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+ | <h3> Conference on Expanding the Genetic Code </h3> | ||
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+ | From the beginning, we knew that our project is multi-facetted, and that we would need the insight and expertise of experienced scientists. Therefore, we organized our own open workshop, “EGC: Expanding the Genetic Code”, on August 4th 2017 to obtain some advice and tips for our work. We did not just intend to broaden our horizon regarding the possibilities and challenges of our project, but also to get feedback and help from external experts in synthetic biology. </br> | ||
+ | While the CeBiTec has an excellent reputation as a center for genome research and biotechnology, there is no research related specifically to the expansion of the genetic code. Scientists from the CeBiTec and from Bielefeld University were invited to our workshop. Since there is almost no research on this topic in Bielefeld, the staff benefited from our conference, giving us very positive feedback regarding the workshop. Moreover, we invited interested students to increase the popularity of iGEM and the knowledge about synthetic biology on the campus of Bielefeld University. | ||
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+ | After the official part of the workshop, we had an intense exchange with two of our invited speakers. Iker Valle Aramburu (EMBL Heidelberg, Germany) received a degree in Biochemistry at the University Basque Country, Spain and his MSc in Cell Biology at Heidelberg University. His field of study includes Physical Chemistry, Chemical Kinetics, and Biochemistry. His presentation dealt with “the plasticity of FG-Nucleoporins and NTR interactions”. Due to his experience with small molecular FRET, Mr. Aramburu gave us pointers for our analyzing tool. | ||
+ | Nediljiko “Ned” Budisa is a biochemist and full professor of bio catalysis at the Technical University of Berlin, Germany. He is not just an expert regarding chemical synthetical biology (xenobiology), but also on genetic code engineering, making him an excellent adviser for our project. Ned talked about “the potentials of non-canonical amino acids in synthetic biology and possible alternative life”. His talk gave a broad overview about the field. He put emphasis on the fact that the genetic code is degenerated and for incorporating non-canonical amino acids, an extension of the genetic code is needed. This extension could be achieved by evolution and selection of tRNA/amino acyl-tRNA synthetase pairs. This pair needs to be chosen depending on the chemical properties and conformation of the given non-canonical amino acids to ensure maximal substrate enzyme binding and incorporation efficiency. | ||
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+ | Through the following discussions regarding our project, Professor Budisa’s insight into our project was very important. Given that we want to incorporate non-canonical amino acids into proteins and peptides, he made us aware that we need to look into the formation and capacity of the binding pocket of the synthetases we want to evolve and select for the non-canonical amino acids. He also indicated possible problems for in vivo incorporation of non-canonical amino acids, mainly the elongation factor EF-Tu and the ribosomes. On the topic of unnatural base pairs and incorporation of non-canonical amino acids, Professor Budisa gave us the advice to consider using the synthetase for pyrrolysin. This specific synthetase does not recognize the anticodon loop on its corresponding tRNA. Thus, the changing of the codon and anticodon would possibly not interfere with ribosomal incorporation of a given amino acid using unnatural base pairs. </br> | ||
+ | We are very happy that Prof. Budisa invited us to his laboratory in Berlin. Our team member Olga went to Berlin to work with experts on this research field and to use a sophisticated selection library for the generation of a novel tRNA synthetase. </br> | ||
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+ | <h3> Research in the Budisa Lab, Berlin </h3> | ||
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+ | At the end of September, our team member Olga went to Berlin to work within the Budisa Lab to learn more about distinct methodological approaches needed for the project, mainly to practice the handling of the selection of the aminoacyl-tRNA synthetases, at the invitation of Professor Budisa during our Workshop “Expanding the Genetic Code”. </br> | ||
+ | On the first day, the theoretical background of evolution and selection of the amino acyl/tRNA synthetases was discussed. This step was necessary because many Labs evolve the synthetases according to the non-canonical amino acids they want to utilize, and various selection plasmids and protocols are used for selection processes. </br> | ||
+ | Based on the first positive selection round, problems that may occur in handling the selection process as a whole were explained. The problems compromise for example low transformation rates or low incorporation efficiency of the non-canonical amino acid provided. These particular problems are tried to be eradicated by preparing a fresh batch of competent cells for each selection step and by lowering the concentration of the antibiotic which corresponds to the resistence gene with the blank codon while prolonging the incubation time, respectively. </br> | ||
+ | We decided to study the selection process using two non-canonical amino acids we also use in our toolbox, namely 2-Nitro-L-phenylalanine (2-NPA) and Nε-L-cysteinyl-L-lysin (CL). We were lucky to use existing tyrosyl and pyrrolysyl synthetase libraries provided by the lab, respectively. We were made aware that the selection may not be as efficient as it could be utilizing those libraries, because the synthetases were evolved to bind the distinct non-canonical amino acids we are working with. </br> | ||
+ | During the handling of each first positive selection step, Olga was supervised by Huan Sun (pylRS) and Fabian Schildhauer (tyrRS). </br> | ||
+ | One negative selection round was also performed for CL by Huan Sun. Thought not all of the needed three positive and two negative selection rounds could be performed, the preliminary results seem to be promising. To make sure if the non-canonical amino acid was incorporated through amber codon suppression, Mass Spectrometry needs to be performed. </br> | ||
+ | We thank the whole Budisa Lab, Professor Budisa, Dr. Tobias Baumann, Huan Sun and Fabian Schildhauer for their help, interesting discussions and useful advice even after Olgas stay in Berlin. </br> | ||
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Revision as of 19:07, 31 October 2017
Discussion with Cell Product Purification Experts
Meeting with Prof. Dr. Dirk Lütkemeyer, General Manager of BIBITEC GmbH
Figure 1: Meeting with Prof. Lütkemeyer.
Prof. Dirk Lütkemeyer (BIBITEC GmbH) and team member Yannic during a meeting at the Center for Biotechnology. A detailed discussion provided us with useful advices and opinions about our elution technique and purification column.
Meeting with Dr. Benjamin Müller, CEO of Biofidus AG
Figure 2: Meeting with Dr. Benjamin Müller
Meeting of Yannic Kerkhoff with Dr. Benjamin Müller at his office on the 6th of September to discuss the light-induced elution technique.
Meeting with Prof. Dr. Thomas Noll and Ole Weigelt
Figure 3: Meeting with Prof. Thomas Noll and Ole Weigelt
Group picture after a fruitful meeting about possible marketing and commercialization strategies for our EluX technology.From left to right: Yannic Kerkhoff, Prof. Thomas Noll (co-founder of Xell AG), Ole Weigelt (co-founder of Xell AG, lawyer and tax consultant) and Christopher Whitford.
Both experts pointed out how multifaceted our concept is, as it includes basic molecular biology, cell development, photometry, linker design, cleavage kinetics and media optimization. Eventually, Mr. Weigelt and Prof. Noll advised us in testing the range of wave lengths and light intensities suitable for the cleavage of the target protein without harming either the target protein or the affinity tag. We thus started some investigations into how the UV-light could potentially harm our proteins.
Nagoya-Protocol
The “Nagoya Protocol on Access to Genetic Resources and the Fair and Equitable Sharing of Benefits Arising from their Utilization (ABS) to the Convention on Biological Diversity” entered into force on October 12th, 2014 in Nagoya. It is an international environmental agreement to implement the objectives of the 1993 UN Convention on biological diversity: “the fair and equitable sharing of benefit arising out of the utilization of genetic resources” [2]. Especially developing countries which often have a manifold biodiversity are affected by bio piracy. The Nagoya Protocol intends to ensure that these countries at least profit financially or non-financially by the resulting research and products of their genetic resources. In addition to accessing genetic resources, it covers traditional knowledge concerning these resources. Contracting countries are bound to take action to guarantee informed consent prior to any course of action, as well as impartial benefit-sharing, respecting local laws as well as customary use and exchange.
Today, 100 countries signed the Nagoya Protocol [3]. To succeed, every partner nation should establish ABS National Focal Points, competent national authorities, legislative administrative, national databases, and checkpoints for information.
Germany signed the Nagoya protocol on July 20th, 2016. Our donor of the isoG-metabolism-pathway is Croton tiglium, which is a herb in traditional Asian medicine. Its original occurrence is in the Asian region. To make sure we do not infringe upon the Nagoya Protocol regulations, we clarified the origin of our plant as we got it from the botanical garden of the Phillips University Marburg. Croton tiglium is originally from an undocumented old stock of the botanical garden Giessen. In 1986, the botanical garden Marburg received seeds from this stock. The date on which the EU regulation entered into force was October 2014. All resources collected before this date are not subject to reporting requirements of the Nagoya Protocol in Germany. Thomas Greiber (Federal Agency for Nature Conservation, Head of Division Div I 1.4 “Competent National Authority for the Nagoya Protocol”) confirmed “[..]Therefore, the respective areas of application are not touched by this EU-regulation, and the mentioned regulations are not relevant.”
Therefore, we are allowed to work with the plant and publish information and results about gene sequences and metabolism pathways without violating applicable law.
Merck
Figure 2: iGEM Bielefeld-CeBiTec 2017 team members Olga Schmidt and Markus Haak presenting our project in front of the Merck scientists.
Figure 3: iGEM Bielefeld 2017 team members Olga Schmidt and Markus Haak with representatives from the iGEM Bielefeld 2016 team and Merck.
Conference on Expanding the Genetic Code
Research in the Budisa Lab, Berlin
Talk on single molecule real time sequencing
Figure 4: Upper half: Main slide of the presentation given. Lower half: Members of the team talking to the invited experts prior to the talk.Interested members of the cebitec and our team within the audience.
Experts Overview
Dr. Martin Smith is a computational biologist and head of genomic technologies at the Garvan Institute of Medical Research in Sydney, Australia. His research revolves around biological mechanisms that control how genes are activated and repressed. Dr. Martin Smith is also an expert in Oxford Nanopore Sequencing and gave us very helpful information for sequencing of very low amounts of DNA and single cell sequencing using Oxford Nanopore Sequencing.
Prof. Dr. Thomas Carell is a German chemist and head of the research group Organic and Biomolecular Chemistry at the Ludwig-Maximilians-University Munich. His research focusses on the use of modern synthetic organic chemistry to synthesize naturally occurring modified DNA and RNA bases and to study how chemistry on DNA and RNA bases influences life. Prof. Dr. Thomas Carell is one of the leading experts on DNA and RNA chemistry in Germany.
Prof. Dr. Dirk Lütkemeyer is the General Manager of BIBITEC GmbH. He gave us helpful advice concerning the construction and further development of the purification column eluX.
Dr. Benjamin Müller is the CEO of Biofidus AG, a bioanalytical company located in Bielefeld, Germany. During our meeting we discussed the pros and cons of the light-induced elution method. Furthermore, Dr. Benjamin Müller helped us with several questions about analytics of biomolecules.
Prof. Dr. Thomas Noll is cofounder of Xell AG and professor for cell culture technology at Bielefeld University. Together with Ole Weigelt, he advised us on the possible commercialization of our light-induced elution method and provided some insight into which companies might be interested in such a technology.
Ole Weigelt is tax consultant and lawyer at Weigelt Miersbach Uhlemeyer joint venture partner. Together with Prof. Thomas Noll, he advised us on the possible commercialization of our light-induced elution method and provided some insight into which companies might be interested in such a technology.
Raul Machado is an Assistant Professor at the University of Minho, Portugal, where he focusses on genetically engineered protein-based materials. He gave us advice on finding a method to build silk elastin like proteins by recursive directional ligation (pre RDL).
Dr. Nediljko Budisa is a Professor at the TU Berlin, Germany, at the institute for chemistry. He provided us with valuable information on the aaRS evolution process and gave us access to his lab for one week to work on our project.
Dr. Florian Richter is currently working at Bayer in Cologne, Germany, and greatly helped us getting started with the ROSETTA software for our modeling project.
Iker Valle Aramburu is a predoctoral fellow at the EMBL Heidelberg, Germany. He gave us valuable initial information on labeling non-canonical amino acids.
Dr. Sandip Jadhav is currently working at the department of organic chemistry III at Bielefeld University. As part of a team he provided us with necessary resources to synthesize our own non-canonical amino acid.
Dr. Marcel Frese is currently working at the department of organic chemistry III at Bielefeld University. As part of a team he provided us with necessary resources to synthetize our own non-canonical amino acid.
Dr. Norbert Sewald is Professor at the faculty of chemistry and head of the department of organic chemistry III at Bielefeld University. He and his team provided us with necessary resources to synthetize our own non-canonical amino acid.
Dr. Thorsten Seidel is head of the research group Dynamic Cell Imaging at the faculty of biology at Bielefeld University. He provided us with information on the fluorescence microscope and expertise in bio imaging and the FRET system.
Prof. R. Alta Charo is a professor of law and bioethics at the University of Wisconsin Law School, USA. She gave us valuabel opinions on chances and implications of an expanded genetic code from an ethical and philosophical perspective.
Thomas Greiber is working at the Bundesamt für Naturschutz (Federal Office of Nature Protection) in Bonn, Germany. He gave a talk on the Nagoya Protocol, which was relevant for our work.
During the Labvolution Exhibition in Hannover, Germany, we were able to get in contact with many experts in the field and gather first information relevant for our topic.
Dr. Vitor Pinheiro is a lecturer in synthetic biology and at the ISMB in London, UK, and leader of the Pinheiro Lab. With his expertise, he gave us initial advice regarding our project as a whole.
Dr. Piet Herdewijn is a professor at the faculty of pharmaceutical sciences at the KU Leuven, Belgium. With his expertise, he gave us initial advice regarding our project as a whole.
Dr. Mario F. Feldman is an associate professor of molecular microbiology at the Washington University in St. Louis, USA While deciding on a project topic, he helped us with research with regards to the glycosylation in E. coli.
Dr. Floyd E. Romesberg is professor of chemistry and head of the RomesbergLab at the Scripps Research Institute in California, USA. During the beginning of our project, he gave us motivating advice on our project in general.
Dr. Melanie Schwarz is an account manager at Biolegio. She helped us with regards to oligonucleotides containing unnatural bases and gave us information on annealing and quality control of our work.
Dr.-Ing. Risto Kõiva is the administrative head of the Bielefeld Excellence Cluster "Cognitive Interaction Technology" (CITEC) workshops. He answered our questions with regards to the hardware design and provided resources for building our hardware.