This family consists of several CryBP1 like proteins from Bacillus thuringiensis and Paenibacillus popilliae. Members of this family are thought to be involved in the overall toxicity of the bacteria to their hosts [1,2].

1: Transcriptional regulation of the cryIVD gene operon from Bacillus thuringiensis subsp. israelensis. Dervyn E, Poncet S, Klier A, Rapoport G; J Bacteriol 1995;177:2283-2291. PMID:7730255

2: Cloning and analysis of the first cry gene from Bacillus popilliae. Zhang J, Hodgman TC, Krieger L, Schnetter W, Schairer HU; J Bacteriol 1997;179:4336-4341. PMID:9209052