2WFY

Truncation and Optimisation of Peptide Inhibitors of CDK2, Cyclin A Through Structure Guided Design

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.53 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.193 
  • R-Value Observed: 0.195 

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Literature

Truncation and Optimisation of Peptide Inhibitors of Cyclin-Dependent Kinase 2-Cyclin a Through Structure-Guided Design.

Kontopidis, G., Andrews, M.J., Mcinnes, C., Plater, A., Innes, L., Renachowski, S., Cowan, A., Fischer, P.M.

(2009) ChemMedChem 4: 1120

  • DOI: 10.1002/cmdc.200900093
  • Primary Citation of Related Structures:  
    2WEV, 2WFY, 2WHB

  • PubMed Abstract: 

    • Peptides that inhibit cyclin-dependent kinase 2 by blocking the macromolecular substrate recruitment site of cyclin A were simplified, for example, by replacement of dipeptide units with beta-amino acids. The smallest inhibitor retaining activity was a tripeptide, whose binding mode was confirmed by X-ray crystallography ...

    Peptides that inhibit cyclin-dependent kinase 2 by blocking the macromolecular substrate recruitment site of cyclin A were simplified, for example, by replacement of dipeptide units with beta-amino acids. The smallest inhibitor retaining activity was a tripeptide, whose binding mode was confirmed by X-ray crystallography. This result suggests that nonpeptidic cyclin groove inhibitors may be feasible therapeutic agents.The cyclin-dependent kinase 2-cyclin A complex is an important regulator of the DNA-synthesis phase of the mammalian cell cycle, which is frequently deregulated in cancer. Rather than blocking the ATP-binding site of the apparently redundant kinase subunit, targeting the binding site for macromolecular substrates and regulatory proteins of cyclin A represents a promising strategy to enforce tumour-selective apoptosis. The cyclin-binding groove can be blocked with comparatively small synthetic peptides, which indirectly leads to inhibition of kinase function, but these peptides are metabolically labile and membrane impermeable. As part of our ongoing effort to develop more druglike peptidomimetics derived from cyclin-groove-binding peptides, we report the results of our studies aimed at a detailed understanding of the structural determinants required for effective binding. Using a combination of peptide synthesis, biochemical assays and X-ray crystallography, we show that it is possible to simplify peptide structures through the replacement of dipeptide units in which one of the residues is not directly involved in binding, through the introduction of beta-amino acid residues that retain only the dipeptide residue side chain that is important for binding. This approach also allowed us to probe spatial constraints in general, as well as the importance of peptide backbone hydrogen-bonding functions. Our identification of potent beta-homoleucine-containing tetrapeptide inhibitors, as well as the finding that an optimised N-terminally acetylated tripeptide retains some cyclin A-binding affinity, suggest that the pharmacological targeting of the cyclin A binding groove may be feasible.

    Organizational Affiliation: 

    Veterinary School, University of Thessaly, Karditsa 43100, Greece.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CELL DIVISION PROTEIN KINASE 2A, C298Homo sapiensMutation(s): 0 
Gene Names: CDK2, CDKN2
EC: 2.7.1.37 (PDB Primary Data), 2.7.11.22 (UniProt)
UniProt & NIH Common Fund Data Resources
Find proteins for P24941 (Homo sapiens)
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Go to UniProtKB:  P24941
PHAROS:  P24941
Entity Groups  
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UniProt GroupP24941
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
CYCLIN-A2B, D260Homo sapiensMutation(s): 0 
Gene Names: CCNA2, CCN1, CCNA
UniProt & NIH Common Fund Data Resources
Find proteins for P20248 (Homo sapiens)
Explore P20248 
Go to UniProtKB:  P20248
PHAROS:  P20248
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UniProt GroupP20248
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  • Reference Sequence

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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
ARG-ARG-B3L-PHEE, F6synthetic constructMutation(s): 0 
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.53 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.193 
  • R-Value Observed: 0.195 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 74.621α = 90
b = 115.813β = 90
c = 157.911γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling
MOLREPphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-06-09
    Type: Initial release
  • Version 1.1: 2011-10-12
    Changes: Database references, Derived calculations, Non-polymer description, Other, Version format compliance
  • Version 1.2: 2016-12-28
    Changes: Derived calculations, Source and taxonomy