3LQ5

Structure of CDK9/CyclinT in complex with S-CR8


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.215 
  • R-Value Work: 0.162 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

CDK Inhibitors Roscovitine and CR8 Trigger Mcl-1 Down-Regulation and Apoptotic Cell Death in Neuroblastoma Cells

Bettayeb, K.Baunbak, D.Delehouze, C.Loaec, N.Hole, A.J.Baumli, S.Endicott, J.A.Douc-Rasy, S.Benard, J.Oumata, N.Galons, H.Meijer, L.

(2010) Genes Cancer 1: 369-380

  • DOI: 10.1177/1947601910369817

  • PubMed Abstract: 
  • Neuroblastoma (NB), the most frequent extracranial solid tumor of children accounting for nearly 15% of all childhood cancer mortality, displays overexpression of antiapoptotic Bcl-2 and Mcl-1 in aggressive forms of the disease. The clinical phase 2 ...

    Neuroblastoma (NB), the most frequent extracranial solid tumor of children accounting for nearly 15% of all childhood cancer mortality, displays overexpression of antiapoptotic Bcl-2 and Mcl-1 in aggressive forms of the disease. The clinical phase 2 drug roscovitine (CYC202, seliciclib), a relatively selective inhibitor of cyclin-dependent kinases (CDKs), and CR8, a recently developed and more potent analog, induce concentration-dependent apoptotic cell death of NB cells (average IC(50) values: 24.2 µM and 0.4 µM for roscovitine and CR8, respectively). Both roscovitine and CR8 trigger rapid down-regulation of the short-lived survival factor Mcl-1 in the 9 investigated human NB cell lines. This effect was further analyzed in the human SH-SY5Y NB cell line. Down-regulation of Mcl-1 appears to depend on inhibition of CDKs rather than on interaction of roscovitine and CR8 with their secondary targets. CR8 is an adenosine triphosphate-competitive inhibitor of CDK9, and the structure of a CDK9/cyclin T/CR8 complex is described. Mcl-1 down-regulation occurs both at the mRNA and protein levels. This effect can be accounted for by a reduction in Mcl-1 protein synthesis, under stable Mcl-1 degradation conditions. Mcl-1 down-regulation is accompanied by a transient increase in free Noxa, a proapoptotic factor. Mcl-1 down-regulation occurs independently of the presence or up-regulation of p53 and of the MYCN status. Taken together, these results suggest that the clinical drug roscovitine and its novel analog CR8 induce apoptotic tumor cell death by down-regulating Mcl-1, a key survival factor expressed in all NB cell lines. CDK inhibition may thus constitute a new approach to treat refractory high-risk NB.


    Organizational Affiliation

    C.N.R.S. USR3151, 'Protein Phosphorylation & Human Disease' Group, Station Biologique, Bretagne, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Cell division protein kinase 9
A
331Homo sapiensMutation(s): 0 
Gene Names: CDK9 (CDC2L4, TAK)
EC: 2.7.11.22, 2.7.11.23
Find proteins for P50750 (Homo sapiens)
Go to Gene View: CDK9
Go to UniProtKB:  P50750
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Cyclin-T1
B
260Homo sapiensMutation(s): 3 
Gene Names: CCNT1
Find proteins for O60563 (Homo sapiens)
Go to Gene View: CCNT1
Go to UniProtKB:  O60563
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SLQ
Query on SLQ

Download SDF File 
Download CCD File 
A
(2S)-2-({9-(1-methylethyl)-6-[(4-pyridin-2-ylbenzyl)amino]-9H-purin-2-yl}amino)butan-1-ol
C24 H29 N7 O
HOCBJBNQIQQQGT-IBGZPJMESA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
TPO
Query on TPO
A
L-PEPTIDE LINKINGC4 H10 N O6 PTHR
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
SLQIC50: 110 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.215 
  • R-Value Work: 0.162 
  • Space Group: H 3
Unit Cell:
Length (Å)Angle (°)
a = 173.249α = 90.00
b = 173.249β = 90.00
c = 99.241γ = 120.00
Software Package:
Software NamePurpose
PHENIXrefinement
PHENIXphasing
PHENIXmodel building
MOSFLMdata reduction
ADSCdata collection
SCALAdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-01-19
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2012-04-25
    Type: Database references, Refinement description, Structure summary