The VirB System Plays a Crucial Role in Intracellular Infection.

Brucellosis is a highly prevalent zoonotic disease caused by . spp. are gram-negative facultative intracellular parasitic bacteria. Its intracellular survival and replication depend on a functional virB system, an operon encoded by VirB1-VirB12. Type IV secretion system (T4SS) encoded by the virB operon is an important virulence factor of . It can subvert cellular pathway and induce host immune response by secreting effectors, which promotes replication in host cells and induce persistent infection. Therefore, this paper summarizes the function and significance of the VirB system, focusing on the structure of the VirB system where VirB T4SS mediates biogenesis of the endoplasmic reticulum (ER)-derived replicative containing vacuole (rBCV), the effectors of T4SS and the cellular pathways it subverts, which will help better understand the pathogenic mechanism of and provide new ideas for clinical vaccine research and development.