Plasmid Dna Purification
Plasmid Dna Purification - Related Videos
08:16
Plasmid Purification
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2023
Plasmid purification is a technique used to isolate and purify plasmid DNA from genomic DNA, proteins, ribosomes, and the bacterial cell wall. A plasmid is a small, circular, double-stranded DNA that is used as a carrier of specific DNA molecules. When introduced into a host organism via transformation, a plasmid will be replicated, creating numerous copies of the DNA fragment under study. In this video, a step-by-step generalized procedure is described for how to perform plasmid purification.
06:53
Streamlined Purification of Plasmid DNA From Prokaryotic Cultures
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Cited by 1 •
2011
This protocol is a cost effective alternative for efficient parallel clarification and plasmid DNA purification from E. coli cultures. The AcroPrep Advance process starts with an optimized lysate clarification filter plate followed by purification on a high binding capacity DNA binding filter plate.
11:31
Generation of Recombinant Influenza Virus from Plasmid DNA
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Cited by 129 •
2010
Rescue of influenza A viruses from plasmid DNA is a basic and essential experimental technique that allows influenza researchers to generate recombinant viruses to study multiple aspects in the biology of influenza virus, and to be used as potential vectors or vaccines.
14:26
Genome-wide Purification of Extrachromosomal Circular DNA from Eukaryotic Cells
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Cited by 59 •
2016
This paper presents a sensitive method called Circle-Seq for purifying extrachromosomal circular DNA (eccDNA). The method encompasses column purification, removal of remaining linear chromosomal DNA, rolling-circle amplification and high-throughput sequencing. Circle-Seq is applicable to genome-scale screening of eukaryotic eccDNA and studying genome instability and copy-number variation.
05:11
Organoid Electroporation: A Method to Transfect Plasmid DNA into Gastrointestinal Organoids
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2023
This video describes the electroporation protocol for transfecting large plasmids into three-dimensional gastrointestinal organoids to prove its universal functionality in different entities, namely pancreatic ductal adenocarcinoma (PDAC), colorectal cancer (CRC), cholangiocarcinoma (CCC), and gastric cancer (GC) organoids.
FAQs
Alkaline lysis disrupts bacterial cells and exposes their DNA and proteins to conditions that denature chromosomal DNA and proteins. Because plasmid DNA is circular and extrachromosomal, it remains recoverable after the lysate is neutralized. This selective behavior allows the method to separate plasmids from much of the bacterial material without requiring direct manipulation of individual DNA molecules.
Neutralization reverses the alkaline conditions used during cell disruption and enables plasmid DNA to become recoverable from the lysate. It also supports separation of the desired plasmid from denatured chromosomal DNA and proteins. If this transition is not properly achieved, unwanted cellular components may remain associated with the sample and reduce the quality of material collected for downstream analysis.
RNase treatment targets contaminating RNA that can remain in material released from bacterial cells. Removing this RNA improves the composition of the purified sample and makes subsequent purity assessment more meaningful. This step is especially relevant when researchers need plasmid preparations suitable for molecular biology applications, where non-DNA nucleic acids could interfere with interpretation or handling.
After lysis and neutralization, centrifugation helps separate cellular material from the fraction containing recoverable plasmid DNA. The plasmid can then be isolated and concentrated using either a silica-based column or precipitation. These alternatives provide different purification formats while serving the same practical goal: obtaining a cleaner, more concentrated DNA preparation for analysis or experimental use.
Two stated approaches are absorbance measurements and gel electrophoresis. Absorbance provides a measurement-based assessment of sample purity, while gel electrophoresis allows researchers to examine the DNA preparation as separated bands. Using these methods helps determine whether the recovered material is suitable for later work and can reveal differences in sample quality that are not apparent from concentration alone.
Purified plasmids support several genetic engineering workflows, including cloning, DNA sequencing, and gene expression studies. They can also provide DNA for transfection, in which genetic material is introduced into cells for experimental investigation. The purification step is therefore important because it supplies a cleaner, concentrated plasmid preparation that can be carried into diverse molecular biology experiments.