Sugar-binding and crystallographic studies of an arabinose-binding protein mutant (Met108Leu) that exhibits enhanced affinity and altered specificity.Vermersch, P.S., Lemon, D.D., Tesmer, J.J., Quiocho, F.A.
(1991) Biochemistry 30: 6861-6866
- PubMed: 2069949
- Primary Citation of Related Structures:
- PubMed Abstract:
- Location of the Sugar-Binding Site of L-Arabinose-Binding Protein. Sugar Derivative Syntheses, Sugar Binding Specificity, and Difference Fourier Analyses
Newcomer, M.E.,Miller /III, D.M.,Quiocho, F.A.
(1979) J.Biol.Chem. 254: 7529
- The Thiol Group of the L-Arabinose-Binding Protein. Chromophoric Labeling and Chemical Identification of the Sugar-Binding Site
Miller /III, D.M.,Newcomer, M.E.,Quiocho, F.A.
(1979) J.Biol.Chem. 254: 7521
- Structure of L-Arabinose-Binding Protein from Escherichia Coli at 5 Angstroms Resolution and Preliminary Results at 3.5 Angstroms
Phillips Jr., G.N.,Mahajan, V.K.,Siu, A.K.Q.,Quiocho, F.A.
(1976) Proc.Natl.Acad.Sci.USA 73: 2186
- Novel Stereospecificity of the L-Arabinose-Binding Protein
Quiocho, F.A.,Vyas, N.K.
(1984) Nature 310: 381
- Substrate Specificity and Affinity of a Protein Modulated by Bound Water Molecules
Quiocho, F.A.,Wilson, D.K.,Vyas, N.K.
(1989) Nature 340: 404
- The 2.8-Angstroms Resolution Structure of the L-Arabinose-Binding Protein from Escherichia Coli
Quiocho, F.A.,Gilliland, G.L.,Phillips Jr., G.N.
(1977) J.Biol.Chem. 252: 5142
- Hinge-Bending in L-Arabinose-Binding Protein. The "Venus'S-Flytrap" Model
Mao, B.,Pear, M.R.,Mccammon, J.A.,Quiocho, F.A.
(1982) J.Biol.Chem. 257: 1131
- The Radius of Gyration of L-Arabinose-Binding Protein Decreases Upon Binding of Ligand
Newcomer, M.E.,Lewis, B.A.,Quiocho, F.A.
(1981) J.Biol.Chem. 256: 13218
- Structure of the L-Arabinose-Binding Protein from Escherichia Coli at 2.4 Angstroms Resolution
Gilliland, G.L.,Quiocho, F.A.
(1981) J.Mol.Biol. 146: 341
- L-Arabinose-Binding Protein-Sugar Complex at 2.4 Angstroms Resolution. Stereochemistry and Evidence for a Structural Change
Newcomer, M.E.,Gilliand, G.L.,Quiocho, F.A.
(1981) J.Biol.Chem. 256: 13213
In addition to hydrogen bonds, van der Waals forces contribute to the affinity of protein-carbohydrate interactions. Nonpolar van der Waals contacts in the complexes of the L-arabinose-binding protein (ABP) with monosaccharides have been studied by m ...
In addition to hydrogen bonds, van der Waals forces contribute to the affinity of protein-carbohydrate interactions. Nonpolar van der Waals contacts in the complexes of the L-arabinose-binding protein (ABP) with monosaccharides have been studied by means of site-directed mutagenesis, equilibrium and rapid kinetic binding techniques, and X-ray crystallography. ABP, a periplasmic transport receptor of Escherichia coli, binds L-arabinose, D-galactose, and D-fucose with preferential affinity in the order of Ara greater than Gal much greater than Fuc. Well-refined, high-resolution structures of ABP complexed with the three sugars revealed that the structural differences in the ABP-sugar complexes are localized around C5 of the sugars, where the equatorial H of Ara has been substituted for CH3 (Fuc) or CH2OH (Gal). The side chain of Met108 undergoes a sterically dictated, ligand-specific, conformational change to optimize nonpolar interactions between its methyl group and the sugar. We found that the Met108Leu ABP binds Gal tighter than wild-type ABP binds Ara and exhibits a preference for ligand in the order of Gal much greater than Fuc greater than Ara. The differences in affinity can be attributed to differences in the dissociation rates of the ABP-sugar complexes. We have refined at better than 1.7-A resolution the crystal structures of the Met108Leu ABP complexed with each of the sugars and offer a molecular explanation for the altered binding properties.
Howard Hughes Medical Institute Baylor College of Medicine, Houston, Texas 77030.