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Related Experiment Videos

Reverse transcriptase in bacteria.

D Lim1, W K Maas

  • 1Department of Microbiology, New York University Medical Center, NY 10016.

Molecular Microbiology
|August 1, 1989
PubMed
Summary
This summary is machine-generated.

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Reverse transcriptase, an enzyme once thought unique to eukaryotes, has been discovered in bacteria like E. coli. This enzyme produces a branched DNA-RNA compound with an unknown biological function.

Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Reverse transcriptase (RT) was initially discovered in retroviruses in 1970.
  • RT was previously believed to exist exclusively in eukaryotic organisms.
  • Recent findings indicate the presence of RT in two bacterial groups: myxobacteria and Escherichia coli.

Purpose of the Study:

  • To investigate the occurrence and characteristics of reverse transcriptase in bacteria.
  • To elucidate the structure and formation of the DNA-RNA compound produced by bacterial RT.
  • To explore the genetic basis and potential function of this novel bacterial system.

Main Methods:

  • Identification and characterization of reverse transcriptase activity in bacterial species.
  • Analysis of the genetic element associated with RT production.

Related Experiment Videos

  • Structural analysis of the branched DNA-RNA compound using molecular techniques.
  • Investigation of the precursor messenger RNA and the role of RNase H in processing.

    • Main Results:

    • Reverse transcriptase has been identified in myxobacteria and Escherichia coli.
    • The gene for bacterial RT is linked to a genetic element responsible for producing a branched DNA-RNA compound.
    • This compound features a unique 2'-5' phosphodiester linkage between single-stranded DNA and RNA.
    • The DNA-RNA compound originates from a folded messenger RNA precursor and is processed by RNase H, existing in hundreds of copies per cell.

    Conclusions:

    • Reverse transcriptase activity is present in prokaryotic organisms (bacteria), expanding its known biological distribution.
    • A novel branched DNA-RNA compound is synthesized in bacteria via reverse transcription, involving specific RNA-DNA linkages.
    • The biological significance and precise function of this bacterial reverse transcriptase and its associated DNA-RNA compound remain to be determined.