Members of this family are predominantly found in prokaryotic restriction endonuclease PvuII. They recognise the double-stranded DNA sequence 5'-CAGCTG-3' and cleave after G-3, resulting in specific double-stranded fragments with terminal 5'-phosphates [1].

1: Asp34 of PvuII endonuclease is directly involved in DNA minor groove recognition and indirectly involved in catalysis. Horton JR, Nastri HG, Riggs PD, Cheng X; J Mol Biol. 1998;284:1491-1504. PMID:9878366

2: 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