2hmd
From Proteopedia
| Line 1: | Line 1: | ||
| - | [[Image:2hmd.gif|left|200px]] | + | [[Image:2hmd.gif|left|200px]] |
| - | + | ||
| - | '''Stereochemistry Modulates Stability of Reduced Inter-Strand Cross-Links Arising From R- and S-alpha-methyl-gamma-OH-1,N2-propano-2'-Deoxyguanine in the 5'-CpG-3' DNA Sequence''' | + | {{Structure |
| + | |PDB= 2hmd |SIZE=350|CAPTION= <scene name='initialview01'>2hmd</scene> | ||
| + | |SITE= | ||
| + | |LIGAND= | ||
| + | |ACTIVITY= | ||
| + | |GENE= | ||
| + | }} | ||
| + | |||
| + | '''Stereochemistry Modulates Stability of Reduced Inter-Strand Cross-Links Arising From R- and S-alpha-methyl-gamma-OH-1,N2-propano-2'-Deoxyguanine in the 5'-CpG-3' DNA Sequence''' | ||
| + | |||
==Overview== | ==Overview== | ||
| Line 7: | Line 16: | ||
==About this Structure== | ==About this Structure== | ||
| - | 2HMD is a [ | + | 2HMD is a [[Protein complex]] structure of sequences from [http://en.wikipedia.org/wiki/ ]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2HMD OCA]. |
==Reference== | ==Reference== | ||
| - | 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:// | + | 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] |
[[Category: Protein complex]] | [[Category: Protein complex]] | ||
[[Category: Cho, Y J.]] | [[Category: Cho, Y J.]] | ||
| Line 19: | Line 28: | ||
[[Category: crotonaldehyde interstrand dna cross-link]] | [[Category: crotonaldehyde interstrand dna cross-link]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 17:18:50 2008'' |
Revision as of 15:18, 20 March 2008
| |||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
Stereochemistry Modulates Stability of Reduced Inter-Strand Cross-Links Arising From R- and S-alpha-methyl-gamma-OH-1,N2-propano-2'-Deoxyguanine in the 5'-CpG-3' DNA Sequence
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.
About this Structure
2HMD is a Protein complex structure of sequences from [1]. Full crystallographic information is available from OCA.
Reference
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
Page seeded by OCA on Thu Mar 20 17:18:50 2008
