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1xtg

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{{STRUCTURE_1xtg| PDB=1xtg | SCENE= }}
{{STRUCTURE_1xtg| PDB=1xtg | SCENE= }}
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'''Crystal structure of NEUROTOXIN BONT/A complexed with Synaptosomal-associated protein 25'''
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===Crystal structure of NEUROTOXIN BONT/A complexed with Synaptosomal-associated protein 25===
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==Overview==
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Clostridal neurotoxins (CNTs) are the causative agents of the neuroparalytic diseases botulism and tetanus. CNTs impair neuronal exocytosis through specific proteolysis of essential proteins called SNAREs. SNARE assembly into a low-energy ternary complex is believed to catalyse membrane fusion, precipitating neurotransmitter release; this process is attenuated in response to SNARE proteolysis. Site-specific SNARE hydrolysis is catalysed by the CNT light chains, a unique group of zinc-dependent endopeptidases. The means by which a CNT properly identifies and cleaves its target SNARE has been a subject of much speculation; it is thought to use one or more regions of enzyme-substrate interaction remote from the active site (exosites). Here we report the first structure of a CNT endopeptidase in complex with its target SNARE at a resolution of 2.1 A: botulinum neurotoxin serotype A (BoNT/A) protease bound to human SNAP-25. The structure, together with enzyme kinetic data, reveals an array of exosites that determine substrate specificity. Substrate orientation is similar to that of the general zinc-dependent metalloprotease thermolysin. We observe significant structural changes near the toxin's catalytic pocket upon substrate binding, probably serving to render the protease competent for catalysis. The novel structures of the substrate-recognition exosites could be used for designing inhibitors specific to BoNT/A.
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(as it appears on PubMed at http://www.pubmed.gov), where 15592454 is the PubMed ID number.
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{{ABSTRACT_PUBMED_15592454}}
==About this Structure==
==About this Structure==
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[[Category: Botulism]]
[[Category: Botulism]]
[[Category: Exosite]]
[[Category: Exosite]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 15:29:29 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 13:06:39 2008''

Revision as of 10:06, 29 July 2008

Image:1xtg.png

Template:STRUCTURE 1xtg

Crystal structure of NEUROTOXIN BONT/A complexed with Synaptosomal-associated protein 25

Template:ABSTRACT PUBMED 15592454

About this Structure

1XTG is a Protein complex structure of sequences from Clostridium botulinum and Homo sapiens. Full crystallographic information is available from OCA.

Reference

Substrate recognition strategy for botulinum neurotoxin serotype A., Breidenbach MA, Brunger AT, Nature. 2004 Dec 16;432(7019):925-9. Epub 2004 Dec 12. PMID:15592454

Page seeded by OCA on Tue Jul 29 13:06:39 2008

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