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Revised FR-900098 pathway. Each of the final steps in the FR-900098 biosynthetic pathway has been demonstrated in vitro using purified enzymes. Intermediates in the FR-900098 biosynthetic pathway are as follows: I, phosphoenolpyruvate; II, phosphonopyruvate; III, 2-phosphonomethylmalate; IV, 3-phosphonomethylmalate; V, 2-oxo-4-phosphonobutyrate; VI, 2-amino-4-phosphonobutyrate; VII, CMP-5'-3-aminopropylphosphonate; VIII, CMP-5'-N-hydroxy-3-aminopropylphosphonate; IX. CMP-5'-FR-900098.
