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Complete Thesis University of Groningen Synthetic biology tools for metabolic engineering of the filamentous fungus Penicillium chrysogenum Polli, Fabiola IMPORTANT NOTE: You are advised to consult the publisher's version (publisher's PDF) if you wish to cite from it. Please check the document version below. Document Version Publisher's PDF, also known as Version of record Publication date: 2017 Link to publication in University of Groningen/UMCG research database Citation for published version (APA): Polli, F. (2017). Synthetic biology tools for metabolic engineering of the filamentous fungus Penicillium chrysogenum. University of Groningen. Copyright Other than for strictly personal use, it is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license (like Creative Commons). The publication may also be distributed here under the terms of Article 25fa of the Dutch Copyright Act, indicated by the “Taverne” license. More information can be found on the University of Groningen website: https://www.rug.nl/library/open-access/self-archiving-pure/taverne- amendment. Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum. Download date: 06-10-2021 Synthetic biology tools for metabolic engineering of the filamentous fungus Penicillium chrysogenum PhD thesis to obtain the degree of PhD at the University of Groningen on the authority of the Rector Magnificus Prof. E. Sterken and in accordance with the decision by the College of Deans. This thesis will be defended in public on Friday 23 June 2017 at 09.00 hours The research described in this thesis was carried out in the Department of Molecular Microbiology of the Groningen Biomolecular Sciences and Biotechnology Institute (GBB), University of Groningen, The Netherlands. It was financially supported by the biobased ecologically balanced sustainable industrial chemistry (BE-BASIC) and DSM Sinochem Pharmaceuticals Netherlands B.V. (The Netherlands). by Cover design, layout and printing: Lovebird design. www.lovebird-design.com ISBN (print): 978-90-367-9934-8 Fabiola Polli ISBN (digital): 978-90-367-9934-8 born on 24 April 1986 Copyright © 2017 by F. Polli. All rights reserved. No parts of this book may be reproduced or transmitted in any form or by any means without prior permission of the author. in Frascati, Italy Supervisors Prof. dr. A.J.M. Driessen Prof. dr. R.A.L. Bovenberg Assessment Committee Prof. dr. L. Dijkhuizen Prof. dr. D.B. Janssen Prof. dr. A.F.J. Ram To my parents... ... Ai miei geniitori per essere stati presenti in ogni momento e per aver sempre sostenuto ogni mia scelta... Grazie! TABLE OF CONTENTS CHAPTER 1 Synthetic biology tools for metabolic engineering of the filamentous fungus Penicillium chrysogenum 9 CHAPTER 2 Towards a secondary metabolite deficient strain of Penicillium chrysogenum 33 CHAPTER 3 New promoters for strain engineering of Penicillium chrysogenum 55 CHAPTER 4 Penicillin biosynthesis pathway reconstruction in Penicillium chrysogenum 79 CHAPTER 5 Summary and concluding remarks 99 Samenvatting 107 Appendix 111 Acknowledgments 115 List of publications 117 References 119 SYNTHETIC BIOLOGY TOOLS FOR METABOLIC ENGINEERING OF THE FILAMENTOUS FUNGUS PENICILLIUM CHRYSOGENUM Fabiola Polli INTRODUCTION The discovery of penicillin by Alexander Fleming in 1928 generated a first understanding of the wide spread nature of the production of antibiotics 1 and other bioactive compounds by filamentous fungi and encouraged research in this direction. While initial research was focused on natural product discovery and classical strain improvement (CSI), later on, it also became possible using recombinant DNA (rDNA) techniques to express heterologous genes in filamentous fungi for the production of semisyn- ABSTRACT thetic antibiotics, such as cephalosporins 1. One of the most important cell factories in antibiotics production is Penicillium chrysogenum Since the application of penicillin and other antibiotics, bacterial resis- the filamentous fungus Penicillium chrysogenum. The initial isolate fungus fungus tance to antibiotics developed hand in hand with their use in combating P. notatum, did not produce enough of the antibiotic for mass produc- infectious disease. Therefore, there is an urgent need for novel mole- tion, and this initially slowed down the introduction of penicillins as anti- cules with unique structures to combat resistance towards existing infectives. Therefore, classical strain improvement (CSI) through radiation antibiotics and that target new essential biological functions for antimi- and chemical mutation followed by selection, has led to strains that pro- crobial therapies. With the recent developments towards an advanced duced increased levels of β-lactams allowing the commercial application of synthetic biology toolbox for filamentous fungi, novel strategies can be this class of compounds and the exploitation of this fermentative process applied for the discovery, production and modification of natural prod- at industrial scale 2. The CSI resulted in many genomic alterations, such ucts into effective antibiotics. as: amplification of the penicillin biosynthetic gene cluster 3, increased Synthetic biology tools for metabolic engineering of the filamentous engineering Synthetic biology tools for metabolic amino acid metabolism 4, proliferation of microbodies that harbor the key enzymes involved in β-lactam synthesis 5, overexpression of various transporters and morphological changes that contribute to the efficiency of large scale fermentation 6. Interestingly, the CSI also resulted in the re- pression and inactivation of other secondary metabolites gene clusters 7, likely to divert nitrogen and carbon sources towards the increased pro- duction of the non-ribosomal peptide precursor of β-lactams, as well as to reduce pigment formation interfering in penicillin product recovery and purification. Recently, Penicillium species have been described that secrete a variety of secondary metabolites 8; 9, but most have not been fully char- acterized or explored for possible pharmaceutical applications 10; 11; 12; 13; 14; 15. Additionally, a potentially interesting feature of the CSI improved P. chrysogenum strains is that they provide a great platform for the fermentative production of semi synthetic antibiotics, as exemplified by a metabolic engineering project on fermentative production of adi- poyl-cephalosporins 16; 17. This was realized by the introduction of a novel, heterologous enzyme, adipoyl-7-aminodeacetoxy-cephalosporanic acid synthase and the feed of adipate as (β-lactam) side chain precursor, al- lowing the rapid development of a new generation of production strains of adipoyl-cephalosporins 18; 19; 20. Introduction 11 REVIEWS fluoroacetate resistance selects for mutants that lack etate, for example, can no longer use acetate — the acetyl CoA synthetase activity15,16. The value of these natural substrate for acetyl CoA synthetase — as the systems is that they allow two-way selection for loss- sole carbon source. Mutants that have regained and regain-of-function mutations in the same gene. enzyme function can then be selected by their ability Mutants that are selected for resistance to fluoroac- to grow on acetate. Box 1 | Life cycle of Aspergillus nidulans The fungal mycelium of One drawback of the use of P. chrysogenum is the poorly developed A. nidulans is a web of branched filaments Ascospore genetic toolbox. In recent years, major advancements have been made (hyphae) of connected compartments or cells, to increase the efficiency of transformation and gene deletion, as well as which each contain several Cleistothecium of the use of plasmids to express heterologous genes. In this thesis, we nuclei (see centre figure). This mycelium, or 1 Ascus 1 will focus on the discovery of novel fungal compounds by deletion of two homokaryon, which develops from a single Conidiospore highly expressed groups of genes involved in secondary metabolites pro- haploid spore, Ascospore differentiates many duction and on the application of different synthetic biology techniques identical asexual spores currently available for genetic engineering of filamentous ascomycetes, known as conidia or conidiospores (see the Meiosis and in particular P. chrysogenum. We will also discuss how these tech- asexual cycle in the figure). A. nidulans is homothallic, niques can be applied to further develop these organisms as cell factories which means that it is self- fertile, but crosses can be Ascogenous for secondary metabolite production. Penicillium chrysogenum initiated by hyphal fusions hypha between homokaryons with genetically different fungus nuclei (shown by white and dark green nuclei). The 1. FILAMENTOUS FUNGI resulting heterokaryons are Haploid homokaryon not stable, but can be forced to maintain a Filamentous fungi are eukaryotic organisms and in the taxonomic group balanced ratio of the component nuclei by of Ascomycota, there is the extensive and important genera that includes Mitotic including complementing ++ nuclear Aspergillus, Penicillium, Fusarium, and Claviceps species 21. They can be auxotrophic mutations
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