Modifies the set of genes regulated by H-NS; Hha and cnu (YdgT) increase the number of genes bound by H-NS/StpA and may also modulate the oligomerization of the H-NS/StpA-complex on DNA. The complex formed with H-NS binds to the specific 26-bp cnb site in the origin of replication oriC. Forms complexes with both H-NS and StpA. Belongs to the Hha/YmoA/Cnu family.