View source for 1xvk


==X-ray structure of an Echinomycin-(GCGTACGC)2 complex==
<StructureSection load='1xvk' size='340' side='right'caption='[[1xvk]], [[Resolution|resolution]] 1.26&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1xvk]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Streptomyces_echinatus Streptomyces echinatus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1XVK OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1XVK FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.26&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=DSN:D-SERINE'>DSN</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=MVA:N-METHYLVALINE'>MVA</scene>, <scene name='pdbligand=N2C:N,S-DIMETHYLCYSTEINE'>N2C</scene>, <scene name='pdbligand=NCY:N-METHYLCYSTEINE'>NCY</scene>, <scene name='pdbligand=QUI:2-CARBOXYQUINOXALINE'>QUI</scene></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1xvk FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1xvk OCA], [https://pdbe.org/1xvk PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1xvk RCSB], [https://www.ebi.ac.uk/pdbsum/1xvk PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1xvk ProSAT]</span></td></tr>
</table>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The structure of the bis-intercalation complex of the depsipeptide antibiotic echinomycin with (CGTACG)2 has been redetermined at a higher resolution (1.4 A) and new high-resolution structures (1.1-1.5 A) are reported for the complexes of echinomycin with (GCGTACGC)2 (at both low and high ionic strengths) and (ACGTACGT)2. The structures show the expected Hoogsteen pairing for the base pairs flanking the intercalating chromophores on the outside and Watson-Crick pairing for both base pairs enclosed by the echinomycin. In the octamer complexes but not the hexamer complex, the echinomycin molecule, which would possess a molecular twofold axis were it not for the thioacetal bridge, shows twofold disorder. In all the structures the stacking of the base pairs and chromophores is extended by intermolecular stacking. The structures provide more precise details of the hydrogen bonding and other interactions between the bis-intercalating antibiotics and the duplex DNA than were previously available.

Structures of complexes between echinomycin and duplex DNA.,Cuesta-Seijo JA, Sheldrick GM Acta Crystallogr D Biol Crystallogr. 2005 Apr;61(Pt 4):442-8. Epub 2005, Mar 24. PMID:15805599<ref>PMID:15805599</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 1xvk" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Streptomyces echinatus]]
[[Category: Cuesta-Seijo JA]]
[[Category: Sheldrick GM]]