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Structure of a Trapped Endonuclease III-DNA Covalent Intermediate: Estranged-Adenine Complex
OverviewOverview
Nearly all cells express proteins that confer resistance to the mutagenic effects of oxidative DNA damage. The primary defense against the toxicity of oxidative nucleobase lesions in DNA is the base-excision repair (BER) pathway. Endonuclease III (EndoIII) is a [4Fe-4S] cluster-containing DNA glycosylase with repair activity specific for oxidized pyrimidine lesions in duplex DNA. We have determined the crystal structure of a trapped intermediate that represents EndoIII frozen in the act of repairing DNA. The structure of the protein-DNA complex provides insight into the ability of EndoIII to recognize and repair a diverse array of oxidatively damaged bases. This structure also suggests a rationale for the frequent occurrence in certain human cancers of a specific mutation in the related DNA repair protein MYH.
About this StructureAbout this Structure
Full crystallographic information is available from OCA.
ReferenceReference
Structure of a trapped endonuclease III-DNA covalent intermediate., Fromme JC, Verdine GL, EMBO J. 2003 Jul 1;22(13):3461-71. PMID:12840008 Page seeded by OCA on Sat May 3 04:12:04 2008