RNA chaperone with significant RNA binding, RNA strand exchange and RNA duplexing activities. May regulate ProP activity through an RNA-based, post-transcriptional mechanism. Contains an alpha-helical N-terminal domain (FinO-like) and a beta-sheet C-terminal domain (Hfq-like), connected by an unstructured linker. The FinO-like domain serves as a high-affinity RNA-binding domain, whereas the Hfq-like domain is largely responsible for RNA strand exchange and duplexing. Mutation reduces both the rate and the extent of ProP activation by an osmotic upshift, but does not impair transcription or translation of proP. Belongs to the ProQ family. Truncated N-terminus.