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Snake cube puzzle and protein folding.

Nobuhiro Go1

  • 1Kyoto University, Professor Emeritus, Kyoto 606-8187, Japan.

Biophysics and Physicobiology
|January 28, 2020
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The snake cube puzzle models reveal that geometric properties, not just hydrophobic interactions, determine protein folding uniqueness. Combining these factors enhances the consistency principle for sequence-specific protein structures.

Keywords:
geometrical varieties of amino acid residueshydrophobic interactionslattice model of proteinsequence determination of the native structurethe consistency principle

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Area of Science:

  • Computational Biology
  • Biophysics
  • Protein Folding Dynamics

Background:

  • Protein folding into specific 3D structures is crucial for biological function.
  • Understanding the sequence-structure relationship remains a key challenge in molecular biology.
  • The snake cube puzzle serves as a theoretical model for protein folding mechanisms.

Purpose of the Study:

  • To investigate the factors governing the uniqueness of protein folding.
  • To compare the influence of geometric properties versus hydrophobic interactions in folding.
  • To explore the consistency principle in protein structure determination.

Main Methods:

  • Utilizing three versions of the snake cube puzzle as theoretical models.
  • Analyzing sequences of cube characteristics and their folding into a 3x3x3 structure.
  • Comparing the folding outcomes based on different model parameters.

Main Results:

  • Only a fraction of sequences in all models fold into a compact cube.
  • Folded structures are not always uniquely determined by the sequence.
  • Geometric properties of cubes are more influential in determining unique structures than hydrophobic interactions alone.

Conclusions:

  • Hydrophobic interactions have limited power in making folded protein structures unique to their sequence.
  • Compounding geometric and hydrophobic attributes significantly enhances structural uniqueness.
  • Protein structure specificity arises from the consistent interplay of various interaction types.