title: Multiprotein interactions during surface adsorption: a molecular dynamics study of lysozyme aggregation at a charged solid surface.
abstract: Multiprotein adsorption of hen egg white lysozyme at a model charged ionic surface is studied using fully atomistic molecular dynamics simulations. Simulations with two, three, and five proteins, in various orientations with respect the surface, are performed over a 100 ns time scale. Mutated proteins with point mutations at the major (Arg128 and Arg125) and minor (Arg68) surface adsorption sites are also studied. The 100 ns time scale used is sufficient to observe protein translations, rotations, adsorption, and aggregation. Two competing processes of particular interest are observed, namely surface adsorption and protein-protein aggregation. At low protein concentration, the proteins first adsorb in isolation and can then reorientate on the surface to aggregate. At high concentration, the proteins aggregate in the solution and then adsorb in nonspecific ways. This work demonstrates the role of protein concentration in adsorption, indicates the residues involved in both types of interaction (protein-protein and protein-surface), and gives an insight into processes to be considered in the development of new functionalized material systems.
authors.affiliation: Department of Chemical and Process Engineering, University of Strathclyde, James Weir Building, 75 Montrose Street, Glasgow G1 1XJ, United Kingdom.
authors.forename: Karina
authors.initials: K
authors.lastname: Kubiak-Ossowska
authors.forename: Paul A
authors.initials: PA
authors.lastname: Mulheran
mesh_terms: D000327:Adsorption; D000818:Animals; D001665:Binding Sites; D002645:Chickens; D002942:Circular Dichroism; D019281:Dimerization; D008958:Models, Molecular; D056004:Molecular Dynamics Simulation; D009113:Muramidase / Q000737:chemistry*; D013499:Surface Properties
chemical_list: C421864:hen egg lysozyme; D009113:Muramidase