1vtd: Difference between revisions
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<StructureSection load='1vtd' size='340' side='right'caption='[[1vtd]], [[Resolution|resolution]] 2.80Å' scene=''> | <StructureSection load='1vtd' size='340' side='right'caption='[[1vtd]], [[Resolution|resolution]] 2.80Å' scene=''> | ||
== Structural highlights == | == Structural highlights == | ||
<table><tr><td colspan='2'>[[1vtd]] is a 2 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1VTD OCA]. For a <b>guided tour on the structure components</b> use [ | <table><tr><td colspan='2'>[[1vtd]] is a 2 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1VTD OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1VTD FirstGlance]. <br> | ||
</td></tr><tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[ | </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=1vtd FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1vtd OCA], [https://pdbe.org/1vtd PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1vtd RCSB], [https://www.ebi.ac.uk/pdbsum/1vtd PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1vtd ProSAT]</span></td></tr> | ||
</table> | </table> | ||
<div style="background-color:#fffaf0;"> | <div style="background-color:#fffaf0;"> | ||
Revision as of 15:10, 27 April 2022
UNUSUAL HELICAL PACKING IN CRYSTALS OF DNA BEARING A MUTATION HOT SPOTUNUSUAL HELICAL PACKING IN CRYSTALS OF DNA BEARING A MUTATION HOT SPOT
Structural highlights
Publication Abstract from PubMedThe target sequence of the restriction enzyme NarI (GGCGCC) is a hot spot for the -2 frameshift mutagenesis (GGCGCC----GGCC) induced by the chemical carcinogens such as N-2-acetyl-aminofluorene. Of the guanine residues, all of which show equal reactivity towards the carcinogen, only binding to the 3'-most proximal guanine within the NarI site is able to trigger the frameshift event. We selected the non-palindromic dodecamer d(ACCGGCGCCACA), whose sequence corresponds to the most mutagenic NarI site in pBR322 DNA; for X-ray structure analysis. Its molecular structure determined at 2.8 A resolution reveals significant deviations from the structure of canonical B-form DNA, with partial opening of three G-C base pairs, high propeller twist values and sequence-dependent three-centred hydrogen bonds. This crystal structure shows a novel kind of packing in which helices are locked together by groove-backbone interactions. The partial opening of G-C base pairs is induced by interactions of phosphate anionic oxygen atoms with the amino group of cytosine bases. This provides a model for close approach of DNA molecules during biological processes, such as recombination. Unusual helical packing in crystals of DNA bearing a mutation hot spot.,Timsit Y, Westhof E, Fuchs RP, Moras D Nature. 1989 Oct 5;341(6241):459-62. doi: 10.1038/341459a0. PMID:2797169[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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