This domain is found within the sporulation regulator WhiA. It is a LAGLIDADG superfamily like domain [1-2].

1: Bacterial DUF199/COG1481 Proteins Including Sporulation Regulator WhiA are Distant Homologs of LAGLIDADG Homing Endonucleases That Retained Only DNA Binding. Knizewski L, Ginalski K; Cell Cycle. 2007;6:1666-1670. PMID:17603302

2: The structure of a bacterial DUF199/WhiA protein: domestication of an invasive endonuclease. Kaiser BK, Clifton MC, Shen BW, Stoddard BL; Structure. 2009;17:1368-1376. PMID:19836336