title: Preliminary analysis of multiple crystal forms of the bovine cyclophilin-cyclosporin A complex.
abstract: The immunosuppressant cyclosporin-A (CsA) has been crystallized in complex with the bovine form of its major receptor protein cyclophilin (CyP) in three different forms by the hanging-drop vapor diffusion method. A hexagonal crystal form (P6(1)22 or P6(5)22; a = b = 110 A, c = 440 A) diffracts to 4 A resolution. Orthorhombic (P2(1)2(1)2(1) or P2(1)2(1)2; a = 154.3 A, b = 163.3 A, c = 94.7 A), and monoclinic (P2(1); a = 70.0 A, b = 162.5 A, c = 94.7, beta = 100.0 degrees) forms diffract to 2.2 A resolution. Self-rotation function analysis of the orthorhombic and monoclinic forms shows 52 point group local symmetry for both. A previously reported tetragonal crystal form of the complex also shares this local symmetry, suggesting that the observed motif may pre-exist in solution.
authors.affiliation: Vertex Pharmaceuticals Incorporated, Cambridge, MA 02139-4211.
authors.forename: S
authors.initials: S
authors.lastname: Itoh
authors.forename: M J
authors.initials: MJ
authors.lastname: Fitzgibbon
authors.forename: J R
authors.initials: JR
authors.lastname: Black
authors.forename: M A
authors.initials: MA
authors.lastname: Navia
mesh_terms: D000591:Amino Acid Isomerases / Q000648:ultrastructure*; D000818:Animals; D002352:Carrier Proteins / Q000648:ultrastructure*; D002417:Cattle; D018360:Crystallography, X-Ray; D016572:Cyclosporine; D046911:Macromolecular Substances; D019696:Peptidylprolyl Isomerase
chemical_list: D002352:Carrier Proteins; D046911:Macromolecular Substances; D016572:Cyclosporine; D000591:Amino Acid Isomerases; D019696:Peptidylprolyl Isomerase