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Transcriptional control of expression of fungal ß-lactam biosynthesis genes

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Abstract

The most commonly used ß-lactam antibiotics for the therapy of infectious diseases are penicillin and cephalosporin. Penicillin is produced as end product by some fungi, most notably by Aspergillus ( Emericella) nidulans and Penicillium chrysogenum. Cephalosporins are synthesised by several bacteria and fungi, e.g. by the fungus Acremonium chrysogenum (syn. Cephalosporium acremonium). The biosynthetic pathways leading to both secondary metabolites start from the same three amino acid precursors and have the first two enzymatic reactions in common. The penicillin biosynthesis is catalysed by three enzymes encoded by acvA ( pcbAB), ipnA (pcbC) and aatA ( penDE). The genes are organised into a cluster. In A. chrysogenum, in addition to acvA and ipnA, which are also clustered, a second cluster contains the genes for enzymes catalysing the reactions of the later steps of the cephalosporin pathway (cefEF, cefG). Transcription of biosynthesis genes is subject to sophisticated control by nutritional factors (e.g. glucose, nitrogen), amino acids such as lysine and methionine, and ambient pH. Some regulators have been identified such as the A. nidulans pH regulatory protein PACC and the transcriptional complex PENR1. PENR1 is a HAP-like transcriptional complex similar or identical to AnCF. Additional positive regulatory factors seem to be represented by recessive trans-acting mutations of A. nidulans ( prgA1, prgB1, npeE1) and P. chrysogenum (carried by mutants Npe2 and Npe3). The GATA-binding factor NRE appears to be involved in the regulation of the penicillin biosynthesis genes by the nitrogen source in P. chrysogenum. Formal genetic evidence suggests the existence of transcriptional repressors as well.

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Authors and Affiliations

  1. Lehrstuhl für Mikrobiologie, Universität München, Maria-Ward-Straße 1a, D - 80638, München, Germay

    Olivier Litzka, Katharina Then Bergh, Jan Van den Brulle, Stefan Steidl & Axel A. Brakhage

  2. Institut für Mikrobiologie und Genetik, Technische Universität Darmstadt, Schnittspahnstrasse 10, D-64287, Darmstadt, Germany

    Stefan Steidl & Axel A. Brakhage

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  1. Olivier Litzka
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  2. Katharina Then Bergh
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  3. Jan Van den Brulle
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  4. Stefan Steidl
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  5. Axel A. Brakhage
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Correspondence to Axel A. Brakhage.

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Litzka, O., Bergh, K.T., den Brulle, J.V. et al. Transcriptional control of expression of fungal ß-lactam biosynthesis genes. Antonie Van Leeuwenhoek 75, 95–105 (1999). https://doi.org/10.1023/A:1001706729545

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