3CW7

Crystal Structure of an AlkA Host/Guest Complex 8oxoGuanine:Cytosine Base Pair

Summary for 3CW7

• Entry DOI: 10.2210/pdb3cw7/pdb
• Related: 3CVS 3CVT 3CWA 3CWS 3CWT 3CWU
• Descriptor: DNA-3-methyladenine glycosylase 2, DNA (5'-D(*DGP*DAP*DCP*DAP*DTP*DGP*DAP*(8OG)P*DTP*DGP*DCP*DC)-3'), DNA (5'-D(*DGP*DGP*DCP*DAP*DCP*DTP*DCP*DAP*DTP*DGP*DTP*DC)-3'), ... (4 entities in total)
• Functional Keywords: alka, 8oxoguanine, dna repair, host-guest complex, dna structure, dna damage, hydrolase, hydrolase-dna complex, hydrolase/dna
• Biological source: Escherichia coli (strain K12)
• Total number of polymer chains: 8
• Total formula weight: 140384.54

Authors

Bowman, B.R.,Lee, S.,Wang, S.,Verdine, G.L. (deposition date: 2008-04-21, release date: 2008-09-02, Last modification date: 2024-02-21)

Primary citation

Bowman, B.R.,Lee, S.,Wang, S.,Verdine, G.L.
Structure of the E. coli DNA Glycosylase AlkA Bound to the Ends of Duplex DNA: A System for the Structure Determination of Lesion-Containing DNA.
Structure, 16:1166-1174, 2008

PubMed Abstract: The constant attack on DNA by endogenous and exogenous agents gives rise to nucleobase modifications that cause mutations, which can lead to cancer. Visualizing the effects of these lesions on the structure of duplex DNA is key to understanding their biologic consequences. The most definitive method of obtaining such structures, X-ray crystallography, is troublesome to employ owing to the difficulty of obtaining diffraction-quality crystals of DNA. Here, we present a crystallization system that uses a protein, the DNA glycosylase AlkA, as a scaffold to mediate the crystallization of lesion-containing duplex DNA. We demonstrate the use of this system to facilitate the rapid structure determination of DNA containing the lesion 8-oxoguanine in several different sequence contexts, and also deoxyinosine and 1,N(6)-ethenoadenine, each stabilized as the corresponding 2'-flouro analog. The structures of 8-oxoguanine provide a correct atomic-level view of this important endogenous lesion in DNA.

PubMed: 18682218
DOI: 10.1016/j.str.2008.04.012

Experimental method

X-RAY DIFFRACTION (2.3 Å)