7AMD

In situ assembly of choline acetyltransferase ligands by a hydrothiolation reaction reveals key determinants for inhibitor design


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.210 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.179 

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Literature

In Situ Assembly of Choline Acetyltransferase Ligands by a Hydrothiolation Reaction Reveals Key Determinants for Inhibitor Design.

Wiktelius, D.Allgardsson, A.Bergstrom, T.Hoster, N.Akfur, C.Forsgren, N.Lejon, C.Hedenstrom, M.Linusson, A.Ekstrom, F.

(2021) Angew Chem Int Ed Engl 60: 813-819

  • DOI: 10.1002/anie.202011989
  • Primary Citation of Related Structures:  
    7AMD

  • PubMed Abstract: 
  • The potential drug target choline acetyltransferase (ChAT) catalyses the production of the neurotransmitter acetylcholine in cholinergic neurons, T-cells, and B-cells. Herein, we show that arylvinylpyridiniums (AVPs), the most widely studied class of ChAT inhibitors, act as substrate in an unusual coenzyme A-dependent hydrothiolation reaction ...

    The potential drug target choline acetyltransferase (ChAT) catalyses the production of the neurotransmitter acetylcholine in cholinergic neurons, T-cells, and B-cells. Herein, we show that arylvinylpyridiniums (AVPs), the most widely studied class of ChAT inhibitors, act as substrate in an unusual coenzyme A-dependent hydrothiolation reaction. This in situ synthesis yields an adduct that is the actual enzyme inhibitor. The adduct is deeply buried in the active site tunnel of ChAT and interactions with a hydrophobic pocket near the choline binding site have major implications for the molecular recognition of inhibitors. Our findings clarify the inhibition mechanism of AVPs, establish a drug modality that exploits a target-catalysed reaction between exogenous and endogenous precursors, and provide new directions for the development of ChAT inhibitors with improved potency and bioactivity.


    Organizational Affiliation

    Swedish Defence Research Agency, CBRN Defence and Security, 90187, Umeå, Sweden.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Choline O-acetyltransferaseA612Homo sapiensMutation(s): 7 
Gene Names: CHAT
EC: 2.3.1.6
UniProt & NIH Common Fund Data Resources
Find proteins for P28329 (Homo sapiens)
Explore P28329 
Go to UniProtKB:  P28329
PHAROS:  P28329
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
RMW (Subject of Investigation/LOI)
Query on RMW

Download Ideal Coordinates CCD File 
B [auth A][[(2~{R},3~{S},4~{R},5~{R})-5-(6-aminopurin-9-yl)-4-oxidanyl-3-phosphonooxy-oxolan-2-yl]methoxy-oxidanyl-phosphoryl] [(3~{R})-2,2-dimethyl-4-[[3-[2-[(1~{R})-2-(1-methylpyridin-4-yl)-1-naphthalen-1-yl-ethyl]sulfanylethylamino]-3-oxidanylidene-propyl]amino]-3-oxidanyl-4-oxidanylidene-butyl] hydrogen phosphate
C39 H52 N8 O16 P3 S
OYNQMIGIWWZLSR-UAMJECFJSA-O
 Ligand Interaction
NA
Query on NA

Download Ideal Coordinates CCD File 
C [auth A], D [auth A]SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.210 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.179 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 54.614α = 90
b = 71.836β = 90
c = 169.597γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
PHENIXrefinement
XDSdata reduction
Aimlessdata scaling
PDB_EXTRACTdata extraction
PHENIXphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Other governmentSweden--

Revision History  (Full details and data files)

  • Version 1.0: 2020-10-28
    Type: Initial release
  • Version 1.1: 2021-03-03
    Changes: Database references