This entry represents the N-terminal domain of BREX system Lon protease-like protein BrxL from Bacillus cereus and similar proteins. BrxL is part of a type 1 BREX system, which contains a C-terminal Lon-like protease domain (Pfam:PF05362). BREX systems (bacteriophage exclusion) provide immunity against bacteriophage, a system that allows phage adsorption but prevents phage DNA replication, without degradation of the phage DNA [1].

1: BREX is a novel phage resistance system widespread in microbial genomes. Goldfarb T, Sberro H, Weinstock E, Cohen O, Doron S, Charpak-Amikam Y, Afik S, Ofir G, Sorek R; EMBO J. 2015;34:169-183. PMID:25452498