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Comparative Pore Structure and Dynamics for Bacterial Microcompartment Shell Protein Assemblies in Sheets or Shells.

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Bacterial microcompartments (BMCs) have protein shells that form flat sheets or curved structures. Molecular modeling shows pore shapes and water interactions are similar in both morphologies, suggesting interchangeable use for permeability studies.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Microbiology

Background:

  • Bacterial microcompartments (BMCs) are protein-bound organelles that enhance enzyme catalysis.
  • Their semipermeable protein shells regulate molecular transport.
  • Shells assemble from multimeric tiles (hexamers, trimers, pentamers) into icosahedral structures, but can also form planar sheets or cylinders.

Purpose of the Study:

  • To quantify nanoscale pore shape changes in bacterial microcompartment (BMC) shell proteins.
  • To investigate the impact of different protein tile morphologies (planar sheets vs. curved shells) on pore structure and function.
  • To compare simulation results with experimental data for validation.

Main Methods:

  • Atomically detailed molecular modeling of planar and curved BMC shell structures.
  • Classical molecular dynamics simulations to animate models.
  • Analysis of structural stability, water accessibility, water residence time, and pore geometry.
  • Comparison with hydroxyl radical footprinting data.

Main Results:

  • No substantial variation in pore structure or water accessibility between flat and curved BMC shell geometries.
  • Identified specific residues with long water molecule residence times.
  • Simulation results align with hydroxyl radical footprinting data.

Conclusions:

  • Planar and curved BMC shell morphologies exhibit similar pore characteristics and water interactions.
  • These morphologies can be used interchangeably when studying BMC pore permeability.
  • Provides insights into the structural plasticity and functional consistency of BMC shells.