1
|
de Barros HR, da Silva RTP, Fernandes R, Toro-Mendoza J, Coluzza I, Temperini MLA, Cordoba de Torresi SI. Unraveling the Nano-Bio Interface Interactions of a Lipase Adsorbed on Gold Nanoparticles under Laser Excitation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:5663-5672. [PMID: 38451216 DOI: 10.1021/acs.langmuir.3c02994] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/08/2024]
Abstract
The complex nature and structure of biomolecules and nanoparticles and their interactions make it challenging to achieve a deeper understanding of the dynamics at the nano-bio interface of enzymes and plasmonic nanoparticles subjected to light excitation. In this study, circular dichroism (CD) and Raman spectroscopic experiments and molecular dynamics (MD) simulations were used to investigate the potential changes at the nano-bio interface upon plasmonic excitation. Our data showed that photothermal and thermal heating induced distinct changes in the secondary structure of a model nanobioconjugate composed of lipase fromCandida antarcticafraction B (CALB) and gold nanoparticles (AuNPs). The use of a green laser led to a substantial decrease in the α-helix content of the lipase from 66% to 13% and an increase in the β-sheet content from 5% to 31% compared to the initial conformation of the nanobioconjugate. In contrast, the differences under similar thermal heating conditions were only 55% and 11%, respectively. This study revealed important differences related to the enzyme secondary structure, enzyme-nanoparticle interactions, and the stability of the enzyme catalytic triad (Ser105-Asp187-His224), influenced by the instantaneous local temperature increase generated from photothermal heating compared to the slower rate of thermal heating of the bulk. These results provide valuable insights into the interactions between biomolecules and plasmonic nanoparticles induced by photothermal heating, advancing plasmonic biocatalysis and related fields.
Collapse
Affiliation(s)
- Heloise Ribeiro de Barros
- Department of Fundamental Chemistry, Institute of Chemistry, University of São Paulo, Av. Prof. Lineu Prestes, 748, São Paulo, 05508-000 São Paulo, Brasil
- CIC biomaGUNE and CIBER-BBN, Paseo de Miramón 182, Donostia-San Sebastián 2014, Spain
| | - Rafael Trivella Pacheco da Silva
- Department of Fundamental Chemistry, Institute of Chemistry, University of São Paulo, Av. Prof. Lineu Prestes, 748, São Paulo, 05508-000 São Paulo, Brasil
| | - Rafaella Fernandes
- Department of Fundamental Chemistry, Institute of Chemistry, University of São Paulo, Av. Prof. Lineu Prestes, 748, São Paulo, 05508-000 São Paulo, Brasil
| | - Jhoan Toro-Mendoza
- CIC biomaGUNE and CIBER-BBN, Paseo de Miramón 182, Donostia-San Sebastián 2014, Spain
- Centro de Biomedicina Molecular, Instituto Venezolano de Investigaciones Científicas, Carretera Panamericana, Km 11, Altos de Pipe, Caracas 1020, Venezuela
| | - Ivan Coluzza
- Center for Theoretical Biological Physics, Rice University, Houston, Texas 77005, United States
| | - Marcia L A Temperini
- Department of Fundamental Chemistry, Institute of Chemistry, University of São Paulo, Av. Prof. Lineu Prestes, 748, São Paulo, 05508-000 São Paulo, Brasil
| | - Susana I Cordoba de Torresi
- Department of Fundamental Chemistry, Institute of Chemistry, University of São Paulo, Av. Prof. Lineu Prestes, 748, São Paulo, 05508-000 São Paulo, Brasil
| |
Collapse
|
2
|
Dhillon AK, Sharma A, Yadav V, Singh R, Ahuja T, Barman S, Siddhanta S. Raman spectroscopy and its plasmon-enhanced counterparts: A toolbox to probe protein dynamics and aggregation. WILEY INTERDISCIPLINARY REVIEWS. NANOMEDICINE AND NANOBIOTECHNOLOGY 2024; 16:e1917. [PMID: 37518952 DOI: 10.1002/wnan.1917] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Revised: 06/22/2023] [Accepted: 07/06/2023] [Indexed: 08/01/2023]
Abstract
Protein unfolding and aggregation are often correlated with numerous diseases such as Alzheimer's, Parkinson's, Huntington's, and other debilitating neurological disorders. Such adverse events consist of a plethora of competing mechanisms, particularly interactions that control the stability and cooperativity of the process. However, it remains challenging to probe the molecular mechanism of protein dynamics such as aggregation, and monitor them in real-time under physiological conditions. Recently, Raman spectroscopy and its plasmon-enhanced counterparts, such as surface-enhanced Raman spectroscopy (SERS) and tip-enhanced Raman spectroscopy (TERS), have emerged as sensitive analytical tools that have the potential to perform molecular studies of functional groups and are showing significant promise in probing events related to protein aggregation. We summarize the fundamental working principles of Raman, SERS, and TERS as nondestructive, easy-to-perform, and fast tools for probing protein dynamics and aggregation. Finally, we highlight the utility of these techniques for the analysis of vibrational spectra of aggregation of proteins from various sources such as tissues, pathogens, food, biopharmaceuticals, and lastly, biological fouling to retrieve precise chemical information, which can be potentially translated to practical applications and point-of-care (PoC) devices. This article is categorized under: Therapeutic Approaches and Drug Discovery > Emerging Technologies Diagnostic Tools > Diagnostic Nanodevices Nanotechnology Approaches to Biology > Nanoscale Systems in Biology.
Collapse
Affiliation(s)
| | - Arti Sharma
- Department of Chemistry, Indian Institute of Technology Delhi, New Delhi, India
| | - Vikas Yadav
- Department of Chemistry, Indian Institute of Technology Delhi, New Delhi, India
| | - Ruchi Singh
- Department of Chemistry, Indian Institute of Technology Delhi, New Delhi, India
| | - Tripti Ahuja
- Department of Chemistry, Indian Institute of Technology Delhi, New Delhi, India
| | - Sanmitra Barman
- Center for Advanced Materials and Devices (CAMD), BML Munjal University, Haryana, India
| | - Soumik Siddhanta
- Department of Chemistry, Indian Institute of Technology Delhi, New Delhi, India
| |
Collapse
|
3
|
Meraj L, Mehmood N, Majeed MI, Nawaz H, Rashid N, Fatima R, Habiba UE, Tahseen H, Naz M, Asghar M, Ghafoor N, Ahmad H. Characterization of structural changes occurring in insulin at different time intervals at room temperature by surface-enhanced Raman spectroscopy. Photodiagnosis Photodyn Ther 2023; 44:103796. [PMID: 37699467 DOI: 10.1016/j.pdpdt.2023.103796] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2023] [Revised: 08/23/2023] [Accepted: 09/07/2023] [Indexed: 09/14/2023]
Abstract
BACKGROUND Insulin storage above the temperature recommended by food and drug administration (FDA) causes decrease in its functional efficacy due to degradation and aggregation of its protein based active pharmaceutical ingredient (API) that results poor glycemic control in diabetic patients. The aggregation of protein causes serious neurodegenerative diseases such as type-2 diabetes, Huntington disease, Parkinson's disease, and Alzheimer's disease. Surface-enhanced Raman spectroscopy (SERS) has been employed for the denaturation study of many proteins at the temperature above the recommendations of food and drug administration (FDA) (above 30 °C) which indicates potential of technique for such studies. OBJECTIVE SERS along with multivariate discriminating analysis techniques-based analysis of degradation of liquid pharmaceutical insulin protein after regular intervals of time at room temperature to analyze the structural changes in this protein during the storage of insulin pharmaceutical at room temperature. METHODS Silver nanoparticles (Ag-NPs) prepared by chemical reduction method are used as SERS active substrate for the surface enhancement of the insulin spectral signal. SERS spectral measurements of insulin were collected from eight different samples of insulin in the time range of 7 pm to 7 am first at fridge temperature (5 °C), second after half hour and next six with the time difference of 2 h each time at room temperature. The acquired SERS spectral data was preprocessed and analyzed. SERS structural transformations detection and discrimination potential in insulin was further confirmed by applying multivariate discriminating analysis techniques including principal component analysis (PCA) and Partial least square regression analysis (PLSR). RESULTS SERS significantly detects the structural changes produced in insulin even after 2 h of insulin placement at room temperature. PCA successfully differentiates the insulin spectral data obtained after regular intervals of time according to PC-1 (77 %) explained variance. Application of PLSR model provides quantitative confirmation of SERS efficiency, by providing insulin data regression coefficients plot, efficient prediction of time with calibration data set having 0.77 mean square absolute error of calibration (RMSAEC), validation data set with 0.80 mean square absolute error of prediction (RMSAEP) and 0.98 coefficient of determination (R2) for both calibration and validation data set. CONCLUSION SERS is proved as a highly sensitive and discriminating technique to detect and discriminate insulin structural changes after regular intervals of time at room temperature.
Collapse
Affiliation(s)
- Lubna Meraj
- Department of Chemistry, University of Agriculture Faisalabad, Faisalabad 38000, Pakistan
| | - Nasir Mehmood
- Department of Chemistry, University of Agriculture Faisalabad, Faisalabad 38000, Pakistan
| | - Muhammad Irfan Majeed
- Department of Chemistry, University of Agriculture Faisalabad, Faisalabad 38000, Pakistan.
| | - Haq Nawaz
- Department of Chemistry, University of Agriculture Faisalabad, Faisalabad 38000, Pakistan.
| | - Nosheen Rashid
- Department of Chemistry, University of Education, Faisalabad Campus, Faisalabad 38000, Pakistan
| | - Rida Fatima
- Department of Chemistry, University of Agriculture Faisalabad, Faisalabad 38000, Pakistan
| | - Umm E Habiba
- Department of Chemistry, University of Agriculture Faisalabad, Faisalabad 38000, Pakistan
| | - Hira Tahseen
- Department of Chemistry, University of Agriculture Faisalabad, Faisalabad 38000, Pakistan
| | - Maira Naz
- Department of Chemistry, University of Agriculture Faisalabad, Faisalabad 38000, Pakistan
| | - Maria Asghar
- Department of Chemistry, University of Agriculture Faisalabad, Faisalabad 38000, Pakistan
| | - Nida Ghafoor
- Department of Chemistry, University of Agriculture Faisalabad, Faisalabad 38000, Pakistan
| | - Hafsa Ahmad
- Department of Chemistry, University of Agriculture Faisalabad, Faisalabad 38000, Pakistan
| |
Collapse
|
4
|
Avni A, Joshi A, Mukhopadhyay S. Hydrogen-Deuterium Exchange Vibrational Raman Spectroscopy Distinguishes Distinct Amyloid Polymorphs Comprising Altered Core Architecture. J Phys Chem Lett 2023:5592-5601. [PMID: 37307286 DOI: 10.1021/acs.jpclett.3c01086] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Amyloid fibrils are ordered protein aggregates comprising a hydrogen-bonded central cross-β core displaying a structural diversity in their supramolecular packing arrangements within the core. Such an altered packing results in amyloid polymorphism that gives rise to morphological and biological strain diversities. Here, we show that vibrational Raman spectroscopy coupled with hydrogen/deuterium (H/D) exchange discerns the key structural features that are responsible for yielding diverse amyloid polymorphs. Such a noninvasive and label-free methodology allows us to structurally distinguish distinct amyloid polymorphs displaying altered hydrogen bonding and supramolecular packing within the cross-β structural motif. By using quantitative molecular fingerprinting and multivariate statistical analysis, we analyze key Raman bands for the protein backbone and side chains that allow us to capture the conformational heterogeneity and structural distributions within distinct amyloid polymorphs. Our results delineate the key molecular factors governing the structural diversity in amyloid polymorphs and can potentially simplify studying amyloid remodeling by small molecules.
Collapse
|
5
|
Choi S, Chun SY, Kwak K, Cho M. Micro-Raman spectroscopic analysis of liquid-liquid phase separation. Phys Chem Chem Phys 2023; 25:9051-9060. [PMID: 36843414 DOI: 10.1039/d2cp05115j] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
Abstract
Liquid-liquid phase separation (LLPS) plays a significant role in various biological processes, including the formation of membraneless organelles and pathological protein aggregation. Although many studies have found various factors that modulate the LLPS process or the liquid-to-solid phase transition (LSPT) using microscopy or fluorescence-based methods, the molecular mechanistic details underlying LLPS and protein aggregation within liquid droplets remain uncharacterized. Therefore, structural information on proteins inside liquid droplets is required to understand the mechanistic link to amyloid formation. In the present study, we monitored droplet formation related to protein fibrillation using micro-Raman spectroscopy in combination with differential interference contrast (DIC) microscopy to study the conformational change in proteins and the hydrogen-bonding (H-bonding) structure of water during LLPS. Interestingly, we found that the O-D stretching band for water (HOD in H2O) inside the droplets exhibited a distinct Raman spectrum from that of the bulk water, suggesting that the time-dependent change in the hydration environment in the protein droplets during the process of LLPS can be studied. These results demonstrate that the superior spatial resolution of micro-Raman spectroscopy offers significant advantages in investigating the molecular mechanisms of LLPS and following LSPT processes.
Collapse
Affiliation(s)
- Suin Choi
- Center for Molecular Spectroscopy and Dynamics, Institute for Basic Science (IBS), Seoul 02841, Republic of Korea.,Department of Chemistry, Korea University, Seoul 02841, Republic of Korea.
| | - So Yeon Chun
- Center for Molecular Spectroscopy and Dynamics, Institute for Basic Science (IBS), Seoul 02841, Republic of Korea.,Department of Chemistry, Korea University, Seoul 02841, Republic of Korea.
| | - Kyungwon Kwak
- Center for Molecular Spectroscopy and Dynamics, Institute for Basic Science (IBS), Seoul 02841, Republic of Korea.,Department of Chemistry, Korea University, Seoul 02841, Republic of Korea.
| | - Minhaeng Cho
- Center for Molecular Spectroscopy and Dynamics, Institute for Basic Science (IBS), Seoul 02841, Republic of Korea.,Department of Chemistry, Korea University, Seoul 02841, Republic of Korea.
| |
Collapse
|
6
|
Bernhard C, van Zadel MJ, Bunn A, Bonn M, Gonella G. In Situ Label-Free Study of Protein Adsorption on Nanoparticles. J Phys Chem B 2021; 125:9019-9026. [PMID: 34323495 PMCID: PMC8389981 DOI: 10.1021/acs.jpcb.1c04775] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Revised: 07/11/2021] [Indexed: 12/02/2022]
Abstract
Improving the design of nanoparticles for use as drug carriers or biosensors requires a better understanding of the protein-nanoparticle interaction. Here, we present a new tool to investigate this interaction in situ and without additional labeling of the proteins and/or nanoparticles. By combining nonresonant second-harmonic light scattering with a modified Langmuir model, we show that it is possible to gain insight into the adsorption behavior of blood proteins, namely fibrinogen, human serum albumin, and transferrin, onto negatively charged polystyrene nanoparticles. The modified Langmuir model gives us access to the maximum amount of adsorbed protein, the apparent binding constant, and Gibbs free energy. Furthermore, we employ the method to investigate the influence of the nanoparticle size on the adsorption of human serum albumin and find that the amount of adsorbed protein increases more than the surface area per nanoparticle for larger diameters.
Collapse
Affiliation(s)
- Christoph Bernhard
- Max Planck Institute for
Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Marc-Jan van Zadel
- Max Planck Institute for
Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Alexander Bunn
- Max Planck Institute for
Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Mischa Bonn
- Max Planck Institute for
Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | | |
Collapse
|
7
|
Darussalam EY, Peterfi O, Deckert-Gaudig T, Roussille L, Deckert V. pH-dependent disintegration of insulin amyloid fibrils monitored with atomic force microscopy and surface-enhanced Raman spectroscopy. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2021; 256:119672. [PMID: 33852991 DOI: 10.1016/j.saa.2021.119672] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Revised: 02/14/2021] [Accepted: 03/01/2021] [Indexed: 05/11/2023]
Abstract
Aggregation of insulin into amyloid fibrils is characterized by the conversion of the native secondary structure of the peptide into an enriched ß-sheet conformation. In vitro, the growth or disintegration of amyloid fibrils can be influenced by various external factors such as pH, temperature etc. While current studies mainly focus on the influence of environmental conditions on the growth process of insulin fibrils, the present study investigates the effect of pH changes on the morphology and secondary structure of mature fibrils. In the experiments, insulin is fibrillated at pH 2.5 and the grown mature fibrils are suspended in pH 4-7 solutions. The obtained structures are analyzed by atomic force microscopy (AFM) and surface-enhanced Raman spectroscopy (SERS). Initially grown mature fibrils from pH 2.5 solutions show a long and intertwined morphology. Increasing the solution pH initiates the gradual disintegration of the filamentous morphology into unordered aggregates. These observations are supported by SERS experiments, where the spectra of the mature fibrils show mainly a β-pleated sheet conformation, while the amide I band region of the amorphous aggregates indicate exclusively α-helix/unordered structures. The results demonstrate that no complex reagent is required for the disintegration of insulin fibrils. Simply regulating the pH of the environment induces local changes in the protonation state within the peptide chains. This effectively disrupts the well-ordered β-sheet structure network based on hydrogen bonds.
Collapse
Affiliation(s)
- Erwan Y Darussalam
- Leibniz Institute of Photonic Technology (IPHT), Albert-Einstein-Str. 9, 07745 Jena, Germany
| | - Orsolya Peterfi
- Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich-Schiller-University Jena, Helmholtzweg 4, 07743 Jena, Germany
| | - Tanja Deckert-Gaudig
- Leibniz Institute of Photonic Technology (IPHT), Albert-Einstein-Str. 9, 07745 Jena, Germany; Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich-Schiller-University Jena, Helmholtzweg 4, 07743 Jena, Germany
| | - Ludovic Roussille
- Leibniz Institute of Photonic Technology (IPHT), Albert-Einstein-Str. 9, 07745 Jena, Germany
| | - Volker Deckert
- Leibniz Institute of Photonic Technology (IPHT), Albert-Einstein-Str. 9, 07745 Jena, Germany; Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich-Schiller-University Jena, Helmholtzweg 4, 07743 Jena, Germany; Institute of Quantum Science and Engineering, Texas A&M University, College Station, TX 77843-4242, USA.
| |
Collapse
|
8
|
Awada C, Abdullah MMBA, Traboulsi H, Dab C, Alshoaibi A. SARS-CoV-2 Receptor Binding Domain as a Stable-Potential Target for SARS-CoV-2 Detection by Surface-Enhanced Raman Spectroscopy. SENSORS (BASEL, SWITZERLAND) 2021; 21:4617. [PMID: 34283162 PMCID: PMC8271591 DOI: 10.3390/s21134617] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/18/2021] [Revised: 07/02/2021] [Accepted: 07/02/2021] [Indexed: 12/23/2022]
Abstract
In this work, we report a new approach for detecting SARS-CoV-2 RBD protein (RBD) using the surface-enhanced Raman spectroscopy (SERS) technique. The optical enhancement was obtained thanks to the preparation of nanostructured Ag/Au substrates. Fabricated Au/Ag nanostructures were used in the SERS experiment for RBD protein detection. SERS substrates show higher capabilities and sensitivity to detect RBD protein in a short time (3 s) and with very low power. We were able to push the detection limit of proteins to a single protein detection level of 1 pM. The latter is equivalent to 1 fM as a detection limit of viruses. Additionally, we have shown that the SERS technique was useful to figure out the presence of RBD protein on antibody functionalized substrates. In this case, the SERS detection was based on protein-antibody recognition, which led to shifts in the Raman peaks and allowed signal discrimination between RBD and other targets such as Bovine serum albumin (BSA) protein. A perfect agreement between a 3D simulated model based on finite element method and experiment was reported confirming the SERS frequency shift potential for trace proteins detection. Our results could open the way to develop a new prototype based on SERS sensitivity and selectivity for rapid detection at a very low concentration of virus and even at a single protein level.
Collapse
Affiliation(s)
- Chawki Awada
- Department of Physics, College of Science, King Faisal University, P.O. Box 400, Al-Ahsa 31982, Saudi Arabia;
| | - Mohammed Mahfoudh BA Abdullah
- Department of Biological Sciences, College of Science, King Faisal University, P.O. Box 400, Al-Ahsa 31982, Saudi Arabia;
| | - Hassan Traboulsi
- Department of Chemistry, College of Science, King Faisal University, P.O. Box 400, Al-Ahsa 31982, Saudi Arabia;
| | - Chahinez Dab
- Département de Chimie, Université de Montréal, Campus de MIL, Montréal, QC H2V 0B3, Canada;
| | - Adil Alshoaibi
- Department of Physics, College of Science, King Faisal University, P.O. Box 400, Al-Ahsa 31982, Saudi Arabia;
| |
Collapse
|
9
|
Biophysical characterization of p53 core domain aggregates. Biochem J 2020; 477:111-120. [PMID: 31841126 DOI: 10.1042/bcj20190778] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2019] [Revised: 12/12/2019] [Accepted: 12/13/2019] [Indexed: 12/16/2022]
Abstract
Aggregation is the cause of numerous protein conformation diseases. A common facet of these maladies is the transition of a protein from its functional native state into higher order forms, such as oligomers and amyloid fibrils. p53 is an essential tumor suppressor that is prone to such conformational transitions, resulting in its compromised ability to avert cancer. This work explores the biophysical properties of early-, mid-, and late-stage p53 core domain (p53C) aggregates. Atomistic and coarse-grained molecular dynamics (MD) simulations suggest that early- and mid-stage p53C aggregates have a polymorphic topology of antiparallel and parallel β-sheets that localize to the core amyloidogenic sequence. Both topologies involve similar extents of interstrand mainchain hydrogen bonding, while sidechain interactions could play a role in regulating strand orientation. The free energy difference between the antiparallel and parallel states was within statistical uncertainty. Negative stain electron microscopy of mature fibrils shows a wide distribution of fiber widths, indicating that polymorphism may extend to the quaternary structure level. Circular dichroism of the fibrils was indicative of β-sheet rich structures in atypical conformations. The Raman spectrum of aggregated p53C was consistent with a mixture of arranged β-sheets and heterogeneous structural elements, which is compatible with the MD findings of an ordered β-sheet nucleus flanked by disordered structure. Structural polymorphism is a common property of amyloids; however, because certain polymorphs of the same protein can be more harmful than others, going forward it will be pertinent to establish correlations between p53C aggregate structure and pathology.
Collapse
|
10
|
Heo C, Ha T, You C, Huynh T, Lim H, Kim J, Kesama MR, Lee J, Kim TT, Lee YH. Identifying Fibrillization State of Aβ Protein via Near-Field THz Conductance Measurement. ACS NANO 2020; 14:6548-6558. [PMID: 32167289 DOI: 10.1021/acsnano.9b08572] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Progressive Alzheimer's disease is correlated with the oligomerization and fibrillization of the amyloid beta (Aβ) protein. We identify the fibrillization stage of the Aβ protein through label-free near-field THz conductance measurements in a buffer solution. Frequency-dependent conductance was obtained by measuring the differential transmittance of the time-domain spectroscopy in the THz range with a molar concentration of monomer, oligomer, and fibrillar forms of the Aβ protein. Conductance at the lower frequency limit was observed to be high in monomers, reduced in oligomers, and dropped to an insulating state in fibrils and increased proportionally with the Aβ protein concentration. The monotonic decrease in the conductance at low frequency was dominated by a simple Drude component in the monomer with concentration and nonlinear conductance behaviors in the oligomer and fibril. By extracting the structural localization parameter, a dimensionless constant, with the modified Drude-Smith model, we defined a dementia quotient (DQ) value (0 < De < 1) as a discrete metric for a various Aβ proteins at a low concentration of 0.1 μmol/L; DQ = 1.0 ± 0.002 (fibril by full localization, mainly by Smith component), DQ = 0.64 ± 0.013 (oligomer by intermixed localization), and DQ = 0.0 ± 0.000 (monomer by Drude component). DQ values were discretely preserved independent of the molar concentration or buffer variation. This provides plenty of room for the label-free diagnosis of Alzheimer's disease using the near-field THz conductance measurement.
Collapse
Affiliation(s)
- Chaejeong Heo
- Center for Integrated Nanostructure Physics (CINAP), Institute for Basic Science (IBS), Suwon 16419, Republic of Korea
- Institute for Quantum Biophysics (IQB), Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Taewoo Ha
- Center for Integrated Nanostructure Physics (CINAP), Institute for Basic Science (IBS), Suwon 16419, Republic of Korea
| | - Chunjae You
- Institute for Quantum Biophysics (IQB), Sungkyunkwan University, Suwon 16419, Republic of Korea
- Department of Biophysics, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Thuy Huynh
- Institute for Quantum Biophysics (IQB), Sungkyunkwan University, Suwon 16419, Republic of Korea
- Department of Biophysics, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Hosub Lim
- Department of Mechanical Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Jiwon Kim
- Department of Integrative Biotechnology, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Mallikarjuna Reddy Kesama
- Center for Integrated Nanostructure Physics (CINAP), Institute for Basic Science (IBS), Suwon 16419, Republic of Korea
- Institute for Quantum Biophysics (IQB), Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Jinkee Lee
- Institute for Quantum Biophysics (IQB), Sungkyunkwan University, Suwon 16419, Republic of Korea
- Department of Mechanical Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Teun-Teun Kim
- Center for Integrated Nanostructure Physics (CINAP), Institute for Basic Science (IBS), Suwon 16419, Republic of Korea
| | - Young Hee Lee
- Center for Integrated Nanostructure Physics (CINAP), Institute for Basic Science (IBS), Suwon 16419, Republic of Korea
- Department of Energy Science and Department of Physics, Sungkyunkwan University, Suwon 16419, Republic of Korea
| |
Collapse
|
11
|
Exploration of Insulin Amyloid Polymorphism Using Raman Spectroscopy and Imaging. Biophys J 2020; 118:2997-3007. [PMID: 32428440 DOI: 10.1016/j.bpj.2020.04.031] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2020] [Revised: 04/10/2020] [Accepted: 04/27/2020] [Indexed: 11/20/2022] Open
Abstract
We aimed to investigate insulin amyloid fibril polymorphism caused by salt effects and heating temperature and to visualize the structural differences of the polymorphisms in situ using Raman imaging without labeling. The time course monitoring for amyloid formation was carried out in an acidic condition without any salts and with two species of salts (NaCl and Na2SO4) by heating at 60, 70, 80, and 90°C. The intensity ratio of two Raman bands at 1672 and 1657 cm-1 due to antiparallel β-sheet and α-helix structures, respectively, was revealed to be an indicator of amyloid fibril formation, and the relative proportion of the β-sheet structure was higher in the case with salts, especially at a higher temperature with Na2SO4. In conjunction with the secondary structural changes of proteins, the S-S stretching vibrational mode of a disulfide bond (∼514 cm-1) and the ratio of the tyrosine doublet I850/I826 were also found to be markers distinguishing polymorphisms of insulin amyloid fibrils by principal component analysis. Especially, amyloid fibrils with Na2SO4 media formed the gauche-gauche-gauche conformation of disulfide bond at a higher rate, but without any salts, the gauche-gauche-gauche conformation was partially transformed into the gauche-gauche-trans conformation at higher temperatures. The different environments of the hydroxyl groups of the tyrosine residue were assumed to be caused by fibril polymorphism. Raman imaging using these marker bands also successfully visualized the two- and three- dimensional structural differences of amyloid polymorphisms. These results demonstrate the potential of Raman imaging as a diagnostic tool for polymorphisms in tissues of amyloid-related diseases.
Collapse
|
12
|
Sukhanova A, Poly S, Bozrova S, Lambert É, Ewald M, Karaulov A, Molinari M, Nabiev I. Nanoparticles With a Specific Size and Surface Charge Promote Disruption of the Secondary Structure and Amyloid-Like Fibrillation of Human Insulin Under Physiological Conditions. Front Chem 2019; 7:480. [PMID: 31417892 PMCID: PMC6683663 DOI: 10.3389/fchem.2019.00480] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2018] [Accepted: 06/24/2019] [Indexed: 01/08/2023] Open
Abstract
Nanoparticles attract much interest as fluorescent labels for diagnostic and therapeutic tools, although their applications are often hindered by size- and shape-dependent cytotoxicity. This cytotoxicity is related not only to the leak of toxic metals from nanoparticles into a biological solution, but also to molecular cytotoxicity effects determined by the formation of a protein corona, appearance of an altered protein conformation leading to exposure of cryptic epitopes and cooperative effects involved in the interaction of proteins and peptides with nanoparticles. In the last case, nanoparticles may serve, depending on their nature, as centers of self-association or fibrillation of proteins and peptides, provoking amyloid-like proteinopathies, or as inhibitors of self-association of proteins, or they can self-assemble on biopolymers as on templates. In this study, human insulin protein was used to analyze nanoparticle-induced proteinopathy in physiological conditions. It is known that human insulin may form amyloid fibers, but only under extreme experimental conditions (very low pH and high temperatures). Here, we have shown that the quantum dots (QDs) may induce amyloid-like fibrillation of human insulin under physiological conditions through a complex process strongly dependent on the size and surface charge of QDs. The insulin molecular structure and fibril morphology have been shown to be modified at different stages of its fibrillation, which has been proved by comparative analysis of the data obtained using circular dichroism, dynamic light scattering, amyloid-specific thioflavin T (ThT) assay, transmission electron microscopy, and high-speed atomic force microscopy. We have found important roles of the QD size and surface charge in the destabilization of the insulin structure and the subsequent fibrillation. Remodeling of the insulin secondary structure accompanied by remarkable increase in the rate of formation of amyloid-like fibrils under physiologically normal conditions was observed when the protein was incubated with QDs of exact specific diameter coated with slightly negative specific polyethylene glycol (PEG) derivatives. Strongly negatively or slightly positively charged PEG-modified QDs of the same specific diameter or QDs of bigger or smaller diameters had no effect on insulin fibrillation. The observed effects pave the way to the control of amyloidosis proteinopathy by varying the nanoparticle size and surface charge.
Collapse
Affiliation(s)
- Alyona Sukhanova
- Laboratoire de Recherche en Nanosciences, LRN-EA4682, UFR de Pharmacie, Université de Reims Champagne-Ardenne, Reims, France.,Laboratory of Nano-Bioengineering, Moscow Engineering Physics Institute, National Research Nuclear University MEPhI, Moscow, Russia
| | - Simon Poly
- Department of Membrane Biophysics, Interfaculty Institute of Biochemistry, University of Tübingen, Tübingen, Germany
| | - Svetlana Bozrova
- Laboratory of Nano-Bioengineering, Moscow Engineering Physics Institute, National Research Nuclear University MEPhI, Moscow, Russia
| | - Éléonore Lambert
- Laboratoire de Recherche en Nanosciences, LRN-EA4682, UFR de Pharmacie, Université de Reims Champagne-Ardenne, Reims, France
| | - Maxime Ewald
- Laboratoire de Recherche en Nanosciences, LRN-EA4682, UFR de Pharmacie, Université de Reims Champagne-Ardenne, Reims, France
| | - Alexander Karaulov
- Department of Clinical Immunology and Allergology, Sechenov First Moscow State Medical University, Moscow, Russia
| | - Michael Molinari
- Laboratoire de Recherche en Nanosciences, LRN-EA4682, UFR de Pharmacie, Université de Reims Champagne-Ardenne, Reims, France
| | - Igor Nabiev
- Laboratoire de Recherche en Nanosciences, LRN-EA4682, UFR de Pharmacie, Université de Reims Champagne-Ardenne, Reims, France.,Laboratory of Nano-Bioengineering, Moscow Engineering Physics Institute, National Research Nuclear University MEPhI, Moscow, Russia
| |
Collapse
|
13
|
Ji M, Arbel M, Zhang L, Freudiger CW, Hou SS, Lin D, Yang X, Bacskai BJ, Xie XS. Label-free imaging of amyloid plaques in Alzheimer's disease with stimulated Raman scattering microscopy. SCIENCE ADVANCES 2018; 4:eaat7715. [PMID: 30456301 PMCID: PMC6239428 DOI: 10.1126/sciadv.aat7715] [Citation(s) in RCA: 105] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/03/2018] [Accepted: 10/19/2018] [Indexed: 05/18/2023]
Abstract
One of the key pathological features of Alzheimer's disease (AD) is the existence of extracellular deposition of amyloid plaques formed with misfolded amyloid-β (Aβ). The conformational change of proteins leads to enriched contents of β sheets, resulting in remarkable changes of vibrational spectra, especially the spectral shifts of the amide I mode. Here, we applied stimulated Raman scattering (SRS) microscopy to image amyloid plaques in the brain tissue of an AD mouse model. We have demonstrated the capability of SRS microscopy as a rapid, label-free imaging modality to differentiate misfolded from normal proteins based on the blue shift (~10 cm-1) of amide I SRS spectra. Furthermore, SRS imaging of Aβ plaques was verified by antibody staining of frozen thin sections and fluorescence imaging of fresh tissues. Our method may provide a new approach for studies of AD pathology, as well as other neurodegenerative diseases associated with protein misfolding.
Collapse
Affiliation(s)
- Minbiao Ji
- State Key Laboratory of Surface Physics and Department of Physics, Multiscale Research Institute of Complex Systems, Human Phenome Institute, Key Laboratory of Micro and Nano Photonics Structures (Ministry of Education), Fudan University, Shanghai 200433, China
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138, USA
- Corresponding author. (X.S.X.); (B.J.B.); (M.J.)
| | - Michal Arbel
- Alzheimer’s Disease Research Laboratory, Department of Neurology, MassGeneral Institute for Neurodegenerative Disease, Massachusetts General Hospital, Harvard Medical School, Charlestown, MA 02129, USA
| | - Lili Zhang
- State Key Laboratory of Surface Physics and Department of Physics, Multiscale Research Institute of Complex Systems, Human Phenome Institute, Key Laboratory of Micro and Nano Photonics Structures (Ministry of Education), Fudan University, Shanghai 200433, China
| | | | - Steven S. Hou
- Alzheimer’s Disease Research Laboratory, Department of Neurology, MassGeneral Institute for Neurodegenerative Disease, Massachusetts General Hospital, Harvard Medical School, Charlestown, MA 02129, USA
| | - Dongdong Lin
- State Key Laboratory of Surface Physics and Department of Physics, Multiscale Research Institute of Complex Systems, Human Phenome Institute, Key Laboratory of Micro and Nano Photonics Structures (Ministry of Education), Fudan University, Shanghai 200433, China
| | - Xinju Yang
- State Key Laboratory of Surface Physics and Department of Physics, Multiscale Research Institute of Complex Systems, Human Phenome Institute, Key Laboratory of Micro and Nano Photonics Structures (Ministry of Education), Fudan University, Shanghai 200433, China
| | - Brian J. Bacskai
- Alzheimer’s Disease Research Laboratory, Department of Neurology, MassGeneral Institute for Neurodegenerative Disease, Massachusetts General Hospital, Harvard Medical School, Charlestown, MA 02129, USA
- Corresponding author. (X.S.X.); (B.J.B.); (M.J.)
| | - X. Sunney Xie
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138, USA
- Corresponding author. (X.S.X.); (B.J.B.); (M.J.)
| |
Collapse
|
14
|
Zhang W, Yu X, Li Y, Su Z, Jandt KD, Wei G. Protein-mimetic peptide nanofibers: Motif design, self-assembly synthesis, and sequence-specific biomedical applications. Prog Polym Sci 2018. [DOI: 10.1016/j.progpolymsci.2017.12.001] [Citation(s) in RCA: 114] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
|
15
|
Karaballi RA, Merchant S, Power SR, Brosseau CL. Electrochemical surface-enhanced Raman spectroscopy (EC-SERS) study of the interaction between protein aggregates and biomimetic membranes. Phys Chem Chem Phys 2018; 20:4513-4526. [DOI: 10.1039/c7cp06838g] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
EC-SERS is used for the first time to characterize protein aggregate–biomembrane interactions.
Collapse
Affiliation(s)
| | | | - Sasha R. Power
- Department of Chemistry
- Saint Mary's University
- Halifax
- Canada
| | | |
Collapse
|
16
|
Polarized super-resolution structural imaging inside amyloid fibrils using Thioflavine T. Sci Rep 2017; 7:12482. [PMID: 28970520 PMCID: PMC5624930 DOI: 10.1038/s41598-017-12864-9] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2017] [Accepted: 09/14/2017] [Indexed: 11/08/2022] Open
Abstract
Thioflavin T (ThT) is standardly used as a fluorescent marker to detect aggregation of amyloid fibrils by conventional fluorescence microscopy, including polarization resolved imaging that brings information on the orientational order of the fibrils. These techniques are however diffraction limited and cannot provide fine structural details at the fibrils scales of 10-100 nm, which lie beyond the diffraction limit. In this work, we evaluate the capacity of ThT to photoswitch when bound to insulin amyloids by adjusting the redox properties of its environment. We demonstrate that on-off duty cycles, intensity and photostability of the ThT fluorescence emission under adequate buffer conditions permit stochastic super-resolution imaging with a localization precision close to 20 nm. We show moreover that signal to noise conditions allow polarized orientational imaging of single ThT molecules, which reveals ultra-structure signatures related to protofilaments twisting within amyloid fibrils.
Collapse
|
17
|
Tracking the amyloidogenic core of IAPP amyloid fibrils: Insights from micro-Raman spectroscopy. J Struct Biol 2017; 199:140-152. [PMID: 28602716 DOI: 10.1016/j.jsb.2017.06.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2017] [Revised: 05/19/2017] [Accepted: 06/03/2017] [Indexed: 12/14/2022]
Abstract
Human islet amyloid polypeptide (hIAPP) is the major protein component of extracellular amyloid deposits, located in the islets of Langerhans, a hallmark of type II diabetes. The underlying mechanisms of IAPP aggregation have not yet been clearly defined, although the highly amyloidogenic sequence of the protein has been extensively studied. Several segments have been highlighted as aggregation-prone regions (APRs), with much attention focused on the central 8-17 and 20-29 stretches. In this work, we employ micro-Raman spectroscopy to identify specific regions that are contributing to or are excluded from the amyloidogenic core of IAPP amyloid fibrils. Our results demonstrate that both the N-terminal region containing a conserved disulfide bond between Cys residues at positions 2 and 7, and the C-terminal region containing the only Tyr residue are excluded from the amyloid core. Finally, by performing detailed aggregation assays and molecular dynamics simulations on a number of IAPP variants, we demonstrate that point mutations within the central APRs contribute to the reduction of the overall amyloidogenic potential of the protein but do not completely abolish the formation of IAPP amyloid fibrils.
Collapse
|
18
|
Lin D, Wu Z, Li S, Zhao W, Ma C, Wang J, Jiang Z, Zhong Z, Zheng Y, Yang X. Large-Area Au-Nanoparticle-Functionalized Si Nanorod Arrays for Spatially Uniform Surface-Enhanced Raman Spectroscopy. ACS NANO 2017; 11:1478-1487. [PMID: 28061026 DOI: 10.1021/acsnano.6b06778] [Citation(s) in RCA: 117] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
In this study, large-area hexagonal-packed Si nanorod (SiNR) arrays in conjunction with Au nanoparticles (AuNPs) were fabricated for surface-enhanced Raman spectroscopy (SERS). We have achieved ultrasensitive molecular detection with high reproducibility and spatial uniformity. A finite-difference time-domain simulation suggests that a wide range of three-dimensional electric fields are generated along the surfaces of the SiNR array. With the tuning of the gap and diameter of the SiNRs, the produced long decay length (>130 nm) of the enhanced electric field makes the SERS substrate a zero-gap system for ultrasensitive detection of large biomolecules. In the detection of R6G molecules, our SERS system achieved an enhancement factor of >107 with a relative standard deviation as small as 3.9-7.2% over 30 points across the substrate. More significantly, the SERS substrate yielded ultrasensitive Raman signals on long amyloid-β fibrils at the single-fibril level, which provides promising potentials for ultrasensitive detection of amyloid aggregates that are related to Alzheimer's disease. Our study demonstrates that the SiNRs functionalized with AuNPs may serve as excellent SERS substrates in chemical and biomedical detection.
Collapse
Affiliation(s)
- Dongdong Lin
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University , Shanghai 200433, China
| | - Zilong Wu
- Department of Mechanical Engineering, Materials Science and Engineering Program, and Texas Materials Institute, The University of Texas at Austin , Austin, Texas 78712, United States
| | - Shujie Li
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University , Shanghai 200433, China
| | - Wenqi Zhao
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University , Shanghai 200433, China
| | - Chongjun Ma
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University , Shanghai 200433, China
| | - Jie Wang
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University , Shanghai 200433, China
| | - Zuimin Jiang
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University , Shanghai 200433, China
- Collaborative Innovation Center of Advanced Microstructures , Nanjing 210093, China
| | - Zhenyang Zhong
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University , Shanghai 200433, China
- Collaborative Innovation Center of Advanced Microstructures , Nanjing 210093, China
| | - Yuebing Zheng
- Department of Mechanical Engineering, Materials Science and Engineering Program, and Texas Materials Institute, The University of Texas at Austin , Austin, Texas 78712, United States
| | - Xinju Yang
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University , Shanghai 200433, China
- Collaborative Innovation Center of Advanced Microstructures , Nanjing 210093, China
| |
Collapse
|
19
|
Cannon D, Eichhorn S, Donald AM. Structure of Spherulites in Insulin, β-Lactoglobulin, and Amyloid β. ACS OMEGA 2016; 1:915-922. [PMID: 31457172 PMCID: PMC6640738 DOI: 10.1021/acsomega.6b00208] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2016] [Accepted: 10/27/2016] [Indexed: 05/12/2023]
Abstract
Under denaturing conditions such as low pH and elevated temperatures, proteins in vitro can misfold and aggregate to form long rigid rods called amyloid fibrils; further self-assembly can lead to larger structures termed spherulites. Both of these aggregates resemble amyloid tangles and plaques associated with Alzheimer's disease in vivo. The ability to form such aggregates in a multitude of different proteins suggests that it is a generic ability in their mechanism to form. Little is known about the structure of these large spherulites ranging from 5 to 100 microns and whether they can reproducibly form in amyloid β (1-40) (Aβ40), a 40-amino acid residue peptide, which is one of the major components of Alzheimer's amyloid deposits. Here, we show that spherulites can readily form in Aβ40 under certain monomerization and denaturing conditions. Using polarized and nonpolarized Raman spectroscopy, we analyzed the secondary structure of spherulites formed from three different proteins: insulin, β-lactoglobulin (BLG), and Aβ40. Visually, these spherulites have a characteristic "Maltese Cross" structure under crossed polarizers through an optical microscope. However, our results indicate that insulin and Aβ40 spherulites have similar core structures consisting mostly of random coils with radiating fibrils, whereas BLG mostly contains β-sheets and fibrils that are likely to be spiraling from the core to the edge.
Collapse
Affiliation(s)
- Danielle Cannon
- Cavendish
Laboratory, University of Cambridge, JJ Thomson Avenue, CB3 0HE Cambridge, U.K.
| | - Stephen
J. Eichhorn
- School
of Materials, University of Manchester, Sackville Street, M13 9PL Manchester, U.K.
| | - Athene M. Donald
- Cavendish
Laboratory, University of Cambridge, JJ Thomson Avenue, CB3 0HE Cambridge, U.K.
| |
Collapse
|
20
|
Characterization of Sizes of Aggregates of Insulin Analogs and the Conformations of the Constituent Protein Molecules: A Concomitant Dynamic Light Scattering and Raman Spectroscopy Study. J Pharm Sci 2016; 105:551-558. [DOI: 10.1016/j.xphs.2015.10.023] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2015] [Revised: 10/16/2015] [Accepted: 10/21/2015] [Indexed: 12/11/2022]
|
21
|
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: 198] [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.
Collapse
Affiliation(s)
- Dmitry Kurouski
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois, USA.
| | | | | |
Collapse
|
22
|
Sereda V, Sawaya MR, Lednev IK. Structural Organization of Insulin Fibrils Based on Polarized Raman Spectroscopy: Evaluation of Existing Models. J Am Chem Soc 2015; 137:11312-20. [DOI: 10.1021/jacs.5b07535] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Valentin Sereda
- Department
of Chemistry, University at Albany, SUNY, 1400 Washington Avenue, Albany, New York 12222, United States
| | - Michael R. Sawaya
- UCLA−DOE Institute, 611 Charles
E. Young Drive, Los Angeles, California 90095-1570, United States
| | - Igor K. Lednev
- Department
of Chemistry, University at Albany, SUNY, 1400 Washington Avenue, Albany, New York 12222, United States
| |
Collapse
|
23
|
Profit AA, Vedad J, Saleh M, Desamero RZB. Aromaticity and amyloid formation: effect of π-electron distribution and aryl substituent geometry on the self-assembly of peptides derived from hIAPP(22-29). Arch Biochem Biophys 2015; 567:46-58. [PMID: 25524740 PMCID: PMC5490837 DOI: 10.1016/j.abb.2014.12.008] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2014] [Revised: 11/26/2014] [Accepted: 12/07/2014] [Indexed: 10/24/2022]
Abstract
A comprehensive investigation of peptides derived from the 22-29 region of human islet amyloid polypeptide (hIAPP) that contain phenylalanine analogs at position 23 with a variety of electron donating and withdrawing groups, along with heteroaromatic surrogates, has been employed to interrogate how π-electron distribution effects amyloid formation. Kinetic aggregation studies using turbidity measurements indicate that electron rich aromatic ring systems consistently abolish the amyloidogenic propensity of hIAPP(22-29). Electron poor systems modulate the rate of aggregation. Raman and Fourier transform infrared spectroscopy confirm the parallel β-sheet secondary structure of aggregates derived from peptides containing electron poor phenylalanine analogs and provide direct evidence of ring stacking. Transmission electron microscopy confirms the presence of amyloid fibrils. The effect of aryl substituent geometry on peptide self-assembly reveals that the electronic nature of substituents and not their steric profile is responsible for failure of the electron donating group peptides to aggregate. Non-aggregating hIAPP(22-29) peptides were found to inhibit the self-assembly of full-length hIAPP(1-37). The most potent inhibitory peptides contain phenylalanine with the p-amino and p-formamido functionalities. These novel peptides may serve as leads for the development of future aggregation inhibitors. A potential mechanism for inhibition of amylin self-assembly by electron rich (-29) peptides is proposed.
Collapse
Affiliation(s)
- Adam A Profit
- York College, Institute for Macromolecular Assemblies and the Graduate Center of the City University of New York, Jamaica, NY 11451, United States.
| | - Jayson Vedad
- York College, Institute for Macromolecular Assemblies and the Graduate Center of the City University of New York, Jamaica, NY 11451, United States
| | - Mohamad Saleh
- York College, Institute for Macromolecular Assemblies and the Graduate Center of the City University of New York, Jamaica, NY 11451, United States
| | - Ruel Z B Desamero
- York College, Institute for Macromolecular Assemblies and the Graduate Center of the City University of New York, Jamaica, NY 11451, United States.
| |
Collapse
|
24
|
Surface characterization of insulin protofilaments and fibril polymorphs using tip-enhanced Raman spectroscopy (TERS). Biophys J 2014; 106:263-71. [PMID: 24411258 DOI: 10.1016/j.bpj.2013.10.040] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2013] [Revised: 10/19/2013] [Accepted: 10/28/2013] [Indexed: 11/22/2022] Open
Abstract
Amyloid fibrils are β-sheet-rich protein aggregates that are strongly associated with a variety of neurodegenerative maladies, such as Alzheimer's and Parkinson's diseases. Even if the secondary structure of such fibrils is well characterized, a thorough understanding of their surface organization still remains elusive. Tip-enhanced Raman spectroscopy (TERS) is one of a few techniques that allow the direct characterization of the amino acid composition and the protein secondary structure of the amyloid fibril surface. Herein, we investigated the surfaces of two insulin fibril polymorphs with flat (flat) and left-twisted (twisted) morphology. It was found that the two differ substantially in both amino acid composition and protein secondary structure. For example, the amounts of Tyr, Pro, and His differ, as does the number of carboxyl groups on the respective surfaces, whereas the amounts of Phe and of positively charged amino and imino groups remain similar. In addition, the surface of protofilaments, the precursors of the mature flat and twisted fibrils, was investigated using TERS. The results show substantial differences with respect to the mature fibrils. A correlation of amino acid frequencies and protein secondary structures on the surface of protofilaments and on flat and twisted fibrils allowed us to propose a hypothetical mechanism for the propagation to specific fibril polymorphs. This knowledge can shed a light on the toxicity of amyloids and define the key factors responsible for fibril polymorphism. Finally, this work demonstrates the potential of TERS for the surface characterization of amyloid fibril polymorphs.
Collapse
|
25
|
Tah B, Pal P, Roy S, Dutta D, Mishra S, Ghosh M, Talapatra GB. Quantum-mechanical DFT calculation supported Raman spectroscopic study of some amino acids in bovine insulin. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 129:345-351. [PMID: 24747859 DOI: 10.1016/j.saa.2014.03.044] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2013] [Revised: 03/12/2014] [Accepted: 03/20/2014] [Indexed: 06/03/2023]
Abstract
In this article Quantum mechanical (QM) calculations by Density Functional Theory (DFT) have been performed of all amino acids present in bovine insulin. Simulated Raman spectra of those amino acids are compared with their experimental spectra and the major bands are assigned. The results are in good agreement with experiment. We have also verified the DFT results with Quantum mechanical molecular mechanics (QM/MM) results for some amino acids. QM/MM results are very similar with the DFT results. Although the theoretical calculation of individual amino acids are feasible, but the calculated Raman spectrum of whole protein molecule is difficult or even quite impossible task, since it relies on lengthy and costly quantum-chemical computation. However, we have tried to simulate the Raman spectrum of whole protein by adding the proportionate contribution of the Raman spectra of each amino acid present in this protein. In DFT calculations, only the contributions of disulphide bonds between cysteines are included but the contribution of the peptide and hydrogen bonds have not been considered. We have recorded the Raman spectra of bovine insulin using micro-Raman set up. The experimental spectrum is found to be very similar with the resultant simulated Raman spectrum with some exceptions.
Collapse
Affiliation(s)
- Bidisha Tah
- Department of Spectroscopy, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Prabir Pal
- Department of Spectroscopy, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Sourav Roy
- Department of Physics and Meteorology, Indian Institute of Technology, Kharagpur, West Bengal 721302, India
| | - Debodyuti Dutta
- Department of Chemistry, Indian Institute of Technology, Kharagpur, West Bengal 721302, India
| | - Sabyashachi Mishra
- Department of Chemistry, Indian Institute of Technology, Kharagpur, West Bengal 721302, India
| | - Manash Ghosh
- Department of Spectroscopy, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - G B Talapatra
- Department of Spectroscopy, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India.
| |
Collapse
|
26
|
Sereda V, Lednev IK. Polarized Raman Spectroscopy of Aligned Insulin Fibrils. JOURNAL OF RAMAN SPECTROSCOPY : JRS 2014; 45:665-671. [PMID: 25316956 PMCID: PMC4194063 DOI: 10.1002/jrs.4523] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Amyloid fibrils are associated with many neurodegenerative diseases. The application of conventional techniques of structural biology, X-ray crystallography and solution NMR, for fibril characterization is limited because of the non-crystalline and insoluble nature of the fibrils. Here, polarized Raman spectroscopy was used to determine the orientation of selected chemical groups in aligned insulin fibrils, specifically of peptide carbonyls. The methodology is solely based on the measurement of the change in Raman scattered intensity as a function of the angle between the incident laser polarization and the aligned fibrils. The order parameters 〈 P2 〉 and 〈 P4 〉 of the orientation distribution function were obtained, and the most probable distribution of C=O group orientation was calculated. The results indicate that the peptides' carbonyl groups are oriented at an angle of 13±5° from the fibril axis, which is in consistent with previously reported qualitative descriptions of an almost parallel orientation of the C=O groups relative to the main fibril axis.
Collapse
Affiliation(s)
- Valentin Sereda
- 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
| |
Collapse
|
27
|
Kurouski D, Postiglione T, Deckert-Gaudig T, Deckert V, Lednev IK. Amide I vibrational mode suppression in surface (SERS) and tip (TERS) enhanced Raman spectra of protein specimens. Analyst 2013; 138:1665-73. [PMID: 23330149 DOI: 10.1039/c2an36478f] [Citation(s) in RCA: 110] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Surface- and tip-enhanced Raman spectroscopy (SERS and TERS) are modern spectroscopic techniques, which are becoming widely used and show a great potential for the structural characterisation of biological systems. Strong enhancement of the Raman signal through localised surface plasmon resonance enables chemical detection at the single-molecule scale. Enhanced Raman spectra collected from biological specimens, such as peptides, proteins or microorganisms, were often observed to lack the amide I band, which is commonly used as a marker for the interpretation of the secondary protein structure. The cause of this phenomenon was unclear for many decades. In this work, we investigated this phenomenon for native insulin and insulin fibrils using both TERS and SERS and compared these spectra to the spectra of well-defined homo peptides. The results indicate that the appearance of the amide I Raman band does not correlate with the protein aggregation state, but is instead determined by the size of the amino acid side chain. For short model peptides, the absence of the amide I band in TERS and SERS spectra correlates with the presence of a bulky side chain. Homo-glycine and -alanine, which are peptides with small side chain groups (H and CH(3), respectively), exhibited an intense amide I band in almost 100% of the acquired spectra. Peptides with bulky side chains, such as tyrosine and tryptophan, exhibited the amide I band in 70% and 31% of the acquired spectra, respectively.
Collapse
Affiliation(s)
- Dmitry Kurouski
- University at Albany, State University of New York, 1400 Washington Avenue, Albany, New York 12222, USA
| | | | | | | | | |
Collapse
|
28
|
Kurouski D, Deckert-Gaudig T, Deckert V, Lednev IK. Structure and composition of insulin fibril surfaces probed by TERS. J Am Chem Soc 2012; 134:13323-9. [PMID: 22813355 DOI: 10.1021/ja303263y] [Citation(s) in RCA: 113] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Amyloid fibrils associated with many neurodegenerative diseases are the most intriguing targets of modern structural biology. Significant knowledge has been accumulated about the morphology and fibril-core structure recently. However, no conventional methods could probe the fibril surface despite its significant role in the biological activity. Tip-enhanced Raman spectroscopy (TERS) offers a unique opportunity to characterize the surface structure of an individual fibril due to a high depth and lateral spatial resolution of the method in the nanometer range. Herein, TERS is utilized for characterizing the secondary structure and amino acid residue composition of the surface of insulin fibrils. It was found that the surface is strongly heterogeneous and consists of clusters with various protein conformations. More than 30% of the fibril surface is dominated by β-sheet secondary structure, further developing Dobson's model of amyloid fibrils (Jimenez et al. Proc. Natl. Acad. Sci. U.S.A. 2002, 99, 9196-9201). The propensity of various amino acids to be on the fibril surface and specific surface secondary structure elements were evaluated. β-sheet areas are rich in cysteine and aromatic amino acids, such as phenylalanine and tyrosine, whereas proline was found only in α-helical and unordered protein clusters. In addition, we showed that carboxyl, amino, and imino groups are nearly equally distributed over β-sheet and α-helix/unordered regions. Overall, this study provides valuable new information about the structure and composition of the insulin fibril surface and demonstrates the power of TERS for fibril characterization.
Collapse
Affiliation(s)
- Dmitry Kurouski
- University at Albany, State University of New York, 1400 Washington Avenue, Albany, New York 12222, USA
| | | | | | | |
Collapse
|
29
|
Booyjzsen C, Scarff CA, Moreton B, Portman I, Scrivens JH, Costantini G, Sadler PJ. Fibrillation of transferrin. Biochim Biophys Acta Gen Subj 2011; 1820:427-36. [PMID: 22119572 DOI: 10.1016/j.bbagen.2011.11.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2011] [Revised: 11/07/2011] [Accepted: 11/09/2011] [Indexed: 11/29/2022]
Abstract
BACKGROUND The nature of fibrillar deposits from aqueous solutions of human serum and recombinant human transferrin on mica and carbon-coated formvar surfaces has been investigated. METHODS AND RESULTS Atomic force microscopy showed that the deposition of recombinant transferrin onto the hydrophilic surface of mica resulted in the formation of a monolayer-thick film composed of conformationally-strained flattened protein molecules. Elongated fibres developed on top of this layer and appeared to be composed of single proteins or small clusters thereof. Monomeric and dimeric transferrins were separated by gel permeation chromatography and their states of aggregation confirmed by mass spectrometry and dynamic light scattering. Transmission electron-microscopy showed that dimeric transferrin, but not monomeric transferrin, deposited on carbon-coated formvar grids forms rounded (circular) structures ca. 250nm in diameter. Small transferrin fibrils ca. 250nm long appeared to be composed of smaller rounded sub-units. Synchrotron radiation-circular dichroism and, Congo red and thioflavin-T dye-binding experiments suggested that transferrin aggregation in solution does not involve major structural changes to the protein or formation of classical β-sheet amyloid structures. Collisional cross sections determined via ion mobility-mass spectrometry showed little difference between the overall protein shapes of apo- and holo-transferrin in the gas phase. GENERAL SIGNIFICANCE The possibility that transferrin deformation and aggregation are involved in neurological disorders such as Parkinson's and Alzheimer's disease is discussed. This article is part of a Special Issue entitled Transferrins: Molecular mechanisms of iron transport and disorders.
Collapse
Affiliation(s)
- Claire Booyjzsen
- Department of Chemistry, University of Warwick, Coventry, CV4 7AL, UK
| | | | | | | | | | | | | |
Collapse
|
30
|
Oboroceanu D, Wang L, Kroes-Nijboer A, Brodkorb A, Venema P, Magner E, Auty MA. The effect of high pressure microfluidization on the structure and length distribution of whey protein fibrils. Int Dairy J 2011. [DOI: 10.1016/j.idairyj.2011.03.015] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
31
|
Shanmugam G, Polavarapu PL. Isotope-assisted vibrational circular dichroism investigations of amyloid β peptide fragment, Aβ(16-22). J Struct Biol 2011; 176:212-9. [PMID: 21855637 DOI: 10.1016/j.jsb.2011.08.004] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2011] [Revised: 07/26/2011] [Accepted: 08/04/2011] [Indexed: 10/17/2022]
Abstract
Isotope-assisted vibrational circular dichroism (VCD) investigations have been used to probe the site specific local structure of an amyloid peptide for the first time. A seven residue peptide, NH(2)-KLVFFAE-COOH, which represents the Aβ(16-22) fragment of the Alzheimer's amyloid β peptide, was used for these investigations. (13)C labels were introduced separately at the carbonyl group of leucine (residue 17), alanine (residue 21) and also at both sites together. Since VCD spectra provide structure dependent signs, band shapes and frequencies, the isotope-assisted VCD spectroscopy revealed information on site specific secondary structure of the polypeptide. Isotope dilution VCD experiments provided a means to distinguish between parallel and anti-parallel nature of the β-sheet structure formed by the Aβ(16-22) fragment. The current results establish the usefulness of isotope-assisted VCD analysis in determining the site specific secondary structure of amyloid peptides.
Collapse
Affiliation(s)
- Ganesh Shanmugam
- Department of Chemistry, Vanderbilt University, Nashville, TN 37235, USA
| | | |
Collapse
|
32
|
Halvorson RA, Vikesland PJ. Drop coating deposition Raman (DCDR) for microcystin-LR identification and quantitation. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2011; 45:5644-5651. [PMID: 21630655 DOI: 10.1021/es200255y] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A drop coating deposition Raman (DCDR) method was developed for the analysis of 2-200 ng samples of microcystin-LR (MC-LR), a ubiquitous and deadly hepatotoxin secreted by cyanobacteria. Solid phase extraction (SPE) of the toxin from a water sample enabled identification of MC-LR at 5 μg/L to 100 mg/L concentrations, and the collected results suggest lower detection limits can be readily attained following DCDR substrate modification. The DCDR process was applied to aqueous sample volumes of 0.5-20 μL that generated sample deposits from which MC-LR Raman spectra could be obtained within seconds. Larger volume samples were not required to improve spectral resolution. Volumes of 2 μL were ideal, producing "coffee-ring" MC-LR deposits that displayed distinct MC-LR Raman signals with high signal-to-noise within 1 s for a 200 ng sample and 300 s for a 2 ng sample. A linear correlation between Raman signal intensity and concentration was observed for 2-100 ng MC-LR samples after signal normalization. Reproducible MC-LR Raman spectra were collected from both fresh and aged samples. The presence of dissolved organic matter (DOM) did not preclude MC-LR identification in DCDR deposits of 3 μg of DOM mixed with 0.7 μg of MC-LR. Application of DCDR to environmental samples will require sample purification such as SPE before analysis, including critical cartridge wash and toxin rinsing steps. Raman based methods may one day facilitate simpler and faster sample throughput than traditional MC-LR detection methods.
Collapse
Affiliation(s)
- Rebecca A Halvorson
- Department of Civil and Environmental Engineering and Institute of Critical Technology and Applied Science, Virginia Tech , 418 Durham Hall, Blacksburg, Virginia 24060-0246, United States
| | | |
Collapse
|
33
|
Raynes JK, Pearce FG, Meade SJ, Gerrard JA. Immobilization of organophosphate hydrolase on an amyloid fibril nanoscaffold: towards bioremediation and chemical detoxification. Biotechnol Prog 2010; 27:360-7. [PMID: 21485029 DOI: 10.1002/btpr.518] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2010] [Revised: 08/22/2010] [Indexed: 11/07/2022]
Abstract
Organophosphate hydrolase has potential as a bioremediation and chemical detoxification enzyme, but the problems of reusability and stability need to be addressed to use this enzyme on an industrial scale. Immobilizing the enzyme to a nanoscaffold may help to solve these problems. Amyloid fibrils generated from insulin and crystallin provided a novel nanoscaffold for the immobilization of organophosphate hydrolase, using glutaraldehyde as the crosslinking reagent. Electrophoretic, centrifugation, and temperature stability experiments, together with transmission electron microscopy were undertaken to verify that crosslinking had successfully occurred. The resulting fibrils remained active towards the substrate paraoxon and when immobilized to the insulin amyloid fibrils, the enzyme exhibited a significant (∼ 300%) increase in the relative temperature stability at 40, 45, and 50°C (as measured by comparing the initial enzyme activity to the activity remaining after heating), compared to free enzyme. This confirms that amyloid fibrils could provide a new type of nanoscaffold for enzyme immobilization.
Collapse
Affiliation(s)
- Jared K Raynes
- Biomolecular Interaction Centre and School of Biological Sciences, University of Canterbury, Private Bag 4800, Christchurch, New Zealand.
| | | | | | | |
Collapse
|
34
|
Zhang D, Vangala K, Jiang D, Zou S, Pechan T. Drop coating deposition Raman spectroscopy of fluorescein isothiocyanate labeled protein. APPLIED SPECTROSCOPY 2010; 64:1078-85. [PMID: 20925976 PMCID: PMC3218434 DOI: 10.1366/000370210792973497] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Using bovine serum albumin (BSA) as the model protein, normal Raman spectra of fluorescein isothiocyanate (FITC) conjugated protein were systematically studied for the first time using both solution and the drop coating deposition Raman (DCDR) sampling techniques. The FITC-BSA Raman spectra are dominated by the FITC Raman features that are strongly pH dependent. Current DCDR detection sensitivity obtained with a 10:1 FITC-BSA conjugate is 45 fmol in terms of total protein consumption and ∼15 attomol at laser probed volume. Unlike the FITC-BSA solution Raman spectra, where the FITC Raman features are photostable, concurrent FITC fluorescence and Raman photobleaching is observed in the DCDR spectra of FITC-BSA. While the FITC Raman photobleaching follows a single exponential decay function with a time constant independent of the FITC labeling ratio, the fluorescence background photobleaching is much more complicated and it depends strongly on the FITC labeling ratio and sample conditions. Mechanistically, the FITC Raman photobleaching is believed to be due to photochemical reaction of the FITC molecules in the electronically excited state. The FITC fluorescence photobleaching involves both concentration quenching and photochemical quenching, and the latter may involve a photochemical intermediate that is fluorescence inactive but Raman active.
Collapse
Affiliation(s)
- Dongmao Zhang
- Department of Chemistry, Mississippi State University, Mississippi State, Mississippi 39762, USA.
| | | | | | | | | |
Collapse
|
35
|
White DA, Buell AK, Knowles TPJ, Welland ME, Dobson CM. Protein Aggregation in Crowded Environments. J Am Chem Soc 2010; 132:5170-5. [DOI: 10.1021/ja909997e] [Citation(s) in RCA: 127] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Duncan A. White
- Department of Chemistry, University of Cambridge, Cambridge, U.K. CB2 1EW, and Nanoscience Centre, University of Cambridge, Cambridge, U.K. CB3 0FF
| | - Alexander K. Buell
- Department of Chemistry, University of Cambridge, Cambridge, U.K. CB2 1EW, and Nanoscience Centre, University of Cambridge, Cambridge, U.K. CB3 0FF
| | - Tuomas P. J. Knowles
- Department of Chemistry, University of Cambridge, Cambridge, U.K. CB2 1EW, and Nanoscience Centre, University of Cambridge, Cambridge, U.K. CB3 0FF
| | - Mark E. Welland
- Department of Chemistry, University of Cambridge, Cambridge, U.K. CB2 1EW, and Nanoscience Centre, University of Cambridge, Cambridge, U.K. CB3 0FF
| | - Christopher M. Dobson
- Department of Chemistry, University of Cambridge, Cambridge, U.K. CB2 1EW, and Nanoscience Centre, University of Cambridge, Cambridge, U.K. CB3 0FF
| |
Collapse
|
36
|
Oboroceanu D, Wang L, Brodkorb A, Magner E, Auty MAE. Characterization of beta-lactoglobulin fibrillar assembly using atomic force microscopy, polyacrylamide gel electrophoresis, and in situ fourier transform infrared spectroscopy. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2010; 58:3667-3673. [PMID: 20187607 DOI: 10.1021/jf9042908] [Citation(s) in RCA: 93] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The aggregation process of beta-lactoglobulin (beta-lg) from 0 min to 20 h was studied using atomic force microscopy (AFM), scanning transmission electron microscopy (STEM), sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE), and in situ attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR). Fibril assembly was monitored in real time using AFM up to 20 h. From 0 to 85 min, beta-lg monomers deformed and expanded with some aggregation. After 85 min, fibrillar structures were formed, exceeding 10 mum in length. Fibrillar structures were confirmed by STEM. Secondary structural changes occurring during fibril formation were monitored by ATR-FTIR at 80 degrees C and indicated a decrease in alpha-helix content and an increase in beta-sheet content. SDS-PAGE indicated that fibrils were composed of polypeptides and not intact monomers. In this study, beta-lg and whey protein isolate (WPI)-derived fibrils, including some double helices, in water were observed by AFM under ambient conditions and in their native aqueous environment.
Collapse
Affiliation(s)
- Daniela Oboroceanu
- Moorepark Food Research Centre, Teagasc, Moorepark, Fermoy, County Cork, Ireland
| | | | | | | | | |
Collapse
|
37
|
Zhang D, Jiang D, Yanney M, Zou S, Sygula A. Ratiometric Raman spectroscopy for quantification of protein oxidative damage. Anal Biochem 2009; 391:121-6. [PMID: 19457432 PMCID: PMC2773654 DOI: 10.1016/j.ab.2009.05.019] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2009] [Revised: 05/06/2009] [Accepted: 05/12/2009] [Indexed: 01/13/2023]
Abstract
A novel ratiometric Raman spectroscopic (RMRS) method has been developed for quantitative determination of protein carbonyl levels. Oxidized bovine serum albumin (BSA) and oxidized lysozyme were used as model proteins to demonstrate this method. The technique involves conjugation of protein carbonyls with dinitrophenyl hydrazine (DNPH), followed by drop coating deposition Raman spectral acquisition (DCDR). The RMRS method is easy to implement because it requires only one conjugation reaction, uses a single spectral acquisition, and does not require sample calibration. Characteristic peaks from both protein and DNPH moieties are obtained in a single spectral acquisition, allowing the protein carbonyl level to be calculated from the peak intensity ratio. Detection sensitivity for the RMRS method is approximately 0.33 pmol carbonyl per measurement. Fluorescence and/or immunoassay-based techniques only detect a signal from the labeling molecule and, thus, yield no structural or quantitative information for the modified protein, whereas the RMRS technique allows protein identification and protein carbonyl quantification in a single experiment.
Collapse
Affiliation(s)
- Dongmao Zhang
- Department of Chemistry, Mississippi State University, Mississippi State, MS 39762, USA.
| | | | | | | | | |
Collapse
|
38
|
Langkilde AE, Vestergaard B. Methods for structural characterization of prefibrillar intermediates and amyloid fibrils. FEBS Lett 2009; 583:2600-9. [PMID: 19481541 DOI: 10.1016/j.febslet.2009.05.040] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2009] [Revised: 05/20/2009] [Accepted: 05/22/2009] [Indexed: 11/15/2022]
Abstract
Protein fibrillation is first and foremost a structural phenomenon. Adequate structural investigation of the central conformational individuals of the fibrillation process is however exceedingly difficult. This is due to the nature of the process, which may be described as a dynamically evolving equilibrium between a large number of structural species. These are furthermore of highly diverging sizes and present in very uneven amounts and timeframes. Different structural methods have different strengths and limitations. These, and in particular recent advances within solution analysis of the undisturbed equilibrium using small angle X-ray scattering, are reviewed here.
Collapse
Affiliation(s)
- Annette Eva Langkilde
- Department of Medicinal Chemistry, Faculty of Pharmaceutical Sciences, University of Copenhagen, Copenhagen, Denmark
| | | |
Collapse
|
39
|
Jha S, Sellin D, Seidel R, Winter R. Amyloidogenic propensities and conformational properties of ProIAPP and IAPP in the presence of lipid bilayer membranes. J Mol Biol 2009; 389:907-20. [PMID: 19427320 DOI: 10.1016/j.jmb.2009.04.077] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2008] [Revised: 04/15/2009] [Accepted: 04/30/2009] [Indexed: 11/30/2022]
Abstract
Human islet amyloid polypeptide (hIAPP), which is considered the primary culprit for beta-cell loss in type 2 diabetes mellitus patients, is synthesized in beta-cells of the pancreas from its precursor pro-islet amyloid polypeptide (proIAPP), which may be important in early intracellular amyloid formation as well. We compare the amyloidogenic propensities and conformational properties of proIAPP and hIAPP in the presence of negatively charged lipid membranes, which have been discussed as loci of initiation of the fibrillation reaction. Circular dichroism studies verify the initial secondary structures of proIAPP and hIAPP to be predominantly unordered with small amounts of ordered secondary structure elements, and exhibit minor differences between these two peptides only. Using attenuated total reflection-Fourier transform infrared spectroscopy and thioflavin T fluorescence spectroscopy, as well as atomic force microscopy, we show that in the presence of negatively charged membranes, proIAPP exhibits a much higher amyloidogenic propensity than in bulk solvent. Compared to hIAPP, it is still much less amyloidogenic, however. Although differences in the secondary structures of the aggregated species of hIAPP and proIAPP at the lipid interface are small, they are reflected in morphological changes. Unlike hIAPP, proIAPP forms essentially oligomeric-like structures at the lipid interface. Besides the interaction with anionic membranes [1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC)+x1,2-dioleoyl-sn-glycero-3-[phospho-rac-(1-glycerol)]], interaction with zwitterionic homogeneous (DOPC) and heterogeneous (1,2-dipalmitoyl-sn-glycero-3-phosphocholine:DOPC:cholesterol 1:2:1 model raft mixture) membranes has also been studied. Both peptides do not aggregate significantly at DOPC bilayers. In the presence of the model raft membrane, hIAPP aggregates markedly as well. Conversely, proIAPP clusters into less ordered structures and to a minor extent at raft membranes only. The addition of proIAPP to hIAPP retards the hIAPP fibrillation process also in the presence of negatively charged lipid bilayers. In excess proIAPP, increased aggregation levels are finally observed, however, which could be attributed to seed-induced cofibrillation of proIAPP.
Collapse
Affiliation(s)
- Suman Jha
- Department of Chemistry, TU Dortmund University, Germany
| | | | | | | |
Collapse
|
40
|
Raman spectroscopic investigation on the interaction of malignanthepatocytes with doxorubicin. Biophys Chem 2009; 140:57-61. [DOI: 10.1016/j.bpc.2008.11.005] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2008] [Accepted: 11/17/2008] [Indexed: 11/24/2022]
|
41
|
Zhang D, Neumann O, Wang H, Yuwono VM, Barhoumi A, Perham M, Hartgerink JD, Wittung-Stafshede P, Halas NJ. Gold nanoparticles can induce the formation of protein-based aggregates at physiological pH. NANO LETTERS 2009; 9:666-71. [PMID: 19199758 DOI: 10.1021/nl803054h] [Citation(s) in RCA: 281] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Protein-nanoparticle interactions are of central importance in the biomedical applications of nanoparticles, as well as in the growing biosafety concerns of nanomaterials. We observe that gold nanoparticles initiate protein aggregation at physiological pH, resulting in the formation of extended, amorphous protein-nanoparticle assemblies, accompanied by large protein aggregates without embedded nanoparticles. Proteins at the Au nanoparticle surface are observed to be partially unfolded; these nanoparticle-induced misfolded proteins likely catalyze the observed aggregate formation and growth.
Collapse
Affiliation(s)
- Dongmao Zhang
- Department of Electrical and Computer Engineering, Rice University, Houston, Texas 77005, USA
| | | | | | | | | | | | | | | | | |
Collapse
|