1mq3: Difference between revisions

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[[Image:1mq3.jpg|left|200px]]
{{Seed}}
[[Image:1mq3.png|left|200px]]


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{{STRUCTURE_1mq3|  PDB=1mq3  |  SCENE=  }}  
{{STRUCTURE_1mq3|  PDB=1mq3  |  SCENE=  }}  


'''Human DNA Polymerase Beta Complexed With Gapped DNA Containing an 8-oxo-7,8-dihydro-Guanine Template Paired with dCTP'''
===Human DNA Polymerase Beta Complexed With Gapped DNA Containing an 8-oxo-7,8-dihydro-Guanine Template Paired with dCTP===




==Overview==
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Oxidative damage to DNA generates 8-oxo-7,8-dihydro-2'-deoxyguanosine (8-oxodG). During DNA replication and repair synthesis, 8-oxodG can pair with cytosine or adenine. The ability to accurately replicate through this lesion depends on the DNA polymerase. We report the first structure of a polymerase with a promutagenic DNA lesion, 8-oxodG, in the confines of its active site. The modified guanine residue is in an anti conformation and forms Watson-Crick hydrogen bonds with an incoming dCTP. To accommodate the oxygen at C8, the 5'-phosphate backbone of the templating nucleotide flips 180 degrees. Thus, the flexibility of the template sugar-phosphate backbone near the polymerase active site is one parameter that influences the anti-syn equilibrium of 8-oxodG. Our results provide insights into the mechanisms employed by polymerases to select the complementary dNTP.
The line below this paragraph, {{ABSTRACT_PUBMED_12517346}}, adds the Publication Abstract to the page
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{{ABSTRACT_PUBMED_12517346}}


==About this Structure==
==About this Structure==
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[[Category: Dna]]
[[Category: Dna]]
[[Category: Transferase]]
[[Category: Transferase]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 01:35:00 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Jul 3 00:50:16 2008''

Revision as of 21:50, 2 July 2008

File:1mq3.png

Template:STRUCTURE 1mq3

Human DNA Polymerase Beta Complexed With Gapped DNA Containing an 8-oxo-7,8-dihydro-Guanine Template Paired with dCTP

Template:ABSTRACT PUBMED 12517346

About this Structure

1MQ3 is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

Reference

Structure of DNA polymerase beta with the mutagenic DNA lesion 8-oxodeoxyguanine reveals structural insights into its coding potential., Krahn JM, Beard WA, Miller H, Grollman AP, Wilson SH, Structure. 2003 Jan;11(1):121-7. PMID:12517346

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