146d: Difference between revisions
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<StructureSection load='146d' size='340' side='right'caption='[[146d]]' scene=''> | <StructureSection load='146d' size='340' side='right'caption='[[146d]]' scene=''> | ||
== Structural highlights == | == Structural highlights == | ||
<table><tr><td colspan='2'>Full | <table><tr><td colspan='2'>[[146d]] is a 2 chain structure. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=146D OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=146D FirstGlance]. <br> | ||
</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=146d FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=146d OCA], [https://pdbe.org/146d PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=146d RCSB], [https://www.ebi.ac.uk/pdbsum/146d PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=146d ProSAT]</span></td></tr> | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Solution NMR</td></tr> | ||
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CRH:1,2-HYDRO-1-OXY-3,4-HYDRO-3-(1-METHOXY-2-OXY-3,4-DIHYDROXYPENTYL)-8,9-DIHYROXY-7-METHYLANTHRACENE'>CRH</scene>, <scene name='pdbligand=DDA:2,6-DIDEOXY-BETA-D-GLUCOSE'>DDA</scene>, <scene name='pdbligand=DDL:2,6-DIDEOXY-BETA-D-GALACTOSE'>DDL</scene>, <scene name='pdbligand=MDA:2,6-DIDEOXY-3+C-METHYL-D-RIBOPYRANOSIDE'>MDA</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</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=146d FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=146d OCA], [https://pdbe.org/146d PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=146d RCSB], [https://www.ebi.ac.uk/pdbsum/146d PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=146d ProSAT]</span></td></tr> | |||
</table> | </table> | ||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
We have characterized the NMR parameters for the complexes formed by the Mg(2+)-coordinated mithramycin dimer with self-complementary d(T-G-G-C-C-A) and d(T-C-G-C-G-A) duplexes. The solution structure of the latter complex has been determined using a combined NMR-molecular dynamics study including relaxation matrix refinement. The Mg(2+)-coordinated mithramycin dimer-d(T-C-G-C-G-A) complex exhibits a 2-fold center of symmetry with the divalent cation coordinated aglycons positioned opposite the central (G3-C4).(G3-C4) segment such that the aglycon C8 hydroxyl oxygens form symmetrical sequence-specific hydrogen bonds to guanine amino protons in the complex. The C-D-E trisaccharide segments of each monomer in the mithramycin dimer adopt extended conformations, are positioned inside the minor groove, and are directed toward either end of the duplex. The C-D saccharide component of one monomer and the aglycon of the other monomer in the mithramycin dimer share a widened minor groove with the hydrophobic edges of the C and D sugars interacting with individual strands of the duplex. The E-sugar ring is positioned in the floor of the minor groove, and its hydroxyl-bearing face interacts with both strands of the duplex through hydrogen-bonding and hydrophobic intermolecular interactions. The A-B disaccharide and the hydrophilic side chain form intermolecular contacts with the sugar-phosphate backbone in the complex. The antiparallel alignment of divalent cation coordinated monomers in the mithramycin dimer results in the two outwardly directed C-D-E trisaccharide segments generating a right-handed continuous hexasaccharide domain that spans six base pairs in the minor groove of the duplex. The solution structure of the mithramycin dimer-DNA complex reported in this study and the solution structure of the chromomycin dimer-DNA complex reported previously [Gao, X., Mirau, P., & Patel, D. J. (1992) J. Mol. Biol. 223, 259-279] show global similarities, as well as local differences that are of interest. All four nucleotides in the tetranucleotide segment of the duplex centered about the sequence-specific (G-C).(G-C) step adopt A-DNA sugar puckers and glycosidic torsion angles in the chromomycin dimer-DNA complex, while only the central cytidine adopts an A-DNA sugar pucker and glycosidic torsion angle in the mithramycin dimer-DNA complex.(ABSTRACT TRUNCATED AT 400 WORDS) | |||
Solution structure of the mithramycin dimer-DNA complex.,Sastry M, Patel DJ Biochemistry. 1993 Jul 6;32(26):6588-604. PMID:8329387<ref>PMID:8329387</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 146d" style="background-color:#fffaf0;"></div> | |||
== References == | |||
<references/> | |||
__TOC__ | __TOC__ | ||
</StructureSection> | </StructureSection> | ||