Tokyo-NoKoGen Championship Poster
Transcription
Tokyo-NoKoGen Championship Poster
Introduction Team Abstract Insecticides are not only harmful to insects such as roaches but also pose a risk to mammals. We designed “Exterminator Coli”, an Escherichia coli machine to exterminate roaches while being completely safe for mammals. Roaches store their energy in the form of trehalose, which can be converted to glucose by the enzyme trehalase when needed. However, mammals store their energy in the form of glycogen, which does not require trehalase to be converted to glucose. A trehalase inhibitor can therefore be used as an insecticide that is harmless for mammals. In our project, we constructed a precursor production device and an inhibitor production Exterminator coli device that can be combined to create Exterminator Coli to produce a safe insecticide. eats meal Synthesizer for trehalose OH HO OtsA We selected 3,3‘-diketotrehalose (3,3’-dkT) as trehalase inhibitor. 3,3’-dkT shows an inhibitory effect toward trehalase because of structural similarities to trehalose (Sode et al., 2001). To produce 3,3‘-dkT in E. coli, we focused on glucose-3-dehydrogenase (G3DH), which catalyzes the oxidation of the C-3 hydroxyl group of glucosides, converting them to the corresponding 3-ketoglucosides (Kojima et al., 2001). As G3DH has remarkably wide substrate specificity, it can convert not only monosaccharides but also disaccharides, including trehalose. OH O OH O- UDP OH HO UDP-glucose UDP HO OH O O OH OPO 23 O PPi OH OH OH OtsB OH O OH OH Glucose OH Tokyo University of Agriculture & Technology E-mail: [email protected] Converter for trehalase inhibitor To create a device for the production of the trehalase inhibitor, we used the two genes otsA (trehalose-6-phosphate synthase) and otsB (trehalose-6-phosphate phosphatase), which are required for trehalose production in E. coli (Eastmond et al., 2003). OPO32O Students : Maui NISHIO, Madoka NAGATA, Yuri IKUTA, Yasuko YAMAGISHI, Nanoha SUZUKI, Chika SHONO Saori FUSE, Madoka OKURITA, Miki SANADA Advisors : Prof. Wakako TSUGAWA, Dr. Koichi ABE, Jinhee LEE, Mayumi NAKAMURA, Ippei SAKAMOTO, Dr. James J. ELLINGER Instructors : Prof. Stefano FERRI, Prof. Kazunori IKEBUKURO, Prof. Koji SODE HO OH O OH OH OH HO O OH Trehalose Trehalose-6-phosphate Construct SDS-PAGE analysis otsBA derived from E. coli OtsA and OtsB expression were confirmed. Trehalose Glucose Trehalase Trehalose 2 1 1 3 3,3’-diketotrehalose 2 (3,3’-dkT) 3 3 1 1 2 3 α G3DH γ β SDS-PAGE Analysis Construct G3DH derived from Rhizobium tumefaciens PConst BBa_K1339014 (Phigh) BBa_K1339016 (Pmedium) BBa_K1339018 (Plow) OtsA (53.6 kDa) OtsB (30 kDa) ()AA 48 35 28 PBAD otsBA empty induction + - + - PBAD OtsA 48 35 BBa_K1339022 (Phigh) BBa_K1339023 (Pmedium) BBa_K1339024 (Plow) 1. Trehalose production otsB Improvement otsB Term. The data was uploaded on the registry. Conclusion We constructed Exterminator Coli, which produces a trehalase inhibitor as a safe insecticide. Synthesizer for trehalose ⇒We confirmed the trehalose production in our device by using otsA and otsB genes. Acknowledgements Converter for trehalase inhibitor ⇒We confirmed the trehalase inhibitor production in our device by using G3DH UI-Indonesia, Sumbawagen, Minnesota, UT-Tokyo C 48 6 BBa_K200017 (Imperial College(2009)) RBS 68kDa 48 G3DH Activity Assay DActivity (U/ml) Migration of Pmedium sample was the same as that of standard trehalose sample. The contruct with Pmedium. produced trehalose. 68kDa 75 63 BBa_K1339021 (PBAD) 28 RBS PBAD G3DH empty + - + G3DH expression was confirmed. OtsB Thin layer chromatography (TLC) 75 63 PBAD Glucose-3-dehydrogenase (G3DH) Characterization of other parts induction mw/kDa 100 mw/kDa 100 2. Trehalase inhibitor production mw/kDa 63 BBa_K1339013 (PBAD) PConst z mw/kDa 63 2 5 5.5 Unit/ml 3,3’dkT 4 3 trehalose Red Ox FAD cofactor Ox mediator Bleaching of Dye Red 2 1 0 -1 DActivity (Unit/ml) = Activity of each sample – Activity of empty vector The scheme of G3DH reaction The construct with Plow showed the highest activity. Ox: Oxidized Red: Reduced We investigated G3DH enzymatic activity by spectrophotometric assay. Future work considering “Bio Safety” + = Now we created two devices; trehalose production and trehalase inhibitor production one. To produce trehalase inhibitor from glucose directly, we are going to combine these devices and create complete Exterminator Coli. To reduce risks of Exterminator Coli on the environment… Introducing cockroach pheromone expression system Introducing the light inducible lysis system Human Practice Questionnaires about synthetic biology in Japanese and English ⇒collected about 500 answers not only from Japan but also from other countries! Participation in a school festival ⇒introduced iGEM and synthetic biology to many people! freedesignfile.com