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Cooperative stabilization of Zn(2+):DNA complexes through netropsin binding in the minor groove of FdU-substituted DNA.
MedLine Citation:
PMID:  23153072     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The simultaneous binding of netropsin in the minor groove and Zn(2+) in the major groove of a DNA hairpin that includes 10 consecutive FdU nucleotides at the 3'-terminus (3'FdU) was demonstrated based upon NMR spectroscopy, circular dichroism (CD), and computational modeling studies. The resulting Zn(2+)/netropsin: 3'FdU complex had very high thermal stability with aspects of the complex intact at 85 °C, conditions that result in complete dissociation of Mg(2+) complexes. CD and (19)F NMR spectroscopy were consistent with Zn(2+) binding in the major groove of the DNA duplex and utilizing F5 and O4 of consecutive FdU nucleotides as ligands with FdU nucleotides hemi-deprotonated in the complex. Netropsin is bound in the minor groove of the DNA duplex based upon 2D NOESY data demonstrating contacts between AH2 (1)H and netropsin (1)H resonances. The Zn(2+)/netropsin: 3'FdU complex displayed increased cytotoxicity towards PC3 prostate cancer (PCa) cells relative to the constituent components or separate complexes (e.g. Zn(2+):3'FdU) indicating that this new structural motif may be therapeutically useful for PCa treatment. An animated interactive 3D complement (I3DC) is available in Proteopedia at http://proteopedia.org/w/Journal:JBSD:32.
Authors:
Supratim Ghosh; Freddie R Salsbury; David A Horita; William H Gmeiner
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-11-16
Journal Detail:
Title:  Journal of biomolecular structure & dynamics     Volume:  -     ISSN:  1538-0254     ISO Abbreviation:  J. Biomol. Struct. Dyn.     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-16     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8404176     Medline TA:  J Biomol Struct Dyn     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
a Department of Cancer Biology , Wake Forest School of Medicine , Winston-Salem , NC , USA.
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