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Related Concept Videos

DNA Agarose Gel Electrophoresis02:35

DNA 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.
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Electrophoresis: Overview

Electrophoresis is a powerful analytical separation technique that relies on the differential migration of charged species when subjected to an electric field. The core strength of electrophoresis lies in its ability to separate high-molecular-weight species in complex mixtures. It has found widespread use in biochemistry, molecular biology, and analytical chemistry, allowing the separation of compounds like amino acids, nucleotides, carbohydrates, and proteins with excellent resolution.
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Screening for Functional Non-coding Genetic Variants Using Electrophoretic Mobility Shift Assay (EMSA) and DNA-affinity Precipitation Assay (DAPA)
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Screening for Functional Non-coding Genetic Variants Using Electrophoretic Mobility Shift Assay (EMSA) and DNA-affinity Precipitation Assay (DAPA)

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Mobility shift DNA-binding assay using gel electrophoresis.

S Buratowski1, L A Chodosh

  • 1Harvard Medical School, Boston, Massachusetts, USA.

Current Protocols in Molecular Biology
|February 12, 2008
PubMed
Summary
This summary is machine-generated.

This study introduces a simple, sensitive DNA-binding assay using nondenaturing polyacrylamide gel electrophoresis (PAGE). It effectively detects sequence-specific DNA-binding proteins and quantifies their binding characteristics.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • Detecting sequence-specific DNA-binding proteins is crucial for understanding gene regulation.
  • Existing methods can be complex or lack sensitivity.

Purpose of the Study:

  • To present a simple, rapid, and highly sensitive method for detecting sequence-specific DNA-binding proteins.
  • To enable quantitative analysis of protein-DNA interactions.

Main Methods:

  • Nondenaturing polyacrylamide gel electrophoresis (PAGE) of end-labeled DNA fragments incubated with proteins.
  • Analysis of retarded DNA fragment mobility to identify protein-DNA complexes.

Main Results:

  • The DNA-binding assay successfully detects sequence-specific DNA-binding proteins.
  • It allows for quantitative determination of binding affinity, abundance, and kinetics.
  • Additional protocols for competition, supershift, and multicomponent assays are described.

Conclusions:

  • Nondenaturing PAGE is a versatile and sensitive technique for studying DNA-binding proteins.
  • The assay is applicable to both purified proteins and factors in crude extracts.
  • This method facilitates comprehensive characterization of protein-DNA interactions.