4iis

Crystal structure of a glycosylated beta-1,3-glucanase (HEV B 2), An allergen from Hevea Brasiliensis (Space group P41)

spinqualitylabelsall models 4iis, resolution 2.67Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4iis is a 4 chain structure with sequence from Hevea brasiliensis. This structure supersedes the now removed PDB entry 3f55. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CAC, FLC, NA, NAG NonStd Res: PCA Related: 4hpg Activity: Glucan endo-1,3-beta-D-glucosidase, with EC number 3.2.1.39 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Endogenous glycosylated Hev b 2 (endo-beta-1,3-glucanase) from Hevea brasiliensis is an important latex allergen that is recognized by IgE antibodies from patients who suffer from latex allergy. The carbohydrate moieties of Hev b 2 constitute a potentially important IgE-binding epitope that could be responsible for its cross-reactivity. Here, the structure of the endogenous isoform II of Hev b 2 that exhibits three post-translational modifications, including an N-terminal pyroglutamate and two glycosylation sites at Asn27 and at Asn314, is reported from two crystal polymorphs. These modifications form a patch on the surface of the molecule that is proposed to be one of the binding sites for IgE. A structure is also proposed for the most important N-glycan present in this protein as determined by digestion with specific enzymes. To analyze the role of the carbohydrate moieties in IgE antibody binding and in human basophil activation, the glycoallergen was enzymatically deglycosylated and evaluated. Time-lapse automated video microscopy of basophils stimulated with glycosylated Hev b 2 revealed basophil activation and degranulation. Immunological studies suggested that carbohydrates on Hev b 2 represent an allergenic IgE epitope. In addition, a dimer was found in each asymmetric unit that may reflect a regulatory mechanism of this plant defence protein. Structural analysis of the endogenous glycoallergen Hev b 2 (endo-beta-1,3-glucanase) from Hevea brasiliensis and its recognition by human basophils.,Rodriguez-Romero A, Hernandez-Santoyo A, Fuentes-Silva D, Palomares LA, Munoz-Cruz S, Yepez-Mulia L, Orozco-Martinez S Acta Crystallogr D Biol Crystallogr. 2014 Feb;70(Pt 2):329-41. doi:, 10.1107/S1399004713027673. Epub 2014 Jan 29. PMID:24531467 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Glucanase 3D structures

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