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RaiA ("ribosome-associated inhibitor A", also known as Protein Y (PY), YfiA, and SpotY, is a stress-response protein that binds the ribosomal subunit interface and arrests translation by interfering with aminoacyl-tRNA binding to the ribosomal A site. RaiA is also thought to counteract miscoding at the A site thus reducing translation errors. The RaiA fold structurally resembles the double-stranded RNA-binding domain (dsRBD).
Jiyao W et al.(2023). "The conserved domain database in 2023.",