This entry represents the ATPase domain found in 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]. Methylation of bacterial DNA by PglX probably guides self/non-self discrimination. This entry also includes a few uncharacterised viral sequences.

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