DEAD-box RNA helicase possibly involved in RNA degradation. Unwinds dsRNA in both 5'- and 3'-directions, has RNA-dependent ATPase activity. ATP + H2O = ADP + H(+) + phosphate Oligomerizes, may be a member of the RNA degradosome. Belongs to the DEAD box helicase family. CshA subfamily. Has been suggested to be found on the cell surface, but its function as an RNA helicase makes this dubious.