5WFC

Humanized mutant of the Chaetomium thermophilum Polycomb Repressive Complex 2 bound to the inhibitor GSK343


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.282 Å
  • R-Value Free: 0.203 
  • R-Value Work: 0.167 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

An Evolutionarily Conserved Structural Platform for PRC2 Inhibition by a Class of Ezh2 Inhibitors.

Bratkowski, M.Yang, X.Liu, X.

(2018) Sci Rep 8: 9092-9092

  • DOI: 10.1038/s41598-018-27175-w
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Polycomb repressive complex 2 (PRC2) mediates trimethylation of histone H3K27 (H3K27me3), an epigenetic hallmark for repressed chromatin. Overactive mutants of the histone lysine methyltransferase subunit of PRC2, Ezh2, are found in various types of ...

    Polycomb repressive complex 2 (PRC2) mediates trimethylation of histone H3K27 (H3K27me3), an epigenetic hallmark for repressed chromatin. Overactive mutants of the histone lysine methyltransferase subunit of PRC2, Ezh2, are found in various types of cancers. Pyridone-containing inhibitors such as GSK126 compete with S-adenosylmethionine (SAM) for Ezh2 binding and effectively inhibit PRC2 activity. PRC2 from the thermophilic fungus Chaetomium thermophilum (ct) is functionally similar to the human version in several regards and has the added advantage of producing high-resolution crystal structures, although inhibitor-bound structures of human or human/chameleon PRC2 are also available at up to 2.6 Å resolution. We solved crystal structures of both human and ctPRC2 bound to GSK126 and the structurally similar inhibitor GSK343. While the two organisms feature a disparate degree of inhibitor potency, surprisingly, GSK126 binds in a similar manner in both structures. Structure-guided protein engineering of the drug binding pocket allowed us to introduce humanizing mutations into ctEzh2 to produce a ctPRC2 variant that is more susceptible to GSK126 inhibition. Additional analysis indicated that an evolutionarily conserved structural platform dictates a unique mode of GSK126 binding, suggesting a mechanism of drug selectivity. The existing drug scaffold may thus be used to probe the function and cellular regulation of PRC2 in a wide spectrum of organisms, ranging from fungi to humans.


    Organizational Affiliation

    Cecil H. and Ida Green Center for Reproductive Biology Sciences and Division of Basic Research, Department of Obstetrics and Gynecology, Department of Biophysics, UT Southwestern Medical Center, Dallas, TX, 75390, USA.,Cecil H. and Ida Green Center for Reproductive Biology Sciences and Division of Basic Research, Department of Obstetrics and Gynecology, Department of Biophysics, UT Southwestern Medical Center, Dallas, TX, 75390, USA. xin.liu@utsouthwestern.edu.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Polycomb Protein EED
A
605Chaetomium thermophilum (strain DSM 1495 / CBS 144.50 / IMI 039719)Mutation(s): 0 
Find proteins for G0S8H7 (Chaetomium thermophilum (strain DSM 1495 / CBS 144.50 / IMI 039719))
Go to UniProtKB:  G0S8H7
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Histone-lysine-N-methyltransferase EZH2, Polycomb protein SUZ12 chimera
B
936Chaetomium thermophilum (strain DSM 1495 / CBS 144.50 / IMI 039719)Mutation(s): 7 
Find proteins for G0SDW4 (Chaetomium thermophilum (strain DSM 1495 / CBS 144.50 / IMI 039719))
Go to UniProtKB:  G0SDW4
Find proteins for G0RYC6 (Chaetomium thermophilum (strain DSM 1495 / CBS 144.50 / IMI 039719))
Go to UniProtKB:  G0RYC6
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Histone H3.1
D
11Homo sapiensMutation(s): 0 
Gene Names: H3C1, H3C2, H3C3, H3C4, H3C6, H3C7, H3C8, H3C10, H3C11, H3C12 (H3FA, HIST1H3A, H3FL, HIST1H3B, H3FC HIST1H3C, H3FB, HIST1H3D, H3FD, HIST1H3E, H3FI, HIST1H3F, H3FH, HIST1H3G, H3FK, HIST1H3H, H3FF, HIST1H3I, H3FJ, HIST1H3J)
Find proteins for P68431 (Homo sapiens)
Go to UniProtKB:  P68431
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
B
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
A97
Query on A97

Download SDF File 
Download CCD File 
B
N-[(6-methyl-2-oxo-4-propyl-1,2-dihydropyridin-3-yl)methyl]-6-[2-(4-methylpiperazin-1-yl)pyridin-4-yl]-1-(propan-2-yl)-1H-indazole-4-carboxamide
C31 H39 N7 O2
ULNXAWLQFZMIHX-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
M3L
Query on M3L
D
L-PEPTIDE LINKINGC9 H21 N2 O2LYS
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.282 Å
  • R-Value Free: 0.203 
  • R-Value Work: 0.167 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 117.587α = 90.00
b = 137.794β = 90.00
c = 222.332γ = 90.00
Software Package:
Software NamePurpose
HKL-3000data scaling
HKL-3000data reduction
PHENIXrefinement
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of HealthUnited States114576
Welch FoundationUnited StatesI-1790
Cancer Prevention and Research Institute of TexasUnited StatesR1119
Rita Allen FoundationUnited States--
University of Texas Medical Center Endowed Scholar FundUnited States--

Revision History 

  • Version 1.0: 2018-06-27
    Type: Initial release
  • Version 1.1: 2019-04-24
    Type: Advisory, Author supporting evidence, Data collection, Derived calculations