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Arthrobacter Nicotinovorans Pao1 a Tool to Produce Neuroactive Compounds

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Arthrobacter Nicotinovorans Pao1 a Tool to Produce Neuroactive Compounds Arthrobacter nicotinovorans pAO1 a tool to produce neuroactive compounds Marius Mihășan, PhD Faculty of Biology Alexandru Ioan Cuza University of Iaşi, Romania E-mail: [email protected] A bit about my home country Romania Alexandru Ioan Cuza University of Iasi Area: 92,043 sq mi Population: 20,121,641 Transylvania Chemistry Biology Lazăr Edeleanu Microbiology: Victor Babeș the first to synthesize amphetamine more than 50 types of bacteria Vintilă Ciocâlteu Bio speleology: Emil Racoviță co-developed the Folin-Ciocalteu reagent the first to study the arctic life Nicolae Teclu Cell Biology: Emil Palade the Teclu burner the most influential cell biologist ever 5/6/17 Arthrobacter nicotinovorans pAO1 as a tool to produce neuroactive compounds Slide 2 / 27 Alexandru Ioan Cuza University of Iaşi Facts and figures ü The oldest Romanian university ü Diplomas recognized all over Europe Sciences Social Sciences & Humanities ü15 departments ü Biology ü Economics and Business Administration ü Chemistry ü History ü 93 Bachelor programs ü Computer Science ü Law ü Geography and Geology ü Letters ü Mathematics ü Orthodox Theology ü 176 Master programs ü Physics ü Philosophy and Social – Political Sciences ü Physical Education and Sports ü 26 PhD programs ü Psychology and Education Sciences ü Roman – Catholic Theology ü Center for European Studies 5/6/17 Arthrobacter nicotinovorans pAO1 as a tool to produce neuroactive compounds Slide 3 / 27 Department of Biology Bulevardul Carol I nr. 20A, Iaşi, Romania, 700505 Tel.:+40(0)232201072 Fax: 40(0)232201472 www.bio.uaic.ro Founded in 1948 ü 758 students: • 20 PhD students ü46 full-time faculty members ü 16 technicians and administrative staff 5/6/17 Arthrobacter nicotinovorans pAO1 as a tool to produce neuroactive compounds Slide 4 / 27 Programs of Study Biology BACHELOR Biochemistry semesters Environmental science Molecular genetics MASTER Biology Cellular and microbial biotech. Biodiversity Conservation Environment Counceling PhD 5/6/17 Arthrobacter nicotinovorans pAO1 as a tool to produce neuroactive compounds Slide 5 / 27 Study Programs Why I am in Potsdam? Sponsor: U.S. Department of State Romanian-U.S. Fulbright Commission Exchange Visitor Program Number G-1-00005 • Observe and learn the dynamics of a research group here in US • Attend lectures and understand the US academic system • Identify all the nicotine-induced proteins in Arthrobacter nicotinovorans by means of mass-spectrometry 6 months in Darie’s Biochemistry & Proteomics Group Department of Chemistry & Biomolecular Science, Clarkson University 5/6/17 Arthrobacter nicotinovorans pAO1 as a tool to produce neuroactive compounds Slide 6 / 27 Nicotine and nicotine-containing waste Nicotine • Produced by the tobacco plant to prevent consumption by herbivores • Responsible for smoking addiction - by releasing dopamine • Potentially lethal to humans (LD50 0.5 – 1.0 mg/kg) • Improves cognition, alertness, memory Nicotiana tabacum nAChRs - Nicotine acetylcholine receptors ligand-gated ion channel superfamily of neurotransmitter receptors Nicotine is a lead compound used for developing drugs for cognitive dysfunctions Levin ED and Rezvani AH. Nicotinic treatment for cognitive dysfunction. Curr DrugTargets CNS Neurol Disord. 2002;1(4):423-31. Taly et. all. Nicotinic receptors: allosteric transitions and therapeutic targets in the nervous system Nat. Rev. Drug Discov.2009, 8, 733-750. 5/6/17 Arthrobacter nicotinovorans pAO1 as a tool to produce neuroactive compounds Slide 7 / 27 Nicotine and nicotine-containing waste Tobacco industry produces 300 000 tons of non- recyclable nicotine-containing waste, 18 g nicotine/per kg • According to EPA the waste is Toxic Release Inventory (TRI) chemicals • According to the European Union Regulations (EUR) - “toxic and hazardous”(when nicotine content is over 0.05% w/w) Production in Country or region thousands of tons World 7176 China 2995 Brazil 862 GHS06 GHS09 India 720 United States 397 This waste is simply discarded in the environment European Union 262 According to FAOSTAT data, 2014 Why not using this waste to produce nicotine-based chemicals and drugs? Novotny TE et al. The environmental and health impacts of tobacco agriculture, cigarette manufacture and consumption. Bull World Health Organ.. 2015;93(12):877-880. 5/6/17 Arthrobacter nicotinovorans pAO1 as a tool to produce neuroactive compounds Slide 8 / 27 What is Arthrobacter nicotinovorans? Why are we still studying bacteria? Arthrobacter Photo by: T. Tamura, T. Nishii & K. Hatano Arthrobacter nicotinovorans can grow on media containing up Microorganism isolated from to 6 g/L nicotine tobacco cultivated soil Dana Krempels, Introduction to Evolution, http://www.bio.miami.edu/dana/107/107F10_5print.html 5/6/17 Arthrobacter nicotinovorans pAO1 as a tool to produce neuroactive compounds Slide 9 / 27 Arthrobacter nicotinovorans and nicotine degradation Brandsch group, Albert Ludwigs University of Freiburg, Germany isolation and sequencing of the plasmid Arthrobacter Oxydans 1 – pAO1 Nicotine metabolism Carbohydrate catabolism Transposons and insertion elements Plasmid replication, partition and conjugation; 5/6/17 Arthrobacter nicotinovorans pAO1 as a tool to produce neuroactive compounds Slide 10 / 27 The nic gene cluster on pAO1 kdhS ndhM transp coxF coxD coxG pkc mobA coxE nit dhph kdhL ponH kdhM 6hlno ndhLndhS IS1473 II TRu TRd I Tn554 nepA perm transp Tn554 nbor mao sad nepB folD abo purU 49500 pmfR III IV moaD moeA modA modC lacI hdno trsp moaA moaC modB Nicotine catabolism, experimental Nicotine catabolism, putative hdnoR V VI 118000 Transcription factors, experimental or putative Putative ORFs, no function Transposons and insertion elements 5/6/17 Arthrobacter nicotinovorans pAO1 as a tool to produce neuroactive compounds Slide 11 / 27 The nicotine break-down pathway in A. nicotinovorans I VI II IV III Mihasan M. Arthrobacter nicotinovorans – new insights into its metabolism, molecular genetics and biotechnological applications, Habilitation thesis, Iasi, 2016 5/6/17 Arthrobacter nicotinovorans pAO1 as a tool to produce neuroactive compounds Slide 12 / 27 Upper nicotine pathway in A. nicotinovorans Nicotine 6-OH, L-Nicotine oxidase dehydrogenase 6-OH, D-Nicotine oxidase Nicotine 6-OH NicotineN 6-OH, CH3-Myosmine 6HNic Ketone dehydrogenase 6-OH PseudooxinicotineN 2,6-diOH Pseudooxinicotine N I VI NDH – nicotine dehydrogenase 6-OH L–Nicotine oxidase KDH – ketone dehydrogenase and heterotrimeric (αβγ)2 enzymes FAD , MCD and FeS clusters 6-OH D–Nicotine oxidase absolute stereospecificity, genetically and structurally unrelated flavoenzymes V Kachalova et al., 2010, J Molec Biol., 396(3):785-799 5/6/17 Arthrobacter nicotinovorans pAO1 as a tool to produce neuroactive compounds Slide 13 / 27 The nicotine break-down pathway in A. nicotinovorans I VI II IV III 5/6/17 Arthrobacter nicotinovorans pAO1 as a tool to produce neuroactive compounds Slide 14 / 27 Pyridine ring metabolism in A. nicotinovorans II 2,6-diOH PseudooxinicotineN An α/β fold C-C bond hydrolase 2,6-diOH Pseudooxinicotine hydrolase no sequence similarity to known bacterial meta-cleavage c-c bond hydrolases Methyl-γ-aminobutyricN acid 2,6-diOHN Pyridine MGABA 2,6-diOH Pyridine hydroxylase 2,3,6-triOHN Pyridine Nicotine-blue Oxidoreductase Schleberger et al., 2006, J Molec Biol., 367(2):409-418 Mihasan et al. 2007 Appl Environ Microbiol 73 (8), 2479-2485. 5/6/17 Arthrobacter nicotinovorans pAO1 as a tool to produce neuroactive compounds Slide 15 / 27 The nicotine break-down pathway in A. nicotinovorans I VI II IV III 5/6/17 Arthrobacter nicotinovorans pAO1 as a tool to produce neuroactive compounds Slide 16 / 27 Side chain metabolism in A. nicotinovorans Methyl-γ-aminobutyric acid Oxidoreductase Amine IV Oxidase Genetic or γ-aminobutyric acid allosteric Monoamine regulation probably Oxidase switches between the two variants III Dehydrogenase 5/6/17 Arthrobacter nicotinovorans pAO1 as a tool to produce neuroactive compounds Slide 17 / 27 Blank spots in nicotine metabolic pathway in A. nicotinovorans 1. Is Nicotine-Blue (NB) the final product of the pathway? A. Nicotine-blue is consumed in old cultures A pyridine ring cleaving enzyme must exist Unknown enzyme? Razavn B., B.Sc Doina G. B.Sc Chromosomal gene? Andreea A., M.Sc B. A ω-amidase for α-ketoglutaramate is part of the nic-gene cluster 2,3,6-triOH 3,6-diOH α-keto- Pyridine 2-Pyridinon glutamarate Flexible targeted docking ω-amidase Cobzaru, C., et al. (2011) Research in Microbiology, 162(3), 285–91. Petra G. Nicotine-blue α-keto-glutarate 5/6/17 Arthrobacter nicotinovorans pAO1 as a tool to produce neuroactive compounds Slide 18 / 27 Blank spots in nicotine metabolic pathway of A. nicotinovorans 2. How is nicotine transported across the cell membrane? L-nicotine uptake in A. nicotinovorans: facilitated diffusion • Dependent on nicotine degradation but not on pAO1 driven by the nicotine gradient due • Energy-independent to its intracellular degradation • Saturable with a K(m) of 6.2 microM and a V(max) of => 0.70 micromol/ min/mg protein) by a unknown Ganas & Brandsch, 2009, Microbiology, 155: 1866–77 chromosomal permease 3. Several other bacteria have the nic gene cluster, but not a functional nicotine catabolism pAO1 AK-YN10 99% sequence identity between key nic-genes in A. nicotinovorans and AK-YN10. Same nic-genes but no Razvan B, M.Sc Victor B., M.Sc. France nicotine metabolism AK-YN10 contains a plasmid Some chromosomal genes must be directly/indirectly involved in nic catabolism 5/6/17 Arthrobacter nicotinovorans pAO1 as a tool to produce neuroactive compounds Slide 19 / 27 Potential applications of the nic-pathway 1. Decontamination of nicotine-containing waste, soil and water from tobacco industry 2. Engineering the nic-pathway for the production of value-added chemicals 5/6/17 Arthrobacter nicotinovorans pAO1 as a tool to produce neuroactive compounds Slide 20 / 27 6-hydroxy-L-nicotine – a neuroactive agent? Nicotine improves memory by binding to nAChRs subtypes α4β2 Murray and Abeles, Aging & Mental Health. 2002, 6, 129–138. Could nicotine derivatives from Arthrobacter also bind nAChR’s? In silico - Targeted docking – rigid receptor subunits A and B from PDB ID 1UW6 - targeted region - a cube of aprox.
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