1P0M image
Entry Detail
PDB ID:
1P0M
Keywords:
Title:
Crystal structure of human butyryl cholinesterase in complex with a choline molecule
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2003-04-10
Release Date:
2003-08-05
Method Details:
Experimental Method:
Resolution:
2.38 Å
R-Value Free:
0.24
R-Value Work:
0.21
R-Value Observed:
0.21
Space Group:
I 4 2 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Cholinesterase
Mutations:N17Q, N455Q, N481Q, N486Q
Chain IDs:A
Chain Length:529
Number of Molecules:1
Biological Source:Homo sapiens
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
ASN A ASN GLYCOSYLATION SITE
Primary Citation
Crystal structure of human butyrylcholinesterase and of its complexes with substrate and products.
J.Biol.Chem. 278 41141 41147 (2003)
PMID: 12869558 DOI: 10.1074/jbc.M210241200

Abstact

Cholinesterases are among the most efficient enzymes known. They are divided into two groups: acetylcholinesterase, involved in the hydrolysis of the neurotransmitter acetylcholine, and butyrylcholinesterase of unknown function. Several crystal structures of the former have shown that the active site is located at the bottom of a deep and narrow gorge, raising the question of how substrate and products enter and leave. Human butyrylcholinesterase (BChE) has attracted attention because it can hydrolyze toxic esters such as cocaine or scavenge organophosphorus pesticides and nerve agents. Here we report the crystal structures of several recombinant truncated human BChE complexes and conjugates and provide a description for mechanistically relevant non-productive substrate and product binding. As expected, the structure of BChE is similar to a previously published theoretical model of this enzyme and to the structure of Torpedo acetylcholinesterase. The main difference between the experimentally determined BChE structure and its model is found at the acyl binding pocket that is significantly bigger than expected. An electron density peak close to the catalytic Ser(198) has been modeled as bound butyrate.

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