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Self-assembly of hierarchical magnetic nano- to microstructures: biogenic and biomimetic synthesis of magnetite chains

Member of the SPP1420 from 2009 till 2011

Abstract

Magnetotactic bacteria form intracellular chains of magnetosomes, which display a hierarchically ordered nano- and microstructure over several levels, up to the magnetic control of coordinated alignment and motility of entire populations of cells. The bacterial magnetic structures are formed by biomineralization from membrane-enveloped, biomineralized magnetic nanocrystals, which in turn by self-assembly align into more complex structures. Bacterial magnetosome formation is under strict biological control, which is associated with unprecedented material properties. However, despite of enormous efforts by material sciences, the biogenic magnetic nanoparticles, and in particular, the resulting complex magnetic structures have not been replicated yet by conventional technological approaches. In this project, we suggest a biomimetic approach for the synthesis of hierarchically structured magnetic nanomaterials, which is inspired by the bacterial system. After identification and thorough characterization of the relevant structures and molecular building blocks, we aim to reconstitute in vitro the assembly of magnetic nanocrystals purified from bacteria. In particular, this will involve the bacterial proteins MamK and MamJ which are known to collectively form the cytoskeletal network controlling alignment of magnetosome chains in vivo. Next, biological constituents of the system will be partially substituted and combined with novel material components, such as modified polymeric structures and biomimetic magnetic nanoparticles. Ultimately, we will apply the principles of biological assembly to design hierarchically ordered two- and three-dimensional nano- and microstructures with novel and tailored mechanical, physico-chemical, and magnetic material characteristics.

 

Publications

Peer-reviewed

Proceedings and Book Chapters

  • Körnig A., and Faivre D. (2011) Nanoparticles in magnetotactic bacteria, in Nature’s Nanostructures (ed. A. Barnard), Pan Stanford Publishing, Singapore (in press).
  • Baumgartner J., and Faivre D. (2011) Magnetite Biomineralization in Bacteria, in Progress in Molecular and Subcellular Biology (Vol. 30), Molecular Biomineralization: Aquatic Organisms Forming Extraordinary Materials (ed. W.E.G. Müller), Springer, Heidelberg (in press).

Conference Contributions

  • D. Faivre, High-resolution X-ray diffraction as a tool to study bio- and biomimetic minerals: studies of inorganic magnetite and magnetosomes (Ringberg Symposium 2010: Molecular Bionics – From Biomineralization to Functional Materials, Ringberg Castle, Germany, October 3 – 6, 2010)(Talk).
  • A. Fischer, M. Schmitz, B. Aichmayer, P. Fratzl, and D. Faivre, Structural purity of magnetite nanoparticles in magnetotactic bacteria (Workshop on Magnetotactic Bacteria and Biomineralization, Beijing, China, September 1 – 4, 2010)(Talk).
  • M. A. Carillo, J. Baumgartner, F. Müller, D. Schüler, and D. Faivre, Hierarchical magnetic nanostructures: biogenic and biomimetic chains of magnetite (MSE Meeting, Darmstadt, Germany, August 24 – 26, 2010) (Poster).
  • J. Baumgartner, F. Müller, D. Schüler, and D. Faivre, Self-assembly of hierarchical magnetic nano- to microstructures: biogenic and biomimetic synthesis of magnetite chains (Winterschool of the DFG Priority Program on Biomimetic Materials Research, Kerkrade, the Netherlands, March 23 – 26, 2010) (Talk).
  • A. Fischer, M. Schmitz, P. Fratzl, and D. Faivre, Wide angle X-ray diffraction on magnetite of magnetotactic bacteria (Deutsche Tagung für Forschung mit Synchrotron Strahlung, Neutronen und Ionenstrahlen an Großgeräten, Berlin, Germany, February 24 – 26, 2010)(Poster).
  • J. Baumgartner, A. Fischer, and D. Faivre, Towards biomimetic synthesis and assembly of magnetite nanoparticles (Max Planck Summer School on amorphous solids in physics and biology, Neuhardenberg, Germany, June 1 – 4, 2009)(Poster).
  • A. Fischer, M. Schmitz and D. Faivre, WAXS studies of magnetotactic bacteria and their magnetosomes (European Winter School on neutron and synchrotron radiation (NESY), Planneralm, Austria, March 9 – 13, 2009)(Poster).
  • J. Baumgartner and D. Faivre, Biomimetic synthesis and assembly of magnetite nanoparticles (Linz Winter Workshop, Linz, Austria, February 6 - 9, 2009)(Poster).
  • S. Sonkaria, J. Baumgartner, A. Fischer, M. Schmitz and D. Faivre, Biomimetic synthesis and organization of magnetite nanoparticles (European Conference on Metallobiolomics, Berlin, Germany, December 3 - 4, 2008). (Best Poster Prize)
  • D. Schüler: Invited talks on the topic at: Chinese Academy of Sciences, Beijing, 2009; FEMS Meeting, Göteborg, 2009; Frontiers of Prokaryotic Cell Biology, Oxford, 2009; BacNet Meeting, San Feliu, 2010; 2th International workshop on magnetotactic bacteria, Beijing, 2010; Ringberg Symposium 2010: Molecular Bionics – From Biomineralization to Functional Materials, Ringberg Castle, Germany

Prizes & Media Coverage

Patents

  • Baumgartner J. and Faivre D. (2010) Process for preparing magnetite or maghemite nanoparticles with controlled size using mild conditions, international patent’s application number PCT/EP2010/003983.
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