Crystal structure of BRD4 bromodomain 1 with N-methylpyrrolidin-2-one (NMP) derivative 10 (methyl [(3R)-1-methyl-5-oxopyrrolidin-3-yl]acetate)

Experimental Data Snapshot

  • Resolution: 1.30 Å
  • R-Value Free: 0.166 
  • R-Value Work: 0.137 
  • R-Value Observed: 0.139 

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Synthesis and elaboration of N-methylpyrrolidone as an acetamide fragment substitute in bromodomain inhibition.

Hilton-Proctor, J.P.Ilyichova, O.Zheng, Z.Jennings, I.G.Johnstone, R.W.Shortt, J.Mountford, S.J.Scanlon, M.J.Thompson, P.E.

(2019) Bioorg Med Chem 27: 115157-115157

  • DOI: https://doi.org/10.1016/j.bmc.2019.115157
  • Primary Citation of Related Structures:  
    6PRT, 6PS9, 6PSB

  • PubMed Abstract: 

    N-Methylpyrrolidone is a solvent molecule which has been shown to compete with acetyl-lysine-containing peptides for binding to bromodomains. From crystallographic studies, it has also been shown to closely mimic the acetamide binding motif in several bromodomains, but has not yet been directly pursued as a fragment in bromodomain inhibition. In this paper, we report the elaboration of N-methylpyrrolidone as a potential lead in fragment-based drug design. Firstly, N-methylpyrrolidone was functionalised to provide points for chemical elaboration. Then, the moiety was incorporated into analogues of the reported bromodomain inhibitor, Olinone. X-ray crystallography revealed that the modified analogues showed comparable binding affinity and structural mimicry to Olinone in the bromodomain binding site.

  • Organizational Affiliation

    Medicinal Chemistry, Monash Institute of Pharmaceutical Science, Monash University, 381 Royal Parade, Parkville, Victoria, Australia. Electronic address: philip.thompson@monash.edu.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Bromodomain-containing protein 4126Homo sapiensMutation(s): 0 
Gene Names: BRD4HUNK1
UniProt & NIH Common Fund Data Resources
Find proteins for O60885 (Homo sapiens)
Explore O60885 
Go to UniProtKB:  O60885
PHAROS:  O60885
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO60885
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
OWA (Subject of Investigation/LOI)
Query on OWA

Download Ideal Coordinates CCD File 
B [auth A]methyl [(3R)-1-methyl-5-oxopyrrolidin-3-yl]acetate
C8 H13 N O3
Binding Affinity Annotations 
IDSourceBinding Affinity
OWA Binding MOAD:  6PRT IC50: 2.12e+6 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 1.30 Å
  • R-Value Free: 0.166 
  • R-Value Work: 0.137 
  • R-Value Observed: 0.139 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 37.7α = 90
b = 44.13β = 90
c = 78.39γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
Aimlessdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2019-11-27
    Type: Initial release
  • Version 1.1: 2019-12-04
    Changes: Database references
  • Version 1.2: 2023-10-11
    Changes: Data collection, Database references, Refinement description