2mav
From Proteopedia
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| - | ''' | + | ==NMR Structure of N2-IQ-dG at the G3 position in the NarI recognition sequence== |
| + | <StructureSection load='2mav' size='340' side='right' caption='[[2mav]], [[NMR_Ensembles_of_Models | 10 NMR models]]' scene=''> | ||
| + | == Structural highlights == | ||
| + | <table><tr><td colspan='2'>[[2mav]] is a 2 chain structure. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2MAV OCA]. <br> | ||
| + | </td></tr><tr><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=IQG:N-(2-AMINO-3-METHYL-3H-IMIDAZO[4,5-F]QUINOLIN-5-YL)-2-DEOXYGUANOSINE+5-(DIHYDROGEN+PHOSPHATE)'>IQG</scene></td></tr> | ||
| + | <tr><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Glucokinase Glucokinase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.1.2 2.7.1.2] </span></td></tr> | ||
| + | <tr><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2mav FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2mav OCA], [http://www.rcsb.org/pdb/explore.do?structureId=2mav RCSB], [http://www.ebi.ac.uk/pdbsum/2mav PDBsum]</span></td></tr> | ||
| + | <table> | ||
| + | <div style="background-color:#fffaf0;"> | ||
| + | == Publication Abstract from PubMed == | ||
| + | 2-Amino-3-methylimidazo[4,5-f]quinolone (IQ), a heterocyclic amine found in cooked meats, undergoes bioactivation to a nitrenium ion, which alkylates guanines at both the C8-dG and N2-dG positions. The conformation of a site-specific N2-dG-IQ adduct in an oligodeoxynucleotide duplex containing the iterated CG repeat restriction site of the NarI endonuclease has been determined. The IQ moiety intercalates, with the IQ H4a and CH3 protons facing the minor groove, and the IQ H7a, H8a and H9a protons facing the major groove. The adducted dG maintains the anti-conformation about the glycosyl bond. The complementary dC is extruded into the major groove. The duplex maintains its thermal stability, which is attributed to stacking between the IQ moiety and the 5'- and 3'-neighboring base pairs. This conformation is compared to that of the C8-dG-IQ adduct in the same sequence, which also formed a 'base-displaced intercalated' conformation. However, the C8-dG-IQ adopted the syn conformation placing the Watson-Crick edge of the modified dG into the major groove. In addition, the C8-dG-IQ adduct was oriented with the IQ CH3 group and H4a and H5a facing the major groove. These differences may lead to differential processing during DNA repair and replication. | ||
| - | + | Base-displaced intercalation of the 2-amino-3-methylimidazo[4,5-f]quinolone N2-dG adduct in the NarI DNA recognition sequence.,Stavros KM, Hawkins EK, Rizzo CJ, Stone MP Nucleic Acids Res. 2014 Mar;42(5):3450-63. doi: 10.1093/nar/gkt1109. Epub 2013, Dec 23. PMID:24366876<ref>PMID:24366876</ref> | |
| - | + | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |
| - | + | </div> | |
| - | + | == References == | |
| + | <references/> | ||
| + | __TOC__ | ||
| + | </StructureSection> | ||
| + | [[Category: Hawkins, E K.]] | ||
| + | [[Category: Rizzo, C J.]] | ||
| + | [[Category: Stavros, K M.]] | ||
| + | [[Category: Stone, M P.]] | ||
| + | [[Category: Dna]] | ||
| + | [[Category: Dna adduct]] | ||
| + | [[Category: Heterocyclic amine]] | ||
| + | [[Category: N2-iq]] | ||
| + | [[Category: Nari]] | ||
| + | [[Category: Oligodeoxyribonucleotide]] | ||
| + | [[Category: Quinoline]] | ||
Revision as of 07:15, 14 May 2014
NMR Structure of N2-IQ-dG at the G3 position in the NarI recognition sequence
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