Hachiman antiphage defense system has been described in Ralstonia solanacearum species complex (RSSC), and is composed of two genes, hamAB, which encode a protein of unknown function HamA, represented in this entry, and an helicase (HamB). Only one strain (KACC10722) from phylotype IV shows this system complete and both genes are organised in an operon [1,2].

1: Systematic discovery of antiphage defense systems in the microbial pangenome. Doron S, Melamed S, Ofir G, Leavitt A, Lopatina A, Keren M, Amitai G, Sorek R; Science. 2018; [Epub ahead of print] PMID:29371424

2: Diversity and Evolutionary Dynamics of Antiphage Defense Systems in Ralstonia solanacearum Species Complex. Castillo JA, Secaira-Morocho H, Maldonado S, Sarmiento KN; Front Microbiol. 2020;11:961. PMID:32508782