HKUST 2011 Igem Team
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HKUST 2011 iGEM Team E. trojan – Boosting the effectiveness of antibiotics through quorum- sensing disruption INTRODUCTION Mistakes… Penicillin G Amikacin, Gentamicin, Kanamycin, Neomycin, Netilmicin, Tobramycin, Paromomycin, Loracarbef, Ertapenem, Doripenem, Imipenem, Meropenem, Cefadroxil, Cefazolin, Cefalotin, Cefalexin, Cefaclor, Cefamandole, Cefoxitin, Cefprozil, Cefuroxime, Cefixime, Cefdinir, Cefditoren, Cefoperazone, Cefotaxime, Cefpodoxime, Ceftazidime, Ceftibuten, Ceftizoxime, Ceftriaxone, Cefepime, Ceftobiprole, Teicoplanin, Vancomycin, Telavancin, Clindamycin, Lincomycin, Daptomycin, Azithromycin, Clarithromycin, Dirithromycin, Erythromycin, Roxithromycin, Troleandomycin, Telithromycin, Spectinomycin, Aztreonam, Furazolidone, Nitrofurantoin, Amoxicillin, Ampicillin, Azlocillin, Carbenicillin, Cloxacillin, Dicloxacillin, Flucloxacillin, Mezlocillin, Methicillin, Nafcillin, Oxacillin, Penicillin, Piperacillin, Temocillin, Ticarcillin, Bacitracin, Colistin, Polymyxin B … Charity Indole Signalling Rearm Antibiotics ReduceAntibiotic Antibiotic-Free Disruption (T4MO) E. TROJAN SelectionUsage E. CRAFT – AN ALTERNATIVE TRANSFORMATION METHOD Essential- gene- based selection method: E. CRAFT Eschericia coli Re-engineered for Antibiotic- Free Transformation Deletion of an essential gene from E. CRAFT’s genome Addiction to extragenomic source of the gene pCarrier, a heat- insensitive analog of pDummy TRANSFORMATION TRANSFORMATION The selection, comparison between successful and unsuccessful transformation PLASMID SHUFFLING Development of addiction: use of the phage λ RED Recombination System Essential Gene Phage λ RED Recombinase circumvents host’s internal barriers against recombination. Presence of homologous sequences allows complementation of the 3’ overhangs of the Foreign dsDNA to the host gDNA, making possible a swap between the two DNA sequences. How to keep the plasmid with no resistance? Mutualistic Plasmids Essential Gene How to keep the plasmid with no resistance? Mutualistic Plasmids ANTIBIOTIC RESISTANT GENE How to keep the plasmid with no resistance? Mutualistic Plasmids ANTIBIOTIC RESISTANT GENE Essential Gene Use of split reporter system as indicator of completion of E. CRAFT construction The E. trojan E. CRAFT + pCarrier with T4MO CHARACTERIZATION OF BIOBRICK BBa_K524000 BioBrick Characterization – BBa_K524000 Heat Sensitive Origin oriR101 & repA101-ts Properties: • Derivative of pSC101 origin • oriR101 positively regulated by a heat liable protein of gene repA101-ts • Stops replication at 420C # # Phillips GJ.(1995). New Cloning Vectors with Temperature-Sensitive Replication, Plasmid. 1999 Jan;41(1):78-81. BioBrick Characterization – BBa_K524000 Heat Sensitive Origin oriR101 & repA101-ts BioBrick Characterization – BBa_K524000 Heat Sensitive Origin oriR101 & repA101-ts FULL DILUTION DISPLAY CULTURE TEST RESULTS RR-1 0 μg/ml kanamycin gradient 25 μg/ml RR-1 0 μg/ml kanamycin gradient with indole 25 μg/ml (300nM/500mM/1mM) Comparison of MICs for indole and non-indole supplemented RR1 1.8 RR1 w/1mM indole 1.6 RR1 w/500μM indole 1.4 RR1 w/300μM indole 1.2 RR1 1 600 0.8 OD 0.6 0.4 0.2 0 0 2 4 6 8 10 12 14 -0.2 Kanamycin concentration (µg/ml) RFP/ RR-1 KanR 0 μg/ml kanamycin gradient 25 μg/ml Ratio of RR1 to RFP in Mixed MIC 100% RR1 90% RFP 80% 70% 60% 50% Ratio 40% 30% 20% 10% 0% 0 5 7 8 10 12 14 16 18 20 25 Kanamycin concentration (µg/ml) T4MO/ RR-1 GFP/ KanR 0 μg/ml kanamycin gradient 25 μg/ml RatioRatio ofof RR1RR1 toto T4MORFP in inMixed Mixed MIC MIC 100% RR1RR1 90% T4MORFP 80% 70% 60% 50% Ratio Ratio 40% 30% 20% 10% 0% 0 5 7 8 10 12 14 16 18 20 25 Kanamycin concentration (µg/ml) 5 Comparison of RFP and T4MO on Charity work T4MO:RR1 RFP:RR1 4 3 2 Ratio 1 0 0 5 10 15 20 25 30 35 -1 Kanamycin concentration (µg/ml) E. trojan • Basis for future model on other pathogenic species which also apply indole charity HUMAN PRACTICE • HKUST Synthetic • Synthetic Biology Biology Workshop Survey 2011 Workshop (17th Sept 2011) 1) Introductory talk on Synthetic Biology 2) “The Life of E. coli” - An educational card game 3) Laboratory tour 4) Creative design for Synthetic Biology Creative Design Take genes from the electricPikachu?! eel and put it into a mouse… Synthetic Biology Survey • A collaboration with IDC and Biofaction • Online format • 570 responses as of 1st Oct 2011 What are your top 3 concerns about Synthetic Biology? Others (1%) None (4%) What are the What is being done to deal scientific processes with the moral and ethical and techniques? issues involved? (9%) (25%) What is being done to regulate and control synthetic biology? (4%) Who is funding the research and why? (3%) Who will get the benefits and who will bear the risks? (17%) What are the claimed benefits? What are the (17%) possible risks? (20%) This is just the beginning… HKUST Synthetic Synthetic Biology Biology Workshop Survey CONCLUSION Conclusion Indole Signalling Antibiotic-Free Disruption (T4MO) E. TROJAN Selection Reduce Antibiotic Rearm Antibiotics Usage Conclusion Klebsiella? S. aureus? YourPathogenic Target? E. coliSalmonella ? P. aeruginosa? E. TROJAN Acknowledgements • IDC - Organisation for International Dialogue and Conflict Management • Biofaction • The Hong Kong Institute of Engineers (HKIE) • The Hong Kong Teachers’ Association (HKTA) • Dr Markus SCHMIDT and Dr Lei PEI • The Provost's Office, HKUST • Division of Biomedical Engineering, HKUST • Division of Life science, HKUST • Department of Social Science, HKUST • Prof. King L. CHOW, Dr Jessica Ce Mun TANG, Prof. Michelle YIK and Mr Jin ZENG • The Coli Genetic Stock Center • Mr. Kevin McClay, Cornell University • iGEM 2011 CUHK team • Life Technology, Inc. • And many others not mentioned. Q&A SECTION .