Overall structure of PvuRts1I. (a) Ribbon representation of PvuRts1I. The endonuclease domain and SRA-like domain are coloured cyan and green, respectively. (b) Schematic drawing of the topology of PvuRts1I. (c) Ribbon representation of the N-terminal endonuclease domain of PvuRts1I. (d) Ribbon representation of the C-terminal SRA-like domain of PvuRts1I.