1
|
Han XF, Sun WH, Wang SJ, Lu XL. Sum frequency spectroscopy studies on cell membrane fusion induced by divalent cations. CHINESE J CHEM PHYS 2022. [DOI: 10.1063/1674-0068/cjcp2110213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Cell membrane fusion is a fundamental biological process involved in a number of cellular living functions. Regarding this, divalent cations can induce fusion of the lipid bilayers through binding and bridging of divalent cations to the charged lipids, thus leading to the cell membrane fusion. How-ever, the elaborate mechanism of cell membrane fusion induced by divalent cations is still needed to be elucidated. Here, surface/interface sensitive sum frequency generation vibrational spectroscopy (SFG-VS) and dynamic light scattering (DLS) were applied in this research to study the responses of phospholipid monolayer to the exposure of divalent metal ions i.e. Ca2+ and Mg2+. According to the particle size distribution results measured by DLS experiments, it was found that Ca2+ could induce inter-vesicular fusion while Mg2+ could not. An octadecyltrichlorosilane self-assembled monolayer (OTS SAM)-lipid monolayer system was designed to model the cell membrane for the SFG-VS experiment. Ca2+ could interact with the lipid PO2− head groups more strongly, resulting in cell membrane fusion more easily, in comparison with Mg2+. No specific interaction between the two metal cations and the C=O groups was observed. However, the C=O orientations changed more after Ca2+-PO2− binding than Mg2+ mediation on lipid monolayer. Meanwhile, Ca2+ could induce dehydration of the lipids (which should be related to the strong Ca2+-PO2− interaction), leading to the reduced hindrance for cell membrane fusion.
Collapse
Affiliation(s)
- Xiao-feng Han
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, National Demonstration Center for Experimental, Biomedical Engineering Education, Southeast University, Nanjing 210096, China
| | - Wen-hua Sun
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, National Demonstration Center for Experimental, Biomedical Engineering Education, Southeast University, Nanjing 210096, China
| | - Shu-jing Wang
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, National Demonstration Center for Experimental, Biomedical Engineering Education, Southeast University, Nanjing 210096, China
| | - Xiao-lin Lu
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, National Demonstration Center for Experimental, Biomedical Engineering Education, Southeast University, Nanjing 210096, China
| |
Collapse
|
2
|
Weidner T, Castner DG. Developments and Ongoing Challenges for Analysis of Surface-Bound Proteins. ANNUAL REVIEW OF ANALYTICAL CHEMISTRY (PALO ALTO, CALIF.) 2021; 14:389-412. [PMID: 33979545 PMCID: PMC8522203 DOI: 10.1146/annurev-anchem-091520-010206] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Proteins at surfaces and interfaces play important roles in the function and performance of materials in applications ranging from diagnostic assays to biomedical devices. To improve the performance of these materials, detailed molecular structure (conformation and orientation) along with the identity and concentrations of the surface-bound proteins on those materials must be determined. This article describes radiolabeling, surface plasmon resonance, quartz crystal microbalance with dissipation, X-ray photoelectron spectroscopy, secondary ion mass spectrometry, sum frequency generation spectroscopy, and computational techniques along with the information each technique provides for characterizing protein films. A multitechnique approach using both experimental and computation methods is required for these investigations. Although it is now possible to gain much insight into the structure of surface-bound proteins, it is still not possible to obtain the same level of structural detail about proteins on surfaces as can be obtained about proteins in crystals and solutions, especially for large, complex proteins. However, recent results have shown it is possible to obtain detailed structural information (e.g., backbone and side chain orientation) about small peptides (5-20 amino sequences) on surfaces. Current studies are extending these investigations to small proteins such as protein G B1 (∼6 kDa). Approaches for furthering the capabilities for characterizing the molecular structure of surface-bound proteins are proposed.
Collapse
Affiliation(s)
- Tobias Weidner
- Department of Chemistry, Aarhus University, 8000 Aarhus C, Denmark;
| | - David G Castner
- National ESCA and Surface Analysis Center for Biomedical Problems, Departments of Bioengineering and Chemical Engineering, University of Washington, Seattle, Washington 98195, USA;
| |
Collapse
|
3
|
Gogoi A, Konwer S, Zhuo GY. Polarimetric Measurements of Surface Chirality Based on Linear and Nonlinear Light Scattering. Front Chem 2021; 8:611833. [PMID: 33644001 PMCID: PMC7902787 DOI: 10.3389/fchem.2020.611833] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Accepted: 12/31/2020] [Indexed: 01/21/2023] Open
Abstract
A molecule, molecular aggregate, or protein that cannot be superimposed on its mirror image presents chirality. Most living systems are organized by chiral building blocks, such as amino acids, peptides, and carbohydrates, and any change in their molecular structure (i.e., handedness or helicity) alters the biochemical and pharmacological functions of the molecules, many of which take place at surfaces. Therefore, studying surface chirogenesis at the nanoscale is fundamentally important and derives various applications. For example, since proteins contain highly ordered secondary structures, the intrinsic chirality can be served as a signature to measure the dynamics of protein adsorption and protein conformational changes at biological surfaces. Furthermore, a better understanding of chiral recognition and separation at bio-nanointerfaces is helpful to standardize chiral drugs and monitor the synthesis of adsorbents with high precision. Thus, exploring the changes in surface chirality with polarized excitations would provide structural and biochemical information of the adsorbed molecules, which has led to the development of label-free and noninvasive measurement tools based on linear and nonlinear optical effects. In this review, the principles and selected applications of linear and nonlinear optical methods for quantifying surface chirality are introduced and compared, aiming to conceptualize new ideas to address critical issues in surface biochemistry.
Collapse
Affiliation(s)
- Ankur Gogoi
- Department of Physics, Jagannath Barooah College, Jorhat, India
| | - Surajit Konwer
- Department of Chemistry, Dibrugarh University, Dibrugarh, India
| | - Guan-Yu Zhuo
- Institute of New Drug Development, China Medical University, Taichung, Taiwan.,Integrative Stem Cell Center, China Medical University Hospital, Taichung, Taiwan
| |
Collapse
|
4
|
Hu XH, Fu L, Hou J, Zhang YN, Zhang Z, Wang HF. N-H Chirality in Folded Peptide LK 7β Is Governed by the C α-H Chirality. J Phys Chem Lett 2020; 11:1282-1290. [PMID: 31977221 DOI: 10.1021/acs.jpclett.9b03470] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Recent chiral sum-frequency generation vibrational spectroscopy (SFG-VS) measurements revealed that two N-H stretching modes in the 3100-3500 cm-1 range in folded peptide LK7β exhibit chiral characteristics. Here, we report the first phase-resolved subwavenumber high-resolution broadband SFG-VS (HR-BB-SFG-VS) measurement of the folded peptide LK7β. The results show that this chiral N-H band consists of four, instead of two, distinctive peaks, and they are with two groups of opposite spectral phases. Moreover, the phases of these N-H peaks completely flip from the l-LK7β to the d-LK7β peptide, suggesting that the chirality of the N-H in the folded peptide LK7β is completely governed by the chirality of the Cα-H of the amino acids. This discovery provides a clue on why proteins in nature are composed of the α-amino acids rather than β- or γ-amino acids and may help us understand how life works.
Collapse
Affiliation(s)
- Xiao-Hua Hu
- Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials , Fudan University , 220 Handan Road , Shanghai 200433 , China
| | - Li Fu
- William R. Wiley Environmental Molecular Sciences Laboratory , Pacific Northwest National Laboratory , Richland , Washington 99352 , United States
| | - Jian Hou
- Beijing National Laboratory for Molecular Sciences , Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190 , China
| | - Yue-Ning Zhang
- Beijing National Laboratory for Molecular Sciences , Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190 , China
| | - Zhen Zhang
- Beijing National Laboratory for Molecular Sciences , Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190 , China
| | - Hong-Fei Wang
- Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials , Fudan University , 220 Handan Road , Shanghai 200433 , China
- School of Science , Westlake University , 18 Shilongshan Road , Hangzhou 310024 , China
| |
Collapse
|
5
|
Hosseinpour S, Roeters SJ, Bonn M, Peukert W, Woutersen S, Weidner T. Structure and Dynamics of Interfacial Peptides and Proteins from Vibrational Sum-Frequency Generation Spectroscopy. Chem Rev 2020; 120:3420-3465. [DOI: 10.1021/acs.chemrev.9b00410] [Citation(s) in RCA: 75] [Impact Index Per Article: 18.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Saman Hosseinpour
- Institute of Particle Technology (LFG), Friedrich-Alexander-University Erlangen-Nürnberg (FAU), 91058 Erlangen, Germany
| | | | - Mischa Bonn
- Molecular Spectroscopy Department, Max Planck Institute for Polymer Research, 55128 Mainz, Germany
| | - Wolfgang Peukert
- Institute of Particle Technology (LFG), Friedrich-Alexander-University Erlangen-Nürnberg (FAU), 91058 Erlangen, Germany
| | - Sander Woutersen
- Van’t Hoff Institute for Molecular Sciences, University of Amsterdam, 1098 EP Amsterdam, The Netherlands
| | - Tobias Weidner
- Department of Chemistry, Aarhus University, 8000 Aarhus C, Denmark
| |
Collapse
|
6
|
Bulk-or-interface assignment of heterodyne-detected chiral vibrational sum frequency generation signal by its polarization dependence. J Chem Phys 2018; 149:244703. [DOI: 10.1063/1.5063290] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
|
7
|
Lin L, Zhang Z, Guo Y, Liu M. Fabrication of Supramolecular Chirality from Achiral Molecules at the Liquid/Liquid Interface Studied by Second Harmonic Generation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:139-146. [PMID: 29244509 DOI: 10.1021/acs.langmuir.7b04170] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We present the investigation into the supramolecular chirality of 5-octadecyloxy-2-(2-pyridylazo)phenol (PARC18) at water/1,2-dichloroethane interface by second harmonic generation (SHG). We observe that PARC18 molecules form supramolecular chirality through self-assembly at the liquid/liquid interface although they are achiral molecules. The bulk concentration of PARC18 in the organic phase has profound effects on the supramolecular chirality. By increasing bulk concentration, the enantiomeric excess at the interface first grows and then decreases until it eventually vanishes. Further analysis reveals that the enantiomeric excess is determined by the twist angle of PARC18 molecules at the interface rather than their orientational angle. At lower and higher bulk concentrations, the average twist angle of PARC18 molecules approaches zero, and the assemblies are achiral; whereas at medium bulk concentrations, the average twist angle is nonzero, so that the assemblies show supramolecular chirality. We also estimate the coverage of PARC18 molecules at the interface versus the bulk concentration and fit it to Langmuir adsorption model. The result indicates that PARC18 assemblies show strongest supramolecular chirality in a half-full monolayer. These findings highlight the opportunities for precise control of supramolecular chirality at liquid/liquid interfaces by manipulating the bulk concentration.
Collapse
Affiliation(s)
- Lu Lin
- National Center for Nanoscience and Technology , Beijing 100190, P. R. China
- Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, P. R. China
| | - Zhen Zhang
- Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, P. R. China
| | - Yuan Guo
- Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, P. R. China
- University of Chinese Academy of Sciences , Beijing 100049, P. R. China
| | - Minghua Liu
- Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, P. R. China
| |
Collapse
|
8
|
Wei F, Xia WX, Hu ZJ, Li WH, Zhang JY, Zheng WQ. Laser Linewidth and Spectral Resolution in Infrared Scanning Sum Frequency Generation Vibrational Spectroscopy System. CHINESE J CHEM PHYS 2016. [DOI: 10.1063/1674-0068/29/cjcp1601001] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
|
9
|
Reinscheid F, Reinscheid U. Stereochemical analysis of (+)-limonene using theoretical and experimental NMR and chiroptical data. J Mol Struct 2016. [DOI: 10.1016/j.molstruc.2015.10.061] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
|
10
|
Fu L, Chen SL, Wang HF. Validation of Spectra and Phase in Sub-1 cm(-1) Resolution Sum-Frequency Generation Vibrational Spectroscopy through Internal Heterodyne Phase-Resolved Measurement. J Phys Chem B 2015; 120:1579-89. [PMID: 26509581 DOI: 10.1021/acs.jpcb.5b07780] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Reliable determination of the spectral features and their phases in sum-frequency generation vibrational spectroscopy (SFG-VS) for surfaces with closely overlapping peaks has been a standing issue. Here we present two approaches toward resolving such issue. The first utilizes the high-resolution and accurate line shape from the recently developed subwavenumber high-resolution broadband SFG-VS (HR-BB-SFG-VS), from which the detail spectral parameters, including relative spectral phases, of overlapping peaks can be determined through reliable spectral fitting. These results are further validated by using the second method that utilizes the azimuthal angle phase dependence of the z-cut α-quartz crystal, a common phase standard, through the spectral interference between the SFG fields of the quartz surface, as the internal phase reference, and the adsorbed molecular layer. Even though this approach is limited to molecular layers that can be transferred or deposited onto the quartz surface, it is simple and straightforward, as it requires only an internal phase standard with a single measurement that is free of phase drifts. More importantly, it provides unambiguous SFG spectral phase information on such surfaces. Using this method, the absolute phase of the molecular susceptibility tensors of the CH3, CH2, and chiral C-H groups in different Langmuir-Blodgett (LB) molecular monolayers and drop-cast peptide films are determined. These two approaches are fully consistent with and complement to each other, making both easily applicable tools in SFG-VS studies. More importantly, because the HR-BB-SFG-VS technique can be easily applied to various surfaces and interfaces, such validation of the spectral and phase information from HR-BB-SFG-VS measurement demonstrates it as one of the most promising tools for interrogating the detailed structure and interactions of complex molecular interfaces.
Collapse
Affiliation(s)
- Li Fu
- William R. Wiley Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory , 902 Battelle Boulevard, P.O. Box 999, Richland, Washington 99352, United States
| | - Shun-Li Chen
- William R. Wiley Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory , 902 Battelle Boulevard, P.O. Box 999, Richland, Washington 99352, United States
| | - Hong-Fei Wang
- William R. Wiley Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory , 902 Battelle Boulevard, P.O. Box 999, Richland, Washington 99352, United States
| |
Collapse
|
11
|
McDermott ML, Petersen PB. Robust Self-Referencing Method for Chiral Sum Frequency Generation Spectroscopy. J Phys Chem B 2015; 119:12417-23. [DOI: 10.1021/acs.jpcb.5b08176] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- M. Luke McDermott
- Department
of Chemistry and
Chemical Biology, Cornell University, Ithaca, New York 14853, United States
| | - Poul B. Petersen
- Department
of Chemistry and
Chemical Biology, Cornell University, Ithaca, New York 14853, United States
| |
Collapse
|
12
|
Wang HF, Velarde L, Gan W, Fu L. Quantitative Sum-Frequency Generation Vibrational Spectroscopy of Molecular Surfaces and Interfaces: Lineshape, Polarization, and Orientation. Annu Rev Phys Chem 2015; 66:189-216. [DOI: 10.1146/annurev-physchem-040214-121322] [Citation(s) in RCA: 156] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Hong-Fei Wang
- William R. Wiley Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99352;
| | - Luis Velarde
- Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, New York 14260
| | - Wei Gan
- Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Urumqi, Xinjiang 830011, China
| | - Li Fu
- William R. Wiley Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99352;
| |
Collapse
|
13
|
Wei F, Xiong W, Li W, Lu W, Allen HC, Zheng W. Assembly and relaxation behaviours of phosphatidylethanolamine monolayers investigated by polarization and frequency resolved SFG-VS. Phys Chem Chem Phys 2015; 17:25114-22. [DOI: 10.1039/c5cp03977k] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Polarization and frequency resolved SFG-VS to distinguish the head/tail groups of lipids, to resolve the assembly and relaxation kinetics of monolayers.
Collapse
Affiliation(s)
- Feng Wei
- Institution for Interdisciplinary Research
- Jianghan University
- Wuhan
- China
| | - Wei Xiong
- Institution for Interdisciplinary Research
- Jianghan University
- Wuhan
- China
| | - Wenhui Li
- Institution for Interdisciplinary Research
- Jianghan University
- Wuhan
- China
| | - Wangting Lu
- Institution for Interdisciplinary Research
- Jianghan University
- Wuhan
- China
| | - Heather C. Allen
- Department of Chemistry and Biochemistry
- The Ohio State University
- Columbus
- USA
| | - Wanquan Zheng
- Institution for Interdisciplinary Research
- Jianghan University
- Wuhan
- China
- Institut des Sciences Moléculaires d'Orsay
| |
Collapse
|
14
|
Okuno M, Ishibashi TA. Chirality Discriminated by Heterodyne-Detected Vibrational Sum Frequency Generation. J Phys Chem Lett 2014; 5:2874-2878. [PMID: 26278092 DOI: 10.1021/jz501158r] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We first demonstrated chiral vibrational sum frequency generation (VSFG) in the heterodyne detection, which enables us to uniquely determine chiral second-order nonlinear susceptibility consisting of phase and amplitude and distinguish molecular chirality with high sensitivity. Liquid limonene was measured to evaluate the heterodyne-detected chiral VSFG developed in this study. R-(+)- and S-(-)-limonene showed clearly opposite signs in the complex spectra of the second-order nonlinear susceptibility in the CH stretching region. This is the first report of the chiral distinction by VSFG without any a priori knowledge about chiral and achiral spectral response. Furthermore, from the phase of the chiral VSFG field measured in the heterodyne detection, the origin of the chiral signal was ascribed to the bulk limonene. The heterodyne detection also improves detection limits significantly, allowing us to observe weak chiral signals in reflection. The heterodyne-detected chiral VSFG can provide information on absolute molecular configuration.
Collapse
Affiliation(s)
- Masanari Okuno
- Department of Chemistry, Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8571 Japan
| | - Taka-Aki Ishibashi
- Department of Chemistry, Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8571 Japan
| |
Collapse
|
15
|
Fu L, Zhang Y, Wei ZH, Wang HF. Intrinsic Chirality and Prochirality at Air/R-(+)- and S-(-)-Limonene Interfaces: Spectral Signatures With Interference Chiral Sum-Frequency Generation Vibrational Spectroscopy. Chirality 2014; 26:509-20. [DOI: 10.1002/chir.22337] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2013] [Accepted: 04/12/2014] [Indexed: 11/06/2022]
Affiliation(s)
- Li Fu
- William R. Wiley Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory; Richland Washington
| | - Yun Zhang
- William R. Wiley Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory; Richland Washington
| | - Zhe-Hao Wei
- William R. Wiley Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory; Richland Washington
| | - Hong-Fei Wang
- William R. Wiley Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory; Richland Washington
| |
Collapse
|
16
|
Yan ECY, Fu L, Wang Z, Liu W. Biological Macromolecules at Interfaces Probed by Chiral Vibrational Sum Frequency Generation Spectroscopy. Chem Rev 2014; 114:8471-98. [DOI: 10.1021/cr4006044] [Citation(s) in RCA: 189] [Impact Index Per Article: 18.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Elsa C. Y. Yan
- Department of Chemistry, Yale University, 225 Prospect
Street, New Haven, Connecticut 06520, United States
| | - Li Fu
- Department of Chemistry, Yale University, 225 Prospect
Street, New Haven, Connecticut 06520, United States
| | - Zhuguang Wang
- Department of Chemistry, Yale University, 225 Prospect
Street, New Haven, Connecticut 06520, United States
| | - Wei Liu
- Department of Chemistry, Yale University, 225 Prospect
Street, New Haven, Connecticut 06520, United States
| |
Collapse
|
17
|
Fu L, Wang Z, Yan ECY. N-H Stretching Modes Around 3300 Wavenumber From Peptide Backbones Observed by Chiral Sum Frequency Generation Vibrational Spectroscopy. Chirality 2014; 26:521-4. [DOI: 10.1002/chir.22306] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2013] [Accepted: 01/13/2014] [Indexed: 12/15/2022]
Affiliation(s)
- Li Fu
- Departmtent of Chemistry; Yale University; New Haven CT
| | - Zhuguang Wang
- Departmtent of Chemistry; Yale University; New Haven CT
| | | |
Collapse
|
18
|
Amphiphilic adsorption of human islet amyloid polypeptide aggregates to lipid/aqueous interfaces. J Mol Biol 2011; 421:537-47. [PMID: 22210153 DOI: 10.1016/j.jmb.2011.12.035] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2011] [Revised: 12/15/2011] [Accepted: 12/17/2011] [Indexed: 11/23/2022]
Abstract
Many amyloid proteins misfold into β-sheet aggregates upon interacting with biomembranes at the onset of diseases, such as Parkinson's disease and type II diabetes. The molecular mechanisms triggering aggregation depend on the orientation of β-sheets at the cell membranes. However, understanding how β-sheets adsorb onto lipid/aqueous interfaces is challenging. Here, we combine chiral sum frequency generation (SFG) spectroscopy and ab initio quantum chemistry calculations based on a divide-and-conquer strategy to characterize the orientation of human islet amyloid polypeptides (hIAPPs) at lipid/aqueous interfaces. We show that the aggregates bind with β-strands oriented at 48° relative to the interface. This orientation reflects the amphiphilic properties of hIAPP β-sheet aggregates and suggests the potential disruptive effect on membrane integrity.
Collapse
|
19
|
Fu L, Wang Z, Yan EC. Chiral vibrational structures of proteins at interfaces probed by sum frequency generation spectroscopy. Int J Mol Sci 2011; 12:9404-25. [PMID: 22272140 PMCID: PMC3257137 DOI: 10.3390/ijms12129404] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2011] [Revised: 12/13/2011] [Accepted: 12/13/2011] [Indexed: 12/04/2022] Open
Abstract
We review the recent development of chiral sum frequency generation (SFG) spectroscopy and its applications to study chiral vibrational structures at interfaces. This review summarizes observations of chiral SFG signals from various molecular systems and describes the molecular origins of chiral SFG response. It focuses on the chiral vibrational structures of proteins and presents the chiral SFG spectra of proteins at interfaces in the C-H stretch, amide I, and N-H stretch regions. In particular, a combination of chiral amide I and N-H stretches of the peptide backbone provides highly characteristic vibrational signatures, unique to various secondary structures, which demonstrate the capacity of chiral SFG spectroscopy to distinguish protein secondary structures at interfaces. On the basis of these recent developments, we further discuss the advantages of chiral SFG spectroscopy and its potential application in various fields of science and technology. We conclude that chiral SFG spectroscopy can be a new approach to probe chiral vibrational structures of protein at interfaces, providing structural and dynamic information to study in situ and in real time protein structures and dynamics at interfaces.
Collapse
Affiliation(s)
- Li Fu
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, CT, 06520, USA; E-Mails: (L.F.); (Z.W.)
| | - Zhuguang Wang
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, CT, 06520, USA; E-Mails: (L.F.); (Z.W.)
| | - Elsa C.Y. Yan
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, CT, 06520, USA; E-Mails: (L.F.); (Z.W.)
| |
Collapse
|
20
|
Discriminating early stage A{beta}42 monomer structures using chirality-induced 2DIR spectroscopy in a simulation study. Proc Natl Acad Sci U S A 2010; 107:15687-92. [PMID: 20798063 DOI: 10.1073/pnas.1002131107] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Elucidating the structural features of the Abeta monomer, the peptide constituent of amyloid fibrils found in Alzheimer's disease, can enable a direct characterization of aggregation pathways. Recent studies support the view that the ensemble of Abeta42 monomers is a mixture of diverse ordered and disordered conformational species, which can be classified according to the formation of a characteristic beta-hairpin conformation in a certain region. Despite the disparity in the structural features of these species, commonly used spectroscopic techniques such as NMR may not directly trace the conformational dynamics in the ensemble due to the limited time resolution and the lack of well-resolved spectral features for different comformers. Here we use molecular dynamics simulations combined with simulations of two-dimensional IR (2DIR) spectra to investigate the structure of these species, their interchange kinetics, and their spectral features. We show that while the discrimination efficiency of the ordinary, nonchiral 2DIR signal is limited due to its intrinsic dependence on common order parameters that are dominated by the generally unstructured part of the sequence, signals with carefully designed chirality-sensitive pulse configurations have the high resolution required for differentiating the various monomer structures. Our combined simulation studies indicate the power of the chirality-induced (CI) 2DIR technique in investigating early events in Abeta42 aggregation and open the possibility for their use as a novel experimental tool.
Collapse
|