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| {{STRUCTURE_1t4i| PDB=1t4i | SCENE= }} | | {{STRUCTURE_1t4i| PDB=1t4i | SCENE= }} |
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| '''Crystal Structure of a DNA Decamer Containing a Thymine-dimer'''
| | ===Crystal Structure of a DNA Decamer Containing a Thymine-dimer=== |
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| ==Overview==
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| It is well known that exposure to UV induces DNA damage, which is the first step in mutagenesis and a major cause of skin cancer. Among a variety of photoproducts, cyclobutane-type pyrimidine photodimers (CPD) are the most abundant primary lesion. Despite its biological importance, the precise relationship between the structure and properties of DNA containing CPD has remained to be elucidated. Here, we report the free (unbound) crystal structure of duplex DNA containing a CPD lesion at a resolution of 2.0 A. Our crystal structure shows that the overall helical axis bends approximately 30 degrees toward the major groove and unwinds approximately 9 degrees, in remarkable agreement with some previous theoretical and experimental studies. There are also significant differences in local structure compared with standard B-DNA, including pinching of the minor groove at the 3' side of the CPD lesion, a severe change of the base pair parameter in the 5' side, and serious widening of both minor and major groves both 3' and 5' of the CPD. Overall, the structure of the damaged DNA differs from undamaged DNA to an extent that DNA repair proteins may recognize this conformation, and the various components of the replicational and transcriptional machinery may be interfered with due to the perturbed local and global structure.
| | The line below this paragraph, {{ABSTRACT_PUBMED_12456887}}, adds the Publication Abstract to the page |
| | (as it appears on PubMed at http://www.pubmed.gov), where 12456887 is the PubMed ID number. |
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| | {{ABSTRACT_PUBMED_12456887}} |
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| ==About this Structure== | | ==About this Structure== |
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| [[Category: Thymine dimer]] | | [[Category: Thymine dimer]] |
| [[Category: Uv-damaged dna]] | | [[Category: Uv-damaged dna]] |
| ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 09:30:59 2008'' | | |
| | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 02:46:09 2008'' |
