5-Formylcytosine alters the structure of the DNA double helix.

5-Formylcytosine alters the structure of the DNA double helix.
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DOI:
10.1038/nsmb.2936
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发表时间:
2015-01
影响因子:
16.8
通讯作者:
Balasubramanian, Shankar
Balasubramanian, Shankar
中科院分区:
生物学1区
文献类型:
--
作者:
Raiber, Eun-Ang;Murat, Pierre;Chirgadze, Dimitri Y.;Beraldi, Dario;Luisi, Ben F.;Balasubramanian, Shankar

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The modified base 5-formylcytosine (5fC) was recently identified in mammalian DNA and might be considered as the “seventh” base of the genome. This nucleotide has been implicated in active demethylation mediated by the base excision repair enzyme thymine DNA glycosylase (TDG). Genomics and proteomics studies have suggested a further role for 5fC in transcription regulation through chromatin remodeling. Herein we propose how 5fC might signal these processes through its effect on DNA conformation. Biophysical and structural analysis revealed that 5fC alters the structure of the DNA double helix leading to a conformation unique amongst known DNA structures including those comprising other cytosine modifications. The 1.4 Å resolution X-ray crystal structure of a DNA dodecamer comprising three 5fCpG sites shown how 5fC changes the geometry of the grooves and base pairs associated with the modified base, which lead to helical under-winding.
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