Direct regulation of a tRNA modification enzyme by ppGpp links stress signaling to translational control and biofilm development.

In Bacillus subtilis, ppGpp directly inhibits MnmE (TrmE), and this links stress signaling to codon-specific translation control through wobble uridine (mnm) tRNA modification.

• Why it matters: tRNA modifications affect decoding and fidelity, but their integration into bacterial stress and translational regulatory networks is unclear.
• What they did: The study used direct inhibition assays plus high-resolution ribosome profiling in Bacillus subtilis to test how MnmE loss changes translation, focusing on AAG codons and leader peptides.
• The result: MnmE loss selectively increases ribosome pausing at AAG codons and reprograms translation of genes including an AAG-containing leader peptide controlling AbrB, with mnmE mutants showing constitutive extracellular matrix production and bypassing the biofilm defect of a relA mutant.

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