This family of endonucleases includes a group I intron-encoded endonuclease [1]. This family belongs to the PD-(D/E)XK superfamily [2-3].

1: A novel group I intron-encoded endonuclease specific for the anticodon region of tRNA(fMet) genes. Bonocora RP, Shub DA; Mol Microbiol. 2001;39:1299-1306. PMID:11251845

2: The restriction fold turns to the dark side: a bacterial homing endonuclease with a PD-(D/E)-XK motif. Zhao L, Bonocora RP, Shub DA, Stoddard BL; EMBO J. 2007;26:2432-2442. PMID:17410205

3: Sequence, structure and functional diversity of PD-(D/E)XK phosphodiesterase superfamily. Steczkiewicz K, Muszewska A, Knizewski L, Rychlewski L, Ginalski K; Nucleic Acids Res. 2012;40:7016-7045. PMID:22638584