Related Experiment Video
Updated: Jun 22, 2026
10:36
Visualization of UV-induced Replication Intermediates in E. coli using Two-dimensional Agarose-gel Analysis
Published on: December 21, 2010
Topological analysis of plasmid DNA replication intermediates using two-dimensional agarose gels
1Genetique Moleculaire, Ecole Normale Supérieure, Paris, France.
Methods in Molecular Biology (Clifton, N.J.)
|July 1, 2009
Summary
This study details a method using 2D agarose gel electrophoresis to analyze DNA topology during replication. It helps understand DNA topoisomerase function and the impact of inhibitors on replication intermediates.
Area of Science:
- Molecular Biology
- Biochemistry
- Genetics
Background:
- DNA replication requires disentangling parental strands by DNA topoisomerases.
- Understanding the topological changes during replication is crucial for cell viability.
Purpose of the Study:
- To detail a method for topological analysis of plasmid replication intermediates.
- To investigate the role of DNA topoisomerases in resolving replication topology.
Main Methods:
- Two-dimensional (2D) agarose gel electrophoresis to resolve DNA replication intermediates by mass and topology.
- Analysis of unlinked monomeric circles and catenated dimers.
- Combination with covalent protein-DNA complex purification.
Main Results:
- The 2D gel method effectively resolves replication intermediates based on mass and topology.
- The technique allows analysis of topoisomerase inhibitor effects on replication intermediates.
- It enables mapping of drug-stabilized topoisomerase complexes and detection of replication fork dynamics.
Conclusions:
- 2D agarose gel electrophoresis is a powerful tool for studying DNA replication topology.
- This method aids in understanding DNA topoisomerase mechanisms and drug interactions.
- It provides insights into replication fork stability and DNA knot formation.
More Related Videos
Related Concept Videos
02:35DNA Agarose Gel Electrophoresis
Agarose gel electrophoresis is a laboratory technique commonly used to separate DNA fragments by size. However, it can also be used to isolate and purify DNA fragments using a gel extraction protocol.
Gel extraction follows five major steps: running gel electrophoresis to separate fragments, isolating the individual bands, extracting DNA from those bands, and removing the dye and salts from the extracted mixture to obtain pure DNA.
In cloning experiments, both the insert and vector DNA...
Gel extraction follows five major steps: running gel electrophoresis to separate fragments, isolating the individual bands, extracting DNA from those bands, and removing the dye and salts from the extracted mixture to obtain pure DNA.
In cloning experiments, both the insert and vector DNA...
01:22Two-dimensional Gel Electrophoresis
Two-dimensional gel electrophoresis is a high-resolution protein separation method first introduced by O' Farrell and Klose in 1975. This method involves protein separation by two dimensions, mass and charge, making it more accurate than one-dimensional gel electrophoresis.
The first dimension separation uses the isoelectric focusing or IEF technique performed on immobilized pH gradient (IPG) strips that separate proteins according to their isoelectric points.
Biological samples, such as cells...
The first dimension separation uses the isoelectric focusing or IEF technique performed on immobilized pH gradient (IPG) strips that separate proteins according to their isoelectric points.
Biological samples, such as cells...