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Related Experiment Videos

Cloning type-II restriction and modification genes.

K D Lunnen1, J M Barsomian, R R Camp

  • 1New England Biolabs, Inc., Beverly, MA 01915.

Gene
|December 25, 1988
PubMed
Summary
This summary is machine-generated.

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Researchers cloned bacterial methyltransferase genes into E. coli, finding most clones modified DNA fully. Some clones also contained endonuclease genes, affecting phage restriction capabilities.

Area of Science:

  • Molecular Biology
  • Genetics
  • Microbiology

Background:

  • Bacterial modification methyltransferases are crucial enzymes involved in DNA modification.
  • Understanding the genetic basis and functional expression of these enzymes is important for molecular biology research.

Purpose of the Study:

  • To clone and characterize genes encoding 38 type-II bacterial modification methyltransferases in Escherichia coli.
  • To investigate the functional expression and DNA modification capabilities of these cloned genes.
  • To examine the co-occurrence and impact of corresponding endonuclease genes on bacterial viability and phage restriction.

Main Methods:

  • Cloning of 38 type-II bacterial modification methyltransferase genes into Escherichia coli.
  • In vitro selection of protectively modified recombinant clones.

Related Experiment Videos

  • Assessment of DNA modification levels (full or partial).
  • Detection of co-cloned endonuclease genes.
  • Evaluation of phage restriction activity in relevant clones.
  • Assessment of clone viability, particularly those with endonuclease genes but lacking methyltransferase genes.

    • Main Results:

    • Successful cloning and expression of 38 type-II bacterial modification methyltransferase genes in E. coli.
    • Most clones exhibited full DNA modification, while a significant portion showed partial modification.
    • Approximately 50% of the clones contained genes for the corresponding endonucleases.
    • Some clones with endonuclease genes demonstrated phage restriction, while others did not.
    • Clones possessing endonuclease genes but lacking methyltransferase genes were found to be viable.

    Conclusions:

    • The study successfully cloned and expressed a diverse set of type-II bacterial modification methyltransferase genes.
    • The results highlight variability in DNA modification efficiency and the frequent co-occurrence of methyltransferase and endonuclease genes.
    • The viability of clones with endonuclease genes but no methyltransferase genes suggests complex regulatory mechanisms or alternative functions.