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1oce

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[[Image:1oce.gif|left|200px]]
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{{STRUCTURE_1oce| PDB=1oce | SCENE= }}
{{STRUCTURE_1oce| PDB=1oce | SCENE= }}
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'''ACETYLCHOLINESTERASE (E.C. 3.1.1.7) COMPLEXED WITH MF268'''
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===ACETYLCHOLINESTERASE (E.C. 3.1.1.7) COMPLEXED WITH MF268===
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==Overview==
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The crystal structure of Torpedo californica (Tc) acetylcholinesterase (AChE) carbamoylated by the physostigmine analogue 8-(cis-2,6-dimethylmorpholino)octylcarbamoyleseroline (MF268) is reported at 2.7 A resolution. In the X-ray structure, the dimethylmorpholinooctylcarbamic moiety of MF268 is covalently bound to the catalytic serine, which is located at the bottom of a long and narrow gorge. The alkyl chain of the inhibitor fills the upper part of the gorge, blocking the entrance of the active site. This prevents eseroline, the leaving group of the carbamoylation process, from exiting through this path. Surprisingly, the relatively bulky eseroline is not found in the crystal structure, thus implying the existence of an alternative route for its clearance. This represents indirect evidence that a "back door" opening may occur and shows that the release of products via a "back door" is a likely alternative for this enzyme. However, its relevance as far as the mechanism of substrate hydrolysis is concerned needs to be established. This study suggests that the use of properly designed acylating inhibitors, which can block the entrance of catalytic sites, may be exploited as a general approach for investigating the existence of "back doors" for the clearance of products.
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(as it appears on PubMed at http://www.pubmed.gov), where 10231521 is the PubMed ID number.
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{{ABSTRACT_PUBMED_10231521}}
==About this Structure==
==About this Structure==
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[[Category: Neurotransmitter cleavage]]
[[Category: Neurotransmitter cleavage]]
[[Category: Serine esterase]]
[[Category: Serine esterase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 03:39:48 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 19:18:08 2008''

Revision as of 16:18, 27 July 2008

Image:1oce.png

Template:STRUCTURE 1oce

ACETYLCHOLINESTERASE (E.C. 3.1.1.7) COMPLEXED WITH MF268

Template:ABSTRACT PUBMED 10231521

About this Structure

1OCE is a Single protein structure of sequence from Torpedo californica. Full crystallographic information is available from OCA.

Reference

"Back door" opening implied by the crystal structure of a carbamoylated acetylcholinesterase., Bartolucci C, Perola E, Cellai L, Brufani M, Lamba D, Biochemistry. 1999 May 4;38(18):5714-9. PMID:10231521

Page seeded by OCA on Sun Jul 27 19:18:08 2008

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