Phosphoenolpyruvate → Isopenicillin N

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Five μmoles of adenosine triphosphate (ATP), 10 μmoles of phosphoenol pyruvate, and 100 μgrams of pyruvate kinase were incubated for three hours at 25° C. at a pH of 7.2 with 100 μg of "LLD" and 1.0 ml of mutant M-0198 extract produced in accordance with the procedure set forth above. The reaction mixture showed the presence of antibiotic activity equivalent to 2.3 μg/ml using the β-lactam antibiotic, cephalosporin C, as standard i.e. 2.3 units/ml. One unit of antibiotic activity is that which produces the same size inhibitory zone as does 1 μg of cephalosporin C.

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