2K4L

Solution structure of a 2:1C2-(2-naphthyl)pyrrolo[2,1-c][1,4]benzodiazepine (PBD) DNA adduct: molecular basis for unexpectedly high DNA helix stabilization.


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Solution structure of a 2:1 C2-(2-naphthyl) pyrrolo[2,1-c][1,4]benzodiazepine DNA adduct: molecular basis for unexpectedly high DNA helix stabilization.

Antonow, D.Barata, T.Jenkins, T.C.Parkinson, G.N.Howard, P.W.Thurston, D.E.Zloh, M.

(2008) Biochemistry 47: 11818-11829

  • DOI: 10.1021/bi801225q

  • PubMed Abstract: 
  • The naturally occurring pyrrolo[2,1- c][1,4]benzodiazepine (PBD) monomers such as sibiromycin, anthramycin, and tomaymycin form stable covalent adducts with duplex DNA at purine-guanine-purine sites. A correlative relationship between DNA-binding aff ...

    The naturally occurring pyrrolo[2,1- c][1,4]benzodiazepine (PBD) monomers such as sibiromycin, anthramycin, and tomaymycin form stable covalent adducts with duplex DNA at purine-guanine-purine sites. A correlative relationship between DNA-binding affinity, as measured by enhanced thermal denaturation temperature of calf thymus DNA ( T m), and cytotoxicity is well documented for these naturally occurring compounds and a range of synthetic analogues with sibiromycin having the highest Delta T m value (16.3 degrees C), reflecting favorable hydrogen-bonding interactions between the molecule and DNA bases. We report here that, surprisingly, the structurally simple synthetic C2-(2-naphthyl)-substituted pyrrolo[2,1- c][1,4]benzodiazepine monomer ( 5) has a Delta T m value (15.8 degrees C) similar to that of sibiromycin and significantly higher than the values for either anthramycin (13.0 degrees C) or tomaymycin (2.6 degrees C). 5 also has similar cytotoxic potency to sibiromycin which is widely regarded as the most potent naturally occurring PBD monomer. To investigate this, we have used NMR in conjunction with molecular dynamics to study the 2:1 adduct formed between 5 and the DNA duplex d(AATCTTTAAAGATT) 2. In contrast to the hydrogen-bonding interactions which predominate in the case of sibiromycin and anthramycin adducts, we have shown that the high binding affinity of 5 is due predominantly to hydrophobic (van der Waals) interactions. The high-resolution 2D NOESY, TOCSY, and COSY data obtained have also allowed unequivocal determination of the orientation of the PBD molecule (A-ring toward 3'-end of covalently bound strand), the stereochemistry at the C11 position of the PBD (C11 S), and the conformation of the C2-naphthyl ring which extends along the floor of the minor groove thus optimizing hydrophobic interactions with DNA. These results provide opportunities for future drug design in terms of extending planar hydrophobic groups at the C2 position of PBDs to maximize binding affinity.


    Related Citations: 
    • Parallel Synthesis of a Novel C2-Aryl Pyrrolo[2,1-c][1,4]benzodiazepine (PBD) Library
      Antonow, D.,Cooper, N.,Howard, P.W.,Thurston, D.E.
      (2007) J.Comb.Chem. 9: 437


    Organizational Affiliation

    Gene Targeting Drug Design Research Group, Spirogen Ltd., and The School of Pharmacy, University of London, 29/39 Brunswick Square, London, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsLengthOrganism
5'-D(*DAP*DAP*DTP*DCP*DTP*DTP*DTP*DAP*DAP*DAP*DGP*DAP*DTP*DT)-3'A,B14N/A
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PZD
Query on PZD

Download SDF File 
Download CCD File 
A, B
(11aS)-7,8-dimethoxy-2-naphthalen-2-yl-1,10,11,11a-tetrahydro-5H-pyrrolo[2,1-c][1,4]benzodiazepin-5-one
C24 H22 N2 O3
QCHVNYAXOGUSSL-IBGZPJMESA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-10-28
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance