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2ha5

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{{STRUCTURE_2ha5| PDB=2ha5 | SCENE= }}
{{STRUCTURE_2ha5| PDB=2ha5 | SCENE= }}
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'''Crystal structure of mutant S203A of acetylcholinesterase complexed with acetylthiocholine'''
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===Crystal structure of mutant S203A of acetylcholinesterase complexed with acetylthiocholine===
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==Overview==
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Hydrolysis of acetylcholine catalyzed by acetylcholinesterase (AChE), one of the most efficient enzymes in nature, occurs at the base of a deep and narrow active center gorge. At the entrance of the gorge, the peripheral anionic site provides a binding locus for allosteric ligands, including substrates. To date, no structural information on substrate entry to the active center from the peripheral site of AChE or its subsequent egress has been reported. Complementary crystal structures of mouse AChE and an inactive mouse AChE mutant with a substituted catalytic serine (S203A), in various complexes with four substrates (acetylcholine, acetylthiocholine, succinyldicholine, and butyrylthiocholine), two non-hydrolyzable substrate analogues (m-(N,N,N-trimethylammonio)-trifluoroacetophenone and 4-ketoamyltrimethylammonium), and one reaction product (choline) were solved in the 2.05-2.65-A resolution range. These structures, supported by binding and inhibition data obtained on the same complexes, reveal the successive positions and orientations of the substrates bound to the peripheral site and proceeding within the gorge toward the active site, the conformations of the presumed transition state for acylation and the acyl-enzyme intermediate, and the positions and orientations of the dissociating and egressing products. Moreover, the structures of the AChE mutant in complexes with acetylthiocholine and succinyldicholine reveal additional substrate binding sites on the enzyme surface, distal to the gorge entry. Hence, we provide a comprehensive set of structural snapshots of the steps leading to the intermediates of catalysis and the potential regulation by substrate binding to various allosteric sites at the enzyme surface.
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(as it appears on PubMed at http://www.pubmed.gov), where 16837465 is the PubMed ID number.
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{{ABSTRACT_PUBMED_16837465}}
==About this Structure==
==About this Structure==
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[[Category: Mutant]]
[[Category: Mutant]]
[[Category: Serine esterase]]
[[Category: Serine esterase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 06:02:45 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 03:23:56 2008''

Revision as of 00:24, 29 July 2008

Image:2ha5.png

Template:STRUCTURE 2ha5

Crystal structure of mutant S203A of acetylcholinesterase complexed with acetylthiocholine

Template:ABSTRACT PUBMED 16837465

About this Structure

2HA5 is a Single protein structure of sequence from Mus musculus. Full crystallographic information is available from OCA.

Reference

Substrate and product trafficking through the active center gorge of acetylcholinesterase analyzed by crystallography and equilibrium binding., Bourne Y, Radic Z, Sulzenbacher G, Kim E, Taylor P, Marchot P, J Biol Chem. 2006 Sep 29;281(39):29256-67. Epub 2006 Jul 12. PMID:16837465

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