Puzzle 33
Sequence (5' to 3'):
GGAGUAGAAGCGUUCAGCGGCCGAAAGGCCGCCCGGAAAUUGCUCC
Puzzle: xanthine riboswitch (Ideonella sp. B508-1)
Crystal structure kindly provided by: Aiming Ren
Reference: Insights into xanthine riboswitch structure and metal ion-mediated ligand recognition. Nucleic Acids Res (2021)