title: Analysis and prediction of protein quaternary structure.
abstract: The quaternary structure (QS) of a protein is determined by measuring its molecular weight in solution. The data have to be extracted from the literature, and they may be missing even for proteins that have a crystal structure reported in the Protein Data Bank (PDB). The PDB and other databases derived from it report QS information that either was obtained from the depositors or is based on an analysis of the contacts between polypeptide chains in the crystal, and this frequently differs from the QS determined in solution.The QS of a protein can be predicted from its sequence using either homology or threading methods. However, a majority of the proteins with less than 30% sequence identity have different QSs. A model of the QS can also be derived by docking the subunits when their 3D structure is independently known, but the model is likely to be incorrect if large conformation changes take place when the oligomer assembles.
authors.affiliation: Yeast Structural Genomics, IBBMC UMR 8619 CNRS, Université Paris-Sud, Orsay, France.
authors.forename: Anne
authors.initials: A
authors.lastname: Poupon
authors.forename: Joel
authors.initials: J
authors.lastname: Janin
mesh_terms: D000465:Algorithms; D000595:Amino Acid Sequence; D000818:Animals; D019295:Computational Biology; D017124:Conserved Sequence; D003460:Crystallization; D057225:Data Mining; D030562:Databases, Protein; D006801:Humans; D008958:Models, Molecular; D054730:Protein Interaction Domains and Motifs; D025941:Protein Interaction Mapping; D020836:Protein Structure, Quaternary; D011506:Proteins / Q000737:chemistry*; D015203:Reproducibility of Results; D020539:Sequence Analysis, Protein; D017386:Sequence Homology, Amino Acid; D013329:Structure-Activity Relationship
chemical_list: D011506:Proteins