This entry represents the winged helix domain of ribosomal oxygenases, including ROXA from E.coli, which is reminiscent of WH-domains involved in protein-protein and protein-nucleic acid interactions. However, this domain has an overall negative charge suggesting they do not directly bind nucleic acids [1].

1: Ribosomal oxygenases are structurally conserved from prokaryotes to humans. Chowdhury R, Sekirnik R, Brissett NC, Krojer T, Ho CH, Ng SS, Clifton IJ, Ge W, Kershaw NJ, Fox GC, Muniz JRC, Vollmar M, Phillips C, Pilka ES, Kavanagh KL, von Delft F, Oppermann U, McDonough MA, Doherty AJ, Schofield CJ; Nature. 2014;510:422-426. PMID:24814345