Binds to H-NS and modified the range of genes it silences; H-NS alonge silences core gene while the H-NS-Hha complex (and presumably also H-NS-YdgT) silences genes acquired by horizontal gene transfer. Plays a role silencing virulence factors in the absence of factors that induce pathogenicity (By similarity). The complex formed with H-NS binds to the specific 26-bp cnb site in the origin of replication oriC (By similarity). Forms complexes with both H-NS and StpA. Belongs to the Hha/YmoA/Cnu family.