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2oks

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[[Image:2oks.gif|left|200px]]
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{{STRUCTURE_2oks| PDB=2oks | SCENE= }}
{{STRUCTURE_2oks| PDB=2oks | SCENE= }}
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'''X-ray Structure of a DNA Repair Substrate Containing an Alkyl Interstrand Crosslink at 1.65 Resolution'''
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===X-ray Structure of a DNA Repair Substrate Containing an Alkyl Interstrand Crosslink at 1.65 Resolution===
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==Overview==
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Chemotherapeutic alkylating agents, such as bifunctional nitrogen mustards and cisplatins, generate interstrand DNA cross-links that inhibit cell proliferation by arresting DNA transcription and replication. A synthetic N4C-ethyl-N4C interstrand cross-link between opposing cytidines mimics the DNA damage produced by this class of clinically important compounds and can be synthesized in large quantities to study the repair, physical properties, and structures of these DNA adducts. The X-ray structure of a DNA duplex d(CCAAC*GTTGG)2 containing a synthetic N4C-ethyl-N4C interstrand cross-link between the cytosines of the central CpG step (*) has been determined at 1.65 A resolution. This structure reveals that the ethyl cross-link in the CpG major groove does not significantly disrupt the B-form DNA helix. Comparison of the N4C-ethyl-N4C cross-linked structure with the structure of an un-cross-linked oligonucleotide of the same sequence reveals that the cross-link selectively stabilizes a preexisting alternative conformation. The conformation preferred by the cross-linked DNA is constrained by the geometry of the ethyl group bridging the cytosine amines. Characteristics of the cross-linked CpG step include subtle differences in the roll of the base pairs, optimized Watson-Crick hydrogen bonds, and loss of a divalent cation binding site. Given that the N4C-ethyl-N4C cross-link stabilizes a preexisting conformation of the CpG step, this synthetically accessible substrate presents an ideal model system for studying the genomic effects of covalently coupling the DNA strands, independent of gross alterations in DNA structure.
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(as it appears on PubMed at http://www.pubmed.gov), where 17375936 is the PubMed ID number.
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{{ABSTRACT_PUBMED_17375936}}
==About this Structure==
==About this Structure==
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[[Category: Dna damage]]
[[Category: Dna damage]]
[[Category: Interstrand crosslink]]
[[Category: Interstrand crosslink]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 11:06:55 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 05:59:32 2008''

Revision as of 02:59, 28 July 2008

Image:2oks.png

Template:STRUCTURE 2oks

X-ray Structure of a DNA Repair Substrate Containing an Alkyl Interstrand Crosslink at 1.65 Resolution

Template:ABSTRACT PUBMED 17375936

About this Structure

Full crystallographic information is available from OCA.

Reference

Structure of a DNA repair substrate containing an alkyl interstrand cross-link at 1.65 A resolution., Swenson MC, Paranawithana SR, Miller PS, Kielkopf CL, Biochemistry. 2007 Apr 17;46(15):4545-53. Epub 2007 Mar 22. PMID:17375936

Page seeded by OCA on Mon Jul 28 05:59:32 2008

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