title: Compartmentalization and transport in beta-lactam antibiotic biosynthesis by filamentous fungi.
abstract: A proper description of the biosynthesis of fungal beta-lactam antibiotics requires detailed knowledge of the cell biology of the producing organisms. This involves a delineation of the compartmentalization of the biosynthetic pathways, and of the consequential transport steps across the cell-boundary plasma membrane and across organellar membranes. Of the enzymes of the penicillin biosynthetic pathway in Penicillium chrysogenum and Aspergillus nidulans, delta-(L-alpha-aminoadipyl)-L-cysteinyl-D-valine synthetase (ACVS) and isopenicillin N synthase (IPNS) probably have a cytosolic location. Acyl-coenzyme A:isopenicillin N acyltransferase (IAT) is located in microbodies. Of the two enzymes that may be involved in activation of the side chain, acetyl-coenzyme A synthetase (ACS) is located in the cytosol, and phenylacetyl-coenzyme A ligase (PCL) is probably located in the microbody. All enzymes of the cephalosporin biosynthesis pathway in Cephalosporium acremonium probably have a cytosolic location. The vacuole may play an ancillary role in the supply of precursor amino acids, and in the storage of intermediates. The distribution of precursors, intermediates, end- and side-products, the transport of nutrients. precursor, intermediates and products across the plasma membrane, and the transport of small solutes across organellar membranes, is discussed. The relevance of compartmentalization is considered against the background of recent biotechnological innovations of fungal beta-lactam biosynthesis pathways.
authors.affiliation: Department of Molecular Microbiology & Groningen Biomolecular Sciences, University of Groningen, Haren, The Netherlands. kampm@biol.rug.nl
authors.forename: M
authors.initials: M
authors.lastname: van de Kamp
authors.forename: A J
authors.initials: AJ
authors.lastname: Driessen
authors.forename: W N
authors.initials: WN
authors.lastname: Konings
mesh_terms: D000900:Anti-Bacterial Agents / Q000096:biosynthesis*; D001692:Biological Transport; D002451:Cell Compartmentation / Q000502:physiology; D002462:Cell Membrane / Q000378:metabolism; D003904:Mitosporic Fungi / Q000378:metabolism* / Q000648:ultrastructure; D015388:Organelles / Q000378:metabolism; D047090:beta-Lactams
chemical_list: D000900:Anti-Bacterial Agents; D047090:beta-Lactams