6TR6

N-acetylserotonin-Notum complex

  • Classification: ONCOPROTEIN
  • Organism(s): Homo sapiens
  • Expression System: Homo sapiens
  • Mutation(s): Yes 

  • Deposited: 2019-12-17 Released: 2020-01-08 
  • Deposition Author(s): Zhao, Y., Jones, E.Y.
  • Funding Organization(s): Medical Research Council (MRC, United Kingdom), Cancer Research UK

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.35 Å
  • R-Value Free: 0.193 
  • R-Value Work: 0.181 
  • R-Value Observed: 0.181 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structural characterization of melatonin as an inhibitor of the Wnt deacylase Notum.

Zhao, Y.Ren, J.Hillier, J.Jones, M.Lu, W.Jones, E.Y.

(2020) J Pineal Res 68: e12630-e12630

  • DOI: 10.1111/jpi.12630
  • Primary Citation of Related Structures:  
    6TR5, 6TR7, 6TR6

  • PubMed Abstract: 
  • The hormone melatonin, secreted from the pineal gland, mediates multiple physiological effects including modulation of Wnt/β-catenin signalling. The Wnt palmitoleate lipid modification is essential for its signalling activity, while the carboxylesterase ...

    The hormone melatonin, secreted from the pineal gland, mediates multiple physiological effects including modulation of Wnt/β-catenin signalling. The Wnt palmitoleate lipid modification is essential for its signalling activity, while the carboxylesterase Notum can remove the lipid from Wnt and inactivate it. Notum enzyme inhibition can therefore upregulate Wnt signalling. While searching for Notum inhibitors by crystallographic fragment screening, a hit compound N-[2-(5-fluoro-1H-indol-3-yl)ethyl]acetamide that is structurally similar to melatonin came to our attention. We then soaked melatonin and its precursor N-acetylserotonin into Notum crystals and obtained high-resolution structures (≤1.5 Å) of their complexes. In each of the structures, two compound molecules bind with Notum: one at the enzyme's catalytic pocket, overlapping the space occupied by the acyl tail of the Wnt palmitoleate lipid, and the other at the edge of the pocket opposite the substrate entrance. Although the inhibitory activity of melatonin shown by in vitro enzyme assays is low (IC 50 75 µmol/L), the structural information reported here provides a basis for the design of potent and brain accessible drugs for neurodegenerative diseases such as Alzheimer's disease, in which upregulation of Wnt signalling may be beneficial.


    Organizational Affiliation

    Division of Structural Biology, Wellcome Centre for Human Genetics, University of Oxford, Oxford, UK.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Palmitoleoyl-protein carboxylesterase NOTUM A383Homo sapiensMutation(s): 1 
Gene Names: NOTUMOK/SW-CL.30
EC: 3.1.1.98
Find proteins for Q6P988 (Homo sapiens)
Explore Q6P988 
Go to UniProtKB:  Q6P988
NIH Common Fund Data Resources
PHAROS:  Q6P988
Protein Feature View
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.35 Å
  • R-Value Free: 0.193 
  • R-Value Work: 0.181 
  • R-Value Observed: 0.181 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 59.51α = 90
b = 72.73β = 90
c = 77.85γ = 90
Software Package:
Software NamePurpose
xia2data scaling
PHENIXrefinement
PDB_EXTRACTdata extraction
xia2data reduction
xia2phasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data

  • Deposited Date: 2019-12-17 
  • Released Date: 2020-01-08 
  • Deposition Author(s): Zhao, Y., Jones, E.Y.

Funding OrganizationLocationGrant Number
Medical Research Council (MRC, United Kingdom)United KingdomMR/M000141/1
Cancer Research UKUnited KingdomC375/A17721

Revision History 

  • Version 1.0: 2020-01-08
    Type: Initial release
  • Version 1.1: 2020-02-19
    Changes: Data collection, Database references
  • Version 1.2: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Derived calculations, Structure summary