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| {{STRUCTURE_1w3f| PDB=1w3f | SCENE= }} | | {{STRUCTURE_1w3f| PDB=1w3f | SCENE= }} |
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| '''CRYSTAL STRUCTURE OF THE HEMOLYTIC LECTIN FROM THE MUSHROOM LAETIPORUS SULPHUREUS COMPLEXED WITH N-ACETYLLACTOSAMINE IN THE GAMMA MOTIF'''
| | ===CRYSTAL STRUCTURE OF THE HEMOLYTIC LECTIN FROM THE MUSHROOM LAETIPORUS SULPHUREUS COMPLEXED WITH N-ACETYLLACTOSAMINE IN THE GAMMA MOTIF=== |
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| ==Overview==
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| 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.
| | The line below this paragraph, {{ABSTRACT_PUBMED_15687495}}, adds the Publication Abstract to the page |
| | (as it appears on PubMed at http://www.pubmed.gov), where 15687495 is the PubMed ID number. |
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| | {{ABSTRACT_PUBMED_15687495}} |
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| ==About this Structure== | | ==About this Structure== |
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| [[Category: Oligomer]] | | [[Category: Oligomer]] |
| [[Category: Pore-forming toxin]] | | [[Category: Pore-forming toxin]] |
| ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 13:06:16 2008'' | | |
| | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 02:49:46 2008'' |
