2c5g: Difference between revisions

Revision as of 15:03, 6 July 2008

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File:2c5g.png

Template:STRUCTURE 2c5g

TORPEDO CALIFORNICA ACETYLCHOLINESTERASE IN COMPLEX WITH 20MM THIOCHOLINETORPEDO CALIFORNICA ACETYLCHOLINESTERASE IN COMPLEX WITH 20MM THIOCHOLINE

Template:ABSTRACT PUBMED 16763558

About this StructureAbout this Structure

2C5G is a Single protein structure of sequence from Torpedo californica. Full crystallographic information is available from OCA.

ReferenceReference

Structural insights into substrate traffic and inhibition in acetylcholinesterase., Colletier JP, Fournier D, Greenblatt HM, Stojan J, Sussman JL, Zaccai G, Silman I, Weik M, EMBO J. 2006 Jun 21;25(12):2746-56. Epub 2006 Jun 8. PMID:16763558

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OCA

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-'''TORPEDO CALIFORNICA ACETYLCHOLINESTERASE IN COMPLEX WITH 20MM THIOCHOLINE'''
+===TORPEDO CALIFORNICA ACETYLCHOLINESTERASE IN COMPLEX WITH 20MM THIOCHOLINE===
-==Overview==
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-Acetylcholinesterase (AChE) terminates nerve-impulse transmission at cholinergic synapses by rapid hydrolysis of the neurotransmitter, acetylcholine. Substrate traffic in AChE involves at least two binding sites, the catalytic and peripheral anionic sites, which have been suggested to be allosterically related and involved in substrate inhibition. Here, we present the crystal structures of Torpedo californica AChE complexed with the substrate acetylthiocholine, the product thiocholine and a nonhydrolysable substrate analogue. These structures provide a series of static snapshots of the substrate en route to the active site and identify, for the first time, binding of substrate and product at both the peripheral and active sites. Furthermore, they provide structural insight into substrate inhibition in AChE at two different substrate concentrations. Our structural data indicate that substrate inhibition at moderate substrate concentration is due to choline exit being hindered by a substrate molecule bound at the peripheral site. At the higher concentration, substrate inhibition arises from prevention of exit of acetate due to binding of two substrate molecules within the active-site gorge.
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 [[Category: Substrate inhibition]]
 [[Category: Synapse]]
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