107D

SOLUTION STRUCTURE OF THE COVALENT DUOCARMYCIN A-DNA DUPLEX COMPLEX


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Submitted: 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Solution structure of the covalent duocarmycin A-DNA duplex complex.

Lin, C.H.Patel, D.J.

(1995) J.Mol.Biol. 248: 162-179

  • DOI: 10.1006/jmbi.1995.0209

  • PubMed Abstract: 
  • Duocarmycin A is an antitumour antibiotic that binds covalently to the minor groove N-3 position of adenine with sequence specificity for the 3'-adenine in a d(A-A-A-A) tract in duplex DNA. The adenine ring becomes protonated on duocarmycin adduct fo ...

    Duocarmycin A is an antitumour antibiotic that binds covalently to the minor groove N-3 position of adenine with sequence specificity for the 3'-adenine in a d(A-A-A-A) tract in duplex DNA. The adenine ring becomes protonated on duocarmycin adduct formation resulting in charge delocalization over the purine ring system. We report on the solution structure of duocarmycin A bound site specifically to A12 (designated *A12+) in the sequence context d(T3-T4-T5-T6).d(A9-A10-A11-*A12+) within a hairpin duplex. The solution structure was solved based on a combined NMR-molecular dynamics study including NOE based intensity refinement. The A and B-rings of duocarmycin are positioned deep within the walls of the minor groove with the B-ring (which is furthest from the covalent linkage site) directed towards the 5'-end of the modified strand. Duocarmycin adopts an extended conformation and is aligned at approximately 45 degrees to the helix axis with its non-polar concave edges interacting with the floor of the minor groove while its polar edges are sandwiched within the walls of the minor groove. The T3.*A12+ modification site pair forms a weak central Watson-Crick hydrogen bond in contrast to all A.T and G.C pairs, which align through standard Watson-Crick pairing in the complex. The helical parameters are consistent with a minimally perturbed right-handed duplex in the complex with minor groove width and x-displacement parameters indicative of a B-form helix. A striking feature of the complex is the positioning of duocarmycin A within the walls of the minor groove resulting in upfield shifts of the minor groove sugar protons, as well as backbone proton and phosphorus resonances in the DNA segment spanning the binding site.


    Organizational Affiliation

    Cellular Biochemistry and Biophysics Program, Memorial Sloan-Kettering Cancer Center, New York, NY 10021, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsLengthOrganism
DNA (5'-D(*CP*CP*TP*TP*TP*TP*C)-3')A7N/A
Entity ID: 2
MoleculeChainsLengthOrganism
DNA (5'-D(*GP*AP*AP*AP*AP*GP*G)-3')B7N/A
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
DUO
Query on DUO

Download SDF File 
Download CCD File 
B
4-HYDROXY-2,8-DIMETHYL-1-OXO-6-(4,5,6-TRIMETHOXY-1H-INDOLE-2-CARBONYL)-1,2,3,6,7,8-HEXAHYDRO-3,6-DIAZA-AS-INDACENE-2-CARBOXYLIC ACID METHYL ESTER
DUOCARMYCIN A
C26 H27 N3 O8
WQAYQZWERWNDPV-RPHGYIDUSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Submitted: 
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
X-PLORphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 1995-01-17 
  • Released Date: 1995-05-08 
  • Deposition Author(s): Lin, C.H., Patel, D.J.

Revision History 

  • Version 1.0: 1995-05-08
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance