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Protein-Protein Interfaces in Viral Capsids Are Structurally Unique.

Shanshan Cheng1, Charles L Brooks2

  • 1Department of Computational Medicine and Bioinformatics, University of Michigan Medical School, Ann Arbor, MI 48109-2218, USA.

Journal of Molecular Biology
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PubMed
Summary

Viral capsid protein interactions are distinct from cellular complexes, highlighting unique assembly principles for large biological containers and informing antiviral drug design.

Keywords:
biological containerscapsid shellsdrug specificityprotein–protein interactionstructural comparison

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Area of Science:

  • Structural biology
  • Virology
  • Biophysics

Background:

  • Viral capsids possess unique, large, and mechanically robust symmetrical architectures.
  • The organization of viral capsid proteins differs from typical cellular macromolecular complexes.

Purpose of the Study:

  • To investigate if protein-protein interaction patterns in viral capsids are distinct from those in generic protein complexes.
  • To understand the design principles of viral capsid assembly and identify potential antiviral drug targets.

Main Methods:

  • Comparative analysis of 551 viral capsid interfaces (VIPERdb) and 20,014 non-capsid protein interfaces (PDB).
  • Utilized the developed PCalign program to compare physicochemical patterns of protein-protein interfaces.
  • Statistical analysis using permutation testing to assess the significance of interface overlap.

Main Results:

  • A significantly small overlap (p-value <0.0001) was found between viral capsid interfaces and generic protein interfaces.
  • Similar interfaces were predominantly small (<20 residues) in generic complexes, suggesting limited design options rather than functional relationships.
  • Viral capsid interfaces are non-representative of patterns found in smaller, compact cellular protein complexes.

Conclusions:

  • Viral capsids employ distinct protein-protein interaction patterns compared to cellular complexes.
  • This distinctness reflects a design principle for constructing large biological containers from self-assembling units.
  • Findings offer insights for developing targeted antiviral drugs with enhanced efficacy.