Rescues ribosomes stalled at the 3' end of non-stop mRNAs. Recruits release factor 2 (RF2) to the stalled ribosome, helping position it correctly in the ribosomal A site so its GGQ motif can hydrolyze the peptidyl-tRNA bond (By similarity). Interacts with the 70S ribosome and release factor 2. Belongs to the alternative ribosome-rescue factor A family.