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Identification of a novel site specific endonuclease produced by Mycoplasma fermentans: discovery while

N F Halden1, J B Wolf, W J Leonard

  • 1Cell Biology and Metabolism Branch, National Institute of Child Health and Human Development, Bethesda, MD 20892.

Nucleic Acids Research
|May 11, 1989
PubMed

Insights

A novel restriction enzyme, MfeI, was found in T cell nuclear extracts. This enzyme, MfeI, cuts DNA at a specific sequence, yielding ends compatible with EcoRI restriction enzyme.

Area of Science:

  • Molecular Biology
  • Enzymology
  • Immunology

Background:

  • Restriction endonucleases are crucial tools in molecular biology for DNA manipulation.
  • Mycoplasma contamination can introduce unexpected enzymatic activities into biological samples.
  • Understanding gene regulation requires identifying proteins that bind to specific DNA sequences, such as the interleukin-2 receptor alpha chain gene promoter.

Purpose of the Study:

  • To identify and characterize a novel restriction endonuclease discovered in T cell nuclear extracts.
  • To determine the specific DNA recognition sequence and cutting site of the new enzyme.
  • To explore the potential applications of this novel restriction enzyme.

Main Methods:

  • Nuclear extracts from T cells contaminated with Mycoplasma fermentans were analyzed.
  • Enzyme activity was detected and isolated.
  • The recognition sequence and cleavage site of the endonuclease were determined.
  • Compatibility of generated ends with known restriction enzymes was assessed.

Main Results:

  • A new restriction endonuclease, named MfeI, was discovered.
  • MfeI recognizes and cuts the DNA sequence C'AATTG.
  • The enzyme generates cohesive ends that are compatible with those produced by EcoRI.
  • The discovery occurred during the investigation of proteins binding to the interleukin-2 receptor alpha chain gene promoter.

Conclusions:

  • MfeI represents a newly identified restriction endonuclease with potential utility in molecular biology.
  • The enzyme's ability to generate EcoRI-compatible ends suggests applications in cloning and DNA manipulation.
  • Further research is warranted to fully elucidate MfeI's properties and applications.

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