51
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Shutov AD, Petrov GV, Wang DW, Scully MO, Yakovlev VV. Highly efficient tunable picosecond deep ultraviolet laser system for Raman spectroscopy. OPTICS LETTERS 2019; 44:5760-5763. [PMID: 31774773 PMCID: PMC7426198 DOI: 10.1364/ol.44.005760] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2019] [Accepted: 10/30/2019] [Indexed: 05/14/2023]
Abstract
We present a narrowband laser system tunable from 219 to 236 nm for deep ultraviolet (DUV) Raman spectroscopy. The demonstrated laser system produces 6.7 ps nearly transform-limited pulses with energy up to 0.36 µJ at 100 kHz repetition rate. The system consists of a two-stage optical parametric amplifier (OPA) of a narrowband continuous wave diode laser and subsequent frequency conversion to the DUV radiation. We achieve more than 300 mW in the signal wave using ${{\rm LiB}_3}{{\rm O}_5}$LiB3O5 (LBO) and ${{\rm BaB}_2}{{\rm O}_4}$BaB2O4 (BBO) crystals, with the total 2.7 W pump after the two-stage OPA. We reach 12% conversion efficiency of the OPA signal wave into the DUV radiation using type-I phase matching in the BBO crystal. Finally, we demonstrate the applicability of the system for DUV Raman spectroscopy by collecting a high dynamic range, high spectral resolution spontaneous Raman spectrum of air.
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Affiliation(s)
- Anton D. Shutov
- Texas A&M University, 4242 TAMU, College Station, Texas 77840, USA
| | - Georgi V. Petrov
- Texas A&M University, 4242 TAMU, College Station, Texas 77840, USA
| | - Da-Wei Wang
- Interdisciplinary Center of Quantum Information and Zhejiang Province Key Laboratory of Quantum Technology and Device, Department of Physics and State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310027, China
| | - Marlan O. Scully
- Texas A&M University, 4242 TAMU, College Station, Texas 77840, USA
- Baylor University, 1301 S University Parks Dr, Waco, Texas 76706, USA
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52
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Tian KZ, Cao CC, Nie XM, Wang W, Han CQ. Sensitive and label-free detection of protein secondary structure by amide III spectral signals using surface-enhanced Raman spectroscopy. CHINESE J CHEM PHYS 2019. [DOI: 10.1063/1674-0068/cjcp1811267] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Kang-zhen Tian
- Jiangsu Key Laboratory of Advanced Laser Materials and Devices, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116, China
| | - Chang-chun Cao
- The 95979 Army of Chinese People’s Liberation Army, Taian 271200, China
| | - Xin-ming Nie
- Jiangsu Key Laboratory of Advanced Laser Materials and Devices, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116, China
| | - Wen Wang
- Jiangsu Key Laboratory of Advanced Laser Materials and Devices, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116, China
| | - Cai-qin Han
- Jiangsu Key Laboratory of Advanced Laser Materials and Devices, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116, China
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53
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Schack MM, Dahl K, Rades T, Groenning M, Carpenter JF. Spectroscopic Evidence of Tertiary Structural Differences Between Insulin Molecules in Fibrils. J Pharm Sci 2019; 108:2871-2879. [DOI: 10.1016/j.xphs.2019.04.018] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2018] [Revised: 04/01/2019] [Accepted: 04/10/2019] [Indexed: 11/29/2022]
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54
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Chen J, Chen J, Liu Y, Zheng Y, Zhu Q, Han G, Shen JR. Proton-Coupled Electron Transfer of Plastoquinone Redox Reactions in Photosystem II: A Pump-Probe Ultraviolet Resonance Raman Study. J Phys Chem Lett 2019; 10:3240-3247. [PMID: 31117681 DOI: 10.1021/acs.jpclett.9b00959] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Plastoquinones (PQs) act as electron and proton mediators in photosystem II (PSII) for solar-to-chemical energy conversion. It is known that the redox potential of PQ varies in a wide range spanning hundreds of millivolts; however, its structural origin is not known yet. Here, by developing a pump-probe ultraviolet resonance Raman technique, we measured the vibrational structures of PQs including QA and QB in cyanobacterial PSII directly. The conversion of QA to QA•- in the Mn-depleted PSII is verified by direct observation of the distinct QA•- vibrational bands. A frequency upshift of the ring C=O/C=C stretch band at 1565 cm-1 for QA•- was observed, which suggests a π-π interaction between the quinone ring and Trp253. In contrast, proton-coupled reduction of QA to QAH upon light-driven electron transfer is demonstrated in PSII without QB bound. The H-bond between QA and His214 is likely the proton origin of this proton-coupled electron transfer.
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Affiliation(s)
- Jun Chen
- Science and Technology on Surface Physics and Chemistry Laboratory , Jiangyou 621908 , China
- State Key Laboratory of Catalysis , Dalian Institute of Chemical Physics, Chinese Academy of Sciences , Dalian 116023 , China
| | - Jinfan Chen
- Science and Technology on Surface Physics and Chemistry Laboratory , Jiangyou 621908 , China
| | - Ying Liu
- Institute of Materials , China Academy of Engineering Physics , Mianyang 621907 , China
| | - Yang Zheng
- State Key Laboratory of Catalysis , Dalian Institute of Chemical Physics, Chinese Academy of Sciences , Dalian 116023 , China
| | - Qingjun Zhu
- Photosynthesis Research Center, Key Laboratory of Photobiology , Institute of Botany, Chinese Academy of Sciences , No. 20, Nanxincun , Xiangshan, Beijing , 100093 , China
| | - Guangye Han
- Photosynthesis Research Center, Key Laboratory of Photobiology , Institute of Botany, Chinese Academy of Sciences , No. 20, Nanxincun , Xiangshan, Beijing , 100093 , China
| | - Jian-Ren Shen
- Photosynthesis Research Center, Key Laboratory of Photobiology , Institute of Botany, Chinese Academy of Sciences , No. 20, Nanxincun , Xiangshan, Beijing , 100093 , China
- Research Institute of Interdisciplinary Science, Graduate School of Natural Science and Technology , Okayama University , Tsushima Naka 3-1-1 , Okayama 700-8530 , Japan
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55
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de Souza B, Farias G, Neese F, Izsák R. Efficient simulation of overtones and combination bands in resonant Raman spectra. J Chem Phys 2019; 150:214102. [DOI: 10.1063/1.5099247] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Bernardo de Souza
- Departmento de Química, Universidade Federal de Santa Catarina, Santa Catarina, Brazil
| | - Giliandro Farias
- Departmento de Química, Universidade Federal de Santa Catarina, Santa Catarina, Brazil
| | - Frank Neese
- Max-Planck-Institut für Kohlenforschung, Mülheim an der Ruhr, Germany
| | - Róbert Izsák
- Max-Planck-Institut für Kohlenforschung, Mülheim an der Ruhr, Germany
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56
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Catalini S, Rossi B, Foggi P, Masciovecchio C, Bruni F. Aqueous solvation of glutathione probed by UV resonance Raman spectroscopy. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.03.113] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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57
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Jakubek RS, Workman RJ, White SE, Asher SA. Polyglutamine Solution-State Structural Propensity Is Repeat Length Dependent. J Phys Chem B 2019; 123:4193-4203. [PMID: 31008597 DOI: 10.1021/acs.jpcb.9b01433] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Expanded polyglutamine (polyQ) tracts in proteins, which are known to induce their aggregation, are associated with numerous neurodegenerative diseases. Longer polyQ tracts correlate with faster protein aggregation kinetics and a decreased age of onset for polyQ disease symptoms. Here, we use UV resonance Raman spectroscopy, circular dichroism spectroscopy, and metadynamics simulations to investigate the solution-state structures of the D2Q15K2 (Q15) and D2Q20K2 (Q20) peptides. Using metadynamics, we explore the conformational energy landscapes of Q15 and Q20 and investigate the relative energies and activation barriers between these low-energy structures. We compare the solution-state structures of D2Q10K2 (Q10), Q15, and Q20 to determine the dependence of polyQ structure on the Q tract length. We show that these peptides can adopt two distinct monomeric conformations: an aggregation-resistant PPII-like conformation and an aggregation-prone β-strand-like conformation. We find that longer polyQ peptides have an increased preference for the aggregation-prone β-strand-like conformation. This preference may play an important role in the increased aggregation rate of longer polyQ peptides that is thought to lead to decreased neurodegenerative disease age of onset for polyQ disease patients.
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Affiliation(s)
| | - Riley J Workman
- Department of Chemistry and Biochemistry, Center for Computational Sciences , Duquesne University , Pittsburgh , Pennsylvania 15282 , United States
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Khatun S, Singh A, Pawar N, Gupta AN. Aggregation of amylin: Spectroscopic investigation. Int J Biol Macromol 2019; 133:1242-1248. [PMID: 31028814 DOI: 10.1016/j.ijbiomac.2019.04.167] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Revised: 04/12/2019] [Accepted: 04/23/2019] [Indexed: 12/17/2022]
Abstract
Apart from its relevance to pathology, protein misfolding disease like Type-II Diabetes Mellitus, caused by amyloids of amylin protein has attracted more attention due to structural changes occurring during the aggregation process. We report extensive spectroscopy data of amylin during fibril formation through Raman, FTIR, CD, UV-vis absorption and photoluminescence (PL) spectroscopy. UV-vis and PL spectrum showed the sigmoidal growth of fibril with a lag time of ~2 days, which is consistent with earlier reported work using dynamic light scattering (DLS). Raman spectra revealed the formation of parallel and anti-parallel β-sheet from 0% to 20% with ageing (1st day to 21st day) at pH 6.5 ± 0.1. The results are corroborated by CD and FTIR data. These show the change in β-sheet by 23% at pH 6.5 ± 0.1, 26% at pH = 1.0 ± 0.1 and 30% at pH = 12 ± 0.1. It is also shown that the formation and conversion of other secondary structures into β-sheet is very sensitive towards the pH and ageing. The study may be used for the development of therapeutic strategies that could inhibit or even reverse the process of aggregation.
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Affiliation(s)
- Suparna Khatun
- Biophysics and Soft Matter Laboratory, Department of Physics, Indian Institute of Technology Kharagpur, 721302, India
| | - Anurag Singh
- Biophysics and Soft Matter Laboratory, Department of Physics, Indian Institute of Technology Kharagpur, 721302, India
| | - Nisha Pawar
- Biophysics and Soft Matter Laboratory, Department of Physics, Indian Institute of Technology Kharagpur, 721302, India
| | - Amar Nath Gupta
- Biophysics and Soft Matter Laboratory, Department of Physics, Indian Institute of Technology Kharagpur, 721302, India.
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59
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Ratha BN, Kar RK, Kalita S, Kalita S, Raha S, Singha A, Garai K, Mandal B, Bhunia A. Sequence specificity of amylin-insulin interaction: a fragment-based insulin fibrillation inhibition study. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2019; 1867:405-415. [DOI: 10.1016/j.bbapap.2019.01.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2018] [Revised: 01/03/2019] [Accepted: 01/13/2019] [Indexed: 01/10/2023]
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60
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Ma J, Zhang X, Phillips DL. Time-Resolved Spectroscopic Observation and Characterization of Water-Assisted Photoredox Reactions of Selected Aromatic Carbonyl Compounds. Acc Chem Res 2019; 52:726-737. [PMID: 30742408 DOI: 10.1021/acs.accounts.8b00619] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
In recent years, unusual and efficient self-photoredox reactions were detected for selected benzophenone derivatives (BPs) and anthraquinone derivatives (AQs) in aqueous environments by Wan and co-workers, where the carbonyl undergoes reduction to the corresponding alcohol and a side-chain alcohol group undergoes oxidation to the corresponding carbonyl. To unravel the photoredox reaction mechanisms of these types of BPs and AQs in aqueous environments, we have utilized a combination of time-resolved spectroscopy techniques such as femtosecond transient absorption, nanosecond transient absorption, and nanosecond time-resolved resonance Raman spectroscopy to detect and characterize the electronic absorption and vibrational spectra of the intermediates and transient species from the femtosecond to microsecond time region after they are generated in the photoredox reactions. With the assistance of density functional theory calculations to simulate the electronic absorption and Raman spectra, the structural and kinetic information on the key reactive intermediates is described. Furthermore, the reaction pathways were calculated by finding the transition states connecting with the reactant and product complexes to better understand the photoredox reaction mechanism. In this Account, we summarize some of our time-resolved spectroscopic observations and characterization of water-assisted photoredox reactions of selected BPs and AQs. In the strong hydrogen-donor solvent isopropanol, the commonly studied photoreduction reaction for aromatic carbonyls via an intermolecular hydrogen atom tranfer process was observed for BPs and AQs. The photoredox reactions for the investigated BPs and AQs in aqueous environments occur on the triplet excited-state surface. Under moderately acidic aqueous conditions, the photoredox reactions for BPs and AQs are triggered by a proton transfer (PT) pathway. In neutral aqueous solutions, AQs may also undergo proton-coupled electron transfer (PCET) leading to the photoredox reaction, while BPs generate the ketyl radical species. Both BPs and AQs prefer the photohydration reaction in high-proton-concentration aqueous solutions (pH 0). The PT and PCET processes were found to offer more possibilities for the aromatic carbonyl compounds to lead to new photochemical reactions like the unusual photoredox reactions associated with BPs and AQs described here. Clear characterization of the photophysical pathways and the photochemical reactions of representative aromatic carbonyl compounds in aqueous environments not only provides fundamental information to better understand the photochemistry of carbonyl-containing compounds but also will facilitate the development of applications of these systems, like photochemical synthesis, drugs, and photolabile protecting groups. In addition, the importance of water molecules in the photochemical reactions of interest here may also lead to further understanding of how water influences the photochemistry of related carbonyl-containing compounds in aqueous environments.
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Affiliation(s)
- Jiani Ma
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi’an 710127, P. R. China
| | - Xiting Zhang
- Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China
| | - David Lee Phillips
- Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China
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61
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Zhao J, Wu J, Yang Z, Ouyang L, Zhu L, Gao Z, Li H. Nitration of hIAPP promotes its toxic oligomer formation and exacerbates its toxicity towards INS-1 cells. Nitric Oxide 2019; 87:23-30. [PMID: 30849493 DOI: 10.1016/j.niox.2019.02.010] [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] [Received: 09/19/2018] [Revised: 02/27/2019] [Accepted: 02/28/2019] [Indexed: 01/09/2023]
Abstract
Amyloid formation of human islet amyloid polypeptide (hIAPP) is one of the most common pathological features of type 2 diabetes (T2D). Increasing evidences have shown that the overproduction of reactive oxygen species (ROS) and reactive nitrogen species (RNS) play an important role in the development of the T2D. Interestingly, our previous studies indicated that heme could bind to hIAPP, and the complex might induce the nitration of tyrosine residue (Y37) of hIAPP in the presence of hydrogen peroxide and nitrite. However, it remains unclear about effect of the nitration on the implicated function of hIAPP in the development of T2D. In this study, fluorescent assays, transmission electron microscopy (TEM), atomic force microscope (AFM) were used to demonstrate that nitration of hIAPP significantly decreased its fibril formation. But the decreased fibril formation was not through the diminished aggregation of hIAPP monomer as suggested by the results of circular dichroism spectroscopy (CD) and gel electrophoresis assay. Surface-enhanced raman spectroscopy (SERS) indicated that nitration of hIAPP impaired the intermolecular hydrogen bonding. On the basis of these results, we hypothesize that nitration of hIAPP may block the intermolecular hydrogen bonding, leading to the inhibition of its fibril formation. In addition, cytotoxicity study of native and modified hIAPP was also performed on INS-1 cells, which revealed exacerbated toxicity of hIAPP by its nitration. The findings in this study that nitration of hIAPP promotes its oligomer formation and thus exacerbates its cytotoxicity suggests a possible link between the nitrite (or the sum of nitrite and nitrate) levels and T2D, and ameliorated nitration of hIAPP by diminishing nitrative stress might be a promising therapeutic strategy for T2D.
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Affiliation(s)
- Jie Zhao
- Hubei Key Laboratory of Bioinorganic Chemistry & Materia Medica, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, 430074, People's Republic of China
| | - Jinming Wu
- Hubei Key Laboratory of Bioinorganic Chemistry & Materia Medica, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, 430074, People's Republic of China
| | - Zhen Yang
- Hubei Key Laboratory of Bioinorganic Chemistry & Materia Medica, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, 430074, People's Republic of China; Center for Bioenergetics, Houston Methodist Research Institute, Houston, TX, 77030, United States
| | - Lei Ouyang
- Hubei Key Laboratory of Bioinorganic Chemistry & Materia Medica, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, 430074, People's Republic of China
| | - Lihua Zhu
- Hubei Key Laboratory of Bioinorganic Chemistry & Materia Medica, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, 430074, People's Republic of China
| | - Zhonghong Gao
- Hubei Key Laboratory of Bioinorganic Chemistry & Materia Medica, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, 430074, People's Republic of China.
| | - Hailing Li
- Hubei Key Laboratory of Bioinorganic Chemistry & Materia Medica, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, 430074, People's Republic of China.
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62
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Jakubek RS, White SE, Asher SA. UV Resonance Raman Structural Characterization of an (In)soluble Polyglutamine Peptide. J Phys Chem B 2019; 123:1749-1763. [PMID: 30717595 DOI: 10.1021/acs.jpcb.8b10783] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Fibrillization of polyglutamine (polyQ) tracts in proteins is implicated in at least 10 neurodegenerative diseases. This generates great interest in the structure and the aggregation mechanism(s) of polyQ peptides. The fibrillization of polyQ is thought to result from the peptide's insolubility in aqueous solutions; longer polyQ tracts show decreased aqueous solution solubility, which is thought to lead to faster fibrillization kinetics. However, few studies have characterized the structure(s) of polyQ peptides with low solubility. In the work here, we use UV resonance Raman spectroscopy to examine the secondary structures, backbone hydrogen bonding, and side chain hydrogen bonding for a variety of solution-state, solid, and fibril forms of D2Q20K2 (Q20). Q20 is insoluble in water and has a β-strand-like conformation with extensive inter- and intrapeptide hydrogen bonding in both dry and aqueous environments. We find that Q20 has weaker backbone-backbone and backbone-side chain hydrogen bonding and is less ordered compared to that of polyQ fibrils. Interestingly, we find that the insoluble Q20 will form fibrils when incubated in water at room temperature for ∼5 h. Also, Q20 can be prepared using a well-known disaggregation procedure to produce a water-soluble PPII-like conformation with negligible inter- and intrapeptide hydrogen bonding and a resistance to aggregation.
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63
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Ma X, Hua J, Wang K, Zhang H, Zhang C, He Y, Guo Z, Wang X. Modulating Conformation of Aβ-Peptide: An Effective Way to Prevent Protein-Misfolding Disease. Inorg Chem 2018; 57:13533-13543. [PMID: 30345755 DOI: 10.1021/acs.inorgchem.8b02115] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Alzheimer's disease (AD) is a typical protein-misfolding disease. Aggregation of amyloid β-peptide (Aβ) plays a key role in the etiology of AD. The misfolding of Aβ results in the formation of β-sheet-rich aggregates and damages the function of neurons. A modified polyoxometalate (POM), [CoL(H2O)]2[CoL]2[HAsVMoV6MoVI6O40] [CAM, L = 2-(1 H-pyrazol-3-yl)pyridine], was designed to disaggregate the Aβ aggregates, where L acts as an Aβ-targeting group and POM as a conformational modulator. X-ray crystallography shows that CAM is composed of a ε-Keggin unit and four coordination units. CAM can disaggregate the β-sheet-rich fibrils and metal-induced or self-aggregated Aβ aggregates, and it further inhibits the production of ROS; as a result, it can protect the neurons from synaptic toxicity induced by Zn2+- or Cu2+-Aβ aggregates or Aβ self-aggregation. The mechanism of disaggregation involves a transformation of Aβ conformation from β-sheet to other conformers. The nature of the process is an interference of the β-sheet conformation by CAM via hydrogen bonding. CAM specifically interacts with Aβ aggregates but does not disturb the cerebral metal homeostasis and enzymatic systems. Molecular simulation suggests that the appropriate size of CAM and the cavity of β-sheets facilitate the interaction between CAM and Aβ aggregates; additionally, the H-bonding-favored amino acid residues in the cavity provide a precondition for the interaction. Moreover, CAM is lipophilic and capable of penetrating the blood-brain barrier, and it is metabolizable without causing an untoward effect to mice at high dosages. In view of the significant inhibitory effect on the Aβ aggregation and related neurotoxicity, CAM represents a new type of leading compounds with a distinctive mechanism of action for the treatment of Alzheimer' disease. The conception of this study may be applied to other protein-misfolding diseases caused by conformational changes.
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Affiliation(s)
- Xiang Ma
- State Key Laboratory of Coordination Chemistry , School of Chemistry and Chemical Engineering , Nanjing University , Nanjing 210023 , P. R. China.,Chemistry and Chemical Engineering Department , Taiyuan Institute of Technology , Taiyuan 030008 , P. R. China
| | - Jiai Hua
- Chemistry and Chemical Engineering Department , Taiyuan Institute of Technology , Taiyuan 030008 , P. R. China
| | - Kun Wang
- State Key Laboratory of Coordination Chemistry , School of Chemistry and Chemical Engineering , Nanjing University , Nanjing 210023 , P. R. China
| | - Hongmei Zhang
- State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences , Nanjing University , Nanjing 210023 , P. R. China
| | - Changli Zhang
- School of Biochemical and Environmental Engineering , Nanjing Xiaozhuang University , Nanjing 210017 , P. R. China
| | - Yafeng He
- State Key Laboratory of Coordination Chemistry , School of Chemistry and Chemical Engineering , Nanjing University , Nanjing 210023 , P. R. China
| | - Zijian Guo
- State Key Laboratory of Coordination Chemistry , School of Chemistry and Chemical Engineering , Nanjing University , Nanjing 210023 , P. R. China
| | - Xiaoyong Wang
- State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences , Nanjing University , Nanjing 210023 , P. R. China
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64
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Tian B, Cheng C, Yue T, Lin N, Ren H. Chemical identification of the amyloid peptide aggregation-prone Al(III)-peptide complexes by resonance Raman signatures: A computational study. Chem Phys 2018. [DOI: 10.1016/j.chemphys.2018.06.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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65
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Martial B, Lefèvre T, Auger M. Understanding amyloid fibril formation using protein fragments: structural investigations via vibrational spectroscopy and solid-state NMR. Biophys Rev 2018; 10:1133-1149. [PMID: 29855812 PMCID: PMC6082320 DOI: 10.1007/s12551-018-0427-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2018] [Accepted: 05/17/2018] [Indexed: 12/11/2022] Open
Abstract
It is well established that amyloid proteins play a primary role in neurodegenerative diseases. Alzheimer's, Parkinson's, type II diabetes, and Creutzfeldt-Jakob's diseases are part of a wider family encompassing more than 50 human pathologies related to aggregation of proteins. Although this field of research is thoroughly investigated, several aspects of fibrillization remain misunderstood, which in turn slows down, or even impedes, advances in treating and curing amyloidoses. To solve this problem, several research groups have chosen to focus on short fragments of amyloid proteins, sequences that have been found to be of great importance for the amyloid formation process. Studying short peptides allows bypassing the complexity of working with full-length proteins and may provide important information relative to critical segments of amyloid proteins. To this end, efficient biophysical tools are required. In this review, we focus on two essential types of spectroscopic techniques, i.e., vibrational spectroscopy and its derivatives (conventional Raman scattering, deep-UV resonance Raman (DUVRR), Raman optical activity (ROA), surface-enhanced Raman spectroscopy (SERS), tip-enhanced Raman spectroscopy (TERS), infrared (IR) absorption spectroscopy, vibrational circular dichroism (VCD)) and solid-state nuclear magnetic resonance (ssNMR). These techniques revealed powerful to provide a better atomic and molecular comprehension of the amyloidogenic process and fibril structure. This review aims at underlining the information that these techniques can provide and at highlighting their strengths and weaknesses when studying amyloid fragments. Meaningful examples from the literature are provided for each technique, and their complementarity is stressed for the kinetic and structural characterization of amyloid fibril formation.
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Affiliation(s)
- Benjamin Martial
- Department of Chemistry, Regroupement québécois de recherche sur la fonction, l'ingénierie et les applications des protéines (PROTEO), Centre de recherche sur les matériaux avancés (CERMA), Centre québécois sur les matériaux fonctionnels (CQMF), Université Laval, Québec, QC, G1V 0A6, Canada
| | - Thierry Lefèvre
- Department of Chemistry, Regroupement québécois de recherche sur la fonction, l'ingénierie et les applications des protéines (PROTEO), Centre de recherche sur les matériaux avancés (CERMA), Centre québécois sur les matériaux fonctionnels (CQMF), Université Laval, Québec, QC, G1V 0A6, Canada
| | - Michèle Auger
- Department of Chemistry, Regroupement québécois de recherche sur la fonction, l'ingénierie et les applications des protéines (PROTEO), Centre de recherche sur les matériaux avancés (CERMA), Centre québécois sur les matériaux fonctionnels (CQMF), Université Laval, Québec, QC, G1V 0A6, Canada.
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66
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A novel “modularized” optical sensor for pH monitoring in biological matrixes. Biosens Bioelectron 2018; 109:150-155. [DOI: 10.1016/j.bios.2018.02.052] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2017] [Revised: 02/06/2018] [Accepted: 02/24/2018] [Indexed: 11/18/2022]
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67
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Tao Y, Wu Y, Zhang L. Advancements of two dimensional correlation spectroscopy in protein researches. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2018; 197:185-193. [PMID: 29409703 DOI: 10.1016/j.saa.2018.01.039] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2017] [Revised: 01/09/2018] [Accepted: 01/13/2018] [Indexed: 05/26/2023]
Abstract
The developments of two-dimensional correlation spectroscopy (2DCOS) applications in protein studies are discussed, especially for the past two decades. The powerful utilities of 2DCOS combined with various analytical techniques in protein studies are summarized. The emphasis is on the vibration spectroscopic techniques including IR, NIR, Raman and optical activity (ROA), as well as vibration circular dichroism (VCD) and fluorescence spectroscopy. In addition, some new developments, such as hetero-spectral 2DCOS, moving-window correlation, and model based correlation, are also reviewed for their utility in the investigation of the secondary structure, denaturation, folding and unfolding changes of protein. Finally, the new possibility and challenges of 2DCOS in protein research are highlighted as well.
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Affiliation(s)
- Yanchun Tao
- State Key Laboratory of Supramolecular Structure and Materials, Institute of Theoretical Chemistry, Jilin University, No. 2699 Qianjin Street, Changchun 130012, China
| | - Yuqing Wu
- State Key Laboratory of Supramolecular Structure and Materials, Institute of Theoretical Chemistry, Jilin University, No. 2699 Qianjin Street, Changchun 130012, China.
| | - Liping Zhang
- Department of Foundation, Jilin Business and Technology College, No. 1666 Kalunhu Street, Changchun 130507, China.
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Dolui S, Roy A, Pal U, Saha A, Maiti NC. Structural Insight of Amyloidogenic Intermediates of Human Insulin. ACS OMEGA 2018; 3:2452-2462. [PMID: 30023834 PMCID: PMC6045404 DOI: 10.1021/acsomega.7b01776] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2017] [Accepted: 02/16/2018] [Indexed: 05/27/2023]
Abstract
Engaging Raman spectroscopy as a primary tool, we investigated the early events of insulin fibrilization and determined the structural content present in oligomer and protofibrils that are formed as intermediates in the fibril formation pathway. Insulin oligomer, as obtained upon incubation of zinc-free insulin at 60 °C, was mostly spherical in shape, with a diameter of 3-5 nm. Longer incubation produced "necklace"-like beaded protofibrillar assembly species. These intermediates eventually transformed into 5-8 nm thick fibers with smooth surface texture. A broad amide I band in the Raman spectrum of insulin monomer appeared at 1659 cm-1, with a shoulder band at 1676 cm-1. This signature suggested the presence of major helical and extended secondary structure of the protein backbone. In the oligomeric state, the protein maintained its helical imprint (∼50%) and no substantial increment of the compact cross-β-sheet structure was observed. A nonamide helix signature band at 940 cm-1 was present in the oligomeric state, and it was weakened in the fibrillar structure. The 1-anilino-8-naphthalene-sulfonate binding study strongly suggested that a collapse in the tertiary structure, not the major secondary structural realignment, was the dominant factor in the formation of oligomers. In the fibrillar state, the contents of helical and disordered secondary structures decreased significantly and the β-sheet amount increased to ∼62%. The narrow amide I Raman band at 1674 cm-1 in the fibrillar state connoted the formation of vibrationally restricted highly organized β-sheet structure with quaternary realignment into steric-zipped species.
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Affiliation(s)
- Sandip Dolui
- Structural
Biology and Bioinformatics Division, Indian
Institute of Chemical Biology, Council of Scientific and Industrial
Research, 4, Raja S.C. Mullick Road, Kolkata 700032, India
| | - Anupam Roy
- Structural
Biology and Bioinformatics Division, Indian
Institute of Chemical Biology, Council of Scientific and Industrial
Research, 4, Raja S.C. Mullick Road, Kolkata 700032, India
| | - Uttam Pal
- Chemical
Sciences Division, Saha Institute of Nuclear
Physics, 1/AF Bidhannagar, Kolkata 700064, India
| | - Achintya Saha
- Department
of Chemical Technology, University of Calcutta, 92 Acharya Prafulla Chandra Road, Calcutta 700009, India
| | - Nakul C. Maiti
- Structural
Biology and Bioinformatics Division, Indian
Institute of Chemical Biology, Council of Scientific and Industrial
Research, 4, Raja S.C. Mullick Road, Kolkata 700032, India
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69
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Ren H, Zhang Y, Guo S, Lin N, Deng L, Yue T, Huang F. Identifying Cu(ii)-amyloid peptide binding intermediates in the early stages of aggregation by resonance Raman spectroscopy: a simulation study. Phys Chem Chem Phys 2018; 19:31103-31112. [PMID: 29138762 DOI: 10.1039/c7cp06206k] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The aggregation of amyloid beta (Aβ) peptides plays a crucial role in the pathology and etiology of Alzheimer's disease. Experimental evidence shows that copper ion is an aggregation-prone species with the ability to coordinately bind to Aβ and further induce the formation of neurotoxic Aβ oligomers. However, the detailed structures of Cu(ii)-Aβ complexes have not been illustrated, and the kinetics and dynamics of the Cu(ii) binding are not well understood. Two Cu(ii)-Aβ complexes have been proposed to exist under physiological conditions, and another two might exist at higher pH values. By using ab initio simulations for the spontaneous resonance Raman and time domain stimulated resonance Raman spectroscopy signals, we obtained the characteristic Raman vibronic features of each complex. These signals contain rich structural information with high temporal resolution, enabling the characterization of transient states during the fast Cu-Aβ binding and interconversion processes.
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Affiliation(s)
- Hao Ren
- State Key Laboratory of Heavy Oil Processing, Center for Bioengineering & Biotechnology, China University of Petroleum (East China), Qingdao, 266580, P. R. China.
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70
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Wu Y, Zhang L, Jung YM, Ozaki Y. Two-dimensional correlation spectroscopy in protein science, a summary for past 20years. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2018; 189:291-299. [PMID: 28823970 DOI: 10.1016/j.saa.2017.08.014] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2017] [Accepted: 08/04/2017] [Indexed: 05/26/2023]
Abstract
Two-dimensional correlation spectroscopy (2DCOS) has been widely used to Infrared, Raman, Near IR, Optical Activity (ROA), Vibrational Circular Dichroism (VCD) and Fluorescence spectroscopy. In addition, several new developments, such as 2D hetero-correlation analysis, moving-window two-dimensional (MW2D) correlation, model based correlation (βν and kν correlation analyses) have also well incorporated into protein research. They have been used to investigate secondary structure, denaturation, folding and unfolding changes of protein, and have contributed greatly to the field of protein science. This review provides an overview of the applications of 2DCOS in the field of protein science for the past 20 year, especially to memory our old friend, Dr. Boguslawa Czarnik-Matusewicz, for her great contribution in this research field. The powerful utility of 2DCOS combined with various analytical techniques in protein studies is summarized. The noteworthy developments and perspective of 2DCOS in this field are highlighted finally.
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Affiliation(s)
- Yuqing Wu
- State Key Laboratory of Supramolecular Structure and Materials, Institute of Theoretical Chemistry, Jilin University, No. 2699 Qianjin Street, Changchun 130012, China
| | - Liping Zhang
- Department of Foundation, Jilin Business and Technology College, No. 1666 Kalunhu Street, Changchun 130507, China.
| | - Young Mee Jung
- Department of Chemistry, Institute for Molecular Science and Fusion Technology, Kangwon National University, Chuncheon 24341, Republic of Korea
| | - Yukihiro Ozaki
- School of Science and Technology, Kwansei-Gakuin University, 2-1 Gakuen, Sanda, Hyogo 669-1337, Japan
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71
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Abstract
UV resonance Raman (UVRR) spectroscopy is a powerful tool for investigating the structure of biological molecules, such as proteins. Numerous UVRR spectroscopic markers that provide information on the structure and environment of the protein backbone and of amino acid side chains have recently been discovered. Combining these UVRR markers with hydrogen-deuterium exchange and advanced statistics is a powerful tool for studying protein systems, including the structure and formation mechanism of protein aggregates and amyloid fibrils. These techniques allow crucial new insights into the structure and dynamics of proteins, such as polyglutamine peptides, which are associated with 10 different neurodegenerative diseases. Here we summarize the spectroscopic structural markers recently developed and the important insights they provide.
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Meister K, Paananen A, Speet B, Lienemann M, Bakker HJ. Molecular Structure of Hydrophobins Studied with Site-Directed Mutagenesis and Vibrational Sum-Frequency Generation Spectroscopy. J Phys Chem B 2017; 121:9398-9402. [PMID: 28967753 PMCID: PMC5647563 DOI: 10.1021/acs.jpcb.7b08865] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2017] [Revised: 09/14/2017] [Indexed: 01/31/2023]
Abstract
Hydrophobins are surface-active fungal proteins that adsorb to the water-air interface and self-assemble into amphiphilic, water-repelling films that have a surface elasticity that is an order of magnitude higher than other molecular films. Here we use surface-specific sum-frequency generation spectroscopy (VSFG) and site-directed mutagenesis to study the properties of class I hydrophobin (HFBI) films from Trichoderma reesei at the molecular level. We identify protein specific HFBI signals in the frequency region 1200-1700 cm-1 that have not been observed in previous VSFG studies on proteins. We find evidence that the aspartic acid residue (D30) next to the hydrophobic patch is involved in lateral intermolecular protein interactions, while the two aspartic acid residues (D40, D43) opposite to the hydrophobic patch are primarily interacting with the water solvent.
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Affiliation(s)
- K. Meister
- AMOLF, Science Park 104, 1098 XG Amsterdam, The Netherlands
| | - A. Paananen
- VTT Technical Research Centre of Finland Ltd, Tietotie, FI-02150 Espoo, Finland
| | - B. Speet
- AMOLF, Science Park 104, 1098 XG Amsterdam, The Netherlands
| | - M. Lienemann
- VTT Technical Research Centre of Finland Ltd, Tietotie, FI-02150 Espoo, Finland
| | - H. J. Bakker
- AMOLF, Science Park 104, 1098 XG Amsterdam, The Netherlands
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73
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Feliu N, Hassan M, Garcia Rico E, Cui D, Parak W, Alvarez-Puebla R. SERS Quantification and Characterization of Proteins and Other Biomolecules. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:9711-9730. [PMID: 28826207 DOI: 10.1021/acs.langmuir.7b01567] [Citation(s) in RCA: 84] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Changes in protein expression levels and protein structure may indicate genomic mutations and may be related to some diseases. Therefore, the precise quantification and characterization of proteins can be used for disease diagnosis. Compared with several other alternative methods, surface-enhanced Raman scattering (SERS) spectroscopy is regarded as an excellent choice for the quantification and structural characterization of proteins. Herein, we review the main advance of using plasmonic nanostructures as SERS sensing platform for this purpose. Three design approaches, including direct SERS, indirect SERS, and SERS-encoded nanoparticles, are discussed in the direction of developing new precise approaches of quantification and characterization of proteins. While this Review is focused on proteins, in order to highlight concepts of SERS-based sensors also detection of other biomolecules will be discussed.
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Affiliation(s)
- Neus Feliu
- Fachbereich Physik, Philipps Universität Marburg , 35037 Marburg, Germany
- Experimental Cancer Medicine, Department of Laboratory Medicine, Karolinska Institutet , Stockholm, 141 86 Sweden
| | - Moustapha Hassan
- Experimental Cancer Medicine, Department of Laboratory Medicine, Karolinska Institutet , Stockholm, 141 86 Sweden
| | - Eduardo Garcia Rico
- Fundacion de Investigacion HM Hospitales , San Bernardo 101, 28015 Madrid, Spain
- Centro Integral Oncologico Clara Campal (CIOCC) , Oña 10, 28050 Madrid, Spain
- Servicio de Oncologia Clinica, Hospital Universitario HM Torrelodones , Castillo de Olivares s/n, 28250 Torrelodones, Spain
- School of Medicine, San Pablo CEU , Calle Julián Romea, 18, 28003 Madrid, Spain
| | - Daxiang Cui
- Institute of Nano Biomedicine and Engineering, Key Laboratory for Thin Film and Microfabrication Technology of the Ministry of Education, Department of Instrument Science and Engineering, School of Electronic Information and Electrical Engineering, National Center for Translational Medicine, Shanghai Jiao Tong University , 200240 Shanghai, China
| | - Wolfgang Parak
- Fachbereich Physik, Philipps Universität Marburg , 35037 Marburg, Germany
- Institute of Nano Biomedicine and Engineering, Key Laboratory for Thin Film and Microfabrication Technology of the Ministry of Education, Department of Instrument Science and Engineering, School of Electronic Information and Electrical Engineering, National Center for Translational Medicine, Shanghai Jiao Tong University , 200240 Shanghai, China
- Fachbereich Physik und Chemie, Universität Hamburg , 20146 Harmburg, Germany
| | - Ramon Alvarez-Puebla
- Departamento de Química Física e Inorgánica, Universitat Rovira i Virgili , Carrer de Marcellí Domingo s/n, 43007 Tarragona, Spain
- ICREA , Passeig Lluís Companys 23, 08010 Barcelona, Spain
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74
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Drachuk I, Harbaugh S, Geryak R, Kaplan DL, Tsukruk VV, Kelley-Loughnane N. Immobilization of Recombinant E. coli Cells in a Bacterial Cellulose–Silk Composite Matrix To Preserve Biological Function. ACS Biomater Sci Eng 2017; 3:2278-2292. [DOI: 10.1021/acsbiomaterials.7b00367] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Irina Drachuk
- UES Inc., 4401 Dayton-Xenia
Road, Dayton, Ohio 45432, United States
- Air Force Research Laboratory, 711th Human Performance Wing, Airmen Systems Directorate, 2510 Fifth Street, Wright-Patterson AFB, Dayton, Ohio 45433, United States
| | - Svetlana Harbaugh
- The Henry M. Jackson Foundation, 6720A Rockledge Drive, Bethesda, Maryland 20817, United States
- Air Force Research Laboratory, 711th Human Performance Wing, Airmen Systems Directorate, 2510 Fifth Street, Wright-Patterson AFB, Dayton, Ohio 45433, United States
| | - Ren Geryak
- School
of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive NW, Atlanta, Georgia 30332, United States
| | - David L. Kaplan
- Department
of Biomedical Engineering, Tufts University, 4 Colby Street, Medford, Massachusetts 02155, United States
| | - Vladimir V. Tsukruk
- School
of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive NW, Atlanta, Georgia 30332, United States
| | - Nancy Kelley-Loughnane
- Air Force Research Laboratory, 711th Human Performance Wing, Airmen Systems Directorate, 2510 Fifth Street, Wright-Patterson AFB, Dayton, Ohio 45433, United States
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75
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Quiñones-Ruiz T, Rosario-Alomar MF, Ruiz-Esteves K, Shanmugasundaram M, Grigoryants V, Scholes C, López-Garriga J, Lednev IK. Purple Fibrils: A New Type of Protein Chromophore. J Am Chem Soc 2017; 139:9755-9758. [DOI: 10.1021/jacs.7b03056] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Tatiana Quiñones-Ruiz
- Department
of Chemistry, University at Albany, SUNY, Albany, New York 12222, United States
| | | | - Karina Ruiz-Esteves
- Department
of Chemistry, University of Puerto Rico at Mayaguez, Mayaguez, Puerto Rico 00693, United States
| | | | - Vladimir Grigoryants
- Department
of Chemistry, University at Albany, SUNY, Albany, New York 12222, United States
| | - Charles Scholes
- Department
of Chemistry, University at Albany, SUNY, Albany, New York 12222, United States
| | - Juan López-Garriga
- Department
of Chemistry, University of Puerto Rico at Mayaguez, Mayaguez, Puerto Rico 00693, United States
| | - Igor K. Lednev
- Department
of Chemistry, University at Albany, SUNY, Albany, New York 12222, United States
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76
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Punihaole D, Jakubek RS, Workman RJ, Marbella LE, Campbell P, Madura JD, Asher SA. Monomeric Polyglutamine Structures That Evolve into Fibrils. J Phys Chem B 2017; 121:5953-5967. [DOI: 10.1021/acs.jpcb.7b04060] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- David Punihaole
- Department
of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Ryan S. Jakubek
- Department
of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Riley J. Workman
- Department
of Chemistry and Biochemistry, Center for Computational Sciences, Duquesne University, Pittsburgh, Pennsylvania 15282, United States
| | - Lauren E. Marbella
- Department
of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Patricia Campbell
- Department
of Structural Biology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15260, United States
| | - Jeffry D. Madura
- Department
of Chemistry and Biochemistry, Center for Computational Sciences, Duquesne University, Pittsburgh, Pennsylvania 15282, United States
| | - Sanford A. Asher
- Department
of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
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77
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Buckley K, Ryder AG. Applications of Raman Spectroscopy in Biopharmaceutical Manufacturing: A Short Review. APPLIED SPECTROSCOPY 2017; 71:1085-1116. [PMID: 28534676 DOI: 10.1177/0003702817703270] [Citation(s) in RCA: 76] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
The production of active pharmaceutical ingredients (APIs) is currently undergoing its biggest transformation in a century. The changes are based on the rapid and dramatic introduction of protein- and macromolecule-based drugs (collectively known as biopharmaceuticals) and can be traced back to the huge investment in biomedical science (in particular in genomics and proteomics) that has been ongoing since the 1970s. Biopharmaceuticals (or biologics) are manufactured using biological-expression systems (such as mammalian, bacterial, insect cells, etc.) and have spawned a large (>€35 billion sales annually in Europe) and growing biopharmaceutical industry (BioPharma). The structural and chemical complexity of biologics, combined with the intricacy of cell-based manufacturing, imposes a huge analytical burden to correctly characterize and quantify both processes (upstream) and products (downstream). In small molecule manufacturing, advances in analytical and computational methods have been extensively exploited to generate process analytical technologies (PAT) that are now used for routine process control, leading to more efficient processes and safer medicines. In the analytical domain, biologic manufacturing is considerably behind and there is both a huge scope and need to produce relevant PAT tools with which to better control processes, and better characterize product macromolecules. Raman spectroscopy, a vibrational spectroscopy with a number of useful properties (nondestructive, non-contact, robustness) has significant potential advantages in BioPharma. Key among them are intrinsically high molecular specificity, the ability to measure in water, the requirement for minimal (or no) sample pre-treatment, the flexibility of sampling configurations, and suitability for automation. Here, we review and discuss a representative selection of the more important Raman applications in BioPharma (with particular emphasis on mammalian cell culture). The review shows that the properties of Raman have been successfully exploited to deliver unique and useful analytical solutions, particularly for online process monitoring. However, it also shows that its inherent susceptibility to fluorescence interference and the weakness of the Raman effect mean that it can never be a panacea. In particular, Raman-based methods are intrinsically limited by the chemical complexity and wide analyte-concentration-profiles of cell culture media/bioprocessing broths which limit their use for quantitative analysis. Nevertheless, with appropriate foreknowledge of these limitations and good experimental design, robust analytical methods can be produced. In addition, new technological developments such as time-resolved detectors, advanced lasers, and plasmonics offer potential of new Raman-based methods to resolve existing limitations and/or provide new analytical insights.
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Affiliation(s)
- Kevin Buckley
- Nanoscale Biophotonics Laboratory, School of Chemistry, National University of Ireland - Galway, Galway, Ireland
| | - Alan G Ryder
- Nanoscale Biophotonics Laboratory, School of Chemistry, National University of Ireland - Galway, Galway, Ireland
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78
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Krafft C, Schmitt M, Schie IW, Cialla-May D, Matthäus C, Bocklitz T, Popp J. Markerfreie molekulare Bildgebung biologischer Zellen und Gewebe durch lineare und nichtlineare Raman-spektroskopische Ansätze. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201607604] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Christoph Krafft
- Leibniz-Institut für Photonische Technologien; Albert-Einstein-Straße 9 07745 Jena Deutschland
| | - Michael Schmitt
- Institut für Physikalische Chemie und Abbe Center of Photonics; Friedrich-Schiller-Universität Jena; Helmholtzweg 4 07743 Jena Deutschland
| | - Iwan W. Schie
- Leibniz-Institut für Photonische Technologien; Albert-Einstein-Straße 9 07745 Jena Deutschland
| | - Dana Cialla-May
- Leibniz-Institut für Photonische Technologien; Albert-Einstein-Straße 9 07745 Jena Deutschland
- Institut für Physikalische Chemie und Abbe Center of Photonics; Friedrich-Schiller-Universität Jena; Helmholtzweg 4 07743 Jena Deutschland
| | - Christian Matthäus
- Leibniz-Institut für Photonische Technologien; Albert-Einstein-Straße 9 07745 Jena Deutschland
- Institut für Physikalische Chemie und Abbe Center of Photonics; Friedrich-Schiller-Universität Jena; Helmholtzweg 4 07743 Jena Deutschland
| | - Thomas Bocklitz
- Leibniz-Institut für Photonische Technologien; Albert-Einstein-Straße 9 07745 Jena Deutschland
- Institut für Physikalische Chemie und Abbe Center of Photonics; Friedrich-Schiller-Universität Jena; Helmholtzweg 4 07743 Jena Deutschland
| | - Jürgen Popp
- Leibniz-Institut für Photonische Technologien; Albert-Einstein-Straße 9 07745 Jena Deutschland
- Institut für Physikalische Chemie und Abbe Center of Photonics; Friedrich-Schiller-Universität Jena; Helmholtzweg 4 07743 Jena Deutschland
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79
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Krafft C, Schmitt M, Schie IW, Cialla-May D, Matthäus C, Bocklitz T, Popp J. Label-Free Molecular Imaging of Biological Cells and Tissues by Linear and Nonlinear Raman Spectroscopic Approaches. Angew Chem Int Ed Engl 2017; 56:4392-4430. [PMID: 27862751 DOI: 10.1002/anie.201607604] [Citation(s) in RCA: 134] [Impact Index Per Article: 19.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2016] [Revised: 11/04/2016] [Indexed: 12/20/2022]
Abstract
Raman spectroscopy is an emerging technique in bioanalysis and imaging of biomaterials owing to its unique capability of generating spectroscopic fingerprints. Imaging cells and tissues by Raman microspectroscopy represents a nondestructive and label-free approach. All components of cells or tissues contribute to the Raman signals, giving rise to complex spectral signatures. Resonance Raman scattering and surface-enhanced Raman scattering can be used to enhance the signals and reduce the spectral complexity. Raman-active labels can be introduced to increase specificity and multimodality. In addition, nonlinear coherent Raman scattering methods offer higher sensitivities, which enable the rapid imaging of larger sampling areas. Finally, fiber-based imaging techniques pave the way towards in vivo applications of Raman spectroscopy. This Review summarizes the basic principles behind medical Raman imaging and its progress since 2012.
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Affiliation(s)
- Christoph Krafft
- Leibniz-Institut für Photonische Technologien, Albert-Einstein-Strasse 9, 07745, Jena, Germany
| | - Michael Schmitt
- Institut für Physikalische Chemie und Abbe Center für Photonics, Friedrich Schiller Universität Jena, Helmholtzweg 4, 07743, Jena, Germany
| | - Iwan W Schie
- Leibniz-Institut für Photonische Technologien, Albert-Einstein-Strasse 9, 07745, Jena, Germany
| | - Dana Cialla-May
- Leibniz-Institut für Photonische Technologien, Albert-Einstein-Strasse 9, 07745, Jena, Germany.,Institut für Physikalische Chemie und Abbe Center für Photonics, Friedrich Schiller Universität Jena, Helmholtzweg 4, 07743, Jena, Germany
| | - Christian Matthäus
- Leibniz-Institut für Photonische Technologien, Albert-Einstein-Strasse 9, 07745, Jena, Germany.,Institut für Physikalische Chemie und Abbe Center für Photonics, Friedrich Schiller Universität Jena, Helmholtzweg 4, 07743, Jena, Germany
| | - Thomas Bocklitz
- Leibniz-Institut für Photonische Technologien, Albert-Einstein-Strasse 9, 07745, Jena, Germany.,Institut für Physikalische Chemie und Abbe Center für Photonics, Friedrich Schiller Universität Jena, Helmholtzweg 4, 07743, Jena, Germany
| | - Jürgen Popp
- Leibniz-Institut für Photonische Technologien, Albert-Einstein-Strasse 9, 07745, Jena, Germany.,Institut für Physikalische Chemie und Abbe Center für Photonics, Friedrich Schiller Universität Jena, Helmholtzweg 4, 07743, Jena, Germany
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80
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Zhang G, Li J, Cui P, Wang T, Jiang J, Prezhdo OV. Two-Dimensional Linear Dichroism Spectroscopy for Identifying Protein Orientation and Secondary Structure Composition. J Phys Chem Lett 2017; 8:1031-1037. [PMID: 28198629 DOI: 10.1021/acs.jpclett.7b00311] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Quantitative measurements of protein orientation and secondary structure composition are of great importance for protein biotechnology applications and disease treatments, and yet, they are technically challenging for a spectroscopic study. On the basis of quantum mechanics/molecular mechanics simulations, we demonstrate that two-dimensional (2D) linear dichroism spectroscopy is capable of probing the direction of α-helix motifs in proteins. Compared to the conventional linear dichroism (LD) spectra, 2D spectra double the measurable range of orientation of secondary structures. In addition, by calculating the ratio of transverse ππ* signals to longitudinal ππ* signals in 2D spectra, we can achieve quantitative measurement of the fraction of α-helix content in a protein.
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Affiliation(s)
- Guozhen Zhang
- Hefei National Laboratory for Physical Sciences at the Microscale, Collaborative Innovation Center of Chemistry for Energy Materials, School of Chemistry and Materials Science, University of Science and Technology of China , Hefei, Anhui 230026, People's Republic of China
| | - Jun Li
- Hefei National Laboratory for Physical Sciences at the Microscale, Collaborative Innovation Center of Chemistry for Energy Materials, School of Chemistry and Materials Science, University of Science and Technology of China , Hefei, Anhui 230026, People's Republic of China
| | - Peng Cui
- Hefei National Laboratory for Physical Sciences at the Microscale, Collaborative Innovation Center of Chemistry for Energy Materials, School of Chemistry and Materials Science, University of Science and Technology of China , Hefei, Anhui 230026, People's Republic of China
| | - Tao Wang
- Hefei National Laboratory for Physical Sciences at the Microscale, Collaborative Innovation Center of Chemistry for Energy Materials, School of Chemistry and Materials Science, University of Science and Technology of China , Hefei, Anhui 230026, People's Republic of China
| | - Jun Jiang
- Hefei National Laboratory for Physical Sciences at the Microscale, Collaborative Innovation Center of Chemistry for Energy Materials, School of Chemistry and Materials Science, University of Science and Technology of China , Hefei, Anhui 230026, People's Republic of China
| | - Oleg V Prezhdo
- Department of Chemistry, Department of Physics, and Department of Astronomy, University of Southern California , Los Angeles, California 90089, United States
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81
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Hufziger KT, Bykov SV, Asher SA. Ultraviolet Raman Wide-Field Hyperspectral Imaging Spectrometer for Standoff Trace Explosive Detection. APPLIED SPECTROSCOPY 2017; 71:173-185. [PMID: 27895234 DOI: 10.1177/0003702816680002] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We constructed the first deep ultraviolet (UV) Raman standoff wide-field imaging spectrometer. Our novel deep UV imaging spectrometer utilizes a photonic crystal to select Raman spectral regions for detection. The photonic crystal is composed of highly charged, monodisperse 35.5 ± 2.9 nm silica nanoparticles that self-assemble in solution to produce a face centered cubic crystalline colloidal array that Bragg diffracts a narrow ∼1.0 nm full width at half-maximum (FWHM) UV spectral region. We utilize this photonic crystal to select and image two different spectral regions containing resonance Raman bands of pentaerythritol tetranitrate (PETN) and NH4NO3 (AN). These two deep UV Raman spectral regions diffracted were selected by angle tuning the photonic crystal. We utilized this imaging spectrometer to measure 229 nm excited UV Raman images containing ∼10-1000 µg/cm2 samples of solid PETN and AN on aluminum surfaces at 2.3 m standoff distances. We estimate detection limits of ∼1 µg/cm2 for PETN and AN films under these experimental conditions.
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Affiliation(s)
- Kyle T Hufziger
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA, USA
| | - Sergei V Bykov
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA, USA
| | - Sanford A Asher
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA, USA
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82
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Fujimaki N, Nishiya K, Miura T, Nakabayashi T. Acquisition of pro-oxidant activity of fALS-linked SOD1 mutants as revealed using circular dichroism and UV-resonance Raman spectroscopy. Chem Phys 2016. [DOI: 10.1016/j.chemphys.2016.08.029] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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83
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Yugay D, Goronzy DP, Kawakami LM, Claridge SA, Song TB, Yan Z, Xie YH, Gilles J, Yang Y, Weiss PS. Copper Ion Binding Site in β-Amyloid Peptide. NANO LETTERS 2016; 16:6282-6289. [PMID: 27616333 DOI: 10.1021/acs.nanolett.6b02590] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
β-Amyloid aggregates in the brain play critical roles in Alzheimer's disease, a chronic neurodegenerative condition. Amyloid-associated metal ions, particularly zinc and copper ions, have been implicated in disease pathogenesis. Despite the importance of such ions, the binding sites on the β-amyloid peptide remain poorly understood. In this study, we use scanning tunneling microscopy, circular dichroism, and surface-enhanced Raman spectroscopy to probe the interactions between Cu2+ ions and a key β-amyloid peptide fragment, consisting of the first 16 amino acids, and define the copper-peptide binding site. We observe that in the presence of Cu2+, this peptide fragment forms β-sheets, not seen without the metal ion. By imaging with scanning tunneling microscopy, we are able to identify the binding site, which involves two histidine residues, His13 and His14. We conclude that the binding of copper to these residues creates an interstrand histidine brace, which enables the formation of β-sheets.
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Affiliation(s)
- Diana Yugay
- California NanoSystems Institute, University of California, Los Angeles , Los Angeles, California 90095, United States
- Department of Chemistry and Biochemistry, University of California, Los Angeles , Los Angeles, California 90095, United States
| | - Dominic P Goronzy
- California NanoSystems Institute, University of California, Los Angeles , Los Angeles, California 90095, United States
- Department of Chemistry and Biochemistry, University of California, Los Angeles , Los Angeles, California 90095, United States
| | - Lisa M Kawakami
- Department of Chemistry and Biochemistry, University of California, Los Angeles , Los Angeles, California 90095, United States
| | - Shelley A Claridge
- Department of Chemistry and Biochemistry, University of California, Los Angeles , Los Angeles, California 90095, United States
| | - Tze-Bin Song
- Department of Materials Science and Engineering, University of California, Los Angeles , Los Angeles, California 90095, United States
| | - Zhongbo Yan
- Department of Materials Science and Engineering, University of California, Los Angeles , Los Angeles, California 90095, United States
| | - Ya-Hong Xie
- California NanoSystems Institute, University of California, Los Angeles , Los Angeles, California 90095, United States
- Department of Materials Science and Engineering, University of California, Los Angeles , Los Angeles, California 90095, United States
| | - Jérôme Gilles
- Department of Mathematics and Statistics, San Diego State University , San Diego, California 92182, United States
| | - Yang Yang
- California NanoSystems Institute, University of California, Los Angeles , Los Angeles, California 90095, United States
- Department of Materials Science and Engineering, University of California, Los Angeles , Los Angeles, California 90095, United States
| | - Paul S Weiss
- California NanoSystems Institute, University of California, Los Angeles , Los Angeles, California 90095, United States
- Department of Chemistry and Biochemistry, University of California, Los Angeles , Los Angeles, California 90095, United States
- Department of Materials Science and Engineering, University of California, Los Angeles , Los Angeles, California 90095, United States
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84
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Jannone JM, Grigg JI, Aguirre LM, Jones EM. Electrostatic Interactions at N- and C-Termini Determine Fibril Polymorphism in Serum Amyloid A Fragments. J Phys Chem B 2016; 120:10258-10268. [PMID: 27632709 DOI: 10.1021/acs.jpcb.6b07672] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Amyloid polymorphism presents a challenge to physical theories of amyloid formation and stability. The amyloidogenic protein serum amyloid A (SAA) exhibits complex and unexplained structural polymorphism in its N-terminal fragments: the N-terminal 11-residue peptide (SAA1-11) forms left-handed helical fibrils, while extension by one residue (SAA1-12) produces a rare right-handed amyloid. In this study, we use a combination of vibrational spectroscopy and ultramicroscopy to examine fibrils of these peptides and their terminally acetylated and amidated variants, in an effort to uncover the physical basis for this effect. Raman spectroscopy and atomic force microscopy provide evidence that SAA1-12 forms a β-helical fibril architecture, while SAA1-11 forms more typical stacked β-sheets. Importantly, N-terminal acetylation blocks fibril formation by SAA1-12 with no effect on SAA1-11, while C-terminal amidation has nearly the opposite effect. Together, these data suggest distinct electrostatic interactions at the N- and C-termini stabilize the two fibril structures; we propose model fibril structures in which C-terminal extension changes the favored intermolecular interaction between peptide monomers from an Arg1-C-terminus charge pair to an N-terminus-C-terminus charge pair. This model suggests a general mechanism for charge-mediated amyloid polymorphism and may inform strategies for design of peptide-based nanomaterials stabilized by engineered intermolecular contacts.
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Affiliation(s)
- Justine M Jannone
- Department of Chemistry and Biochemistry, California Polytechnic State University San Luis Obispo, California 93407 United States
| | - James I Grigg
- Department of Chemistry and Biochemistry, California Polytechnic State University San Luis Obispo, California 93407 United States
| | - Lauren M Aguirre
- Department of Chemistry and Biochemistry, California Polytechnic State University San Luis Obispo, California 93407 United States
| | - Eric M Jones
- Department of Chemistry and Biochemistry, California Polytechnic State University San Luis Obispo, California 93407 United States
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85
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Deckert-Gaudig T, Kurouski D, Hedegaard MAB, Singh P, Lednev IK, Deckert V. Spatially resolved spectroscopic differentiation of hydrophilic and hydrophobic domains on individual insulin amyloid fibrils. Sci Rep 2016; 6:33575. [PMID: 27650589 PMCID: PMC5030623 DOI: 10.1038/srep33575] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2016] [Accepted: 08/31/2016] [Indexed: 12/14/2022] Open
Abstract
The formation of insoluble β-sheet-rich protein structures known as amyloid fibrils is associated with numerous neurodegenerative diseases, such as Alzheimer's and Parkinson's disease. A detailed understanding of the molecular structure of the fibril surface is of interest as the first contact with the physiological environment in vivo and plays a decisive role in biological activity and associated toxicity. Recent studies reveal that the inherent sensitivity and specificity of tip-enhanced Raman scattering (TERS) renders this technique a compelling method for fibril surface analysis at the single-particle level. Here, the reproducibility of TERS is demonstrated, indicating its relevance for detecting molecular variations. Consequently, individual fibrils are systematically investigated at nanometer spatial resolution. Spectral parameters were obtained by band-fitting, particularly focusing on the identification of the secondary structure via the amide III band and the differentiation of hydrophobic and hydrophilic domains on the surface. In addition multivariate data analysis, specifically the N-FINDR procedure, was employed to generate structure-specific maps. The ability of TERS to localize specific structural domains on fibril surfaces shows promise to the development of new fibril dissection strategies and can be generally applied to any (bio)chemical surface when structural variations at the nanometer level are of interest.
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Affiliation(s)
- Tanja Deckert-Gaudig
- Leibniz Institute of Photonic Technology (IPHT), Albert-Einstein-Str. 9, 07745 Jena, Germany
| | - Dmitry Kurouski
- Chemistry Department Northwestern University, 2145 Sheridan rd, Evanston, IL 60208, USA
| | - Martin A. B. Hedegaard
- Department of Chemical Engineering, Biotechnology and Environmental Technology, University of Southern Denmark, Campusvej 55, 5230 Odense M, Denmark
| | - Pushkar Singh
- Institute for Physical Chemistry and Abbe School of Photonics, University of Jena, Helmholtzweg 4, 07743 Jena, Germany
| | - Igor K. Lednev
- Department of Chemistry, University at Albany, State University of New York, 1400 Washington Avenue, Albany, New York 12222, United States
| | - Volker Deckert
- Leibniz Institute of Photonic Technology (IPHT), Albert-Einstein-Str. 9, 07745 Jena, Germany
- Institute for Physical Chemistry and Abbe School of Photonics, University of Jena, Helmholtzweg 4, 07743 Jena, Germany
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86
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Sereda V, Ralbovsky NM, Vasudev MC, Naik RR, Lednev IK. Polarized Raman Spectroscopy for Determining the Orientation of di-D-phenylalanine Molecules in a Nanotube. JOURNAL OF RAMAN SPECTROSCOPY : JRS 2016; 47:1056-1062. [PMID: 27795612 PMCID: PMC5079532 DOI: 10.1002/jrs.4884] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Self-assembly of short peptides into nanostructures has become an important strategy for the bottom-up fabrication of nanomaterials. Significant interest to such peptide-based building blocks is due to the opportunity to control the structure and properties of well-structured nanotubes, nanofibrils, and hydrogels. X-ray crystallography and solution NMR, two major tools of structural biology, have significant limitations when applied to peptide nanotubes because of their non-crystalline structure and large weight. Polarized Raman spectroscopy was utilized for structural characterization of well-aligned D-Diphenylalanine nanotubes. The orientation of selected chemical groups relative to the main axis of the nanotube was determined. Specifically, the C-N bond of CNH3+groups is oriented parallel to the nanotube axis, the peptides' carbonyl groups are tilted at approximately 54° from the axis and the COO- groups run perpendicular to the axis. The determined orientation of chemical groups allowed the understanding of the orientation of D-diphenylalanine molecule that is consistent with its equilibrium conformation. The obtained data indicate that there is only one orientation of D-diphenylalanine molecules with respect to the nanotube main axis.
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Affiliation(s)
- Valentin Sereda
- Department of Chemistry, University at Albany, SUNY, 1400 Washington Avenue, Albany, NY 12222, United States
| | - Nicole M. Ralbovsky
- Department of Chemistry, University at Albany, SUNY, 1400 Washington Avenue, Albany, NY 12222, United States
| | - Milana C. Vasudev
- Department of Bioengineering, University of Massachusetts Dartmouth, 285 Old Westport Road, Dartmouth MA 02747, United States
| | - Rajesh R. Naik
- Soft Matter Materials Branch, Materials and Manufacturing Directorate, Wright-Patterson Air Force Base, Dayton, Ohio 45433, United States
| | - Igor K. Lednev
- Department of Chemistry, University at Albany, SUNY, 1400 Washington Avenue, Albany, NY 12222, United States
- Corresponding author: , Phone: (518) 591 8863, Fax: (518) 442-3462
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87
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Ota C, Takano K. Behavior of Bovine Serum Albumin Molecules in Molecular Crowding Environments Investigated by Raman Spectroscopy. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:7372-7382. [PMID: 27352148 DOI: 10.1021/acs.langmuir.6b01228] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The behavior of proteins in crowded environments is dominated by protein-crowder interactions (the entropic/excluded volume effect) and protein-protein interactions (the soft chemical effect). The details of these interactions, however, are not fully understood. In this study, the behavior of bovine serum albumin (BSA) in crowded environments, including high protein concentrations and in the presence of another protein, was investigated by Raman spectroscopy. A detailed analysis of the water, Tyr, and Phe Raman bands revealed that the excluded volume effect with an increase in the protein concentration changed the local environment of hydrophobic residues. In contrast, no specific changes to the secondary structure were observed from the analysis of the concentration dependence of the amide I band. BSA was experimentally shown to adopt a more compact state in the presence of the crowding agent. Moreover, H-D exchange experiments of the amide I band revealed that the intramolecular hydrogen bonds of BSA were strengthened in the presence of the protein crowder. Thus, the Raman spectroscopy results have revealed the molecular behavior of proteins in crowded environments by extracting information about the excluded volume effect, soft chemical interactions, and the hydration effect.
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Affiliation(s)
- Chikashi Ota
- Advanced R&D Center, Horiba, Ltd. , 2 Miyanohigashi, Kisshoin, Minami-ku, Kyoto 601-8510, Japan
| | - Kazufumi Takano
- Department of Biomolecular Chemistry, Kyoto Prefectural University , Sakyo-ku, Kyoto 606-8522, Japan
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88
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Paul TJ, Hoffmann Z, Wang C, Shanmugasundaram M, DeJoannis J, Shekhtman A, Lednev IK, Yadavalli VK, Prabhakar R. Structural and Mechanical Properties of Amyloid Beta Fibrils: A Combined Experimental and Theoretical Approach. J Phys Chem Lett 2016; 7:2758-64. [PMID: 27387853 PMCID: PMC5956519 DOI: 10.1021/acs.jpclett.6b01066] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
In this combined experimental (deep ultraviolet resonance Raman (DUVRR) spectroscopy and atomic force microscopy (AFM)) and theoretical (molecular dynamics (MD) simulations and stress-strain (SS)) study, the structural and mechanical properties of amyloid beta (Aβ40) fibrils have been investigated. The DUVRR spectroscopy and AFM experiments confirmed the formation of linear, unbranched and β-sheet rich fibrils. The fibrils (Aβ40)n, formed using n monomers, were equilibrated using all-atom MD simulations. The structural properties such as β-sheet character, twist, interstrand distance, and periodicity of these fibrils were found to be in agreement with experimental measurements. Furthermore, Young's modulus (Y) = 4.2 GPa computed using SS calculations was supported by measured values of 1.79 ± 0.41 and 3.2 ± 0.8 GPa provided by two separate AFM experiments. These results revealed size dependence of structural and material properties of amyloid fibrils and show the utility of such combined experimental and theoretical studies in the design of precisely engineered biomaterials.
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Affiliation(s)
- Thomas J. Paul
- Department of Chemistry, University of Miami, Coral Gables, Florida 33146, United States
| | - Zachary Hoffmann
- Department of Chemistry, University of Miami, Coral Gables, Florida 33146, United States
| | - Congzhou Wang
- Department of Chemical and Life Science Engineering, Virginia Commonwealth University, Richmond, Virginia 23284, United States
| | - Maruda Shanmugasundaram
- Department of Chemistry, University at Albany, State University of New York, Albany, New York 12222, United States
| | - Jason DeJoannis
- Dassault Systèmes BIOVIA, San Deigo, California 92121, United States
| | - Alexander Shekhtman
- Department of Chemistry, University at Albany, State University of New York, Albany, New York 12222, United States
| | - Igor K. Lednev
- Department of Chemistry, University at Albany, State University of New York, Albany, New York 12222, United States
| | - Vamsi K. Yadavalli
- Department of Chemical and Life Science Engineering, Virginia Commonwealth University, Richmond, Virginia 23284, United States
| | - Rajeev Prabhakar
- Department of Chemistry, University of Miami, Coral Gables, Florida 33146, United States
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89
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Ota C, Noguchi S, Tsumoto K. The molecular interaction of a protein in highly concentrated solution investigated by Raman spectroscopy. Biopolymers 2016; 103:237-46. [PMID: 25418947 DOI: 10.1002/bip.22593] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2014] [Revised: 11/15/2014] [Accepted: 11/18/2014] [Indexed: 11/09/2022]
Abstract
We used Raman spectroscopy to investigate the structure and interactions of lysozyme molecules in solution over a wide range of concentrations (2.5-300 mg ml(-1)). No changes in the amide-I band were observed as the concentration was increased, but the width of the Trp band at 1555 cm(-1) and the ratios of the intensities of the Tyr bands at 856 and 837 cm(-1), the Trp bands at 870 and 877 cm(-1), and the bands at 2940 (CH stretching) and 3420 cm(-1) (OH stretching) changed as the concentration was changed. These results reveal that although the distance between lysozyme molecules changed by more than an order of magnitude over the tested concentration range, the secondary structure of the protein did not change. The changes in the molecular interactions occurred in a stepwise process as the order of magnitude of the distance between molecules changed. These results suggest that Raman bands can be used as markers to investigate the behavior of high-concentration solutions of proteins and that the use of Raman spectroscopy will lead to progress in our understanding not only of the basic science of protein behavior under concentrated (i.e., crowded) conditions but also of practical processes involving proteins, such as in the field of biopharmaceuticals.
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Affiliation(s)
- Chikashi Ota
- Department of Scientific & Semiconductor Instruments R&D, Application Development Center, Horiba Ltd., Minami-ku, Kyoto 601-8510, Japan
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90
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Punihaole D, Workman RJ, Hong Z, Madura JD, Asher SA. Polyglutamine Fibrils: New Insights into Antiparallel β-Sheet Conformational Preference and Side Chain Structure. J Phys Chem B 2016; 120:3012-26. [PMID: 26947327 DOI: 10.1021/acs.jpcb.5b11380] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Understanding the structure of polyglutamine (polyQ) amyloid-like fibril aggregates is crucial to gaining insights into the etiology of at least ten neurodegenerative disorders, including Huntington's disease. Here, we determine the structure of D2Q10K2 (Q10) fibrils using ultraviolet resonance Raman (UVRR) spectroscopy and molecular dynamics (MD). Using UVRR, we determine the fibril peptide backbone Ψ and glutamine (Gln) side chain χ3 dihedral angles. We find that most of the fibril peptide bonds adopt antiparallel β-sheet conformations; however, a small population of peptide bonds exist in parallel β-sheet structures. Using MD, we simulate three different potential fibril structural models that consist of either β-strands or β-hairpins. Comparing the experimentally measured Ψ and χ3 angle distributions to those obtained from the MD simulated models, we conclude that the basic structural motif of Q10 fibrils is an extended β-strand structure. Importantly, we determine from our MD simulations that Q10 fibril antiparallel β-sheets are thermodynamically more stable than parallel β-sheets. This accounts for why polyQ fibrils preferentially adopt antiparallel β-sheet conformations instead of in-register parallel β-sheets like most amyloidogenic peptides. In addition, we directly determine, for the first time, the structures of Gln side chains. Our structural data give new insights into the role that the Gln side chains play in the stabilization of polyQ fibrils. Finally, our work demonstrates the synergistic power and utility of combining UVRR measurements and MD modeling to determine the structure of amyloid-like fibrils.
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Affiliation(s)
- David Punihaole
- Department of Chemistry, University of Pittsburgh , Pittsburgh, Pennsylvania 15260, United States
| | - Riley J Workman
- Department of Chemistry and Biochemistry, Center for Computational Sciences, Duquesne University , Pittsburgh, Pennsylvania 15282, United States
| | - Zhenmin Hong
- Department of Chemistry, University of Pittsburgh , Pittsburgh, Pennsylvania 15260, United States
| | - Jeffry D Madura
- Department of Chemistry and Biochemistry, Center for Computational Sciences, Duquesne University , Pittsburgh, Pennsylvania 15282, United States
| | - Sanford A Asher
- Department of Chemistry, University of Pittsburgh , Pittsburgh, Pennsylvania 15260, United States
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91
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Tang CQ, Lin K, Zhou XG, Liu SL. In situ Detection of Amide A Bands of Proteins in Water by Raman Ratio Spectrum. CHINESE J CHEM PHYS 2016. [DOI: 10.1063/1674-0068/29/cjcp1511240] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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92
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A computational approach to the resonance Raman spectrum of doxorubicin in aqueous solution. Theor Chem Acc 2016. [DOI: 10.1007/s00214-015-1781-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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93
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Kurouski D, Van Duyne RP, Lednev IK. Exploring the structure and formation mechanism of amyloid fibrils by Raman spectroscopy: a review. Analyst 2016; 140:4967-80. [PMID: 26042229 DOI: 10.1039/c5an00342c] [Citation(s) in RCA: 176] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Amyloid fibrils are β-sheet rich protein aggregates that are strongly associated with various neurodegenerative diseases. Raman spectroscopy has been broadly utilized to investigate protein aggregation and amyloid fibril formation and has been shown to be capable of revealing changes in secondary and tertiary structures at all stages of fibrillation. When coupled with atomic force (AFM) and scanning electron (SEM) microscopies, Raman spectroscopy becomes a powerful spectroscopic approach that can investigate the structural organization of amyloid fibril polymorphs. In this review, we discuss the applications of Raman spectroscopy, a unique, label-free and non-destructive technique for the structural characterization of amyloidogenic proteins, prefibrilar oligomers, and mature fibrils.
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Affiliation(s)
- Dmitry Kurouski
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois, USA.
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94
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Kumar S, Verma T, Mukherjee R, Ariese F, Somasundaram K, Umapathy S. Raman and infra-red microspectroscopy: towards quantitative evaluation for clinical research by ratiometric analysis. Chem Soc Rev 2016; 45:1879-900. [DOI: 10.1039/c5cs00540j] [Citation(s) in RCA: 81] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
We demonstrate how ratioing spectral bands can circumvent experimental artefacts, and present a library of ratios from the biomedical literature.
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Affiliation(s)
- Srividya Kumar
- Department of Inorganic and Physical Chemistry
- Indian Institute of Science
- Bengaluru 560 012
- India
| | - Taru Verma
- Centre for Biosystems Science and Engineering
- Indian Institute of Science
- Bangalore-560012
- India
| | - Ria Mukherjee
- Department of Inorganic and Physical Chemistry
- Indian Institute of Science
- Bengaluru 560 012
- India
| | - Freek Ariese
- Department of Inorganic and Physical Chemistry
- Indian Institute of Science
- Bengaluru 560 012
- India
| | - Kumaravel Somasundaram
- Department of Microbiology and Cell Biology
- Indian Institute of Science
- Bangalore 560 012
- India
| | - Siva Umapathy
- Department of Inorganic and Physical Chemistry
- Indian Institute of Science
- Bengaluru 560 012
- India
- Department of Instrumentation and Applied Physics
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95
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Paul A, Sharma B, Mondal T, Thalluri K, Paul S, Mandal B. Amyloid β derived switch-peptides as a tool for investigation of early events of aggregation: a combined experimental and theoretical approach. MEDCHEMCOMM 2016. [DOI: 10.1039/c5md00466g] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
π → π stacking interaction takes place prior to aggregation as the early event of amyloid aggregation of amyloidogenic peptides.
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Affiliation(s)
- Ashim Paul
- Department of Chemistry
- Indian Institute of Technology
- Guwahati
- India
| | - Bhanita Sharma
- Department of Chemistry
- Indian Institute of Technology
- Guwahati
- India
| | - Tanmay Mondal
- Department of Chemistry
- Indian Institute of Technology
- Guwahati
- India
| | - Kishore Thalluri
- Department of Chemistry
- Indian Institute of Technology
- Guwahati
- India
| | - Sandip Paul
- Department of Chemistry
- Indian Institute of Technology
- Guwahati
- India
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96
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Abstract
Deep UV resonance Raman spectroscopy is a powerful technique for probing the structure and formation mechanism of protein fibrils, which are traditionally difficult to study with other techniques owing to their low solubility and noncrystalline arrangement. Utilizing a tunable deep UV Raman system allows for selective enhancement of different chromophores in protein fibrils, which provides detailed information on different aspects of the fibrils' structure and formation. Additional information can be extracted with the use of advanced data treatment such as chemometrics and 2D correlation spectroscopy. In this chapter we give an overview of several techniques for utilizing deep UV resonance Raman spectroscopy to study the structure and mechanism of formation of protein fibrils. Clever use of hydrogen-deuterium exchange can elucidate the structure of the fibril core. Selective enhancement of aromatic amino acid side chains provides information about the local environment and protein tertiary structure. The mechanism of protein fibril formation can be investigated with kinetic experiments and advanced chemometrics.
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Affiliation(s)
- Joseph D Handen
- Department of Chemistry, University at Albany, SUNY, 1400 Washington Avenue, Albany, NY, 12222, USA
| | - Igor K Lednev
- Department of Chemistry, University at Albany, SUNY, 1400 Washington Avenue, Albany, NY, 12222, USA.
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97
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Ota C, Noguchi S, Nagatoishi S, Tsumoto K. Assessment of the Protein-Protein Interactions in a Highly Concentrated Antibody Solution by Using Raman Spectroscopy. Pharm Res 2015; 33:956-69. [PMID: 26677115 DOI: 10.1007/s11095-015-1842-8] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2015] [Accepted: 12/07/2015] [Indexed: 12/15/2022]
Abstract
PURPOSE To investigate the protein-protein interactions of a highly concentrated antibody solution that could cause oligomerization or aggregation and to develop a better understanding of the optimization of drug formulations. METHODS In this study, we used Raman spectroscopy to investigate the structure and interactions of a highly concentrated antibody solution over a wide range of concentrations (10-200 mg/mL) with the aid of a multivariate analysis. RESULTS Our analysis of the amide I band, I 856 /I 830 of Tyr, and the relative intensity at 1004 cm(-1) of the Phe and OH stretching region at around 3000 cm(-1) showed that across this wide range of concentrations, the secondary structure of the IgG molecules did not change; however, short-range attractive interactions around the Tyr and Phe residues occurred as the distance between the IgG molecules decreased with increasing concentration. Analysis of the OH stretching region at around 3000 cm(-1) showed that these short-range attractive interactions correlated with the amount of hydrated water around the IgG molecules. CONCLUSIONS Our data show that Raman spectroscopy can provide valuable information of the protein-protein interactions based on conformational approaches to support conventional colloidal approaches, especially for analyses of highly concentrated solutions.
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Affiliation(s)
- Chikashi Ota
- Advanced R&D Center, Horiba, Ltd., 2 Miyanohigashi, Kisshoin, Minami-ku, Kyoto, 601-8510, Japan.
| | - Shintaro Noguchi
- Advanced R&D Center, Horiba, Ltd., 2 Miyanohigashi, Kisshoin, Minami-ku, Kyoto, 601-8510, Japan
| | - Satoru Nagatoishi
- Department of Bioengineering, School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo, Japan
| | - Kouhei Tsumoto
- Department of Bioengineering, School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo, Japan.,Laboratory of Medical Proteomics, Institute of Medical Science, The University of Tokyo, Minato-ku, Tokyo, Japan.,Drug Discovery Initiative, The University of Tokyo, Bunkyo-ku, Tokyo, Japan
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98
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Punihaole D, Hong Z, Jakubek RS, Dahlburg EM, Geib S, Asher SA. Glutamine and Asparagine Side Chain Hyperconjugation-Induced Structurally Sensitive Vibrations. J Phys Chem B 2015; 119:13039-51. [PMID: 26392216 PMCID: PMC5065012 DOI: 10.1021/acs.jpcb.5b07651] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We identified vibrational spectral marker bands that sensitively report on the side chain structures of glutamine (Gln) and asparagine (Asn). Density functional theory (DFT) calculations indicate that the Amide III(P) (AmIII(P)) vibrations of Gln and Asn depend cosinusoidally on their side chain OCCC dihedral angles (the χ3 and χ2 angles of Gln and Asn, respectively). We use UV resonance Raman (UVRR) and visible Raman spectroscopy to experimentally correlate the AmIII(P) Raman band frequency to the primary amide OCCC dihedral angle. The AmIII(P) structural sensitivity derives from the Gln (Asn) Cβ-Cγ (Cα-Cβ) stretching component of the vibration. The Cβ-Cγ (Cα-Cβ) bond length inversely correlates with the AmIII(P) band frequency. As the Cβ-Cγ (Cα-Cβ) bond length decreases, its stretching force constant increases, which results in an upshift in the AmIII(P) frequency. The Cβ-Cγ (Cα-Cβ) bond length dependence on the χ3 (χ2) dihedral angle results from hyperconjugation between the Cδ═Oϵ (Cγ═Oδ) π* and Cβ-Cγ (Cα-Cβ) σ orbitals. Using a Protein Data Bank library, we show that the χ3 and χ2 dihedral angles of Gln and Asn depend on the peptide backbone Ramachandran angles. We demonstrate that the inhomogeneously broadened AmIII(P) band line shapes can be used to calculate the χ3 and χ2 angle distributions of peptides. The spectral correlations determined in this study enable important new insights into protein structure in solution, and in Gln- and Asn-rich amyloid-like fibrils and prions.
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Affiliation(s)
- David Punihaole
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Chevron Science Center, Pittsburgh, Pennsylvania 15260, United States
| | - Zhenmin Hong
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Chevron Science Center, Pittsburgh, Pennsylvania 15260, United States
| | - Ryan S. Jakubek
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Chevron Science Center, Pittsburgh, Pennsylvania 15260, United States
| | - Elizabeth M. Dahlburg
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Chevron Science Center, Pittsburgh, Pennsylvania 15260, United States
| | - Steven Geib
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Chevron Science Center, Pittsburgh, Pennsylvania 15260, United States
| | - Sanford A. Asher
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Chevron Science Center, Pittsburgh, Pennsylvania 15260, United States
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99
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Bhowmik D, Mote KR, MacLaughlin CM, Biswas N, Chandra B, Basu JK, Walker GC, Madhu PK, Maiti S. Cell-Membrane-Mimicking Lipid-Coated Nanoparticles Confer Raman Enhancement to Membrane Proteins and Reveal Membrane-Attached Amyloid-β Conformation. ACS NANO 2015; 9:9070-7. [PMID: 26391443 DOI: 10.1021/acsnano.5b03175] [Citation(s) in RCA: 69] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Identifying the structures of membrane bound proteins is critical to understanding their function in healthy and diseased states. We introduce a surface enhanced Raman spectroscopy technique which can determine the conformation of membrane-bound proteins, at low micromolar concentrations, and also in the presence of a substantial membrane-free fraction. Unlike conventional surface enhanced Raman spectroscopy, our approach does not require immobilization of molecules, as it uses spontaneous binding of proteins to lipid bilayer-encapsulated Ag nanoparticles. We apply this technique to probe membrane-attached oligomers of Amyloid-β40 (Aβ40), whose conformation is keenly sought in the context of Alzheimer's disease. Isotope-shifts in the Raman spectra help us obtain secondary structure information at the level of individual residues. Our results show the presence of a β-turn, flanked by two β-sheet regions. We use solid-state NMR data to confirm the presence of the β-sheets in these regions. In the membrane-attached oligomer, we find a strongly contrasting and near-orthogonal orientation of the backbone H-bonds compared to what is found in the mature, less-toxic Aβ fibrils. Significantly, this allows a "porin" like β-barrel structure, providing a structural basis for proposed mechanisms of Aβ oligomer toxicity.
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Affiliation(s)
- Debanjan Bhowmik
- Department of Chemical Sciences, Tata Institute of Fundamental Research , Homi Bhabha Road, Colaba, Mumbai 400005, India
| | - Kaustubh R Mote
- TIFR Centre for Interdisciplinary Sciences , 21 Brundavan Colony, Narsinghi, Hyderabad 500075, India
| | - Christina M MacLaughlin
- Department of Chemistry, Lash Miller Laboratories, University of Toronto , Toronto, ON M5S 3H6, Canada
| | - Nupur Biswas
- Department of Physics, Indian Institute of Science , Bengaluru 560012, India
| | - Bappaditya Chandra
- Department of Chemical Sciences, Tata Institute of Fundamental Research , Homi Bhabha Road, Colaba, Mumbai 400005, India
| | - Jaydeep K Basu
- Department of Physics, Indian Institute of Science , Bengaluru 560012, India
| | - Gilbert C Walker
- Department of Chemistry, Lash Miller Laboratories, University of Toronto , Toronto, ON M5S 3H6, Canada
| | - Perunthiruthy K Madhu
- Department of Chemical Sciences, Tata Institute of Fundamental Research , Homi Bhabha Road, Colaba, Mumbai 400005, India
- TIFR Centre for Interdisciplinary Sciences , 21 Brundavan Colony, Narsinghi, Hyderabad 500075, India
| | - Sudipta Maiti
- Department of Chemical Sciences, Tata Institute of Fundamental Research , Homi Bhabha Road, Colaba, Mumbai 400005, India
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100
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Wang Z, Li Y. Resonance Raman enhancement optimization in the visible range by selecting different excitation wavelengths. JOURNAL OF BIOMEDICAL OPTICS 2015; 20:095003. [PMID: 26334974 DOI: 10.1117/1.jbo.20.9.095003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2015] [Accepted: 08/05/2015] [Indexed: 06/05/2023]
Abstract
Resonance enhancement of Raman spectroscopy (RS) has been used to significantly improve the sensitivity and selectivity of detection for specific components in complicated environments. Resonance RS gives more insight into the biochemical structure and reactivity. In this field, selecting a proper excitation wavelength to achieve optimal resonance enhancement is vital for the study of an individual chemical/biological ingredient with a particular absorption characteristic. Raman spectra of three azo derivatives with absorption spectra in the visible range are studied under the same experimental conditions at 488, 532, and 633 nm excitations. Universal laws in the visible range have been concluded by analyzing resonance Raman (RR) spectra of samples. The long wavelength edge of the absorption spectrum is a better choice for intense enhancement and the integrity of a Raman signal. The obtained results are valuable for applying RR for the selective detection of biochemical constituents whose electronic transitions take place at energies corresponding to the visible spectra, which is much friendlier to biologial samples compared to ultraviolet.
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