View source for 4daq


==Crystal structure of an intramolecular human telomeric DNA G-quadruplex 21-mer bound by the naphthalene diimide compound BMSG-SH-3==
<StructureSection load='4daq' size='340' side='right'caption='[[4daq]], [[Resolution|resolution]] 2.75&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4daq]] is a 1 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4DAQ OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4DAQ FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=K:POTASSIUM+ION'>K</scene>, <scene name='pdbligand=R8G:2,7-BIS[3-(4-METHYLPIPERAZIN-1-YL)PROPYL]-4,9-BIS{[3-(4-METHYLPIPERAZIN-1-YL)PROPYL]AMINO}BENZO[LMN][3,8]PHENANTHROLINE-1,3,6,8(2H,7H)-TETRONE'>R8G</scene></td></tr>
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[4da3|4da3]], [[3sc8|3sc8]], [[3uyh|3uyh]], [[3t5e|3t5e]]</td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4daq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4daq OCA], [http://pdbe.org/4daq PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4daq RCSB], [http://www.ebi.ac.uk/pdbsum/4daq PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4daq ProSAT]</span></td></tr>
</table>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Tetra-substituted naphthalene diimide (ND) derivatives with positively charged termini are potent stabilizers of human telomeric and gene promoter DNA quadruplexes and inhibit the growth of human cancer cells in vitro and in vivo. The present study reports the enhancement of the pharmacological properties of earlier ND compounds using structure-based design. Crystal structures of three complexes with human telomeric intramolecular quadruplexes demonstrate that two of the four strongly basic N-methyl-piperazine groups can be replaced by less basic morpholine groups with no loss of intermolecular interactions in the grooves of the quadruplex. The new compounds retain high affinity to human telomeric quadruplex DNA, but are 10-fold more potent against the MIA PaCa-2 pancreatic cancer cell line, with IC50 values of ~10 nM. The lead compound induces cellular senescence, but does not inhibit telomerase activity at the nanomolar dosage levels required for inhibition of cellular proliferation. Gene array qPCR analysis of MIA PaCa-2 cells treated with the lead compound revealed significant dose-dependent modulation of a distinct sub-set of genes including strong induction of DNA damage responsive genes CDKN1A, DDIT3, GADD45A/G and PPM1D, and repression of genes involved in telomere maintenance, including hPOT1 and PARP1.

Structure-based design and evaluation of naphthalene diimide G-quadruplex ligands as telomere targeting agents in pancreatic cancer cells.,Micco M, Collie GW, Dale AG, Onhmacht SA, Pazitna I, Gunaratnam M, Reszka AP, Neidle S J Med Chem. 2013 Mar 21. PMID:23514618<ref>PMID:23514618</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4daq" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Collie, G W]]
[[Category: Neidle, S]]
[[Category: Dna]]
[[Category: G-quadruplex]]
[[Category: Intramolecular]]
[[Category: Ligand-complex]]