complementary strand as a template.
The first step of...
Translesion DNA Polymerases02:10

Translesion DNA Polymerases

Translesion (TLS) polymerases rescue stalled DNA polymerases at sites of damaged bases by replacing the replicative polymerase and installing a nucleotide across the damaged site. Doing so, TLS allows additional time for the cell to repair the damage before resuming regular DNA replication.
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Homologous Recombination02:31

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The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...

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Proximity Ligand Assay to Localize Proteins in DNA Damage Sites
09:39

Proximity Ligand Assay to Localize Proteins in DNA Damage Sites

Published on: August 2, 2024

DNA damage-site recognition by lysine conjugates.

Boris Breiner1, Jörg C Schlatterer, Igor V Alabugin

  • 1Department of Chemistry and Biochemistry, Florida State University, Tallahassee, FL 32306-4390, USA.

Proceedings of the National Academy of Sciences of the United States of America
|August 1, 2007
PubMed
Summary

Simple lysine conjugates precisely target and damage DNA, converting single-strand breaks into double-strand breaks. This breakthrough offers potential for gene therapy, cancer treatment, and DNA construct design.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Chemical Biology

Background:

  • DNA damage is crucial in gene therapy and cancer treatment.
  • Existing DNA-cleavage methods often lack precise site-specificity.
  • Enzymatic DNA processing involves large protein machinery.

Purpose of the Study:

  • To investigate the DNA-damaging capabilities of simple lysine conjugates.
  • To develop a strategy for site-selective DNA cleavage using small molecules.
  • To demonstrate DNA damage site recognition by molecules significantly smaller than enzymes.

Main Methods:

  • Utilizing simple lysine conjugates for targeted DNA modification.
  • Inducing single-strand DNA cleavage and observing its transformation to double-strand cleavage.
  • Designing shorter counterstrands to recreate duplex DNA damage sites for cleavage.
  • Employing molecular recognition principles for site-specific nucleotide cleavage.

Main Results:

  • Lysine conjugates demonstrated selective DNA damage at specific sites.
  • The process effectively converted single-strand DNA cleavage into double-strand cleavage.
  • Molecules significantly smaller than enzymes were shown to recognize DNA damage sites.
  • A strategy for site-selective cleavage of single-strand nucleotides was successfully presented.

Conclusions:

  • Simple lysine conjugates can induce targeted DNA damage, mimicking natural patterns.
  • This approach offers a novel strategy for site-selective DNA cleavage with therapeutic and design implications.
  • The study highlights the potential of small molecules in precise DNA manipulation, challenging the reliance on large enzymes.