Preparation of Single-Stranded Bacteriophage M13 DNA by Precipitation with Polyethylene Glycol

Area of Science:

• Molecular Biology
• Virology
• Biochemistry

Background:

• Bacteriophage M13 is a virus that infects bacteria, secreting single-stranded DNA into the surrounding medium.
• Purification of M13 filamentous particles is crucial for obtaining high-quality DNA.
• Existing methods for M13 DNA isolation can be complex or yield suboptimal purity.

Purpose of the Study:

• To present a reliable protocol for the preparation of bacteriophage M13 single-stranded DNA.
• To optimize the purification process for M13 viral particles.
• To ensure the isolated DNA is suitable for downstream applications like DNA sequencing.

Main Methods:

• Concentrating M13 viral particles using polyethylene glycol (PEG) precipitation with high salt.
• Releasing single-stranded DNA via phenol extraction.
• Collecting purified DNA through ethanol precipitation.

Main Results:

• The protocol effectively concentrates and purifies M13 viral particles.
• Phenol extraction successfully releases single-stranded DNA.
• The resulting DNA preparation is sufficiently pure for use as a template in DNA sequencing.
• Expected yields range from 5-10 µg of ssDNA per mL of infected cells for recombinant phages.

Conclusions:

• This protocol provides an efficient method for obtaining pure bacteriophage M13 single-stranded DNA.
• The prepared DNA is suitable for direct use in DNA sequencing.
• The method offers a practical approach for researchers working with M13 phage DNA.