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Related Experiment Videos

Self-programmable, self-assembling two-dimensional genetic matter.

S J Sowerby1, P A Stockwell, W M Heckl

  • 1Department of Biochemistry and Centre for Gene Research, University of Otago, Dunedin, New Zealand. sowerby@sanger.otago.ac.nz

Origins of Life and Evolution of the Biosphere : the Journal of the International Society for the Study of the Origin of Life
|June 3, 2000
PubMed
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Researchers created 2D coding systems using nucleic acid bases on solid surfaces. These self-assembled monolayers, observed via scanning tunnelling microscopy, show potential for primitive genetic mechanisms and understanding life's origins.

Area of Science:

  • Biochemistry
  • Materials Science
  • Astrobiology

Background:

  • Molecular self-assembly is crucial for forming complex structures.
  • Nucleic acid bases are fundamental building blocks of life.
  • Understanding early life origins requires investigating potential primitive genetic mechanisms.

Purpose of the Study:

  • To construct and characterize two-dimensional (2D) coding systems from purine and pyrimidine bases.
  • To investigate the self-assembly of these bases into monolayers on inorganic solids.
  • To explore the potential of these structures as primitive genetic mechanisms relevant to the origin of life.

Main Methods:

  • Aqueous solutions of purine and pyrimidine nucleic acid bases were evaporated on inorganic solid surfaces.

Related Experiment Videos

  • Resultant monolayers were analyzed using scanning tunnelling microscopy (STM) at molecular resolution.
  • Structural analysis focused on crystalline and aperiodic arrangements formed by single bases and mixtures.

    • Main Results:

    • Spontaneous formation of monolayers via molecular self-assembly was observed.
    • Single-base monolayers (adenine, uracil) exhibited crystalline structures with intermolecular hydrogen bonding.
    • Mixed-base monolayers showed aperiodic structures with interpretable crystalline domains and various hydrogen bonding interactions.

    Conclusions:

    • The study demonstrates the feasibility of creating 2D coding systems from nucleic acid bases.
    • Combinatorial arrangements of bases in monolayers offer complexity relevant to primitive genetics.
    • These findings suggest a potential pathway for the origin of life through molecular self-assembly.