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“Minimum inhibitory concentrations of beta-lactam antibiotics showed that the presence of threonine at position 237 exerted a dominant effect increasing the enzymes' preference for various early generation cephalosporins over penicillins.”
“Upon addition of methionine, methionine sulfoxide, and threonine , there occurs a marked enhancement of penicillin susceptibility of broth cultures of Brucella, Eberthella, Salmonella, and Shigella.”
The Journal of experimental medicine • 1946 | View Paper
“ Penicillin susceptibility of highly refractory Gramnegative organisms may be greatly enhanced upon addition of methionine, threonine and methionine sulfoxide.”