1MP7

A Third Complex of Post-Activated Neocarzinostatin Chromophore with DNA. Bulge DNA Binding from the Minor Groove


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 
  • Conformers Submitted: 
  • Selection Criteria: all calculated structures submitted, back calculated data agree with experimental NOESY spectrum, structures with acceptable covalent geometry, structures with favorable non-bond energy, structures with the least restraint violations, structures with the lowest energy 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

New Complex of Post-Activated Neocarzinostatin Chromophore with DNA: Bulge DNA Binding from the Minor Groove

Xi, Z.Kappen, L.S.Goldberg, I.H.Gao, X.Kwon, Y.

(2003) Biochemistry 42: 1186-1198

  • DOI: 10.1021/bi0206210

  • PubMed Abstract: 
  • Neocarzinostatin (NCS-chrom), a natural enediyne antitumor antibiotic, undergoes either thiol-dependent or thiol-independent activation, resulting in distinctly different DNA cleavage patterns. Structures of two different post-activated NCS-chrom com ...

    Neocarzinostatin (NCS-chrom), a natural enediyne antitumor antibiotic, undergoes either thiol-dependent or thiol-independent activation, resulting in distinctly different DNA cleavage patterns. Structures of two different post-activated NCS-chrom complexes with DNA have been reported, revealing strikingly different binding modes that can be directly related to the specificity of DNA chain cleavage caused by NCS-chrom. The third structure described herein is based on recent studies demonstrating that glutathione (GSH) activated NCS-chrom efficiently cleaves DNA at specific single-base sites in sequences containing a putative single-base bulge. In this structure, the GSH post-activated NCS-chrom (NCSi-glu) binds to a decamer DNA, d(GCCAGAGAGC), from the minor groove. This binding triggers a conformational switch in DNA from a loose duplex in the free form to a single-strand, tightly folded hairpin containing a bulge adenosine embedded between a three base pair stem. The naphthoate aromatic moiety of NCSi-glu intercalates into a GG step flanked by the bulge site, and its substituent groups, the 2-N-methylfucosamine carbohydrate ring and the tetrahydroindacene, form a complementary minor groove binding surface, mostly interacting with the GCC strand in the duplex stem of DNA. The bulge site is stabilized by the interactions involving NCSi-glu naphthoate and GSH tripeptide. The positioning of NCSi-glu is such that only single-chain cleavage via hydrogen abstraction at the 5'-position of the third base C (which is opposite to the putative bulge base) in GCC is possible, explaining the observed single-base cleavage specificity. The reported structure of the NCSi-glu-bulge DNA complex reveals a third binding mode of the antibiotic and represents a new family of minor groove bulge DNA recognition structures. We predict analogue structures of NCSi-R (R = glu or other substituent groups) may be versatile probes for detecting the existence of various structures of nucleic acids. The NMR structure of this complex, in combination with the previously reported NCSi-gb-bulge DNA complex, offers models for specific recognition of DNA bulges of various sizes through binding to either the minor or the major groove and for single-chain cleavage of bulge DNA sequences.


    Organizational Affiliation

    Department of Chemistry, University of Houston, 136 Fleming Building, Houston, Texas 77004-5003, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsLengthOrganism
5'-D(*GP*CP*CP*AP*GP*AP*GP*AP*GP*C)-3'A10N/A
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NCG
Query on NCG

Download SDF File 
Download CCD File 
A
[(R)-4-((1,3-DIOXOLANE-2-OXY)-4-(S)-YL)-4-HYDROXY]-(R)-10-(2-METHYLAMINO-5-METHYL-2,6-DIDEOXYGALACTOPYRANOSYL-OXY)-(R)-11-(2-HYDROXY-5-METHYL-7-METHOXY-1-NAPHTHOYL-OXY)-(R)-12-S-GLUTATHIONYL-4,10,11,12-TETRAHYDROINDACENE
NCSI-GLU, NEOCARZINOSTATIN-GLUTATHIONE CHROMOPHORE
C45 H52 N4 O18 S
HZICOJKOTQKXNL-RKDHACFISA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 
  • Conformers Submitted: 
  • Selection Criteria: all calculated structures submitted, back calculated data agree with experimental NOESY spectrum, structures with acceptable covalent geometry, structures with favorable non-bond energy, structures with the least restraint violations, structures with the lowest energy 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-02-18
    Type: Initial release
  • Version 1.1: 2008-04-28
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance