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Cleavage of tRNAfMet by VapC inhibits protein synthesis. (A) The VapC proteins from Salmonella enterica serovar LT2 and Shigella flexneri 2a virulence plasmid pMYSH6000 were found to cleave the initiator tRNAfMet within its anticodon stem-loop (yellow arrow). (B) Cleavage of tRNAfMet by VapC results in the generation of tRNA halves and inhibition of protein synthesis.
