Crystals of Phosphorylcholine-Binding Fab-Fragments from Mouse Myeloma Proteins: Preparation and X-Ray Analysis
AUTOR(ES)
Rudikoff, Stuart
RESUMO
Fab-fragments of several phosphorylcholine-binding mouse-myeloma proteins have been prepared by pepsin digestion; two of these, MOPC 167 and McPC 603, gave large crystals from ammonium sulfate solutions. The Fab-fragment from MOPC 167 crystallizes in a hexagonal space group, but does not diffract to a resolution greater than about 8 Å. In contrast, McPC 603 crystals (space group P63) diffract to about 2.7 Å. An isotopic double-labeling technique was developed that demonstrated that the 603 crystals bind 1 mol of hapten per mol of Fab-fragment, but with a binding constant significantly lower than that observed in solution. The findings indicate that a three-dimensional model of this homogeneous antigen-binding immunoglobulin can be constructed. Accordingly, a search for heavy-atom derivatives and determination of the primary structure are in progress.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=389850Documentos Relacionados
- Structure-function relations in phosphorylcholine-binding mouse myeloma proteins.
- Size differences among immunoglobulin heavy chains from phosphorylcholine-binding proteins.
- The Three-Dimensional Structure of a Phosphorylcholine-Binding Mouse Immunoglobulin Fab and the Nature of the Antigen Binding Site
- X-ray Laue diffraction from crystals of xylose isomerase.
- Three-dimensional diffuse x-ray scattering from crystals of Staphylococcal nuclease