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Building blocks of protein structures: Physics meets biology.

Tatjana Škrbić1,2, Amos Maritan3, Achille Giacometti2,4

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Protein structures derive their geometry from fundamental physics and mathematics, not just amino acid sequences. This principle of discreteness in protein folding may inform artificial life creation.

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Area of Science:

  • Biophysics
  • Structural Biology
  • Astrobiology

Background:

  • Globular proteins in their native states are stable and well-packed.
  • Protein self-interactions are favored over protein-solvent interactions during folding.

Purpose of the Study:

  • To derive the geometry of protein building blocks (alpha-helices and beta-sheets) using fundamental principles.
  • To explore sequence-independent platforms in protein evolution.

Main Methods:

  • Utilized the principle that self-interactions dominate under folding conditions.
  • Derived protein structure geometry based on mathematics and physics, without adjustable parameters, sequence information, or chemistry.

Main Results:

  • Demonstrated a strong agreement between mathematical/physical dictates and quantum chemistry rules for protein structures.
  • Identified sequence-independent platforms as facilitators of protein evolution.
  • Highlighted the significance of discreteness in biological systems.

Conclusions:

  • Protein structure geometry can be explained by fundamental physical and mathematical laws.
  • This understanding has implications for creating artificial life and understanding extraterrestrial life.