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The Pseudomonas aeruginosa PA3685 locus encodes a conserved protein that shares 49% sequence identity with Escherichia coli YeaZ, which was recently reported as involved in the biosynthesis of threonylcarbamoyl adenosine (t6A), a universal modified tRNA nucleoside. Many YeaZ orthologues were reported as “essential for life” among various bacterial species, suggesting a critical role for both these...