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Photo Mikael Lund

Mikael Lund

Professor

Photo Mikael Lund

Anisotropic protein-protein interactions in dilute and concentrated solutions

Author

  • Coralie Pasquier
  • Søren Roi Midtgaard
  • Marco Polimeni
  • Christian Isak Jørgensen
  • Lise Arleth
  • Thomas H. Callisen
  • Mikael Lund

Summary, in English

Interactions between biomolecules are ubiquitous in nature and crucial to many applications including vaccine development; environmentally friendly textile detergents; and food formulation. Using small angle X-ray scattering and structure-based molecular simulations, we explore protein–protein interactions in dilute to semi-concentrated protein solutions. We address the pertinent question, whether interaction models developed at infinite dilution can be extrapolated to concentrated regimes? Our analysis is based on measured and simulated osmotic second virial coefficients and solution structure factors at varying protein concentration and for different variants of the protein Thermomyces Lanuginosus Lipase (TLL). We show that in order to span the dilute and semi-concentrated regime, any model must carefully capture the balance between spatial and orientational correlations as the protein concentration is elevated. This requires consideration of the protein surface morphology, including possible patch interactions. Experimental data for TLL is most accurately described when assuming a patchy interaction, leading to dimer formation. Our analysis supports that the dimeric proteins predominantly exist in their open conformation where the active site is exposed, thereby maximising hydrophobic attractions that promote inter-protein alignment.

Department/s

  • Computational Chemistry
  • eSSENCE: The e-Science Collaboration

Publishing year

2023-01

Language

English

Pages

794-804

Publication/Series

Journal of Colloid and Interface Science

Volume

629

Document type

Journal article

Publisher

Academic Press

Topic

  • Biophysics
  • Physical Chemistry (including Surface- and Colloid Chemistry)

Keywords

  • Directional interactions
  • Molecular modelling
  • Protein–protein interactions
  • Small-Angle X-ray Scattering
  • Solution stability

Status

Published

ISBN/ISSN/Other

  • ISSN: 0021-9797