Structural Basis for Hydroxymethylcytosine Recognition by the SRA Domain of UHRF2

  • Ting Zhou
  • , Jun Xiong
  • , Mingzhu Wang
  • , Na Yang
  • , Jiemin Wong
  • , Bing Zhu
  • , Rui Ming Xu*
  • *Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

99 Scopus citations

Abstract

Methylated cytosine of CpG dinucleotides in vertebrates may be oxidized by Tet proteins, a process that can lead to DNA demethylation. The predominant oxidation product, 5-hydroxymethylcytosine (5hmC), has been implicated in embryogenesis, cell differentiation, and human diseases. Recently, the SRA domain of UHRF2 (UHRF2-SRA) has been reported to specifically recognize 5hmC, but how UHRF2 recognizes this modification is unclear. Here we report the structure of UHRF2-SRA in complex with a 5hmC-containing DNA. The structure reveals that the conformation of a phenylalanine allows the formation of an optimal 5hmC binding pocket, and a hydrogen bond between the hydroxyl group of 5hmC and UHRF2-SRA is critical for their preferential binding. Further structural and biochemical analyses unveiled the role of SRA domains as a versatile reader of modified DNA, and the knowledge should facilitate further understanding of the biological function of UHRF2 and the comprehension of DNA hydroxymethylation in general.

Original languageEnglish
Pages (from-to)879-886
Number of pages8
JournalMolecular Cell
Volume54
Issue number5
DOIs
StatePublished - 5 Jun 2014

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