A model of protein association based on their hydrophobic and electric interactions
Mozo-Villarias, Angel (Institut de Recerca Biomèdica de Lleida)
Cedano Rodríguez, Juan Antonio (Universidad de la República (Uruguai). Laboratorio de Inmunologia)
Querol Murillo, Enrique (Universitat Autònoma de Barcelona. Institut de Biotecnologia i de Biomedicina "Vicent Villar Palasí")

Date:	2014
Abstract:	The propensity of many proteins to oligomerize and associate to form complex structures from their constituent monomers, is analyzed in terms of their hydrophobic (H), and electric pseudo-dipole (D) moment vectors. In both cases these vectors are defined as the product of the distance between their positive and negative centroids, times the total hydrophobicity or total positive charge of the protein. Changes in the magnitudes and directions of H and D are studied as monomers associate to form larger complexes. We use these descriptors to study similarities and differences in two groups of associations: a) open associations such as polymers with an undefined number of monomers (i. e. actin polymerization, amyloid and HIV capsid assemblies); b) closed symmetrical associations of finite size, like spherical virus capsids and protein cages. The tendency of the hydrophobic moments of the monomers in an association is to align in parallel arrangements following a pattern similar to those of phospholipids in a membrane. Conversely, electric dipole moments of monomers tend to align in antiparallel associations. The final conformation of a given assembly is a fine-tuned combination of these forces, limited by steric constraints. This determines whether the association will be open (indetermined number of monomers) or closed (fixed number of monomers). Any kinetic, binding or molecular peculiarities that characterize a protein assembly, comply with the vector rules laid down in this paper. These findings are also independent of protein size and shape.
Grants:	Ministerio de Ciencia y Tecnología BIO2013-48704-R
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Actins ; Capsid ; Electromagnetic phenomena ; Hydrophobic and hydrophilic interactions ; Membrane proteins ; Models, Molecular ; Multiprotein complexes ; Polymers ; Protein conformation ; Protein interaction maps ; Superoxide dismutase ; Viral matrix proteins
Published in:	PloS one, Vol. 9 issue 10 (2014) , art. e110352, ISSN 1932-6203

DOI: 10.1371/journal.pone.0110352
PMID: 25329830

15 p, 1.8 MB

The record appears in these collections:
Research literature > UAB research groups literature > Research Centres and Groups (research output) > Health sciences and biosciences > Institut de Biotecnologia i de Biomedicina (IBB)
Articles > Research articles
Articles > Published articles