1mq3: Difference between revisions
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[[Image:1mq3.jpg|left|200px]] | [[Image:1mq3.jpg|left|200px]] | ||
'''Human DNA Polymerase Beta Complexed With Gapped DNA Containing an 8-oxo-7,8-dihydro-Guanine Template Paired with dCTP''' | {{Structure | ||
|PDB= 1mq3 |SIZE=350|CAPTION= <scene name='initialview01'>1mq3</scene>, resolution 2.8Å | |||
|SITE= | |||
|LIGAND= <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene> and <scene name='pdbligand=DCP:2'-DEOXYCYTIDINE-5'-TRIPHOSPHATE'>DCP</scene> | |||
|ACTIVITY= [http://en.wikipedia.org/wiki/DNA-directed_DNA_polymerase DNA-directed DNA polymerase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.7.7 2.7.7.7] | |||
|GENE= | |||
}} | |||
'''Human DNA Polymerase Beta Complexed With Gapped DNA Containing an 8-oxo-7,8-dihydro-Guanine Template Paired with dCTP''' | |||
==Overview== | ==Overview== | ||
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==About this Structure== | ==About this Structure== | ||
1MQ3 is a [ | 1MQ3 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1MQ3 OCA]. | ||
==Reference== | ==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:[http:// | 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:[http://www.ncbi.nlm.nih.gov/pubmed/12517346 12517346] | ||
[[Category: DNA-directed DNA polymerase]] | [[Category: DNA-directed DNA polymerase]] | ||
[[Category: Homo sapiens]] | [[Category: Homo sapiens]] | ||
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[[Category: transferase]] | [[Category: transferase]] | ||
''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 12:46:43 2008'' | ||
Revision as of 10:46, 20 March 2008
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| 1mq3, resolution 2.8Å | |||||||||||||
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| Ligands: | MG, NA and DCP | ||||||||||||
| Activity: | DNA-directed DNA polymerase, with EC number 2.7.7.7 | ||||||||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||||||||
Human DNA Polymerase Beta Complexed With Gapped DNA Containing an 8-oxo-7,8-dihydro-Guanine Template Paired with dCTP
Overview
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.
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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