2-Thiouridylic acid

Mazumdar SK, Saenger W, Scheit KH (1974) Molecular structure of poly-2-thiouridylic acid, a double helix with non-equivalent polynucleotide chains. J Mol Biol 85 213-229... 

Arnott S, Chandrasekharan R, Leslie AGW, Puigjaner LC, Saenger W (1981) Structure of the poly(2-thiouridylic) acid duplex. J Mol Biol 149 507-520... 

Unusual nucleic acid base Poiy-4-thiouridylic acid... 

Many unusual nucleotides have been found as minor components of nucleic acids, especially in the soluble or transfer ribonucleic acids. Most of these minor components contain methylated aglycons in their structure. A review of these nucleotides has been presented by Dekker, and general techniques for their isolation as nucleosides have been reported by Hall. In addition, 5,6-dihydrouridylic acid (34) has been isolated by enzymic hydrolysis of certain transfer ribonucleic acids from yeast, and 4-thiouridylic acid (35) was obtained from the alkaline hydrolyzate of transfer ribonucleic acid from Escherichia coli. A nucleotide whose ultraviolet absorption spectrum was very similar to that of 2-thiouridine has been reported to be present in transfer ribonucleic acid. Although the a anomer (36) of cytidylic acid has been detected (and identified) in a yeast ribonucleic acid hydrolyzate, it is not certain whether this -cytidylic acid is a minor component of ribonucleic acid or an artifact produced during the alkaline hydrolysis. Among the minor nucleotide components of transfer ribonucleic acid, pseudouridylic acid (37)89-98 jg unique, in that the D-ribosyl moiety is linked to the aglycon... 

---