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Effects of DNA heterologies on bacteriophage lambda packaging

R K Pearson1, M S Fox

  • 1Department of Biology, Massachusetts Institute of Technology, Cambridge, 02139, USA.

Genetics
|January 1, 1988
PubMed
Summary

DNA packaging in vitro has a limit for heterology size. Molecules with up to 19 base pairs (bp) of DNA heterology can be packaged, but larger ones are rarely encapsulated by the phage packaging apparatus.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Virology

Background:

  • Bacteriophage lambda DNA packaging is a complex process involving specific protein machinery.
  • Understanding the physical constraints of this machinery is crucial for genetic engineering and viral vector development.
  • DNA heterologies, or mismatches, can arise during DNA manipulation and may affect packaging efficiency.

Purpose of the Study:

  • To investigate the impact of DNA heterologies on the in vitro packaging efficiency of bacteriophage lambda DNA.
  • To determine the maximum size of DNA heterology that can be accommodated by the lambda phage packaging apparatus.
  • To elucidate the mechanism by which DNA heterologies affect packaging, focusing on encapsulation versus injection.

Main Methods:

  • Construction of lambda DNA molecules containing heterologies of varying sizes (up to 26 base pairs) through denaturation and reannealing.
  • In vitro packaging of these heterology-containing DNA molecules using the lambda phage packaging system.
  • Analysis of packaged DNA using Southern blot hybridization to quantify the presence of heterology-containing molecules.
  • Assessment of plaque formation by packaged phage to determine viability and packaging efficiency.

Main Results:

  • Lambda DNA molecules with heterologies up to 19 base pairs (bp) were packaged with efficiencies similar to molecules with single base pair mismatches.
  • Packaging efficiency dropped significantly for DNA molecules containing a 26-bp heterology, with heterozygous plaque formers being rare.
  • Southern blot analysis revealed that DNA harboring a 26-bp heterology was largely absent in the successfully packaged phage particles.
  • This suggests a failure in DNA encapsulation rather than DNA injection upon infection for larger heterologies.

Conclusions:

  • An upper limit exists for the size of DNA heterology that the lambda phage packaging apparatus can accommodate.
  • This size limit is likely determined by the physical constraints of the packaging machinery, potentially the connector portal.
  • The findings have implications for the use of phage lambda in molecular cloning and gene delivery systems where DNA integrity is critical.

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