2FY3

Structures of ligand bound human choline acetyltransferase provides insight into regulation of acetylcholine synthesis


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.27 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.196 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Substrate binding and catalytic mechanism of human choline acetyltransferase.

Kim, A.R.Rylett, R.J.Shilton, B.H.

(2006) Biochemistry 45: 14621-14631

  • DOI: 10.1021/bi061536l
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Choline acetyltransferase (ChAT) catalyzes the synthesis of the neurotransmitter acetylcholine from choline and acetyl-CoA, and its presence is a defining feature of cholinergic neurons. We report the structure of human ChAT to a resolution of 2.2 A ...

    Choline acetyltransferase (ChAT) catalyzes the synthesis of the neurotransmitter acetylcholine from choline and acetyl-CoA, and its presence is a defining feature of cholinergic neurons. We report the structure of human ChAT to a resolution of 2.2 A along with structures for binary complexes of ChAT with choline, CoA, and a nonhydrolyzable acetyl-CoA analogue, S-(2-oxopropyl)-CoA. The ChAT-choline complex shows which features of choline are important for binding and explains how modifications of the choline trimethylammonium group can be tolerated by the enzyme. A detailed model of the ternary Michaelis complex fully supports the direct transfer of the acetyl group from acetyl-CoA to choline through a mechanism similar to that seen in the serine hydrolases for the formation of an acyl-enzyme intermediate. Domain movements accompany CoA binding, and a surface loop, which is disordered in the unliganded enzyme, becomes localized and binds directly to the phosphates of CoA, stabilizing the complex. Interactions between this surface loop and CoA may function to lower the KM for CoA and could be important for phosphorylation-dependent regulation of ChAT activity.


    Organizational Affiliation

    Department of Biochemistry, and Physiology and Pharmacology, Schulich School of Medicine and Dentistry, University of Western Ontario, Ontario, Canada.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Choline O-acetyltransferase
A
612Homo sapiensMutation(s): 7 
Gene Names: CHAT
EC: 2.3.1.6
Find proteins for P28329 (Homo sapiens)
Go to Gene View: CHAT
Go to UniProtKB:  P28329
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GOL
Query on GOL

Download SDF File 
Download CCD File 
A
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
CHT
Query on CHT

Download SDF File 
Download CCD File 
A
CHOLINE ION
C5 H14 N O
OEYIOHPDSNJKLS-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
CHTKi: 400000 - 7600000 nM (86) BINDINGDB
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.27 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.196 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 54.780α = 90.00
b = 76.260β = 90.00
c = 164.290γ = 90.00
Software Package:
Software NamePurpose
MAR345data collection
CNSrefinement
PDB_EXTRACTdata extraction
SCALEPACKdata scaling
DENZOdata reduction
AMoREphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-12-12
    Type: Initial release
  • Version 1.1: 2008-05-01
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Non-polymer description, Version format compliance
  • Version 1.3: 2017-10-18
    Type: Refinement description