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Related Experiment Videos

Direct observation of reverse transcriptases by scanning tunneling microscopy.

H J Lewerenz1, H Jungblut, S A Campbell

  • 1Hahn-Meitner-Institut, Bereich Photochemische Energieumwandlung, Berlin, Germany.

AIDS Research and Human Retroviruses
|September 1, 1992
PubMed
Summary

Scanning tunneling microscopy (STM) reveals nanometer-scale images of human immunodeficiency virus type 1 (HIV-1) and Moloney murine leukemia virus (MuLV) reverse transcriptases (RTs). These enzymes exhibit a consistent ring-like structure, validating STM for biomolecular imaging.

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Microscopy

Background:

  • Reverse transcriptases (RTs) are crucial enzymes in retroviral replication, including HIV-1.
  • Understanding RT structure is key to developing antiviral therapies.
  • Previous imaging techniques had limitations in resolving fine molecular details.

Purpose of the Study:

  • To obtain the first nanometer-scale images of HIV-1 and MuLV RTs using Scanning Tunneling Microscopy (STM).
  • To characterize the structural features of these enzymes at the nanoscale.
  • To assess the feasibility of STM for imaging biomolecules.

Main Methods:

  • Scanning Tunneling Microscopy (STM) was employed to image RT molecules.
  • High-resolution Transmission Electron Microscopy (TEM) was used for comparative analysis.

Related Experiment Videos

  • Existing structural predictions were utilized for validation.

    • Main Results:

    • STM successfully generated nanometer-scale images of both HIV-1 and MuLV RTs.
    • A consistent ring-type or horseshoe shape was observed for the RT molecules.
    • The observed structures showed good agreement with TEM data and structural predictions for HIV-1 RT.

    Conclusions:

    • STM provides a powerful new method for visualizing biomolecules like RTs at the nanoscale.
    • The observed structural features of RTs are consistent across different imaging techniques.
    • This study demonstrates the principal possibility of using STM for detailed biomolecular imaging.