101
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Mann JA, Dichtel WR. Improving the binding characteristics of tripodal compounds on single layer graphene. ACS NANO 2013; 7:7193-7199. [PMID: 23859629 DOI: 10.1021/nn402599x] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Graphene is an atomically thin, transparent, and conductive electrode material of interest for sensors and energy conversion and storage devices, among others. Fully realizing its potential will require robust and general methods to anchor active functionality onto its pristine basal plane. Such strategies should not utilize covalent bond formation, which disrupts the graphene's π-electron system, from which most of its desirable properties arise. We recently introduced a tripodal binding motif, which forms robust monolayers on graphene capable of immobilizing active proteins and preventing their denaturation. Here we describe structure-property relationships for a series of tripod binding groups with "feet" of different sizes. Each derivative adsorbs strongly (ΔGads ≈ -39 kJ mol(-1)) to graphene's basal plane, yet the resulting monolayers exhibit kinetic stabilities that vary over 2 orders of magnitude and molecular densities that vary by a factor of 2. This study identifies phenanthrene as a superior anchor relative to pyrene on the basis of its increased monolayer density and similar kinetic stability. We also demonstrate that varying the length of the methylene linkers between the feet and tripodal core does not affect binding substantially. These results represent the first demonstration of structure-property relationships in the assembly of molecular adsorbates on graphene and provide a paradigm for designing effective graphene binding motifs.
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Affiliation(s)
- Jason A Mann
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853-1301, United States
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102
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Akdim B, Pachter R, Kim SS, Naik RR, Walsh TR, Trohalaki S, Hong G, Kuang Z, Farmer BL. Electronic properties of a graphene device with peptide adsorption: insight from simulation. ACS APPLIED MATERIALS & INTERFACES 2013; 5:7470-7477. [PMID: 23869852 DOI: 10.1021/am401731c] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
In this work, to explain doping behavior of single-layer graphene upon HSSYWYAFNNKT (P1) and HSSAAAAFNNKT (P1-3A) adsorption in field-effect transistors (GFETs), we applied a combined computational approach, whereby peptide adsorption was modeled by molecular dynamics simulations, and the lowest energy configuration was confirmed by density functional theory calculations. On the basis of the resulting structures of the hybrid materials, electronic structure and transport calculations were investigated. We demonstrate that π-π stacking of the aromatic residues and proximate peptide backbone to the graphene surface in P1 have a role in the p-doping. These results are consistent with our experimental observation of the GFET's p-doping even after a 24-h annealing procedure. Upon substitution of three of the aromatic residues to Ala in (P1-3A), a considerable decrease from p-doping is observed experimentally, demonstrating n-doping as compared to the nonadsorbed device, yet not explained based on the atomistic MD simulation structures. To gain a qualitative understanding of P1-3A's adsorption over a longer simulation time, which may differ from aromatic amino acid residues' swift anchoring on the surface, we analyzed equilibrated coarse-grain simulations performed for 500 ns. Desorption of the Ala residues from the surface was shown computationally, which could in turn affect charge transfer, yet a full explanation of the mechanism of n-doping will require elucidation of differences between various aromatic residues as dependent on peptide composition, and inclusion of effects of the substrate and environment, to be considered in future work.
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Affiliation(s)
- Brahim Akdim
- Air Force Research Laboratory, Materials & Manufacturing Directorate, Wright-Patterson Air Force Base, Ohio 45433, United States.
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103
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A hierarchical coarse-grained (all-atom-to-all-residue) computer simulation approach: self-assembly of peptides. PLoS One 2013; 8:e70847. [PMID: 23967121 PMCID: PMC3742673 DOI: 10.1371/journal.pone.0070847] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2013] [Accepted: 06/24/2013] [Indexed: 11/19/2022] Open
Abstract
A hierarchical computational approach (all-atom residue to all-residue peptide) is introduced to study self-organizing structures of peptides as a function of temperature. A simulated residue-residue interaction involving all-atom description, analogous to knowledge-based analysis (with different input), is used as an input to a phenomenological coarse-grained interaction for large scales computer simulations. A set of short peptides P1 (1H 2S 3S 4Y 5W 6Y 7A 8F 9N 10N 11K 12T) is considered as an example to illustrate the utility. We find that peptides assemble rather fast into globular aggregates at low temperatures and disperse as random-coil at high temperatures. The specificity of the mass distribution of the self-assembly depends on the temperature and spatial lengths which are identified from the scaling of the structure factor. Analysis of energy and mobility profiles, gyration radius of peptide, and radial distribution function of the assembly provide insight into the multi-scale (intra- and inter-chain) characteristics. Thermal response of the global assembly with the simulated residue-residue interaction is consistent with that of the knowledge-based analysis despite expected quantitative differences.
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104
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Choi I, Kulkarni DD, Xu W, Tsitsilianis C, Tsukruk VV. Star polymer unimicelles on graphene oxide flakes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:9761-9769. [PMID: 23883114 DOI: 10.1021/la401597p] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We report the interfacial assembly of amphiphilic heteroarm star copolymers (PSnP2VPn and PSn(P2VP-b-PtBA)n (n = 28 arms)) on graphene oxide flakes at the air-water interface. Adsorption, spreading, and ordering of star polymer micelles on the surface of the basal plane and edge of monolayer graphene oxide sheets were investigated on a Langmuir trough. This interface-mediated assembly resulted in micelle-decorated graphene oxide sheets with uniform spacing and organized morphology. We found that the surface activity of solvated graphene oxide sheets enables star polymer surfactants to subsequently adsorb on the presuspended graphene oxide sheets, thereby producing a bilayer complex. The positively charged heterocyclic pyridine-containing star polymers exhibited strong affinity onto the basal plane and edge of graphene oxide, leading to a well-organized and long-range ordered discrete micelle assembly. The preferred binding can be related to the increased conformational entropy due to the reduction of interarm repulsion. The extent of coverage was tuned by controlling assembly parameters such as concentration and solvent polarity. The polymer micelles on the basal plane remained incompressible under lateral compression in contrast to ones on the water surface due to strongly repulsive confined arms on the polar surface of graphene oxide and a preventive barrier in the form of the sheet edges. The densely packed biphasic tile-like morphology was evident, suggesting the high interfacial stability and mechanically stiff nature of graphene oxide sheets decorated with star polymer micelles. This noncovalent assembly represents a facile route for the control and fabrication of graphene oxide-inclusive ultrathin hybrid films applicable for layered nanocomposites.
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Affiliation(s)
- Ikjun Choi
- School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245, United States
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105
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Bian S, Scott AM, Cao Y, Liang Y, Osuna S, Houk KN, Braunschweig AB. Covalently Patterned Graphene Surfaces by a Force-Accelerated Diels–Alder Reaction. J Am Chem Soc 2013; 135:9240-3. [DOI: 10.1021/ja4042077] [Citation(s) in RCA: 111] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Shudan Bian
- Department of Chemistry, University of Miami, Coral Gables, Florida 33146, United
States
| | - Amy M. Scott
- Department of Chemistry, University of Miami, Coral Gables, Florida 33146, United
States
| | - Yang Cao
- Department of Chemistry
and
Biochemistry, University of California, Los Angeles, Los Angeles, California 90095, United States
| | - Yong Liang
- Department of Chemistry
and
Biochemistry, University of California, Los Angeles, Los Angeles, California 90095, United States
| | - Sílvia Osuna
- Department of Chemistry
and
Biochemistry, University of California, Los Angeles, Los Angeles, California 90095, United States
| | - K. N. Houk
- Department of Chemistry
and
Biochemistry, University of California, Los Angeles, Los Angeles, California 90095, United States
| | - Adam B. Braunschweig
- Department of Chemistry, University of Miami, Coral Gables, Florida 33146, United
States
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106
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Jeon J, Lodge MS, Dawson BD, Ishigami M, Shewmaker F, Chen B. Superb resolution and contrast of transmission electron microscopy images of unstained biological samples on graphene-coated grids. Biochim Biophys Acta Gen Subj 2013; 1830:3807-15. [DOI: 10.1016/j.bbagen.2013.03.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2012] [Revised: 02/27/2013] [Accepted: 03/01/2013] [Indexed: 11/26/2022]
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107
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Yadav A, Mishra P. Dimers and trimers of polycyclic aromatic hydrocarbons as models of graphene bilayers and trilayers: enhanced electron density at the edges. Mol Phys 2013. [DOI: 10.1080/00268976.2013.800918] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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108
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Coyle BL, Rolandi M, Baneyx F. Carbon-binding designer proteins that discriminate between sp2- and sp3-hybridized carbon surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:4839-4846. [PMID: 23510486 PMCID: PMC3658162 DOI: 10.1021/la4000846] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Robust and simple strategies to directly functionalize graphene- and diamond-based nanostructures with proteins are of considerable interest for biologically-driven manufacturing, biosensing, and bioimaging. Here, we identify a new set of carbon-binding peptides that vary in overall hydrophobicity and charge and engineer two of these sequences (Car9 and Car15) within the framework of E. coli thioredoxin 1 (TrxA). We develop purification schemes to recover the resulting TrxA derivatives in a soluble form and conduct a detailed analysis of the mechanisms that underpin the interaction of the fusion proteins with carbonaceous surfaces. Although equilibrium quartz crystal microbalance measurements show that TrxA::Car9 and TrxA::Car15 have similar affinities for sp(2)-hybridized graphitic carbon (Kd = 50 and 90 nM, respectively), only the latter protein is capable of dispersing carbon nanotubes. Further investigation by surface plasmon resonance and atomic force microscopy reveals that TrxA::Car15 interacts with sp(2)-bonded carbon through a combination of hydrophobic and π-π interactions but that TrxA::Car9 exhibits a cooperative mode of binding that relies on a combination of electrostatics and weaker π stacking. Consequently, we find that TrxA::Car9 binds equally well to sp(2)- and sp(3)-bonded (diamondlike) carbon particles whereas TrxA::Car15 is capable of discriminating between the two carbon allotropes. Our results emphasize the importance of understanding both bulk and molecular recognition events when exploiting the adhesive properties of solid-binding peptides and proteins in technological applications.
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Affiliation(s)
- Brandon L. Coyle
- Department of Chemical Engineering, Box 351750, University of Washington, Seattle, WA 98195-1750
| | - Marco Rolandi
- Department of Materials Science and Engineering, Box 351750, University of Washington, Seattle, WA 98195-1750
| | - François Baneyx
- Department of Chemical Engineering, Box 351750, University of Washington, Seattle, WA 98195-1750
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109
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Affiliation(s)
- Xiangang Hu
- Key Laboratory of Pollution Processes and Environmental
Criteria (Ministry of Education), College of Environmental Science
and Engineering, Nankai University, Tianjin
300071, China
| | - Qixing Zhou
- Key Laboratory of Pollution Processes and Environmental
Criteria (Ministry of Education), College of Environmental Science
and Engineering, Nankai University, Tianjin
300071, China
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110
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Feng L, Wu L, Qu X. New horizons for diagnostics and therapeutic applications of graphene and graphene oxide. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2013; 25:168-86. [PMID: 23161646 DOI: 10.1002/adma.201203229] [Citation(s) in RCA: 418] [Impact Index Per Article: 38.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2012] [Indexed: 05/21/2023]
Abstract
Graphene, a one-atom-thick two-dimensional (2D) layer of sp(2) -bonded carbon, has received worldwide attention owing to its extraordinary physical and chemical properties. Recently, great efforts have been devoted to explore potential applications of graphene and its oxide in life science, especially in disease-related diagnostics, near-Infrared (NIR) phototherapy and imaging. Here we will introduce recent advances and new horizons in this area, and focus on the rising progress on NIR photothermal therapy for cancer and Alzheimer's disease (AD), human telomerase detection, stem cell proliferation and differentiation on graphene substrate, diagnosis of cancer cell and related biomarkers, drug/nucleotide/peptide delivery and cell imaging, which have not been comprehensively reviewed. We hope to provide an outlook to the applications of graphene and its oxide, especially on the new horizons in this field, and inspire broader interests across various disciplines.
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Affiliation(s)
- Lingyan Feng
- Division of Biological Inorganic Chemistry, State Key Laboratory of Rare Earth Resource Utilization, Laboratory of Chemical Biology, Changchun Institute of Applied Chemistry, Graduate School of the Chinese Academy of Sciences, Chinese Academy of Sciences, Changchun, Jilin 130022, China
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111
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Wright LB, Walsh TR. Efficient conformational sampling of peptides adsorbed onto inorganic surfaces: insights from a quartz binding peptide. Phys Chem Chem Phys 2013; 15:4715-26. [DOI: 10.1039/c3cp42921k] [Citation(s) in RCA: 71] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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112
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Zhang M, Mao X, Wang C, Zeng W, Zhang C, Li Z, Fang Y, Yang Y, Liang W, Wang C. The effect of graphene oxide on conformation change, aggregation and cytotoxicity of HIV-1 regulatory protein (Vpr). Biomaterials 2013; 34:1383-90. [DOI: 10.1016/j.biomaterials.2012.10.067] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2012] [Accepted: 10/28/2012] [Indexed: 10/27/2022]
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113
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Radic S, Geitner NK, Podila R, Käkinen A, Chen P, Ke PC, Ding F. Competitive binding of natural amphiphiles with graphene derivatives. Sci Rep 2013; 3:2273. [PMID: 23881402 PMCID: PMC3721079 DOI: 10.1038/srep02273] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2013] [Accepted: 07/05/2013] [Indexed: 12/16/2022] Open
Abstract
Understanding the transformation of graphene derivatives by natural amphiphiles is essential for elucidating the biological and environmental implications of this emerging class of engineered nanomaterials. Using rapid discrete-molecular-dynamics simulations, we examined the binding of graphene and graphene oxide with peptides, fatty acids, and cellulose, and complemented our simulations by experimental studies of Raman spectroscopy, FTIR, and UV-Vis spectrophotometry. Specifically, we established a connection between the differential binding and the conformational flexibility, molecular geometry, and hydrocarbon content of the amphiphiles. Importantly, our dynamics simulations revealed a Vroman-like competitive binding of the amphiphiles for the graphene oxide substrate. This study provides a mechanistic basis for addressing the transformation, evolution, transport, biocompatibility, and toxicity of graphene derivatives in living systems and the natural environment.
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Affiliation(s)
- Slaven Radic
- Department of Physics and Astronomy, COMSET, Clemson University, Clemson, South Carolina 29634, United States
| | - Nicholas K. Geitner
- Department of Physics and Astronomy, COMSET, Clemson University, Clemson, South Carolina 29634, United States
| | - Ramakrishna Podila
- Department of Physics and Astronomy, COMSET, Clemson University, Clemson, South Carolina 29634, United States
| | - Aleksandr Käkinen
- Laboratory of Environmental Toxicology, National Institute of Chemical Physics and Biophysics, Akadeemia tee 23, Tallinn 12618, Estonia
- Department of Chemical and Materials Technology, Tallinn University of Technology, Ehitajate tee 5, Tallinn 19086, Estonia
| | - Pengyu Chen
- Department of Physics and Astronomy, COMSET, Clemson University, Clemson, South Carolina 29634, United States
- Microsystems Technology and Science Laboratory, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Pu Chun Ke
- Department of Physics and Astronomy, COMSET, Clemson University, Clemson, South Carolina 29634, United States
| | - Feng Ding
- Department of Physics and Astronomy, COMSET, Clemson University, Clemson, South Carolina 29634, United States
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114
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Yang SH, Chung WJ, McFarland S, Lee SW. Assembly of bacteriophage into functional materials. CHEM REC 2012; 13:43-59. [PMID: 23280916 DOI: 10.1002/tcr.201200012] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2012] [Indexed: 12/11/2022]
Abstract
For the last decade, the fabrication of ordered structures of phage has been of great interest as a means of utilizing the outstanding biochemical properties of phage in developing useful materials. Combined with other organic/inorganic substances, it has been demonstrated that phage is a superior building block for fabricating various functional devices, such as the electrode in lithium-ion batteries, photovoltaic cells, sensors, and cell-culture supports. Although previous research has expanded the utility of phage when combined with genetic engineering, most improvements in device functionality have relied upon increases in efficiency owing to the compact, more densely packable unit size of phage rather than on the unique properties of the ordered nanostructures themselves. Recently, self-templating methods, which control both thermodynamic and kinetic factors during the deposition process, have opened up new routes to exploiting the ordered structural properties of hierarchically organized phage architectures. In addition, ordered phage films have exhibited unexpected functional properties, such as structural color and optical filtering. Structural colors or optical filtering from phage films can be used for optical phage-based sensors, which combine the structural properties of phage with target-specific binding motifs on the phage-coat proteins. This self-templating method may contribute not only to practical applications, but also provide insight into the fundamental study of biomacromolecule assembly in in vivo systems under complicated and dynamic conditions.
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Affiliation(s)
- Sung Ho Yang
- Department of Bioengineering, University of California, Berkeley, California 94720, USA
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115
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Kotikam V, Fernandes M, Kumar VA. Comparing the interactions of DNA, polyamide (PNA) and polycarbamate nucleic acid (PCNA) oligomers with graphene oxide (GO). Phys Chem Chem Phys 2012; 14:15003-6. [PMID: 23038211 DOI: 10.1039/c2cp42770b] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The fluorescently labelled short octameric oligothymine sequences of DNA, PNA and PCNA were used in fluorescence quenching studies in conjunction with dispersed graphene oxide. The measurable restoration of their fluorescence by complementary oligodeoxyadenylate was compared. This is the first study aimed at replacing the natural DNA probes with synthetic DNA mimics that show excellent properties in terms of formation of very strong duplexes with cDNA in addition to their stability towards proteases and nucleases.
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Affiliation(s)
- Venubabu Kotikam
- Organic Chemistry Division, CSIR-National Chemical Laboratory, Pune, 411008, India
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116
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Bulat FA, Burgess JS, Matis BR, Baldwin JW, Macaveiu L, Murray JS, Politzer P. Hydrogenation and Fluorination of Graphene Models: Analysis via the Average Local Ionization Energy. J Phys Chem A 2012; 116:8644-52. [DOI: 10.1021/jp3053604] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Felipe A. Bulat
- Fable Theory & Computation LLC, Washington, DC 20009, United States
| | - James S. Burgess
- U.S. Naval Research Laboratory, Washington, DC 20375, United States
| | - Bernard R. Matis
- U.S. Naval Research Laboratory, Washington, DC 20375, United States
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117
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Calvaresi M, Höfinger S, Zerbetto F. Local Ice Melting by an Antifreeze Protein. Biomacromolecules 2012; 13:2046-52. [DOI: 10.1021/bm300366f] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Matteo Calvaresi
- Dipartimento di
Chimica “G. Ciamician”, Università di Bologna, Via F. Selmi 2, 40126 Bologna, Italy
| | - Siegfried Höfinger
- Dipartimento di
Chimica “G. Ciamician”, Università di Bologna, Via F. Selmi 2, 40126 Bologna, Italy
- Department of Physics, Michigan Technological University, 1400
Townsend Drive, 49931 Houghton, Michigan, United States
| | - Francesco Zerbetto
- Dipartimento di
Chimica “G. Ciamician”, Università di Bologna, Via F. Selmi 2, 40126 Bologna, Italy
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118
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Khatayevich D, So CR, Hayamizu Y, Gresswell C, Sarikaya M. Controlling the surface chemistry of graphite by engineered self-assembled peptides. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:8589-93. [PMID: 22428620 PMCID: PMC3374047 DOI: 10.1021/la300268d] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
The systematic control over surface chemistry is a long-standing challenge in biomedical and nanotechnological applications for graphitic materials. As a novel approach, we utilize graphite-binding dodecapeptides that self-assemble into dense domains to form monolayer-thick long-range-ordered films on graphite. Specifically, the peptides are rationally designed through their amino acid sequences to predictably display hydrophilic and hydrophobic characteristics while maintaining their self-assembly capabilities on the solid substrate. The peptides are observed to maintain a high tolerance for sequence modification, allowing control over surface chemistry via their amino acid sequence. Furthermore, through a single-step coassembly of two differently designed peptides, we predictably and precisely tune the wettability of the resulting functionalized graphite surfaces from 44° to 83°. The modular molecular structures and predictable behavior of short peptides demonstrated here give rise to a novel platform for functionalizing graphitic materials that offers numerous advantages, including noninvasive modification of the substrate, biocompatible processing in an aqueous environment, and simple fusion with other functional biological molecules.
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119
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Polycyclic aromatic hydrocarbons as finite size models of graphene and graphene nanoribbons: Enhanced electron density edge effect. Chem Phys 2012. [DOI: 10.1016/j.chemphys.2012.04.005] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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120
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Abstract
The development of a miniaturized sensing platform tailored for sensitive and selective detection of a variety of biochemical analytes could offer transformative fundamental and technological opportunities. Due to their high surface-to-volume ratios, nanoscale materials are extremely sensitive sensors. Likewise, peptides represent robust substrates for selective recognition due to the potential for broad chemical diversity within their relatively compact size. Here we explore the possibilities of linking peptides to nanosensors for the selective detection of biochemical targets. Such systems raise a number of interesting fundamental challenges: What are the peptide sequences, and how can rational design be used to derive selective binders? What nanomaterials should be used, and what are some strategies for assembling hybrid nanosensors? What role does molecular modeling play in elucidating response mechanisms? What is the resulting performance of these sensors, in terms of sensitivity, selectivity, and response time? What are some potential applications? This Account will highlight our early attempts to address these research challenges. Specifically, we use natural peptide sequences or sequences identified from phage display as capture elements. The sensors are based on a variety of nanomaterials including nanowires, graphene, and carbon nanotubes. We couple peptides to the nanomaterial surfaces via traditional surface functionalization methods or self-assembly. Molecular modeling provides detailed insights into the hybrid nanostructure, as well as the sensor detection mechanisms. The peptide nanosensors can distinguish chemically camouflaged mixtures of vapors and detect chemical warfare agents with sensitivities as low as parts-per-billion levels. Finally, we anticipate future uses of this technology in biomedicine: for example, devices based on these sensors could detect disease from the molecular components in human breath. Overall, these results provide a novel platform for the development of highly sensitive and selective "nanoelectronic noses".
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Affiliation(s)
- Yue Cui
- Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey 08544, United States
- Department of Biological Engineering, Utah State University, Logan, Utah 84322, United States
| | - Sang N. Kim
- Air Force Research Laboratory, Materials & Manufacturing Directorate, Wright-Patterson Air Force Base, Dayton, Ohio 45433, United States
| | - Rajesh R. Naik
- Air Force Research Laboratory, Materials & Manufacturing Directorate, Wright-Patterson Air Force Base, Dayton, Ohio 45433, United States
| | - Michael C. McAlpine
- Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey 08544, United States
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121
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Katoch J, Kim SN, Kuang Z, Farmer BL, Naik RR, Tatulian SA, Ishigami M. Structure of a peptide adsorbed on graphene and graphite. NANO LETTERS 2012; 12:2342-2346. [PMID: 22471315 DOI: 10.1021/nl300286k] [Citation(s) in RCA: 76] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Noncovalent functionalization of graphene using peptides is a promising method for producing novel sensors with high sensitivity and selectivity. Here we perform atomic force microscopy, Raman spectroscopy, infrared spectroscopy, and molecular dynamics simulations to investigate peptide-binding behavior to graphene and graphite. We studied a dodecamer peptide identified with phage display to possess affinity for graphite. Optical spectroscopy reveals that the peptide forms secondary structures both in powder form and in an aqueous medium. The dominant structure in the powder form is α-helix, which undergoes a transition to a distorted helical structure in aqueous solution. The peptide forms a complex reticular structure upon adsorption on graphene and graphite, having a helical conformation different from α-helix due to its interaction with the surface. Our observation is consistent with our molecular dynamics calculations, and our study paves the way for rational functionalization of graphene using biomolecules with defined structures and, therefore, functionalities.
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Affiliation(s)
- Jyoti Katoch
- Department of Physics, University of Central Florida, Orlando, Florida 32816-2385, USA
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122
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Mannoor MS, Tao H, Clayton JD, Sengupta A, Kaplan DL, Naik RR, Verma N, Omenetto FG, McAlpine MC. Graphene-based wireless bacteria detection on tooth enamel. Nat Commun 2012; 3:763. [PMID: 22453836 DOI: 10.1038/ncomms1767] [Citation(s) in RCA: 454] [Impact Index Per Article: 37.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2011] [Accepted: 02/29/2012] [Indexed: 12/22/2022] Open
Abstract
Direct interfacing of nanosensors onto biomaterials could impact health quality monitoring and adaptive threat detection. Graphene is capable of highly sensitive analyte detection due to its nanoscale nature. Here we show that graphene can be printed onto water-soluble silk. This in turn permits intimate biotransfer of graphene nanosensors onto biomaterials, including tooth enamel. The result is a fully biointerfaced sensing platform, which can be tuned to detect target analytes. For example, via self-assembly of antimicrobial peptides onto graphene, we show bioselective detection of bacteria at single-cell levels. Incorporation of a resonant coil eliminates the need for onboard power and external connections. Combining these elements yields two-tiered interfacing of peptide-graphene nanosensors with biomaterials. In particular, we demonstrate integration onto a tooth for remote monitoring of respiration and bacteria detection in saliva. Overall, this strategy of interfacing graphene nanosensors with biomaterials represents a versatile approach for ubiquitous detection of biochemical targets.
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Affiliation(s)
- Manu S Mannoor
- Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey 08544, USA
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Coppage R, Slocik JM, Briggs BD, Frenkel AI, Naik RR, Knecht MR. Determining peptide sequence effects that control the size, structure, and function of nanoparticles. ACS NANO 2012; 6:1625-1636. [PMID: 22276921 DOI: 10.1021/nn204600d] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The ability to tune the size, shape, and composition of nanomaterials at length scales <10 nm remains a challenging task. Such capabilities are required to fully realize the application of nanotechnology for catalysis, energy storage, and biomedical technologies. Conversely, nature employs biomacromolecules such as proteins and peptides as highly specific nanoparticle ligands that demonstrate exacting precision over the particle morphology through controlling the biotic/abiotic interface. Here we demonstrate the ability to finely tune the size, surface structure, and functionality of single-crystal Pd nanoparticles between 2 and 3 nm using materials directing peptides. This was achieved by selectively altering the peptide sequence to change the binding motif, which in turn modifies the surface structure of the particles. The materials were fully characterized before and after reduction using atomically resolved spectroscopic and microscopic analyses, which indicated that the coordination environment prior to reduction significantly affects the structure of the final nanoparticles. Additionally, changes to the particle surface structure, as a function of peptide sequence, can allow for chloride ion coordination that alters the catalytic abilities of the materials for the C-C coupling Stille reaction. These results suggest that peptide-based approaches may be able to achieve control over the structure/function relationship of nanomaterials where the peptide sequence could be used to selectivity tune such capabilities.
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Affiliation(s)
- Ryan Coppage
- Department of Chemistry, University of Miami, 1301 Memorial Drive, Coral Gables, Florida 33146, United States
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Enhanced Electron Density Edge Effect in Polycyclic Aromatic Hydrocarbons as Finite Size Models of Graphene and Graphene Nanoribbons. NATIONAL ACADEMY SCIENCE LETTERS-INDIA 2012. [DOI: 10.1007/s40009-011-0009-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Liao T, Sun C, Sun Z, Du A, Hulicova-Jurcakova D, Smith SC. How to achieve maximum charge carrier loading on heteroatom-substituted graphene nanoribbon edges: density functional theory study. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm31445b] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Swaminathan S, Cui Y. Recognition of poly(dimethylsiloxane) with phage displayed peptides. RSC Adv 2012. [DOI: 10.1039/c2ra22137c] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Shen L, Bao N, Zhou Z, Prevelige PE, Gupta A. Materials design using genetically engineered proteins. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1jm12238j] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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