51
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Ozgur B, Sayar M. Role of Hydrophobic/Aromatic Residues on the Stability of Double-Wall β-Sheet Structures Formed by a Triblock Peptide. J Phys Chem B 2017; 121:4115-4128. [PMID: 28399374 DOI: 10.1021/acs.jpcb.7b00650] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Bioinspired self-assembling peptides serve as powerful building blocks in the manufacturing of nanomaterials with tailored features. Because of their ease of synthesis, biocompatibility, and tunable activity, this emerging branch of biomolecules has become very popular. The triblock peptide architecture designed by the Hartgerink group is a versatile system that allows control over its assembly and has been shown to demonstrate tunable bioactivity. Three main forces, Coulomb repulsion, hydrogen bonding and hydrophobicity act together to guide the triblock peptides' assembly into one-dimensional objects and hydrogels. It was shown previously that both the nanofiber morphology (e.g., intersheet spacing, formation of antiparallel/parallel β-sheets) and hydrogel rheology strictly depend on the choice of the core residue where the triblock peptide fibers with aromatic cores in general form shorter fibers and yield poor hydrogels with respect to the ones with aliphatic cores. However, an elaborate understanding of the molecular reasons behind these changes remained unclear. In this study, by using carefully designed computer based free energy calculations, we analyzed the influence of the core residue on the formation of double-wall fibers and single-wall β-sheets. Our results demonstrate that the aromatic substitution impairs the fiber cores and this impairment is mainly associated with a reduced hydrophobic character of the aromatic side chains. Such weakening is most obvious in tryptophan containing peptides where the fiber core absorbs a significant amount of water. We also show that the ability of tyrosine to form side chain hydrogen bonds plays an indispensable role in the fiber stability. As opposed to the impairment of the fiber cores, single-wall β-sheets with aromatic faces become more stable compared to the ones with aliphatic faces suggesting that the choice of the core residue can also affect the underlying assembly mechanism. We also provide an in-depth comparison of competing structures (zero-dimensional aggregates, short and long fibers) in the triblock peptides' assembly and show that by adjusting the length of the terminal blocks, the fiber growth can be turned on or off while keeping the nanofiber morphology intact.
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Affiliation(s)
| | - Mehmet Sayar
- College of Engineering, Koc University , Istanbul, Turkey.,Chemical & Biological Engineering and Mechanical Engineering Departments, Koc University , Istanbul, Turkey
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52
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Yang J, Pan C, Sui X, Cai N, Zhang J, Zhu Y, Zhang L. The hypothermic preservation of mammalian cells with assembling extracellular-matrix-mimetic microparticles. J Mater Chem B 2017; 5:1535-1541. [DOI: 10.1039/c6tb03206k] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reversible assembly of magnetic alginate microparticles could mimic the extracellular matrix for efficient and facile hypothermic cell preservation.
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Affiliation(s)
- Jing Yang
- Department of Biochemical Engineering
- School of Chemical Engineering and Technology
- Tianjin University
- Tianjin 300072
- P. R. China
| | - Chao Pan
- Department of Biochemical Engineering
- School of Chemical Engineering and Technology
- Tianjin University
- Tianjin 300072
- P. R. China
| | - Xiaojie Sui
- Department of Biochemical Engineering
- School of Chemical Engineering and Technology
- Tianjin University
- Tianjin 300072
- P. R. China
| | - Nana Cai
- Department of Biochemical Engineering
- School of Chemical Engineering and Technology
- Tianjin University
- Tianjin 300072
- P. R. China
| | - Jiamin Zhang
- Department of Biochemical Engineering
- School of Chemical Engineering and Technology
- Tianjin University
- Tianjin 300072
- P. R. China
| | - Yingnan Zhu
- Department of Biochemical Engineering
- School of Chemical Engineering and Technology
- Tianjin University
- Tianjin 300072
- P. R. China
| | - Lei Zhang
- Department of Biochemical Engineering
- School of Chemical Engineering and Technology
- Tianjin University
- Tianjin 300072
- P. R. China
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53
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Xie Y, Zhao J, Huang R, Qi W, Wang Y, Su R, He Z. Calcium-Ion-Triggered Co-assembly of Peptide and Polysaccharide into a Hybrid Hydrogel for Drug Delivery. NANOSCALE RESEARCH LETTERS 2016; 11:184. [PMID: 27067732 PMCID: PMC4828348 DOI: 10.1186/s11671-016-1415-8] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2016] [Accepted: 04/04/2016] [Indexed: 05/04/2023]
Abstract
We report a new approach to constructing a peptide-polysaccharide hybrid hydrogel via the calcium-ion-triggered co-assembly of fluorenylmethyloxycarbonyl-diphenylalanine (Fmoc-FF) peptide and alginate. Calcium ions triggered the self-assembly of Fmoc-FF peptide into nanofibers with diameter of about 30 nm. Meanwhile, alginate was rapidly crosslinked by the calcium ions, leading to the formation of stable hybrid hydrogel beads. Compared to alginate or Fmoc-FF hydrogel alone, the hybrid Fmoc-FF/alginate hydrogel had much better stability in both water and a phosphate-buffered solution (PBS), probably because of the synergistic effect of noncovalent and ionic interactions. Furthermore, docetaxel was chosen as a drug model, and it was encapsulated by hydrogel beads to study the in vitro release behavior. The sustained and controlled docetaxel release was obtained by varying the concentration ratio between Fmoc-FF peptide and alginate.
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Affiliation(s)
- Yanyan Xie
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, People's Republic of China
| | - Jun Zhao
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, People's Republic of China
| | - Renliang Huang
- School of Environmental Science and Engineering, Tianjin University, Tianjin, 300072, People's Republic of China.
| | - Wei Qi
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, People's Republic of China.
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin, 300072, People's Republic of China.
- Tianjin Key Laboratory of Membrane Science and Desalination Technology, Tianjin University, Tianjin, 300072, People's Republic of China.
| | - Yuefei Wang
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, People's Republic of China
| | - Rongxin Su
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, People's Republic of China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin, 300072, People's Republic of China
- Tianjin Key Laboratory of Membrane Science and Desalination Technology, Tianjin University, Tianjin, 300072, People's Republic of China
| | - Zhimin He
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, People's Republic of China
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54
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Self-assembled cationic amphiphiles as antimicrobial peptides mimics: Role of hydrophobicity, linkage type, and assembly state. NANOMEDICINE-NANOTECHNOLOGY BIOLOGY AND MEDICINE 2016; 13:343-352. [PMID: 27520722 DOI: 10.1016/j.nano.2016.07.018] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2016] [Revised: 07/19/2016] [Accepted: 07/28/2016] [Indexed: 01/05/2023]
Abstract
Inspired by high promise using naturally occurring antimicrobial peptides (AMPs) to treat infections caused by antimicrobial-resistant bacteria, cationic amphiphiles (CAms) were strategically designed as synthetic mimics to overcome associated limitations, including high manufacture cost and low metabolic stability. CAms with facially amphiphilic conformation were expected to demonstrate membrane-lytic properties and thus reduce tendency of resistance development. By systematically tuning the hydrophobicity, CAms with optimized compositions exhibited potent broad-spectrum antimicrobial activity (with minimum inhibitory concentrations in low μg/mL range) as well as negligible hemolytic activity. Electron microscope images revealed the morphological and ultrastructure changes of bacterial membranes induced by CAm treatment and validated their membrane-disrupting mechanism. Additionally, an all-atom molecular dynamics simulation was employed to understand the CAm-membrane interaction on molecular level. This study shows that these CAms can serve as viable scaffolds for designing next generation of AMP mimics as antimicrobial alternatives to combat drug-resistant pathogens.
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55
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Shirbin SJ, Lam SJ, Chan NJA, Ozmen MM, Fu Q, O’Brien-Simpson N, Reynolds EC, Qiao GG. Polypeptide-Based Macroporous Cryogels with Inherent Antimicrobial Properties: The Importance of a Macroporous Structure. ACS Macro Lett 2016; 5:552-557. [PMID: 35632386 DOI: 10.1021/acsmacrolett.6b00174] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Synthetic polypeptide-based macroporous cryogels with inherent antimicrobial properties were prepared for potential water purification applications. Gels were chemically cross-linked through the amine residue of a polycationic polylysine-b-polyvaline block copolymer with glutaraldehyde as cross-linker under cryogenic conditions. These cryogels exhibited excellent water swelling and highly compressible mechanical properties owing to their macroporous structure. The antibacterial performance was evaluated based on E. coli viability, with cryogels exhibiting up to 95.6% reduction in viable E. coli after a brief 1 h incubation. In comparison to the hydrogel control, the presence of macropores is shown to be vital to the antimicrobial effect of the gels. The confined environment and increased antimicrobial surface area of the macropores is believed to result in a "trap and kill" mechanism. Mechanical strength and pore integrity of cryogels were also found to be determinants for antibacterial activity. Along with the lack of toxic leaching, these cryogels with inherent antimicrobial properties pose as potential candidates for use in biological and environmentally friendly water purification applications.
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Affiliation(s)
- Steven J. Shirbin
- Polymer
Science Group, Department of Chemical and Biomolecular Engineering, University of Melbourne, Parkville, Melbourne, Victoria 3010, Australia
| | - Shu J. Lam
- Polymer
Science Group, Department of Chemical and Biomolecular Engineering, University of Melbourne, Parkville, Melbourne, Victoria 3010, Australia
| | - Nicholas Jun-An Chan
- Polymer
Science Group, Department of Chemical and Biomolecular Engineering, University of Melbourne, Parkville, Melbourne, Victoria 3010, Australia
| | - Mehmet Murat Ozmen
- Polymer
Science Group, Department of Chemical and Biomolecular Engineering, University of Melbourne, Parkville, Melbourne, Victoria 3010, Australia
- Department
of Bioengineering, Yildiz Technical University, Esenler, 34220, Istanbul, Turkey
| | - Qiang Fu
- Polymer
Science Group, Department of Chemical and Biomolecular Engineering, University of Melbourne, Parkville, Melbourne, Victoria 3010, Australia
| | - Neil O’Brien-Simpson
- Melbourne
Dental School and The Bio21 Institute of Molecular Science and Biotechnology,
Oral Health CRC, The University of Melbourne, Parkville, VIC 3010, Australia
| | - Eric C. Reynolds
- Melbourne
Dental School and The Bio21 Institute of Molecular Science and Biotechnology,
Oral Health CRC, The University of Melbourne, Parkville, VIC 3010, Australia
| | - Greg G. Qiao
- Polymer
Science Group, Department of Chemical and Biomolecular Engineering, University of Melbourne, Parkville, Melbourne, Victoria 3010, Australia
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McCloskey AP, Gilmore S, Zhou J, Draper ER, Porter S, Gilmore BF, Xu B, Laverty G. Self-assembling ultrashort NSAID-peptide nanosponges: multifunctional antimicrobial and anti-inflammatory materials. RSC Adv 2016. [DOI: 10.1039/c6ra20282a] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
This paper outlines the design, synthesis and characterisation of innovative NSAID-peptide gelators which demonstrate antimicrobial and anti-inflammatory properties and have potential use as multifunctional materials for biomedical applications.
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Affiliation(s)
| | | | - J. Zhou
- Department of Chemistry
- Brandeis University
- Waltham
- USA
| | - E. R. Draper
- Department of Chemistry
- University of Liverpool
- Liverpool
- UK
| | - S. Porter
- School of Pharmacy
- Queen's University
- Belfast
- UK
| | | | - Bing Xu
- Department of Chemistry
- Brandeis University
- Waltham
- USA
| | - G. Laverty
- School of Pharmacy
- Queen's University
- Belfast
- UK
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