title: Pi sampling: a methodical and flexible approach to initial macromolecular crystallization screening.
abstract: The Pi sampling method is derived from the incomplete factorial approach to macromolecular crystallization screen design. The resulting `Pi screens' have a modular distribution of a given set of up to 36 stock solutions. Maximally diverse conditions can be produced by taking into account the properties of the chemicals used in the formulation and the concentrations of the corresponding solutions. The Pi sampling method has been implemented in a web-based application that generates screen formulations and recipes. It is particularly adapted to screens consisting of 96 different conditions. The flexibility and efficiency of Pi sampling is demonstrated by the crystallization of soluble proteins and of an integral membrane-protein sample.
authors.affiliation: MRC Laboratory of Molecular Biology, Hills Road, Cambridge CB20QH, England. fgorrec@mrc-lmb.cam.ac.uk
authors.forename: Fabrice
authors.initials: F
authors.lastname: Gorrec
authors.forename: Colin M
authors.initials: CM
authors.lastname: Palmer
authors.forename: Guillaume
authors.initials: G
authors.lastname: Lebon
authors.forename: Tony
authors.initials: T
authors.lastname: Warne
mesh_terms: D000465:Algorithms; D000818:Animals; D003460:Crystallization / Q000379:methods*; D006801:Humans; D008565:Membrane Proteins / Q000737:chemistry*; D043562:Receptors, G-Protein-Coupled / Q000737:chemistry; D012996:Solutions
chemical_list: D008565:Membrane Proteins; D043562:Receptors, G-Protein-Coupled; D012996:Solutions