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- W2170964279 abstract "The discovery of 5-hydroxymethyl-cytosine (5hmC) in mammalian cells prompted us to look for this base in the DNA of Arabidopsis thaliana (thale cress), and to ask how well the Arabidopsis Variant in Methylation 1 (VIM1) protein, an essential factor in maintaining 5-cytosine methylation (5mC) homeostasis and epigenetic silencing in this plant, recognizes this novel base. We found that the DNA of Arabidopsis’ leaves and flowers contain low levels of 5hmC. We also cloned and expressed in Escherichia coli full-length VIM1 protein, the archetypal member of the five Arabidopsis VIM gene family. Using in vitro binding assays, we observed that full-length VIM1 binds preferentially to hemi-methylated DNA with a single modified 5mCpG site; this result is consistent with its known role in preserving DNA methylation in vivo following DNA replication. However, when 5hmC replaces one or both cytosine residues at a palindromic CpG site, VIM1 binds with approximately ⩾10-fold lower affinity. These results suggest that 5hmC may contribute to VIM-mediated passive loss of cytosine methylation in vivo during Arabidopsis DNA replication." @default.
- W2170964279 created "2016-06-24" @default.
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- W2170964279 date "2012-05-01" @default.
- W2170964279 modified "2023-10-17" @default.
- W2170964279 title "Heterologous expression and purification of Arabidopsis thaliana VIM1 protein: In vitro evidence for its inability to recognize hydroxymethylcytosine, a rare base in Arabidopsis DNA" @default.
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- W2170964279 doi "https://doi.org/10.1016/j.pep.2012.03.003" @default.
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