ArticlebioRxiv : the preprint server for biology2024
Thymine DNA glycosylase combines sliding, hopping, and nucleosome interactions to efficiently search for 5-formylcytosine.
Article in bioRxiv : the preprint server for biology, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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8 authors at 4 institutions in 1 country.
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Abstract
Base excision repair is the main pathway involved in active DNA demethylation. 5-formylctyosine and 5-carboxylcytosine, two oxidized moieties of methylated cytosine, are recognized and removed by thymine DNA glycosylase (TDG) to generate an abasic site. Using single molecule fluorescence experiments, we studied TDG in the presence and absence of 5-formylctyosine. TDG exhibits multiple modes of linear diffusion, including hopping and sliding, in search of a lesion. We probed TDG active site variants and truncated N-terminus revealing how these variants alter the lesion search and recognition mechanism of TDG. On DNA containing an undamaged nucleosome, TDG was found to either bypass, colocalize with, or encounter but not bypass the nucleosome. However, truncating the N-terminus reduced the number of interactions with the nucleosome. Our findings provide unprecedented mechanistic insights into how TDG searches for DNA lesions in chromatin.
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