Beyond the excluded volume effects: mechanistic complexity of the crowded milieu

Molecules. 2015 Jan 14;20(1):1377-409. doi: 10.3390/molecules20011377.

Abstract

Macromolecular crowding is known to affect protein folding, binding of small molecules, interaction with nucleic acids, enzymatic activity, protein-protein interactions, and protein aggregation. Although for a long time it was believed that the major mechanism of the action of crowded environments on structure, folding, thermodynamics, and function of a protein can be described in terms of the excluded volume effects, it is getting clear now that other factors originating from the presence of high concentrations of "inert" macromolecules in crowded solution should definitely be taken into account to draw a more complete picture of a protein in a crowded milieu. This review shows that in addition to the excluded volume effects important players of the crowded environments are viscosity, perturbed diffusion, direct physical interactions between the crowding agents and proteins, soft interactions, and, most importantly, the effects of crowders on solvent properties.

Publication types

  • Research Support, Non-U.S. Gov't
  • Review

MeSH terms

  • Macromolecular Substances / chemistry*
  • Protein Conformation
  • Protein Folding
  • Thermodynamics

Substances

  • Macromolecular Substances