sroB is found in several Enterobacterial species but its function is unknown.

[1][2] SroB is found in the intergenic region on the opposite strand to the ybaK and ybaP genes.

[1] Experiments have shown that SroB is a Hfq binding sRNA.

[2][3] Further evidence has shown that SroB negatively regulates the outer membrane protein YbfM by sequestering the ribosome binding site of ybfM mRNA by an antisense interaction.

[5] Furthermore, SroB itself appears to be the target of a non-coding transcript from the chbBC intergenic region.