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1qnu

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[[Image:1qnu.gif|left|200px]]
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{{STRUCTURE_1qnu| PDB=1qnu | SCENE= }}
{{STRUCTURE_1qnu| PDB=1qnu | SCENE= }}
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'''SHIGA-LIKE TOXIN I B SUBUNIT COMPLEXED WITH THE BRIDGED-STARFISH INHIBITOR'''
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===SHIGA-LIKE TOXIN I B SUBUNIT COMPLEXED WITH THE BRIDGED-STARFISH INHIBITOR===
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==Overview==
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The diseases caused by Shiga and cholera toxins account for the loss of millions of lives each year. Both belong to the clinically significant subset of bacterial AB5 toxins consisting of an enzymatically active A subunit that gains entry to susceptible mammalian cells after oligosaccharide recognition by the B5 homopentamer. Therapies might target the obligatory oligosaccharide-toxin recognition event, but the low intrinsic affinity of carbohydrate-protein interactions hampers the development of low-molecular-weight inhibitors. The toxins circumvent low affinity by binding simultaneously to five or more cell-surface carbohydrates. Here we demonstrate the use of the crystal structure of the B5 subunit of Escherichia coli O157:H7 Shiga-like toxin I (SLT-I) in complex with an analogue of its carbohydrate receptor to design an oligovalent, water-soluble carbohydrate ligand (named STARFISH), with subnanomolar inhibitory activity. The in vitro inhibitory activity is 1-10-million-fold higher than that of univalent ligands and is by far the highest molar activity of any inhibitor yet reported for Shiga-like toxins I and II. Crystallography of the STARFISH/Shiga-like toxin I complex explains this activity. Two trisaccharide receptors at the tips of each of five spacer arms simultaneously engage all five B subunits of two toxin molecules.
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(as it appears on PubMed at http://www.pubmed.gov), where 10688205 is the PubMed ID number.
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{{ABSTRACT_PUBMED_10688205}}
==About this Structure==
==About this Structure==
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[[Category: Subnanomolar inhibitor]]
[[Category: Subnanomolar inhibitor]]
[[Category: Toxin]]
[[Category: Toxin]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 06:29:51 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 21:16:33 2008''

Revision as of 18:16, 27 July 2008

Image:1qnu.png

Template:STRUCTURE 1qnu

SHIGA-LIKE TOXIN I B SUBUNIT COMPLEXED WITH THE BRIDGED-STARFISH INHIBITOR

Template:ABSTRACT PUBMED 10688205

About this Structure

1QNU is a Single protein structure of sequence from Bacteriophage h30, bacteriophaurce 3. Full crystallographic information is available from OCA.

Reference

Shiga-like toxins are neutralized by tailored multivalent carbohydrate ligands., Kitov PI, Sadowska JM, Mulvey G, Armstrong GD, Ling H, Pannu NS, Read RJ, Bundle DR, Nature. 2000 Feb 10;403(6770):669-72. PMID:10688205

Page seeded by OCA on Sun Jul 27 21:16:33 2008

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