Stress-induced modification of <i>Escherichia coli</i> tRNA generates 5-methylcytidine in the variable loop.

ABSTRACT: There has been recent interest in trying to understand the connection between transfer RNA (tRNA) posttranscriptional modifications and changes in-cellular environmental conditions. Here, we report on the identification of the modified nucleoside 5-methylcytidine (m⁵C) in Escherichia coli tRNAs. This modification was determined to be present at position 49 of tRNA Tyr-QUA-II. Moreover, m⁵C levels in this tRNA are significantly elevated under high reactive oxygen specieis (ROS) conditions in E. coli cells. We identified the known ribosomal RNA methyltransferase rsmF as the enzyme responsible for m⁵C synthesis in tRNA and enzyme transcript levels are responsive to elevated levels of ROS in the cell. We further find that changes in m⁵C

SUBMITTER: Valesyan S 

PROVIDER: S-EPMC11572931 | biostudies-literature | 2024 Nov

REPOSITORIES: biostudies-literature