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Parallel stranded DNA under the scanning tunnelling microscope.

J D Zhu1, M Q Li, L Z Xiu

  • 1Shanghai Institute of Cell Biology, Shanghai Open Laboratory of Life Sciences, China.

Biochimica Et Biophysica Acta
|January 23, 1992
PubMed
Summary
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Researchers directly observed parallel stranded DNA, a right-handed double helix 43 nucleotides long. This finding provides direct evidence for parallel DNA structures in vitro and details their fine structure.

Area of Science:

  • Molecular Biology
  • Biophysics

Background:

  • The canonical DNA structure is the antiparallel double helix.
  • Parallel stranded DNA structures have been proposed but lacked direct experimental evidence.

Purpose of the Study:

  • To provide direct experimental evidence for the existence of parallel stranded DNA.
  • To characterize the fine structure of observed parallel DNA helices.

Main Methods:

  • Scanning Tunneling Microscopy (STM) was employed to visualize DNA structures at high resolution.

Main Results:

  • Direct observation of parallel stranded DNA helices, 43 nucleotides in length.
  • Characterization of helical parameters: average spacing (17.43 Å), groove depth (4.79 Å), pitch (34 Å), and diameter (17-20 Å).

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  • The observed helix is right-handed and consists of approximately ten base pairs per helical turn.

    • Conclusions:

    • Provides the first direct experimental evidence for parallel stranded DNA in vitro.
    • Offers detailed insights into the structural parameters of this non-canonical DNA conformation.