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[[Image:2hmr.gif|left|200px]]


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==Solution structure of reduced interstrand cross-link arising from S-alpha-methyl-gamma-OH-1,N2-propano-2'-deoxyguanosine in the 5'-CpG-3' DNA sequence==
The line below this paragraph, containing "STRUCTURE_2hmr", creates the "Structure Box" on the page.
<StructureSection load='2hmr' size='340' side='right'caption='[[2hmr]]' scene=''>
You may change the PDB parameter (which sets the PDB file loaded into the applet)
== Structural highlights ==
or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
<table><tr><td colspan='2'>[[2hmr]] is a 2 chain structure. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2HMR OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2HMR FirstGlance]. <br>
or leave the SCENE parameter empty for the default display.
</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=2EG:2-DEOXY-N-ETHYLGUANOSINE+5-PHOSPHATE'>2EG</scene></td></tr>
{{STRUCTURE_2hmr|  PDB=2hmr  |  SCENE= }}
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=2hmr FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2hmr OCA], [https://pdbe.org/2hmr PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2hmr RCSB], [https://www.ebi.ac.uk/pdbsum/2hmr PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2hmr ProSAT]</span></td></tr>
 
</table>
'''Solution structure of reduced interstrand cross-link arising from S-alpha-methyl-gamma-OH-1,N2-propano-2'-deoxyguanosine in the 5'-CpG-3' DNA sequence'''
<div style="background-color:#fffaf0;">
 
== Publication Abstract from PubMed ==
 
==Overview==
The solution structures of 5'-Cp-N2-dG-3'-R-(alpha)-CH3-propyl-5'-Cp-N2-dG-3' and 5'-Cp-N2-dG-3'-S-(alpha)-CH3-propyl-5'-Cp-N2-dG-3' interstrand DNA cross-links in the 5'-CpG-3' sequence were determined by NMR spectroscopy. These were utilized as chemically stable surrogates for the corresponding carbinolamine interstrand cross-links arising from the crotonaldehyde- and acetaldehyde-derived R- and S-alpha-CH3-gamma-OH-1,N2-propanodeoxyguanosine adducts. The results provide an explanation for the observation that interstrand cross-link formation in the 5'-CpG-3' sequence by the R- and S-alpha-CH3-gamma-OH-1,N2-propanodeoxyguanosine adducts is dependent upon stereochemistry, favoring the R-alpha-CH3-gamma-OH-1,N2-propanodeoxyguanosine adduct [Kozekov, I. D., Nechev, L. V., Moseley, M. S., Harris, C. M., Rizzo, C. J., Stone, M. P., and Harris, T. M. (2003) J. Am. Chem. Soc. 125, 50-61]. Molecular dynamics calculations, restrained by NOE-based distances and empirical restraints, revealed that both the 5'-Cp-N2-dG-3'-R-(alpha)-CH3-propyl-5'-Cp-N2-dG-3' and 5'-Cp-N2-dG-3'-S-(alpha)-CH3-propyl-5'-Cp-N2-dG-3' cross-links were located in the minor groove and retained Watson-Crick hydrogen bonds at the tandem cross-linked C.G base pairs. However, for the 5'-Cp-N2-dG-3'-R-(alpha)-CH3-propyl-5'-Cp-N2-dG-3' cross-link, the (alpha)-CH3 group was positioned in the center of the minor groove, whereas for the 5'-Cp-N2-dG-3'-S-(alpha)-CH3-propyl-5'-Cp-N2-dG-3' cross-link, the (alpha)-CH3 group was positioned in the 3' direction, showing steric interference with the DNA helix. The 5'-Cp-N2-dG-3'-S-(alpha)-CH3-propyl-5'-Cp-N2-dG-3' cross-link exhibited a lower thermal stability as evidenced by NMR spectroscopy as a function of temperature. The two cross-links also exhibited apparent differences in the conformation of the interstrand three-carbon cross-link, which may also contribute to the lower apparent thermodynamic stability of the 5'-Cp-N2-dG-3'-S-(alpha)-CH3-propyl-5'-Cp-N2-dG-3' cross-link.
The solution structures of 5'-Cp-N2-dG-3'-R-(alpha)-CH3-propyl-5'-Cp-N2-dG-3' and 5'-Cp-N2-dG-3'-S-(alpha)-CH3-propyl-5'-Cp-N2-dG-3' interstrand DNA cross-links in the 5'-CpG-3' sequence were determined by NMR spectroscopy. These were utilized as chemically stable surrogates for the corresponding carbinolamine interstrand cross-links arising from the crotonaldehyde- and acetaldehyde-derived R- and S-alpha-CH3-gamma-OH-1,N2-propanodeoxyguanosine adducts. The results provide an explanation for the observation that interstrand cross-link formation in the 5'-CpG-3' sequence by the R- and S-alpha-CH3-gamma-OH-1,N2-propanodeoxyguanosine adducts is dependent upon stereochemistry, favoring the R-alpha-CH3-gamma-OH-1,N2-propanodeoxyguanosine adduct [Kozekov, I. D., Nechev, L. V., Moseley, M. S., Harris, C. M., Rizzo, C. J., Stone, M. P., and Harris, T. M. (2003) J. Am. Chem. Soc. 125, 50-61]. Molecular dynamics calculations, restrained by NOE-based distances and empirical restraints, revealed that both the 5'-Cp-N2-dG-3'-R-(alpha)-CH3-propyl-5'-Cp-N2-dG-3' and 5'-Cp-N2-dG-3'-S-(alpha)-CH3-propyl-5'-Cp-N2-dG-3' cross-links were located in the minor groove and retained Watson-Crick hydrogen bonds at the tandem cross-linked C.G base pairs. However, for the 5'-Cp-N2-dG-3'-R-(alpha)-CH3-propyl-5'-Cp-N2-dG-3' cross-link, the (alpha)-CH3 group was positioned in the center of the minor groove, whereas for the 5'-Cp-N2-dG-3'-S-(alpha)-CH3-propyl-5'-Cp-N2-dG-3' cross-link, the (alpha)-CH3 group was positioned in the 3' direction, showing steric interference with the DNA helix. The 5'-Cp-N2-dG-3'-S-(alpha)-CH3-propyl-5'-Cp-N2-dG-3' cross-link exhibited a lower thermal stability as evidenced by NMR spectroscopy as a function of temperature. The two cross-links also exhibited apparent differences in the conformation of the interstrand three-carbon cross-link, which may also contribute to the lower apparent thermodynamic stability of the 5'-Cp-N2-dG-3'-S-(alpha)-CH3-propyl-5'-Cp-N2-dG-3' cross-link.


==About this Structure==
Stereochemistry modulates the stability of reduced interstrand cross-links arising from R- and S-alpha-CH3-gamma-OH-1,N2-propano-2'-deoxyguanosine in the 5'-CpG-3' DNA sequence.,Cho YJ, Kozekov ID, Harris TM, Rizzo CJ, Stone MP Biochemistry. 2007 Mar 13;46(10):2608-21. Epub 2007 Feb 17. PMID:17305317<ref>PMID:17305317</ref>
Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2HMR OCA].


==Reference==
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
Stereochemistry modulates the stability of reduced interstrand cross-links arising from R- and S-alpha-CH3-gamma-OH-1,N2-propano-2'-deoxyguanosine in the 5'-CpG-3' DNA sequence., Cho YJ, Kozekov ID, Harris TM, Rizzo CJ, Stone MP, Biochemistry. 2007 Mar 13;46(10):2608-21. Epub 2007 Feb 17. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/17305317 17305317]
</div>
[[Category: Cho, Y J.]]
<div class="pdbe-citations 2hmr" style="background-color:#fffaf0;"></div>
[[Category: Harris, T M.]]
== References ==
[[Category: Kozekov, I D.]]
<references/>
[[Category: Rizzo, C J.]]
__TOC__
[[Category: Stone, M P.]]
</StructureSection>
[[Category: Crotonaldehyde interstrand dna cross-link]]
[[Category: Large Structures]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May  4 06:28:12 2008''
[[Category: Cho Y-J]]
[[Category: Harris TM]]
[[Category: Kozekov ID]]
[[Category: Rizzo CJ]]
[[Category: Stone MP]]

Latest revision as of 16:37, 13 December 2023

Solution structure of reduced interstrand cross-link arising from S-alpha-methyl-gamma-OH-1,N2-propano-2'-deoxyguanosine in the 5'-CpG-3' DNA sequence

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