185D

SEQUENCE SPECIFICITY OF QUINOXALINE ANTIBIOTICS. 1. SOLUTION STRUCTURE OF A 1:1 COMPLEX BETWEEN TRIOSTIN A AND [D(GACGTC)]2 AND COMPARISON WITH THE SOLUTION STRUCTURE OF THE [N-MECYS3, N-MECYS7]TANDEM-[D(GATATC)]2 COMPLEX


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Submitted: 

wwPDB Validation 3D Report Full Report


This is version 1.5 of the entry. See complete history

Literature

Sequence Specificity of Quinoxaline Antibiotics. 1. Solution Structure of a 1:1 Complex between Triostin a and [D(Gacgtc)]2 and Comparison with the Solution Structure of the [N-Mecys3,N-Mecys7]Tandem-[D(Gatatc)]2 Complex.

Addess, K.J.Feigon, J.

(1994) Biochemistry 33: 12386


  • PubMed Abstract: 
  • Triostin A, a naturally occurring quinoxaline antibiotic that contains N-methyl groups on the valine and cysteine residues, binds sequence specifically to DNA at NCGN sites. [N-MeCys3,N-MeCys7]-TANDEM (CysMeTANDEM), a synthetic quinoxaline antibiotic ...

    Triostin A, a naturally occurring quinoxaline antibiotic that contains N-methyl groups on the valine and cysteine residues, binds sequence specifically to DNA at NCGN sites. [N-MeCys3,N-MeCys7]-TANDEM (CysMeTANDEM), a synthetic quinoxaline antibiotic, differs in its chemical structure from triostin A only at the valine residues, which contain no N-methyl substituents. CysMeTANDEM has a sequence specificity different from triostin A, binding specifically to DNA at NTAN sites. To understand the factors that determine the sequence specificity of these quinoxaline antibiotics, the solution structure of a 1:1 complex of triostin A with the DNA hexamer [d(GACGTC)]2 has been determined using NMR-derived distance and dihedral angle restraints. The solution structure of the triostin A-[d(GACGTC)]2 complex is compared directly to the solution structure of a 1:1 complex of CysMeTANDEM with [d(GATATC)]2 and is also compared to the crystal structure of 2:1 complex of triostin A with [d(CGTACG)]2. Triostin A binds to [d(GACGTC)]2 as a bis-intercalator around the CpG step, and the peptide ring of the drug binds in the minor groove of the DNA. The central C.G base pairs of the complex are underwound with an average helical twist angle of approximately -9.0 degrees and buckle inward by about 25 degrees. There are intermolecular hydrogen bonds between each of the Ala NH and the GN3 protons of the CpG binding site. Similar structural features are observed in the solution structure of the CysMeTANDEM-[d(GATATC)]2 complex. However, in the structure of the triostin A-[d(GACGTC)]2 complex, two intermolecular hydrogen bonds between each of the Ala CO oxygens of the drug and the 2-amino protons of guanine are observed. These hydrogen bonds do not form in the CysMeTANDEM-DNA complex. Instead, CysMeTANDEM contains two intramolecular hydrogen bonds between the Ala CO atoms and the Val amide protons, making the Ala CO atoms unavailable to form two intermolecular hydrogen bonds. The role of these intermolecular hydrogen bonds in the CpG specificity of triostin A is discussed.


    Related Citations: 
    • Solution Structure of a Complex between [N-Mecys3,N-Mecys7]Tandem and [D(Gatatc)]2
      Addess, K.J.,Sinsheimer, J.S.,Feigon, J.
      (1993) Biochemistry 32: 2498


    Organizational Affiliation

    Department of Chemistry and Biochemistry, University of California, Los Angeles 90024-1569.




Macromolecules

Find similar proteins by: Sequence  |  Structure


Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
TRIOSTIN A
A
8N/AN/A
Protein Feature View is not available: No corresponding UniProt sequence found.
Entity ID: 2
MoleculeChainsLengthOrganism
DNA (5'-D(*GP*AP*CP*GP*TP*C)-3')C,D6N/A
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
QUI
Query on QUI

Download SDF File 
Download CCD File 
A
2-CARBOXYQUINOXALINE
C9 H6 N2 O2
UPUZGXILYFKSGE-UHFFFAOYSA-N
 Ligand Interaction
Biologically Interesting Molecules 1 Unique
IDChainsNameType/Class2D Diagram3D Interactions
PRD_000488
Query on PRD_000488
ATRIOSTIN ACyclic depsipeptide / Anticancer

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Experimental Data & Validation

Experimental Data

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

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1995-02-07
    Type: Initial release
  • Version 1.1: 2011-06-14
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2011-07-27
    Type: Atomic model, Database references, Derived calculations, Non-polymer description, Structure summary
  • Version 1.4: 2013-02-27
    Type: Other
  • Version 1.5: 2017-11-01
    Type: Advisory, Derived calculations, Other