To define the role of SoxS in the regulation of ompW expression , we constructed transcriptional-fusions .
SoxS binds to the regulatory region of the ompW gene The transcriptional-fusions showed that SoxS is a genetic element .
Binding of purified SoxS to the ompW promoter strongly suggests that the PQ-and SoxS-mediated activation of ompW is the result of a direct interaction between the promoter and SoxS .
SoxS regulates the expression of the S. Typhimurium ompW gene .