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 (PubMed:23543115). The complex formed with H-NS binds to the specific 26-bp cnb site in the origin of replication oriC (PubMed:16199570). Can complement, at least partially, the absence of the Hha protein in hha mutants. Forms complexes with both H-NS and StpA. At 0.3 M NaCl up-regulation of 1 gene and down-regulation of 6 genes was observed; a double cnu-hha deletion up-regulated 134 and down-regulated 5 genes, most of which are thought to have been acquired horizontally and are also up-regulated in double hns-stpA deletions (PubMed:23543115). Expression becomes maximal as cells enter the stationary phase but decreases later in the stationary phase. Belongs to the Hha/YmoA/Cnu family.