1LEJ

NMR Structure of a 1:1 Complex of Polyamide (Im-Py-Beta-Im-Beta-Im-Py-Beta-Dp) with the Tridecamer DNA Duplex 5'-CCAAAGAGAAGCG-3'


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 40 
  • Conformers Submitted: 11 
  • Selection Criteria: structures with the least restraint violations 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure of a beta-alanine-linked polyamide bound to a full helical turn of purine tract DNA in the 1:1 motif.

Urbach, A.R.Love, J.J.Ross, S.A.Dervan, P.B.

(2002) J.Mol.Biol. 320: 55-71

  • DOI: 10.1016/S0022-2836(02)00430-8

  • PubMed Abstract: 
  • Polyamides composed of N-methylpyrrole (Py), N-methylimidazole (Im) and N-methylhydroxypyrrole (Hp) amino acids linked by beta-alanine (beta) bind the minor groove of DNA in 1:1 and 2:1 ligand to DNA stoichiometries. Although the energetics and struc ...

    Polyamides composed of N-methylpyrrole (Py), N-methylimidazole (Im) and N-methylhydroxypyrrole (Hp) amino acids linked by beta-alanine (beta) bind the minor groove of DNA in 1:1 and 2:1 ligand to DNA stoichiometries. Although the energetics and structure of the 2:1 complex has been explored extensively, there is remarkably less understood about 1:1 recognition beyond the initial studies on netropsin and distamycin. We present here the 1:1 solution structure of ImPy-beta-Im-beta-ImPy-beta-Dp bound in a single orientation to its match site within the DNA duplex 5'-CCAAAGAGAAGCG-3'.5'-CGCTTCTCTTTGG-3' (match site in bold), as determined by 2D (1)H NMR methods. The representative ensemble of 12 conformers has no distance constraint violations greater than 0.13 A and a pairwise RMSD over the binding site of 0.80 A. Intermolecular NOEs place the polyamide deep inside the minor groove, and oriented N-C with the 3'-5' direction of the purine-rich strand. Analysis of the high-resolution structure reveals the ligand bound 1:1 completely within the minor groove for a full turn of the DNA helix. The DNA is B-form (average rise=3.3 A, twist=38 degrees ) with a narrow minor groove closing down to 3.0-4.5 A in the binding site. The ligand and DNA are aligned in register, with each polyamide NH group forming bifurcated hydrogen bonds of similar length to purine N3 and pyrimidine O2 atoms on the floor of the minor groove. Each imidazole group is hydrogen bonded via its N3 atom to its proximal guanine's exocyclic amino group. The important roles of beta-alanine and imidazole for 1:1 binding are discussed.


    Organizational Affiliation

    Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsLengthOrganism
5'-D(*CP*CP*AP*AP*AP*GP*AP*GP*AP*AP*GP*CP*G)-3'A13N/A
Entity ID: 2
MoleculeChainsLengthOrganism
5'-D(*CP*GP*CP*TP*TP*CP*TP*CP*TP*TP*TP*GP*G)-3'B13N/A
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
P11
Query on P11

Download SDF File 
Download CCD File 
A
IMIDAZOLE-PYRROLE-BETA ALANINE-IMIDAZOLE-BETA ALANINE-IMIDAZOLE-PYRROLE-BETA ALANINE-DIMETHYLAMINO PROPYLAMIDE
C41 H56 N17 O8
XZTAUBIMIILCRT-UHFFFAOYSA-O
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 40 
  • Conformers Submitted: 11 
  • Selection Criteria: structures with the least restraint violations 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-05-08
    Type: Initial release
  • Version 1.1: 2008-04-28
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance