Crystallographic and calorimetric analysis of peptide binding to OppA protein.Sleigh, S.H., Seavers, P.R., Wilkinson, A.J., Ladbury, J.E., Tame, J.R.
(1999) J.Mol.Biol. 291: 393-415
- PubMed: 10438628
- DOI: 10.1006/jmbi.1999.2929
- Primary Citation of Related Structures:
- PubMed Abstract:
- The Structural Basis of Sequence-Independent Peptide Binding by Oppa Protein
Tame, J.R.H.,Murshudov, G.N.,Dodson, E.J.,Neil, T.K.,Dodson, G.G.,Higgins, C.F.,Wilkinson, A.J.
(1994) Science 264: 1578
- The Crystal Structures of the Oligopeptide-Binding Protein Oppa Complexed with Tripeptide and Tetrapeptide Ligands
Tame, J.R.H.,Dodson, E.J.,Murshudov, G.,Higgins, C.F.,Wilkinson, A.J.
(1995) Structure 3: 1395
- The Role of Water in Sequence-Independent Ligand Binding by an Oligopeptide Transporter Protein
Tame, J.R.H.,Sleigh, S.H.,Wilkinson, A.J.,Ladbury, J.E.
(1996) Nat.Struct.Mol.Biol. 3: 998
- Structure Determination of Oppa at 2.3 Angstroms Resolution Using Multiple Wavelength Anomalous Methods
Glover, I.D.,Denny, R.,Nguti, N.D.,McSweeney, S.,Thompson, A.,Dodson, E.,Wilkinson, A.J.,Tame, J.R.H.
(1995) Acta Crystallogr.,Sect.D 51: 39
Isothermal titration calorimetry has been used to study the binding of 20 different peptides to the peptide binding protein OppA, and the crystal structures of the ligand complexes have been refined. This periplasmic binding protein, part of the olig ...
Isothermal titration calorimetry has been used to study the binding of 20 different peptides to the peptide binding protein OppA, and the crystal structures of the ligand complexes have been refined. This periplasmic binding protein, part of the oligopeptide permease system of Gram negative bacteria, has evolved to bind and enclose small peptides of widely varying sequences. The peptides used in this study have the sequence Lys-X-Lys, where X is any of the 20 commonly occurring amino acids. The various side-chains found at position 2 on the ligand fit into a hydrated pocket. The majority of side-chains are restrained to particular conformations within the pocket. Water molecules act as flexible adapters, matching the hydrogen-bonding requirements of the protein and ligand and shielding charges on the buried ligand. This use of water by OppA to broaden the repertoire of its binding site is not unique, but contrasts sharply with other proteins which use water to help bind ligands highly selectively. Predicting the thermodynamics of binding from the structure of the complexes is highly complicated by the influence of water on the system.
Structural Biology Centre Department of Chemistry, University of York, York, YO10 5DD, UK.