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Heterologous Expression and Functional Analysis of Cytochrome

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Heterologous Expression and Functional Analysis of Cytochrome Friedrich-Schiller-Universität Fakultät für Biowissenschaften Max-Planck-Institut für chemische Ökologie Abteilung Bioorganische Chemie Heterologous expression and functional analysis of cytochrome P450s that are involved in the biosynthesis of defensive compounds in the leaf beetle Phaedon cochleariae Bachelorarbeit zur Erlangung des Grades eines Bachelor of Science vorgelegt von Sarah Baur Geboren am 17.11.1995 in Warrington Jena, Oktober 2018 Gutachter: Prof. Dr. Wilhelm Boland Dr. Antje Burse 2 Table of contents Table of contents……………………………………………..………………………………3 Table of tables and figures……………………………………..……………………………5 Table of abbreviations…………………………………………….………………………… 7 1. Abstract……………………………………………………………..…………………….……… 8 2. Zusammenfassung……………………………………………………………..……………….. 8 3. Introduction………………………………………………………………………...……...……... 9 3.1. Deterring defensive strategy: Chrysomelidial …………………………………... 9 3.2. Toxic defensive strategy: Isoxazolin-5-one and its 3-nitropropionic acid derivatives………………………………………………………………………..…10 3.3. Cytrochrome P450…………………………………………………………………12 3.4. Aim of study…………………………………………………………………………12 4. Methods………………………………………………………………………………………….13 4.1. Generating recombinant plasmids……………………………………………..…13 4.1.1. RNA isolation……………………………………………………………… 13 4.1.2. Reverse Transcription of the RNA…………………………………….…13 4.1.3. Producing blunt end PCR products……………………………………...13 4.1.4. TOPO cloning ……………………………………………………………..14 4.1.5. Colony PCR……………………………………………………………..… 14 4.1.6. Plasmid isolation…………………………………………………………..15 4.2. Expression and analysis of P450…………………………………………………16 4.2.1. Cell line and cultivation……………………………………………………16 4.2.2. Transfection - Electroporation……………………………………………16 4.2.3. Microsome isolation…………………………………………………….…16 4.2.4. Detection of recombinant protein………………………………………...17 4.2.5. Activity test………………………………………………………………… 17 5. Results…………………………………………………………………………..……………… 19 5.1. Generating Recombinant Plasmids………………………………………………19 5.1.1. Creating inserts…………………………………………………………… 19 5.1.2. Positive colonies selection………………………………..………………19 5.2. Heterologous Expression………………………………………………………… 21 5.2.1. Transfection in HEK 293 T cells………………………….………………21 5.3. Analysing P450…………………………………………………….……………… 21 5.3.1. Western Blot………………………………………………….…………… 21 5.3.2. Activity tests………………………………………………………..………22 3 5.3.2.1. Conversion of geraniol by C7758………...…………………22 5.3.2.2. Conversion of β-alanine by C480……………...……………22 6. Discussion………………………………………………………………………………….……25 6.1. Heterologous expression……………………………………………………….…25 6.2. Activity test…………………………………………………………….……………26 7. Outlook………………………………………………………………………..………………… 26 8. References………………………………………………………………………………………27 9. Supplementary material…………………………..…………………...……………………… 29 10. Acknowledgement ……………………………………..……………………………………… 35 11. Declaration of Authenticity……………………………………………………..………………36 4 Table of tables and figures Table 1. Primers……………………………………………………………………..……………… 13 Table 2. PCR Mastermix and program…………………………………………… ………………13 Table 3. PCR Mastermix and program…………………………………………………………….14 Table 4. Chemicals………………………………………………………….……………………… 29 Table 5. Plasmids……………………………………………………………...…………………… 29 Table 6. Media…………………………………………………………………...…………………. 30 Table 7. Enzymes………………………………………………………...………………………… 30 Table 8. Commercial kits………………………………………………………...………………… 30 Table 9. Standards………………………………………………………………….……………… 30 Table 10. Antibody…………………………………………………………………..……………… 31 Table 11. Buffer and supplements…………………………………………………..……………. 31 Table 12. Equipment…………………………………………………………………..…………… 31 Table 13. Consumption items…………………………………………………………...………… 32 Table 14. Buffer……………………………………………………………………………………... 32 5 Figure 1: Proposed biosynthesis of chrysomelidial in P. cochleariae………………...………...10 Figure 2: Proposed biosynthetic pathway for Isoxazolin-5-one-glucoside and its 3-NPA ester………………………………………………………………………………………………......11 Figure 3: 1% agarose gel of the amplified PCR products for C573 with R(+) and without R(-) stop codon……………………………………………………………………………………...………….19 Figure 4: 1% agarose gel of the E. coli colonies 1-16 with the vector pcDNA3.1 C573 R(+)………………………………………………………………………………………………...…20 Figure 5: 1% agarose gel of the E. coli colonies 1-16 with the vector pcDNA3.1 C573 R(-). Colonies 1 to 16………………………………………………..……………………………………20 Figure 6: 1% agarose gel of the E. coli colonies 1-16 with the vector pcDNA3.1 C573 R(-). Colonies 17 to 30……………………………………………………………………………………20 Figure 7: YFP transfected HEK 293 T cells……………………………………………..………. 21 Figure 8: Western Blot of samples taken during the microsome preparation for C7758 and C480…………………………………………………………...…………………………………….. 21 Figure 9: Chromatogram for C7758 or the conversion of geraniol…………….……………… 22 Figure 10: Chromatogram for the activity test of C480 or the conversion of β-alanine…..…23 Figure 11: Mass spectrum to Fig. 11……………………………………………………………...23 Figure 12: Chromatogram for the β-alanine standards………………………………………… 24 Figure 13: Mass spectrum to Fig. 13………………………………………………..………….... 24 6 List of abbreviations 3-NPA 3-nitropropionic acid °C degrees Celsius ATP adenosine triphosphate bp base pair C480 P450 protein, candidate for conversion of β-alanine C573 CPR, coexpressed with C573 C7758 P450 protein, candidate for conversion of geraniol cDNA complementary DNA CPR cytochrome P450 reductase CYP cytochrome P450 DNA deoxyribonucleic acid DTT dithiothreitol E. coli Escherichia coli EDTA ethylenediaminetetraacetic acid g gram GC-MS gas chromatography–mass spectrometry h hour HPLC-MS high-performance liquid chromatography–mass spectrometry k kilo kb kilo base pairs Da Dalton l litre A ampere min minute m milli mRNA messenger RNA (Ribonucleic acid) m/z mass-to-charge ratio M molar μ micro n nano NADPH nicotinamide adenine dinucleotide phosphate -OH -hydroxy ORF open reading frame PBS phosphate-buffered saline PCR polymerase chain reaction PVDF polyvinylidene difluoride rpm rounds per minute RT room temperature s second SDS sodium dodecyl sulfat SDS-PAGE sodium dodecyl sulfate–polyacrylamide gel electrophoresis TAE tris, actetate, EDTA TBS tris-buffered saline V voltage 7 4. Abstract Phaedon cochleariae developed two chemical defensive tactics to defend itself from predators. One is based on the toxic 3-nitropropionic acid (3-NPA), which is stored as isoxazolin-5-one derivative and can be found in every life stage of P. cochleariae, while the other tactic relies on the volatile deterrent chrysomelidial, which is secreted by the larvae’ glandular reservoir upon disturbance. Previous studies have shown two P450s (C7758 and C480) are involved in the biosynthetic pathways of these two compounds, with C7758 related to the production of chrysomelidial while C480 participating in the biosynthesis of isoxazolin-5-one and its 3-NPA derivate. In this study, those two P450s as well as a cytochrome P450 reductase (CPR) were subcloned into mammal expression vector and heterologous expressed in HEK293T cells. The microsomes containing corresponding recombinant proteins were isolated, and their catalytic function against presumable substrates were analysed. Enzymatic analysis showed C7758 converted geraniol to 8-OH-gernaiol and C480 showed no activity to free β- alanine. 5. Zusammenfassung Phaedon cochleariae hat zwei chemische Verteidigungstaktiken entwickelt und sich vor Prädatoren zu verteidigen. Eines basiert auf der toxischen 3-Nitropropionsäure, welches als Isoxazolin-5-one Derivat in jedem Entwicklungsstadium von P. cochleariae gefunden werden kann, während die andere Taktik auf das flüchtige, abschreckende Chrysomelidial beruht, welches durch Beunruhigung von der Larve aus den glandulären Reservoiren sekretiert wird. Vorrangehende Studien zeigten zwei P450-Enzyme (C7758 und C480) auf, welche in die biosynthetischen Stoffwechselwegen dieser zwei Komponenten involviert sind. C7758 wird dabei der Produktion von Chrysomelidial zugeordnet, während C480 an der Biosynthese von Isoxazolin-5-one und deren Derivate der 3-Nitropropionsäure teilnimmt. In dieser Arbeit wurden diese zwei P450-Enzymen sowie eine NADPH-Cytochrom-P450 Oxidoreduktase (CPR) in einen Säugetier-Expressionsvektoren kloniert und heterolog in HEK-293T-Zellen exprimiert. Die Mikrosomen, welche die zugehörigen rekombinanten Proteine beinhalten, wurden isoliert und deren katalytische Funktionen auf vermutete Substrate geprüft. Enzymatische Untersuchungen zeigten, dass C7758 Geraniol zu 8-OH-Geraniol umwandelt und C480 keine Aktivität in Anwesenheit von freien β-Alanin aufweist. 8 6. Introduction Of all described animal species about 25% belong to the order Coleoptera. Beetles are ubiquitous and extremely diverse. They can be divided into the four suborders: Adephaga, Archostemata, Myxophaga and Polyphaga. About 85% of the beetle species belong to the suborder Polyphaga. The species of this suborder vary greatly in size, shape, habit and habitat, and are mostly found on leaves and flowers1. The leaf beetle family Chrysomelidae in the suborder Polyphaga consist of at least 35000 species, which vary greatly in size and color. Its distribution reaches all over the world (except Antarctica) and some species are known to be the “world’s worst economic pests”, while others are used as biological control agents against weeds2. Phaedon cochleariae belongs to the family Chrysomelidae. Their distribution includes most of the northern hemisphere. It is known as a pest on different cruciferous crops, in particular watercress, with all the active stages feeding on the same host3. To defend
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