4avk | pdb_00004avk

Structure of trigonal FimH lectin domain crystal soaked with an alpha- D-mannoside O-linked to propynyl pyridine at 2.4A resolution

spinqualitylabelsall models 4avk, resolution 2.40Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4avk is a 2 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: FVQ, NI, SO4 Related: 4att, 4auj, 4auu, 4auy, 4av0, 4av4, 4av5, 4avh, 4avi, 4avj Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Uropathogenic Escherichia coli (UPEC) are the major causative agents of urinary tract infections. During infection, UPEC adhere to mannosylated glycoreceptors on the urothelium via the FimH adhesin located at the tip of type 1 pili. Synthetic FimH antiadhesives such as alkyl and phenyl alpha-d-mannopyranosides are thus ideal candidates for the chemical interception of this crucial step in pathogenesis. The crystal structures of the FimH lectin domain in its ligand-free form and in complexes with eight medium- and high-affinity mannopyranoside inhibitors are presented. The thermodynamic profiles of the FimH-inhibitor interactions indicate that the binding of FimH to alpha-d-mannopyranose is enthalpy-driven and has a negative entropic change. Addition of a hydrophobic aglycon influences the binding enthalpy and can induce a favorable entropic change. The alleviation of the entropic cost is at least in part explained by increased dynamics in the tyrosine gate (Tyr48 and Tyr137) of the FimH receptor-binding site upon binding of the ligand. Ligands with a phenyl group directly linked to the anomeric oxygen of alpha-d-mannose introduce the largest dynamics into the Tyr48 side chain, because conjugation with the anomeric oxygen of alpha-d-mannose forces the aromatic aglycon into a conformation that comes into close contact ( approximately 2.65 A) with Tyr48. A propargyl group in this position predetermines the orientation of the aglycon and significantly decreases affinity. FimH has the highest affinity for alpha-d-mannopyranosides substituted with hydrophobic aglycons that are compatible in shape and electrostatic properties to the tyrosine gate, such as heptyl alpha-d-mannose. The Tyrosine Gate as a Potential Entropic Lever in the Receptor-Binding Site of the Bacterial Adhesin FimH.,Wellens A, Lahmann M, Touaibia M, Vaucher J, Oscarson S, Roy R, Remaut H, Bouckaert J Biochemistry. 2012 Jun 7. PMID:22657089 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Adhesin 3D structures

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