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Topic: Plasmid


In the News (Sun 16 Jun 19)

  
  Plasmid Insertion
Process by which a plasmid is used to import recombinant DNA into a host cell for cloning.
The plasmid is opened up and the gene is freed from its parent DNA strand.
They have complementary "sticky ends." The opened plasmid and the freed gene are mixed with DNA ligase, which reforms the two pieces as recombinant DNA.
www.accessexcellence.org /AB/GG/plasmid.html   (217 words)

  
  Kids.Net.Au - Encyclopedia > Plasmid   (Site not responding. Last check: )
Plasmids are circular DNA molecules that are separate from the chromosomal DNA (Fig.
Plasmids usually contain one or two genes that confer a selective advantage on the bacterium harboring them, e.g., the ability to build an antibiotic resistance.
Plasmids that exist only as a single copy in each bacterium are, upon cell division, in danger of being lost in one of the segregating bacteria.
www.kids.net.au /encyclopedia-wiki/pl/Plasmid   (639 words)

  
 Plasmid
A plasmid is double-stranded DNA not native to the regular chromosomal DNA of the organism.
Plasmid DNA is replicated separate from nuclear DNA, and is usually passed on to daughter cells.
Plasmids that are used in genetic engineering are called vectors; they transfer genes into the bacteria, and generally contain a genetic marker that can be selected for or against in the final resulting organism.
www.iscid.org /encyclopedia/Plasmid   (429 words)

  
 NEJM -- Multidrug Resistance in Yersinia pestis Mediated by a Transferable Plasmid
Plasmid pIP1202 was transferred by conjugation from Y.
Nucleotide sequence of the ampicillin resistance gene of Escherichia coli plasmid pBR322.
Characterization of In0 of Pseudomonas aeruginosa plasmid pVS1, an ancestor of integrons of multiresistance plasmids and transposons of gram-negative bacteria.
content.nejm.org /cgi/content/full/337/10/677   (2360 words)

  
 Plasmid Loss Study
Plasmids are defined as extrachromosomal circular genetic elements that are capable of self-replication and of transferring genes from one bacterium to another.
Plasmid DNA was isolated from the recombinant E. coli bacterial colonies to acquire the samples for electrophoresis.
Plasmid loss was detected in the bacterial colonies by determining the number of colonies that fluoresced green, indicating that the colonies still had the plasmid that contained the Green Flourescent Protein (GFP) and ampicillin resistance genes.
homepages.bw.edu /~mbumbuli/biotech/colin   (3168 words)

  
 Plasmid Summary
Plasmids often contain genes or gene cassettes that confer a selective advantage to the bacterium harboring them, e.g., the ability to make the bacterium antibiotic resistant.
Plasmids that exist only as one or a few copies in each bacterium are, upon cell division, in danger of being lost in one of the segregating bacteria.
Daughter cells that retain a copy of the plasmid survive, while a daughter cell that fails to inherit the plasmid dies or suffers a reduced growth-rate because of the lingering poison from the parent cell.
www.bookrags.com /Plasmid   (4406 words)

  
 MagExtractor -Plasmid- : COSMOBIO
As this kit employs the principle that magnetic silica beads bind plasmid DNA present in a lysate solution, it is not necessary to perform deproteinization using harmful reagents such as phenol, or ethanol precipitation.
Since the recovered plasmid DNA solution may contain some ethanol depending on the restriction endonuclease digestion grade method, it is possible that samples may not be immersed in the well with a standard loading dye.
In addition, part of the obtained plasmid was digested with a restriction endonuclease, and the plasmid extracted with this kit as well as the other commercial available kit were confirmed to be completely digested.
www.cosmobio.co.jp /export_e/products/molecular/products_TYB_20061004.asp   (578 words)

  
 Efficient Plasmid DNA Replication in Xenopus Egg Extracts Does Not Depend on Prior Chromatin Assembly -- Sanchez et al. ...
We have shown that plasmids replicate efficiently in activated eggs, provided they are injected before rather than after the start of the first cell cycle(5).
In a typical experiment, 2-10-µl aliquots of extract containing FV1 plasmid DNA were rapidly frozen on dry ice and were subsequently thawed and thoroughly dissolved by the addition of an equal volume of GuHCl buffer (4.5 M guanidine-HCl, 0.1 M EDTA, pH 8.0, 0.15 M NaCl, and 0.05% sarkosyl) (5, 6).
Incubation of plasmid molecules in metaphase arrested extracts, like unactivated whole eggs, enhances their subsequent replication when the cytoplasm or intact egg is activated to re-enter the cell cycle.
www.jbc.org /cgi/content/full/270/50/29676   (5208 words)

  
 Plasmid Isolation
The solution is neutralized and adjusted to high salt conditions (necessary for binding to a column) while proteins, chromosomal DNA, and cell debris precipitates and supercoiled plasmid DNA renatures and remains in solution.
Following centrifugation, the plasmid is further purified and concentrated from the supernatant using a small column containing silica gel that binds DNA in high salt conditions and elutes DNA in low salt conditions.
Plasmid Isolation (Prior to beginning, each group of 3 students should obtain microcentrifuge tubes containing 1 ml Buffer P1, 1 ml Buffer P2, 1.2 ml Buffer N3, 2.5 ml Buffer PE (1.25 ml in each of two tubes), and 0.5 ml water.
www.rhodes.edu /biology/glindquester/molbiol/plasmid.html   (1388 words)

  
 [No title]   (Site not responding. Last check: )
A plasmid carrying the 4·2 kb HindIII fragment and a kanamycin resistance marker, designated pBP4, was maintained as a single-copy plasmid in Mycobacterium smegmatis and was stably inherited in the absence of antibiotic selection.
Plasmid pBP4 was incompatible with the pJAZ38 replicon but was compatible with the widely used pAL5000 replicon, indicating that among the mycobacterial vectors now available there are two incompatibility groups.
The relationship of the marine plasmid replicons to known plasmid families was determined by sequence comparison.
lycos.cs.cmu.edu /info/plasmid--sequences.html   (503 words)

  
 Mini Plasmid Prep   (Site not responding. Last check: )
Plasmids are double-stranded circular DNAs (1kb to >200kb) that usually have one origin of replication and encode an enzyme advantageous to the bacteria, such as a restriction enzyme, or resistance to an antibiotic.
NaOH denatures chromosomal DNA and plasmid DNA, and SDS is a detergent that denatures bacterial proteins.
NaOH denatures chromosomal DNA and plasmid DNA, and SDS is a detergent that solubilizes membranes and denatures bacterial proteins.
www.siumed.edu /~bkinney/dnaprotocol.html   (2363 words)

  
 [No title]
The initiation of replication of a plasmid that is able to be maintained in a diverse group of bacteria (broad host range) is considerably less well understood than the initiation of replication of other prokaryotic replicons.
It is of particular interest to determine the nature of the interactions between a broad host plasmid origin of replication, the plasmid-encoded replication initiation protein and the host specific replication proteins that are responsible for initiating replication.
To further characterize the IncP-1 resistance plasmid pB10, isolated from a bacterial community residing in the activated sludge compartment of a waste-water treatment plant, the complete nucleotide sequence of the plasmid was established.
lycos.cs.cmu.edu /info/plasmid--figs.html   (695 words)

  
 Plasmid DNA
the plasmid with the goal of confirmation of identity of the plasmid gene insert.
Plasmid DNA isolation requires separation of this DNA from the chromosomal DNA in the bacterial cell as well as from the polysaccharides, lipids and proteins that constitute the cell.
The plasmid is separated from the bacterial DNA by virtue of the plasmid's relative stability in alkali.
a32.lehman.cuny.edu /molbio_course/plasmid_protocol.htm   (1226 words)

  
 DNA Plasmid Purification   (Site not responding. Last check: )
Plasmids are used for cloning vectors and for protein overexpression.
The plasmid to be purified in this study is pYP.
Following centrifugation, the plasmid DNA (in the supernatant) is further purified using a commercial hydrophobic ion chromatographic resin.
web.chemistry.gatech.edu /class/peek/4581/labs/plasmid_prep/9-plasmid_prep.html   (1657 words)

  
 [No title]
Attempts to eliminate the plasmid from strain L1 440 using the plasmid-curing agents ethidium bromide, acridine orange or imipramine/novobiocin led to a paradoxical increase in plasmid copy number.
The total intracellular plasmid copy number in an entire population may be obtained by integration of the plasmid distribution histogram multiplied by the total cell number.
Since the total intracellular plasmid copy number is 7.4×1010 and the applied plasmid copy number in a 1000ng/2000 ng treatment is 3.7×1011, the transmembrane efficacy of this cationic liposome vector is 20% at 24h incubation.
www.lycos.com /info/plasmid--ti-plasmid.html   (734 words)

  
 Plasmid - Elsevier
Plasmid is a bi-monthly journal that publishes original research on chromosomes and extrachromosomal elements with the emphasis on functions that contribute to their maintenance and transmission.
The journal is also a forum for articles on plasmids, bacteriophages, and mobile genetic elements, including transposons and genomic islands that contribute to microbial antibiotic resistance, pathogenicity, and evolution.
Papers devoted solely to nucleic acid sequences are not considered unless they provide some functional studies or new mechanistic insights.
www.elsevier.com /locate/issn/0147-619X   (210 words)

  
 Project 2: Evolution of Antibiotic Resistance Plasmids, Center for Research on Processes in Evolution (CRePE), ...
Plasmids play a central role in the spread of resistance among bacterial species thereby decreasing the effectiveness of various chemotherapeutic agents for the treatment of infectious diseases.
Plasmid evolution in one single host will be compared with evolution in alternating hosts, and in each case plasmids evolved for differing periods of time will be characterized.
Phenotypic changes will be characterized by examining the effect of the evolved plasmid on host fitness and by assessing differences in the stability and broad host range characteristics of the evolved and ancestral plasmids.
www.sci.uidaho.edu /biosci/CRePE/project2.html   (299 words)

  
 Plasmid DNA Function   (Site not responding. Last check: )
The transfer of plasmid DNA from one cell to another (or, in vitro, from the medium into a cell) we call 'transformation'.
Would you remove the plasmid completely from the cell ('curing' the cell), that property (say antibiotic resistance, or virulence) would then be lost.
In summary, in the absence of the antibiotic resistance gene encoded on the plasmid, a bacterial cell will not long survive the destruction of the plasmid; the plasmid is the sole source of the antibiotic resistance gene.
www.newton.dep.anl.gov /askasci/mole00/mole00391.htm   (504 words)

  
 PlasmID Database
PlasmID is a central repository for plasmid clone collection and distribution.
Registration is not required to view the collection.
PlasmID was created and is maintained by the DF/HCC DNA Resource Core
plasmid.med.harvard.edu /PLASMID   (151 words)

  
 ScienceDirect - Plasmid, Volume 58, Issue 3, Pages 205-284 (November 2007)
ScienceDirect - Plasmid, Volume 58, Issue 3, Pages 205-284 (November 2007)
Properties of Enterococcus faecalis plasmid pAD1, a member of a widely disseminated family of pheromone-responding, conjugative, virulence elements encoding cytolysin
Complete nucleotide sequence of pLD-TEX-KL, a 66-kb plasmid of Legionella dumoffii TEX-KL strain
www.sciencedirect.com /science/journal/0147619X   (285 words)

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