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Related Experiment Videos

Membrane peptides and their role in protobiological evolution.

Andrew Pohorille1, Michael A Wilson, Christophe Chipot

  • 1Exobiology Branch, NASA Ames Research Center, Moffett Field, CA 94035, USA.

Origins of Life and Evolution of the Biosphere : the Journal of the International Society for the Study of the Origin of Life
|September 12, 2003
PubMed
Summary

Simple membrane peptides likely performed early cell functions. Molecular simulations reveal how peptides fold, insert into membranes, and self-assemble into functional structures, suggesting integral membrane proteins could easily emerge.

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Area of Science:

  • Biophysics
  • Origin of Life Research
  • Computational Biology

Background:

  • Understanding how simple peptides acquired essential protocellular functions (transport, energy capture, signal transduction) is crucial for evolutionary biology.
  • The emergence of integral membrane proteins is a key, yet poorly understood, step in the origin of life.

Purpose of the Study:

  • To explain, using molecular-level computer simulations, how simple membrane peptides fold, insert, and self-assemble into functional structures at water-membrane interfaces.
  • To investigate the feasibility of integral membrane protein emergence in early protocells.

Main Methods:

  • Detailed, molecular-level computer simulations of peptide behavior at water-membrane interfaces.
  • Analysis of interfacial behavior, folding, and insertion of leucine- and glutamine-based peptides.

Related Experiment Videos

  • Simulation of alpha-helical peptide insertion and dimer formation within a model membrane.

    • Main Results:

    • Identified specific peptides that adopt ordered structures at water-membrane interfaces.
    • Quantified the energy barrier for alpha-helical peptide insertion into a model membrane.
    • Demonstrated that favorable helix association can drive peptide self-assembly in membranes, forming functional structures like proton channels.

    Conclusions:

    • Simple peptides can self-assemble into functional membrane structures, supporting essential protocellular functions.
    • The emergence of integral membrane proteins is a plausible and potentially less challenging event in early evolution than the emergence of water-soluble proteins.