1sl1
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Binary 5' complex of T7 DNA polymerase with a DNA primer/template containing a cis-syn thymine dimer on the template
OverviewOverview
Ultraviolet-induced DNA damage poses a lethal block to replication. To, understand the structural basis for this, we determined crystal structures, of a replicative DNA polymerase from bacteriophage T7 in complex with, nucleotide substrates and a DNA template containing a cis-syn cyclobutane, pyrimidine dimer (CPD). When the 3' thymine is the templating base, the, CPD is rotated out of the polymerase active site and the fingers subdomain, adopts an open orientation. When the 5' thymine is the templating base, the CPD lies within the polymerase active site where it base-pairs with, the incoming nucleotide and the 3' base of the primer, while the fingers, are in a closed conformation. These structures reveal the basis for the, strong block of DNA replication that is caused by this photolesion.
About this StructureAbout this Structure
1SL1 is a Protein complex structure of sequences from Bacteriophage t7 and Escherichia coli with MG as ligand. Active as DNA-directed DNA polymerase, with EC number 2.7.7.7 Full crystallographic information is available from OCA.
ReferenceReference
Nucleotide insertion opposite a cis-syn thymine dimer by a replicative DNA polymerase from bacteriophage T7., Li Y, Dutta S, Doublie S, Bdour HM, Taylor JS, Ellenberger T, Nat Struct Mol Biol. 2004 Aug;11(8):784-90. Epub 2004 Jul 4. PMID:15235589
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