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Thiolated nucleotides in yeast transfer RNA.

H M Laten, J H Cramer, R H Rownd

    Biochimica Et Biophysica Acta
    |October 13, 1983
    PubMed
    Summary

    Researchers studied tRNA thiolation in Saccharomyces cerevisiae, finding 5-methoxycarbonylmethyl-2-thiouridine (mcm5s2U) is the primary modified base. This modification was identified in at least two yeast tRNAs, confirming its significance.

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    Area of Science:

    • Molecular Biology
    • Yeast Genetics
    • RNA Biochemistry

    Background:

    • Transfer RNA (tRNA) undergoes various post-transcriptional modifications crucial for its function.
    • Thiolation, the addition of sulfur atoms, is a key modification in tRNA, particularly in the wobble position.
    • Saccharomyces cerevisiae is a model organism for studying fundamental biological processes, including tRNA modification.

    Purpose of the Study:

    • To investigate the extent and variability of tRNA thiolation in Saccharomyces cerevisiae.
    • To identify the specific thiolated uridine derivatives present in S. cerevisiae tRNA.
    • To determine if known thiolated derivatives correspond to previously identified unknown uridine derivatives in yeast tRNA.

    Main Methods:

    • Culturing of Saccharomyces cerevisiae in a magnesium sulfate (MgSO4) containing growth medium.
    • Analysis of tRNA thiolation using chromatographic techniques.
    • Comparison of chromatographic mobility of modified uridine nucleotides with known standards.

    Main Results:

    • 5-methoxycarbonylmethyl-2-thiouridine (mcm5s2U) was identified as the major, and likely sole, thiolated derivative in S. cerevisiae tRNA.
    • Chromatographic analysis confirmed the presence of mcm5s2U in at least two distinct tRNA species.
    • The chromatographic mobility of mcm5s2U matched that of previously reported unknown uridine derivatives in yeast tRNA digests.

    Conclusions:

    • The study elucidates the primary tRNA thiolation product in Saccharomyces cerevisiae.
    • The findings confirm the identity of at least two yeast tRNAs containing the mcm5s2U modification.
    • This research contributes to understanding the diversity and significance of tRNA modifications in eukaryotes.

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