This family includes enzymes that ADP-ribosylations, for example ADP-ribosylarginine hydrolase EC:3.2.2.19 cleaves ADP-ribose-L-arginine [1]. The family also includes dinitrogenase reductase activating glycohydrolase [2]. Most surprisingly the family also includes jellyfish crystallins [2], these proteins appear to have lost the presumed active site residues.

1: Cloning and site-directed mutagenesis of human ADP-ribosylarginine hydrolase. Takada T, Iida K, Moss J; J Biol Chem 1993;268:17837-17843. PMID:8349667

2: Genes coding for the reversible ADP-ribosylation system of dinitrogenase reductase from Rhodospirillum rubrum. Fitzmaurice WP, Saari LL, Lowery RG, Ludden PW, Roberts GP; Mol Gen Genet 1989;218:340-347. PMID:2506427

3: J1-crystallins of the cubomedusan jellyfish lens constitute a novel family encoded in at least three intronless genes. Piatigorsky J, Horwitz J, Norman BL; J Biol Chem 1993;268:11894-11901. PMID:8505315