1
|
Schmidt U, Biere N, Johann F, Lea J, Kreissl S, Zimmer D. Correlative Microscopy Applied to Battery Research. Microsc Microanal 2023; 29:1994-1995. [PMID: 37612918 DOI: 10.1093/micmic/ozad067.1032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/25/2023]
Affiliation(s)
| | | | | | - Joshua Lea
- Oxford Instruments, High Wycombe, United Kingdom
| | | | | |
Collapse
|
2
|
Biere N, Kreft D, Walhorn V, Schwarzbich S, Glaser T, Anselmetti D. Dinuclear complex-induced DNA melting. J Nanobiotechnology 2023; 21:26. [PMID: 36691056 PMCID: PMC9869567 DOI: 10.1186/s12951-023-01784-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2022] [Accepted: 01/15/2023] [Indexed: 01/24/2023] Open
Abstract
Dinuclear copper complexes have been designed for molecular recognition in order to selectively bind to two neighboring phosphate moieties in the backbone of double strand DNA. Associated biophysical, biochemical and cytotoxic effects on DNA were investigated in previous works, where atomic force microscopy (AFM) in ambient conditions turned out to be a particular valuable asset, since the complexes influence the macromechanical properties and configurations of the strands. To investigate and scrutinize these effects in more depth from a structural point of view, cutting-edge preparation methods and scanning force microscopy under ultra-high vacuum (UHV) conditions were employed to yield submolecular resolution images. DNA strand mechanics and interactions could be resolved on the single base pair level, including the amplified formation of melting bubbles. Even the interaction of singular complex molecules could be observed. To better assess the results, the appearance of treated DNA is also compared to the behavior of untreated DNA in UHV on different substrates. Finally, we present data from a statistical simulation reasoning about the nanomechanics of strand dissociation. This sort of quantitative experimental insights paralleled by statistical simulations impressively shade light on the rationale for strand dissociations of this novel DNA interaction process, that is an important nanomechanistic key and novel approach for the development of new chemotherapeutic agents.
Collapse
Affiliation(s)
- Niklas Biere
- grid.7491.b0000 0001 0944 9128Experimental Biophysics & Applied Nanoscience, Faculty of Physics, Bielefeld University, 33615 Bielefeld, Germany
| | - Dennis Kreft
- grid.7491.b0000 0001 0944 9128Experimental Biophysics & Applied Nanoscience, Faculty of Physics, Bielefeld University, 33615 Bielefeld, Germany
| | - Volker Walhorn
- grid.7491.b0000 0001 0944 9128Experimental Biophysics & Applied Nanoscience, Faculty of Physics, Bielefeld University, 33615 Bielefeld, Germany
| | - Sabrina Schwarzbich
- grid.7491.b0000 0001 0944 9128Lehrstuhl für Anorganische Chemie I, Faculty of Chemistry, Bielefeld University, 33615 Bielefeld, Germany
| | - Thorsten Glaser
- grid.7491.b0000 0001 0944 9128Lehrstuhl für Anorganische Chemie I, Faculty of Chemistry, Bielefeld University, 33615 Bielefeld, Germany
| | - Dario Anselmetti
- grid.7491.b0000 0001 0944 9128Experimental Biophysics & Applied Nanoscience, Faculty of Physics, Bielefeld University, 33615 Bielefeld, Germany
| |
Collapse
|
3
|
Sabadasch V, Dirksen M, Fandrich P, Cremer J, Biere N, Anselmetti D, Hellweg T. Pd Nanoparticle-Loaded Smart Microgel-Based Membranes as Reusable Catalysts. ACS Appl Mater Interfaces 2022; 14:49181-49188. [PMID: 36256601 DOI: 10.1021/acsami.2c14415] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
In this work, palladium-loaded smart membranes made by UV cross-linking of thermoresponsive microgels are prepared to obtain a reusable, catalytically active material which can, for example, be implemented in chemical reactors. The membranes are examined with respect to their coverage of a supporting mesh via atomic force microscopy measurements. Force indentation mapping was performed in the dried, collapsed state and in the swollen state in water to determine the Young modulus. Furthermore, we compare the catalytic activity of the membrane with the corresponding suspended colloidal nanoparticle microgel hybrids. For this purpose, the reduction of 4-nitrophenol is an established model reaction to quantify the catalytic activity by UV-vis spectroscopy. The membrane is embedded inside a continuous stirred tank reactor equipped for continuous monitoring of the reaction progress. Although catalysis with membranes shows lower catalytic activity than freely dispersed particles, membranes allow straightforward separation and recycling of the catalyst. The fabricated membranes in this work show no decrease in catalytic activity between several cycles, unlike free particles. The feasible and durable deposition of catalytically active inter-cross-linked microgel particles on commercial nylon meshes as supporting scaffolds, as demonstrated in this work, is promising for up-scaling of continuous industrial processes.
Collapse
Affiliation(s)
- Viktor Sabadasch
- Department of Chemistry, Physical and Biophysical Chemistry, Bielefeld University, Universitätsstraße 25, 33615Bielefeld, Germany
| | - Maxim Dirksen
- Department of Chemistry, Physical and Biophysical Chemistry, Bielefeld University, Universitätsstraße 25, 33615Bielefeld, Germany
| | - Pascal Fandrich
- Department of Chemistry, Physical and Biophysical Chemistry, Bielefeld University, Universitätsstraße 25, 33615Bielefeld, Germany
| | - Julian Cremer
- Department of Physics, Experimental Biophysics & Applied Nanosciences, Bielefeld University, Universitätsstraße 25, 33615Bielefeld, Germany
| | - Niklas Biere
- Department of Physics, Experimental Biophysics & Applied Nanosciences, Bielefeld University, Universitätsstraße 25, 33615Bielefeld, Germany
| | - Dario Anselmetti
- Department of Physics, Experimental Biophysics & Applied Nanosciences, Bielefeld University, Universitätsstraße 25, 33615Bielefeld, Germany
| | - Thomas Hellweg
- Department of Chemistry, Physical and Biophysical Chemistry, Bielefeld University, Universitätsstraße 25, 33615Bielefeld, Germany
| |
Collapse
|
4
|
Stohmann P, Koch S, Yang Y, Kaiser CD, Ehrens J, Schnack J, Biere N, Anselmetti D, Gölzhäuser A, Zhang X. Investigation of electron-induced cross-linking of self-assembled monolayers by scanning tunneling microscopy. Beilstein J Nanotechnol 2022; 13:462-471. [PMID: 35673603 PMCID: PMC9152271 DOI: 10.3762/bjnano.13.39] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Accepted: 05/11/2022] [Indexed: 06/15/2023]
Abstract
Ultrathin membranes with subnanometer pores enabling molecular size-selective separation were generated on surfaces via electron-induced cross-linking of self-assembled monolayers (SAMs). The evolution of p-terphenylthiol (TPT) SAMs on Au(111) surfaces into cross-linked monolayers was observed with a scanning tunneling microscope. As the irradiation dose was increased, the cross-linked regions continued to grow and a large number of subnanometer voids appeared. Their equivalent diameter is 0.5 ± 0.2 nm and the areal density is ≈1.7 × 1017 m-2. Supported by classical molecular dynamics simulations, we propose that these voids may correspond to free volumes inside a cross-linked monolayer.
Collapse
Affiliation(s)
- Patrick Stohmann
- Physics of Supramolecular Systems and Surfaces, Faculty of Physics, Bielefeld University, 33615 Bielefeld, Germany
| | - Sascha Koch
- Physics of Supramolecular Systems and Surfaces, Faculty of Physics, Bielefeld University, 33615 Bielefeld, Germany
| | - Yang Yang
- Physics of Supramolecular Systems and Surfaces, Faculty of Physics, Bielefeld University, 33615 Bielefeld, Germany
- Department of Chemical Engineering, Imperial College London, London SW7 2AZ, United Kingdom
| | - Christopher David Kaiser
- Physics of Supramolecular Systems and Surfaces, Faculty of Physics, Bielefeld University, 33615 Bielefeld, Germany
| | - Julian Ehrens
- Condensed Matter Theory Group, Faculty of Physics, Bielefeld University, 33615 Bielefeld, Germany
| | - Jürgen Schnack
- Condensed Matter Theory Group, Faculty of Physics, Bielefeld University, 33615 Bielefeld, Germany
| | - Niklas Biere
- Experimental Biophysics and Applied Nanoscience, Faculty of Physics, Bielefeld University, 33615 Bielefeld, Germany
| | - Dario Anselmetti
- Experimental Biophysics and Applied Nanoscience, Faculty of Physics, Bielefeld University, 33615 Bielefeld, Germany
| | - Armin Gölzhäuser
- Physics of Supramolecular Systems and Surfaces, Faculty of Physics, Bielefeld University, 33615 Bielefeld, Germany
| | - Xianghui Zhang
- Physics of Supramolecular Systems and Surfaces, Faculty of Physics, Bielefeld University, 33615 Bielefeld, Germany
| |
Collapse
|
5
|
Yang Y, Hillmann R, Qi Y, Korzetz R, Biere N, Emmrich D, Westphal M, Büker B, Hütten A, Beyer A, Anselmetti D, Gölzhäuser A. Ultrahigh Ionic Exclusion through Carbon Nanomembranes. Adv Mater 2020; 32:e1907850. [PMID: 31945240 DOI: 10.1002/adma.201907850] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2019] [Revised: 12/19/2019] [Indexed: 06/10/2023]
Abstract
The collective "single-file" motion of water molecules through natural and artificial nanoconduits inspires the development of high-performance membranes for water separation. However, a material that contains a large number of pores combining rapid water flow with superior ion rejection is still highly desirable. Here, a 1.2 nm thick carbon nanomembrane (CNM) made from cross-linking of terphenylthiol (TPT) self-assembled monolayers is reported to possess these properties. Utilizing their extremely high pore density of 1 sub-nm channel nm-2 , TPT CNMs let water molecules rapidly pass, while the translocation of ions, including protons, is efficiently hindered. Their membrane resistance reaches ≈104 Ω cm2 in 1 m Cl- solutions, comparable to lipid bilayers of a cell membrane. Consequently, a single CNM channel yields an ≈108 higher resistance than pores in lipid membrane channels and carbon nanotubes. The ultrahigh ionic exclusion by CNMs is likely dominated by a steric hindrance mechanism, coupled with electrostatic repulsion and entrance effects. The operation of TPT CNM membrane composites in forward osmosis is also demonstrated. These observations highlight the potential of utilizing CNMs for water purification and opens up a simple avenue to creating 2D membranes through molecular self-assembly for highly selective and fast separations.
Collapse
Affiliation(s)
- Yang Yang
- Faculty of Physics, Bielefeld University, 33615, Bielefeld, Germany
- Department of Chemical Engineering, Imperial College London, London, SW7 2AZ, UK
| | - Roland Hillmann
- Faculty of Physics, Bielefeld University, 33615, Bielefeld, Germany
| | - Yubo Qi
- Faculty of Physics, Bielefeld University, 33615, Bielefeld, Germany
| | - Riko Korzetz
- Faculty of Physics, Bielefeld University, 33615, Bielefeld, Germany
| | - Niklas Biere
- Faculty of Physics, Bielefeld University, 33615, Bielefeld, Germany
| | - Daniel Emmrich
- Faculty of Physics, Bielefeld University, 33615, Bielefeld, Germany
| | - Michael Westphal
- Faculty of Physics, Bielefeld University, 33615, Bielefeld, Germany
| | - Björn Büker
- Faculty of Physics, Bielefeld University, 33615, Bielefeld, Germany
| | - Andreas Hütten
- Faculty of Physics, Bielefeld University, 33615, Bielefeld, Germany
| | - André Beyer
- Faculty of Physics, Bielefeld University, 33615, Bielefeld, Germany
| | - Dario Anselmetti
- Faculty of Physics, Bielefeld University, 33615, Bielefeld, Germany
| | - Armin Gölzhäuser
- Faculty of Physics, Bielefeld University, 33615, Bielefeld, Germany
| |
Collapse
|
6
|
Feiner RC, Teschner J, Teschner KE, Radukic MT, Baumann T, Hagen S, Hannappel Y, Biere N, Anselmetti D, Arndt KM, Müller KM. rAAV Engineering for Capsid-Protein Enzyme Insertions and Mosaicism Reveals Resilience to Mutational, Structural and Thermal Perturbations. Int J Mol Sci 2019; 20:ijms20225702. [PMID: 31739438 PMCID: PMC6887778 DOI: 10.3390/ijms20225702] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2019] [Revised: 11/08/2019] [Accepted: 11/11/2019] [Indexed: 12/22/2022] Open
Abstract
Recombinant adeno-associated viruses (rAAV) provide outstanding options for customization and superior capabilities for gene therapy. To access their full potential, facile genetic manipulation is pivotal, including capsid loop modifications. Therefore, we assessed capsid tolerance to modifications of the structural VP proteins in terms of stability and plasticity. Flexible glycine-serine linkers of increasing sizes were, at the genetic level, introduced into the 587 loop region of the VP proteins of serotype 2, the best studied AAV representative. Analyses of biological function and thermal stability with respect to genome release of viral particles revealed structural plasticity. In addition, insertion of the 29 kDa enzyme β-lactamase into the loop region was tested with a complete or a mosaic modification setting. For the mosaic approach, investigation of VP2 trans expression revealed that a Kozak sequence was required to prevent leaky scanning. Surprisingly, even the full capsid modification with β-lactamase allowed for the assembly of capsids with a concomitant increase in size. Enzyme activity assays revealed lactamase functionality for both rAAV variants, which demonstrates the structural robustness of this platform technology.
Collapse
Affiliation(s)
- Rebecca C. Feiner
- Cellular and Molecular Biotechnology, Faculty of Technology, Bielefeld University, 33615 Bielefeld, Germany; (R.C.F.); (J.T.); (K.E.T.); (M.T.R.)
| | - Julian Teschner
- Cellular and Molecular Biotechnology, Faculty of Technology, Bielefeld University, 33615 Bielefeld, Germany; (R.C.F.); (J.T.); (K.E.T.); (M.T.R.)
| | - Kathrin E. Teschner
- Cellular and Molecular Biotechnology, Faculty of Technology, Bielefeld University, 33615 Bielefeld, Germany; (R.C.F.); (J.T.); (K.E.T.); (M.T.R.)
| | - Marco T. Radukic
- Cellular and Molecular Biotechnology, Faculty of Technology, Bielefeld University, 33615 Bielefeld, Germany; (R.C.F.); (J.T.); (K.E.T.); (M.T.R.)
| | - Tobias Baumann
- Biocatalysis group, Department of Chemistry, Technische Universität Berlin, 10623 Berlin, Germany;
| | | | - Yvonne Hannappel
- Physical and Biophysical Chemistry (PCIII), Department of Chemistry, Bielefeld University, 33615 Bielefeld, Germany;
| | - Niklas Biere
- Experimental Biophysics and Applied Nanoscience, Physics Department, Bielefeld University, 33615 Bielefeld, Germany; (N.B.); (D.A.)
| | - Dario Anselmetti
- Experimental Biophysics and Applied Nanoscience, Physics Department, Bielefeld University, 33615 Bielefeld, Germany; (N.B.); (D.A.)
| | - Katja M. Arndt
- Molecular Biotechnology, Institute for Biochemistry and Biology, University of Potsdam, 14476 Potsdam, Germany;
| | - Kristian M. Müller
- Cellular and Molecular Biotechnology, Faculty of Technology, Bielefeld University, 33615 Bielefeld, Germany; (R.C.F.); (J.T.); (K.E.T.); (M.T.R.)
- Correspondence: ; Tel.: +49-521-106-6323
| |
Collapse
|
7
|
Biere N, Ghaffar M, Doebbe A, Jäger D, Rothe N, Friedrich BM, Hofestädt R, Schreiber F, Kruse O, Sommer B. Heuristic Modeling and 3D Stereoscopic Visualization of a Chlamydomonas reinhardtii Cell. J Integr Bioinform 2018; 15:/j/jib.2018.15.issue-2/jib-2018-0003/jib-2018-0003.xml. [PMID: 30001212 PMCID: PMC6167046 DOI: 10.1515/jib-2018-0003] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2018] [Accepted: 05/29/2018] [Indexed: 11/15/2022] Open
Abstract
The structural modeling and representation of cells is a complex task as different microscopic, spectroscopic and other information resources have to be combined to achieve a three-dimensional representation with high accuracy. Moreover, to provide an appropriate spatial representation of the cell, a stereoscopic 3D (S3D) visualization is favorable. In this work, a structural cell model is created by combining information from various light microscopic and electron microscopic images as well as from publication-related data. At the mesoscopic level each cell component is presented with special structural and visual properties; at the molecular level a cell membrane composition and the underlying modeling method are discussed; and structural information is correlated with those at the functional level (represented by simplified energy-producing metabolic pathways). The organism used as an example is the unicellular Chlamydomonas reinhardtii, which might be important in future alternative energy production processes. Based on the 3D model, an educative S3D animation was created which was shown at conferences. The complete workflow was accomplished by using the open source 3D modeling software Blender. The discussed project including the animation is available from: http://Cm5.CELLmicrocosmos.org.
Collapse
Affiliation(s)
- Niklas Biere
- Experimental Biophysics and Applied Nanoscience, Faculty of Physics, Bielefeld University, Bielefeld, Germany
| | - Mehmood Ghaffar
- Bio-/Medical Informatics Department, Faculty of Technology, Bielefeld University, Bielefeld, Germany
| | - Anja Doebbe
- Algae Biotechnology and Bioenergy, Faculty of Biology, Bielefeld University, Bielefeld, Germany
| | - Daniel Jäger
- Algae Biotechnology and Bioenergy, Faculty of Biology, Bielefeld University, Bielefeld, Germany
| | - Nils Rothe
- Bio-/Medical Informatics Department, Faculty of Technology, Bielefeld University, Bielefeld, Germany
| | - Benjamin M. Friedrich
- Biological Algorithms Group, Center for Advancing Electronics Dresden, Technical University Dresden, Dresden, Germany
| | - Ralf Hofestädt
- Bio-/Medical Informatics Department, Faculty of Technology, Bielefeld University, Bielefeld, Germany
| | - Falk Schreiber
- Computational Life Sciences, Department of Computer and Information Science, University of Konstanz, Konstanz, Germany
- Faculty of Information Technology, Monash University, Melbourne, Australia
| | - Olaf Kruse
- Algae Biotechnology and Bioenergy, Faculty of Biology, Bielefeld University, Bielefeld, Germany
| | - Björn Sommer
- Computational Life Sciences, Department of Computer and Information Science, University of Konstanz, Konstanz, Germany
- Faculty of Information Technology, Monash University, Melbourne, Australia
| |
Collapse
|
8
|
Yang Y, Dementyev P, Biere N, Emmrich D, Stohmann P, Korzetz R, Zhang X, Beyer A, Koch S, Anselmetti D, Gölzhäuser A. Rapid Water Permeation Through Carbon Nanomembranes with Sub-Nanometer Channels. ACS Nano 2018; 12:4695-4701. [PMID: 29741359 DOI: 10.1021/acsnano.8b01266] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The provision of clean water is a global challenge, and membrane filtration is a key technology to address it. Conventional filtration membranes are constrained by a trade-off between permeance and selectivity. Recently, some nanostructured membranes demonstrated the ability to overcome this limitation by utilizing well-defined carbon nanoconduits that allow a coordinated passage of water molecules. The fabrication of these materials is still very challenging, but their performance inspires research toward nanofabricated membranes. This study reports on molecularly thin membranes with sub-nanometer channels that combine high water selectivity with an exceptionally high permeance. Carbon nanomembranes (CNMs) of ∼1.2 nm thickness are fabricated from terphenylthiol (TPT) monolayers. Scanning probe microscopy and transport measurements reveal that TPT CNMs consist of a dense network of sub-nanometer channels that efficiently block the passage of most gases and liquids. However, water passes through with an extremely high permeance of ∼1.1 × 10-4 mol·m-2·s-1·Pa-1, as does helium, but with a ∼ 2500 times lower flux. Assuming all channels in a TPT CNM are active in mass transport, we find a single-channel permeation of ∼66 water molecules·s-1·Pa-1. This suggests that water molecules translocate fast and cooperatively through the sub-nanometer channels, similar to carbon nanotubes and membrane proteins (aquaporins). CNMs are thus scalable two-dimensional sieves that can be utilized toward energy-efficient water purification.
Collapse
|