4ywa

Structural Insight into Divalent Galactoside Binding to Pseudomonas aeruginosa lectin LecA

spinqualitylabelsall models 4ywa, resolution 1.19Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4ywa is a 4 chain structure with sequence from Pseudomonas aeruginosa. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.192Å Ligands: 4J9, CA Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function PA1L_PSEAE D-galactose specific lectin. Binds in decreasing order of affinity: melibiose, methyl-alpha-D-galactoside, D-galactose, methyl-beta-D-galactoside, N-acetyl-D-galactosamine. Similar to plant lectins in its selective (carbohydrate-specific) hemagglutinating activity. Publication Abstract from PubMed Multivalent galactosides inhibiting Pseudomonas aeruginosa biofilms may help control this problematic pathogen. To understand the binding mode of tetravalent glycopeptide dendrimer GalAG2 [(Gal-beta-OC6H4CO-Lys-Pro-Leu)4(Lys-Phe-Lys-Ile)2Lys-His-Ile-NH2] to its target lectin LecA, crystal structures of LecA complexes with divalent analog GalAG1 [(Gal-beta-OC6H4CO-Lys-Pro-Leu)2Lys-Phe-Lys-Ile-NH2] and related glucose-triazole linked bis-galactosides 3u3 [Gal-beta-O(CH2)n-(C2HN3)-4-Glc-beta-(C2HN3)-[beta-Glc-4-(N3HC2)]2-(CH2)n-O-beta- Gal (n = 1)] and 5u3 (n = 3) were obtained, revealing a chelate bound 3u3, cross-linked 5u3, and monovalently bound GalAG1. Nevertheless, a chelate bound model better explaining their strong LecA binding and the absence of lectin aggregation was obtained by modeling for all three ligands. A model of the chelate bound GalAG2.LecA complex was also obtained rationalizing its unusually tight LecA binding (KD = 2.5 nM) and aggregation by lectin cross-linking. The very weak biofilm inhibition with divalent LecA inhibitors suggests that lectin aggregation is necessary for biofilm inhibition by GalAG2, pointing to multivalent glycoclusters as a unique opportunity to control P. aeruginosa biofilms. Structural Insight into Multivalent Galactoside Binding to Pseudomonas aeruginosa Lectin LecA.,Visini R, Jin X, Bergmann M, Michaud G, Pertici F, Fu O, Pukin A, Branson TR, Thies-Weesie DM, Kemmink J, Gillon E, Imberty A, Stocker A, Darbre T, Pieters RJ, Reymond JL ACS Chem Biol. 2015 Aug 28. PMID:26295304 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Galactose-binding lectin

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