6WGX image
Entry Detail
PDB ID:
6WGX
Title:
Cocrystal of BRD4(D1) with a selective inhibitor
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2020-04-06
Release Date:
2020-10-07
Method Details:
Experimental Method:
Resolution:
1.53 Å
R-Value Free:
0.18
R-Value Work:
0.14
R-Value Observed:
0.14
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Bromodomain-containing protein 4
Chain IDs:A, B
Chain Length:127
Number of Molecules:2
Biological Source:Homo sapiens
Primary Citation
Selective N-Terminal BET Bromodomain Inhibitors by Targeting Non-Conserved Residues and Structured Water Displacement*.
Angew.Chem.Int.Ed.Engl. 60 1220 1226 (2021)
PMID: 32975004 DOI: 10.1002/anie.202008625

Abstact

Bromodomain and extra-terminal (BET) family proteins, BRD2-4 and T, are important drug targets; however, the biological functions of each bromodomain remain ill-defined. Chemical probes that selectively inhibit a single BET bromodomain are lacking, although pan inhibitors of the first (D1), and second (D2), bromodomain are known. Here, we develop selective BET D1 inhibitors with preferred binding to BRD4 D1. In competitive inhibition assays, we show that our lead compound is 9-33 fold selective for BRD4 D1 over the other BET bromodomains. X-ray crystallography supports a role for the selectivity based on reorganization of a non-conserved lysine and displacement of an additional structured water in the BRD4 D1 binding site relative to our prior lead. Whereas pan-D1 inhibitors displace BRD4 from MYC enhancers, BRD4 D1 inhibition in MM.1S cells is insufficient for stopping Myc expression and may lead to its upregulation. Future analysis of BRD4 D1 gene regulation may shed light on differential BET bromodomain functions.

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Primary Citation of related structures