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Friday, May 1, 2020 | History

4 edition of Identification of high-copy-number inhibitors of P1 plasmid stability found in the catalog.

Identification of high-copy-number inhibitors of P1 plasmid stability

Natalie Erdmann

Identification of high-copy-number inhibitors of P1 plasmid stability

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  • 15 Currently reading

Published by National Library of Canada in Ottawa .
Written in English


Edition Notes

Thesis (M.Sc.) -- University of Toronto, 1998.

SeriesCanadian theses = -- Thèses canadiennes
The Physical Object
FormatMicroform
Pagination1 microfiche : negative. --
ID Numbers
Open LibraryOL18811871M
ISBN 100612340554
OCLC/WorldCa46578356

Plasmid pCas from Dr. Sheng Yang's lab contains the insert cas9 and is published in Appl Environ Microbiol. Jan pii: AEM This plasmid is available through Addgene. Nucleic Acids Res. Mar (6) PubMed ID Method The intracellular copy numbers were determined by comparing luciferase activity of cells harbouring the respective plasmids with the activity in cells containing only a single luciferase expression unit integrated in the chromosome (data not shown). Plasmids are generally prepared from bacterial cultures grown in the presence of a selective agent such as an antibiotic. The yield and quality of the plasmid DNA prepared may depend on a number of factors including plasmid copy number, size of insert, host strain, culture volume, and culture medium. Click on the links below to find out more.


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Identification of high-copy-number inhibitors of P1 plasmid stability by Natalie Erdmann Download PDF EPUB FB2

Stuitje AR, Spelt CE, Veltkamp E, Nijkamp HJ. Identification of mutations affecting replication control of plasmid Clo DF Nature. Mar 19; ()– Summers DK, Sherratt DJ. Multimerization of high copy number plasmids causes instability: CoIE1 encodes a determinant essential for plasmid monomerization and stability.

Cell. VIROL () Identification of the P1 Compatibility and Plasmid Maintenance Locus by a Mini P1 /ac+-Plasmid AVIGDOR SHAFFERMAN, TANIA GELLER,' AND ISRAEL HERTMAN2 Israel Institute/or Biological Identification of high-copy-number inhibitors of P1 plasmid stability book, Ness-Ziona, and Department of Life Sciences Bar-Ilan University, Ramat-Gan, Israel Accepted Janu pIH is a Mdal lac'*' plasmid derived from by: 8.

Related factors are plasmid copy number, structural plasmid stability and segregational plasmid stability. Plasmid copy number determines the gene dosage accessible for expression and many plasmids lead generally to a high productivity.

To analyze an expression system the quantification of plasmid copy number is very by: Since a plasmid expressing dnaB + (pDnaB2) could Identification of high-copy-number inhibitors of P1 plasmid stability book complement the dnaB allele and restore viability at 42°C, we asked whether it could restore P1 stability in the cells in the type of plasmid retention assay described above (Table (Table5).

We observed that pDnaB2 could restore P1 stability to nearly wild-type levels in N99 dnaBCited by: Discussion The natural, high copy number plasmid ColE1 is stably maintained, whereas cloning vectors derived from ColE1 (or its close relatives pMB1 and p1 5A) are generally unstable.

We have investigated the causes of high copy number plasmid instability and have reached the following by: Because of the availability of zracA-deleted high copy number plasmids we could directly show decrease in plasmid copy number in the presence of incA.

Earlier studies were done with wild-type unit copy plasmids, and inhibition of replication was argued from decreased plasmid stability or cell survival when the latter was made dependent upon Cited by: Plasmid copy number (PCN) determines the gene dosage which is defined theoretically as number of genetic units accessible for expression.

Therefore, quantification of the plasmid Identification of high-copy-number inhibitors of P1 plasmid stability book number is Author: Karl Friehs. A way to determine experimentally if the copy number of your plasmid is high or low is to perform a miniprep.

A high-copy plasmid should yield between ug DNA per 1 ml LB culture, while a low-copy plasmid will yield between ug DNA per ml of LB culture.

Origins of replication and copy numbers of various plasmids and cosmids. Although the natural multicopy plasmid ColE 1 is maintained stably under most growth conditions, plasmid cloning vectors related to it are relatively unstable, being lost at frequencies of 10−2–10−5 per cell per generation.

Evidence suggests that ColE 1 and related plasmids are partitioned randomly at cell division and that plasmid stability is correlated inversely with plasmid Cited by: 6. To amplify the plasmid, add ml E.

coli to ml LB with antibiotics in a ml sterile flask. Cover with foil and incubate overnight on a shaking incubator at 37o C. Follow directions Identification of high-copy-number inhibitors of P1 plasmid stability book Qiagen-tip kit for the preparation of plasmids.

Do two 5 ml ethanol washes at the end. Air dry and resuspend by gentle swirling in ul TE Size: 16KB. Identification of high-copy-number inhibitors of P1 plasmid stability book of Aug. 15,we are suspending plasmid distribution from the collection.

If you would like to request BioPlex ORF clones (Harper lab) or if you identify other clones in our collection for which you cannot find an alternative, please email us at [email protected] The composition of Buffer P1 is.

50 mM TrisCl, pH ; 10 mM EDTA; µg/ml RNase A; After RNase A addition, the buffer should be stored at 2–8°C. Buffer P1 is the resuspension buffer used in a variety of QIAGEN kits for plasmid DNA s on buffer preparation and storage are presented in Appendix B of the QIAGEN Plasmid Purification Handbook.

Their segregational stability implies that they are actively partitioned, rather than distributed to daughter cells at random. Genes that participate in this task were identified first in plasmids such as F and P1 (2; 28) and, subsequently, on the basis of homologies, in a variety of prokaryotic by: Studies on the plasmid stability, plasmid copy number and endo (1,3)(1,4) P-glucanase production by free and alginate immobilised recombinant Saccharomyces cerevisiae cells.

A recombinant yeast strain, Saccharomyces cerevisiae DBY, containing the plasmid pJG, was grown in a variety of fermentation modes including batch,File Size: 4MB.

The selected plasmid ori mutations are diverse and produce a range of plasmid copy numbers, suggesting a complex interplay between ori and coding mutations rather than a simple enhancement of level of expression of the target gene.

Thus, plasmid dosage may contribute significantly to evolution by fine-tuning levels of by: 5. To confirm the minimal high-copy-number replication origin, we cloned the kb NotI fragment of [email protected]

The resulting plasmid, pRF63, had a high copy number (measured qualitatively; see Materials and Methods) and consisted of repI, repII, the noncoding region with the bp deletion, SCP, SCP, and a bp section of SCPc. Another Cited by: Replication intermediates (RIs) of a miniP1 plasmid, pSP, were analyzed by neutral/neutral two-dimensional (2D) agarose gel electrophoresis to determine the initiation site and directions of movement of the replication forks.

pSP has the wild-type origin with the two sets of DnaA boxes, and and bp of P1 sequences that flank the boxes at the left and right, respectively (Figure 1(a)).Cited by: Biotechnology applications may involve engineering plasmids to allow a very high copy number.

For example, pBR is a low copy number plasmid (~20 copies/cell) from which several very high copy number cloning vectors (~ copies/cell) have been derived.

Determination of Plasmid Segregational Stability in a Growing Bacterial Population and treatment of infectious and non-infectious diseases, as well as cancer. of the high copy number. The plasmid copy number and plasmid respectively DNA concentration are 2 different pair of shoes.

The copy number of a plasmid is depending on the origin of replication (ORI) they contain. This method lasts at least several hours and is completely useless for a rapid determination of plasmid stability.

There- fore plasmid stability has to be neglected during rapid determination of plasmid copy number. In addition, the yield of plasmid recovery may vary from plasmid to plasmid and with the ex- traction method by: For plasmid ColE1, it has been suggested that a multistep inhibition process or the use of two different plasmid‐encoded inhibitors, RNA I and the Rom protein, can give higher sensitivity and narrower distributions (Paulsson and Ehrenberg, ).

Copy numbers in single cells are not easily measured, but experiments dealing with averages over Cited by: Escherichia coli Plasmid Copy Number Assay INTRODUCTION For the plasmid copy number assay, two pairs of probes are required, one pair for the plasmid determination and one pair for the chromosome determination.

It is convenient and desirable for the plasmid and chromosomal target fragments to be released by the same restriction enzyme. Therefore, its main function in plasmid R1 is probably restricted to copy control.

The appearance of low copy numbers of miniplasmids carrying this determinant and of trans-acting copy control and strong incompatibility exerted by hybrid plasmids is consistently correlated with the presence of a protein of 11, molecular weight, synthesized Cited by: 8.

Targets for identification of additional plasmid groups were added to the typing method by Garcia-Fernandez et al. 13 and Villa et al. 14 The method was adapted by Boot et al. 15 with the aim to speed up the procedure and to make it more sensitive using real-time PCR, which may increase sensitivity of detection of low-copy plasmid by: An unexpectedly high percentage of the cells had very low plasmid copy numbers, despite the high mean copy number of This characteristic however disappeared for a mutant which additionally.

Plasmid DNA (pDNA) is a promising molecule for therapeutic applications. pDNA is produced by Escherichia coli in high cell-density cultivations (HCDC) using fed-batch mode.

The typical limitations of such cultivations, including metabolic deviations like aerobic acetate production due to the existence of substrate gradients in large-scale bioreactors, remain as serious challenges for fast and.

Low-copy plasmids make use of several different genetic loci, which usually map outside of the minimal replicon, to ensure almost absolute plasmid stability (1, 2). A subset of plasmid-encoded functions ensures one or two rounds of replication per cell cycle and the distribution of the replicated copies to nascent daughter cells.

Interestingly, the adapted plasmids showed a significant fitness cost compared to the native plasmid (Fig. 2), as well as reduced plasmid stability (p_3_OXACAZ-AVI) in the absence of.

The Middle East respiratory syndrome coronavirus (MERS-CoV) was first isolated inand circulated worldwide with high mortality. The continual outbreaks of MERS-CoV highlight the importance of developing antiviral therapeutics.

Here, we rationally designed a novel fusion inhibitor named MERS-five-helix bundle (MERS-5HB) derived from the six-helix bundle (MERS-6HB) which was formed by Cited by: 4. Figure 2C shows that the imbalance of RepA to pSC plasmids that occured when plasmid copy number was decreased by temporary inhibition of plasmid DNA replication resulted in induction of the SOS response, as monitored by an increase in lacZ expression in cells containing the SOS‐responsive sfiA::lacZ gene by:   These sites are essential for plasmid stability, bind RepB and are incompatible with their respective parental plasmid when provided in tr36,59, Cited by: The same result was obtained when high‐copy‐number plasmids harbouring lacO were used for ORT.

In this case the plasmid was stably maintained over 72 generations (Williams et al., ). ORT = operator repressor titration. ORT is one of the three main groups of PAS. Plasmid from Dr. Didier Trono's lab contains the insert ATM shRNA and is published in J Virol.

Mar. 79(5) This plasmid is available through Addgene. Plasmid Biology captures in a single volume the wealth of information on plasmid structure, function, and biology.

Appearing in nearly all organisms that have been examined to date, plasmids exhibit wide variations in size, modes of replication and transmission, host ranges, and genes they carry and have provided us with a great understanding of basic life principles at the molecular level.

Two DNA sequences that reduce mitotic fidelity of chromosome transmission have been identified: MIF1 and 1 is a unique sequence located on the right arm of chromosome XII that stimulates loss and recombination for both chromosomes V and VII when present in a high copy number 1 is not essential for cell division but is necessary for the normal fidelity of chromosome transmission.

Using a partition-deficient plasmid vector, we randomly cloned DNA fragments of plasmid pLS11 and identified the locus that regulates plasmid partition (par) by cis complementation in Bacillus subtilis.

The cloned par gene conferred upon the vector plasmid a high degree of segregational by:   A direct inhibition mechanism has been proposed for plasmid ColE2, in which the formation of a stable complex between the ctRNA and the complementary region in the rep mRNA would be able to inhibit rep expression, even though the ctRNA does not overlap the putative translation initiation region of the essential gene (T.

Itoh, personal Cited by: Multimerization of high copy number plasmids causes instability: CoIE1 encodes a determinant essential for plasmid monomerization and stability.

Cell. Apr; 36 (4)– Tabuchi A, Min YN, Kim CK, Fan YL, Womble DD, Rownd RH. Genetic organization and nucleotide sequence of the stability locus of IncFII plasmid NR1. Right. As per definition: An average or let's say expected number of values of Plasmid DNA per host cells.

These plasmid copy numbers may be either low, optimum or high. So let's try to understand the answer in an easier way, shall we, We all. Description cyclin dependent pdf inhibitor 1B Also known Species Homo sapiens Entrez ID MGC ID BC Plasmids containing this gene, or a homologous gene.

ID Plasmid Gene/Insert PI ; pCMV5 human p27 Vogelstein Add to Cart pcDNA3-myc3-p CDKN1B cyclin-dependent kinase inhibitor 1B (Homo sapiens) Xiong Add to. The same mutation also reduced the number of plasmid copies from 13 to 5, as well as the plasmid stability.

When a similar sequence in a ColE1 derivative, pYCW, is mutated, the copy number of the plasmid also declines from 34 to 16 per by: 7.However, at some stage ebook wild type plasmid with low copy number ebook back invade the high copy number population (Figures 3A and 3B).

This was owing to the large metabolic burden on the host cell carrying the high copy number plasmid. The back invasion was possible only when the copy number of the invading variant was substantially by: