title: Crystallization and preliminary X-ray diffraction studies of a monoclonal antibody Fab fragment against foot-and-mouth disease virus and of its complex with the main antigenic site peptide.
abstract: The Fab fragment of the neutralizing monoclonal antibody SD6 elicited against foot-and-mouth disease virus (FMDV) C-S8c1 and its complex with a peptide, corresponding to the major antigenic site of FMDV (VP1 residues 136-150, YTASARGDLAHLTTT), have been crystallized using the hanging drop vapor diffusion techniques. For the isolated Fab, crystals diffracting to 2.5 A resolution were obtained at room temperature using ammonium sulfate as precipitant. These crystals are monoclinic, space group C2, and unit cell parameters a = 109.53 A, b = 89.12 A, c = 64.04 A, and beta = 112.9 degrees and contain one Fab molecule per asymmetric unit. Crystals from the complex diffract, at least, to 2.8 A resolution and were obtained, at room temperature, using PEG as precipitant. These crystals are monoclinic, space group P2, and unit cell parameters a = 56.11 A, b = 60.67 A, c = 143.45 A, and beta = 95.4 degrees. Density packing considerations indicate that there are two Fab molecules in the asymmetric unit.
authors.affiliation: Departamento de Ingeniería Química, E.T.S.E.I.B., Universidad Politécnica de Cataluña, Barcelona, Spain.
authors.forename: N
authors.initials: N
authors.lastname: Verdaguer
authors.forename: M G
authors.initials: MG
authors.lastname: Mateu
authors.forename: J
authors.initials: J
authors.lastname: Bravo
authors.forename: J
authors.initials: J
authors.lastname: Tormo
authors.forename: E
authors.initials: E
authors.lastname: Giralt
authors.forename: D
authors.initials: D
authors.lastname: Andreu
authors.forename: E
authors.initials: E
authors.lastname: Domingo
authors.forename: I
authors.initials: I
authors.lastname: Fita
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000911:Antibodies, Monoclonal / Q000737:chemistry; D000914:Antibodies, Viral / Q000737:chemistry*; D000956:Antigens, Viral / Q000737:chemistry / Q000235:genetics; D005537:Aphthovirus / Q000737:chemistry / Q000235:genetics / Q000276:immunology*; D002213:Capsid / Q000737:chemistry / Q000235:genetics; D036022:Capsid Proteins; D018360:Crystallography, X-Ray; D007140:Immunoglobulin Fab Fragments / Q000737:chemistry; D051379:Mice; D008969:Molecular Sequence Data; D015394:Molecular Structure; D010446:Peptide Fragments / Q000737:chemistry / Q000235:genetics
chemical_list: D000911:Antibodies, Monoclonal; D000914:Antibodies, Viral; D000956:Antigens, Viral; D036022:Capsid Proteins; D007140:Immunoglobulin Fab Fragments; D010446:Peptide Fragments; C442501:VP1 protein, Foot-and-mouth disease virus