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  • Title: Presence of phosphorylated O-ribosyl-adenosine in T-psi-stem of yeast methionine initiator tRNA.
    Author: Desgrès J, Keith G, Kuo KC, Gehrke CW.
    Journal: Nucleic Acids Res; 1989 Feb 11; 17(3):865-82. PubMed ID: 2646591.
    Abstract:
    We report in this paper on isolation and characterization of two unknown nucleosides G* and [A*] located in the T-psi-stem of yeast methionine initiator tRNA, using the combined means of HPLC protocols, real time UV-absorption spectrum, and post-run mass spectrometry by electron impact or fast atom bombardment. The G* nucleoside in position 65 was identified as unmodified guanosine. The structure of the unknown [A*] in position 64 was characterized as an isomeric form of O-ribosyl-adenosine by comparison of its chromatographic, UV-spectral and mass spectrometric properties with those of authentic O-alpha-ribofuranosyl-(1"----2')-adenosine isolated from biosynthetic poly(adenosine diphosphate ribose). Our studies also brought evidence for the presence of a phosphorylmonoester group located on this new modified nucleoside [A*], when isolated by ion exchange chromatography from enzymic hydrolysis of yeast initiator tRNAMet without phosphatase treatment.
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