Fig 5. Deleting hairpin DS prevents formation of the ring-like structure and the RNA remains stable.

(A) Structures predicted to form under low and high arginine conditions (L and H, respectively) are shown. The sequence of hairpin DS is marked in blue. (B) RNA analysis of Ptac-orf34-speF wild type and deletion mutant missing nucleotides C154 to U189 with and without arginine as indicated.