The versatile thymine DNA-glycosylase: a comparative characterization of the human, Drosophila and fission yeast orthologs.

Abstract:

:Human thymine-DNA glycosylase (TDG) is well known to excise thymine and uracil from G.T and G.U mismatches, respectively, and was therefore proposed to play a central role in the cellular defense against genetic mutation through spontaneous deamination of 5-methylcytosine and cytosine. In this study, we characterized two newly discovered orthologs of TDG, the Drosophila melanogaster Thd1p and the Schizosaccharomyces pombe Thp1p proteins, with an objective to address the function of this subfamily of uracil-DNA glycosylases from an evolutionary perspective. A systematic biochemical comparison of both enzymes with human TDG revealed a number of biologically significant facts. (i) All eukaryotic TDG orthologs have broad and species-specific substrate spectra that include a variety of damaged pyrimidine and purine bases; (ii) the common most efficiently processed substrates of all are uracil and 3,N4- ethenocytosine opposite guanine and 5-fluorouracil in any double-stranded DNA context; (iii) 5-methylcytosine and thymine derivatives are processed with an appreciable efficiency only by the human and the Drosophila enzymes; (iv) none of the proteins is able to hydrolyze a non-damaged 5'-methylcytosine opposite G; and (v) the double strand and mismatch dependency of the enzymes varies with the substrate and is not a stringent feature of this subfamily of DNA glycosylases. These findings advance our current view on the role of TDG proteins and document that they have evolved with high structural flexibility to counter a broad range of DNA base damage in accordance with the specific needs of individual species.

journal_name

Nucleic Acids Res

journal_title

Nucleic acids research

authors

Hardeland U,Bentele M,Jiricny J,Schär P

doi

10.1093/nar/gkg344

keywords:

subject

Has Abstract

pub_date

2003-05-01 00:00:00

pages

2261-71

issue

9

eissn

0305-1048

issn

1362-4962

journal_volume

31

pub_type

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