SUMMARY: possesses a permease specific for L-methionine (K of 0.1 to 0.2 µM). Competition studies have shown that the permease has little or no affinity for the other L-amino acids commonly found in proteins. Methionine uptake was competitively inhibited by the growth inhibitory analogues DL-ethionine, α-methyl-DL-methionine and DL-methionine-DL-sulphoximine. Mutants resistant to α-methyl-methionine and methionine sulphoximine have been isolated which were severely defective in the methionine specific permease. Two of these mutants, and , mapped away from all previously located methionine structural and regulatory genes.


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