1
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Imiołek M, Winssinger N. Two-Helix Supramolecular Proteomimetic Binders Assembled via PNA-Assisted Disulfide Crosslinking. Chembiochem 2023; 24:e202200561. [PMID: 36349499 DOI: 10.1002/cbic.202200561] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2022] [Revised: 11/05/2022] [Indexed: 11/10/2022]
Abstract
Peptidic motifs folded in a defined conformation are able to inhibit protein-protein interactions (PPIs) covering large interfaces and as such they are biomedical molecules of interest. Mimicry of such natural structures with synthetically tractable constructs often requires complex scaffolding and extensive optimization to preserve the fidelity of binding to the target. Here, we present a novel proteomimetic strategy based on a 2-helix binding motif that is brought together by hybridization of peptide nucleic acids (PNA) and stabilized by a rationally positioned intermolecular disulfide crosslink. Using a solid phase synthesis approach (SPPS), the building blocks are easily accessible and such supramolecular peptide-PNA helical hybrids could be further coiled using precise templated chemistry. The elaboration of the structural design afforded high affinity SARS CoV-2 RBD (receptor binding domain) binders without interference with the underlying peptide sequence, creating a basis for a new architecture of supramolecular proteomimetics.
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Affiliation(s)
- Mateusz Imiołek
- Department of Organic Chemistry, Faculty of Science, NCCR Chemical Biology, University of Geneva, 1211, Geneva, Switzerland
| | - Nicolas Winssinger
- Department of Organic Chemistry, Faculty of Science, NCCR Chemical Biology, University of Geneva, 1211, Geneva, Switzerland
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2
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Suparpprom C, Vilaivan T. Perspectives on conformationally constrained peptide nucleic acid (PNA): insights into the structural design, properties and applications. RSC Chem Biol 2022; 3:648-697. [PMID: 35755191 PMCID: PMC9175113 DOI: 10.1039/d2cb00017b] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2022] [Accepted: 03/17/2022] [Indexed: 11/21/2022] Open
Abstract
Peptide nucleic acid or PNA is a synthetic DNA mimic that contains a sequence of nucleobases attached to a peptide-like backbone derived from N-2-aminoethylglycine. The semi-rigid PNA backbone acts as a scaffold that arranges the nucleobases in a proper orientation and spacing so that they can pair with their complementary bases on another DNA, RNA, or even PNA strand perfectly well through the standard Watson-Crick base-pairing. The electrostatically neutral backbone of PNA contributes to its many unique properties that make PNA an outstanding member of the xeno-nucleic acid family. Not only PNA can recognize its complementary nucleic acid strand with high affinity, but it does so with excellent specificity that surpasses the specificity of natural nucleic acids and their analogs. Nevertheless, there is still room for further improvements of the original PNA in terms of stability and specificity of base-pairing, direction of binding, and selectivity for different types of nucleic acids, among others. This review focuses on attempts towards the rational design of new generation PNAs with superior performance by introducing conformational constraints such as a ring or a chiral substituent in the PNA backbone. A large collection of conformationally rigid PNAs developed during the past three decades are analyzed and compared in terms of molecular design and properties in relation to structural data if available. Applications of selected modified PNA in various areas such as targeting of structured nucleic acid targets, supramolecular scaffold, biosensing and bioimaging, and gene regulation will be highlighted to demonstrate how the conformation constraint can improve the performance of the PNA. Challenges and future of the research in the area of constrained PNA will also be discussed.
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Affiliation(s)
- Chaturong Suparpprom
- Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Naresuan University, Tah-Poe District, Muang Phitsanulok 65000 Thailand
- Organic Synthesis Research Unit, Department of Chemistry, Faculty of Science, Chulalongkorn University Phayathai Road Pathumwan Bangkok 10330 Thailand
| | - Tirayut Vilaivan
- Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Naresuan University, Tah-Poe District, Muang Phitsanulok 65000 Thailand
- Organic Synthesis Research Unit, Department of Chemistry, Faculty of Science, Chulalongkorn University Phayathai Road Pathumwan Bangkok 10330 Thailand
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3
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Sabale PM, Imiołek M, Raia P, Barluenga S, Winssinger N. Suprastapled Peptides: Hybridization-Enhanced Peptide Ligation and Enforced α-Helical Conformation for Affinity Selection of Combinatorial Libraries. J Am Chem Soc 2021; 143:18932-18940. [PMID: 34739233 DOI: 10.1021/jacs.1c07013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Stapled peptides with an enforced α-helical conformation have been shown to overcome major limitations in the development of short peptides targeting protein-protein interactions (PPIs). While the growing arsenal of methodologies to staple peptides facilitates their preparation, stapling methodologies are not broadly embraced in synthetic library screening. Herein, we report a strategy leveraged on hybridization of short PNA-peptide conjugates wherein nucleobase driven assembly facilitates ligation of peptide fragments and constrains the peptide's conformation into an α-helix. Using native chemical ligation, we show that a mixture of peptide fragments can be combinatorially ligated and used directly in affinity selection against a target of interest. This approach was exemplified with a focused library targeting the p-53/MDM2 interaction. One hundred peptides were obtained in a one-pot ligation reaction, selected by affinity against MDM2 immobilized on beads, and the best binders were identified by mass spectrometry.
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Affiliation(s)
- Pramod M Sabale
- Faculty of Science, NCCR Chemical Biology, University of Geneva, 30 Quai Ernest Ansermet, CH-1205 Geneva, Switzerland
| | - Mateusz Imiołek
- Faculty of Science, NCCR Chemical Biology, University of Geneva, 30 Quai Ernest Ansermet, CH-1205 Geneva, Switzerland
| | - Pierre Raia
- Faculty of Science, NCCR Chemical Biology, University of Geneva, 30 Quai Ernest Ansermet, CH-1205 Geneva, Switzerland
| | - Sofia Barluenga
- Faculty of Science, NCCR Chemical Biology, University of Geneva, 30 Quai Ernest Ansermet, CH-1205 Geneva, Switzerland
| | - Nicolas Winssinger
- Faculty of Science, NCCR Chemical Biology, University of Geneva, 30 Quai Ernest Ansermet, CH-1205 Geneva, Switzerland
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4
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5
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Jwad R, Weissberger D, Hunter L. Strategies for Fine-Tuning the Conformations of Cyclic Peptides. Chem Rev 2020; 120:9743-9789. [PMID: 32786420 DOI: 10.1021/acs.chemrev.0c00013] [Citation(s) in RCA: 55] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Cyclic peptides are promising scaffolds for drug development, attributable in part to their increased conformational order compared to linear peptides. However, when optimizing the target-binding or pharmacokinetic properties of cyclic peptides, it is frequently necessary to "fine-tune" their conformations, e.g., by imposing greater rigidity, by subtly altering certain side chain vectors, or by adjusting the global shape of the macrocycle. This review systematically examines the various types of structural modifications that can be made to cyclic peptides in order to achieve such conformational control.
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Affiliation(s)
- Rasha Jwad
- Department of Chemistry, College of Science, Al-Nahrain University, Baghdad, Iraq
| | - Daniel Weissberger
- School of Chemistry, University of New South Wales (UNSW) Sydney, New South Wales 2052, Australia
| | - Luke Hunter
- School of Chemistry, University of New South Wales (UNSW) Sydney, New South Wales 2052, Australia
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6
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Fang GM, Chen XX, Yang QQ, Zhu LJ, Li NN, Yu HZ, Meng XM. Discovery, structure, and chemical synthesis of disulfide-rich peptide toxins and their analogs. CHINESE CHEM LETT 2018. [DOI: 10.1016/j.cclet.2018.02.002] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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7
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Sayers J, Payne RJ, Winssinger N. Peptide nucleic acid-templated selenocystine-selenoester ligation enables rapid miRNA detection. Chem Sci 2017; 9:896-903. [PMID: 29629156 PMCID: PMC5873163 DOI: 10.1039/c7sc02736b] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2017] [Accepted: 11/21/2017] [Indexed: 12/31/2022] Open
Abstract
The development of a rapid and chemoselective selenocystine-selenoester peptide ligation that operates at nanomolar reactant concentrations has been developed by utilising PNA templation. Kinetic analysis of the templated peptide ligation revealed that the selenocystine-selenoester reaction was 10 times faster than traditional native chemical ligation at cysteine and to our knowledge is the fastest templated ligation reaction reported to date. The efficiency and operational simplicity of this technology is highlighted through the formation of hairpin molecular architectures and in a novel paper-based lateral flow assay for the rapid and sequence specific detection of oligonucleotides, including miRNA in cell lysates.
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Affiliation(s)
- Jessica Sayers
- School of Chemistry , The University of Sydney , Sydney , NSW 2006 , Australia . .,Department of Organic Chemistry , Faculty of Science , NCCR Chemical Biology , University of Geneva , Quai Ernest Ansermet 30 , 1211 Geneva , Switzerland .
| | - Richard J Payne
- School of Chemistry , The University of Sydney , Sydney , NSW 2006 , Australia .
| | - Nicolas Winssinger
- Department of Organic Chemistry , Faculty of Science , NCCR Chemical Biology , University of Geneva , Quai Ernest Ansermet 30 , 1211 Geneva , Switzerland .
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8
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In-cell production of a genetically-encoded library based on the θ-defensin RTD-1 using a bacterial expression system. Bioorg Med Chem 2017; 26:1212-1219. [PMID: 28927803 DOI: 10.1016/j.bmc.2017.09.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2017] [Revised: 09/01/2017] [Accepted: 09/05/2017] [Indexed: 02/08/2023]
Abstract
We report the high-yield heterologous expression of bioactive θ-defensin RTD-1 inside Escherichia coli cells by making use of intracellular protein trans-splicing in combination with a high efficient split-intein. RTD-1 is a small backbone-cyclized polypeptide with three disulfide bridges and a natural inhibitor of anthrax lethal factor protease. Recombinant RTD-1 was natively folded and able to inhibit anthrax lethal factor protease. In-cell expression of RTD-1 was very efficient and yielded ≈0.7mg of folded RTD-1 per gram of wet E. coli cells. This approach was used to generate of a genetically-encoded RTD-1-based peptide library in live E. coli cells. These results clearly demonstrate the possibility of using genetically-encoded RTD-1-based peptide libraries in live E. coli cells, which is a critical first step for developing in-cell screening and directed evolution technologies using the cyclic peptide RTD-1asa molecular scaffold.
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9
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Saarbach J, Masi D, Zambaldo C, Winssinger N. Facile access to modified and functionalized PNAs through Ugi-based solid phase oligomerization. Bioorg Med Chem 2017. [PMID: 28624242 DOI: 10.1016/j.bmc.2017.05.064] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Peptide nucleic acids (PNAs) derivatized with functional molecules are increasingly used in diverse biosupramolecular applications. PNAs have proven to be highly tolerant to modifications and different applications benefit from the use of modified PNAs, in particular modifications at the γ position. Herein we report simple protocols to access modified PNAs from iterative Ugi couplings which allow modular modifications at the α, β or γ position of the PNA backbone from simple starting materials. We demonstrate the utility of the method with the synthesis of several bioactive small molecules (a peptide ligand, a kinase inhibitor and a glycan)-PNA conjugates.
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Affiliation(s)
- Jacques Saarbach
- Faculty of Science, Department of Organic Chemistry, NCCR Chemical Biology, University of Geneva, 30 quai Ernest Ansermet, Geneva, Switzerland
| | - Daniela Masi
- Faculty of Science, Department of Organic Chemistry, NCCR Chemical Biology, University of Geneva, 30 quai Ernest Ansermet, Geneva, Switzerland
| | - Claudio Zambaldo
- Faculty of Science, Department of Organic Chemistry, NCCR Chemical Biology, University of Geneva, 30 quai Ernest Ansermet, Geneva, Switzerland
| | - Nicolas Winssinger
- Faculty of Science, Department of Organic Chemistry, NCCR Chemical Biology, University of Geneva, 30 quai Ernest Ansermet, Geneva, Switzerland.
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10
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Chen SQ, Xu L, He C, Li PY, Lu XX, Li JM, Li HJ, He WD, Yang L. Long-subchain hyperbranched poly(aminoethyl acrylate): A potent antimicrobial polymer with low hemolytic toxicity. ACTA ACUST UNITED AC 2016. [DOI: 10.1002/pola.28236] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Sheng-Qi Chen
- CAS Key Laboratory of Soft Matter Chemistry; University of Science and Technology of China; Hefei Anhui 230026 China
- Department of Polymer Science and Engineering; University of Science and Technology of China; Hefei Anhui 230026 China
| | - Lulu Xu
- CAS Key Laboratory of Soft Matter Chemistry; University of Science and Technology of China; Hefei Anhui 230026 China
- Department of Materials Science and Engineering; University of Science and Technology of China; Hefei Anhui 230026 China
| | - Chen He
- CAS Key Laboratory of Soft Matter Chemistry; University of Science and Technology of China; Hefei Anhui 230026 China
- Department of Polymer Science and Engineering; University of Science and Technology of China; Hefei Anhui 230026 China
| | - Peng-Yun Li
- CAS Key Laboratory of Soft Matter Chemistry; University of Science and Technology of China; Hefei Anhui 230026 China
- Department of Polymer Science and Engineering; University of Science and Technology of China; Hefei Anhui 230026 China
| | - Xiao-Xia Lu
- CAS Key Laboratory of Soft Matter Chemistry; University of Science and Technology of China; Hefei Anhui 230026 China
- Department of Polymer Science and Engineering; University of Science and Technology of China; Hefei Anhui 230026 China
| | - Jia-Min Li
- CAS Key Laboratory of Soft Matter Chemistry; University of Science and Technology of China; Hefei Anhui 230026 China
- Department of Polymer Science and Engineering; University of Science and Technology of China; Hefei Anhui 230026 China
| | - Hui-Juan Li
- CAS Key Laboratory of Soft Matter Chemistry; University of Science and Technology of China; Hefei Anhui 230026 China
- Department of Polymer Science and Engineering; University of Science and Technology of China; Hefei Anhui 230026 China
| | - Wei-Dong He
- CAS Key Laboratory of Soft Matter Chemistry; University of Science and Technology of China; Hefei Anhui 230026 China
- Department of Polymer Science and Engineering; University of Science and Technology of China; Hefei Anhui 230026 China
| | - Lihua Yang
- CAS Key Laboratory of Soft Matter Chemistry; University of Science and Technology of China; Hefei Anhui 230026 China
- Department of Polymer Science and Engineering; University of Science and Technology of China; Hefei Anhui 230026 China
- Department of Materials Science and Engineering; University of Science and Technology of China; Hefei Anhui 230026 China
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11
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Machida T, Dutt S, Winssinger N. Allosterically Regulated Phosphatase Activity from Peptide-PNA Conjugates Folded Through Hybridization. Angew Chem Int Ed Engl 2016; 55:8595-8. [PMID: 27320214 DOI: 10.1002/anie.201602751] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2016] [Revised: 05/10/2016] [Indexed: 01/17/2023]
Abstract
The importance of spatial organization in short peptide catalysts is well recognized. We synthesized and screened a library of peptides flanked by peptide nucleic acids (PNAs) such that the peptide would be constrained in a hairpin loop upon hybridization. A screen for phosphatase activity led to the discovery of a catalyst with >25-fold rate acceleration over the linear peptide. We demonstrated that the hybridization-enforced folding of the peptide is necessary for activity, and designed a catalyst that is allosterically controlled using a complementary PNA sequence.
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Affiliation(s)
- Takuya Machida
- Department of Organic Chemistry, NCCR Chemical Biology, University of Geneva, Quai Ernest Ansermet 30, 1211, Geneva, Switzerland
| | - Som Dutt
- Department of Organic Chemistry, NCCR Chemical Biology, University of Geneva, Quai Ernest Ansermet 30, 1211, Geneva, Switzerland
| | - Nicolas Winssinger
- Department of Organic Chemistry, NCCR Chemical Biology, University of Geneva, Quai Ernest Ansermet 30, 1211, Geneva, Switzerland.
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12
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Machida T, Dutt S, Winssinger N. Allosterically Regulated Phosphatase Activity from Peptide–PNA Conjugates Folded Through Hybridization. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201602751] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Takuya Machida
- Department of Organic Chemistry, NCCR Chemical Biology University of Geneva Quai Ernest Ansermet 30 1211 Geneva Switzerland
| | - Som Dutt
- Department of Organic Chemistry, NCCR Chemical Biology University of Geneva Quai Ernest Ansermet 30 1211 Geneva Switzerland
| | - Nicolas Winssinger
- Department of Organic Chemistry, NCCR Chemical Biology University of Geneva Quai Ernest Ansermet 30 1211 Geneva Switzerland
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13
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Xie Y, Yang L. Calcium and Magnesium Ions Are Membrane-Active against Stationary-Phase Staphylococcus aureus with High Specificity. Sci Rep 2016; 6:20628. [PMID: 26865182 PMCID: PMC4749956 DOI: 10.1038/srep20628] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2015] [Accepted: 01/06/2016] [Indexed: 11/09/2022] Open
Abstract
Staphylococcus aureus (S. aureus) is notorious for its ability to acquire antibiotic-resistance, and antibiotic-resistant S. aureus has become a wide-spread cause of high mortality rate. Novel antimicrobials capable of eradicating S. aureus cells including antibiotic-resistant ones are thus highly desired. Membrane-active bactericides and species-specific antimicrobials are two promising sources of novel anti-infective agents for fighting against bacterial antibiotic-resistance. We herein show that Ca2+ and Mg2+, two alkaline-earth-metal ions physiologically essential for diverse living organisms, both disrupt model S. aureus membranes and kill stationary-phase S. aureus cells, indicative of membrane-activity. In contrast to S. aureus, Escherichia coli and Bacillus subtilis exhibit unaffected survival after similar treatment with these two cations, indicative of species-specific activity against S. aureus. Moreover, neither Ca2+ nor Mg2+ lyses mouse red blood cells, indicative of hemo-compatibility. This works suggests that Ca2+ and Mg2+ may have implications in targeted eradication of S. aureus pathogen including the antibiotic-resistant ones.
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Affiliation(s)
- Yuntao Xie
- CAS Key Laboratory of Soft Matter Chemistry, University of Science and Technology of China, Hefei, Anhui 230026 China.,Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, Anhui 230026 China
| | - Lihua Yang
- CAS Key Laboratory of Soft Matter Chemistry, University of Science and Technology of China, Hefei, Anhui 230026 China.,Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, Anhui 230026 China.,Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei, Anhui 230026 China
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14
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Xu L, He C, Hui L, Xie Y, Li JM, He WD, Yang L. Bactericidal Dendritic Polycation Cloaked with Stealth Material via Lipase-Sensitive Intersegment Acquires Neutral Surface Charge without Losing Membrane-Disruptive Activity. ACS APPLIED MATERIALS & INTERFACES 2015; 7:27602-27607. [PMID: 26632646 DOI: 10.1021/acsami.5b09581] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Net cationicity of membrane-disruptive antimicrobials is necessary for their activity but may elicit immune attack when administered intravenously. By cloaking a dendritic polycation (G2) with poly(caprolactone-b-ethylene glycol) (PCL-b-PEG), we obtain a nanoparticle antimicrobial, G2-g-(PCL-b-PEG), which exhibits neutral surface charge but kills >99.9% of inoculated bacterial cells at ≤8 μg/mL. The observed activity may be attributed PCL's responsive degradation by bacterial lipase and the consequent exposure of the membrane-disruptive, bactericidal G2 core. Moreover, G2-g-(PCL-b-PEG) exhibits good colloidal stability in the presence of serum and insignificant hemolytic toxicity even at ≥2048 μg/mL. suggesting good blood compatibility required for intravenous administration.
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Affiliation(s)
- Lulu Xu
- CAS Key Laboratory of Soft Matter Chemistry, §School of Chemistry and Materials Science, and ⊥CAS Key Laboratory of Materials for Energy Conversion, University of Science and Technology of China , Hefei, Anhui 230026, China
| | - Chen He
- CAS Key Laboratory of Soft Matter Chemistry, §School of Chemistry and Materials Science, and ⊥CAS Key Laboratory of Materials for Energy Conversion, University of Science and Technology of China , Hefei, Anhui 230026, China
| | - Liwei Hui
- CAS Key Laboratory of Soft Matter Chemistry, §School of Chemistry and Materials Science, and ⊥CAS Key Laboratory of Materials for Energy Conversion, University of Science and Technology of China , Hefei, Anhui 230026, China
| | - Yuntao Xie
- CAS Key Laboratory of Soft Matter Chemistry, §School of Chemistry and Materials Science, and ⊥CAS Key Laboratory of Materials for Energy Conversion, University of Science and Technology of China , Hefei, Anhui 230026, China
| | - Jia-Min Li
- CAS Key Laboratory of Soft Matter Chemistry, §School of Chemistry and Materials Science, and ⊥CAS Key Laboratory of Materials for Energy Conversion, University of Science and Technology of China , Hefei, Anhui 230026, China
| | - Wei-Dong He
- CAS Key Laboratory of Soft Matter Chemistry, §School of Chemistry and Materials Science, and ⊥CAS Key Laboratory of Materials for Energy Conversion, University of Science and Technology of China , Hefei, Anhui 230026, China
| | - Lihua Yang
- CAS Key Laboratory of Soft Matter Chemistry, §School of Chemistry and Materials Science, and ⊥CAS Key Laboratory of Materials for Energy Conversion, University of Science and Technology of China , Hefei, Anhui 230026, China
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15
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Hui L, Auletta JT, Huang Z, Chen X, Xia F, Yang S, Liu H, Yang L. Surface Disinfection Enabled by a Layer-by-Layer Thin Film of Polyelectrolyte-Stabilized Reduced Graphene Oxide upon Solar Near-Infrared Irradiation. ACS APPLIED MATERIALS & INTERFACES 2015; 7:10511-7. [PMID: 25906148 DOI: 10.1021/acsami.5b02008] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
We report an antibacterial surface that kills airborne bacteria on contact upon minutes of solar near-infrared (NIR) irradiation. This antibacterial surface employs reduced graphene oxide (rGO), a well-known near-infrared photothermal conversion agent, as the photosensitizer and is prepared by assembling oppositely charged polyelectrolyte-stabilized rGO sheets (PEL-rGO) on a quartz substrate with the layer-by-layer (LBL) technique. Upon solar irradiation, the resulting PEL-rGO LBL multilayer efficiently generates rapid localized heating and, within minutes, kills >90% airborne bacteria, including antibiotic-tolerant persisters, on contact, likely by permeabilizing their cellular membranes. The observed activity is retained even when the PEL-rGO LBL multilayer is placed underneath a piece of 3 mm thick pork tissue, indicating that solar light in the near-infrared region plays dominant roles in the observed activity. This work may pave the way toward NIR-light-activated antibacterial surfaces, and our PEL-rGO LBL multilayer may be a novel surface coating material for conveniently disinfecting biomedical implants and common objects touched by people in daily life in the looming postantibiotic era with only minutes of solar exposure.
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Affiliation(s)
| | - Jeffrey T Auletta
- §Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | | | | | | | | | - Haitao Liu
- §Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
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16
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Hui L, Piao JG, Auletta J, Hu K, Zhu Y, Meyer T, Liu H, Yang L. Availability of the basal planes of graphene oxide determines whether it is antibacterial. ACS APPLIED MATERIALS & INTERFACES 2014; 6:13183-90. [PMID: 25026597 DOI: 10.1021/am503070z] [Citation(s) in RCA: 89] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
There are significant controversies on the antibacterial properties of graphene oxide (GO): GO was reported to be bactericidal in saline, whereas its activity in nutrient broth was controversial. To unveil the mechanisms underlying these contradictions, we performed antibacterial assays under comparable conditions. In saline, bare GO sheets were intrinsically bactericidal, yielding a bacterial survival percentage of <1% at 200 μg/mL. Supplementing saline with ≤10% Luria-Bertani (LB) broth, however, progressively deactivated its bactericidal activity depending on LB-supplementation ratio. Supplementation of 10% LB made GO completely inactive; instead, ∼100-fold bacterial growth was observed. Atomic force microscopy images showed that certain LB components were adsorbed on GO basal planes. Using bovine serum albumin and tryptophan as well-defined model adsorbates, we found that noncovalent adsorption on GO basal planes may account for the deactivation of GO's bactericidal activity. Moreover, this deactivation mechanism was shown to be extrapolatable to GO's cytotoxicity against mammalian cells. Taken together, our observations suggest that bare GO intrinsically kills both bacteria and mammalian cells and noncovalent adsorption on its basal planes may be a global deactivation mechanism for GO's cytotoxicity.
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Affiliation(s)
- Liwei Hui
- CAS Key Laboratory of Materials for Energy Conversion, ‡Department of Materials Science and Engineering, §CAS Key Laboratory of Soft Matter Chemistry, and ∥Department of Polymer Science and Engineering, University of Science and Technology of China , 96 Jinzhai Road, Hefei, Anhui 230026, China
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17
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Yang X, Hu K, Hu G, Shi D, Jiang Y, Hui L, Zhu R, Xie Y, Yang L. Long Hydrophilic-and-Cationic Polymers: A Different Pathway toward Preferential Activity against Bacterial over Mammalian Membranes. Biomacromolecules 2014; 15:3267-77. [DOI: 10.1021/bm5006596] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Xin Yang
- CAS Key Laboratory of Soft Matter
Chemistry, ¶Department of Materials Science and
Engineering, #Department of Polymer Science and Engineering, ⊥CAS Key Laboratory of Materials
for Energy Conversion, University of Science and Technology of China, Hefei, Anhui 230026 P.R. China
| | - Kan Hu
- CAS Key Laboratory of Soft Matter
Chemistry, ¶Department of Materials Science and
Engineering, #Department of Polymer Science and Engineering, ⊥CAS Key Laboratory of Materials
for Energy Conversion, University of Science and Technology of China, Hefei, Anhui 230026 P.R. China
| | - Guantai Hu
- CAS Key Laboratory of Soft Matter
Chemistry, ¶Department of Materials Science and
Engineering, #Department of Polymer Science and Engineering, ⊥CAS Key Laboratory of Materials
for Energy Conversion, University of Science and Technology of China, Hefei, Anhui 230026 P.R. China
| | - Danyao Shi
- CAS Key Laboratory of Soft Matter
Chemistry, ¶Department of Materials Science and
Engineering, #Department of Polymer Science and Engineering, ⊥CAS Key Laboratory of Materials
for Energy Conversion, University of Science and Technology of China, Hefei, Anhui 230026 P.R. China
| | - Yunjiang Jiang
- CAS Key Laboratory of Soft Matter
Chemistry, ¶Department of Materials Science and
Engineering, #Department of Polymer Science and Engineering, ⊥CAS Key Laboratory of Materials
for Energy Conversion, University of Science and Technology of China, Hefei, Anhui 230026 P.R. China
| | - Liwei Hui
- CAS Key Laboratory of Soft Matter
Chemistry, ¶Department of Materials Science and
Engineering, #Department of Polymer Science and Engineering, ⊥CAS Key Laboratory of Materials
for Energy Conversion, University of Science and Technology of China, Hefei, Anhui 230026 P.R. China
| | - Rui Zhu
- CAS Key Laboratory of Soft Matter
Chemistry, ¶Department of Materials Science and
Engineering, #Department of Polymer Science and Engineering, ⊥CAS Key Laboratory of Materials
for Energy Conversion, University of Science and Technology of China, Hefei, Anhui 230026 P.R. China
| | - Yuntao Xie
- CAS Key Laboratory of Soft Matter
Chemistry, ¶Department of Materials Science and
Engineering, #Department of Polymer Science and Engineering, ⊥CAS Key Laboratory of Materials
for Energy Conversion, University of Science and Technology of China, Hefei, Anhui 230026 P.R. China
| | - Lihua Yang
- CAS Key Laboratory of Soft Matter
Chemistry, ¶Department of Materials Science and
Engineering, #Department of Polymer Science and Engineering, ⊥CAS Key Laboratory of Materials
for Energy Conversion, University of Science and Technology of China, Hefei, Anhui 230026 P.R. China
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Abstract
Cyclic peptides are found in a diverse range of organisms and are characterized by their stability and role in defense. Why is only one class of cyclic peptides found in mammals? Possibly we have not looked hard enough for them, or the technologies needed to identify them are not fully developed. We also do not yet understand their intriguing biosynthesis from two separate gene products. Addressing these challenges will require the application of chemical tools and insights from other classes of cyclic peptides. Herein, we highlight recent developments in the characterization of theta defensins and describe the important role that chemistry has played in delineating their modes of action. Furthermore, we emphasize the potential of theta defensins as antimicrobial agents and scaffolds for peptide drug design.
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Affiliation(s)
- Anne C Conibear
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, 4072 QLD (Australia) http://www.imb.uq.edu.au/index.html?page=11695
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Abstract
PURPOSE OF REVIEW Defensins are a major family of antimicrobial peptides expressed predominantly in neutrophils and epithelial cells, and play important roles in innate immune defense against infectious pathogens. Their biological functions in and beyond innate immunity, structure and activity relationships, mechanisms of action, and therapeutic potential continue to be interesting research topics. This review examines recent progress in our understanding of alpha and theta-defensins - the two structural classes composed of members of myeloid origin. RECENT FINDINGS A novel mode of antibacterial action is described for human enteric alpha-defensin 6, which forms structured nanonets to entrap bacterial pathogens and protect against bacterial invasion of the intestinal epithelium. The functional multiplicity and mechanistic complexity of defensins under different experimental conditions contribute to a debate over the role of enteric alpha-defensins in mucosal immunity against HIV-1 infection. Contrary to common belief, hydrophobicity rather than cationicity plays a dominant functional role in the action of human alpha-defensins; hydrophobicity-mediated high-order assembly endows human alpha-defensins with an extraordinary ability to acquire structural diversity and functional versatility. Growing evidence suggests that theta-defensins offer the best opportunity for therapeutic development as a novel class of broadly active anti-infective and anti-inflammatory agents. SUMMARY Defensins are the 'Swiss army knife' in innate immunity against microbial pathogens. Their modes of action are often reminiscent of the story of 'The Blind Men and the Elephant'. The functional diversity and mechanistic complexity, as well as therapeutic potential of defensins, will continue to attract attention to this important family of antimicrobial peptides.
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Sadhu KK, Röthlingshöfer M, Winssinger N. DNA as a Platform to Program Assemblies with Emerging Functions in Chemical Biology. Isr J Chem 2013. [DOI: 10.1002/ijch.201200100] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Kalyan K. Sadhu
- Institut de Science et Ingénierie Supramoléculaires (ISIS – UMR 7006), Université de Strasbourg – CNRS, 8 allée Gaspard Monge, F67000 Strasbourg (France)
| | - Manuel Röthlingshöfer
- Institut de Science et Ingénierie Supramoléculaires (ISIS – UMR 7006), Université de Strasbourg – CNRS, 8 allée Gaspard Monge, F67000 Strasbourg (France)
| | - Nicolas Winssinger
- Institut de Science et Ingénierie Supramoléculaires (ISIS – UMR 7006), Université de Strasbourg – CNRS, 8 allée Gaspard Monge, F67000 Strasbourg (France)
- Department of Organic Chemistry, University of Geneva, 30 quai Ernest Ansermet, CH‐1211 Geneva 4 (Switzerland) phone: +41‐22‐379‐61‐05 fax: +41‐22‐379‐32‐15
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