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The Journal of Antibiotics
Vol. 32 (1979) No. 6 P 600-606



Mutants have been isolated in which phosphate does not inhibit the biosynthesis of candicidin. At high phosphate concentrations, candicidin production by phosphate-deregulated mutants is still inhibited, but to a lesser extent than in the wild type. Some of these mutants are higher candicidin producers than the wild type, not only in phosphate-supplemented medium but also in non-supplemented production medium. The high candicidin production by these mutants is due to (1) a high specific rate of candicidin biosynthesis and (2) an extended production phase. None of the phosphate-deregulated mutants in which
uptake of [32P]phosphate was measured was a phosphate-permeability mutant.

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