title: Prediction of beta-sheet topology and disulfide bridges in polypeptides.
abstract: An ab initio method has been developed to predict beta architectures in polypeptides. The approach predicts the topology of beta-sheets and disulfide bridges through a novel superstructure-based mathematical framework originally established for chemical process synthesis problems. Two types of superstructure are introduced, both of which emanate from the principle that hydrophobic interactions drive the formation of a beta-structure. The mathematical formulation of the problem results in a set of integer linear programming (ILP) problems that can be solved to global optimality to identify the optimal beta-configuration. These (ILP) models can also predict a ranked ordered list of the best, second-best, third-best, etc., topologies of beta-sheets and disulfide bridges. The approach is shown to perform very well for several benchmark polypeptide systems, as well as polypeptides exhibiting challenging nonsequential beta-sheet topologies folds (56 to 187 amino acids).
authors.affiliation: Department of Chemical Engineering, Princeton University, Princeton, New Jersey 08544-5263, USA.
authors.forename: J L
authors.initials: JL
authors.lastname: Klepeis
authors.forename: C A
authors.initials: CA
authors.lastname: Floudas
mesh_terms: D000465:Algorithms; D000595:Amino Acid Sequence; D001665:Binding Sites; D003198:Computer Simulation; D004220:Disulfides; D008958:Models, Molecular; D017510:Protein Folding; D017433:Protein Structure, Secondary
chemical_list: D004220:Disulfides