May play a role in reduction of the SoxR iron-sulfur cluster. May work together with the RsxABCDGE complex. According to PubMed:9159522, insertion mutant shows a modest reduction in sigma-E (rpoE) activity. However, PubMed:9159523 shows that deletion of the gene has no effect on sigma-E activity (PubMed:9159522, PubMed:9159523). Deletion of the gene enhances soxS expression (PubMed:12773378). Mutant shows increased motility and biofilm formation (PubMed:18344336). Deletion mutant is more sensitive than wild-type specifically to hydrogen peroxide exposure, but not other stresses (PubMed:24580753). Part of the rseD-rpoE-rseA-rseB-rseC operon (PubMed:9159522, PubMed:9159523, PubMed:28924029). Belongs to the RseC family. Was originally suggested to positively regulate sigma-E activity in vitro.