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Diouf SIY, Williams DJ, Seifert S, Londoño-Calderon A, Pettes MT, Sheehan CJ, Firestone MA. Multi-stimuli responsive tetra-PPO60-PEO20 ethylene diamine block copolymer enables pH, temperature, and solvent regulation of Au nanoparticle composite plasmonic response. Polym Chem 2019. [DOI: 10.1039/c9py01098j] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Dynamic plasmonic tuning of Au NP organization through pH and temperature mediated polymer architecture transformation from lamellar to bicontinuous cubic.
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Hayden SC, Junghans A, Majewski J, Firestone MA. Reversible Lifting of Surface Supported Lipid Bilayers with a Membrane-Spanning Nonionic Triblock Copolymer. Biomacromolecules 2017; 18:1097-1107. [DOI: 10.1021/acs.biomac.6b01461] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Steven C. Hayden
- Materials Physics & Applications, Center for Integrated Nanotechnologies (CINT), Los Alamos National Laboratory, Mail Stop K771, Los Alamos, New Mexico 87545, United States
| | - Ann Junghans
- Lujan
Neutron Scattering Center, Los Alamos Neutron Science Center (LANSCE), Los Alamos National Laboratory, Mail Stop H805, Los Alamos, New Mexico 87545, United States
- Materials Science & Engineering (MST-7), Los Alamos National Laboratory, Mail Stop H805, Los Alamos, New Mexico 87545, United States
| | - Jaroslaw Majewski
- Materials Physics & Applications, Center for Integrated Nanotechnologies (CINT), Los Alamos National Laboratory, Mail Stop K771, Los Alamos, New Mexico 87545, United States
- Lujan
Neutron Scattering Center, Los Alamos Neutron Science Center (LANSCE), Los Alamos National Laboratory, Mail Stop H805, Los Alamos, New Mexico 87545, United States
- Department
of Chemical Engineering, University of California Davis, Davis, California 95616, United States
| | - Millicent A. Firestone
- Materials Physics & Applications, Center for Integrated Nanotechnologies (CINT), Los Alamos National Laboratory, Mail Stop K771, Los Alamos, New Mexico 87545, United States
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Chang D, Huang A, Olsen BD. Kinetic Effects on Self-Assembly and Function of Protein-Polymer Bioconjugates in Thin Films Prepared by Flow Coating. Macromol Rapid Commun 2016; 38. [DOI: 10.1002/marc.201600449] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2016] [Revised: 08/30/2016] [Indexed: 01/03/2023]
Affiliation(s)
- Dongsook Chang
- Department of Chemical Engineering; Massachusetts Institute of Technology; 77 Massachusetts Ave Cambridge MA 02142 USA
| | - Aaron Huang
- Department of Chemical Engineering; Massachusetts Institute of Technology; 77 Massachusetts Ave Cambridge MA 02142 USA
| | - Bradley D. Olsen
- Department of Chemical Engineering; Massachusetts Institute of Technology; 77 Massachusetts Ave Cambridge MA 02142 USA
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Lam CN, Kim M, Thomas CS, Chang D, Sanoja GE, Okwara CU, Olsen BD. The nature of protein interactions governing globular protein-polymer block copolymer self-assembly. Biomacromolecules 2014; 15:1248-58. [PMID: 24654888 DOI: 10.1021/bm401817p] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The effects of protein surface potential on the self-assembly of protein-polymer block copolymers are investigated in globular proteins with controlled shape through two approaches: comparison of self-assembly of mCherry-poly(N-isopropylacrylamide) (PNIPAM) bioconjugates with structurally homologous enhanced green fluorescent protein (EGFP)-PNIPAM bioconjugates, and mutants of mCherry with altered electrostatic patchiness. Despite large changes in amino acid sequence, the temperature-concentration phase diagrams of EGFP-PNIPAM and mCherry-PNIPAM conjugates have similar phase transition concentrations. Both materials form identical phases at two different coil fractions below the PNIPAM thermal transition temperature and in the bulk. However, at temperatures above the thermoresponsive transition, mCherry conjugates form hexagonal phases at high concentrations while EGFP conjugates form a disordered micellar phase. At lower concentration, mCherry shows a two-phase region while EGFP forms homogeneous disordered micellar structures, reflecting the effect of changes in micellar stability. Conjugates of four mCherry variants with changes to their electrostatic surface patchiness also showed minimal change in phase behavior, suggesting that surface patchiness has only a small effect on the self-assembly process. Measurements of protein/polymer miscibility, second virial coefficients, and zeta potential show that these coarse-grained interactions are similar between mCherry and EGFP, indicating that coarse-grained interactions largely capture the relevant physics for soluble, monomeric globular protein-polymer conjugate self-assembly.
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Affiliation(s)
- Christopher N Lam
- Department of Chemical Engineering, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States
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Thomas CS, Xu L, Olsen BD. Kinetically controlled nanostructure formation in self-assembled globular protein-polymer diblock copolymers. Biomacromolecules 2012; 13:2781-92. [PMID: 22924842 PMCID: PMC4059826 DOI: 10.1021/bm300763x] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Aqueous processing of globular protein-polymer diblock copolymers into solid-state materials and subsequent solvent annealing enables kinetic and thermodynamic control of nanostructure formation to produce block copolymer morphologies that maintain a high degree of protein fold and function. When model diblock copolymers composed of mCherry-b-poly(N-isopropylacrylamide) are used, orthogonal control over solubility of the protein block through changes in pH and the polymer block through changes in temperature is demonstrated during casting and solvent annealing. Hexagonal cylinders, perforated lamellae, lamellae, or hexagonal and disordered micellar phases are observed, depending on the coil fraction of the block copolymer and the kinetic pathway used for self-assembly. Good solvents for the polymer block produce ordered structures reminiscent of coil-coil diblock copolymers, while an unfavorable solvent results in kinetically trapped micellar structures. Decreasing solvent quality for the protein improves long-range ordering, suggesting that the strength of protein interactions influences nanostructure formation. Subsequent solvent annealing results in evolution of the nanostructures, with the best ordering and the highest protein function observed when annealing in a good solvent for both blocks. While protein secondary structure was found to be almost entirely preserved for all processing pathways, UV-vis spectroscopy of solid-state films indicates that using a good solvent for the protein block enables up to 70% of the protein to be retained in its functional form.
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Affiliation(s)
- Carla S. Thomas
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Liza Xu
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Bradley D. Olsen
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
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Multi-length scale evaluation of the temperature-tunable mechanical properties of a lyotropic mesophase. Polym J 2012. [DOI: 10.1038/pj.2012.99] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Thomas CS, Glassman MJ, Olsen BD. Solid-state nanostructured materials from self-assembly of a globular protein-polymer diblock copolymer. ACS NANO 2011; 5:5697-707. [PMID: 21696135 PMCID: PMC4059825 DOI: 10.1021/nn2013673] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Self-assembly of three-dimensional solid-state nanostructures containing approximately 33% by weight globular protein is demonstrated using a globular protein-polymer diblock copolymer, providing a route to direct nanopatterning of proteins for use in bioelectronic and biocatalytic materials. A mutant red fluorescent protein, mCherryS131C, was prepared by incorporation of a unique cysteine residue and site-specifically conjugated to end-functionalized poly(N-isopropylacrylamide) through thiol-maleimide coupling to form a well-defined model protein-polymer block copolymer. The block copolymer was self-assembled into bulk nanostructures by solvent evaporation from concentrated solutions. Small-angle X-ray scattering and transmission electron microscopy illustrated the formation of highly disordered lamellae or hexagonally perforated lamellae depending upon the selectivity of the solvent during evaporation. Solvent annealing of bulk samples resulted in a transition toward lamellar nanostructures with mCherry packed in a bilayer configuration and a large improvement in long-range ordering. Wide-angle X-ray scattering indicated that mCherry did not crystallize within the block copolymer nanodomains and that the β-sheet spacing was not affected by self-assembly. Circular dichroism showed no change in protein secondary structure after self-assembly, while UV-vis spectroscopy indicated approximately 35% of the chromophore remained optically active.
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Affiliation(s)
- Carla S. Thomas
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Matthew J. Glassman
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Bradley D. Olsen
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
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Crisci A, Hay DNT, Seifert S, Firestone MA. pH- and Ionic-Strength-Induced Structural Changes in Poly(acrylic acid)-Lipid-Based Self-Assembled Materials. ACTA ACUST UNITED AC 2009. [DOI: 10.1002/masy.200950717] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Lee B, Firestone MA. Electron Density Mapping of Triblock Copolymers Associated with Model Biomembranes: Insights into Conformational States and Effect on Bilayer Structure. Biomacromolecules 2008; 9:1541-50. [DOI: 10.1021/bm701348r] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Byeongdu Lee
- X-ray Science and Materials Science Divisions, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439
| | - Millicent A. Firestone
- X-ray Science and Materials Science Divisions, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439
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Reiss BD, Hanson DK, Firestone MA. Evaluation of the Photosynthetic Reaction Center Protein for Potential Use as a Bioelectronic Circuit Element. Biotechnol Prog 2007. [DOI: 10.1002/bp070042s] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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