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Fakultät für Biologie, Chemie und Geowissenschaften

Lehrstuhl für Mikrobiologie – Professor Dr. Dirk Schüler

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Advanced Grant "SYNTOMAGX"

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SYNTOMAGX

A synthetic biology approach for magnetization of foreign organisms by genetic engineering and transplantation of bacterial magnetosome biosynthesis

                                 Project duration: 2016 - 2021

Project Description

An immensely valuable asset to the field of synthetic biology would be a means to genetically endow magnetism to living organisms, which is still an unsolved challenge due to the lack of appropriate tools. In contrast, biomagnetism is innate to magnetotactic bacteria, mud-dwelling microbes which as geomagnetic sensors biomineralize iron nanocrystals with texceptional properties, the magnetosomes.

However, transplantation of magnetosome biosynthesis has remained unachieved for many years, owing to its complexity and lack of knowledge of genetic determinants. Recently, our lab discovered relevant biosynthetic gene clusters and for the first time succeeded in expressing them in a foreign bacterium. Inspired by this major breakthrough, we now will follow a step change approach for endogenous magnetization of diverse organisms based on bacterial magnetosome biosynthesis. By combining systematic genetic reduction with bottom-up redesign we will first minimize the pathway to make it universally portable. We will then aim to reprogram other bacteria into a chassis for plug-in expression of diverse magnetosome gene sets.

SYNTOMAGX

By harnessing determinants of structurally diverse magnetosomes from various bacteria, we will reconfigure the pathway for mix-and-match generation of designer nanoparticles with tuned magnetic properties. Finally, we will attempt to reconstitute key parts of magnetosome formation in eukaryotic hosts by using yeast mitochondria as a universal model. The overall aim is to generate a versatile synthetic toolkit for genetic magnetization of different organisms. This would represent a quantum leap with tremendous impact on various fields of biomedical research and biotechnology. It might be exploited for bioproduction of tailored magnetic nanomaterials with novel and tunable properties. It could be further utilized to generate intracellular labels, tracers and actuators for magnetic manipulation and analysis of cells and organisms in the emerging field of magnetogenetics.

Publications

Uebe, R., F. Ahrens, J. Stang, K. Jaeger, L. Boettger, Chr. Schmidt, B. Matzanke, and D. Schüler. 2019. Bacterioferritin of Magnetospirillum gryphiswaldense is a heterotetraeicosameric complex composed of functionally distinct subunits but is not involved in magnetite biomineralization, mBio, doi: 10.1128/mBio.02795-18.

Pfeiffer, D., M. Toro-Nahuelpan, M. Bramkamp, J. Plitzko, and D. Schüler. 2019. The polar organizing protein PopZ is fundamental for proper cell division and segregation of cellular content in Magnetospirillum gryphiswaldense. mBio, doi.org/10.1128/mBio.02716-18.

Mickoleit, F., Chr.B. Borkner, M. Toro-Nahuelpan, H.M. Herold, D.S. Maier, J. Plitzko, T. Scheibel, and D. Schüler. 2018. In vivo coating of bacterial magnetic nanoparticles by magnetosome expression of spider silk-inspired peptides. Biomacromolecules, doi.org/10.1021/acs.biomac.7b01749.

Mickoleit, F. and D. Schüler. 2018. Generation of nanomagnetic biocomposites by genetic engineering of bacterial magnetosomes. Bioinspired, Biomimetic and Nanobiomaterials, doi.org/10.1680/jbibn.18.00005.

Uebe, R., N. Keren-Khadmy, N. Zeytuni, E. Katzmann, Y. Navon, G. Davidov, R. Bitton, J. Plitzko, D. Schüler, and R. Zarivach. 2018. The dual role of MamB in magnetosome membrane assembly and magnetite biomineralization. Molecular Microbiology, doi.org/10.1111/mmi.13899.

Mickoleit, F. and D. Schüler. 2017. Generation of multifunctional magnetic nanoparticles with amplified catalytic activities by genetic expression of enzyme arrays on bacterial magnetosomes. Advanced Biosystems, doi.org/10.1002/adbi.201700109.

Raschdorf, O., F. Bonn, N. Zeytuni, R. Zarivach, D. Becher, and D. Schüler. 2017. A quantitative assessment of the membrane-integral sub-proteome of a bacterial magnetic organelle. Journal of Proteomics, doi.org/10.1016/j.jprot.2017.10.007.

Uebe, R. and D. Schüler. 2016. Magnetosome biogenesis in magnetotactic bacteria. Nature Reviews Microbiology, doi.org/10.1038/nrmicro.2016.99.


Verantwortlich für die Redaktion: Univ.Prof.Dr. Dirk Schüler

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