Lactate charging of tRNAs "brakes" the ribosome.

Excess lactate production in cancer cells is linked to AARS1 charging lactate onto tRNAs, creating dead-end lactyl-tRNAs that obstruct translation elongation.

• Why it matters: Tumors export lactate aggressively, but the molecular logic connecting lactate handling to translation control has been unclear.
• What they did: Wang et al. (in Molecular Cell) investigated how excess lactate leads to AARS1-mediated lactyl-tRNA formation and how this affects ribosome progression during elongation.
• The result: This lactyl-tRNA “brake” re-balances metabolism, and cancer cells avoid it by upregulating lactate exporters.

AI summary of the abstract · may contain errors · not medical advice · read the paper.