Plasmid Partitioning
Plasmid Partitioning - 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.
12:34
Monitoring Plasmid Replication in Live Mammalian Cells over Multiple Generations by Fluorescence Microscopy
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Cited by 4 •
2012
A method of observing individual DNA molecules in live cells is described. The technique is based on the binding of a fluorescently tagged lac repressor protein to binding sites engineered into the DNA of interest. This method can be adapted to follow many recombinant DNAs in live cells over time.
01:28
Plasmids
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2025
Plasmids are extrachromosomal DNA molecules found in bacteria, archaea, and some eukaryotic microbes like yeast. These small, circular DNA structures typically contain fewer than 30 genes, although some may exist linearly. Plasmids vary in their number within a cell, known as copy number. Single-copy plasmids are present in one copy per cell and multi-copy plasmids are present in multiple copies, reaching over 100 copies per cell.Plasmids usually replicate independently of the chromosomal DNA...
07:11
Homemade Site Directed Mutagenesis of Whole Plasmids
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Cited by 91 •
2009
Site directed mutagenesis of whole plasmids is a simple way to create slightly different variations of an original plasmid. Here we demonstrate an easy and cost effective way to introduce base substitutions into a plasmid using standard reagents.
01:14
Extraction: Partition and Distribution Coefficients
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2024
The distribution law or Nernst's distribution law is the law that governs the distribution of a solute between two immiscible solvents. This law, also known as the partition law, states that if a solute is added to the mixture of two immiscible solvents at a constant temperature, the solute is distributed between the two solvents in such a way that the ratio of solute concentrations in the solvents remains constant at equilibrium. For extracting a solute from an aqueous phase into an organic...
FAQs
In a parS-based partition system, the parS site provides a centromere-like location on the plasmid, ParB binds that site, and the ATPase ParA contributes to positioning before cell division. Their coordinated action organizes plasmid copies so they can be distributed to daughter cells, rather than relying only on plasmid abundance.
The ParM-ParR strategy uses a different physical arrangement from the parS-ParB-ParA system. ParM forms actin-like filaments, while ParR acts as an adaptor associated with the plasmid, allowing the filaments to push plasmid copies apart. This contrast shows that stable inheritance can be achieved through distinct molecular mechanisms.
A useful comparison focuses on the molecular components and the physical action each system uses. One architecture combines parS, ParB, and ParA to position plasmids, whereas the other combines ParM filaments with the ParR adaptor to push copies apart. This comparison distinguishes positioning by an ATPase-associated system from separation driven by actin-like filaments.
Partitioning is especially important for plasmids maintained at low copy number. Without an active distribution mechanism, replicated copies could be unevenly inherited, making persistence less reliable across cell divisions. By promoting stable inheritance, partition systems allow plasmids carrying useful genes to remain in bacterial populations without requiring many copies per cell.
The mechanism can preserve plasmid-borne antibiotic-resistance, virulence, and metabolic genes as cells divide. This links a physical DNA-distribution process to traits that influence bacterial resistance, pathogenicity, and metabolism. The partition system therefore affects whether these extrachromosomal genetic functions persist in a bacterial population.
The topic connects the mechanics of plasmid distribution with broader questions about mobile genetic elements. Studying systems built from parS, ParB, ParA, ParM, and ParR can clarify how plasmids persist and how their associated genes are maintained without high copy numbers. This knowledge may inform strategies for controlling mobile genetic elements.