Download MendeleyRecognition of a cell-surface oligosaccharide of pathogenic Salmonella by an antibody Fab fragment.
Cygler, M., Rose, D.R., Bundle, D.R.(1991) Science 253: 442-445
- PubMed: 1713710
- DOI: https://doi.org/10.1126/science.1713710
- Primary Citation of Related Structures:
1MFE - PubMed Abstract:
The 2.05 angstrom (A) resolution crystal structure of a dodecasaccharide-Fab complex revealed an unusual carbohydrate recognition site, defined by aromatic amino acids and a structured water molecule, rather than the carboxylic acid and amide side chains and a structured water molecule, rather than the carboxylic acid and amide side chains that are features of transport and other carbohydrate binding proteins. A trisaccharide epitope of a branched bacterial lipopolysaccharide fills this hydrophobic pocket (8 A deep by 7 A wide) in an entropy-assisted association (association constant = 2.05 x 10(5) liters per mole, enthalpy = -20.5 +/- 1.7 kilojoules per mole, and temperature times entropy = +10.0 +/- 2.9 kilojoules per mole). The requirement for the complementarity of van der Waals surfaces and the requirements of saccharide-saccharide and protein-saccharide hydrogen-bonding networks determine the antigen conformation adopted in the bound state.
Organizational Affiliation:
Biotechnology Research Institute, National Research Council of Canada, Montréal, Québec.
