While csgD is positively regulated by RpoS via MlrA , it itself stimulates the production of curli fimbriae through the transcriptional activation of the csgBAC operon .
In addition , the possibility that ArcZ is required for RpoS-regulated expression of csgD irrespectively of RpoS levels can not be excluded .
In addition , the RpoS-dependent sRNA SdsR controls csgD expression most likely via a transcriptional regulator .
RpoS can bind to the csgD promoter .