title: Preparation, crystallization and preliminary X-ray analysis of the Fab fragment of monoclonal antibody MN423, revealing the structural aspects of Alzheimer's paired helical filaments.
abstract: Monoclonal antibody (mAb) MN423 recognizes Alzheimer's disease specific conformation of tau protein assembled into paired helical filaments (PHF). Since the three-dimensional structure of PHF is currently unavailable, the structure of MN423 binding site could provide important information about PHF conformation with the consequences for the Alzheimer's disease prevention and cure. Fab fragment of MN423 was prepared and purified. We have identified two different conditions for crystallization of the Fab fragment that yielded two crystal forms. They diffracted to 3.0 and 1.6 A resolution with four and one molecule in the asymmetric unit, respectively. Both crystal forms belonged to the space group P2(1) with unit cell parameters a = 76.4 A, b = 138.4 A, c = 92.4 A, beta = 101.9 degrees , and a = 71.5 A, b = 36.8 A, c = 85.5 A, beta = 113.9 degrees .
authors.affiliation: Institute of Neuroimmunology, Slovak Academy of Sciences, Dubravska cesta 9, 845 10 Bratislava, Slovakia.
authors.forename: Natália
authors.initials: N
authors.lastname: Csóková
authors.forename: Rostislav
authors.initials: R
authors.lastname: Skrabana
authors.forename: L'ubica
authors.initials: L
authors.lastname: Urbániková
authors.forename: Branislav
authors.initials: B
authors.lastname: Kovácech
authors.forename: Alexander
authors.initials: A
authors.lastname: Popov
authors.forename: Jozef
authors.initials: J
authors.lastname: Sevcík
authors.forename: Michal
authors.initials: M
authors.lastname: Novák
mesh_terms: D000544:Alzheimer Disease; D000911:Antibodies, Monoclonal / Q000737:chemistry*; D001665:Binding Sites; D003460:Crystallization; D018360:Crystallography, X-Ray; D000939:Epitopes; D006801:Humans; D007140:Immunoglobulin Fab Fragments / Q000737:chemistry*; D008969:Molecular Sequence Data; D011487:Protein Conformation; D016875:tau Proteins / Q000737:chemistry* / Q000235:genetics / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D000939:Epitopes; D007140:Immunoglobulin Fab Fragments; D016875:tau Proteins