Long route or shortcut? A molecular dynamics study of traffic of thiocholine within the active-site gorge of acetylcholinesterase.
Biophys J
; 99(12): 4003-11, 2010 Dec 15.
Article
em En
| MEDLINE
| ID: mdl-21156143
ABSTRACT
The principal role of acetylcholinesterase is termination of nerve impulse transmission at cholinergic synapses, by rapid hydrolysis of the neurotransmitter acetylcholine to acetate and choline. Its active site is buried at the bottom of a deep and narrow gorge, at the rim of which is found a second anionic site, the peripheral anionic site. The fact that the active site is so deeply buried has raised cogent questions as to how rapid traffic of substrate and products occurs in such a confined environment. Various theoretical and experimental approaches have been used to solve this problem. Here, multiple conventional molecular dynamics simulations have been performed to investigate the clearance of the product, thiocholine, from the active-site gorge of acetylcholinesterase. Our results indicate that thiocholine is released from the peripheral anionic site via random pathways, while three exit routes appear to be favored for its release from the active site, namely, along the axis of the active-site gorge, and through putative back- and side-doors. The back-door pathway is that via which thiocholine exits most frequently. Our results are in good agreement with kinetic and kinetic-crystallography studies. We propose the use of multiple molecular dynamics simulations as a fast yet accurate complementary tool in structural studies of enzymatic trafficking.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Acetilcolinesterase
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Tiocolina
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Torpedo
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Domínio Catalítico
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Simulação de Dinâmica Molecular
Limite:
Animals
Idioma:
En
Ano de publicação:
2010
Tipo de documento:
Article