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Kostaras C, Patroni D, Spiliopoulos N, Anastassopoulos DL, Vradis A, Toprakcioglu C. Flow through Alumina Nanopores Bearing Responsive Polymer Brushes. Macromolecules 2022. [DOI: 10.1021/acs.macromol.2c00283] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | - Dimitra Patroni
- Department of Physics, University of Patras, Patras 26504, Greece
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2
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Chen G, Dormidontova E. PEO-Grafted Gold Nanopore: Grafting Density, Chain Length, and Curvature Effects. Macromolecules 2022. [DOI: 10.1021/acs.macromol.2c00323] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Guang Chen
- Polymer Program, Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Elena Dormidontova
- Polymer Program, Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, United States
- Department of Physics, University of Connecticut, Storrs, Connecticut 06269, United States
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A designer FG-Nup that reconstitutes the selective transport barrier of the nuclear pore complex. Nat Commun 2021; 12:2010. [PMID: 33790297 PMCID: PMC8012357 DOI: 10.1038/s41467-021-22293-y] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2019] [Accepted: 03/01/2021] [Indexed: 02/01/2023] Open
Abstract
Nuclear Pore Complexes (NPCs) regulate bidirectional transport between the nucleus and the cytoplasm. Intrinsically disordered FG-Nups line the NPC lumen and form a selective barrier, where transport of most proteins is inhibited whereas specific transporter proteins freely pass. The mechanism underlying selective transport through the NPC is still debated. Here, we reconstitute the selective behaviour of the NPC bottom-up by introducing a rationally designed artificial FG-Nup that mimics natural Nups. Using QCM-D, we measure selective binding of the artificial FG-Nup brushes to the transport receptor Kap95 over cytosolic proteins such as BSA. Solid-state nanopores with the artificial FG-Nups lining their inner walls support fast translocation of Kap95 while blocking BSA, thus demonstrating selectivity. Coarse-grained molecular dynamics simulations highlight the formation of a selective meshwork with densities comparable to native NPCs. Our findings show that simple design rules can recapitulate the selective behaviour of native FG-Nups and demonstrate that no specific spacer sequence nor a spatial segregation of different FG-motif types are needed to create selective NPCs.
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Allahyarov E, Löwen H, Taylor PL. Simulation Study of Ion Diffusion in Charged Nanopores with Anchored Terminal Groups. Electrochim Acta 2017. [DOI: 10.1016/j.electacta.2017.04.158] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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5
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Chen C, Tang P, Qiu F. Binary hairy nanoparticles: Recent progress in theory and simulations. ACTA ACUST UNITED AC 2014. [DOI: 10.1002/polb.23528] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Cangyi Chen
- Department of Macromolecular Science; State Key Laboratory of Molecular Engineering of Polymers, Fudan University; Shanghai 200433 China
| | - Ping Tang
- Department of Macromolecular Science; State Key Laboratory of Molecular Engineering of Polymers, Fudan University; Shanghai 200433 China
| | - Feng Qiu
- Department of Macromolecular Science; State Key Laboratory of Molecular Engineering of Polymers, Fudan University; Shanghai 200433 China
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Controlling the thickness of electrochemically produced porous alumina membranes: the role of the current density during the anodization. J APPL ELECTROCHEM 2014. [DOI: 10.1007/s10800-014-0680-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Osmanović D, Fassati A, Ford IJ, Hoogenboom BW. Physical modelling of the nuclear pore complex. SOFT MATTER 2013; 9:10442. [PMCID: PMC4046875 DOI: 10.1039/c3sm50722j] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2013] [Accepted: 07/18/2013] [Indexed: 05/24/2023]
Abstract
An in-depth discussion of nuclear pore complexes illustrates the importance of macromolecular confinement in biological systems.
Physically interesting behaviour can arise when soft matter is confined to nanoscale dimensions. A highly relevant biological example of such a phenomenon is the Nuclear Pore Complex (NPC) found perforating the nuclear envelope of eukaryotic cells. In the central conduit of the NPC, of ∼30–60 nm diameter, a disordered network of proteins regulates all macromolecular transport between the nucleus and the cytoplasm. In spite of a wealth of experimental data, the selectivity barrier of the NPC has yet to be explained fully. Experimental and theoretical approaches are complicated by the disordered and heterogeneous nature of the NPC conduit. Modelling approaches have focused on the behaviour of the partially unfolded protein domains in the confined geometry of the NPC conduit, and have demonstrated that within the range of parameters thought relevant for the NPC, widely varying behaviour can be observed. In this review, we summarise recent efforts to physically model the NPC barrier and function. We illustrate how attempts to understand NPC barrier function have employed many different modelling techniques, each of which have contributed to our understanding of the NPC.
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Affiliation(s)
- Dino Osmanović
- London Centre for Nanotechnology and Department of Physics and Astronomy , University College London , Gower Street , WC1E 6BT , UK .
| | - Ariberto Fassati
- Wohl Virion Centre and MRC Centre for Medical Molecular Virology , University College London , Gower Street , WC1E 6BT , UK
| | - Ian J. Ford
- London Centre for Nanotechnology and Department of Physics and Astronomy , University College London , Gower Street , WC1E 6BT , UK .
| | - Bart W. Hoogenboom
- London Centre for Nanotechnology and Department of Physics and Astronomy , University College London , Gower Street , WC1E 6BT , UK .
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Yang H, Chen XC, Jun GR, Green PF. Segmental Dynamics of Chains Tethered at Interfaces of Varying Curvatures. Macromolecules 2013. [DOI: 10.1021/ma400098u] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Hengxi Yang
- Department
of Physics, The University of Michigan,
Ann Arbor, Michigan 48109,
United States
| | - X. Chelsea Chen
- Department
of Materials Science
and Engineering, The University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Ga Ram Jun
- Department
of Materials Science
and Engineering, The University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Peter F. Green
- Department
of Materials Science
and Engineering, The University of Michigan, Ann Arbor, Michigan 48109, United States
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Suo T, Shendruk TN, Hickey OA, Slater GW, Whitmore MD. Controlling Grafted Polymers inside Cylindrical Tubes. Macromolecules 2013. [DOI: 10.1021/ma302302t] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Tongchuan Suo
- Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba R3T 2N2,
Canada
| | - Tyler N. Shendruk
- Department of Physics, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
| | - Owen A. Hickey
- Department of Physics, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
| | - Gary W. Slater
- Department of Physics, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
| | - Mark D. Whitmore
- Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba R3T 2N2,
Canada
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Binder K, Milchev A. Polymer brushes on flat and curved surfaces: How computer simulations can help to test theories and to interpret experiments. ACTA ACUST UNITED AC 2012. [DOI: 10.1002/polb.23168] [Citation(s) in RCA: 166] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Osmanovic D, Bailey J, Harker AH, Fassati A, Hoogenboom BW, Ford IJ. Bistable collective behavior of polymers tethered in a nanopore. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2012; 85:061917. [PMID: 23005137 DOI: 10.1103/physreve.85.061917] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2011] [Indexed: 05/07/2023]
Abstract
Polymer-coated pores play a crucial role in nucleo-cytoplasmic transport and in a number of biomimetic and nanotechnological applications. Here we present Monte Carlo and Density Functional Theory approaches to identify different collective phases of end-grafted polymers in a nanopore and to study their relative stability as a function of intermolecular interactions. Over a range of system parameters that is relevant for nuclear pore complexes, we observe two distinct phases: one with the bulk of the polymers condensed at the wall of the pore, and the other with the polymers condensed along its central axis. The relative stability of these two phases depends on the interpolymer interactions. The existence the two phases suggests a mechanism in which marginal changes in these interactions, possibly induced by nuclear transport receptors, cause the pore to transform between open and closed configurations, which will influence transport through the pore.
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Affiliation(s)
- Dino Osmanovic
- London Centre for Nanotechnology, Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom.
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Wang R, Egorov SA, Milchev A, Binder K. Stretching of Free Chains Confined in Concave Brush-Coated Nanocylinders. Macromolecules 2012. [DOI: 10.1021/ma202620z] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Rong Wang
- Institut für Physik, Johannes Gutenberg-Universität Mainz, Staudinger
Weg 7, D-55099 Mainz, Germany
- Department of Polymer Science
and Engineering, State Key Laboratory of Coordination Chemistry, Nanjing
National Laboratory of Microstructures, School of Chemistry and Chemical
Engineering, Nanjing University, Nanjing
210093, China
| | - Sergei A. Egorov
- Institut für Physik, Johannes Gutenberg-Universität Mainz, Staudinger
Weg 7, D-55099 Mainz, Germany
- Department
of Chemistry, University of Virginia, Charlottesville,
Virginia 22901,
United States
| | - Andrey Milchev
- Institut für Physik, Johannes Gutenberg-Universität Mainz, Staudinger
Weg 7, D-55099 Mainz, Germany
- Institute
of Physical Chemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
| | - Kurt Binder
- Institut für Physik, Johannes Gutenberg-Universität Mainz, Staudinger
Weg 7, D-55099 Mainz, Germany
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Peleg O, Tagliazucchi M, Kröger M, Rabin Y, Szleifer I. Morphology control of hairy nanopores. ACS NANO 2011; 5:4737-4747. [PMID: 21524134 DOI: 10.1021/nn200702u] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The properties of polymer layers end-grafted to the inner surface of nanopores connected to solvent reservoirs are studied theoretically as a function of solvent quality and pore geometry. Our systematic study reveals that nanoconfinement is affected by both pore radius and length and that the conformations of the polymer chains strongly depend on their grafting position along the nanopore and on the quality of the solvent. In poor solvent, polymer chains can collapse to the walls, form a compact plug in the pore, or self-assemble into domains of different shape due to microphase separation. The morphology of these domains (aggregates on pore walls or stacked micelles along the pore axis) is mainly determined by the relationship between chain length and pore radius. In other cases the number of aggregates depends on pore length. The presence of reservoirs decreases confinement at pore edges due to the changes in available volume and introduces new organization strategies not available for infinite nanochannels. In good solvent conditions, chains grafted at the pore entrances stretch out of the pore, relieving the internal osmotic pressure and increasing the entropy of the polymers. Our study also addresses the experimentally relevant case of end-grafted chains on the outer walls of the membrane surrounding the nanopore. The effect of these polymer chains on the organization within the nanopore depends on solvent quality. For good solvents the outer chains increase the confinement of the chains at the entrance of the pore; however, the effect does not result in new structures. For poor solvents the presence of the outer polymer layer may lead to changes in the morphology of the microphase-separated domains. Our results show the complex interplay between the different interactions in a confined environment and the need to develop theoretical and experimental tools for their study.
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Affiliation(s)
- Orit Peleg
- Polymer Physics, Department of Materials, ETH Zurich, Wolfgang-Pauli-Strasse 10, CH-8093 Zurich, Switzerland
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Borówko M, Patrykiejew A, Rżysko W, Sokołowski S, Ilnytskyi J. Complex phase behavior of a fluid in slits with semipermeable walls modified with tethered chains. J Chem Phys 2011; 134:044705. [DOI: 10.1063/1.3530791] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
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15
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Karagiovanaki S, Koutsioubas A, Spiliopoulos N, Anastassopoulos DL, Vradis AA, Toprakcioglu C, Siokou AE. Adsorption of block copolymers in nanoporous alumina. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/polb.21972] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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