title: Analysis of an anti-progesterone antibody: variable crystal morphology of the Fab' and steroid-Fab' complexes.
abstract: Anti-progesterone monoclonal antibodies are being used for structural studies of antibody-antigen interaction, for their ability to block pregnancy shortly after fertilization, and for hormone immunoassay. A mouse anti-progesterone monoclonal Fab' fragment has been crystallized in its native form and co-crystallized with seven different, but structurally related, steroids. The crystals show interesting preferences in their crystal morphology, depending on the bound steroid ligand. The X-ray crystallographic analysis of this Fab', complexed with a series of related steroid ligands, should reveal details of the chemistry of antibody-antigen union and provide insights into how steroids interact with proteins.
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology; D000936:Antigen-Antibody Complex; D001483:Base Sequence; D055598:Chemical Phenomena; D002621:Chemistry; D003460:Crystallization; D007140:Immunoglobulin Fab Fragments; D007143:Immunoglobulin Heavy Chains; D007147:Immunoglobulin Light Chains; D007135:Immunoglobulin Variable Region; D051379:Mice; D008807:Mice, Inbred BALB C; D008969:Molecular Sequence Data; D011374:Progesterone / Q000276:immunology*; D014961:X-Ray Diffraction
chemical_list: D000911:Antibodies, Monoclonal; D000936:Antigen-Antibody Complex; D007140:Immunoglobulin Fab Fragments; D007143:Immunoglobulin Heavy Chains; D007147:Immunoglobulin Light Chains; D007135:Immunoglobulin Variable Region; D011374:Progesterone