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Tang Q, Deng N, Chen J, Sun H, Dong Y, Zeng Q, Yuan H, Binks BP, Meng T. One-Step Fabrication of Coconut-Like Capsules via Competitive Reactions at an All-Aqueous Interface for Enzyme Immobilization. ACS APPLIED MATERIALS & INTERFACES 2023; 15:10621-10628. [PMID: 36800174 DOI: 10.1021/acsami.2c19788] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
A concept of interfacial competitive reaction between biomineralization and alginate gelation at an all-aqueous single-emulsion droplet interface to prepare robust coconut-like capsules (inner hard wall and outer soft wall) is developed. The concept is further applied for enzyme immobilization with high encapsulation efficiency, enzyme loading, mass transfer coefficient, and recyclability. The thickness and swelling properties of the shell are simply tunable by a competitive reaction. Our platform may open a green, facile, and efficient way to prepare organic-inorganic hybrid sustainable materials with tailored compositions and structures.
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Affiliation(s)
- Qiming Tang
- Sichuan Engineering Research Center for Biomimetic Synthesis of Natural Drugs, School of Life Sciences and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, P. R. China
| | - Ningjun Deng
- Sichuan Engineering Research Center for Biomimetic Synthesis of Natural Drugs, School of Life Sciences and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, P. R. China
| | - Jialin Chen
- Sichuan Engineering Research Center for Biomimetic Synthesis of Natural Drugs, School of Life Sciences and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, P. R. China
| | - Hejia Sun
- Sichuan Engineering Research Center for Biomimetic Synthesis of Natural Drugs, School of Life Sciences and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, P. R. China
| | - Yuman Dong
- Sichuan Engineering Research Center for Biomimetic Synthesis of Natural Drugs, School of Life Sciences and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, P. R. China
| | - Qi Zeng
- Sichuan Engineering Research Center for Biomimetic Synthesis of Natural Drugs, School of Life Sciences and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, P. R. China
| | - Hao Yuan
- Sichuan Engineering Research Center for Biomimetic Synthesis of Natural Drugs, School of Life Sciences and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, P. R. China
| | - Bernard P Binks
- Department of Chemistry, University of Hull, Hull HU6 7RX, U.K
| | - Tao Meng
- Sichuan Engineering Research Center for Biomimetic Synthesis of Natural Drugs, School of Life Sciences and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, P. R. China
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2
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Doering U, Grigoriev D, Tapio K, Bald I, Böker A. Synthesis of nanostructured protein-mineral-microcapsules by sonication. SOFT MATTER 2022; 18:2558-2568. [PMID: 35294511 DOI: 10.1039/d1sm01638e] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
We propose a simple and eco-friendly method for the formation of composite protein-mineral-microcapsules induced by ultrasound treatment. Protein- and nanoparticle-stabilized oil-in-water (O/W) emulsions loaded with different oils are prepared using high-intensity ultrasound. The formation of thin composite mineral proteinaceous shells is realized with various types of nanoparticles, which are pre-modified with Bovine Serum Albumin (BSA) and subsequently characterized by EDX, TGA, zeta potential measurements and Raman spectroscopy. Cryo-SEM and EDX mapping visualizations show the homogeneous distribution of the densely packed nanoparticles in the capsule shell. In contrast to the results reported in our previous paper,1 the shell of those nanostructured composite microcapsules is not cross-linked by the intermolecular disulfide bonds between BSA molecules. Instead, a Pickering-Emulsion formation takes place because of the amphiphilicity-driven spontaneous attachment of the BSA-modified nanoparticles at the oil/water interface. Using colloidal particles for the formation of the shell of the microcapsules, in our case silica, hydroxyapatite and calcium carbonate nanoparticles, is promising for the creation of new functional materials. The nanoparticulate building blocks of the composite shell with different chemical, physical or morphological properties can contribute to additional, sometimes even multiple, features of the resulting capsules. Microcapsules with shells of densely packed nanoparticles could find interesting applications in pharmaceutical science, cosmetics or in food technology.
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Affiliation(s)
- Ulrike Doering
- University of Potsdam, Institute of Chemistry, Karl-Liebknecht-Str. 24-25, 14476, Potsdam, Germany
| | - Dmitry Grigoriev
- Fraunhofer Institute for Applied Polymer Research IAP, Geiselbergstr. 69, 14476 Potsdam, Germany.
| | - Kosti Tapio
- University of Potsdam, Institute of Chemistry, Karl-Liebknecht-Str. 24-25, 14476, Potsdam, Germany
- University of Jyväskylä, Department of Physics and Nanoscience Center, P.O. Box 35, Fi-40014 Jyväskylä, Finland
| | - Ilko Bald
- University of Potsdam, Institute of Chemistry, Karl-Liebknecht-Str. 24-25, 14476, Potsdam, Germany
| | - Alexander Böker
- Fraunhofer Institute for Applied Polymer Research IAP, Geiselbergstr. 69, 14476 Potsdam, Germany.
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3
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Mokhtari-Abpangoui M, Lohrasbi-Nejad A, Zolala J, Torkzadeh-Mahani M, Ghanbari S. Improvement Thermal Stability of D-Lactate Dehydrogenase by Hydrophobin-1 and in Silico Prediction of Protein-Protein Interactions. Mol Biotechnol 2021; 63:919-932. [PMID: 34109551 DOI: 10.1007/s12033-021-00342-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Accepted: 05/18/2021] [Indexed: 10/21/2022]
Abstract
Hydrophobins are small surface-active proteins. They can connect to hydrophobic or hydrophilic regions and oligomerize in solution to form massive construction. In nature, these proteins are produced by filamentous fungi at different stages of growth. So far, researchers have used them in various fields of biotechnology. In this study, recombinant hydrophobin-1 (rHFB1, 7.5 kDa) was used to stabilize recombinant D-lactate dehydrogenase (rD-LDH, 35 kDa). rD-LDH is a sensitive enzyme deactivated and oxidized by external agents such as O2 and lights. So, its stabilization with rHFB1 can be the best index to demonstrate the positive effect of rHFB1 on preserving and improving enzyme's activity. The unique ability of rHFB1 for interacting with hydrophobic regions of rD-LDH was predicted by protein-protein docking study with ClusPro and PIC servers and confirmed by fluorescence experiments, and Colorless Native-PAGE. Measurement of thermodynamic parameters allows for authenticating the role of rHFB1 as a thermal stabilizer in the protein-protein complex (rD-LDH@rHFB1). Interaction between rHFB1 and rD-LDH improved half-life of enzyme 2.25-fold at 40 °C. Investigation of the kinetic parameters proved that the presence of rHFB1 along with the rD-LDH enhancement strongly the affinity of the enzyme for pyruvate. Furthermore, an increase of Kcat/Km for complex displayed the effect of rHFB1 for improving the enzyme's catalytic efficiency.
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Affiliation(s)
| | - Azadeh Lohrasbi-Nejad
- Department of Agricultural Biotechnology, Shahid Bahonar University of Kerman, Kerman, Iran.
| | - Jafar Zolala
- Department of Agricultural Biotechnology, Shahid Bahonar University of Kerman, Kerman, Iran
| | - Masoud Torkzadeh-Mahani
- Department of Biotechnology, Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman, Iran
| | - Saba Ghanbari
- Department of Biotechnology, Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman, Iran
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4
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Simple production of hydrophobin-fused domain III of dengue envelope protein and induction of neutralizing antibodies against the homotypic serotype of dengue virus. Biotechnol Lett 2019; 42:419-428. [PMID: 31828570 DOI: 10.1007/s10529-019-02767-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2019] [Accepted: 11/19/2019] [Indexed: 12/17/2022]
Abstract
Hydrophobin-fused domain III of dengue envelope proteins serotypes 1 and 2 were expressed in Rachiplusia nu larvae and purified by aqueous two-phase system. This biotechnological approach of hydrophobin-fused proteins, which allowed obtaining 97.7 µg/larva of fusion protein DomIII serotype 1 and 61.4 µg/larva of fusion protein DomIII serotype 2, represents an integrated strategy for simple production of recombinant antigens. Purified fusion proteins induced serotype-specific neutralizing antibodies without cross-reaction against other serotypes and arboviruses after mouse immunization. hydrophobin-fused domain III of dengue envelope protein could be a promising strategy for easy and low-cost production of components of a tetravalent sub-unit vaccine against dengue.
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Ghosh SK, Böker A. Self‐Assembly of Nanoparticles in 2D and 3D: Recent Advances and Future Trends. MACROMOL CHEM PHYS 2019. [DOI: 10.1002/macp.201900196] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
| | - Alexander Böker
- Fraunhofer‐Institut für Angewandte Polymerforschung Geiselbergstraβe 69 14476 Potsdam‐Golm Germany
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6
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Nuruzzaman M, Liu Y, Rahman MM, Naidu R, Dharmarajan R, Shon HK, Woo YC. Core-Shell Interface-Oriented Synthesis of Bowl-Structured Hollow Silica Nanospheres Using Self-Assembled ABC Triblock Copolymeric Micelles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:13584-13596. [PMID: 30352161 DOI: 10.1021/acs.langmuir.8b00792] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Hollow porous silica nanospheres (HSNs) are emerging classes of cutting-edge nanostructured materials. They have elicited much interest as carriers of active molecule delivery due to their amorphous chemical structure, nontoxic nature, and biocompatibility. Structural development with hierarchical morphology is mostly required to obtain the desired performance. In this context, large through-holes or pore openings on shells are desired so that the postsynthesis loading of active-molecule onto HSNs via a simple immersion method can be facilitated. This study reports the synthesis of HSNs with large through-holes or pore openings on shells, which are subsequently termed bowl-structured hollow porous silica nanospheres (BHSNs). The synthesis of BHSNs was mediated by the core-shell interfaces of the core-shell corona-structured micelles obtained from a commercially available ABC triblock copolymer (polystyrene- b-poly(2-vinylpyridine)- b-poly(ethylene oxide) (PS-P2VP-PEO)). In this synthesis process, polymer@SiO2 composite structure was formed because of the deposition of silica (SiO2) on the micelles' core. The P2VP block played a significant role in the hydrolysis and condensation of the silica precursor, i.e., tetraethylorthosilicate (TEOS) and then maintaining the shell's growth. The PS core of the micelles built the void spaces. Transmission electron microscopy (TEM) images revealed a spherical hollow structure with an average particle size of 41.87 ± 3.28 nm. The average diameter of void spaces was 21.71 ± 1.22 nm, and the shell thickness was 10.17 ± 1.68 nm. According to the TEM image analysis, the average large pore was determined to be 15.95 nm. Scanning electron microscopy (SEM) images further confirmed the presence of large single pores or openings in shells. These were formed as a result of the accumulated ethanol on the PS core acting to prevent the growth of silica.
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Affiliation(s)
- Md Nuruzzaman
- Global Centre for Environmental Remediation (GCER), Faculty of Science , The University of Newcastle , Callaghan , NSW 2308 , Australia
- Cooperative Research Centre for Contamination Assessment and Remediation of the Environment (CRC CARE), ATC Building , The University of Newcastle , Callaghan , NSW 2308 , Australia
| | - Yanju Liu
- Global Centre for Environmental Remediation (GCER), Faculty of Science , The University of Newcastle , Callaghan , NSW 2308 , Australia
- Cooperative Research Centre for Contamination Assessment and Remediation of the Environment (CRC CARE), ATC Building , The University of Newcastle , Callaghan , NSW 2308 , Australia
| | - Mohammad Mahmudur Rahman
- Global Centre for Environmental Remediation (GCER), Faculty of Science , The University of Newcastle , Callaghan , NSW 2308 , Australia
- Cooperative Research Centre for Contamination Assessment and Remediation of the Environment (CRC CARE), ATC Building , The University of Newcastle , Callaghan , NSW 2308 , Australia
| | - Ravi Naidu
- Global Centre for Environmental Remediation (GCER), Faculty of Science , The University of Newcastle , Callaghan , NSW 2308 , Australia
- Cooperative Research Centre for Contamination Assessment and Remediation of the Environment (CRC CARE), ATC Building , The University of Newcastle , Callaghan , NSW 2308 , Australia
| | - Rajarathnam Dharmarajan
- Global Centre for Environmental Remediation (GCER), Faculty of Science , The University of Newcastle , Callaghan , NSW 2308 , Australia
- Cooperative Research Centre for Contamination Assessment and Remediation of the Environment (CRC CARE), ATC Building , The University of Newcastle , Callaghan , NSW 2308 , Australia
| | - Ho Kyong Shon
- Cooperative Research Centre for Contamination Assessment and Remediation of the Environment (CRC CARE), ATC Building , The University of Newcastle , Callaghan , NSW 2308 , Australia
- Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering , University of Technology Sydney (UTS) , P.O. Box 123, 15 Broadway , Sydney , NSW 2007 , Australia
| | - Yun Chul Woo
- Department of Land, Water and Environment Research , Korea Institute of Civil Engineering and Building Technology (KICT) , 283, Goyangdae-Ro, Ilsanseo-Gu , Goyang-Si , Gyeonggi-Do 411-712 , Republic of Korea
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7
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Abstract
Surfaces and interfaces are ubiquitous in nature and are involved in many biological processes. Due to this, natural organisms have evolved a number of methods to control interfacial and surface properties. Many of these methods involve the use of specialised protein biosurfactants, which due to the competing demands of high surface activity, biocompatibility, and low solution aggregation may take structures that differ from the traditional head–tail structure of small molecule surfactants. As well as their biological functions, these proteins have also attracted interest for industrial applications, in areas including food technology, surface modification, and drug delivery. To understand the biological functions and technological applications of protein biosurfactants, it is necessary to have a molecular level description of their behaviour, in particular at surfaces and interfaces, for which molecular simulation is well suited to investigate. In this review, we will give an overview of simulation studies of a number of examples of protein biosurfactants (hydrophobins, surfactin, and ranaspumin). We will also outline some of the key challenges and future directions for molecular simulation in the investigation of protein biosurfactants and how this can help guide future developments.
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8
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Cheung DL. Adsorption and conformations of lysozyme and α-lactalbumin at a water-octane interface. J Chem Phys 2018; 147:195101. [PMID: 29166117 DOI: 10.1063/1.4994561] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
As proteins contain both hydrophobic and hydrophilic amino acids, they will readily adsorb onto interfaces between water and hydrophobic fluids such as oil. This adsorption normally causes changes in the protein structure, which can result in loss of protein function and irreversible adsorption, leading to the formation of protein interfacial films. While this can be advantageous in some applications (e.g., food technology), in most cases it limits our ability to exploit protein functionality at interfaces. To understand and control protein interfacial adsorption and function, it is necessary to understand the microscopic conformation of proteins at liquid interfaces. In this paper, molecular dynamics simulations are used to investigate the adsorption and conformation of two similar proteins, lysozyme and α-lactalbumin, at a water-octane interface. While they both adsorb onto the interface, α-lactalbumin does so in a specific orientation, mediated by two amphipathic helices, while lysozyme adsorbs in a non-specific manner. Using replica exchange simulations, both proteins are found to possess a number of distinct interfacial conformations, with compact states similar to the solution conformation being most common for both proteins. Decomposing the different contributions to the protein energy at oil-water interfaces suggests that conformational change for α-lactalbumin, unlike lysozyme, is driven by favourable protein-oil interactions. Revealing these differences between the factors that govern the conformational change at interfaces in otherwise similar proteins can give insight into the control of protein interfacial adsorption, aggregation, and function.
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Affiliation(s)
- David L Cheung
- School of Chemistry, National University of Ireland Galway, Galway, Ireland
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9
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Kaufman G, Liu W, Williams DM, Choo Y, Gopinadhan M, Samudrala N, Sarfati R, Yan ECY, Regan L, Osuji CO. Flat Drops, Elastic Sheets, and Microcapsules by Interfacial Assembly of a Bacterial Biofilm Protein, BslA. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:13590-13597. [PMID: 29094950 DOI: 10.1021/acs.langmuir.7b03226] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Protein adsorption and assembly at interfaces provide a potentially versatile route to create useful constructs for fluid compartmentalization. In this context, we consider the interfacial assembly of a bacterial biofilm protein, BslA, at air-water and oil-water interfaces. Densely packed, high modulus monolayers form at air-water interfaces, leading to the formation of flattened sessile water drops. BslA forms elastic sheets at oil-water interfaces, leading to the production of stable monodisperse oil-in-water microcapsules. By contrast, water-in-oil microcapsules are unstable but display arrested rather than full coalescence on contact. The disparity in stability likely originates from a low areal density of BslA hydrophobic caps on the exterior surface of water-in-oil microcapsules, relative to the inverse case. In direct analogy with small molecule surfactants, the lack of stability of individual water-in-oil microcapsules is consistent with the large value of the hydrophilic-lipophilic balance (HLB number) calculated based on the BslA crystal structure. The occurrence of arrested coalescence indicates that the surface activity of BslA is similar to that of colloidal particles that produce Pickering emulsions, with the stability of partially coalesced structures ensured by interfacial jamming. Micropipette aspiration and flow in tapered capillaries experiments reveal intriguing reversible and nonreversible modes of mechanical deformation, respectively. The mechanical robustness of the microcapsules and the ability to engineer their shape and to design highly specific binding responses through protein engineering suggest that these microcapsules may be useful for biomedical applications.
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Affiliation(s)
- Gilad Kaufman
- Department of Chemical and Environmental Engineering, ‡Department of Chemistry, §Department of Molecular Biophysics and Biochemistry, ∥Department of Physics, and ⊥The Integrated Graduate Program in Physical and Engineering Biology, Yale University , New Haven, Connecticut 06511, United States
| | - Wei Liu
- Department of Chemical and Environmental Engineering, ‡Department of Chemistry, §Department of Molecular Biophysics and Biochemistry, ∥Department of Physics, and ⊥The Integrated Graduate Program in Physical and Engineering Biology, Yale University , New Haven, Connecticut 06511, United States
| | - Danielle M Williams
- Department of Chemical and Environmental Engineering, ‡Department of Chemistry, §Department of Molecular Biophysics and Biochemistry, ∥Department of Physics, and ⊥The Integrated Graduate Program in Physical and Engineering Biology, Yale University , New Haven, Connecticut 06511, United States
| | - Youngwoo Choo
- Department of Chemical and Environmental Engineering, ‡Department of Chemistry, §Department of Molecular Biophysics and Biochemistry, ∥Department of Physics, and ⊥The Integrated Graduate Program in Physical and Engineering Biology, Yale University , New Haven, Connecticut 06511, United States
| | - Manesh Gopinadhan
- Department of Chemical and Environmental Engineering, ‡Department of Chemistry, §Department of Molecular Biophysics and Biochemistry, ∥Department of Physics, and ⊥The Integrated Graduate Program in Physical and Engineering Biology, Yale University , New Haven, Connecticut 06511, United States
| | - Niveditha Samudrala
- Department of Chemical and Environmental Engineering, ‡Department of Chemistry, §Department of Molecular Biophysics and Biochemistry, ∥Department of Physics, and ⊥The Integrated Graduate Program in Physical and Engineering Biology, Yale University , New Haven, Connecticut 06511, United States
| | - Raphael Sarfati
- Department of Chemical and Environmental Engineering, ‡Department of Chemistry, §Department of Molecular Biophysics and Biochemistry, ∥Department of Physics, and ⊥The Integrated Graduate Program in Physical and Engineering Biology, Yale University , New Haven, Connecticut 06511, United States
| | - Elsa C Y Yan
- Department of Chemical and Environmental Engineering, ‡Department of Chemistry, §Department of Molecular Biophysics and Biochemistry, ∥Department of Physics, and ⊥The Integrated Graduate Program in Physical and Engineering Biology, Yale University , New Haven, Connecticut 06511, United States
| | - Lynne Regan
- Department of Chemical and Environmental Engineering, ‡Department of Chemistry, §Department of Molecular Biophysics and Biochemistry, ∥Department of Physics, and ⊥The Integrated Graduate Program in Physical and Engineering Biology, Yale University , New Haven, Connecticut 06511, United States
| | - Chinedum O Osuji
- Department of Chemical and Environmental Engineering, ‡Department of Chemistry, §Department of Molecular Biophysics and Biochemistry, ∥Department of Physics, and ⊥The Integrated Graduate Program in Physical and Engineering Biology, Yale University , New Haven, Connecticut 06511, United States
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10
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Garakani TM, Richter MJ, Böker A. Controlling the bio-inspired synthesis of silica. J Colloid Interface Sci 2017; 488:322-334. [PMID: 27838557 DOI: 10.1016/j.jcis.2016.10.069] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2016] [Revised: 10/20/2016] [Accepted: 10/25/2016] [Indexed: 11/24/2022]
Abstract
The influence of different parameters on the silicification procedure using lysozyme is reported. When polyethoxysiloxane (PEOS), an internally crosslinked silica reservoir, is used, regular structures with a narrow size distribution could be obtained only via introducing the silica precursor in two steps including initial dropping and subsequent addition of residual oil phase in one portion. We found that mixing sequence of mineralizing agents in the presence of a positively charged surfactant plays a key role in terms of silica precipitation when tetraethoxyorthosilicate (TEOS) is the oil phase. In contrast, well-mineralized crumpled features with high specific surface area could be synthesized in the presence of PEOS as a silica precursor polymer, regardless of mixing sequence. Moreover, introducing sodium dodecyl sulfate (SDS) as a negatively charged surfactant resulted in regular silica sphere formation only in combination with hexylene glycol (MPD) as a specific co-solvent. Finally, it is demonstrated that by inclusion of different nanoparticles even more sophisticated hybrid materials can be generated.
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Affiliation(s)
- Tayebeh Mirzaei Garakani
- DWI - Leibniz-Institut für Interaktive Materialien e.V., Lehrstuhl für Makromolekulare Materialien und Oberflächen, RWTH Aachen University, Forckenbeckstr. 50, D-52062 Aachen, Germany
| | - Marina Juliane Richter
- DWI - Leibniz-Institut für Interaktive Materialien e.V., Lehrstuhl für Makromolekulare Materialien und Oberflächen, RWTH Aachen University, Forckenbeckstr. 50, D-52062 Aachen, Germany
| | - Alexander Böker
- Fraunhofer Institute for Applied Polymer Research (IAP), Geiselbergstr. 69, 14476 Potsdam-Golm, Germany; Lehrstuhl für Polymermaterialien und Polymertechnologie, Universität Potsdam, 14476 Potsdam-Golm, Germany.
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11
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Cui W, Wang A, Zhao J, Li J. Biomacromolecules based core/shell architecture toward biomedical applications. Adv Colloid Interface Sci 2016; 237:43-51. [PMID: 27773338 DOI: 10.1016/j.cis.2016.10.001] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2016] [Revised: 10/03/2016] [Accepted: 10/04/2016] [Indexed: 01/17/2023]
Abstract
Polyelectrolyte multilayer capsules have become a novel and promising class of hybrid materials with great potential since they can be applied in various areas, such as pharmaceutical sciences, biotechnology, and biomedicine. The concept of using such carriers for biology application is diagnosis and treatment of diseases for convenience, safety and specific targeting. Therefore, the development of biocompatible, biodegradable and specific characteristic nanostructure material is highly desirable. Much effort has been devoted to exploring innovative and effective techniques to fabricate such materials. Among the available techniques, layer-by-layer (LbL) assembly capsules have attracted considerable attention attributing to the flexibly controlled size, shape, composition, wall thickness and functions. Protein, as the large class of biomacromolecules, was incorporated into capsules for improving the biocompatibility and specific function. In this review we provide an overview of the recent progress in biomacromolecular capsules or core/shell architecture with different diameters for the variety of purposes. The size ranging from micro-, sub-micro to nano scale based on the choice of the template. Their advantages are discussed here. The applications of these biomacromolecular capsules in biotechnological fields have also been summarized, for instance blood substitute, ATP carriers, photodynamic therapy and nanomedicines.
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12
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Immobilization of LccC Laccase from Aspergillus nidulans on Hard Surfaces via Fungal Hydrophobins. Appl Environ Microbiol 2016; 82:6395-6402. [PMID: 27565614 DOI: 10.1128/aem.01413-16] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2016] [Accepted: 08/09/2016] [Indexed: 11/20/2022] Open
Abstract
Fungal hydrophobins are small amphiphilic proteins that can be used for coatings on hydrophilic and hydrophobic surfaces. Through the formation of monolayers, they change the hydrophobicity of a given surface. Especially, the class I hydrophobins are interesting for biotechnology, because their layers are stable at high temperatures and can only be removed with strong solvents. These proteins self-assemble into monolayers under physiological conditions and undergo conformational changes that stabilize the layer structure. Several studies have demonstrated how the fusion of hydrophobins with short peptides allows the specific modification of the properties of a given surface or have increased the protein production levels through controlled localization of hydrophobin molecules inside the cell. Here, we fused the Aspergillus nidulans laccase LccC to the class I hydrophobins DewA and DewB and used the fusion proteins to functionalize surfaces with immobilized enzymes. In contrast to previous studies with enzymes fused to class II hydrophobins, the DewA-LccC fusion protein is secreted into the culture medium. The crude culture supernatant was directly used for coatings of glass and polystyrene without additional purification steps. The highest laccase surface activity was achieved after protein immobilization on modified hydrophilic polystyrene at pH 7. This study presents an easy-to-use alternative to classical enzyme immobilization techniques and can be applied not only for laccases but also for other biotechnologically relevant enzymes. IMPORTANCE Although fusion with small peptides to modify hydrophobin properties has already been performed in several studies, fusion with an enzyme presents a more challenging task. Both protein partners need to remain in active form so that the hydrophobins can interact with one another and form layers, and so the enzyme (e.g., laccase) will remain active at the same time. Also, because of the amphiphilic nature of hydrophobins, their production and purification remain challenging so far and often include steps that would irreversibly disrupt most enzymes. In our study, we present the first functional fusion proteins of class I hydrophobins from A. nidulans with a laccase. The resulting fusion enzyme is directly secreted into the culture medium by the fungus and can be used for the functionalization of hard surfaces.
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13
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Richter MJ, Schulz A, Subkowski T, Böker A. Adsorption and rheological behavior of an amphiphilic protein at oil/water interfaces. J Colloid Interface Sci 2016; 479:199-206. [DOI: 10.1016/j.jcis.2016.06.062] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2016] [Revised: 06/24/2016] [Accepted: 06/27/2016] [Indexed: 10/21/2022]
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14
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Gazzera L, Milani R, Pirrie L, Schmutz M, Blanck C, Resnati G, Metrangolo P, Krafft MP. Design of Highly Stable Echogenic Microbubbles through Controlled Assembly of Their Hydrophobin Shell. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201603706] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Lara Gazzera
- NFMLab; Politecnico di Milano; Via Mancinelli 7 20131 Milano Italy
| | - Roberto Milani
- VTT-Technical Research Centre of Finland Ltd; Biologinkuja 7 Espoo 02044 VTT Finland
| | - Lisa Pirrie
- VTT-Technical Research Centre of Finland Ltd; Biologinkuja 7 Espoo 02044 VTT Finland
| | - Marc Schmutz
- Institut Charles Sadron (CNRS); University of Strasbourg; 23 rue du Loess 67034 Strasbourg France
| | - Christian Blanck
- Institut Charles Sadron (CNRS); University of Strasbourg; 23 rue du Loess 67034 Strasbourg France
| | - Giuseppe Resnati
- NFMLab; Politecnico di Milano; Via Mancinelli 7 20131 Milano Italy
| | - Pierangelo Metrangolo
- NFMLab; Politecnico di Milano; Via Mancinelli 7 20131 Milano Italy
- VTT-Technical Research Centre of Finland Ltd; Biologinkuja 7 Espoo 02044 VTT Finland
| | - Marie Pierre Krafft
- Institut Charles Sadron (CNRS); University of Strasbourg; 23 rue du Loess 67034 Strasbourg France
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15
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Gazzera L, Milani R, Pirrie L, Schmutz M, Blanck C, Resnati G, Metrangolo P, Krafft MP. Design of Highly Stable Echogenic Microbubbles through Controlled Assembly of Their Hydrophobin Shell. Angew Chem Int Ed Engl 2016; 55:10263-7. [DOI: 10.1002/anie.201603706] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2016] [Revised: 05/19/2016] [Indexed: 11/08/2022]
Affiliation(s)
- Lara Gazzera
- NFMLab; Politecnico di Milano; Via Mancinelli 7 20131 Milano Italy
| | - Roberto Milani
- VTT-Technical Research Centre of Finland Ltd; Biologinkuja 7 Espoo 02044 VTT Finland
| | - Lisa Pirrie
- VTT-Technical Research Centre of Finland Ltd; Biologinkuja 7 Espoo 02044 VTT Finland
| | - Marc Schmutz
- Institut Charles Sadron (CNRS); University of Strasbourg; 23 rue du Loess 67034 Strasbourg France
| | - Christian Blanck
- Institut Charles Sadron (CNRS); University of Strasbourg; 23 rue du Loess 67034 Strasbourg France
| | - Giuseppe Resnati
- NFMLab; Politecnico di Milano; Via Mancinelli 7 20131 Milano Italy
| | - Pierangelo Metrangolo
- NFMLab; Politecnico di Milano; Via Mancinelli 7 20131 Milano Italy
- VTT-Technical Research Centre of Finland Ltd; Biologinkuja 7 Espoo 02044 VTT Finland
| | - Marie Pierre Krafft
- Institut Charles Sadron (CNRS); University of Strasbourg; 23 rue du Loess 67034 Strasbourg France
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16
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Nishizawa N, Kawamura A, Kohri M, Nakamura Y, Fujii S. Polydopamine Particle as a Particulate Emulsifier. Polymers (Basel) 2016; 8:E62. [PMID: 30979157 PMCID: PMC6432528 DOI: 10.3390/polym8030062] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2016] [Revised: 02/09/2016] [Accepted: 02/18/2016] [Indexed: 11/17/2022] Open
Abstract
"Pickering-type" emulsions were prepared using polydopamine (PDA) particles as a particulate emulsifier and n-dodecane, methyl myristate, toluene or dichloromethane as an oil phase. All the emulsions prepared were oil-in-water type and an increase of PDA particle concentration decreased oil droplet diameter. The PDA particles adsorbed to oil⁻water interface can be crosslinked using poly(ethylene imine) as a crosslinker, and the PDA particle-based colloidosomes were successfully fabricated. Scanning electron microscopy studies of the colloidosomes after removal of inner oil phase revealed a capsule morphology, which is strong evidence for the attachment of PDA particles at the oil⁻water interface thereby stabilizing the emulsion. The colloidosomes after removal of inner oil phase could retain their capsule morphology, even after sonication. On the other hand, the residues obtained after oil phase removal from the PDA particle-stabilized emulsion prepared in the absence of any crosslinker were broken into small fragments of PDA particle flocs after sonication.
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Affiliation(s)
- Nobuaki Nishizawa
- Department of Applied Chemistry, Osaka Institute of Technology, 5-16-1 Omiya, Asahi-ku, Osaka 535-8585, Japan.
| | - Ayaka Kawamura
- Division of Applied Chemistry and Biotechnology, Graduate School of Engineering, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan.
| | - Michinari Kohri
- Division of Applied Chemistry and Biotechnology, Graduate School of Engineering, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan.
| | - Yoshinobu Nakamura
- Department of Applied Chemistry, Osaka Institute of Technology, 5-16-1 Omiya, Asahi-ku, Osaka 535-8585, Japan.
| | - Syuji Fujii
- Department of Applied Chemistry, Osaka Institute of Technology, 5-16-1 Omiya, Asahi-ku, Osaka 535-8585, Japan.
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17
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Shi J, Wang X, Zhang S, Tang L, Jiang Z. Enzyme-conjugated ZIF-8 particles as efficient and stable Pickering interfacial biocatalysts for biphasic biocatalysis. J Mater Chem B 2016; 4:2654-2661. [DOI: 10.1039/c6tb00104a] [Citation(s) in RCA: 82] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Enzyme-based biphasic catalytic reactions were successfully accomplished by utilizing CRL-conjugated ZIF-8 particles as robust Pickering interfacial biocatalysts.
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Affiliation(s)
- Jiafu Shi
- School of Environmental Science & Engineering
- Tianjin University
- Tianjin 300072
- P. R. China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin)
| | - Xiaoli Wang
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin)
- Tianjin 300072
- P. R. China
- Key Laboratory for Green Chemical Technology of Ministry of Education
- School of Chemical Engineering and Technology
| | - Shaohua Zhang
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin)
- Tianjin 300072
- P. R. China
- Key Laboratory for Green Chemical Technology of Ministry of Education
- School of Chemical Engineering and Technology
| | - Lei Tang
- Key Laboratory for Green Chemical Technology of Ministry of Education
- School of Chemical Engineering and Technology
- Tianjin University
- Tianjin 300072
- P. R. China
| | - Zhongyi Jiang
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin)
- Tianjin 300072
- P. R. China
- Key Laboratory for Green Chemical Technology of Ministry of Education
- School of Chemical Engineering and Technology
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18
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Atomistic simulation of hydrophobin HFBII conformation in aqueous and fluorous media and at the water/vacuum interface. J Mol Graph Model 2015; 63:8-14. [PMID: 26606320 DOI: 10.1016/j.jmgm.2015.11.006] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2015] [Revised: 10/05/2015] [Accepted: 11/06/2015] [Indexed: 11/20/2022]
Abstract
Hydrophobins are proteins of interest for numerous applications thanks to their unique conformational and surface properties and their ability to self-assemble at interfaces. Here we report fully atomistic molecular mechanics and molecular dynamics results together with circular dichroism experimental data, aimed to study the conformational properties of the hydrophobin HFBII in a fluorinated solvent in comparison with a water solution and/or at an aqueous/vacuum interface. Both the atomistic simulations and the circular dichroism data show the remarkable structural stability of HFBII at all scales in all these environments, with no significant structural change, although a small cavity is formed in the fluorinated solvent. The combination of theoretical calculations and circular dichroism data can describe in detail the protein conformation and flexibility in different solvents and/or at an interface, and constitutes a first step towards the study of their self-assembly.
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19
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Bell RV, Rochford LA, de Rosales RTM, Stevens M, Weaver JVM, Bon SAF. Fabrication of calcium phosphate microcapsules using emulsion droplets stabilized with branched copolymers as templates. J Mater Chem B 2015; 3:5544-5552. [DOI: 10.1039/c5tb00893j] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
An efficient emulsion templating route using branched copolymers as droplet stabilizers for the synthesis of fluorescently labelled calcium phosphate capsules.
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Affiliation(s)
- Robert V. Bell
- Department of Chemistry
- University of Warwick
- Coventry CV4 7AL
- UK
- Department of Materials
| | | | | | - Molly Stevens
- Department of Materials
- Imperial College London
- London SW7 2AZ
- UK
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20
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Zhang S, Jiang Z, Zhang W, Wang X, Shi J. Polymer–inorganic microcapsules fabricated by combining biomimetic adhesion and bioinspired mineralization and their use for catalase immobilization. Biochem Eng J 2015. [DOI: 10.1016/j.bej.2014.10.021] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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21
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Hydrophobin film structure for HFBI and HFBII and mechanism for accelerated film formation. PLoS Comput Biol 2014; 10:e1003745. [PMID: 25079355 PMCID: PMC4117420 DOI: 10.1371/journal.pcbi.1003745] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2014] [Accepted: 06/12/2014] [Indexed: 11/24/2022] Open
Abstract
Hydrophobins represent an important group of proteins from both a biological and nanotechnological standpoint. They are the means through which filamentous fungi affect their environment to promote growth, and their properties at interfaces have resulted in numerous applications. In our study we have combined protein docking, molecular dynamics simulation, and electron cryo-microscopy to gain atomistic level insight into the surface structure of films composed of two class II hydrophobins: HFBI and HFBII produced by Trichoderma reesei. Together our results suggest a unit cell composed of six proteins; however, our computational results suggest P6 symmetry, while our experimental results show P3 symmetry with a unit cell size of 56 Å. Our computational results indicate the possibility of an alternate ordering with a three protein unit cell with P3 symmetry and a smaller unit cell size, and we have used a Monte Carlo simulation of a spin model representing the hydrophobin film to show how this alternate metastable structure may play a role in increasing the rate of surface coverage by hydrophobin films, possibly indicating a mechanism of more general significance to both biology and nanotechnology. Filamentous fungi release a specific type of protein, belonging to a protein family known as “hydrophobins” into their environment to control interfaces in a fashion that promotes growth. Such protein coatings are the mechanism that allows for the mycelia to grow out of the water and into the air. When these hydrophobins form films at the air-water interface and on the surface of solid objects immersed in water, they impart properties to those surfaces that has led to their use in a wide range of industrial applications. Of particular interest is the properties they impart to air liquid interfaces, and as a mechanism to bring protective materials to coat nanoparticles in nanotechnology applications. A more detailed knowledge of the structure of these surfaces will allow for augmentation of their function that is possible through genetic engineering of the hydrophobins themselves. In this study we have combined computational and experimental methods to develop atomistic level insight into the structure of this surface for two important hydrophobins: HFBI and HFBII of Trichoderma reesei. In addition to insight into the surface structure, we have uncovered an intriguing possible new mechanism for film formation, which may explain some of the striking properties of hydrophobin films, and could be extended to a more general mechanism.
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22
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Shi J, Jiang Y, Wang X, Wu H, Yang D, Pan F, Su Y, Jiang Z. Design and synthesis of organic–inorganic hybrid capsules for biotechnological applications. Chem Soc Rev 2014; 43:5192-210. [DOI: 10.1039/c4cs00108g] [Citation(s) in RCA: 127] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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23
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Heinonen H, Laaksonen P, Linder MB, Hentze HP. Engineered Hydrophobin for Biomimetic Mineralization of Functional Calcium Carbonate Microparticles. ACTA ACUST UNITED AC 2014. [DOI: 10.4236/jbnb.2014.51001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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24
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Wang H, Garakani TM, Krappitz T, van Rijn P, Böker A. Morphology control and surface functionalization of protein-SiO 2 hybrid capsules. J Mater Chem B 2013; 1:6427-6433. [PMID: 32261341 DOI: 10.1039/c3tb21013h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this contribution, we describe ways to introduce additional complexity and functionality to protein mediated capsule formation based on biomineralization in Pickering templated systems in order to enable possible post-mineralization modifications. Here the shell morphology is influenced by addition of ionic additives to the reaction system which significantly alters the surface structure. By changing the oil-phase (tetraethyl orthosilicate), even more complexity is introduced as well as reactive groups by adding (3-aminopropyl)trimethoxysilane to the oil phase. The incorporated amino-functionality is easily addressed via mild peptide coupling reaction.
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Affiliation(s)
- Huihui Wang
- DWI an der RWTH Aachen e.V., Lehrstuhl für Makromolekulare Materialien und Oberflächen, RWTH Aachen University, Forckenbeckstrasse 50, D-52056 Aachen, Germany.
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25
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Wang X, Shi J, Jiang Z, Li Z, Zhang W, Song X, Ai Q, Wu H. Preparation of Ultrathin, Robust Protein Microcapsules through Template-Mediated Interfacial Reaction between Amine and Catechol Groups. Biomacromolecules 2013; 14:3861-9. [DOI: 10.1021/bm400983a] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Xiaoli Wang
- Key
Laboratory for Green Chemical Technology of Ministry of Education,
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, People’s Republic of China
- Synergetic
Innovation Center of Chemical Science and Engineering, Tianjin 300072, People’s Republic of China
| | - Jiafu Shi
- Key
Laboratory for Green Chemical Technology of Ministry of Education,
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, People’s Republic of China
- Synergetic
Innovation Center of Chemical Science and Engineering, Tianjin 300072, People’s Republic of China
| | - Zhongyi Jiang
- Key
Laboratory for Green Chemical Technology of Ministry of Education,
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, People’s Republic of China
- National
Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China
- Synergetic
Innovation Center of Chemical Science and Engineering, Tianjin 300072, People’s Republic of China
| | - Zheng Li
- Key
Laboratory for Green Chemical Technology of Ministry of Education,
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, People’s Republic of China
| | - Wenyan Zhang
- Key
Laboratory for Green Chemical Technology of Ministry of Education,
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, People’s Republic of China
- Synergetic
Innovation Center of Chemical Science and Engineering, Tianjin 300072, People’s Republic of China
| | - Xiaokai Song
- Key
Laboratory for Green Chemical Technology of Ministry of Education,
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, People’s Republic of China
- Synergetic
Innovation Center of Chemical Science and Engineering, Tianjin 300072, People’s Republic of China
| | - Qinghong Ai
- Key
Laboratory for Green Chemical Technology of Ministry of Education,
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, People’s Republic of China
- Synergetic
Innovation Center of Chemical Science and Engineering, Tianjin 300072, People’s Republic of China
| | - Hong Wu
- Key
Laboratory for Green Chemical Technology of Ministry of Education,
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, People’s Republic of China
- Synergetic
Innovation Center of Chemical Science and Engineering, Tianjin 300072, People’s Republic of China
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26
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Bleek K, Taubert A. New developments in polymer-controlled, bioinspired calcium phosphate mineralization from aqueous solution. Acta Biomater 2013; 9:6283-321. [PMID: 23291492 DOI: 10.1016/j.actbio.2012.12.027] [Citation(s) in RCA: 143] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2012] [Revised: 11/13/2012] [Accepted: 12/21/2012] [Indexed: 11/19/2022]
Abstract
The polymer-controlled and bioinspired precipitation of inorganic minerals from aqueous solution at near-ambient or physiological conditions avoiding high temperatures or organic solvents is a key research area in materials science. Polymer-controlled mineralization has been studied as a model for biomineralization and for the synthesis of (bioinspired and biocompatible) hybrid materials for a virtually unlimited number of applications. Calcium phosphate mineralization is of particular interest for bone and dental repair. Numerous studies have therefore addressed the mineralization of calcium phosphate using a wide variety of low- and high-molecular-weight additives. In spite of the growing interest and increasing number of experimental and theoretical data, the mechanisms of polymer-controlled calcium phosphate mineralization are not entirely clear to date, although the field has made significant progress in the last years. A set of elegant experiments and calculations has shed light on some details of mineral formation, but it is currently not possible to preprogram a mineralization reaction to yield a desired product for a specific application. The current article therefore summarizes and discusses the influence of (macro)molecular entities such as polymers, peptides, proteins and gels on biomimetic calcium phosphate mineralization from aqueous solution. It focuses on strategies to tune the kinetics, morphologies, final dimensions and crystal phases of calcium phosphate, as well as on mechanistic considerations.
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Affiliation(s)
- Katrin Bleek
- Institute of Chemistry, University of Potsdam, D-14476 Potsdam, Germany
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27
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van Rijn P, Park H, Özlem Nazli K, Mougin NC, Böker A. Self-assembly process of soft ferritin-PNIPAAm conjugate bionanoparticles at polar-apolar interfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:276-284. [PMID: 23210639 DOI: 10.1021/la3042988] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We describe an in-depth investigation on the dynamics and assembly behavior at polar-apolar interfaces of ferritin-PNIPAAm conjugates (poly-N-isopropylacrylamide). The stabilization of oil-water interfaces by the modified ferritin was investigated by dynamic surface tension measurements and compared to the individual components of the bionanoparticle conjugate, namely, unmodified ferritin and pure PNIMAAm of similar molecular weight. It was found that the modified ferritin, even at a low particle concentration, rapidly reduces the interfacial tension. The difference in interfacial stabilization was also shown by cryo-scanning electron microscopy and scanning force microscopy, which displayed very different morphologies at the polar-apolar interface for the unmodified ferritin, pure PNIPAAm, and the ferritin-PNIPAAm conjugate, respectively. The self-assembly of the ferritin-PNIPAAm was further analyzed by cryo-transmission electron microscopy and fluorescence microscopy, for which a fluorescently labeled polymer was used. Both techniques revealed details on the assembly of the protein-polymer conjugate at the oil-water interface.
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Affiliation(s)
- Patrick van Rijn
- DWI an der RWTH Aachen e.V., Lehrstuhl für Makromolekulare Materialien und Oberflächen, RWTH Aachen University, Forckenbeckstrasse 50, D-52074 Aachen, Germany
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28
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Schulz A, Varnholt B, Liebeck BM, Richter MJ, Kreuels K, Subkowski T, Böker A. On the incorporation of functionalities into hydroxyapatite capsules. J Mater Chem B 2013; 1:1190-1198. [DOI: 10.1039/c3tb00373f] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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29
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Morris VK, Kwan AH, Sunde M. Analysis of the structure and conformational states of DewA gives insight into the assembly of the fungal hydrophobins. J Mol Biol 2012; 425:244-56. [PMID: 23137797 DOI: 10.1016/j.jmb.2012.10.021] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2012] [Revised: 10/10/2012] [Accepted: 10/30/2012] [Indexed: 11/19/2022]
Abstract
The hydrophobin DewA from the fungus Aspergillus nidulans is a highly surface-active protein that spontaneously self-assembles into amphipathic monolayers at hydrophobic:hydrophilic interfaces. These monolayers are composed of fibrils that are a form of functional amyloid. While there has been significant interest in the use of DewA for a variety of surface coatings and as an emulsifier in biotechnological applications, little is understood about the structure of the protein or the mechanism of self-assembly. We have solved the solution NMR structure of DewA. While the pattern of four disulfide bonds that is a defining feature of hydrophobins is conserved, the arrangement and composition of secondary-structure elements in DewA are quite different to what has been observed in other hydrophobin structures. In addition, we demonstrate that DewA populates two conformations in solution, both of which are assembly competent. One conformer forms a dimer at high concentrations, but this dimer is off-pathway to fibril formation and may represent an assembly control mechanism. These data highlight the structural differences between fibril-forming hydrophobins and those that form amorphous monolayers. This work will open up new opportunities for the engineering of hydrophobins with novel biotechnological applications.
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Affiliation(s)
- Vanessa K Morris
- School of Molecular Bioscience, University of Sydney, NSW 2006, Australia
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30
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Yang W, Ren Q, Wu YN, Morris VK, Rey AA, Braet F, Kwan AH, Sunde M. Surface functionalization of carbon nanomaterials by self-assembling hydrophobin proteins. Biopolymers 2012; 99:84-94. [DOI: 10.1002/bip.22146] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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31
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Genetic engineering in biomimetic composites. Trends Biotechnol 2012; 30:191-7. [DOI: 10.1016/j.tibtech.2012.01.001] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2011] [Revised: 01/02/2012] [Accepted: 01/03/2012] [Indexed: 11/22/2022]
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32
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Garakani TM, Wang H, Krappitz T, Liebeck BM, van Rijn P, Böker A. Lysozyme–silica hybrid materials: from nanoparticles to capsules and double emulsion mineral capsules. Chem Commun (Camb) 2012; 48:10210-2. [DOI: 10.1039/c2cc34576e] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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