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Sun H, Yao Z. Conformal order and Poincaré-Klein mapping underlying electrostatics-driven inhomogeneity in tethered membranes. Phys Rev E 2023; 108:025001. [PMID: 37723772 DOI: 10.1103/physreve.108.025001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2023] [Accepted: 07/17/2023] [Indexed: 09/20/2023]
Abstract
Understanding the organization of matter under the long-range electrostatic force is a fundamental problem in multiple fields. In this work, based on the electrically charged tethered membrane model, we reveal regular structures underlying the lowest-energy states of inhomogeneously stretched planar lattices by a combination of numerical simulation and analytical geometric analysis. Specifically we show the conformal order characterized by the preserved bond angle in the lattice deformation and reveal the Poincaré-Klein mapping underlying the electrostatics-driven inhomogeneity. The discovery of the Poincaré-Klein mapping, which connects the Poincaré disk and the Klein disk for the hyperbolic plane, implies the connection of long-range electrostatic force and hyperbolic geometry. We also discuss lattices with patterned charges of opposite signs for modulating in-plane inhomogeneity and even creating 3D shapes, which may have a connection to metamaterials design. This work suggests the geometric analysis as a promising approach for elucidating the organization of matter under the long-range force.
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Affiliation(s)
- Honghui Sun
- School of Physics and Astronomy, and Institute of Natural Sciences, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Zhenwei Yao
- School of Physics and Astronomy, and Institute of Natural Sciences, Shanghai Jiao Tong University, Shanghai 200240, China
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Xiong Q, Stupp SI, Schatz GC. Molecular Insight into the β-Sheet Twist and Related Morphology of Self-Assembled Peptide Amphiphile Ribbons. J Phys Chem Lett 2021; 12:11238-11244. [PMID: 34762436 DOI: 10.1021/acs.jpclett.1c03243] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Self-assembly of high-aspect-ratio filaments containing β-sheets has attracted much attention due to potential use in bioengineering and biomedicine. However, precisely predicting the assembled morphologies remains a grand challenge because of insufficient understanding of the self-assembly process. We employed an atomistic model to study the self-assembly of peptide amphiphiles (PAs) containing valine-glutamic acid (VE) dimeric repeats. By changing of the sequence length, the assembly morphology changes from flat ribbon to left-handed twisted ribbon, implying a relationship between β-sheet twist and strength of interstrand hydrogen bonds. The calculations are used to quantify this relationship including both magnitude and sign of the ribbon twist angle. Interestingly, a change in chirality is observed when we introduce the RGD epitope into the C-terminal of VE repeats, suggesting arginine and glycine's role in suppressing right-handed β-sheet formation. This study provides insight into the relationship between β-sheet twist and self-assembled nanostructures including a possible design rule for PA self-assembly.
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Affiliation(s)
- Qinsi Xiong
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113, United States
| | - Samuel I Stupp
- Department of Chemistry, Center for BioInspired Energy Science, and Department of Biomedical Engineering, Northwestern University, Evanston, Illinois 60208, United States
- Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States
- Department of Medicine, Northwestern University, Chicago, Illinois 60611, United States
- Simpson Querrey Institute for BioNanotechnology, Northwestern University, Chicago, Illinois 60611, United States
| | - George C Schatz
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113, United States
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Affiliation(s)
- Catherine E. Killalea
- School of Chemistry The GSK Carbon Neutral Laboratories for Sustainable Chemistry The University of Nottingham Triumph Road Nottingham NG7 2TU UK
| | - David B. Amabilino
- School of Chemistry The GSK Carbon Neutral Laboratories for Sustainable Chemistry The University of Nottingham Triumph Road Nottingham NG7 2TU UK
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Xing H, Chin SM, Udumula VR, Krishnaiah M, Rodrigues de Almeida N, Huck-Iriart C, Picco AS, Lee SR, Zaldivar G, Jackson KA, Tagliazucchi M, Stupp SI, Conda-Sheridan M. Control of Peptide Amphiphile Supramolecular Nanostructures by Isosteric Replacements. Biomacromolecules 2021; 22:3274-3283. [PMID: 34291897 DOI: 10.1021/acs.biomac.1c00379] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Supramolecular nanostructures with tunable properties can have applications in medicine, pharmacy, and biotechnology. In this work, we show that the self-assembly behavior of peptide amphiphiles (PAs) can be effectively tuned by replacing the carboxylic acids exposed to the aqueous media with isosteres, functionalities that share key physical or chemical properties with another chemical group. Transmission electron microscopy, atomic force microscopy, and small-angle X-ray scattering studies indicated that the nanostructure's morphologies are responsive to the ionization states of the side chains, which are related to their pKa values. Circular dichroism studies revealed the effect of the isosteres on the internal arrangement of the nanostructures. The interactions between diverse surfaces and the nanostructures and the effect of salt concentration and temperature were assessed to further understand the properties of these self-assembled systems. These results indicate that isosteric replacements allow the pH control of supramolecular morphology by manipulating the pKa of the charged groups located on the nanostructure's surface. Theoretical studies were performed to understand the morphological transitions that the nanostructures underwent in response to pH changes, suggesting that the transitions result from alterations in the Coulomb forces between PA molecules. This work provides a strategy for designing biomaterials that can maintain or change behaviors based on the pH differences found within cells and tissues.
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Affiliation(s)
- Huihua Xing
- College of Pharmacy, University of Nebraska Medical Center, Omaha, Nebraska 68105, United States
| | - Stacey M Chin
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Venkata Reddy Udumula
- College of Pharmacy, University of Nebraska Medical Center, Omaha, Nebraska 68105, United States
| | - Maddeboina Krishnaiah
- College of Pharmacy, University of Nebraska Medical Center, Omaha, Nebraska 68105, United States
| | | | - Cristián Huck-Iriart
- Laboratorio de Cristalografía Aplicada, Escuela de Ciencia y Tecnología, Universidad Nacional de General San Martín, B1650 San Martín, Buenos Aires, Argentina
| | - Agustín S Picco
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA) - Universidad Nacional de La Plata (UNLP) - CONICET, 1900, La Plata, Argentina
| | - Sieun Ruth Lee
- Department of Materials Science & Engineering, Northwestern University, Evanston, Illinois 60208, United States
| | - Gervasio Zaldivar
- INQUIMAE-CONICET and DQIAQF, Universidad de Buenos Aires, Facultad de Ciencias, Ciudad Universitaria, C1428 Ciudad de Buenos Aires, Argentina
| | - Kelsey A Jackson
- College of Arts and Sciences, Creighton University, Omaha, Nebraska 68178, United States
| | - Mario Tagliazucchi
- INQUIMAE-CONICET and DQIAQF, Universidad de Buenos Aires, Facultad de Ciencias, Ciudad Universitaria, C1428 Ciudad de Buenos Aires, Argentina
| | - Samuel I Stupp
- Department of Materials Science & Engineering, Chemistry, Biomedical Engineering, Medicine, and Simpson Querrey Institute, Northwestern University, Evanston, Illinois 60208, United States
| | - Martin Conda-Sheridan
- College of Pharmacy, University of Nebraska Medical Center, Omaha, Nebraska 68105, United States
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