title: Synthesis and properties of uniquely modified oligoribonucleotides: yeast tRNA(Phe) fragments with 6-methyluridine and 5,6-dimethyluridine at site-specific positions.
abstract: The phosphoramidites of 6-methyluridine and 5,6-dimethyluridine were synthesized and the modified uridines site-selectively incorporated into heptadecamers corresponding in sequence to the yeast tRNA(Phe) anticodon and TpsiC domains. The oligoribonucleotides were characterized by NMR, MALDI-TOF MS and UV-monitored thermal denaturations. The 6-methylated uridines retained the syn conformation at the polymer level and in each sequence location destabilized the RNAs compared to that of the unmodified RNA. The decrease in RNA duplex stability is predictable. However, loss of stability when the modified uridine is in a loop is sequence context dependent, and can not, at this time, be predicted from the location in the loop.
authors.affiliation: Institute of Organic Chemistry, Technical University of Lódz, Poland.
authors.forename: E
authors.initials: E
authors.lastname: Sochacka
authors.forename: G
authors.initials: G
authors.lastname: Czerwinska
authors.forename: R
authors.initials: R
authors.lastname: Guenther
authors.forename: R
authors.initials: R
authors.lastname: Cain
authors.forename: P F
authors.initials: PF
authors.lastname: Agris
authors.forename: A
authors.initials: A
authors.lastname: Malkiewicz
mesh_terms: D000926:Anticodon; D009682:Magnetic Resonance Spectroscopy; D008745:Methylation; D008968:Molecular Conformation; D009843:Oligoribonucleotides / Q000138:chemical synthesis* / Q000737:chemistry; D009943:Organophosphorus Compounds / Q000737:chemistry; D012360:RNA, Transfer, Phe / Q000737:chemistry*; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D014529:Uridine / Q000031:analogs & derivatives* / Q000737:chemistry; D015003:Yeasts / Q000737:chemistry
chemical_list: C412232:5,6-dimethyluridine; D000926:Anticodon; D009843:Oligoribonucleotides; D009943:Organophosphorus Compounds; D012360:RNA, Transfer, Phe; C101323:uridine phosphoramidite; C002353:6-methyluridine; D014529:Uridine