4CRL

Crystal structure of human CDK8-Cyclin C in complex with cortistatin A


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.199 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Literature

Mediator Kinase Inhibition Further Activates Super-Enhancer- Associated Genes in Aml

Pelish, H.E.Liau, B.B.Nitulescu, I.I.Tangpeerachaikul, A.Poss, Z.C.Da Silva, D.H.Caruso, B.T.Arefolov, A.Fadeyi, O.Christie, A.L.Du, K.Banka, D.Schneider, E.V.Jestel, A.Zou, G.Si, C.Ebmeier, C.C.Bronson, R.T.Krivtsov, A.V.Myers, A.G.Kohl, N.E.Kung, A.L.Armstrong, S.A.Lemieux, M.E.Taatjes, D.J.Shair, M.D.

(2015) Nature 526: 273

  • DOI: 10.1038/nature14904

  • PubMed Abstract: 
  • Super-enhancers (SEs), which are composed of large clusters of enhancers densely loaded with the Mediator complex, transcription factors and chromatin regulators, drive high expression of genes implicated in cell identity and disease, such as lineage ...

    Super-enhancers (SEs), which are composed of large clusters of enhancers densely loaded with the Mediator complex, transcription factors and chromatin regulators, drive high expression of genes implicated in cell identity and disease, such as lineage-controlling transcription factors and oncogenes. BRD4 and CDK7 are positive regulators of SE-mediated transcription. By contrast, negative regulators of SE-associated genes have not been well described. Here we show that the Mediator-associated kinases cyclin-dependent kinase 8 (CDK8) and CDK19 restrain increased activation of key SE-associated genes in acute myeloid leukaemia (AML) cells. We report that the natural product cortistatin A (CA) selectively inhibits Mediator kinases, has anti-leukaemic activity in vitro and in vivo, and disproportionately induces upregulation of SE-associated genes in CA-sensitive AML cell lines but not in CA-insensitive cell lines. In AML cells, CA upregulated SE-associated genes with tumour suppressor and lineage-controlling functions, including the transcription factors CEBPA, IRF8, IRF1 and ETV6 (refs 6-8). The BRD4 inhibitor I-BET151 downregulated these SE-associated genes, yet also has anti-leukaemic activity. Individually increasing or decreasing the expression of these transcription factors suppressed AML cell growth, providing evidence that leukaemia cells are sensitive to the dosage of SE-associated genes. Our results demonstrate that Mediator kinases can negatively regulate SE-associated gene expression in specific cell types, and can be pharmacologically targeted as a therapeutic approach to AML.


    Organizational Affiliation

    Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CYCLIN-DEPENDENT KINASE 8
A
406Homo sapiensMutation(s): 0 
Gene Names: CDK8
EC: 2.7.11.22, 2.7.11.23
Find proteins for P49336 (Homo sapiens)
Go to Gene View: CDK8
Go to UniProtKB:  P49336
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
CYCLIN-C
B
285Homo sapiensMutation(s): 0 
Gene Names: CCNC
Find proteins for P24863 (Homo sapiens)
Go to Gene View: CCNC
Go to UniProtKB:  P24863
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
FMT
Query on FMT

Download SDF File 
Download CCD File 
A, B
FORMIC ACID
C H2 O2
BDAGIHXWWSANSR-UHFFFAOYSA-N
 Ligand Interaction
C1I
Query on C1I

Download SDF File 
Download CCD File 
A
CORTISTATIN A
C30 H36 N2 O3
KSGZCKSNTAJOJS-DZBMUNJRSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
C1IKd: 0.195 nM BINDINGMOAD
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.199 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 70.490α = 90.00
b = 71.252β = 90.00
c = 171.247γ = 90.00
Software Package:
Software NamePurpose
XSCALEdata scaling
REFMACrefinement
XDSdata reduction
MOLREPphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-09-23
    Type: Initial release
  • Version 1.1: 2015-10-07
    Type: Database references
  • Version 1.2: 2015-10-14
    Type: Database references
  • Version 1.3: 2019-01-30
    Type: Advisory, Data collection, Experimental preparation, Other
  • Version 1.4: 2019-02-06
    Type: Data collection, Experimental preparation