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Related Experiment Videos

Correct integration of model substrates by Ty1 integrase.

S P Moore1, D J Garfinkel

  • 1Gene Regulation and Chromosome Biology Laboratory, National Cancer Institute-Frederick Cancer Research and Development Center, National Institutes of Health, Frederick, Maryland 21702-1201, USA. moores@mail.ncifcrf.gov

Journal of Virology
|November 23, 2000
PubMed
Summary
This summary is machine-generated.

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The Ty1 integrase (IN) and virus-like particles (VLPs) can integrate DNA in vitro. While IN is sufficient, VLPs show higher efficiency, suggesting IN

Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • The Ty1 element in Saccharomyces cerevisiae is a retrovirus-like mobile genetic element.
  • Ty1 transposition to new genomic locations is mediated by the element-encoded integrase (IN).

Purpose of the Study:

  • To investigate the in vitro catalytic activity of Ty1 integrase (IN) and virus-like particles (VLPs).
  • To characterize the requirements and efficiency of Ty1 DNA integration mediated by IN and VLPs.

Main Methods:

  • Purification of recombinant Ty1 IN.
  • In vitro integration assays using supercoiled target plasmids and linear DNA donors.
  • Analysis of integration products using Southern blotting.
  • Testing the effect of divalent cations (Mg2+, Mn2+) on integration and nuclease activity.

Related Experiment Videos

Main Results:

  • Purified recombinant IN catalyzed the correct integration of linear DNA into a supercoiled plasmid in vitro.
  • Ty1 VLPs demonstrated more efficient DNA integration compared to purified IN.
  • Both IN and VLP-mediated integrations occurred at random sites in the target DNA.
  • Magnesium (Mg2+) was preferred over manganese (Mn2+) for correct integration, with neither cation enhancing nonspecific nuclease activity.
  • Recombinant IN and VLPs could utilize various linear donor fragments, including those with non-Ty1 ends and a U3 mutation defective in vivo.

Conclusions:

  • Ty1 IN is sufficient for catalyzing DNA integration in vitro.
  • Ty1 VLPs are more efficient integrase complexes than purified IN.
  • Ty1 IN exhibits less stringent interactions with exogenous donor DNA compared to endogenous elements.