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Arad E, Levi T, Yosefi G, Kass I, Cohen-Erez I, Azoulay Z, Bitton R, Jelinek R, Rapaport H. A Matter of Charge: Electrostatically Tuned Coassembly of Amphiphilic Peptides. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024:e2404324. [PMID: 39155426 DOI: 10.1002/smll.202404324] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2024] [Revised: 08/04/2024] [Indexed: 08/20/2024]
Abstract
Coassembly of peptide biomaterials offers a compelling avenue to broaden the spectrum of hierarchically ordered supramolecular nanoscale structures that may be relevant for biomedical and biotechnological applications. In this work coassemblies of amphiphilic and oppositely charged, anionic and cationic, β-sheet peptides are studied, which may give rise to a diverse range of coassembled forms. Mixtures of the peptides show significantly lower critical coassembly concentration (CCC) values compared to those of the individual pure peptides. Intriguingly, the highest formation of coassembled fibrils is found to require excess of the cationic peptide whereas equimolar mixtures of the peptides exhibited the maximum folding into β-sheet structures. Mixtures of the peptides coassembled sequentially from solutions at concentrations surpassing each peptide's intrinsic critical assembly concentration (CAC), are also found to require a higher portion of the cationic peptide to stabilize hydrogels. This study illuminates a systematic investigation of oppositely charged β-sheet peptides over a range of concentrations, in solutions and in hydrogels. The results may be relevant to the fundamental understanding of such intricate charge-driven assembly systems and to the formulation of peptide-based nanostructures with diverse functionalities.
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Affiliation(s)
- Elad Arad
- Ilse Katz Institute (IKI) for Nanoscale Science and Technology, Ben-Gurion University of the Negev, Beer-Sheva, 8410501, Israel
- Department of Chemistry, Ben-Gurion University of the Negev, Beer-Sheva, 8410501, Israel
- Department of Chemical Engineering, Columbia University in the City of New York, New York, NY, 10027, USA
| | - Topaz Levi
- Avram and Stella Goldstein-Goren Department of Biotechnology Engineering, Ben Gurion University of the Negev, Beer Sheva, 8410501, Israel
| | - Gal Yosefi
- Department of Chemical Engineering, Ben-Gurion University of the Negev, Beer-Sheva, 8410501, Israel
| | - Itamar Kass
- Ilse Katz Institute (IKI) for Nanoscale Science and Technology, Ben-Gurion University of the Negev, Beer-Sheva, 8410501, Israel
| | - Ifat Cohen-Erez
- Avram and Stella Goldstein-Goren Department of Biotechnology Engineering, Ben Gurion University of the Negev, Beer Sheva, 8410501, Israel
| | - Ziv Azoulay
- Avram and Stella Goldstein-Goren Department of Biotechnology Engineering, Ben Gurion University of the Negev, Beer Sheva, 8410501, Israel
| | - Ronit Bitton
- Ilse Katz Institute (IKI) for Nanoscale Science and Technology, Ben-Gurion University of the Negev, Beer-Sheva, 8410501, Israel
- Department of Chemical Engineering, Ben-Gurion University of the Negev, Beer-Sheva, 8410501, Israel
| | - Raz Jelinek
- Ilse Katz Institute (IKI) for Nanoscale Science and Technology, Ben-Gurion University of the Negev, Beer-Sheva, 8410501, Israel
- Department of Chemistry, Ben-Gurion University of the Negev, Beer-Sheva, 8410501, Israel
| | - Hanna Rapaport
- Ilse Katz Institute (IKI) for Nanoscale Science and Technology, Ben-Gurion University of the Negev, Beer-Sheva, 8410501, Israel
- Avram and Stella Goldstein-Goren Department of Biotechnology Engineering, Ben Gurion University of the Negev, Beer Sheva, 8410501, Israel
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2
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Yosefi G, Kass I, Rapaport H, Bitton R. Decoupling Charge and Side Chain Effects in Hierarchical Organization of Cationic PFX Peptide and Alginate. Biomacromolecules 2024; 25:4168-4176. [PMID: 38902961 DOI: 10.1021/acs.biomac.4c00278] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/22/2024]
Abstract
We have successfully created self-assembled membranes by combining positively charged (Pro-X-(Phe-X)5-Pro) PFX peptides with negatively charged alginate. These PFX/alginate membranes were formed by three different peptides that contain either X = Arginine (R), Histidine (H), or Ornithine (O) as their charged amino acid. The assemblies were compared to membranes that were previously reported by us composed of X = lysine (K). This study enabled us to elucidate the impact of amino acids' specific interactions on membrane formation. SEM, SAXS, and cryo-TEM measurements show that although K, R, H, and O may have a similar net charge, the specific traits of the charged amino acid is an essential factor in determining the hierarchical structure of alginate/PFX self-assembled membranes.
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Affiliation(s)
- Gal Yosefi
- Department of Chemical Engineering, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
| | - Itamar Kass
- Ilse Katz Institute for Nanoscale Science and Technology (IKI), Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
| | - Hanna Rapaport
- Avram and Stella Goldstein-Goren Department of Biotechnology Engineering, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
- Ilse Katz Institute for Nanoscale Science and Technology (IKI), Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
| | - Ronit Bitton
- Department of Chemical Engineering, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
- Ilse Katz Institute for Nanoscale Science and Technology (IKI), Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
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3
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The rheological properties of beta amyloid Langmuir monolayers: Comparative studies with melittin peptide. Colloids Surf B Biointerfaces 2016; 146:180-7. [DOI: 10.1016/j.colsurfb.2016.06.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2016] [Revised: 05/24/2016] [Accepted: 06/01/2016] [Indexed: 11/22/2022]
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Diggins P, McDargh ZA, Deserno M. Curvature Softening and Negative Compressibility of Gel-Phase Lipid Membranes. J Am Chem Soc 2015; 137:12752-5. [PMID: 26413857 DOI: 10.1021/jacs.5b06800] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We show that gel-phase lipid membranes soften upon bending, leading to curvature localization and a negative compressibility. Using simulations of two very different lipid models to quantify shape and stress-strain relation of buckled membranes, we demonstrate that gel phase bilayers do not behave like Euler elastica and hence are not well described by a quadratic Helfrich Hamiltonian, much unlike their fluid-phase counterparts. We propose a theoretical framework which accounts for the observed softening through an energy density that smoothly crosses over from a quadratic to a linear curvature dependence beyond a critical new scale [Formula: see text](-1). This model captures both the shape and the stress-strain relation for our two sets of simulations and permits the extraction of bending moduli, which are found to be about an order of magnitude larger than the corresponding fluid phase values. We also find surprisingly large crossover lengths [Formula: see text], several times bigger than the bilayer thickness, rendering the exotic elasticity of gel-phase membranes more strongly pronounced than that of homogeneous compressible sheets and artificial metamaterials. We suggest that such membranes have unexpected potential as nanoscale systems with striking materials characteristics.
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Affiliation(s)
- Patrick Diggins
- Department of Physics, Carnegie Mellon University , Pittsburgh, Pennsylvania 15213, United States
| | - Zachary A McDargh
- Department of Physics, Carnegie Mellon University , Pittsburgh, Pennsylvania 15213, United States
| | - Markus Deserno
- Department of Physics, Carnegie Mellon University , Pittsburgh, Pennsylvania 15213, United States
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Shlomo Z, Vinod TP, Jelinek R, Rapaport H. Stacking interactions by two Phe side chains stabilize and orient assemblies of even the minimal amphiphilic β-sheet motif. Chem Commun (Camb) 2015; 51:3154-7. [DOI: 10.1039/c4cc09673h] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Here we demonstrate that the smallest possible motif of the amphiphilic and pleated β-strand structure can be generated using tri-peptides stabilized by π–π stacking interactions.
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Affiliation(s)
- Zarzhitsky Shlomo
- Avram and Stella Goldstein-Goren Department of Biotechnology Engineering
- Ben-Gurion University of the Negev
- Beer-Sheva 84105
- Israel
- Ilse Katz Institute for Nanoscale Science and Technology
| | - T. P. Vinod
- Ilse Katz Institute for Nanoscale Science and Technology
- Ben-Gurion University of the Negev
- Beer-Sheva 84105
- Israel
- Department of Chemistry
| | - Raz Jelinek
- Ilse Katz Institute for Nanoscale Science and Technology
- Ben-Gurion University of the Negev
- Beer-Sheva 84105
- Israel
- Department of Chemistry
| | - Hanna Rapaport
- Avram and Stella Goldstein-Goren Department of Biotechnology Engineering
- Ben-Gurion University of the Negev
- Beer-Sheva 84105
- Israel
- Ilse Katz Institute for Nanoscale Science and Technology
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7
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Gong H, Yang Y, Pluntke M, Marti O, Majer Z, Sewald N, Volkmer D. Calcium carbonate crystal growth beneath Langmuir monolayers of acidic β-hairpin peptides. Dalton Trans 2014; 43:16857-71. [PMID: 25292256 DOI: 10.1039/c4dt01154f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Four amphiphilic peptides with designed hairpin structure were synthesized and their monolayers were employed as model systems to study biologically inspired calcium carbonate crystallization. Langmuir monolayers of hairpin peptides were investigated by surface pressure area isotherms, surface potential isotherms, Brewster angle microscopy (BAM), atomic force microscopy (AFM) and Fourier transform infrared (FTIR) spectroscopy. A β-hairpin conformation was found for all peptides at the air-water interface although their packing arrangements seem to be different. Crystallization of calcium carbonate under these peptide monolayers was investigated at different surface pressures and growth times both by in situ optical microscopy, BAM and ex situ investigations such as scanning electron microscopy (SEM) and transmission electron microscopy (TEM). An amorphous calcium carbonate precursor was found at the initial crystallization stage. The crystallization process occurred in three stages. It starts from the nucleation of amorphous particles being a kinetically controlled process. Crystal nuclei subsequently aggregate to large particles and vaterite crystals start to form inside the amorphous layer, with the monolayer fluidity exerting an important role. The third process includes the re-crystallization of vaterite to calcite, which is thermodynamically controlled by monolayer structural factors including the monolayer flexibility and packing arrangement of the polar headgroups. Thus, the kinetic factors, monolayer fluidity and flexibility as well as structure factors govern the crystal morphology and polymorph distribution simultaneously and synergistically.
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Affiliation(s)
- Haofei Gong
- Institute of Physics, Chair of Solid State and Materials Chemistry, Augsburg University, Universitätsstrasse 1, D-86159 Augsburg, Germany.
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8
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Zarzhitsky S, Edri H, Azoulay Z, Cohen I, Ventura Y, Gitelman A, Rapaport H. The effect of pH and calcium ions on the stability of amphiphilic and anionicβ-sheet peptide hydrogels. Biopolymers 2013; 100:760-72. [DOI: 10.1002/bip.22282] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2013] [Revised: 03/20/2013] [Accepted: 04/08/2013] [Indexed: 11/07/2022]
Affiliation(s)
- Shlomo Zarzhitsky
- Avram and Stella Goldstein-Goren Department of Biotechnology Engineering; Ben-Gurion University of the Negev; Beer-Sheva 84105 Israel
- Ilse Katz Institute for Nano-Science and Technology (IKI); Ben-Gurion University of the Negev; Beer-Sheva 84105 Israel
| | - Hodaya Edri
- Avram and Stella Goldstein-Goren Department of Biotechnology Engineering; Ben-Gurion University of the Negev; Beer-Sheva 84105 Israel
| | - Ziv Azoulay
- Avram and Stella Goldstein-Goren Department of Biotechnology Engineering; Ben-Gurion University of the Negev; Beer-Sheva 84105 Israel
| | - Ifat Cohen
- Avram and Stella Goldstein-Goren Department of Biotechnology Engineering; Ben-Gurion University of the Negev; Beer-Sheva 84105 Israel
| | - Yvonne Ventura
- Avram and Stella Goldstein-Goren Department of Biotechnology Engineering; Ben-Gurion University of the Negev; Beer-Sheva 84105 Israel
| | - Anna Gitelman
- Avram and Stella Goldstein-Goren Department of Biotechnology Engineering; Ben-Gurion University of the Negev; Beer-Sheva 84105 Israel
| | - Hanna Rapaport
- Avram and Stella Goldstein-Goren Department of Biotechnology Engineering; Ben-Gurion University of the Negev; Beer-Sheva 84105 Israel
- Ilse Katz Institute for Nano-Science and Technology (IKI); Ben-Gurion University of the Negev; Beer-Sheva 84105 Israel
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Yaakobi K, Liebes-Peer Y, Kushmaro A, Rapaport H. Designed amphiphilic β-sheet peptides as templates for paraoxon adsorption and detection. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:6840-6848. [PMID: 23631528 DOI: 10.1021/la401280e] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Amphiphilic peptides were designed to fold into a β-sheet monolayer structure while presenting the catalytic triad residues of the enzyme, acetylcholinesterase (Glu, His, and Ser), to a solution containing the organophosphate, paraoxon. Three peptides, in which the catalytic triad residues were arranged in different orders along the strand, were generated to reveal potential differences in interactions with paraoxon as a function of the order of these amino acids. One additional peptide with amino acids introduced in random order was studied to highlight the contribution of the β-sheet secondary structure to any interactions with paraoxon. Langmuir isotherms, Brewster angle microscope at interfaces, and circular dichroism measurements in bulk showed that both the β-sheet conformation and the order of the amino acids along the strand influenced the interactions of paraoxon with the peptides. Compression isotherm curves as well as Brewster angle microscopy images provided evidence for enhanced adsorption of the paraoxon to the monolayers of peptides, which present neighboring Glu and Ser residues along the hydrophilic face of the β-strand. Circular dichroism revealed that the peptide most sensitive to interactions with paraoxon was that with the triad residues in the order Glu, Ser, and His, which appears to be appropriate for supporting a catalytic mechanism similar to that in the acetylcholinesterase enzyme. These rationally designed peptides may be further used for the development of technologies for organophosphate adsorption and detection.
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Affiliation(s)
- Keren Yaakobi
- Unit of Environmental Engineering, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel
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10
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Segman-Magidovich S, Rapaport H. The Effects of Template Rigidity and Amino Acid Type on Heterogeneous Calcium-Phosphate Mineralization by Langmuir Films of Amphiphilic and Acidic β-Sheet Peptides. J Phys Chem B 2012; 116:11197-204. [DOI: 10.1021/jp305386e] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Shlomit Segman-Magidovich
- The Avram and Stella Goldstein-Goren
Department of Biotechnology Engineering and the Ilse Katz Institute
for Nanoscale Science and Technology, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
| | - Hanna Rapaport
- The Avram and Stella Goldstein-Goren
Department of Biotechnology Engineering and the Ilse Katz Institute
for Nanoscale Science and Technology, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
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11
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Segman-Magidovich S, Lee MR, Vaiser V, Struth B, Gellman SH, Rapaport H. Sheet-Like Assemblies of Charged Amphiphilic α/β-Peptides at the Air-Water Interface. Chemistry 2011; 17:14857-66. [DOI: 10.1002/chem.201101775] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2011] [Indexed: 11/10/2022]
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12
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Vaiser V, Rapaport H. Compressibility and Elasticity of Amphiphilic and Acidic β-Sheet Peptides at the Air−Water Interface. J Phys Chem B 2010; 115:50-6. [DOI: 10.1021/jp108496f] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Vladimir Vaiser
- Avram and Stella Goldstein-Goren Department of Biotechnology Engineering and the Ilze Katz Institute for Nanoscale Technology, Ben-Gurion University of the Negev, P.O. Box 653, Beer-Sheva 84105, Israel
| | - Hanna Rapaport
- Avram and Stella Goldstein-Goren Department of Biotechnology Engineering and the Ilze Katz Institute for Nanoscale Technology, Ben-Gurion University of the Negev, P.O. Box 653, Beer-Sheva 84105, Israel
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13
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Steiner Z, Rapaport H, Oren Y, Kasher R. Effect of surface-exposed chemical groups on calcium-phosphate mineralization in water-treatment systems. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2010; 44:7937-7943. [PMID: 20873736 DOI: 10.1021/es101773t] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Calcium-phosphate-scale formation on reverse osmosis (RO) membranes is a major limiting factor for cost-effective desalination of wastewater. We determined the effects of various organic chemical groups found on membrane surfaces on calcium-phosphate scaling. Langmuir films exposing different functional groups were equilibrated with a solution simulating the ionic profile of secondary effluent (SSE). Surface pressure-area (Langmuir) isotherms combined with ICP elemental analyses of the interfacial precipitate suggested acceleration of calcium-phosphate mineralization by the surface functional groups in the order: PO(4) > COOH ∼ NH(2) > COOH:NH(2) (1:1) > OH > ethylene glycol. Immersion of gold-coated silicon wafers self-assembled with different alkanethiols in SSE solution showed formation of a hydroxyapatite precipitate by X-ray diffraction and ATR-IR analysis. Data showed diverse influences of functional groups on mineralization, implying low calcium-phosphate scaling for uncharged surfaces or surfaces coated with both positively and negatively charged groups. This information is valuable for understanding scaling processes, and for designing of novel low-scaling membranes for water desalination.
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Affiliation(s)
- Zvi Steiner
- Department of Desalination and Water Treatment, Zuckerberg Institute for Water Research, Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boqer campus 84990, Israel
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14
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Tong JP, Sun XJ, Tao J, Huang RB, Zheng LS. In Situ C−C Coupling and Formation of a Heptanuclear Copper(II) Cluster. Inorg Chem 2010; 49:1289-91. [DOI: 10.1021/ic902205x] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jia-Ping Tong
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, People's Republic of China
| | - Xiao-Jun Sun
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, People's Republic of China
| | - Jun Tao
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, People's Republic of China
| | - Rong-Bin Huang
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, People's Republic of China
| | - Lan-Sun Zheng
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, People's Republic of China
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Rajagopal K, Lamm MS, Haines-Butterick LA, Pochan DJ, Schneider JP. Tuning the pH responsiveness of beta-hairpin peptide folding, self-assembly, and hydrogel material formation. Biomacromolecules 2009; 10:2619-25. [PMID: 19663418 DOI: 10.1021/bm900544e] [Citation(s) in RCA: 147] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
A design strategy to control the thermally triggered folding, self-assembly, and subsequent hydrogelation of amphiphilic beta-hairpin peptides in a pH-dependent manner is presented. Point substitutions of the lysine residues of the self-assembling peptide MAX1 were made to alter the net charge of the peptide. In turn, the electrostatic nature of the peptide directly influences the solution pH at which thermally triggered hydrogelation is permitted. CD spectroscopy and oscillatory rheology show that peptides of lower net positive charge are capable of folding and assembling into hydrogel material at lower values of pH at a given temperature. The pH sensitive folding and assembling behavior is not only dependent on the net peptide charge, but also on the exact position of substitution within the peptide sequence. TEM shows that these peptides self-assemble into hydrogels that are composed of well-defined fibrils with nonlaminated morphologies. TEM also indicates that fibril morphology is not influenced by making these sequence changes on the hydrophilic face of the hairpins. Rheology shows that the ultimate mechanical rigidity of these peptide hydrogels is dependent on the rate of folding and self-assembly. Peptides that fold and assemble faster afford more rigid gels. Ultimately, this design strategy yielded a peptide MAX1(K15E) that is capable of undergoing thermally triggered hydrogelation at physiological buffer conditions (pH 7.4, 150 NaCl, 37 degrees C).
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Affiliation(s)
- Karthikan Rajagopal
- Department of Chemistry and Biochemistry, University of Delaware, Newark Delaware 19716, USA
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Segman S, Lee MR, Vaiser V, Gellman S, Rapaport H. Highly Stable Pleated-Sheet Secondary Structure in Assemblies of Amphiphilic α/β-Peptides at the Air-Water Interface. Angew Chem Int Ed Engl 2009; 49:716-9. [DOI: 10.1002/anie.200904566] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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17
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Segman S, Lee MR, Vaiser V, Gellman S, Rapaport H. Highly Stable Pleated-Sheet Secondary Structure in Assemblies of Amphiphilic α/β-Peptides at the Air-Water Interface. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200904566] [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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18
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Rubinov B, Wagner N, Rapaport H, Ashkenasy G. Self-replicating amphiphilic beta-sheet peptides. Angew Chem Int Ed Engl 2009; 48:6683-6. [PMID: 19644990 DOI: 10.1002/anie.200902790] [Citation(s) in RCA: 125] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Boris Rubinov
- Department of Chemistry, Ben Gurion University of the Negev, Beer Sheva, 84105, Israel
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Rubinov B, Wagner N, Rapaport H, Ashkenasy G. Self-Replicating Amphiphilic β-Sheet Peptides. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200902790] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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20
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Wang L, Martin DDO, Genter E, Wang J, McLeod RS, Small DM. Surface study of apoB1694-1880, a sequence that can anchor apoB to lipoproteins and make it nonexchangeable. J Lipid Res 2009; 50:1340-52. [PMID: 19251580 DOI: 10.1194/jlr.m900040-jlr200] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Apolipoprotein B (apoB) is a nonexchangeable apolipoprotein. During lipoprotein assembly, it recruits phospholipids and triacylglycerols (TAG) into TAG-rich lipoprotein particles. It remains bound to secreted lipoproteins during lipid metabolism in plasma. The beta1 region (residues 827-1880) of apoB has a high amphipathic beta strand (AbetaS) content and is proposed to be one region anchoring apoB to lipoproteins. The AbetaS-rich region between apoB37 and apoB41 (residues 1694-1880) was cloned, expressed, and purified. The interfacial properties were studied at the triolein/water (TO/W) and air/water (A/W) interfaces. ApoB[37-41] is surface-active and adsorbs to the TO/W interface. After adsorption the unbound apoB[37-41] was removed from the aqueous phase. Adsorbed apoB[37-41] did not desorb and could not be forced off by increasing the surface pressure up to 23 mN/m. ApoB[37-41] adsorbed on the TO/W interface was completely elastic when compressed and expanded by +/-13% of its area. On an A/W interface, the apoB[37-41] monolayer became solid when compressed to 4 mN/m pressure indicating extended beta-sheet formation. It could be reversibly compressed and expanded between low pressure and its collapse pressure (35 mN/m). Our studies confirm that the AbetaS structure of apoB[37-41] is a lipid-binding motif that can irreversibly anchor apoB to lipoproteins.
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Affiliation(s)
- Libo Wang
- Department of Physiology and Biophysics, Boston University School of Medicine, Boston, MA 02118-2526, USA
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Mitsche MA, Wang L, Jiang ZG, McKnight CJ, Small DM. Interfacial properties of a complex multi-domain 490 amino acid peptide derived from apolipoprotein B (residues 292-782). LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:2322-2330. [PMID: 19146422 DOI: 10.1021/la802663g] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
ApolipoproteinB (ApoB) is a lipid binding protein that is a nonexchangeable component of chylomicrons, VLDL, and LDL. In the liver and intestinal cells ApoB recruits lipid to form nascent triacylglycerol rich particles cotranslationally in the endoplasmic reticulum membrane which are then processed and secreted to form plasma lipoproteins. The N-terminal domain, which comprises the first 22% of apoB, recruits lipid in a controlled manner. The first 6% (residues 1-291) of the N-terminus does not bind lipid. The first lipid binding domain, including residues 292-782 (B6-17), forms a lipid binding pocket which is predicted to consist of 17 alpha-helices and 6 beta-strands. A structural model based on the X-ray structure of the homologues protein lipovitellin suggests that the N-terminal 6-8 helices and the beta-sheet interact with lipid while the C-terminal helices form a structural unit stabilizing the beta-sheet. Using isothermal drop tensiometry we showed that ApoB6.4-17 is surface active and binds to a triolein/water interface and exerts 16-19 mN/m of pressure (Pi) on that surface. The protein initially adsorbs slowly from aqueous solution to the surface but following compression and re-expansion it reaches equilibrium much faster. When Pi exceeds 16.9 mN/m part of the protein is ejected from the surface, but when compressed to high Pi the protein is never completely ejected indicating that part of the peptide is irreversibly anchored to the interface. The surface dilation modulus (epsilon) varies between 25-38 mN/m, and is predominantly elastic with a small viscous component. When compressed at an air/water interface ApoB6.4-17 has a limiting area of approximately 11 A2 per amino acid at lift off and only approximately 7 A2 per amino acid at the collapse Pi (28 mN/m). These values are about half the anticipated values if all the residues are at the surface. This suggests that ApoB6.4-17 retains some globular structure at an interface and does not completely denature at the surface, as many other globular proteins do. We suggest that while bound to the surface ApoB6.4-17 exhibits properties of both alpha and beta structure giving it unique and versatile characteristics at a hydrophobic interface.
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Affiliation(s)
- Matthew A Mitsche
- Department of Physiology and Biophysics, Boston University School of Medicine, Boston, Massachusetts 02118, USA
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22
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Cherny I, Gazit E. Amyloids: not only pathological agents but also ordered nanomaterials. Angew Chem Int Ed Engl 2008; 47:4062-9. [PMID: 18412209 DOI: 10.1002/anie.200703133] [Citation(s) in RCA: 430] [Impact Index Per Article: 26.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Amyloid fibers constitute one of the most abundant and important naturally occurring self-associated assemblies. A variety of protein and peptide molecules with various amino acid sequences form these highly stable and well-organized assemblies under diverse conditions. These assemblies display phase states ranging from liquid crystals to rigid nanotubes. The potential applications of these supramolecular assemblies exceed those of synthetic polymers since the building blocks may introduce biological function in addition to mechanical properties. Here we review the structural characteristics of amyloidal supramolecular assemblies, their potential use as either natural or de novo designed sequences, and the range of applications that have been demonstrated so far.
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Affiliation(s)
- Izhack Cherny
- The Department of Molecular Microbiology and Biotechnology, Tel Aviv University, Tel Aviv 69978, Israel
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23
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Cherny I, Gazit E. Amyloide: nicht nur pathologische Substanzen, sondern auch geordnete Nanomaterialien. Angew Chem Int Ed Engl 2008. [DOI: 10.1002/ange.200703133] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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24
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Muenter AH, Hentschel J, Börner HG, Brezesinski G. Characterization of peptide-guided polymer assembly at the air/water interface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:3306-3316. [PMID: 18290677 DOI: 10.1021/la701909m] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
An organo-soluble, peptide-polymer conjugate that combines poly(n-butyl acrylate) with a beta-sheet-forming peptide is spread at the water surface to investigate peptide-guided self-assembly in a two-dimensional environment. Single layers of the conjugate are studied to gain information on the packing, orientation, and structure of the conjugate molecules using standard monolayer techniques: isotherms, grazing incidence X-ray diffraction (GIXD), and infrared reflection absorption spectroscopy (IRRAS). At all conditions studied, the stabilizing beta-sheet network consists of antiparallel beta-sheets oriented parallel to the air/water interface. The incorporation of temporary switch defects in the peptide segment enables beta-sheet assembly to be triggered at different packing densities. Stable monolayers, with low compressibilities similar to peptide monolayers, form when beta-sheet assembly occurs in monolayers that contain closely packed conjugate molecules. Langmuir-Schaefer transfer of the switched monolayer seeded with 1/1000 part stearic acid results in a transferred monolayer containing ordered domains with 7 nm wide stripes, a width in agreement with the end-to-end distance of the conjugate molecule. In this interfacial system, high packing densities and a hydrophobic seed molecule play an important role in beta-sheet network and structure formation. Both effects likely direct the highly ordered beta-sheet structure because of beta-strand prealignment. Insights gained from self-assembly in this system can be applied to peptide aggregation mechanisms in more complex interfacial environments.
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Affiliation(s)
- Annabel H Muenter
- Max Planck Institute of Colloids and Interfaces, MPI KG Golm, D-14424 Potsdam, Germany.
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25
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Ariga K, Hill JP, Lee MV, Vinu A, Charvet R, Acharya S. Challenges and breakthroughs in recent research on self-assembly. SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS 2008; 9:014109. [PMID: 27877935 PMCID: PMC5099804 DOI: 10.1088/1468-6996/9/1/014109] [Citation(s) in RCA: 389] [Impact Index Per Article: 24.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2008] [Revised: 05/13/2008] [Accepted: 02/22/2008] [Indexed: 05/18/2023]
Abstract
The controlled fabrication of nanometer-scale objects is without doubt one of the central issues in current science and technology. However, existing fabrication techniques suffer from several disadvantages including size-restrictions and a general paucity of applicable materials. Because of this, the development of alternative approaches based on supramolecular self-assembly processes is anticipated as a breakthrough methodology. This review article aims to comprehensively summarize the salient aspects of self-assembly through the introduction of the recent challenges and breakthroughs in three categories: (i) types of self-assembly in bulk media; (ii) types of components for self-assembly in bulk media; and (iii) self-assembly at interfaces.
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Affiliation(s)
- Katsuhiko Ariga
- World Premier International (WPI), Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan
| | - Jonathan P Hill
- World Premier International (WPI), Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan
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26
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Boldyreva EV. High-pressure diffraction studies of molecular organic solids. A personal view. Acta Crystallogr A 2007; 64:218-31. [DOI: 10.1107/s0108767307065786] [Citation(s) in RCA: 146] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2007] [Accepted: 12/05/2007] [Indexed: 11/10/2022] Open
Abstract
This paper discusses the trends in the experimental studies of molecular organic solids at high pressures by diffraction techniques. Crystallization of liquids, crystallization from solutions and solid-state transformations are considered. Special attention is paid to the high-pressure studies of pharmaceuticals and of biomimetics.
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27
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Abstract
Herein, we describe the design and surface-binding characterization of a de novo designed peptide, JAK1, which undergoes surface-induced folding at the hydroxyapatite (HA)-solution interface. JAK1 is designed to be unstructured in buffered saline solution, yet undergo HA-induced folding that is largely governed by the periodic positioning of gamma-carboxyglutamic acid (Gla) residues within the primary sequence of the peptide. Circular dichroism (CD) spectroscopy and analytical ultracentrifugation indicate that the peptide remains unfolded and monomeric in solution under normal physiological conditions; however, CD spectroscopy indicates that in the presence of hydroxyapatite, the peptide avidly binds to the mineral surface adopting a helical structure. Adsorption isotherms indicate nearly quantitative surface coverage and Kd = 310 nM for the peptide-surface binding event. X-ray photoelectron spectroscopy (XPS) coupled with the adsorption isotherm data suggests that JAK1 binds to HA, forming a self-limiting monolayer. This study demonstrates the feasibility of using HA surfaces to trigger the intramolecular folding of designed peptides and represents the initial stages of defining the design rules that allow HA-induced peptide folding.
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Affiliation(s)
- Lisa A Capriotti
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, USA
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28
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Cavalli S, Handgraaf JW, Tellers EE, Popescu DC, Overhand M, Kjaer K, Vaiser V, Sommerdijk NAJM, Rapaport H, Kros A. Two-Dimensional Ordered β-Sheet Lipopeptide Monolayers. J Am Chem Soc 2006; 128:13959-66. [PMID: 17044724 DOI: 10.1021/ja065479v] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A series of amphiphilic lipopeptides, ALPs, consisting of an alternating hydrophilic and hydrophobic amino acid residue sequence coupled to a phospholipid tail, was designed to form supramolecular assemblies composed of beta-sheet monolayers decorated by lipid tails at the air-water interface. A straightforward synthetic approach based on solid-phase synthesis, followed by an efficient purification protocol was used to prepare the lipid-peptide conjugates. Structural insight into the organization of monolayers was provided by surface pressure versus area isotherms, circular dichroism, Fourier transform infrared spectroscopy, and Brewster angle microscopy. In situ grazing-incidence X-ray diffraction (GIXD) revealed that lipopeptides six to eight amino acids in length form a new type of 2D self-organized monolayers that exhibit beta-sheet ribbons segregated by lipid tails. The conclusions drawn from the experimental findings were supported by a representative model based on molecular dynamics simulations of amphiphilic lipopeptides at the vacuum-water interface.
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Affiliation(s)
- Silvia Cavalli
- Contribution from the Leiden Institute of Chemistry, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands
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