This domain was originally found in the C-terminal moiety of the Cpl-7 lysozyme encoded by the Streptococcus pneumoniae bacteriophage Cp-7 (Swiss:P19385). It is also found in the cell wall hydrolases of human and life-stock pathogens. CW_7 repeats make up a cell wall binding motif [3][4].

1: Modular organization of the lytic enzymes of Streptococcus pneumoniae and its bacteriophages. Garcia P, Garcia JL, Garcia E, Sanchez-Puelles JM, Lopez R; Gene 1990;86:81-88. PMID:2311937

2: Recent trends on the molecular biology of pneumococcal capsules, lytic enzymes, and bacteriophage. Lopez R, Garcia E; FEMS Microbiol Rev 2004;28:553-580. PMID:15539074

3: Thermal stability of Cpl-7 endolysin from the streptococcus pneumoniae bacteriophage Cp-7; cell wall-targeting of its CW_7 motifs. Bustamante N, Rico-Lastres P, Garcia E, Garcia P, Menendez M; PLoS One. 2012;7:e46654. PMID:23056389

4: Cpl-7, a lysozyme encoded by a pneumococcal bacteriophage with a novel cell wall-binding motif. Bustamante N, Campillo NE, Garcia E, Gallego C, Pera B, Diakun GP, Saiz JL, Garcia P, Diaz JF, Menendez M; J Biol Chem. 2010;285:33184-33196. PMID:20720016