4a3x

Structure of the N-terminal domain of the Epa1 adhesin (Epa1-Np) from the pathogenic yeast Candida glabrata, in complex with calcium and lactose

spinqualitylabelsall models 4a3x, resolution 1.65Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4a3x is a 1 chain structure with sequence from Atcc 2001. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CA, LAT Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed The yeast Candida glabrata represents the second major cause of clinical candidiasis cases in the world. The ability of this opportunistic pathogen to adhere to human epithelial and endothelial cells relies on the Epa adhesins, a large set of cell-wall proteins whose N-terminal domains are endowed with a calcium-dependent lectin activity. This feature allows the yeast cells to adhere to host cells by establishing multiple interactions with the glycans expressed on their cell membrane. The ligand-binding domain of the Epa1p adhesin, which is one of the best characterized in the Epa family, was expressed in Escherichia coli, purified and crystallized in complex with lactose. Sequence identity with the domain of another yeast adhesin, the Flo5p flocculin from Saccharomyces cerevisiae, was exploited for molecular replacement and the structure of the domain was solved at a resolution of 1.65 A. The protein is a member of the PA14 superfamily. It has a beta-sandwich core and a DcisD calcium-binding motif, which is also present in the binding site of Flo5p. However, Epa1p differs from this homologue by the lack of a Flo5-like subdomain and by a significantly decreased accessibility of the solvent to the binding site, in which a calcium ion still plays an active role in the interactions with carbohydrates. This structural insight, together with fluorescence-assay data, confirms and explains the higher specificity of Epa1p adhesin for glycan molecules compared with the S. cerevisiae flocculins. The epithelial adhesin 1 (Epa1p) from the human-pathogenic yeast Candida glabrata: structural and functional study of the carbohydrate-binding domain.,Ielasi FS, Decanniere K, Willaert RG Acta Crystallogr D Biol Crystallogr. 2012 Mar;68(Pt 3):210-7. Epub 2012 Feb 7. PMID:22349222 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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