Dam-replacing protein (DRP) is an restriction endonuclease that is flanked by pseudo-transposable small repeat elements. The replacement of Dam-methylase by DRP allows phase variation through slippage-like mechanisms in several pathogenic isolates of Neisseria meningitidis [1].

1: Evolution and function of the neisserial dam-replacing gene. Cantalupo G, Bucci C, Salvatore P, Pagliarulo C, Roberti V, Lavitola A, Bruni CB, Alifano P; FEBS Lett 2001;495:178-183. PMID:11334887

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