Crystal structure of the tandem bromodomain (BD1, BD2) of human TAF1 bound to mTORC1/2 inhibitor AZD3147

Experimental Data Snapshot

  • Resolution: 2.20 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.230 
  • R-Value Observed: 0.231 

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This is version 1.3 of the entry. See complete history


Discovery of Dual TAF1-ATR Inhibitors and Ligand-Induced Structural Changes of the TAF1 Tandem Bromodomain.

Karim, R.M.Yang, L.Chen, L.Bikowitz, M.J.Lu, J.Grassie, D.Shultz, Z.P.Lopchuk, J.M.Chen, J.Schonbrunn, E.

(2022) J Med Chem 65: 4182-4200

  • DOI: https://doi.org/10.1021/acs.jmedchem.1c01999
  • Primary Citation of Related Structures:  
    7JJG, 7JJH, 7JSP, 7K03, 7K0D, 7K0U, 7K1P, 7K27, 7K3O, 7K42, 7K6F, 7L6X

  • PubMed Abstract: 

    Bromodomains regulate chromatin remodeling and gene transcription through recognition of acetylated lysines on histones and other proteins. Bromodomain-containing protein TAF1, a subunit of general transcription factor TFIID, initiates preinitiation complex formation and cellular transcription. TAF1 serves as a cofactor for certain oncogenic transcription factors and is implicated in regulating the p53 tumor suppressor. Therefore, TAF1 is a potential target to develop small molecule therapeutics for diseases arising from dysregulated transcription, such as cancer. Here, we report the ATR kinase inhibitor AZD6738 (Ceralasertib) and analogues thereof as bona fide inhibitors of TAF1. Crystallographic and small-angle X-ray scattering studies established that newly identified and previously reported inhibitors stabilize distinct structural states of the TAF1 tandem bromodomain through "open-closed" transitions and dimerization. Combined with functional studies on p53 signaling in cancer cell lines, the data provide new insights into the feasibility and challenges of TAF1 inhibitors as chemical probes and therapeutics.

  • Organizational Affiliation

    Drug Discovery Department, Moffitt Cancer Center, Tampa, Florida 33612, United States.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Transcription initiation factor TFIID subunit 1265Homo sapiensMutation(s): 0 
EC: (PDB Primary Data), (PDB Primary Data)
UniProt & NIH Common Fund Data Resources
Find proteins for P21675 (Homo sapiens)
Explore P21675 
Go to UniProtKB:  P21675
GTEx:  ENSG00000147133 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP21675
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on VQS

Download Ideal Coordinates CCD File 
B [auth A]N-(4-{4-[1-(cyclopropylsulfonyl)cyclopropyl]-6-[(3S)-3-methylmorpholin-4-yl]pyrimidin-2-yl}phenyl)-N'-(2-hydroxyethyl)thiourea
C24 H31 N5 O4 S2
Experimental Data & Validation

Experimental Data

  • Resolution: 2.20 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.230 
  • R-Value Observed: 0.231 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 49.29α = 90
b = 72.38β = 90
c = 77.11γ = 90
Software Package:
Software NamePurpose
XSCALEdata scaling
PDB_EXTRACTdata extraction
XDSdata reduction

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2021-09-22
    Type: Initial release
  • Version 1.1: 2022-03-09
    Changes: Database references
  • Version 1.2: 2022-03-23
    Changes: Database references
  • Version 1.3: 2023-10-18
    Changes: Data collection, Refinement description