1
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Gonzalez BD, Forbrig E, Yao G, Kielb P, Mroginski MA, Hildebrandt P, Kozuch J. Cation Dependence of Enniatin B/Membrane-Interactions Assessed Using Surface-Enhanced Infrared Absorption (SEIRA) Spectroscopy. Chempluschem 2024:e202400159. [PMID: 38700478 DOI: 10.1002/cplu.202400159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2024] [Revised: 04/26/2024] [Accepted: 04/29/2024] [Indexed: 05/05/2024]
Abstract
Enniatins are mycotoxins with well-known antibacterial, antifungal, antihelmintic and antiviral activity, which have recently come to attention as potential mitochondriotoxic anticancer agents. The cytotoxicity of enniatins is traced back to ionophoric properties, in which the cyclodepsipeptidic structure results in enniatin:cation-complexes of various stoichiometries proposed as membrane-active species. In this work, we employed a combination of surface-enhanced infrared absorption (SEIRA) spectroscopy, tethered bilayer lipid membranes (tBLMs) and density functional theory (DFT)-based computational spectroscopy to monitor the cation-dependence (Mz+=Na+, K+, Cs+, Li+, Mg2+, Ca2+) on the mechanism of enniatin B (EB) incorporation into membranes and identify the functionally relevant EBn : Mz+ complexes formed. We find that Na+ promotes a cooperative incorporation, modelled via an autocatalytic mechanism and mediated by a distorted 2 : 1-EB2 : Na+ complex. K+ (and Cs+) leads to a direct but less efficient insertion into membranes due to the adoption of "ideal" EB2 : K+ sandwich complexes. In contrast, the presence of Li+, Mg2+, and Ca2+ causes a (partial) extraction of EB from the membrane via the formation of "belted" 1 : 1-EB : Mz+ complexes, which screen the cationic charge less efficiently. Our results point to a relevance of the cation dependence for the transport into the malignant cells where the mitochondriotoxic anticancer activity is exerted.
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Affiliation(s)
- Barbara Daiana Gonzalez
- Institut für Chemie, Technische Universität Berlin, Sekr. PC14, Straße des 17. Juni 135, D-10623, Berlin, Germany
| | - Enrico Forbrig
- Institut für Chemie, Technische Universität Berlin, Sekr. PC14, Straße des 17. Juni 135, D-10623, Berlin, Germany
| | - Guiyang Yao
- Institut für Chemie, Technische Universität Berlin, Straße des 17. Juni 124, D-10623, Berlin, Germany
| | - Patrycja Kielb
- Clausius Institut für Physikalische und Theoretische Chemie, Universität Bonn, Wegelerstr. 12, D-53115, Bonn, Germany
- Transdisciplinary Research Area', Building Blocks of Matter and Fundamental Interactions (TRA Matter), Universität Bonn, D-53115, Bonn, Germany
| | - Maria Andrea Mroginski
- Institut für Chemie, Technische Universität Berlin, Sekr. PC14, Straße des 17. Juni 135, D-10623, Berlin, Germany
| | - Peter Hildebrandt
- Institut für Chemie, Technische Universität Berlin, Sekr. PC14, Straße des 17. Juni 135, D-10623, Berlin, Germany
| | - Jacek Kozuch
- Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, D-14195, Berlin, Germany
- Forschungsbau SupraFAB, Freie Universität Berlin, Altensteinstr. 23a, D-14195, Berlin, Germany
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2
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Li J, Wu D, Li J, Zhou Y, Yan Z, Liang J, Zhang QY, Xia XH. Ultrasensitive Plasmon-Enhanced Infrared Spectroelectrochemistry. Angew Chem Int Ed Engl 2024; 63:e202319246. [PMID: 38191762 DOI: 10.1002/anie.202319246] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2023] [Revised: 01/05/2024] [Accepted: 01/08/2024] [Indexed: 01/10/2024]
Abstract
IR spectroelectrochemistry (EC-IR) is a cutting-edge operando method for exploring electrochemical reaction mechanisms. However, detection of interfacial molecules is challenged by the limited sensitivity of existing EC-IR platforms due to the lack of high-enhancement substrates. Here, we propose an innovative plasmon-enhanced infrared spectroelectrochemistry (EC-PEIRS) platform to overcome this sensitivity limitation. Plasmonic antennae with ultrahigh IR signal enhancement are electrically connected via monolayer graphene while preserving optical path integrity, serving as both the electrode and IR substrate. The [Fe(CN)6 ]3- /[Fe(CN)6 ]4- redox reaction and electrochemical CO2 reduction reaction (CO2 RR) are investigated on the EC-PEIRS platform with a remarkable signal enhancement. Notably, the enhanced IR signals enable a reconstruction of the electrochemical curve of the redox reactions and unveil the CO2 RR mechanism. This study presents a promising technique for boosting the in-depth understanding of interfacial events across diverse applications.
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Affiliation(s)
- Jin Li
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, China
| | - Dan Wu
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, China
| | - Jian Li
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, China
| | - Yue Zhou
- School of Environmental Science, Nanjing Xiaozhuang University, Nanjing, 210017, China
| | - Zhendong Yan
- College of Science, Nanjing Forestry University, Nanjing, 210037, China
| | - Jing Liang
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, China
| | - Qing-Ying Zhang
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, China
| | - Xing-Hua Xia
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, China
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3
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Li D, Xu C, Xie J, Lee C. Research Progress in Surface-Enhanced Infrared Absorption Spectroscopy: From Performance Optimization, Sensing Applications, to System Integration. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:2377. [PMID: 37630962 PMCID: PMC10458771 DOI: 10.3390/nano13162377] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2023] [Revised: 08/13/2023] [Accepted: 08/17/2023] [Indexed: 08/27/2023]
Abstract
Infrared absorption spectroscopy is an effective tool for the detection and identification of molecules. However, its application is limited by the low infrared absorption cross-section of the molecule, resulting in low sensitivity and a poor signal-to-noise ratio. Surface-Enhanced Infrared Absorption (SEIRA) spectroscopy is a breakthrough technique that exploits the field-enhancing properties of periodic nanostructures to amplify the vibrational signals of trace molecules. The fascinating properties of SEIRA technology have aroused great interest, driving diverse sensing applications. In this review, we first discuss three ways for SEIRA performance optimization, including material selection, sensitivity enhancement, and bandwidth improvement. Subsequently, we discuss the potential applications of SEIRA technology in fields such as biomedicine and environmental monitoring. In recent years, we have ushered in a new era characterized by the Internet of Things, sensor networks, and wearable devices. These new demands spurred the pursuit of miniaturized and consolidated infrared spectroscopy systems and chips. In addition, the rise of machine learning has injected new vitality into SEIRA, bringing smart device design and data analysis to the foreground. The final section of this review explores the anticipated trajectory that SEIRA technology might take, highlighting future trends and possibilities.
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Affiliation(s)
- Dongxiao Li
- Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117583, Singapore; (D.L.); (C.X.); (J.X.)
- Center for Intelligent Sensors and MEMS (CISM), National University of Singapore, Singapore 117608, Singapore
| | - Cheng Xu
- Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117583, Singapore; (D.L.); (C.X.); (J.X.)
- Center for Intelligent Sensors and MEMS (CISM), National University of Singapore, Singapore 117608, Singapore
| | - Junsheng Xie
- Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117583, Singapore; (D.L.); (C.X.); (J.X.)
- Center for Intelligent Sensors and MEMS (CISM), National University of Singapore, Singapore 117608, Singapore
| | - Chengkuo Lee
- Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117583, Singapore; (D.L.); (C.X.); (J.X.)
- Center for Intelligent Sensors and MEMS (CISM), National University of Singapore, Singapore 117608, Singapore
- NUS Suzhou Research Institute (NUSRI), Suzhou 215123, China
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4
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Temperini ME, Polito R, Intze A, Gillibert R, Berkmann F, Baldassarre L, Giliberti V, Ortolani M. A mid-infrared laser microscope for the time-resolved study of light-induced protein conformational changes. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2023; 94:064102. [PMID: 37862502 DOI: 10.1063/5.0136676] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Accepted: 05/26/2023] [Indexed: 10/22/2023]
Abstract
We have developed a confocal laser microscope operating in the mid-infrared range for the study of light-sensitive proteins, such as rhodopsins. The microscope features a co-aligned infrared and visible illumination path for the selective excitation and probing of proteins located in the IR focus only. An external-cavity tunable quantum cascade laser provides a wavelength tuning range (5.80-6.35 µm or 1570-1724 cm-1) suitable for studying protein conformational changes as a function of time delay after visible light excitation with a pulsed LED. Using cryogen-free detectors, the relative changes in the infrared absorption of rhodopsin thin films around 10-4 have been observed with a time resolution down to 30 ms. The measured full-width at half maximum of the Airy disk at λ = 6.08 µm in transmission mode with a confocal arrangement of apertures is 6.6 µm or 1.1λ. Dark-adapted sample replacement at the beginning of each photocycle is then enabled by exchanging the illuminated thin-film location with the microscope mapping stage synchronized to data acquisition and LED excitation and by averaging hundreds of time traces acquired in different nearby locations within a homogeneous film area. We demonstrate that this instrument provides crucial advantages for time-resolved IR studies of rhodopsin thin films with a slow photocycle. Time-resolved studies of inhomogeneous samples may also be possible with the presented instrument.
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Affiliation(s)
- Maria Eleonora Temperini
- Department of Physics, Sapienza University of Rome, Piazzale Aldo Moro 2, Rome 00185, Italy
- Center for Life Nano & Neuro Science CL2NS, Istituto Italiano di Tecnologia, Viale Regina Elena 291, Rome 00161, Italy
| | - Raffaella Polito
- Department of Physics, Sapienza University of Rome, Piazzale Aldo Moro 2, Rome 00185, Italy
| | - Antonia Intze
- Department of Physics, Sapienza University of Rome, Piazzale Aldo Moro 2, Rome 00185, Italy
- Center for Life Nano & Neuro Science CL2NS, Istituto Italiano di Tecnologia, Viale Regina Elena 291, Rome 00161, Italy
| | - Raymond Gillibert
- Department of Physics, Sapienza University of Rome, Piazzale Aldo Moro 2, Rome 00185, Italy
| | - Fritz Berkmann
- Department of Physics, Sapienza University of Rome, Piazzale Aldo Moro 2, Rome 00185, Italy
| | - Leonetta Baldassarre
- Department of Physics, Sapienza University of Rome, Piazzale Aldo Moro 2, Rome 00185, Italy
| | - Valeria Giliberti
- Center for Life Nano & Neuro Science CL2NS, Istituto Italiano di Tecnologia, Viale Regina Elena 291, Rome 00161, Italy
| | - Michele Ortolani
- Department of Physics, Sapienza University of Rome, Piazzale Aldo Moro 2, Rome 00185, Italy
- Center for Life Nano & Neuro Science CL2NS, Istituto Italiano di Tecnologia, Viale Regina Elena 291, Rome 00161, Italy
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5
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Kato M, Sano R, Yoshida N, Iwafuji M, Nishiyama Y, Oka S, Shinzawa-Itoh K, Nishida Y, Shintani Y, Yagi I. Effects of Interfacial Interactions on Electrocatalytic Activity of Cytochrome c Oxidase in Biomimetic Lipid Membranes on Gold Electrodes. J Phys Chem Lett 2022; 13:9165-9170. [PMID: 36166647 DOI: 10.1021/acs.jpclett.2c01765] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Effects of interfacial interactions on the electrocatalytic activity of protein-tethered bilayer lipid membranes (ptBLMs) containing cytochrome c oxidase (CcO) for the oxygen reduction reaction are studied by using protein film electrochemistry and surface-enhanced infrared absorption (SEIRA) spectroscopy. Mammalian CcO was immobilized on a gold electrode via self-assembled monolayers (SAMs) of mixed alkanethiols. The protein orientation on the electrode is controlled by SAM-CcO interactions and is critical to the cytochrome c (cyt c) binding. The CcO-phospholipid and CcO-cyt c interactions modulate the electrocatalytic activity of CcO, and more densely packed ptBLMs show higher electrocatalytic activity. Our study indicates that spectroscopic and electrochemical studies of ptBLMs can provide insights into the effects of relatively weak protein-protein and protein-lipid interactions on the enzymatic activity of transmembrane enzymes.
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Affiliation(s)
- Masaru Kato
- Faculty of Environmental Earth Science, Hokkaido University, N10W5, Kita-ku, Sapporo 060-0810, Japan
- Graduate School of Environmental Science, Hokkaido University, N10W5, Kita-ku, Sapporo 060-0810, Japan
| | - Ryoya Sano
- Graduate School of Environmental Science, Hokkaido University, N10W5, Kita-ku, Sapporo 060-0810, Japan
| | - Narumi Yoshida
- Graduate School of Environmental Science, Hokkaido University, N10W5, Kita-ku, Sapporo 060-0810, Japan
| | - Masatoshi Iwafuji
- Graduate School of Environmental Science, Hokkaido University, N10W5, Kita-ku, Sapporo 060-0810, Japan
| | - Yoshito Nishiyama
- Graduate School of Environmental Science, Hokkaido University, N10W5, Kita-ku, Sapporo 060-0810, Japan
| | - Sayuki Oka
- Graduate School of Environmental Science, Hokkaido University, N10W5, Kita-ku, Sapporo 060-0810, Japan
| | | | - Yuya Nishida
- Department of Molecular Pharmacology, National Cerebral and Cardiovascular Center, Suita, Osaka 564-8565, Japan
| | - Yasunori Shintani
- Department of Molecular Pharmacology, National Cerebral and Cardiovascular Center, Suita, Osaka 564-8565, Japan
| | - Ichizo Yagi
- Faculty of Environmental Earth Science, Hokkaido University, N10W5, Kita-ku, Sapporo 060-0810, Japan
- Graduate School of Environmental Science, Hokkaido University, N10W5, Kita-ku, Sapporo 060-0810, Japan
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6
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Di Meo V, Moccia M, Sanità G, Crescitelli A, Lamberti A, Galdi V, Rendina I, Esposito E. Probing Denaturation of Protein A via Surface-Enhanced Infrared Absorption Spectroscopy. BIOSENSORS 2022; 12:bios12070530. [PMID: 35884333 PMCID: PMC9313297 DOI: 10.3390/bios12070530] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/15/2022] [Revised: 07/12/2022] [Accepted: 07/14/2022] [Indexed: 12/22/2022]
Abstract
We apply surface-enhanced infrared absorption (SEIRA) spectroscopy to monitor the denaturation process of a surface-bound protein A monolayer. Our proposed platform relies on a plasmonic metasurface comprising different spatial subregions (“pixels”) that are engineered to exhibit different resonances covering the infrared region of the electromagnetic spectrum that is matched to the vibrational modes of the Amide groups. Specifically, we are able to determine changes in the Amide I and Amide II vibration coupled modes, by comparing the SEIRA reflectance spectra pertaining to the native state and a denatured state induced by a pH variation. In particular, we observe some evident red-shifts in the principal Amide I mode and the Amide II vibration coupled modes (attributable to the breaking of hydrogen bonds), which result in insurmountable barriers for refolding. Thanks to the strong field localization, and consequent enhancement of the light-matter interactions, our proposed sensing platform can operate with extremely small amounts of an analyte, with an estimated detection limit of about 3 femtomoles of molecules.
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Affiliation(s)
- Valentina Di Meo
- Institute of Applied Sciences and Intelligent Systems—Unit of Naples, National Research Council, 80131 Naples, Italy; (V.D.M.); (G.S.); (A.C.); (I.R.)
| | - Massimo Moccia
- Fields & Waves Lab, Department of Engineering, University of Sannio, 82100 Benevento, Italy; (M.M.); (V.G.)
| | - Gennaro Sanità
- Institute of Applied Sciences and Intelligent Systems—Unit of Naples, National Research Council, 80131 Naples, Italy; (V.D.M.); (G.S.); (A.C.); (I.R.)
| | - Alessio Crescitelli
- Institute of Applied Sciences and Intelligent Systems—Unit of Naples, National Research Council, 80131 Naples, Italy; (V.D.M.); (G.S.); (A.C.); (I.R.)
| | - Annalisa Lamberti
- Department of Molecular Medicine and Medical Biotechnology, University of Naples Federico II, 80131 Naples, Italy;
| | - Vincenzo Galdi
- Fields & Waves Lab, Department of Engineering, University of Sannio, 82100 Benevento, Italy; (M.M.); (V.G.)
| | - Ivo Rendina
- Institute of Applied Sciences and Intelligent Systems—Unit of Naples, National Research Council, 80131 Naples, Italy; (V.D.M.); (G.S.); (A.C.); (I.R.)
| | - Emanuela Esposito
- Institute of Applied Sciences and Intelligent Systems—Unit of Naples, National Research Council, 80131 Naples, Italy; (V.D.M.); (G.S.); (A.C.); (I.R.)
- Correspondence:
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7
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Ataka K, Baumann A, Chen JL, Redlich A, Heberle J, Schlesinger R. Monitoring the Progression of Cell-Free Expression of Microbial Rhodopsins by Surface Enhanced IR Spectroscopy: Resolving a Branch Point for Successful/Unsuccessful Folding. Front Mol Biosci 2022; 9:929285. [PMID: 35911953 PMCID: PMC9329800 DOI: 10.3389/fmolb.2022.929285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2022] [Accepted: 06/23/2022] [Indexed: 11/13/2022] Open
Abstract
The translocon-unassisted folding process of transmembrane domains of the microbial rhodopsins sensory rhodopsin I (HsSRI) and II (HsSRII), channelrhodopsin II (CrChR2), and bacteriorhodopsin (HsBR) during cell-free expression has been investigated by Surface-Enhanced Infrared Absorption Spectroscopy (SEIRAS). Up to now, only a limited number of rhodopsins have been expressed and folded into the functional holoprotein in cell free expression systems, while other microbial rhodopsins fail to properly bind the chromophore all-trans retinal as indicated by the missing visible absorption. SEIRAS experiments suggest that all investigated rhodopsins lead to the production of polypeptides, which are co-translationally inserted into a solid-supported lipid bilayer during the first hour after the in-vitro expression is initiated. Secondary structure analysis of the IR spectra revealed that the polypeptides form a comparable amount of α-helical structure during the initial phase of insertion into the lipid bilayer. As the process progressed (>1 h), only HsBR exhibited a further increase and association of α-helices to form a compact tertiary structure, while the helical contents of the other rhodopsins stagnated. This result suggests that the molecular reason for the unsuccessful cell-free expression of the two sensory rhodopsins and of CrChR2 is not due to the translation process, but rather to the folding process during the post-translational period. Taking our previous observation into account that HsBR fails to form a tertiary structure in the absence of its retinal, we infer that the chromophore retinal is an integral component of the compaction of the polypeptide into its tertiary structure and the formation of a fully functional protein.
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Affiliation(s)
- Kenichi Ataka
- Department of Physics, Experimental Molecular Biophysics, Freie Universität Berlin, Berlin, Germany
- *Correspondence: Kenichi Ataka, ; Ramona Schlesinger,
| | - Axel Baumann
- Department of Physics, Genetic Biophysics, Freie Universität Berlin, Berlin, Germany
| | - Jheng-Liang Chen
- Department of Physics, Genetic Biophysics, Freie Universität Berlin, Berlin, Germany
| | - Aoife Redlich
- Department of Physics, Experimental Molecular Biophysics, Freie Universität Berlin, Berlin, Germany
| | - Joachim Heberle
- Department of Physics, Experimental Molecular Biophysics, Freie Universität Berlin, Berlin, Germany
| | - Ramona Schlesinger
- Department of Physics, Genetic Biophysics, Freie Universität Berlin, Berlin, Germany
- *Correspondence: Kenichi Ataka, ; Ramona Schlesinger,
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8
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Ataka K, Drauschke J, Stulberg V, Koksch B, Heberle J. pH-induced insertion of pHLIP into a lipid bilayer: In-situ SEIRAS characterization of a folding intermediate at neutral pH. BIOCHIMICA ET BIOPHYSICA ACTA. BIOMEMBRANES 2022; 1864:183873. [PMID: 35104491 DOI: 10.1016/j.bbamem.2022.183873] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2021] [Revised: 11/22/2021] [Accepted: 01/20/2022] [Indexed: 06/14/2023]
Abstract
The pH low insertion peptide (pHLIP) is a pH-sensitive cell penetrating peptide that transforms from an unstructured coil on the membrane surface at pH > 7, to a transmembrane (TM) α-helix at pH < 5. By exploiting this unique property, pHLIP attracts interest as a potential tool for drug delivery and visualisation of acidic tissues produced by various maladies such as cancer, inflammation, hypoxia etc. Even though the structures of initial and end states of pHLIP insertion have been widely accepted, the intermediate structures in between these two states are less clear. Here, we have applied in situ Surface-Enhanced Infrared Absorption spectroscopy to examine the pH-induced insertion and folding processes of pHLIP into a solid-supported lipid bilayer. We show that formation of partially helical structure already takes place at pH only slightly below 7.0, but with the helical axis parallel to the membrane surface. The peptide starts to reorientate its helix from horizontal to vertical direction, accompanied by the insertion into the TM region at pH < 6.2. Further insertion into the TM region of the peptide results in an increase of inherent α-helical structure and complete secondary structure formation at pH 5.3. Analysis of the changes of the carboxylate vibrational bands upon pH titration shows two distinctive groups of aspartates and glutamates with pKa values of 4.5 and 6.3, respectively. Comparison to the amide bands of the peptide backbone suggests that the latter Asp/Glu groups are directly involved in the conformational changes of pHLIP in the respective intermediate states.
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Affiliation(s)
- Kenichi Ataka
- Experimental Molecular Biophysics, Department of Physics, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany.
| | - Janina Drauschke
- Experimental Molecular Biophysics, Department of Physics, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
| | - Valentina Stulberg
- Institute for Chemistry and Biochemistry, Department of Biology, Chemistry, Pharmacy, Freie Universität Berlin, Arnimallee 20, 14195, Berlin, Germany
| | - Beate Koksch
- Institute for Chemistry and Biochemistry, Department of Biology, Chemistry, Pharmacy, Freie Universität Berlin, Arnimallee 20, 14195, Berlin, Germany
| | - Joachim Heberle
- Experimental Molecular Biophysics, Department of Physics, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany.
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9
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Macchia E, Torricelli F, Bollella P, Sarcina L, Tricase A, Di Franco C, Österbacka R, Kovács-Vajna ZM, Scamarcio G, Torsi L. Large-Area Interfaces for Single-Molecule Label-free Bioelectronic Detection. Chem Rev 2022; 122:4636-4699. [PMID: 35077645 DOI: 10.1021/acs.chemrev.1c00290] [Citation(s) in RCA: 31] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Bioelectronic transducing surfaces that are nanometric in size have been the main route to detect single molecules. Though enabling the study of rarer events, such methodologies are not suited to assay at concentrations below the nanomolar level. Bioelectronic field-effect-transistors with a wide (μm2-mm2) transducing interface are also assumed to be not suited, because the molecule to be detected is orders of magnitude smaller than the transducing surface. Indeed, it is like seeing changes on the surface of a one-kilometer-wide pond when a droplet of water falls on it. However, it is a fact that a number of large-area transistors have been shown to detect at a limit of detection lower than femtomolar; they are also fast and hence innately suitable for point-of-care applications. This review critically discusses key elements, such as sensing materials, FET-structures, and target molecules that can be selectively assayed. The amplification effects enabling extremely sensitive large-area bioelectronic sensing are also addressed.
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Affiliation(s)
- Eleonora Macchia
- Faculty of Science and Engineering, Åbo Akademi University, 20500 Turku, Finland
| | - Fabrizio Torricelli
- Dipartimento Ingegneria dell'Informazione, Università degli Studi di Brescia, 25123 Brescia, Italy
| | - Paolo Bollella
- Dipartimento di Chimica, Università degli Studi di Bari "Aldo Moro", 70125 Bari, Italy.,Centre for Colloid and Surface Science - Università degli Studi di Bari "Aldo Moro", 70125 Bari, Italy
| | - Lucia Sarcina
- Dipartimento di Chimica, Università degli Studi di Bari "Aldo Moro", 70125 Bari, Italy
| | - Angelo Tricase
- Dipartimento di Chimica, Università degli Studi di Bari "Aldo Moro", 70125 Bari, Italy
| | - Cinzia Di Franco
- CNR, Istituto di Fotonica e Nanotecnologie, Sede di Bari, 70125 Bari, Italy
| | - Ronald Österbacka
- Faculty of Science and Engineering, Åbo Akademi University, 20500 Turku, Finland
| | - Zsolt M Kovács-Vajna
- Dipartimento Ingegneria dell'Informazione, Università degli Studi di Brescia, 25123 Brescia, Italy
| | - Gaetano Scamarcio
- CNR, Istituto di Fotonica e Nanotecnologie, Sede di Bari, 70125 Bari, Italy.,Dipartimento Interateneo di Fisica "M. Merlin", Università degli Studi di Bari "Aldo Moro", 70125 Bari, Italy
| | - Luisa Torsi
- Faculty of Science and Engineering, Åbo Akademi University, 20500 Turku, Finland.,Dipartimento di Chimica, Università degli Studi di Bari "Aldo Moro", 70125 Bari, Italy.,Centre for Colloid and Surface Science - Università degli Studi di Bari "Aldo Moro", 70125 Bari, Italy
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10
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Yaguchi M, Jia X, Schlesinger R, Jiang X, Ataka K, Heberle J. Near-Infrared Activation of Sensory Rhodopsin II Mediated by NIR-to-Blue Upconversion Nanoparticles. Front Mol Biosci 2022; 8:782688. [PMID: 35252344 PMCID: PMC8892918 DOI: 10.3389/fmolb.2021.782688] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Accepted: 12/28/2021] [Indexed: 12/02/2022] Open
Abstract
Direct optical activation of microbial rhodopsins in deep biological tissue suffers from ineffective light delivery because visible light is strongly scattered and absorbed. NIR light has deeper tissue penetration, but NIR-activation requires a transducer that converts NIR light into visible light in proximity to proteins of interest. Lanthanide-doped upconversion nanoparticles (UCNPs) are ideal transducer as they absorb near-infrared (NIR) light and emit visible light. Therefore, UCNP-assisted excitation of microbial rhodopsins with NIR light has been intensively studied by electrophysiology technique. While electrophysiology is a powerful method to test the functional performance of microbial rhodopsins, conformational changes associated with the NIR light illumination in the presence of UCNPs remain poorly understood. Since UCNPs have generally multiple emission peaks at different wavelengths, it is important to reveal if UCNP-generated visible light induces similar structural changes of microbial rhodopsins as conventional visible light illumination does. Here, we synthesize the lanthanide-doped UCNPs that convert NIR light to blue light. Using these NIR-to-blue UCNPs, we monitor the NIR-triggered conformational changes in sensory rhodopsin II from Natronomonas pharaonis (NpSRII), blue light-sensitive microbial rhodospsin, by FTIR spectroscopy. FTIR difference spectrum of NpSRII was recorded under two different excitation conditions: (ⅰ) with conventional blue light, (ⅱ) with UCNP-generated blue light upon NIR excitation. Both spectra display similar spectral features characteristic of the long-lived M photointermediate state during the photocycle of NpSRII. This study demonstrates that NIR-activation of NpSRII mediated by UCNPs takes place in a similar way to direct blue light activation of NpSRII.
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Affiliation(s)
- Momo Yaguchi
- Experimental Molecular Biophysics, Department of Physics, Freie Universität Berlin, Berlin, Germany
| | - Xiaodan Jia
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Science, Changchun, China
| | - Ramona Schlesinger
- Genetic Biophysics, Department of Physics, Freie Universität Berlin, Berlin, Germany
| | - Xiue Jiang
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Science, Changchun, China
- *Correspondence: Xiue Jiang, ; Joachim Heberle,
| | - Kenichi Ataka
- Experimental Molecular Biophysics, Department of Physics, Freie Universität Berlin, Berlin, Germany
| | - Joachim Heberle
- Experimental Molecular Biophysics, Department of Physics, Freie Universität Berlin, Berlin, Germany
- *Correspondence: Xiue Jiang, ; Joachim Heberle,
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11
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Li S, Wu L, Zhu M, Cheng X, Jiang X. Effect of dipole potential on the orientation of Voltage-gated Alamethicin peptides regulated by chaotropic anions. J Electroanal Chem (Lausanne) 2022. [DOI: 10.1016/j.jelechem.2021.115880] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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12
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Katayama K, Suzuki K, Suno R, Kise R, Tsujimoto H, Iwata S, Inoue A, Kobayashi T, Kandori H. Vibrational spectroscopy analysis of ligand efficacy in human M 2 muscarinic acetylcholine receptor (M 2R). Commun Biol 2021; 4:1321. [PMID: 34815515 PMCID: PMC8635417 DOI: 10.1038/s42003-021-02836-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2021] [Accepted: 11/01/2021] [Indexed: 12/30/2022] Open
Abstract
The intrinsic efficacy of ligand binding to G protein-coupled receptors (GPCRs) reflects the ability of the ligand to differentially activate its receptor to cause a physiological effect. Here we use attenuated total reflection-Fourier transform infrared (ATR-FTIR) spectroscopy to examine the ligand-dependent conformational changes in the human M2 muscarinic acetylcholine receptor (M2R). We show that different ligands affect conformational alteration appearing at the C=O stretch of amide-I band in M2R. Notably, ATR-FTIR signals strongly correlated with G-protein activation levels in cells. Together, we propose that amide-I band serves as an infrared probe to distinguish the ligand efficacy in M2R and paves the path to rationally design ligands with varied efficacy towards the target GPCR.
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Affiliation(s)
- Kota Katayama
- Department of Life Science and Applied Chemistry, Nagoya Institute of Technology, Showa-ku, Nagoya, 466-8555, Japan.
- OptoBioTechnology Research Center, Nagoya Institute of Technology, Showa-ku, Nagoya, 466-8555, Japan.
- PRESTO, Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi, Saitama, 332-0012, Japan.
| | - Kohei Suzuki
- Department of Life Science and Applied Chemistry, Nagoya Institute of Technology, Showa-ku, Nagoya, 466-8555, Japan
| | - Ryoji Suno
- Department of Medical Chemistry, Kansai Medical University, Hirakata, 573-1010, Japan
| | - Ryoji Kise
- Graduate School of Pharmaceutical Sciences, Tohoku University, Sendai, Miyagi, 980-8578, Japan
| | - Hirokazu Tsujimoto
- Department of Cell Biology and Medical Chemistry, Graduate School of Medicine, Kyoto University, Kyoto, 606-8501, Japan
| | - So Iwata
- Department of Cell Biology and Medical Chemistry, Graduate School of Medicine, Kyoto University, Kyoto, 606-8501, Japan
| | - Asuka Inoue
- Graduate School of Pharmaceutical Sciences, Tohoku University, Sendai, Miyagi, 980-8578, Japan
| | - Takuya Kobayashi
- Department of Medical Chemistry, Kansai Medical University, Hirakata, 573-1010, Japan
- Japan Agency for Medical Research and Development, Core Research for Evolutional Science and Technology (AMED-CREST), Chiyoda-ku, Tokyo, 100-0004, Japan
| | - Hideki Kandori
- Department of Life Science and Applied Chemistry, Nagoya Institute of Technology, Showa-ku, Nagoya, 466-8555, Japan.
- OptoBioTechnology Research Center, Nagoya Institute of Technology, Showa-ku, Nagoya, 466-8555, Japan.
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13
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Huang SH, Li J, Fan Z, Delgado R, Shvets G. Monitoring the effects of chemical stimuli on live cells with metasurface-enhanced infrared reflection spectroscopy. LAB ON A CHIP 2021; 21:3991-4004. [PMID: 34474459 PMCID: PMC8511245 DOI: 10.1039/d1lc00580d] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Infrared spectroscopy has found wide applications in the analysis of biological materials. A more recent development is the use of engineered nanostructures - plasmonic metasurfaces - as substrates for metasurface-enhanced infrared reflection spectroscopy (MEIRS). Here, we demonstrate that strong field enhancement from plasmonic metasurfaces enables the use of MEIRS as a highly informative analytic technique for real-time monitoring of cells. By exposing live cells cultured on a plasmonic metasurface to chemical compounds, we show that MEIRS can be used as a label-free phenotypic assay for detecting multiple cellular responses to external stimuli: changes in cell morphology, adhesion, and lipid composition of the cellular membrane, as well as intracellular signaling. Using a focal plane array detection system, we show that MEIRS also enables spectro-chemical imaging at the single-cell level. The described metasurface-based all-optical sensor opens the way to a scalable, high-throughput spectroscopic assay for live cells.
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Affiliation(s)
- Steven H Huang
- School of Applied and Engineering Physics, Cornell University, Ithaca, New York, 14853 USA.
| | - Jiaruo Li
- School of Applied and Engineering Physics, Cornell University, Ithaca, New York, 14853 USA.
| | - Zhiyuan Fan
- School of Applied and Engineering Physics, Cornell University, Ithaca, New York, 14853 USA.
| | - Robert Delgado
- School of Applied and Engineering Physics, Cornell University, Ithaca, New York, 14853 USA.
| | - Gennady Shvets
- School of Applied and Engineering Physics, Cornell University, Ithaca, New York, 14853 USA.
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14
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Liu Y, Xia XH. Thermally Driven Transformation of Water Clustering Structures at Self-Assembled Monolayers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:11493-11498. [PMID: 34549963 DOI: 10.1021/acs.langmuir.1c01724] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Water clustering structures are considered to play key roles in various temperature-dependent life activities. However, our fundamental understanding of the temperature-dependent water structures remains murky because of the limits of the real-time and real-condition monitoring techniques at the molecular level. We propose an in situ ATR-IR approach combining Gaussian fitting to qualitatively and quantitatively explore the temperature-dependent structural stability and transformation of the three water components, multimer water (MW), intermediate water (IW), and network water (NW), on interfaces with different wettabilities. Our results show that the transformation between NW and IW/MW will occur with a change in temperature. This conversion process shows reversibility on hydrophilic Au NPs film/ZnSe, while it is irreversible on a hydrophobic mercaptohexane self-assembled monolayer due to the irreversibility of the monolayer structure and the hydrophobic confinement effect. The established approach enables us to explore the change in the water properties at any interfaces upon external stimuli.
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Affiliation(s)
- Yang Liu
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, Jiangsu 210023, China
- School of Environment, Nanjing Normal University, Nanjing, Jiangsu 210023, China
| | - Xing-Hua Xia
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, Jiangsu 210023, China
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15
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Why Do Tethered-Bilayer Lipid Membranes Suit for Functional Membrane Protein Reincorporation? APPLIED SCIENCES-BASEL 2021. [DOI: 10.3390/app11114876] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Membrane proteins (MPs) are essential for cellular functions. Understanding the functions of MPs is crucial as they constitute an important class of drug targets. However, MPs are a challenging class of biomolecules to analyze because they cannot be studied outside their native environment. Their structure, function and activity are highly dependent on the local lipid environment, and these properties are compromised when the protein does not reside in the cell membrane. Mammalian cell membranes are complex and composed of different lipid species. Model membranes have been developed to provide an adequate environment to envisage MP reconstitution. Among them, tethered-Bilayer Lipid Membranes (tBLMs) appear as the best model because they allow the lipid bilayer to be decoupled from the support. Thus, they provide a sufficient aqueous space to envisage the proper accommodation of large extra-membranous domains of MPs, extending outside. Additionally, as the bilayer remains attached to tethers covalently fixed to the solid support, they can be investigated by a wide variety of surface-sensitive analytical techniques. This review provides an overview of the different approaches developed over the last two decades to achieve sophisticated tBLMs, with a more and more complex lipid composition and adapted for functional MP reconstitution.
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16
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Proniewicz E, Ta Ta A, Iłowska E, Prahl A. Is the Use of Surface-Enhanced Infrared Spectroscopy Justified in the Selection of Peptide Fragments That Play a Role in Substrate-Receptor Interactions? Adsorption of Amino Acids and Neurotransmitters on Colloidal Ag and Au Nanoparticles. J Phys Chem B 2021; 125:2328-2338. [PMID: 33645996 PMCID: PMC8041316 DOI: 10.1021/acs.jpcb.1c00546] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
![]()
This paper describes
an application of attenuated total reflection
Fourier transform infrared spectroscopy (ATR-FTIR) and surface-enhanced
infrared spectroscopy (SEIRA) to characterize the selective adsorption
of four peptides present in body fluids such as neuromedin B (NMB),
bombesin (BN), neurotensin (NT), and bradykinin (BK), which are known
as markers for various human carcinomas. To perform a reliable analysis
of the SERIA spectra of these peptides, curve fitting of these spectra
in the spectral region above 1500 cm–1 and SEIRA
measurements of sulfur-containing and aromatic amino acids were performed.
On the basis of the analyses of the spectral profiles, specific conclusions
were drawn regarding specific molecule–metal interactions and
changes in the interaction during the substrate change from the surface
of silver nanoparticles (AgNPs) to gold nanoparticles (AuNPs).
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Affiliation(s)
- E Proniewicz
- Faculty of Foundry Engineering, AGH University of Science and Technology, 30-059 Krakow, Poland
| | - A Ta Ta
- Faculty of Foundry Engineering, AGH University of Science and Technology, 30-059 Krakow, Poland
| | - E Iłowska
- Faculty of Chemistry, University of Gdansk, Wita Stwosza 63, 80-308 Gdansk, Poland
| | - A Prahl
- Faculty of Chemistry, University of Gdansk, Wita Stwosza 63, 80-308 Gdansk, Poland
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17
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Kato M, Masuda Y, Yoshida N, Tosha T, Shiro Y, Yagi I. Impact of membrane protein-lipid interactions on formation of bilayer lipid membranes on SAM-modified gold electrode. Electrochim Acta 2021. [DOI: 10.1016/j.electacta.2021.137888] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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18
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Birdsall ER, Petti MK, Saraswat V, Ostrander JS, Arnold MS, Zanni MT. Structure Changes of a Membrane Polypeptide under an Applied Voltage Observed with Surface-Enhanced 2D IR Spectroscopy. J Phys Chem Lett 2021; 12:1786-1792. [PMID: 33576633 PMCID: PMC8162810 DOI: 10.1021/acs.jpclett.0c03706] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
The structures of many membrane-bound proteins and polypeptides depend on the membrane potential. However, spectroscopically studying their structures under an applied field is challenging, because a potential is difficult to generate across more than a few bilayers. We study the voltage-dependent structures of the membrane-bound polypeptide, alamethicin, using a spectroelectrochemical cell coated with a rough, gold film to create surface plasmons. The plasmons sufficiently enhance the 2D IR signal to measure a single bilayer. The film is also thick enough to conduct current and thereby apply a potential. The 2D IR spectra resolve features from both 310- and α-helical structures and cross-peaks connecting the two. We observe changes in the peak intensity, not their frequencies, upon applying a voltage. A similar change occurs with pH, which is known to alter the angle of alamethicin relative to the surface normal. The spectra are modeled using a vibrational exciton Hamiltonian, and the voltage-dependent spectra are consistent with a change in angle of the 310- and α-helices in the membrane from 55 to 44°and from 31 to 60°, respectively. The 310- and α-helices are coupled by approximately 10 cm-1. These experiments provide new structural information about alamethicin under a potential difference and demonstrate a technique that might be applied to voltage-gated membrane proteins and compared to molecular dynamics structures.
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Affiliation(s)
- Erin R Birdsall
- Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - Megan K Petti
- Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - Vivek Saraswat
- Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - Joshua S Ostrander
- Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
- Department of Chemistry, Indiana Wesleyan University, Marion, Indiana 46953, United States
| | - Michael S Arnold
- Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - Martin T Zanni
- Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
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19
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Flesch J, Bettenhausen M, Kazmierczak M, Klesse WM, Skibitzki O, Psathaki OE, Kurre R, Capellini G, Guha S, Schroeder T, Witzigmann B, You C, Piehler J. Three-Dimensional Interfacing of Cells with Hierarchical Silicon Nano/Microstructures for Midinfrared Interrogation of In Situ Captured Proteins. ACS APPLIED MATERIALS & INTERFACES 2021; 13:8049-8059. [PMID: 33570931 DOI: 10.1021/acsami.0c22421] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Label-free optical detection of biomolecules is currently limited by a lack of specificity rather than sensitivity. To exploit the much more characteristic refractive index dispersion in the mid-infrared (IR) regime, we have engineered three-dimensional IR-resonant silicon micropillar arrays (Si-MPAs) for protein sensing. By exploiting the unique hierarchical nano- and microstructured design of these Si-MPAs attained by CMOS-compatible silicon-based microfabrication processes, we achieved an optimized interrogation of surface protein binding. Based on spatially resolved surface functionalization, we demonstrate controlled three-dimensional interfacing of mammalian cells with Si-MPAs. Spatially controlled surface functionalization for site-specific protein immobilization enabled efficient targeting of soluble and membrane proteins into sensing hotspots directly from cells cultured on Si-MPAs. Protein binding to Si-MPA hotspots at submonolayer level was unambiguously detected by conventional Fourier transform IR spectroscopy. The compatibility with cost-effective CMOS-based microfabrication techniques readily allows integration of this novel IR transducer into fully fledged bioanalytical microdevices for selective and sensitive protein sensing.
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Affiliation(s)
- Julia Flesch
- Department of Biology, University of Osnabrück, Osnabrück 49076, Germany
| | - Maximilian Bettenhausen
- Department of Electrical Engineering/Computer Science and CINSaT, University of Kassel, Kassel 34121, Germany
| | - Marcin Kazmierczak
- IHP-Leibniz-Institut für Innovative Mikroelektronik, Frankfurt (Oder) 15236, Germany
| | - Wolfgang M Klesse
- IHP-Leibniz-Institut für Innovative Mikroelektronik, Frankfurt (Oder) 15236, Germany
| | - Oliver Skibitzki
- IHP-Leibniz-Institut für Innovative Mikroelektronik, Frankfurt (Oder) 15236, Germany
| | - Olympia E Psathaki
- Department of Biology, University of Osnabrück, Osnabrück 49076, Germany
- Center of Cellular Nanoanalytics, University of Osnabrück, Osnabrück 49076, Germany
| | - Rainer Kurre
- Department of Biology, University of Osnabrück, Osnabrück 49076, Germany
- Center of Cellular Nanoanalytics, University of Osnabrück, Osnabrück 49076, Germany
| | - Giovanni Capellini
- IHP-Leibniz-Institut für Innovative Mikroelektronik, Frankfurt (Oder) 15236, Germany
- Dipartimento di Scienze, Università Roma Tre, Roma 00146, Italy
| | - Subhajit Guha
- IHP-Leibniz-Institut für Innovative Mikroelektronik, Frankfurt (Oder) 15236, Germany
| | - Thomas Schroeder
- Leibniz-Institut für Kristallzüchtung (IKZ), Berlin 12489, Germany
| | - Bernd Witzigmann
- Department of Electrical Engineering/Computer Science and CINSaT, University of Kassel, Kassel 34121, Germany
| | - Changjiang You
- Department of Biology, University of Osnabrück, Osnabrück 49076, Germany
- Center of Cellular Nanoanalytics, University of Osnabrück, Osnabrück 49076, Germany
| | - Jacob Piehler
- Department of Biology, University of Osnabrück, Osnabrück 49076, Germany
- Center of Cellular Nanoanalytics, University of Osnabrück, Osnabrück 49076, Germany
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20
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Souza JCP, Macedo LJA, Hassan A, Sedenho GC, Modenez IA, Crespilho FN. In Situ
and
Operando
Techniques for Investigating Electron Transfer in Biological Systems. ChemElectroChem 2020. [DOI: 10.1002/celc.202001327] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- João C. P. Souza
- São Carlos Institute of Chemistry University of São Paulo 13560-970 São Carlos São Paulo Brazil
- Campus Rio Verde Goiano Federal Institute of Education, Science and Technology 75901-970 Rio Verde Goiás Brazil
| | - Lucyano J. A. Macedo
- São Carlos Institute of Chemistry University of São Paulo 13560-970 São Carlos São Paulo Brazil
| | - Ayaz Hassan
- São Carlos Institute of Chemistry University of São Paulo 13560-970 São Carlos São Paulo Brazil
| | - Graziela C. Sedenho
- São Carlos Institute of Chemistry University of São Paulo 13560-970 São Carlos São Paulo Brazil
| | - Iago A. Modenez
- São Carlos Institute of Chemistry University of São Paulo 13560-970 São Carlos São Paulo Brazil
| | - Frank N. Crespilho
- São Carlos Institute of Chemistry University of São Paulo 13560-970 São Carlos São Paulo Brazil
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21
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Abstract
Infrared difference spectroscopy probes vibrational changes of proteins upon their perturbation. Compared with other spectroscopic methods, it stands out by its sensitivity to the protonation state, H-bonding, and the conformation of different groups in proteins, including the peptide backbone, amino acid side chains, internal water molecules, or cofactors. In particular, the detection of protonation and H-bonding changes in a time-resolved manner, not easily obtained by other techniques, is one of the most successful applications of IR difference spectroscopy. The present review deals with the use of perturbations designed to specifically change the protein between two (or more) functionally relevant states, a strategy often referred to as reaction-induced IR difference spectroscopy. In the first half of this contribution, I review the technique of reaction-induced IR difference spectroscopy of proteins, with special emphasis given to the preparation of suitable samples and their characterization, strategies for the perturbation of proteins, and methodologies for time-resolved measurements (from nanoseconds to minutes). The second half of this contribution focuses on the spectral interpretation. It starts by reviewing how changes in H-bonding, medium polarity, and vibrational coupling affect vibrational frequencies, intensities, and bandwidths. It is followed by band assignments, a crucial aspect mostly performed with the help of isotopic labeling and site-directed mutagenesis, and complemented by integration and interpretation of the results in the context of the studied protein, an aspect increasingly supported by spectral calculations. Selected examples from the literature, predominately but not exclusively from retinal proteins, are used to illustrate the topics covered in this review.
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22
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Katayama K, Suzuki K, Suno R, Tsujimoto H, Iwata S, Kobayashi T, Kandori H. Ligand Binding-Induced Structural Changes in the M 2 Muscarinic Acetylcholine Receptor Revealed by Vibrational Spectroscopy. J Phys Chem Lett 2019; 10:7270-7276. [PMID: 31692352 DOI: 10.1021/acs.jpclett.9b02942] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
M2 muscarinic acetylcholine receptor (M2R) is a prototypical G protein-coupled receptor (GPCR) that responds to acetylcholine and mediates various cellular responses in the nervous system. Here, we used attenuated total reflection-Fourier transform infrared spectroscopy analyses on M2R reconstituted in a lipid membrane to understand the molecular mechanism behind the ligand binding-induced conformational changes. Upon agonist binding, M2R shows large spectral change of the amide-I band corresponding to backbone C═O stretch, which likely connects with the receptor activation in the lipid environment. These results pave the way to probe effects of different ligand binding on GPCRs using vibrational spectroscopy.
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Affiliation(s)
- Kota Katayama
- Department of Life Science and Applied Chemistry , Nagoya Institute of Technology , Showa-ku, Nagoya 466-8555 , Japan
- OptoBioTechnology Research Center , Nagoya Institute of Technology , Showa-ku, Nagoya 466-8555 , Japan
| | - Kohei Suzuki
- Department of Life Science and Applied Chemistry , Nagoya Institute of Technology , Showa-ku, Nagoya 466-8555 , Japan
| | - Ryoji Suno
- Department of Medical Chemistry , Kansai Medical University , Hirakata 573-1010 , Japan
| | - Hirokazu Tsujimoto
- Department of Cell Biology and Medical Chemistry, Graduate School of Medicine , Kyoto University , Kyoto 606-8501 , Japan
| | - So Iwata
- Department of Cell Biology and Medical Chemistry, Graduate School of Medicine , Kyoto University , Kyoto 606-8501 , Japan
| | - Takuya Kobayashi
- Department of Medical Chemistry , Kansai Medical University , Hirakata 573-1010 , Japan
- Japan Agency for Medical Research and Development , Core Research for Evolutional Science and Technology (AMED-CREST) , Tokyo 100-0004 , Japan
| | - Hideki Kandori
- Department of Life Science and Applied Chemistry , Nagoya Institute of Technology , Showa-ku, Nagoya 466-8555 , Japan
- OptoBioTechnology Research Center , Nagoya Institute of Technology , Showa-ku, Nagoya 466-8555 , Japan
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23
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Lee HJ, Jiang Y, Cheng JX. Label-free Optical Imaging of Membrane Potential. CURRENT OPINION IN BIOMEDICAL ENGINEERING 2019; 12:118-125. [PMID: 32864527 DOI: 10.1016/j.cobme.2019.11.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Offering high temporal resolution, voltage imaging is an important and essential technique in neuroscience. Among different optical imaging approaches, the label-free approach remains attractive due to its unique value coming from free of exogenous chromophores. The intrinsic voltage-indicating signals arising from membrane deformation, membrane spectral change, phase shift, light scattering, and membrane hydration haven been reported. First demonstrated 70 years ago, label-free optical imaging of membrane potential is still at an early stage and the field is challenged by the relatively small signals generated by the intrinsic optical properties. We review major contrast mechanisms used for label-free voltage imaging and discuss several recent exciting advances that could potentially enable membrane potential imaging in mammalian neurons at high speed and high sensitivity.
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Affiliation(s)
- Hyeon Jeong Lee
- College of Biomedical Engineering and Instrument Science, Zhejiang University, Hangzhou, Zhejiang 310027.,Department of Electrical and Computer Engineering, Boston University, Boston, MA 02215.,Photonics Center, Boston University, Boston, MA 02215.,These authors contributed equally
| | - Ying Jiang
- Photonics Center, Boston University, Boston, MA 02215.,Graduate Program for Neuroscience, Boston University, Boston, MA 02215.,These authors contributed equally
| | - Ji-Xin Cheng
- Department of Electrical and Computer Engineering, Boston University, Boston, MA 02215.,Department of Biomedical Engineering, Boston University, Boston, MA 02215.,Photonics Center, Boston University, Boston, MA 02215
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24
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Cao F, Wu L, Zhang X, Li S, Wang C, Zhen W, Jiang X. Dynamic surface properties of PEG-coated CuS nanoparticles alter their interaction with cells as revealed by surface-enhanced infrared spectroscopy. NANOSCALE ADVANCES 2019; 1:4268-4276. [PMID: 36134396 PMCID: PMC9417538 DOI: 10.1039/c9na00371a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2019] [Accepted: 09/16/2019] [Indexed: 06/12/2023]
Abstract
Characterization of the dynamic changes of the basic surface properties of nanoparticles is of great significance to reveal the interaction mechanism between nanoparticles and cells; however, it is often neglected due to the limitations of existing analytical methods. This knowledge has been renewed by using surface enhanced infrared absorption spectroscopy (SEIRAS) to study the interaction between PEG-CuS nanoparticles and living cells attached to rGO-Au modified Au films. Based on the difference spectra of cell membranes and the associated water, we clearly revealed that Cu2+ ions produced by the degradation of PEG-CuS can coordinate with PEG, thus changing the interaction between nanoparticles and cells including how and how many nanoparticles enter the cells and the sequential photothermal effect, which breaks through the limitations of the present analytical methods.
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Affiliation(s)
- Fengjuan Cao
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Science Changchun 130022 Jilin China
- University of Chinese Academy of Sciences Beijing 100049 China
| | - Lie Wu
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Science Changchun 130022 Jilin China
| | - Xiaofei Zhang
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Science Changchun 130022 Jilin China
- Department of Chemistry, University of Science and Technology of China Anhui 230026 China
| | - Shanshan Li
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Science Changchun 130022 Jilin China
- Department of Chemistry, University of Science and Technology of China Anhui 230026 China
| | - Chao Wang
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Science Changchun 130022 Jilin China
- Department of Chemistry, University of Science and Technology of China Anhui 230026 China
| | - Wenyao Zhen
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Science Changchun 130022 Jilin China
- Department of Chemistry, University of Science and Technology of China Anhui 230026 China
| | - Xiue Jiang
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Science Changchun 130022 Jilin China
- University of Chinese Academy of Sciences Beijing 100049 China
- Department of Chemistry, University of Science and Technology of China Anhui 230026 China
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25
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Giliberti V, Polito R, Ritter E, Broser M, Hegemann P, Puskar L, Schade U, Zanetti-Polzi L, Daidone I, Corni S, Rusconi F, Biagioni P, Baldassarre L, Ortolani M. Tip-Enhanced Infrared Difference-Nanospectroscopy of the Proton Pump Activity of Bacteriorhodopsin in Single Purple Membrane Patches. NANO LETTERS 2019; 19:3104-3114. [PMID: 30950626 PMCID: PMC6745627 DOI: 10.1021/acs.nanolett.9b00512] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2019] [Revised: 04/02/2019] [Indexed: 05/21/2023]
Abstract
Photosensitive proteins embedded in the cell membrane (about 5 nm thickness) act as photoactivated proton pumps, ion gates, enzymes, or more generally, as initiators of stimuli for the cell activity. They are composed of a protein backbone and a covalently bound cofactor (e.g. the retinal chromophore in bacteriorhodopsin (BR), channelrhodopsin, and other opsins). The light-induced conformational changes of both the cofactor and the protein are at the basis of the physiological functions of photosensitive proteins. Despite the dramatic development of microscopy techniques, investigating conformational changes of proteins at the membrane monolayer level is still a big challenge. Techniques based on atomic force microscopy (AFM) can detect electric currents through protein monolayers and even molecular binding forces in single-protein molecules but not the conformational changes. For the latter, Fourier-transform infrared spectroscopy (FTIR) using difference-spectroscopy mode is typically employed, but it is performed on macroscopic liquid suspensions or thick films containing large amounts of purified photosensitive proteins. In this work, we develop AFM-assisted, tip-enhanced infrared difference-nanospectroscopy to investigate light-induced conformational changes of the bacteriorhodopsin mutant D96N in single submicrometric native purple membrane patches. We obtain a significant improvement compared with the signal-to-noise ratio of standard IR nanospectroscopy techniques by exploiting the field enhancement in the plasmonic nanogap that forms between a gold-coated AFM probe tip and an ultraflat gold surface, as further supported by electromagnetic and thermal simulations. IR difference-spectra in the 1450-1800 cm-1 range are recorded from individual patches as thin as 10 nm, with a diameter of less than 500 nm, well beyond the diffraction limit for FTIR microspectroscopy. We find clear spectroscopic evidence of a branching of the photocycle for BR molecules in direct contact with the gold surfaces, with equal amounts of proteins either following the standard proton-pump photocycle or being trapped in an intermediate state not directly contributing to light-induced proton transport. Our results are particularly relevant for BR-based optoelectronic and energy-harvesting devices, where BR molecular monolayers are put in contact with metal surfaces, and, more generally, for AFM-based IR spectroscopy studies of conformational changes of proteins embedded in intrinsically heterogeneous native cell membranes.
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Affiliation(s)
- Valeria Giliberti
- Istituto
Italiano di Tecnologia, Center for Life NanoScience, Viale Regina Elena 291, I-00161 Roma, Italy
- E-mail:
| | - Raffaella Polito
- Department
of Physics, Sapienza University of Rome, Piazzale Aldo Moro 2, I-00185 Roma, Italy
| | - Eglof Ritter
- Humboldt-Universität
zu Berlin, Institut für
Biologie, Invalidenstraße
42, D-10115 Berlin, Germany
| | - Matthias Broser
- Humboldt-Universität
zu Berlin, Institut für
Biologie, Invalidenstraße
42, D-10115 Berlin, Germany
| | - Peter Hegemann
- Humboldt-Universität
zu Berlin, Institut für
Biologie, Invalidenstraße
42, D-10115 Berlin, Germany
| | - Ljiljana Puskar
- Helmholtz-Zentrum
Berlin für Materialien und Energie GmbH, Albert-Einstein-Str. 15, 12489 Berlin, Germany
| | - Ulrich Schade
- Helmholtz-Zentrum
Berlin für Materialien und Energie GmbH, Albert-Einstein-Str. 15, 12489 Berlin, Germany
| | - Laura Zanetti-Polzi
- Department
of Physical and Chemical Sciences, University
of L’Aquila, Via Vetoio, I-67010 L’Aquila, Italy
| | - Isabella Daidone
- Department
of Physical and Chemical Sciences, University
of L’Aquila, Via Vetoio, I-67010 L’Aquila, Italy
| | - Stefano Corni
- Department
of Chemical Sciences, University of Padova, Via Marzolo 1, I-35131 Padova, Italy
- CNR
Institute
of Nanoscience, Via Campi
213/A, I-41125 Modena, Italy
| | - Francesco Rusconi
- Dipartimento
di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, I-20133 Milano, Italy
| | - Paolo Biagioni
- Dipartimento
di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, I-20133 Milano, Italy
| | - Leonetta Baldassarre
- Department
of Physics, Sapienza University of Rome, Piazzale Aldo Moro 2, I-00185 Roma, Italy
| | - Michele Ortolani
- Istituto
Italiano di Tecnologia, Center for Life NanoScience, Viale Regina Elena 291, I-00161 Roma, Italy
- Department
of Physics, Sapienza University of Rome, Piazzale Aldo Moro 2, I-00185 Roma, Italy
- E-mail:
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26
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Fallah MA, Hauser K. Immobilization approaches can affect protein dynamics: a surface-enhanced infrared spectroscopic study on lipid–protein interactions. Biomater Sci 2019; 7:3204-3212. [DOI: 10.1039/c9bm00140a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Near-field detection of SEIRA reveals that surface immobilization alters conformational properties of α-synuclein.
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Affiliation(s)
| | - Karin Hauser
- Department of Chemistry
- University of Konstanz
- 78457 Konstanz
- Germany
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27
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Liu Y, Bao WJ, Zhang QW, Li J, Li J, Xu JJ, Xia XH, Chen HY. Water as a Universal Infrared Probe for Bioanalysis in Aqueous Solution by Attenuated Total Reflection-Surface Enhanced Infrared Absorption Spectroscopy. Anal Chem 2018; 90:12979-12985. [PMID: 30296050 DOI: 10.1021/acs.analchem.8b03659] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Monitoring the properties and reactions of biomolecules at their interface has attracted ever-growing interest. Here, we propose an approach of infrared analysis technique that utilizes water molecule as a universal probe for in situ and label free monitoring of interfacial bioevents in aqueous solution with high sensitivity. The strong infrared (IR) signal of O-H stretching vibrations from the repelled water is used to sensitively reveal the kinetics of interfacial bioevents at molecular level based on the steric displacement of water using an attenuated total reflection-surface enhanced infrared absorption spectroscopy. Using interfacial immuno-recognition and DNA hybridization as demonstrations, water IR probe offers 26 and 34 times higher sensitivity and even 200 and 86 times lower detection limit for immunosensing and DNA sensing, respectively, as compared to the traditional IR molecular fingerprints.
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Affiliation(s)
- Yang Liu
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering , Nanjing University , Nanjing 210023 , People's Republic of China
| | - Wen-Jing Bao
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering , Nanjing University , Nanjing 210023 , People's Republic of China
| | - Qian-Wen Zhang
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering , Nanjing University , Nanjing 210023 , People's Republic of China
| | - Jin Li
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering , Nanjing University , Nanjing 210023 , People's Republic of China
| | - Jian Li
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering , Nanjing University , Nanjing 210023 , People's Republic of China
| | - Jing-Juan Xu
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering , Nanjing University , Nanjing 210023 , People's Republic of China
| | - Xing-Hua Xia
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering , Nanjing University , Nanjing 210023 , People's Republic of China
| | - Hong-Yuan Chen
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering , Nanjing University , Nanjing 210023 , People's Republic of China
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28
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Kato M, Nakagawa S, Tosha T, Shiro Y, Masuda Y, Nakata K, Yagi I. Surface-Enhanced Infrared Absorption Spectroscopy of Bacterial Nitric Oxide Reductase under Electrochemical Control Using a Vibrational Probe of Carbon Monoxide. J Phys Chem Lett 2018; 9:5196-5200. [PMID: 30141632 DOI: 10.1021/acs.jpclett.8b02581] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Nitric oxide reductases (NORs) reduce nitric oxide to nitrous oxide in the denitrification pathway of the global nitrogen cycle. NORs contain four iron cofactors and the NO reduction occurs at the heme b3/nonheme FeB binuclear active site. The determination of reduction potentials of the iron cofactors will help us elucidate the enzymatic reaction mechanism. However, previous reports on these potentials remain controversial. Herein, we performed electrochemical and surface-enhanced infrared absorption (SEIRA) spectroscopic measurements of Pseudomonas aeruginosa NOR immobilized on gold electrodes. Cyclic voltammograms exhibited two reduction peaks at -0.11 and -0.44 V vs SHE, and a SEIRA spectrum using a vibrational probe of CO showed a characteristic band at 1972 cm-1 at -0.4 V vs SHE, which was assigned to νCO of heme b3-CO. Our results suggest that the reduction of heme b3 initiates the enzymatic NO reduction.
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Affiliation(s)
- Masaru Kato
- Global Research Center for Environment and Energy based on Nanomaterials Science (GREEN) , National Institute for Materials Science (NIMS) , Tsukuba 305-0044 , Japan
| | | | - Takehiko Tosha
- RIKEN , SPring-8 Center , Kouto, Sayo , Hyogo 679-5148 , Japan
| | - Yoshitsugu Shiro
- Graduate School of Life Science , University of Hyogo , Hyogo 678-1297 , Japan
| | | | | | - Ichizo Yagi
- Global Research Center for Environment and Energy based on Nanomaterials Science (GREEN) , National Institute for Materials Science (NIMS) , Tsukuba 305-0044 , Japan
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29
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Abstract
Proton transfer plays a crucial role in a variety of biological phenomena. The transformation of nanomaterials in the environment and biology makes probing the potential proton transfer between nanomaterials and biomolecules a crucial issue, but it still remains a significant challenge. Here, we report proton transfer at the interface of graphene oxide (GO) by studying the GO-induced vibrational changes of interfacial water and carboxyl-terminated self-assembled monolayer (SAM) with surface-enhanced infrared absorption spectroscopy. In addition to simply acting as a macromolecular buffer in solution, the GO sheet behaves as a two-dimensional hydrogen-bonded exchangeable proton pool to dissociate and transfer protons at the interface with a suitable Brønsted base pair, which may bear a significant potential toxic origin for biological systems with proton-coupled reactions.
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Affiliation(s)
- Lie Wu
- State Key Lab of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry , Chinese Academy of Sciences , Changchun , 130022 Jilin , China
| | - Xiue Jiang
- State Key Lab of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry , Chinese Academy of Sciences , Changchun , 130022 Jilin , China.,University of Science and Technology of China , Hefei , 230026 Anhui , China
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30
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Su Z, Shodiev M, Leitch JJ, Abbasi F, Lipkowski J. Role of Transmembrane Potential and Defects on the Permeabilization of Lipid Bilayers by Alamethicin, an Ion-Channel-Forming Peptide. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:6249-6260. [PMID: 29722994 DOI: 10.1021/acs.langmuir.8b00928] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The insertion and ion-conducting channel properties of alamethicin reconstituted into a 1,2-di- O-phytanyl- sn-glycero-3-phosphocholine bilayer floating on the surface of a gold (111) electrode modified with a 1-thio-β-d-glucose (β-Tg) self-assembled monolayer were investigated using a combination of electrochemical impedance spectroscopy (EIS) and polarization modulation infrared reflection absorption spectroscopy (PM-IRRAS). The hydrophilic β-Tg monolayer separated the bilayer from the gold substrate and created a water-rich spacer region, which better represents natural cell membranes. The EIS measurements acquired information about the membrane resistivity (a measure of membrane porosity), and the PM-IRRAS experiments provided insight into the conformation and orientation of the membrane constituents as a function of the transmembrane potential. The results showed that the presence of alamethicin had a small effect on the conformation and orientation of phospholipid molecules within the bilayer for all studied potentials. In contrast, the alamethicin peptides assumed a surface state, where the helical axes adopted a large tilt angle with respect to the surface normal, at small transmembrane potentials, and inserted into the bilayer at sufficiently negative transmembrane potentials forming pores, which behaved as barrel-stave ion channels for ionic transport across the membrane. The results indicated that insertion of alamethincin peptides into the bilayer was driven by the dipole-field interactions and that the transitions between the inserted and surface states were electrochemically reversible. Additionally, the EIS measurements performed on phospholipid bilayers without alamethicin also showed that the application of negative transmembrane potentials introduces defects into the bilayer. The membrane resistances measured in both the absence and presence of alamethicin show similar dependencies on the electrode potential, suggesting that the insertion of the peptide may also be assisted by the electroporation of the membrane. The findings in this study provide new insights into the mechanism of alamethicin insertion into phospholipid bilayers.
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Affiliation(s)
- ZhangFei Su
- Department of Chemistry , University of Guelph , Guelph , Ontario N1G 2W1 , Canada
| | - Muzaffar Shodiev
- Department of Chemistry , University of Guelph , Guelph , Ontario N1G 2W1 , Canada
| | - J Jay Leitch
- Department of Chemistry , University of Guelph , Guelph , Ontario N1G 2W1 , Canada
| | - Fatemeh Abbasi
- Department of Chemistry , University of Guelph , Guelph , Ontario N1G 2W1 , Canada
| | - Jacek Lipkowski
- Department of Chemistry , University of Guelph , Guelph , Ontario N1G 2W1 , Canada
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31
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Pfitzner E, Seki H, Schlesinger R, Ataka K, Heberle J. Disc Antenna Enhanced Infrared Spectroscopy: From Self-Assembled Monolayers to Membrane Proteins. ACS Sens 2018; 3:984-991. [PMID: 29741356 DOI: 10.1021/acssensors.8b00139] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Plasmonic surfaces have emerged as a powerful platform for biomolecular sensing applications and can be designed to optimize the plasmonic resonance for probing molecular vibrations at utmost sensitivity. Here, we present a facile procedure to generate metallic microdisc antenna arrays that are employed in surface-enhanced infrared absorption (SEIRA) spectroscopy of biomolecules. Transmission electron microscopy (TEM) grids are used as shadow mask deployed during physical vapor deposition of gold. The resulting disc-shaped antennas exhibit enhancement factors of the vibrational bands of 4 × 104 giving rise to a detection limit <1 femtomol (10-15 mol) of molecules. Surface-bound monolayers of 4-mercaptobenzoic acid show polyelectrolyte behavior when titrated with cations in the aqueous medium. Conformational rigidity of the self-assembled monolayer is validated by density functional theory calculations. The membrane protein sensory rhodopsin II is tethered to the disc antenna arrays and is fully functional as inferred from the light-induced SEIRA difference spectra. As an advance to previous studies, the accessible frequency range is improved and extended into the fingerprint region.
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Affiliation(s)
- Emanuel Pfitzner
- Experimental Molecular Biophysics, Department of Physics, Freie Universität Berlin, Arnimalle 14, 14195 Berlin, Germany
| | - Hirofumi Seki
- Experimental Molecular Biophysics, Department of Physics, Freie Universität Berlin, Arnimalle 14, 14195 Berlin, Germany
- Toray Research Center Inc., 3-3-7 Sonoyama, Otsu, Shiga 520-8567, Japan
| | - Ramona Schlesinger
- Genetic Biophysics, Department of Physics, Freie Universität Berlin, Arnimalle 14, 14195 Berlin, Germany
| | - Kenichi Ataka
- Experimental Molecular Biophysics, Department of Physics, Freie Universität Berlin, Arnimalle 14, 14195 Berlin, Germany
| | - Joachim Heberle
- Experimental Molecular Biophysics, Department of Physics, Freie Universität Berlin, Arnimalle 14, 14195 Berlin, Germany
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32
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Gutiérrez-Sanz O, Forbrig E, Batista AP, Pereira MM, Salewski J, Mroginski MA, Götz R, De Lacey AL, Kozuch J, Zebger I. Catalytic Activity and Proton Translocation of Reconstituted Respiratory Complex I Monitored by Surface-Enhanced Infrared Absorption Spectroscopy. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:5703-5711. [PMID: 29553272 DOI: 10.1021/acs.langmuir.7b04057] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Respiratory complex I (CpI) is a key player in the way organisms obtain energy, being an energy transducer, which couples nicotinamide adenine dinucleotide (NADH)/quinone oxidoreduction with proton translocation by a mechanism that remains elusive so far. In this work, we monitored the function of CpI in a biomimetic, supported lipid membrane system assembled on a 4-aminothiophenol (4-ATP) self-assembled monolayer by surface-enhanced infrared absorption spectroscopy. 4-ATP serves not only as a linker molecule to a nanostructured gold surface but also as pH sensor, as indicated by concomitant density functional theory calculations. In this way, we were able to monitor NADH/quinone oxidoreduction-induced transmembrane proton translocation via the protonation state of 4-ATP, depending on the net orientation of CpI molecules induced by two complementary approaches. An associated change of the amide I/amide II band intensity ratio indicates conformational modifications upon catalysis which may involve movements of transmembrane helices or other secondary structural elements, as suggested in the literature [ Di Luca , Proc. Natl. Acad. Sci. U.S.A. , 2017 , 114 , E6314 - E6321 ].
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Affiliation(s)
- Oscar Gutiérrez-Sanz
- Instituto de Catalisis y Petroleoquimica , CSIC c/ Marie Curie 2 , 28049 Madrid , Spain
| | - Enrico Forbrig
- Institut für Chemie, PC 14 , Technische Universität Berlin , Strasse des 17. Juni 135 , D-10623 Berlin , Germany
| | - Ana P Batista
- Instituto de Tecnologia Química e Biológica-António Xavier , Universidade Nova de Lisboa , Av. da Republica EAN , 2780-157 Oeiras , Portugal
| | - Manuela M Pereira
- Instituto de Tecnologia Química e Biológica-António Xavier , Universidade Nova de Lisboa , Av. da Republica EAN , 2780-157 Oeiras , Portugal
| | - Johannes Salewski
- Institut für Chemie, PC 14 , Technische Universität Berlin , Strasse des 17. Juni 135 , D-10623 Berlin , Germany
| | - Maria A Mroginski
- Institut für Chemie, PC 14 , Technische Universität Berlin , Strasse des 17. Juni 135 , D-10623 Berlin , Germany
| | - Robert Götz
- Institut für Chemie, PC 14 , Technische Universität Berlin , Strasse des 17. Juni 135 , D-10623 Berlin , Germany
| | - Antonio L De Lacey
- Instituto de Catalisis y Petroleoquimica , CSIC c/ Marie Curie 2 , 28049 Madrid , Spain
| | - Jacek Kozuch
- Institut für Chemie, PC 14 , Technische Universität Berlin , Strasse des 17. Juni 135 , D-10623 Berlin , Germany
| | - Ingo Zebger
- Institut für Chemie, PC 14 , Technische Universität Berlin , Strasse des 17. Juni 135 , D-10623 Berlin , Germany
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33
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Abstract
Redox enzymes, which catalyze reactions involving electron transfers in living organisms, are very promising components of biotechnological devices, and can be envisioned for sensing applications as well as for energy conversion. In this context, one of the most significant challenges is to achieve efficient direct electron transfer by tunneling between enzymes and conductive surfaces. Based on various examples of bioelectrochemical studies described in the recent literature, this review discusses the issue of enzyme immobilization at planar electrode interfaces. The fundamental importance of controlling enzyme orientation, how to obtain such orientation, and how it can be verified experimentally or by modeling are the three main directions explored. Since redox enzymes are sizable proteins with anisotropic properties, achieving their functional immobilization requires a specific and controlled orientation on the electrode surface. All the factors influenced by this orientation are described, ranging from electronic conductivity to efficiency of substrate supply. The specificities of the enzymatic molecule, surface properties, and dipole moment, which in turn influence the orientation, are introduced. Various ways of ensuring functional immobilization through tuning of both the enzyme and the electrode surface are then described. Finally, the review deals with analytical techniques that have enabled characterization and quantification of successful achievement of the desired orientation. The rich contributions of electrochemistry, spectroscopy (especially infrared spectroscopy), modeling, and microscopy are featured, along with their limitations.
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34
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Cao F, Wu L, Ruan Y, Bai J, Jiang X. In Situ Surface-Enhanced Infrared Absorption Spectroscopy of Aqueous Molecules with Facile-Prepared Large-Area Reduced Graphene Oxide Island Film. Anal Chem 2018; 90:6526-6531. [DOI: 10.1021/acs.analchem.7b05466] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Fengjuan Cao
- State Key Lab of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, Jilin, China
- University of Chinese Academy of Sciences, Beijing 100039, China
| | - Lie Wu
- State Key Lab of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, Jilin, China
| | - Yudi Ruan
- State Key Lab of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, Jilin, China
- University of Chinese Academy of Sciences, Beijing 100039, China
| | - Jing Bai
- State Key Lab of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, Jilin, China
| | - Xiue Jiang
- State Key Lab of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, Jilin, China
- University of Chinese Academy of Sciences, Beijing 100039, China
- Department of Chemistry, University of Science and Technology of China, Anhui 230026, China
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35
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Bao WJ, Li J, Li J, Zhang QW, Liu Y, Shi CF, Xia XH. Au/ZnSe-Based Surface Enhanced Infrared Absorption Spectroscopy as a Universal Platform for Bioanalysis. Anal Chem 2018; 90:3842-3848. [DOI: 10.1021/acs.analchem.7b04505] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Wen-Jing Bao
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, People’s Republic of China
| | - Jian Li
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, People’s Republic of China
| | - Jin Li
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, People’s Republic of China
| | - Qian-Wen Zhang
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, People’s Republic of China
| | - Yang Liu
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, People’s Republic of China
| | - Cai-Feng Shi
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, People’s Republic of China
| | - Xing-Hua Xia
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, People’s Republic of China
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36
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Forbrig E, Staffa JK, Salewski J, Mroginski MA, Hildebrandt P, Kozuch J. Monitoring the Orientational Changes of Alamethicin during Incorporation into Bilayer Lipid Membranes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:2373-2385. [PMID: 29353482 DOI: 10.1021/acs.langmuir.7b04265] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Antimicrobial peptides (AMPs) are the first line of defense after contact of an infectious invader, for example, bacterium or virus, with a host and an integral part of the innate immune system of humans. Their broad spectrum of biological functions ranges from cell membrane disruption over facilitation of chemotaxis to interaction with membrane-bound or intracellular receptors, thus providing novel strategies to overcome bacterial resistances. Especially, the clarification of the mechanisms and dynamics of AMP incorporation into bacterial membranes is of high interest, and different mechanistic models are still under discussion. In this work, we studied the incorporation of the peptaibol alamethicin (ALM) into tethered bilayer lipid membranes on electrodes in combination with surface-enhanced infrared absorption (SEIRA) spectroscopy. This approach allows monitoring the spontaneous and potential-induced ion channel formation of ALM in situ. The complex incorporation kinetics revealed a multistep mechanism that points to peptide-peptide interactions prior to penetrating the membrane and adopting the transmembrane configuration. On the basis of the anisotropy of the backbone amide I and II infrared absorptions determined by density functional theory calculations, we employed a mathematical model to evaluate ALM reorientations monitored by SEIRA spectroscopy. Accordingly, ALM was found to adopt inclination angles of ca. 69°-78° and 21° in its interfacially adsorbed and transmembrane incorporated states, respectively. These orientations can be stabilized efficiently by the dipolar interaction with lipid head groups or by the application of a potential gradient. The presented potential-controlled mechanistic study suggests an N-terminal integration of ALM into membranes as monomers or parallel oligomers to form ion channels composed of parallel-oriented helices, whereas antiparallel oligomers are barred from intrusion.
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Affiliation(s)
- Enrico Forbrig
- Technische Universität Berlin, Institut für Chemie , Sekr. PC14, Strasse des 17. Juni 135, D-10623 Berlin, Germany
| | - Jana K Staffa
- Technische Universität Berlin, Institut für Chemie , Sekr. PC14, Strasse des 17. Juni 135, D-10623 Berlin, Germany
| | - Johannes Salewski
- Technische Universität Berlin, Institut für Chemie , Sekr. PC14, Strasse des 17. Juni 135, D-10623 Berlin, Germany
| | - Maria Andrea Mroginski
- Technische Universität Berlin, Institut für Chemie , Sekr. PC14, Strasse des 17. Juni 135, D-10623 Berlin, Germany
| | - Peter Hildebrandt
- Technische Universität Berlin, Institut für Chemie , Sekr. PC14, Strasse des 17. Juni 135, D-10623 Berlin, Germany
| | - Jacek Kozuch
- Technische Universität Berlin, Institut für Chemie , Sekr. PC14, Strasse des 17. Juni 135, D-10623 Berlin, Germany
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37
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Macedo LJA, Crespilho FN. Multiplex Infrared Spectroscopy Imaging for Monitoring Spatially Resolved Redox Chemistry. Anal Chem 2018; 90:1487-1491. [DOI: 10.1021/acs.analchem.7b04438] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Lucyano J. A. Macedo
- São Carlos Institute
of Chemistry, University of São Paulo, São Paulo 13560-970, Brazil
| | - Frank N. Crespilho
- São Carlos Institute
of Chemistry, University of São Paulo, São Paulo 13560-970, Brazil
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38
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Bao WJ, Li J, Cao TY, Li J, Xia XH. Chain-length dependent interfacial immunoreaction kinetics on self-assembled monolayers revealed by surface-enhanced infrared absorption spectroscopy. Talanta 2018; 176:124-129. [DOI: 10.1016/j.talanta.2017.08.017] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2017] [Revised: 08/02/2017] [Accepted: 08/05/2017] [Indexed: 01/30/2023]
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39
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Ash PA, Hidalgo R, Vincent KA. Protein Film Infrared Electrochemistry Demonstrated for Study of H2 Oxidation by a [NiFe] Hydrogenase. J Vis Exp 2017:55858. [PMID: 29286464 PMCID: PMC5755520 DOI: 10.3791/55858] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Understanding the chemistry of redox proteins demands methods that provide precise control over redox centers within the protein. The technique of protein film electrochemistry, in which a protein is immobilized on an electrode surface such that the electrode replaces physiological electron donors or acceptors, has provided functional insight into the redox reactions of a range of different proteins. Full chemical understanding requires electrochemical control to be combined with other techniques that can add additional structural and mechanistic insight. Here we demonstrate a technique, protein film infrared electrochemistry, which combines protein film electrochemistry with infrared spectroscopic sampling of redox proteins. The technique uses a multiple-reflection attenuated total reflectance geometry to probe a redox protein immobilized on a high surface area carbon black electrode. Incorporation of this electrode into a flow cell allows solution pH or solute concentrations to be changed during measurements. This is particularly powerful in addressing redox enzymes, where rapid catalytic turnover can be sustained and controlled at the electrode allowing spectroscopic observation of long-lived intermediate species in the catalytic mechanism. We demonstrate the technique with experiments on E. coli hydrogenase 1 under turnover (H2 oxidation) and non-turnover conditions.
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Affiliation(s)
- Philip A Ash
- Department of Chemistry, University of Oxford, Inorganic Chemistry Laboratory
| | - Ricardo Hidalgo
- Department of Chemistry, University of Oxford, Inorganic Chemistry Laboratory
| | - Kylie A Vincent
- Department of Chemistry, University of Oxford, Inorganic Chemistry Laboratory;
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40
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Kraack JP. Ultrafast structural molecular dynamics investigated with 2D infrared spectroscopy methods. Top Curr Chem (Cham) 2017; 375:86. [PMID: 29071445 DOI: 10.1007/s41061-017-0172-1] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2017] [Accepted: 10/02/2017] [Indexed: 12/23/2022]
Abstract
Ultrafast, multi-dimensional infrared (IR) spectroscopy has been advanced in recent years to a versatile analytical tool with a broad range of applications to elucidate molecular structure on ultrafast timescales, and it can be used for samples in a many different environments. Following a short and general introduction on the benefits of 2D IR spectroscopy, the first part of this chapter contains a brief discussion on basic descriptions and conceptual considerations of 2D IR spectroscopy. Outstanding classical applications of 2D IR are used afterwards to highlight the strengths and basic applicability of the method. This includes the identification of vibrational coupling in molecules, characterization of spectral diffusion dynamics, chemical exchange of chemical bond formation and breaking, as well as dynamics of intra- and intermolecular energy transfer for molecules in bulk solution and thin films. In the second part, several important, recently developed variants and new applications of 2D IR spectroscopy are introduced. These methods focus on (i) applications to molecules under two- and three-dimensional confinement, (ii) the combination of 2D IR with electrochemistry, (iii) ultrafast 2D IR in conjunction with diffraction-limited microscopy, (iv) several variants of non-equilibrium 2D IR spectroscopy such as transient 2D IR and 3D IR, and (v) extensions of the pump and probe spectral regions for multi-dimensional vibrational spectroscopy towards mixed vibrational-electronic spectroscopies. In light of these examples, the important open scientific and conceptual questions with regard to intra- and intermolecular dynamics are highlighted. Such questions can be tackled with the existing arsenal of experimental variants of 2D IR spectroscopy to promote the understanding of fundamentally new aspects in chemistry, biology and materials science. The final part of the chapter introduces several concepts of currently performed technical developments, which aim at exploiting 2D IR spectroscopy as an analytical tool. Such developments embrace the combination of 2D IR spectroscopy and plasmonic spectroscopy for ultrasensitive analytics, merging 2D IR spectroscopy with ultra-high-resolution microscopy (nanoscopy), future variants of transient 2D IR methods, or 2D IR in conjunction with microfluidics. It is expected that these techniques will allow for groundbreaking research in many new areas of natural sciences.
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Affiliation(s)
- Jan Philip Kraack
- Department of Chemistry, University of Zürich, Winterthurerstrasse 190, 8057, Zurich, Switzerland.
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41
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Zeng L, Wu L, Liu L, Jiang X. The Role of Water Distribution Controlled by Transmembrane Potentials in the Cytochrome c-Cardiolipin Interaction: Revealing from Surface-Enhanced Infrared Absorption Spectroscopy. Chemistry 2017; 23:15491-15497. [PMID: 28845886 DOI: 10.1002/chem.201703400] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2017] [Indexed: 01/22/2023]
Abstract
The interaction of cytochrome c (cyt c) with cardiolipin (CL) plays a crucial role in apoptotic functions, however, the changes of the transmembrane potential in governing the protein behavior at the membrane-water interface have not been studied due to the difficulties in simultaneously monitoring the interaction and regulating the electric field. Herein, surface-enhanced infrared absorption (SEIRA) spectroelectrochemistry is employed to study the mechanism of how the transmembrane potentials control the interaction of cyt c with CL membranes by regulating the electrode potentials of an Au film. When the transmembrane potential decreases, the water content at the interface of the membranes can be increased to slow down protein adsorption through decreasing the hydrogen-bond and hydrophobic interactions, but regulates the redox behavior of CL-bound cyt c through a possible water-facilitated proton-coupled electron transfer process. Our results suggest that the potential drop-induced restructure of the CL conformation and the hydration state could modify the structure and function of CL-bound cyt c on the lipid membrane.
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Affiliation(s)
- Li Zeng
- State Key Lab of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, 130022, P. R. China.,University of Chinese Academy of Sciences, Beijing, 100039, P. R. China
| | - Lie Wu
- State Key Lab of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, 130022, P. R. China
| | - Li Liu
- State Key Lab of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, 130022, P. R. China
| | - Xiue Jiang
- State Key Lab of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, 130022, P. R. China
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42
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Bibikova O, Haas J, López-Lorente ÁI, Popov A, Kinnunen M, Ryabchikov Y, Kabashin A, Meglinski I, Mizaikoff B. Surface enhanced infrared absorption spectroscopy based on gold nanostars and spherical nanoparticles. Anal Chim Acta 2017; 990:141-149. [PMID: 29029737 DOI: 10.1016/j.aca.2017.07.045] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2017] [Revised: 07/24/2017] [Accepted: 07/24/2017] [Indexed: 01/25/2023]
Abstract
Plasmonic anisotropic nanoparticles possess a number of hot spots on their surface due to the presence of sharp edges, tips or vertices, leading to a high electric field strength surrounding the nanostructures. In this paper, we explore different plasmonic nanostructures, including anisotropic gold nanostars (AuNSts) and spherical gold nanoparticles, in surface-enhanced infrared absorption spectroscopy (SEIRAS) in an attenuated total reflection (ATR) configuration. In our experiments, we observed up to 10-times enhancement of the infrared (IR) absorption of thioglycolic acid (TGA) and up to 2-times enhancement of signals for bovine serum albumin (BSA) protein on plasmonic nanostructure-based films deposited on a silicon (Si) internal reflection element (IRE) compared to bare Si IRE. The dependence of the observed enhancement on the amount of AuNSts present at the surface of the IRE has been demonstrated. Quantitative studies with both, TGA and BSA were performed, observing that the SEIRA signal can be correlated to the concentration of analyte molecules present within the evanescent field. The calibration curves in the presence of the AuNSts showed enhanced sensitivity as compared with the bare Si IRE. We finally compare efficiencies of anisotropic AuNSts and spherical citrate-capped and "bare" laser-synthesized gold nanoparticles as SEIRAS substrates for the detection of TGA and BSA. The signal obtained from AuNSts was at least 2 times higher for TGA molecules in comparison with spherical gold nanoparticles, which was explained by a more efficient generation of hot spots on anisotropic surface due to the presence of sharp edges, tips or vertices, leading to a high electric field strength surrounding the AuNSts.
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Affiliation(s)
- Olga Bibikova
- Optoelectronics and Measurement Techniques Research Unit, University of Oulu, 90014 Oulu, Finland; Institute of Analytical and Bioanalytical Chemistry, Ulm University, 89081 Ulm, Germany; Art Photonics GmbH, 12489 Berlin, Germany; Research-Educational Institute of Optics and Biophotonics, Saratov National Research State University, 410012 Saratov, Russia
| | - Julian Haas
- Institute of Analytical and Bioanalytical Chemistry, Ulm University, 89081 Ulm, Germany
| | | | - Alexey Popov
- Optoelectronics and Measurement Techniques Research Unit, University of Oulu, 90014 Oulu, Finland; ITMO University, 197101 St Petersburg, Russia; Interdisciplinary Laboratory of Biophotonics, Tomsk National Research State University, 634050 Tomsk, Russia
| | - Matti Kinnunen
- Optoelectronics and Measurement Techniques Research Unit, University of Oulu, 90014 Oulu, Finland
| | - Yury Ryabchikov
- Aix-Marseille University, CNRS, UMR 7341 CNRS, LP3, Campus de Luminy, Case 917, F-13288 Marseille Cedex 9, France; P.N. Lebedev Physical Institute of Russian Academy of Sciences, 199 991 Moscow, Russia
| | - Andrei Kabashin
- Aix-Marseille University, CNRS, UMR 7341 CNRS, LP3, Campus de Luminy, Case 917, F-13288 Marseille Cedex 9, France; National Research Nuclear University "MEPhI", Institute of Engineering Physics for Biomedicine (PhysBio), Bio-Nanophotonics Lab., 115409 Moscow, Russia
| | - Igor Meglinski
- Optoelectronics and Measurement Techniques Research Unit, University of Oulu, 90014 Oulu, Finland; ITMO University, 197101 St Petersburg, Russia; Interdisciplinary Laboratory of Biophotonics, Tomsk National Research State University, 634050 Tomsk, Russia
| | - Boris Mizaikoff
- Institute of Analytical and Bioanalytical Chemistry, Ulm University, 89081 Ulm, Germany.
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43
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Attenuated Total Reflection Surface-Enhanced Infrared Absorption Spectroscopy: a Powerful Technique for Bioanalysis. JOURNAL OF ANALYSIS AND TESTING 2017. [DOI: 10.1007/s41664-017-0009-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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44
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Geiss AF, Khandelwal R, Baurecht D, Bliem C, Reiner-Rozman C, Boersch M, Ullmann GM, Loew LM, Naumann RLC. pH and Potential Transients of the bc 1 Complex Co-Reconstituted in Proteo-Lipobeads with the Reaction Center from Rb. sphaeroides. J Phys Chem B 2017; 121:143-152. [PMID: 27992230 DOI: 10.1021/acs.jpcb.6b11116] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
His-tag technology is employed to bind membrane proteins, such as the bc1 complex and the reaction center (RC) from Rhodobacter sphaeroides, to spherical as well as planar surfaces in a strict orientation. Subsequently, the spherical and planar surfaces are subjected to in situ dialysis to form proteo-lipobeads (PLBs) and protein-tethered bilayer membranes, respectively. PLBs based on Ni-nitrileotriacetic acid-functionalized agarose beads that have diameters ranging from 50 to 150 μm are used to assess proton release and membrane potential parameters by confocal laser-scanning microscopy. The pH and potential transients are thus obtained from bc1 activated by the RC. To assess the turnover of bc1 excited by the RC in a similar setting, we used the planar surface of an attenuated total reflection crystal modified with a thin gold layer to carry out time-resolved surface-enhanced IR absorption spectroscopy triggered by flash lamp excitation. The experiments suggest that both proteins interact in a cyclic manner in both environments. The activity of the proteins seems to be preserved in the same manner as that in chromatophores or reconstituted in liposomes.
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Affiliation(s)
- Andreas F Geiss
- Biosensor Technologies, Austrian Institute of Technology GmbH, AIT , Donau-City Street 1, 1220 Vienna, Austria.,University of Natural Resources and Life Sciences , Gregor-Mendel-Straße 33, 1180 Wien, Austria
| | - Raghav Khandelwal
- Indian Institute of Technology Kanpur , Kalyanpur, Kanpur, Uttar Pradesh 208016, India
| | - Dieter Baurecht
- Faculty of Chemistry, Department of Physical Chemistry, University of Vienna , Währinger Straße 42, 1090 Vienna, Austria
| | - Christina Bliem
- Biosensor Technologies, Austrian Institute of Technology GmbH, AIT , Donau-City Street 1, 1220 Vienna, Austria.,Center of Electrochemical Surface Technology, CEST , Viktor-Kaplan-Str. 2, 2700 Wiener Neustadt, Austria
| | - Ciril Reiner-Rozman
- Biosensor Technologies, Austrian Institute of Technology GmbH, AIT , Donau-City Street 1, 1220 Vienna, Austria.,Center of Electrochemical Surface Technology, CEST , Viktor-Kaplan-Str. 2, 2700 Wiener Neustadt, Austria
| | - Michael Boersch
- Single-Molecule Microscopy Group, Jena University Hospital , Nonnenplan 2-4, 07743 Jena, Germany
| | - G Matthias Ullmann
- Computational Biochemistry Group, University of Bayreuth , Universitätsstraße 30, NWI, 95447 Bayreuth, Germany
| | - Leslie M Loew
- R. D. Berlin Center for Cell Analysis and Modeling, University of Connecticut Health Center , Farmington, Connecticut 06030, United States
| | - Renate L C Naumann
- Biosensor Technologies, Austrian Institute of Technology GmbH, AIT , Donau-City Street 1, 1220 Vienna, Austria
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45
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Kottke T, Lórenz-Fonfría VA, Heberle J. The Grateful Infrared: Sequential Protein Structural Changes Resolved by Infrared Difference Spectroscopy. J Phys Chem B 2016; 121:335-350. [PMID: 28100053 DOI: 10.1021/acs.jpcb.6b09222] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The catalytic activity of proteins is a function of structural changes. Very often these are as minute as protonation changes, hydrogen bonding changes, and amino acid side chain reorientations. To resolve these, a methodology is afforded that not only provides the molecular sensitivity but allows for tracing the sequence of these hierarchical reactions at the same time. This feature article showcases results from time-resolved IR spectroscopy on channelrhodopsin (ChR), light-oxygen-voltage (LOV) domain protein, and cryptochrome (CRY). All three proteins are activated by blue light, but their biological role is drastically different. Channelrhodopsin is a transmembrane retinylidene protein which represents the first light-activated ion channel of its kind and which is involved in primitive vision (phototaxis) of algae. LOV and CRY are flavin-binding proteins acting as photoreceptors in a variety of signal transduction mechanisms in all kingdoms of life. Beyond their biological relevance, these proteins are employed in exciting optogenetic applications. We show here how IR difference absorption resolves crucial structural changes of the protein after photonic activation of the chromophore. Time-resolved techniques are introduced that cover the time range from nanoseconds to minutes along with some technical considerations. Finally, we provide an outlook toward novel experimental approaches that are currently developed in our laboratories or are just in our minds ("Gedankenexperimente"). We believe that some of them have the potential to provide new science.
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Affiliation(s)
- Tilman Kottke
- Department of Chemistry, Physical and Biophysical Chemistry, Bielefeld University , Universitätsstraße 25, 33615 Bielefeld, Germany
| | | | - Joachim Heberle
- Experimental Molecular Biophysics, Freie Universität Berlin , Arnimalle 14, 14195 Berlin, Germany
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46
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Towards label-free mid-infrared protein assays: in-situ formation of bare gold nanoparticles for surface enhanced infrared absorption spectroscopy of bovine serum albumin. Mikrochim Acta 2016. [DOI: 10.1007/s00604-016-2031-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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47
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Kraack JP, Hamm P. Surface-Sensitive and Surface-Specific Ultrafast Two-Dimensional Vibrational Spectroscopy. Chem Rev 2016; 117:10623-10664. [DOI: 10.1021/acs.chemrev.6b00437] [Citation(s) in RCA: 95] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Jan Philip Kraack
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057, Zurich, Switzerland
| | - Peter Hamm
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057, Zurich, Switzerland
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48
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Zeng L, Wu L, Liu L, Jiang X. Analyzing Structural Properties of Heterogeneous Cardiolipin-Bound Cytochrome C and Their Regulation by Surface-Enhanced Infrared Absorption Spectroscopy. Anal Chem 2016; 88:11727-11733. [DOI: 10.1021/acs.analchem.6b03360] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Li Zeng
- State
Key Laboratory of Electroanalytical Chemistry, Changchun Institute
of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Lie Wu
- State
Key Laboratory of Electroanalytical Chemistry, Changchun Institute
of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, China
| | - Li Liu
- State
Key Laboratory of Electroanalytical Chemistry, Changchun Institute
of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, China
| | - Xiue Jiang
- State
Key Laboratory of Electroanalytical Chemistry, Changchun Institute
of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, China
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49
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Fallah MA, Stanglmair C, Pacholski C, Hauser K. Devising Self-Assembled-Monolayers for Surface-Enhanced Infrared Spectroscopy of pH-Driven Poly-l-lysine Conformational Changes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:7356-64. [PMID: 27389421 DOI: 10.1021/acs.langmuir.6b01742] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Surface-enhanced infrared absorption spectroscopy (SEIRA) is applied to study protein conformational changes. In general, the appropriate functionalization of metal surfaces with biomolecules remains a challenge if the conformation and activity of the biomolecule shall be preserved. Here we present a SEIRA study to monitor pH-induced conformational changes of poly-l-lysine (PLL) covalently bound to a thin gold layer via self-assembled monolayers (SAMs). We demonstrate that the composition of the SAM is crucial. A SAM of 11-mercaptoundecanonic acid (MUA) can link PLL to the gold layer, but pH-driven conformational transitions were hindered compared to poly-l-lysine in solution. To address this problem, we devised a variety of SAMs, i.e., mixed SAMs of MUA with either octanethiol (OT) or 11-mercapto-1-undecanol (MUoL) and furthermore SAMs of MT(PEG)4 and NHS-PEG10k-SH. These mixed SAMs modify the surface properties by changing the polarity and the morphology of the surface present to nearby PLL molecules. Our experiments reveal that mixed SAMs of MUA-MUoL and SAMs of NHS-PEG10k-SH-MT(PEG)4 are suitable to monitor pH-driven conformational changes of immobilized PLL. These SAMs might be applicable for chemoselective protein immobilization in general.
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Affiliation(s)
- Mohammad A Fallah
- Department of Chemistry, University of Konstanz , 78457 Konstanz, Germany
| | - Christoph Stanglmair
- Max Planck Institute for Intelligent Systems , Department of New Materials and Biosystems, 70569 Stuttgart, Germany
| | - Claudia Pacholski
- Max Planck Institute for Intelligent Systems , Department of New Materials and Biosystems, 70569 Stuttgart, Germany
| | - Karin Hauser
- Department of Chemistry, University of Konstanz , 78457 Konstanz, Germany
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50
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Kinetics of cytochrome c oxidase from R. sphaeroides initiated by direct electron transfer followed by tr-SEIRAS. Bioelectrochemistry 2016; 112:1-8. [PMID: 27398977 DOI: 10.1016/j.bioelechem.2016.06.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2016] [Revised: 06/18/2016] [Accepted: 06/24/2016] [Indexed: 11/20/2022]
Abstract
Time-resolved surface-enhanced IR-absorption spectroscopy (tr-SEIRAS) has been performed on cytochrome c oxidase from Rhodobacter sphaeroides. The enzyme was converted electrochemically into the fully reduced state. Thereafter, in the presence of oxygen, the potential was switched to open circuit potential (OCP). Under these conditions, the enzyme is free to undergo enzymatic oxidation in the absence of an external electric field. Tr-SEIRAS was performed using the step-scan technique, triggered by periodic potential pulses switching between - 800mV and OCP. Single bands were resolved in a broad band in the amide I region using phase sensitive detection. Amplitudes of these bands were analyzed as a function of time. Time constants in the ms time scale were considered in terms of conformational changes of the protein secondary structures associated with the enzymatic turnover of the protein.
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