1w3a

Three dimensional structure of a novel pore-forming lectin from the mushroom Laetiporus sulphureus

spinqualitylabelsall models 1w3a, resolution 2.65Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1w3a is a 1 chain structure with sequence from Laetiporus sulphureus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.65Å Ligands: GAL, GLC, GOL, PRD_900008 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q7Z8V1_9APHY Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed LSL is a lectin produced by the parasitic mushroom Laetiporus sulphureus, which exhibits hemolytic and hemagglutinating activities. Here, we report the crystal structure of LSL refined to 2.6-A resolution determined by the single isomorphous replacement method with the anomalous scatter (SIRAS) signal of a platinum derivative. The structure reveals that LSL is hexameric, which was also shown by analytical ultracentrifugation. The monomeric protein (35 kDa) consists of two distinct modules: an N-terminal lectin module and a pore-forming module. The lectin module has a beta-trefoil scaffold that bears structural similarities to those present in toxins known to interact with galactose-related carbohydrates such as the hemagglutinin component (HA1) of the progenitor toxin from Clostridium botulinum, abrin, and ricin. On the other hand, the C-terminal pore-forming module (composed of domains 2 and 3) exhibits three-dimensional structural resemblances with domains 3 and 4 of the beta-pore-forming toxin aerolysin from the Gram-negative bacterium Aeromonas hydrophila, and domains 2 and 3 from the epsilon-toxin from Clostridium perfringens. This finding reveals the existence of common structural elements within the aerolysin-like family of toxins that could be directly involved in membrane-pore formation. The crystal structures of the complexes of LSL with lactose and N-acetyllactosamine reveal two dissacharide-binding sites per subunit and permits the identification of critical residues involved in sugar binding. Structural analysis of the Laetiporus sulphureus hemolytic pore-forming lectin in complex with sugars.,Mancheno JM, Tateno H, Goldstein IJ, Martinez-Ripoll M, Hermoso JA J Biol Chem. 2005 Apr 29;280(17):17251-9. Epub 2005 Feb 1. PMID:15687495 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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