Crystal Structure of Human Butyrylcholinesterase and of Its Complexes with Substrate and Products

Yvain Nicolet, Oksana Lockridge, Patrick Masson, Juan C. Fontecilla-Camps, Florian Nachon

Research output: Contribution to journalArticlepeer-review

541 Scopus citations

Abstract

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 Ser198 has been modeled as bound butyrate.

Original languageEnglish (US)
Pages (from-to)41141-41147
Number of pages7
JournalJournal of Biological Chemistry
Volume278
Issue number42
DOIs
StatePublished - Oct 17 2003

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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