RNA Modified Uridines VI: Conformations of 3-[3-(S)-Amino-3-Carboxypropyl]Uridine (acp3U) from tRNA and 1-Methyl-3-[3-(S)-Amino-3-Carboxypropyl]Pseudouridine (m1acp3Ψ) from rRNA

Abstract
The conformation of chemically synthesized acp3U is 60& 3′-endo, gauche+, whereas that of m1acp3Ψ is 60& 2′-endo, gauche+. We conclude that the difference in conformation probably imparts important local structures to their respective tRNA and rRNA.