1vtd: Difference between revisions
No edit summary |
No edit summary |
||
| (7 intermediate revisions by the same user not shown) | |||
| Line 1: | Line 1: | ||
< | ==UNUSUAL HELICAL PACKING IN CRYSTALS OF DNA BEARING A MUTATION HOT SPOT== | ||
<StructureSection load='1vtd' size='340' side='right'caption='[[1vtd]], [[Resolution|resolution]] 2.80Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[1vtd]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Synthetic_construct Synthetic construct]. 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='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.8Å</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> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
The 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<ref>PMID:2797169</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 1vtd" style="background-color:#fffaf0;"></div> | |||
== References == | |||
[[Category: | <references/> | ||
[[Category: | __TOC__ | ||
[[Category: | </StructureSection> | ||
[[Category: | [[Category: Large Structures]] | ||
[[Category: | [[Category: Synthetic construct]] | ||
[[Category: | [[Category: Fuchs RPP]] | ||
[[Category: Moras D]] | |||
[[Category: Timsit Y]] | |||
[[Category: Westhof E]] | |||
Latest revision as of 03:05, 28 December 2023
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
|
| ||||||||||||||||