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This study uses the AWSEM-membrane model to explore membrane protein oligomerization energy landscapes. Results show that higher-order assemblies resolve monomer folding ambiguities, revealing principles of minimal frustration in protein assembly.

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Area of Science:

  • Biophysics
  • Computational Biology
  • Structural Biology

Background:

  • Membrane protein oligomerization is crucial for cellular function.
  • Understanding the energy landscapes governing these processes is challenging.
  • Previous models assumed funneled energy landscapes for monomer folding.

Purpose of the Study:

  • To investigate the energy landscapes of membrane protein oligomerization.
  • To assess the capability of the AWSEM-membrane model in simulating these landscapes.
  • To elucidate the factors influencing the stability and assembly of membrane proteins.

Main Methods:

  • Utilized the Associative memory, Water mediated, Structure and Energy Model with an implicit membrane potential (AWSEM-membrane), a coarse-grained molecular dynamics model.
  • Employed simulated annealing to predict candidate structures of oligomeric membrane proteins.
  • Analyzed the folding and assembly pathways of specific systems like nicotinic acetylcholine receptor and V-type Na(+)-ATPase dimers.

Main Results:

  • The AWSEM-membrane force field successfully sampled near-native binding interfaces for several oligomeric systems.
  • Monomer structure prediction degeneracies were resolved upon formation of higher-order assemblies.
  • The observed phenomenon aligns with domain swapping and the principle of minimal frustration.
  • Revisiting bacteriorhodopsin reconstitution suggests the retinal cofactor significantly influences final assembly.

Conclusions:

  • The AWSEM-membrane model is effective for studying membrane protein oligomerization energy landscapes.
  • Oligomerization can resolve ambiguities in monomer folding, guided by principles of minimal frustration.
  • Cofactors like retinal play a critical role in the functional assembly of membrane proteins.