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Optimization of Crystal Growth for Neutron Macromolecular Crystallography
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Published on: March 13, 2021

Metastable mesoscopic phases in concentrated protein solutions.

Peter G Vekilov1

  • 1Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204, USA. vekilov@uh.edu

Annals of the New York Academy of Sciences
|May 12, 2009
PubMed
Summary

Protein solutions exhibit nanoscale clusters, challenging traditional phase definitions. These dynamic structures influence solution properties and protein aggregation, suggesting an intrinsic tendency for mesoscopic organization.

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Area of Science:

  • Biophysics
  • Physical Chemistry
  • Materials Science

Background:

  • Traditional phase definitions assume complete homogeneity, with minimal composition fluctuations.
  • Protein solutions, even at moderate concentrations, may deviate from this idealized model.
  • Understanding protein solution behavior is crucial for fields ranging from drug development to cellular biology.

Purpose of the Study:

  • To investigate the structural characteristics of single protein solutions beyond the Gibbs definition of a phase.
  • To determine if protein solutions exhibit non-homogeneous structures.
  • To explore the implications of these structures on solution properties and protein behavior.

Main Methods:

  • Light scattering techniques were employed to probe solution structure.
  • Atomic force microscopy (AFM) provided high-resolution imaging of protein assemblies.
  • Additional unspecified techniques were used to corroborate findings.

Main Results:

  • Solutions of single proteins contain dynamic clusters ranging from tens to hundreds of nanometers.
  • These clusters possess higher free energy and limited lifetimes, governed by decay barriers.
  • The presence and behavior of these clusters influence solution viscosity and viscoelasticity.

Conclusions:

  • Proteins exhibit an intrinsic propensity to form mesoscopic structures, relevant to complex formation in vivo.
  • Cluster formation kinetics, not thermodynamics, likely dictates their size.
  • Existing colloid theories are inadequate for protein systems due to electrostatic interactions.