Abstract
One of the three C–P bond formation steps, defined as step 5 in the bialaphos (BA) biosynthetic pathway, was analyzed using a new BA non-producing mutant NP71. The mutant was derived from a BA producer by gene replacement of an unidentified region next to the gene responsible for the step 5 deficiency of the mutant NP213, obtained by conventional mutation procedures. Biochemical analysis of these two mutants indicated that NP71 was defective in the formation of carboxyphosphonoenolpyruvate (CPEP), while NP213 lacked the enzyme CPEP phosphonomutase, which catalyzed the intramolecular rearrangement of CPEP.
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