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Ketterer P, Ananth AN, Laman Trip DS, Mishra A, Bertosin E, Ganji M, van der Torre J, Onck P, Dietz H, Dekker C. DNA origami scaffold for studying intrinsically disordered proteins of the nuclear pore complex. Nat Commun 2018; 9:902. [PMID: 29500415 PMCID: PMC5834454 DOI: 10.1038/s41467-018-03313-w] [Citation(s) in RCA: 88] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2017] [Accepted: 02/02/2018] [Indexed: 11/09/2022] Open
Abstract
The nuclear pore complex (NPC) is the gatekeeper for nuclear transport in eukaryotic cells. A key component of the NPC is the central shaft lined with intrinsically disordered proteins (IDPs) known as FG-Nups, which control the selective molecular traffic. Here, we present an approach to realize artificial NPC mimics that allows controlling the type and copy number of FG-Nups. We constructed 34 nm-wide 3D DNA origami rings and attached different numbers of NSP1, a model yeast FG-Nup, or NSP1-S, a hydrophilic mutant. Using (cryo) electron microscopy, we find that NSP1 forms denser cohesive networks inside the ring compared to NSP1-S. Consistent with this, the measured ionic conductance is lower for NSP1 than for NSP1-S. Molecular dynamics simulations reveal spatially varying protein densities and conductances in good agreement with the experiments. Our technique provides an experimental platform for deciphering the collective behavior of IDPs with full control of their type and position.
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Affiliation(s)
- Philip Ketterer
- Physik Department and Institute for Advanced Study, Technische Universität München, Am Coulombwall 4a, Garching bei München, D-85748, Germany
| | - Adithya N Ananth
- Department of Bionanoscience, Kavli Institute of Nanoscience, Delft University of Technology, Van der Maasweg 9, 2629 HZ, Delft, The Netherlands
| | - Diederik S Laman Trip
- Department of Bionanoscience, Kavli Institute of Nanoscience, Delft University of Technology, Van der Maasweg 9, 2629 HZ, Delft, The Netherlands
| | - Ankur Mishra
- Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747AG, Groningen, The Netherlands
| | - Eva Bertosin
- Physik Department and Institute for Advanced Study, Technische Universität München, Am Coulombwall 4a, Garching bei München, D-85748, Germany
| | - Mahipal Ganji
- Department of Bionanoscience, Kavli Institute of Nanoscience, Delft University of Technology, Van der Maasweg 9, 2629 HZ, Delft, The Netherlands
| | - Jaco van der Torre
- Department of Bionanoscience, Kavli Institute of Nanoscience, Delft University of Technology, Van der Maasweg 9, 2629 HZ, Delft, The Netherlands
| | - Patrick Onck
- Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747AG, Groningen, The Netherlands
| | - Hendrik Dietz
- Physik Department and Institute for Advanced Study, Technische Universität München, Am Coulombwall 4a, Garching bei München, D-85748, Germany.
| | - Cees Dekker
- Department of Bionanoscience, Kavli Institute of Nanoscience, Delft University of Technology, Van der Maasweg 9, 2629 HZ, Delft, The Netherlands.
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Wagenbauer KF, Engelhardt FAS, Stahl E, Hechtl VK, Stömmer P, Seebacher F, Meregalli L, Ketterer P, Gerling T, Dietz H. How We Make DNA Origami. Chembiochem 2017; 18:1873-1885. [PMID: 28714559 DOI: 10.1002/cbic.201700377] [Citation(s) in RCA: 101] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2017] [Indexed: 12/14/2022]
Abstract
DNA origami has attracted substantial attention since its invention ten years ago, due to the seemingly infinite possibilities that it affords for creating customized nanoscale objects. Although the basic concept of DNA origami is easy to understand, using custom DNA origami in practical applications requires detailed know-how for designing and producing the particles with sufficient quality and for preparing them at appropriate concentrations with the necessary degree of purity in custom environments. Such know-how is not readily available for newcomers to the field, thus slowing down the rate at which new applications outside the field of DNA nanotechnology may emerge. To foster faster progress, we share in this article the experience in making and preparing DNA origami that we have accumulated over recent years. We discuss design solutions for creating advanced structural motifs including corners and various types of hinges that expand the design space for the more rigid multilayer DNA origami and provide guidelines for preventing undesired aggregation and on how to induce specific oligomerization of multiple DNA origami building blocks. In addition, we provide detailed protocols and discuss the expected results for five key methods that allow efficient and damage-free preparation of DNA origami. These methods are agarose-gel purification, filtration through molecular cut-off membranes, PEG precipitation, size-exclusion chromatography, and ultracentrifugation-based sedimentation. The guide for creating advanced design motifs and the detailed protocols with their experimental characterization that we describe here should lower the barrier for researchers to accomplish the full DNA origami production workflow.
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Affiliation(s)
- Klaus F Wagenbauer
- Physics Department and Institute for Advanced Study, Technische Universität München, Am Coulombwall 4a, 85748, Garching, Germany
| | - Floris A S Engelhardt
- Physics Department and Institute for Advanced Study, Technische Universität München, Am Coulombwall 4a, 85748, Garching, Germany
| | - Evi Stahl
- Physics Department and Institute for Advanced Study, Technische Universität München, Am Coulombwall 4a, 85748, Garching, Germany
| | - Vera K Hechtl
- Physics Department and Institute for Advanced Study, Technische Universität München, Am Coulombwall 4a, 85748, Garching, Germany
| | - Pierre Stömmer
- Physics Department and Institute for Advanced Study, Technische Universität München, Am Coulombwall 4a, 85748, Garching, Germany
| | - Fabian Seebacher
- Physics Department and Institute for Advanced Study, Technische Universität München, Am Coulombwall 4a, 85748, Garching, Germany
| | - Letizia Meregalli
- Physics Department and Institute for Advanced Study, Technische Universität München, Am Coulombwall 4a, 85748, Garching, Germany
| | - Philip Ketterer
- Physics Department and Institute for Advanced Study, Technische Universität München, Am Coulombwall 4a, 85748, Garching, Germany
| | - Thomas Gerling
- Physics Department and Institute for Advanced Study, Technische Universität München, Am Coulombwall 4a, 85748, Garching, Germany
| | - Hendrik Dietz
- Physics Department and Institute for Advanced Study, Technische Universität München, Am Coulombwall 4a, 85748, Garching, Germany
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Funke JJ, Ketterer P, Lieleg C, Schunter S, Korber P, Dietz H. Uncovering the Forces between Nucleosomes using a DNA Origami Force Spectrometer. Biophys J 2017. [DOI: 10.1016/j.bpj.2016.11.915] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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Abstract
We establish a DNA origami based tool for quantifying conformational equilibria of biomolecular assemblies as a function of environmental conditions. As first application, we employed the tool to study the salt-induced disassembly of nucleosome core particles. To extract binding constants and energetic penalties, we integrated nucleosomes in the spectrometer such that unwrapping of the nucleosomal template DNA, leading from bent to more extended states was directly coupled to the conformation of the spectrometer. Nucleosome unwrapping was induced by increasing the ionic strength. The corresponding shifts in conformation equilibrium of the spectrometer were followed by direct conformation imaging using negative staining TEM and by FRET read out after gel electrophoretic separation of conformations. We find nucleosome dissociation constants in the picomolar range at low ionic strength (11 mM MgCl2), in the nanomolar range at intermediate ionic strength (11 mM MgCl2 with 0.5-1 M NaCl) and in the micromolar range at larger ionic strength (11 mM MgCl2 with ≥1.5 M NaCl). Integration of up to four nucleosomes stacked side-by-side, as it might occur within chromatin fibers, did not appear to affect the salt-induced unwrapping of nucleosomes. Presumably, such stacking interactions are already effectively screened at the nucleosome unwrapping conditions. Our spectrometer provides a modular platform with a direct read out to study conformational equilibria for targets from small biomolecules up to large macromolecular assemblies.
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Affiliation(s)
| | | | - Corinna Lieleg
- Biomedical Center, Molecular Biology, LMU Munich , 82152 Martinsried near Munich, Germany
| | - Philipp Korber
- Biomedical Center, Molecular Biology, LMU Munich , 82152 Martinsried near Munich, Germany
| | - Hendrik Dietz
- Center for Integrated Protein Science , 81377 Munich, Germany
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Funke JJ, Ketterer P, Lieleg C, Schunter S, Korber P, Dietz H. Uncovering the forces between nucleosomes using DNA origami. Sci Adv 2016; 2:e1600974. [PMID: 28138524 PMCID: PMC5262459 DOI: 10.1126/sciadv.1600974] [Citation(s) in RCA: 138] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2016] [Accepted: 10/21/2016] [Indexed: 05/19/2023]
Abstract
Revealing the energy landscape for nucleosome association may contribute to the understanding of higher-order chromatin structures and their impact on genome regulation. We accomplish this in a direct measurement by integrating two nucleosomes into a DNA origami-based force spectrometer, which enabled subnanometer-resolution measurements of nucleosome-nucleosome distance frequencies via single-particle electron microscopy imaging. From the data, we derived the Boltzmann-weighted distance-dependent energy landscape for nucleosome pair interactions. We find a shallow but long-range (~6 nm) attractive nucleosome pair potential with a minimum of -1.6 kcal/mol close to direct contact distances. The relative nucleosome orientation had little influence, but histone H4 acetylation or removal of histone tails drastically decreased the interaction strength. Because of the weak and shallow pair potential, higher-order nucleosome assemblies will be compliant and experience dynamic shape fluctuations in the absence of additional cofactors. Our results contribute to a more accurate description of chromatin and our force spectrometer provides a powerful tool for the direct and high-resolution study of molecular interactions using imaging techniques.
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Affiliation(s)
- Jonas J. Funke
- Physics Department and Institute for Advanced Study, Technische Universität München, Am Coulombwall 4a, Garching bei München, Germany
| | - Philip Ketterer
- Physics Department and Institute for Advanced Study, Technische Universität München, Am Coulombwall 4a, Garching bei München, Germany
| | - Corinna Lieleg
- Biomedical Center, Molecular Biology, Ludwig-Maximilians-Universität München, Martinsried near Munich, Germany
| | - Sarah Schunter
- Biomedical Center, Molecular Biology, Ludwig-Maximilians-Universität München, Martinsried near Munich, Germany
| | - Philipp Korber
- Biomedical Center, Molecular Biology, Ludwig-Maximilians-Universität München, Martinsried near Munich, Germany
- Corresponding author. (P.K.); (H.D.)
| | - Hendrik Dietz
- Physics Department and Institute for Advanced Study, Technische Universität München, Am Coulombwall 4a, Garching bei München, Germany
- Corresponding author. (P.K.); (H.D.)
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Ketterer P, Willner EM, Dietz H. Nanoscale rotary apparatus formed from tight-fitting 3D DNA components. Sci Adv 2016; 2:e1501209. [PMID: 26989778 PMCID: PMC4788491 DOI: 10.1126/sciadv.1501209] [Citation(s) in RCA: 103] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2015] [Accepted: 12/07/2015] [Indexed: 05/19/2023]
Abstract
We report a nanoscale rotary mechanism that reproduces some of the dynamic properties of biological rotary motors in the absence of an energy source, such as random walks on a circle with dwells at docking sites. Our mechanism is built modularly from tight-fitting components that were self-assembled using multilayer DNA origami. The apparatus has greater structural complexity than previous mechanically interlocked objects and features a well-defined angular degree of freedom without restricting the range of rotation. We studied the dynamics of our mechanism using single-particle experiments analogous to those performed previously with actin-labeled adenosine triphosphate synthases. In our mechanism, rotor mobility, the number of docking sites, and the dwell times at these sites may be controlled through rational design. Our prototype thus realizes a working platform toward creating synthetic nanoscale rotary motors. Our methods will support creating other complex nanoscale mechanisms based on tightly fitting, sterically constrained, but mobile, DNA components.
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Abstract
While understanding translocation of DNA through a solid-state nanopore is vital for exploiting its potential for sensing and sequencing at the single-molecule level, surprisingly little is known about the dynamics of the propagation of DNA through the nanopore. Here we use linear double-stranded DNA molecules, assembled by the DNA origami technique, with markers at known positions in order to determine for the first time the local velocity of different segments along the length of the molecule. We observe large intramolecular velocity fluctuations, likely related to changes in the drag force as the DNA blob unfolds. Furthermore, we observe an increase in the local translocation velocity toward the end of the translocation process, consistent with a speeding up due to unfolding of the last part of the DNA blob. We use the velocity profile to estimate the uncertainty in determining the position of a feature along the DNA given its temporal location and demonstrate the error introduced by assuming a constant translocation velocity.
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Affiliation(s)
- Calin Plesa
- Department of Bionanoscience, Kavli Institute of Nanoscience, Delft University of Technology , Lorentzweg 1, 2628 CJ Delft, The Netherlands
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Rahmig T, Förster HJ, Ketterer P, Huth JH, Finck W, Krüger M. [Methods and quality of information from myocardial scintigrams in the diagnosis of myocardial infarct]. Z Exp Chir 1977; 10:210-15. [PMID: 899099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
There is an increasing importance of scintigraphy for the assessment of microcirculation in the myocardium. In animal experiments advantages and disadvantages of negative and positive representation of ischemic myocardiac areas were tried, after experimental infarction in particular. The results by computer scintigraphy prove that positive representation reveals an information on site and extent of an infarction.
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