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Related Experiment Videos

Structure, function, and evolution of bacterial reverse transcriptase

S Inouye1, M Inouye

  • 1Department of Biochemistry, Robert Wood Johnson Medical School, Piscataway, NJ 08854-5635, USA.

Virus Genes
|January 1, 1995
PubMed
Summary
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Bacterial retroelements, called retrons, produce unique multicopy single-stranded DNA (msDNA) via reverse transcriptase. Their structure, mobility, and evolutionary origins are explored, questioning if bacterial reverse transcriptases predate eukaryotic ones.

Area of Science:

  • Molecular Biology
  • Evolutionary Biology
  • Genetics

Background:

  • Retroelements are found in prokaryotes, raising questions about their function and the origin of reverse transcriptases.
  • Bacterial reverse transcriptases may share structural similarities with eukaryotic counterparts like HIV-1 reverse transcriptase.

Purpose of the Study:

  • To investigate the structure and function of bacterial reverse transcriptases.
  • To analyze the mobility of bacterial retroelements (retrons) and compare them to introns.
  • To explore the evolutionary origins of bacterial reverse transcriptases in relation to eukaryotic ones.

Main Methods:

  • Comparative structural analysis of bacterial and viral reverse transcriptases.
  • Examination of the mechanism for multicopy single-stranded DNA (msDNA) production.

Related Experiment Videos

  • Comparative analysis of retroelement and intron mobility.

    • Main Results:

    • A putative structure for bacterial reverse transcriptases is proposed, explaining their recognition of RNA templates and initiation of DNA synthesis.
    • The reaction produces a unique msDNA-RNA complex with a 2',5'-phosphodiester linkage.
    • Retrons exhibit mobility characteristics comparable to group I and group II introns.

    Conclusions:

    • Bacterial reverse transcriptases play a role in msDNA production and share mechanistic similarities with eukaryotic enzymes.
    • The mobility of retrons suggests a conserved mechanism for mobile genetic elements.
    • The study provides insights into the ancient origins and evolution of reverse transcriptases in both prokaryotes and eukaryotes.