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δ-(L-α-Aminoadipyl)-L-cysteinyl-D-valine synthetase, that mediates the first committed step in penicillin biosynthesis, is a cytosolic enzyme

Lende, T. R. V. D., Kamp, M. V. D., Berg, M. V. D., Sjollema, K., Bovenberg, R. A. L., Veenhuis, M., Konings, W. N. & Driessen, A. J. M., 2002, In : Fungal Genetics and Biology. 37, 1, 7 p.

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Penicillin biosynthesis by Penicillium chrysogenum is a compartmentalized process. The first catalytic step is mediated by δ-(L-α-aminoadipyl)-L-cysteinyl-D-valine synthetase (ACV synthetase), a high molecular mass enzyme that condenses the amino acids L-α-aminoadipate, L-cysteine, and L-valine into the tripeptide ACV. ACV synthetase has previously been localized to the vacuole where it is thought to utilize amino acids from the vacuolar pools. We localized ACV synthetase by subcellular fractionation and immuno-electron microscopy under conditions that prevented proteolysis and found it to co-localize with isopenicillin N synthetase in the cytosol, while acyltransferase localizes in microbodies. These data imply that the key enzymatic steps in penicillin biosynthesis are confined to only two compartments, i.e., the cytosol and microbody.
Original languageEnglish
Number of pages7
JournalFungal Genetics and Biology
Volume37
Issue number1
Publication statusPublished - 2002

    Keywords

  • Vacuole, Secondary metabolism, Peptide synthetase, Penicillin biosynthesis, Compartmentalization, β-Lactam antibiotics

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