Abstract
The activity of PEP carboxylase (E.C.4.1.1.31) was demonstrated in cell free extracts ofStreptomyces aureofacines. The enzyme was purified 610 fold. AcetylCoA increased the affinity of the purified enzyme for substrate approximately tenfold and doubled the specific activity of the enzyme preparation. Inorganic phosphate was not essential for the reaction; on the contrary, it had an inhibitory effect. Essential cofactors were divalent cations, the most potent of which was Mn2+. The kinetic characters of the purified enzyme were similar to figures for PEP carboxylase from other sources. The substrate saturation function replotted according to the Hill equation showed the extent of intramolecular interactions, reflecting the allosteric nature of the enzyme.
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Dedicated to Academician Ivan Málek on the occasion of his 60th birthday
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Voříšek, J., Powell, A.J. & Vaněk, Z. Regulation of biosynthesis of secondary metabolites. Folia Microbiol 14, 398–405 (1969). https://doi.org/10.1007/BF02872709
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DOI: https://doi.org/10.1007/BF02872709