1
|
Zheng X, Ni Z, Pei Q, Wang M, Tan J, Bai S, Shi F, Ye S. Probing the Molecular Structure and Dynamics of Membrane-Bound Proteins during Misfolding Processes by Sum-Frequency Generation Vibrational Spectroscopy. Chempluschem 2024; 89:e202300684. [PMID: 38380553 DOI: 10.1002/cplu.202300684] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2023] [Revised: 02/17/2024] [Accepted: 02/20/2024] [Indexed: 02/22/2024]
Abstract
Protein misfolding and amyloid formation are implicated in the protein dysfunction, but the underlying mechanism remains to be clarified due to the lack of effective tools for detecting the transient intermediates. Sum frequency generation vibrational spectroscopy (SFG-VS) has emerged as a powerful tool for identifying the structure and dynamics of proteins at the interfaces. In this review, we summarize recent SFG-VS studies on the structure and dynamics of membrane-bound proteins during misfolding processes. This paper first introduces the methods for determining the secondary structure of interfacial proteins: combining chiral and achiral spectra of amide A and amide I bands and combining amide I, amide II, and amide III spectral features. To demonstrate the ability of SFG-VS in investigating the interfacial protein misfolding and amyloid formation, studies on the interactions between different peptides/proteins (islet amyloid polypeptide, amyloid β, prion protein, fused in sarcoma protein, hen egg-white lysozyme, fusing fusion peptide, class I hydrophobin SC3 and class II hydrophobin HFBI) and surfaces such as lipid membranes are discussed. These molecular-level studies revealed that SFG-VS can provide a unique understanding of the mechanism of interfacial protein misfolding and amyloid formation in real time, in situ and without any exogenous labeling.
Collapse
Affiliation(s)
- Xiaoxuan Zheng
- Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui, 230026, China
| | - Zijian Ni
- Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui, 230026, China
| | - Quanbing Pei
- Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui, 230026, China
| | - Mengmeng Wang
- Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui, 230026, China
| | - Junjun Tan
- Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui, 230026, China
| | - Shiyu Bai
- Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui, 230026, China
| | - Fangwen Shi
- Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui, 230026, China
| | - Shuji Ye
- Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui, 230026, China
| |
Collapse
|
2
|
Qi D, Lukić MJ, Lu H, Gebauer D, Bonn M. Role of Water during the Early Stages of Iron Oxyhydroxide Formation by a Bacterial Iron Nucleator. J Phys Chem Lett 2024; 15:1048-1055. [PMID: 38253017 DOI: 10.1021/acs.jpclett.3c03327] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2024]
Abstract
Understanding the nucleation of iron oxides and the underlying hydrolysis of aqueous iron species is still challenging, and molecular-level insights into the orchestrated response of water, especially at the hydrolysis interface, are lacking. We follow iron(III) hydrolysis in the presence of a synthetic bacterial iron nucleator, which is a magnetosome membrane specific peptide, by using a constant pH titration technique. Three distinct hydrolysis regimes were identified. Interface-selective sum frequency generation (SFG) spectroscopy was used to probe the interfacial reaction and water in direct contact with the peptide. SFG data reveal that iron(III) species react quickly with interfacial peptides while continuously enhancing water alignment into the later stages of hydrolysis. The gradually aligning water molecules are associated with initially promoted (regimes I and II) and later suppressed (regime III) hydrolysis after the saturation of water alignment has occurred until regime II. These interfacial insights are crucial for understanding the early stage of iron oxide biomineralization.
Collapse
Affiliation(s)
- Daizong Qi
- Department of Materials and Textile Engineering, Nanotechnology Research Institute, Jiaxing University, Building No. 7, Jiaxing Intelligent Industry & Innovation Park, Jiaxing, Zhejiang 314001, P. R. China
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Miodrag J Lukić
- Institute of Inorganic Chemistry, Leibniz University Hannover, Callinstrasse 9, 30167 Hannover, Germany
| | - Hao Lu
- Department of Materials and Textile Engineering, Nanotechnology Research Institute, Jiaxing University, Building No. 7, Jiaxing Intelligent Industry & Innovation Park, Jiaxing, Zhejiang 314001, P. R. China
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Denis Gebauer
- Institute of Inorganic Chemistry, Leibniz University Hannover, Callinstrasse 9, 30167 Hannover, Germany
| | - Mischa Bonn
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| |
Collapse
|
3
|
Yang P, Guo W, Ramamoorthy A, Chen Z. Conformation and Orientation of Antimicrobial Peptides MSI-594 and MSI-594A in a Lipid Membrane. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:5352-5363. [PMID: 37017985 DOI: 10.1021/acs.langmuir.2c03430] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
There is significant interest in the development of antimicrobial compounds to overcome the increasing bacterial resistance to conventional antibiotics. Studies have shown that naturally occurring and de novo-designed antimicrobial peptides could be promising candidates. MSI-594 is a synthetic linear, cationic peptide that has been reported to exhibit a broad spectrum of antimicrobial activities. Investigation into how MSI-594 disrupts the cell membrane is important for better understanding the details of this antimicrobial peptide (AMP)'s action against bacterial cells. In this study, we used two different synthetic lipid bilayers: zwitterionic 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC) and anionic 7:3 POPC/1-palmitoyl-2-oleoyl-sn-glycero-3-phospho(1'-rac-glycerol) (POPG). Sum frequency generation (SFG) vibrational spectroscopy and attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR) were used to determine the orientations of MSI-594 and its analogue MSI-594A associated with zwitterionic POPC and anionic 7:3 POPC/POPG lipid bilayers. The simulated ATR-FTIR and SFG spectra using nuclear magnetic resonance (NMR)-determined structures were compared with experimental spectra to optimize the bent angle between the N- (1-11) and C- (12-24) termini helices and the membrane orientations of the helices; since the NMR structure of the peptide was determined from lipopolysaccharide (LPS) micelles, the optimization was needed to find the most suitable conformation and orientation in lipid bilayers. The reported experimental results indicate that the optimized MSI-594 helical hairpin structure adopts a complete lipid bilayer surface-bound orientation (denoted "face-on") in both POPC and 7:3 POPC/POPG lipid bilayers. The analogue peptide, MSI-584A, on the other hand, exhibited a larger bent angle between the N- (1-11) and C- (12-24) termini helices with the hydrophobic C-terminal helix inserted into the hydrophobic region of the bilayer (denoted "membrane-inserted") when interacting with both POPC and 7:3 POPC/POPG lipid bilayers. These experimental findings on the membrane orientations suggest that both peptides are likely to disrupt the cell membrane through the carpet mechanism.
Collapse
Affiliation(s)
- Pei Yang
- Department of Chemistry, The University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109-1055, United States
| | - Wen Guo
- Department of Chemistry, The University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109-1055, United States
| | - Ayyalusamy Ramamoorthy
- Department of Chemistry, The University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109-1055, United States
- Department of Biophysics, The University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109-1055, United States
| | - Zhan Chen
- Department of Chemistry, The University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109-1055, United States
- Department of Biophysics, The University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109-1055, United States
| |
Collapse
|
4
|
Lu T, Chen Z. Monitoring the Molecular Structure of Fibrinogen during the Adsorption Process at the Buried Silicone Oil Interface In Situ in Real Time. J Phys Chem Lett 2023; 14:3139-3145. [PMID: 36961304 DOI: 10.1021/acs.jpclett.3c00331] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Interfacial proteins play important roles in many research fields and applications, such as biosensors, biomedical implants, nonfouling coatings, etc. Directly probing interfacial protein behavior at buried solid/liquid and liquid/liquid interfaces is challenging. We used sum frequency generation vibrational spectroscopy and a Hamiltonian data analysis method to monitor the molecular structure of fibrinogen on silicone oil during the adsorption process in situ in real time. The results showed that the adsorbed fibrinogen molecules tend to adopt a bent structure throughout the entire adsorption process with the same orientation. This is different from the case of adsorbed fibrinogen on CaF2 with a linear structure or on polystyrene with a bent structure but a different orientation. The method introduced herein is generally applicable for following time-dependent molecular structures of many other proteins and peptides at interfaces in situ in real time at the molecular level.
Collapse
Affiliation(s)
- Tieyi Lu
- Department of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, United States
| | - Zhan Chen
- Department of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, United States
| |
Collapse
|
5
|
Guo W, Lu T, Crisci R, Nagao S, Wei T, Chen Z. Determination of protein conformation and orientation at buried solid/liquid interfaces. Chem Sci 2023; 14:2999-3009. [PMID: 36937592 PMCID: PMC10016606 DOI: 10.1039/d2sc06958j] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2022] [Accepted: 02/09/2023] [Indexed: 02/16/2023] Open
Abstract
Protein structures at solid/liquid interfaces mediate interfacial protein functions, which are important for many applications. It is difficult to probe interfacial protein structures at buried solid/liquid interfaces in situ at the molecular level. Here, a systematic methodology to determine protein molecular structures (orientation and conformation) at buried solid/liquid interfaces in situ was successfully developed with a combined approach using a nonlinear optical spectroscopic technique - sum frequency generation (SFG) vibrational spectroscopy, isotope labeling, spectra calculation, and computer simulation. With this approach, molecular structures of protein GB1 and its mutant (with two amino acids mutated) were investigated at the polymer/solution interface. Markedly different orientations and similar (but not identical) conformations of the wild-type protein GB1 and its mutant at the interface were detected, due to the varied molecular interfacial interactions. This systematic strategy is general and can be widely used to elucidate protein structures at buried interfaces in situ.
Collapse
Affiliation(s)
- Wen Guo
- Department of Chemistry, University of Michigan 930 North University Avenue Ann Arbor 48109 Michigan USA
| | - Tieyi Lu
- Department of Chemistry, University of Michigan 930 North University Avenue Ann Arbor 48109 Michigan USA
| | - Ralph Crisci
- Department of Chemistry, University of Michigan 930 North University Avenue Ann Arbor 48109 Michigan USA
| | - Satoshi Nagao
- Graduate School of Science, University of Hyogo 3-2-1 Koto, Ako-gun Kamigouri-cho Hyogo 678-1297 Japan
| | - Tao Wei
- Department of Chemical Engineering, Howard University 2366 Sixth Street NW Washington 20059 DC USA
| | - Zhan Chen
- Department of Chemistry, University of Michigan 930 North University Avenue Ann Arbor 48109 Michigan USA
| |
Collapse
|
6
|
Macdonald B, Zhang C, Chen Z, Tuteja A. Polysiloxane-Based Liquid-like Layers for Reducing Polymer and Wax Fouling. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:274-284. [PMID: 36583570 DOI: 10.1021/acs.langmuir.2c02489] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Surface fouling occurs when undesired matter adheres and accumulates on a surface, resulting in a decrease or loss of functionality. Polymer and wax fouling can cause costly blockages to crude oil pipelines, clog jet fuel injectors, foul chemical reaction vessels, and significantly decrease the efficiency of heat exchangers. Fouling occurs in many forms but can be segmented based on adherent size, modulus, and chemical functionality. Depending on the foulant, surface design strategies can vary greatly. Few strategies exist to prevent the buildup of wax and polymers on surfaces. In this report, we investigate the potential of highly disordered, siloxane liquid-like layers as a strategy for reducing wax and polymer deposition. In our tests, it was found that the liquid-like layers developed here were able to reduce postadsorption roughness for polymer and wax by as much as 35- and 47-fold, respectively, when compared to the control. SFG was utilized to investigate the molecular-level interfacial properties for each of the modified surfaces to help understand the antifouling mechanism. The data showed that the likely higher grafting density and a large degree of random conformational freedom at the liquid-surface interface make the developed siloxane-covered surfaces energetically unfavorable for polymer and wax accretion.
Collapse
Affiliation(s)
- Brian Macdonald
- Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States
- Biointerfaces Institute, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Chengcheng Zhang
- Department of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, United States
| | - Zhan Chen
- Department of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, United States
| | - Anish Tuteja
- Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States
- Biointerfaces Institute, University of Michigan, Ann Arbor, Michigan 48109, United States
- Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States
- Department of Macromolecular Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States
| |
Collapse
|
7
|
Lu T, Fu L, Qiu Y, Zhang J, Chen Z. Probing Molecular Interactions of Antibody Drugs, Silicone Oil, and Surfactant at Buried Interfaces In Situ. Anal Chem 2022; 94:14761-14768. [PMID: 36215703 DOI: 10.1021/acs.analchem.2c03425] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Antibody drugs have been rapidly developed to cure many diseases including COVID-19 infection. Silicone oil is commonly used as a lubricant coating material for devices used in the pharmaceutical industry to store and administer antibody drug formulations. However, the interaction between silicone oil and antibody molecules could lead to the adsorption, denaturation, and aggregation of antibody molecules, impacting the efficacy of antibody drugs. Here, we studied the molecular interactions between antibodies and silicone oil in situ in real time. The effect of the surfactant on such interactions was also investigated. Specifically, the adsorption dynamics of a bispecific antibody (BsAb) onto a silicone oil surface without and with different concentrations of the surfactant PS80 in antibody solutions were monitored. Also the possible lowest effective PS80 concentrations that can prevent the adsorption of BsAb as well as a monoclonal antibody (mAb) onto silicone oil were measured. It was found that different concentrations of PS80 are required for preventing the adsorption of different antibodies. Both BsAB and mAB denature on silicone oil without a surfactant. However, for a low surfactant concentration in the solution, although the surfactant could not completely prevent the antibody from adsorption, it could maintain the native structures of adsorbed BsAb and mAb antibodies on silicone oil. This is important knowledge, showing that to prevent antibody aggregation on silicone oil it is not necessary to add surfactant to a concentration high enough to completely minimize protein adsorption.
Collapse
Affiliation(s)
- Tieyi Lu
- Department of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, United States
| | - Li Fu
- Sanofi, 1 The Mountain Road, Framingham, Massachusetts 01701, United States
| | - Yu Qiu
- Sanofi, 350 Water St, Cambridge, Massachusetts 02141, United States
| | - Jifeng Zhang
- Sanofi, 1 The Mountain Road, Framingham, Massachusetts 01701, United States
| | - Zhan Chen
- Department of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, United States
| |
Collapse
|
8
|
Correira JM, Handali PR, Webb LJ. Characterizing Protein-Surface and Protein-Nanoparticle Conjugates: Activity, Binding, and Structure. J Chem Phys 2022; 157:090902. [DOI: 10.1063/5.0101406] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Many sensors and catalysts composed of proteins immobilized on inorganic materials have been reported over the past few decades. Despite some examples of functional protein-surface and protein-nanoparticle conjugates, thorough characterization of the biological-abiological interface at the heart of these materials and devices is often overlooked in lieu of demonstrating acceptable system performance. This has resulted in a focus on generating functioning protein-based devices without a concerted effort to develop reliable tools necessary to measure the fundamental properties of the bio-abio interface such as surface concentration, biomolecular structure, and activity. In this Perspective we discuss current methods used to characterize these critical properties of devices that operate by integrating a protein into both flat surfaces and nanoparticle materials. We highlight the advantages and drawbacks of each method as they relate to understanding the function of the protein-surface interface, and explore the manner in which an informed understanding of this complex interaction leads directly to the advancement of protein-based materials and technology.
Collapse
Affiliation(s)
| | - Paul R Handali
- The University of Texas at Austin, United States of America
| | - Lauren J. Webb
- Chemistry, The University of Texas at Austin Department of Chemistry, United States of America
| |
Collapse
|
9
|
Lu H, Bellucci L, Sun S, Qi D, Rosa M, Berger R, Corni S, Bonn M. Acidic pH Promotes Refolding and Macroscopic Assembly of Amyloid β (16-22) Peptides at the Air-Water Interface. J Phys Chem Lett 2022; 13:6674-6679. [PMID: 35839425 PMCID: PMC9340808 DOI: 10.1021/acs.jpclett.2c01171] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2022] [Accepted: 07/12/2022] [Indexed: 05/31/2023]
Abstract
Assembly by amyloid-beta (Aβ) peptides is vital for various neurodegenerative diseases. The process can be accelerated by hydrophobic interfaces such as the cell membrane interface and the air-water interface. Elucidating the assembly mechanism for Aβ peptides at hydrophobic interface requires knowledge of the microscopic structure of interfacial peptides. Here we combine scanning force microscopy, sum-frequency generation spectroscopy, and metadynamics simulations to probe the structure of the central fragment of Aβ peptides at the air-water interface. We find that the structure of interfacial peptides depends on pH: at neutral pH, the peptides adopt a less folded, bending motif by forming intra-hydrogen bonds; at acidic pH, the peptides refold into extended β-strand fibril conformation, which further promotes their macroscopic assembly. The conformational transition of interfacial peptides is driven by the reduced hydrogen bonds, both with water and within peptides, resulting from the protonation of acidic glutamic acid side chains.
Collapse
Affiliation(s)
- Hao Lu
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Luca Bellucci
- NEST
− Istituto di Nanoscienze del Consiglio Nazionale delle Ricerche
CNR-NANO and Scuola Normale Superiore, Piazza S. Silvestro 12, Pisa, 56127, Italy
| | - Shumei Sun
- Department
of Physics and Applied Optics Beijing Area Major Laboratory, Beijing Normal University, Beijing, 100875, China
| | - Daizong Qi
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Marta Rosa
- Istituto
di Nanoscienze del Consiglio Nazionale delle Ricerche CNR-NANO, 41125 Modena, Italy
- Dipartimento
di Scienze Chimiche, Università di
Padova, 35131 Padova, Italy
| | - Rüdiger Berger
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Stefano Corni
- Istituto
di Nanoscienze del Consiglio Nazionale delle Ricerche CNR-NANO, 41125 Modena, Italy
- Dipartimento
di Scienze Chimiche, Università di
Padova, 35131 Padova, Italy
| | - Mischa Bonn
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| |
Collapse
|
10
|
Early sum frequency generation vibrational spectroscopic studies on peptides and proteins at interfaces. Biointerphases 2022; 17:031202. [PMID: 35525602 DOI: 10.1116/6.0001859] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
This paper summarizes the early research results on studying proteins and peptides at interfaces using sum frequency generation (SFG) vibrational spectroscopy. SFG studies in the C-H stretching frequency region to examine the protein side-chain behavior and in the amide I frequency region to investigate the orientation and conformation of interfacial peptides/proteins are presented. The early chiral SFG research and SFG isotope labeling studies on interfacial peptides/proteins are also discussed. These early SFG studies demonstrate the feasibility of using SFG to elucidate interfacial molecular structures of peptides and proteins in situ, which built a foundation for later SFG investigations on peptides and proteins at interfaces.
Collapse
|
11
|
Ren H, Zhang Q, Wang Z, Zhang G, Liu H, Guo W, Mukamel S, Jiang J. Machine learning recognition of protein secondary structures based on two-dimensional spectroscopic descriptors. Proc Natl Acad Sci U S A 2022; 119:e2202713119. [PMID: 35476517 PMCID: PMC9171355 DOI: 10.1073/pnas.2202713119] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2022] [Accepted: 03/28/2022] [Indexed: 11/29/2022] Open
Abstract
Protein secondary structure discrimination is crucial for understanding their biological function. It is not generally possible to invert spectroscopic data to yield the structure. We present a machine learning protocol which uses two-dimensional UV (2DUV) spectra as pattern recognition descriptors, aiming at automated protein secondary structure determination from spectroscopic features. Accurate secondary structure recognition is obtained for homologous (97%) and nonhomologous (91%) protein segments, randomly selected from simulated model datasets. The advantage of 2DUV descriptors over one-dimensional linear absorption and circular dichroism spectra lies in the cross-peak information that reflects interactions between local regions of the protein. Thanks to their ultrafast (∼200 fs) nature, 2DUV measurements can be used in the future to probe conformational variations in the course of protein dynamics.
Collapse
Affiliation(s)
- Hao Ren
- School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao 266580, Shandong, China
| | - Qian Zhang
- School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao 266580, Shandong, China
| | - Zhengjie Wang
- School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao 266580, Shandong, China
| | - Guozhen Zhang
- School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, Anhui, China
| | - Hongzhang Liu
- School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao 266580, Shandong, China
| | - Wenyue Guo
- School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao 266580, Shandong, China
| | - Shaul Mukamel
- Department of Chemistry and Physics & Astronomy, University of California, Irvine, CA 92697
| | - Jun Jiang
- School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, Anhui, China
| |
Collapse
|
12
|
Zhang R, Cross TA, Peng X, Fu R. Surprising Rigidity of Functionally Important Water Molecules Buried in the Lipid Headgroup Region. J Am Chem Soc 2022; 144:7881-7888. [PMID: 35439409 PMCID: PMC9165019 DOI: 10.1021/jacs.2c02145] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Understanding water dynamics and structure is an important topic in biological systems. It is generally held in the literature that the interfacial water of hydrated phospholipids is highly mobile, in fast exchange with the bulk water ranging from the nano- to femtosecond timescale. Although nuclear magnetic resonance (NMR) is a powerful tool for structural and dynamic studies, direct probing of interfacial water in hydrated phospholipids is formidably challenging due to the extreme population difference between bulk and interfacial water. We developed a novel 17O solid-state NMR technique in combination with an ultra-high-field magnet (35.2 T) to directly probe the functionally important interfacial water. By selectively suppressing the dominant bulk water signal, we observed two distinct water species in the headgroup region of hydrated dimyristoylphosphatidylcholine (DMPC) lipid bilayers for the first time. One water species denoted as "confined water" is chemically and dynamically different from the bulk water (∼0.17 ppm downfield and a slightly shorter spin-lattice relaxation time). Another water species denoted as "bound water" has severely restricted motion and a distinct chemical shift (∼12 ppm upfield). Additionally, the bulk water is not as "free" as pure water, resulting from the fast exchange with the water molecules that weakly and transiently interact with the lipid choline groups. These new discoveries clearly indicate the existence of the interfacial water molecules that are relatively stable over the NMR timescale (on the order of milliseconds), providing an opportunity to characterize water dynamics on the millisecond or slower timescale in biomacromolecules.
Collapse
Affiliation(s)
- Rongfu Zhang
- National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, United States.,Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32301, United States
| | - Timothy A Cross
- National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, United States.,Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32301, United States
| | - Xinhua Peng
- CAS Key Laboratory of Microscale Magnetic Resonance and Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China
| | - Riqiang Fu
- National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, United States
| |
Collapse
|
13
|
Lu T, Guo W, Datar PM, Xin Y, Marsh ENG, Chen Z. Probing protein aggregation at buried interfaces: distinguishing between adsorbed protein monomers, dimers, and a monomer-dimer mixture in situ. Chem Sci 2022; 13:975-984. [PMID: 35211262 PMCID: PMC8790787 DOI: 10.1039/d1sc04300e] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Accepted: 12/04/2021] [Indexed: 11/21/2022] Open
Abstract
Protein adsorption on surfaces greatly impacts many applications such as biomedical materials, anti-biofouling coatings, bio-separation membranes, biosensors, antibody protein drugs etc. For example, protein drug adsorption on the widely used lubricant silicone oil surface may induce protein aggregation and thus affect the protein drug efficacy. It is therefore important to investigate the molecular behavior of proteins at the silicone oil/solution interface. Such an interfacial study is challenging because the targeted interface is buried. By using sum frequency generation vibrational spectroscopy (SFG) with Hamiltonian local mode approximation method analysis, we studied protein adsorption at the silicone oil/protein solution interface in situ in real time, using bovine serum albumin (BSA) as a model. The results showed that the interface was mainly covered by BSA dimers. The deduced BSA dimer orientation on the silicone oil surface from the SFG study can be explained by the surface distribution of certain amino acids. To confirm the BSA dimer adsorption, we treated adsorbed BSA dimer molecules with dithiothreitol (DTT) to dissociate these dimers. SFG studies on adsorbed BSA after the DTT treatment indicated that the silicone oil surface is covered by BSA dimers and BSA monomers in an approximate 6 : 4 ratio. That is to say, about 25% of the adsorbed BSA dimers were converted to monomers after the DTT treatment. Extensive research has been reported in the literature to determine adsorbed protein dimer formation using ex situ experiments, e.g., by washing off the adsorbed proteins from the surface then analyzing the washed-off proteins, which may induce substantial errors in the washing process. Dimerization is a crucial initial step for protein aggregation. This research developed a new methodology to investigate protein aggregation at a solid/liquid (or liquid/liquid) interface in situ in real time using BSA dimer as an example, which will greatly impact many research fields and applications involving interfacial biological molecules.
Collapse
Affiliation(s)
- Tieyi Lu
- Department of Chemistry, University of Michigan Ann Arbor Michigan 48109 USA
| | - Wen Guo
- Department of Chemistry, University of Michigan Ann Arbor Michigan 48109 USA
| | - Prathamesh M Datar
- Department of Chemistry, University of Michigan Ann Arbor Michigan 48109 USA
| | - Yue Xin
- Department of Chemistry, University of Michigan Ann Arbor Michigan 48109 USA
| | - E Neil G Marsh
- Department of Chemistry, University of Michigan Ann Arbor Michigan 48109 USA
| | - Zhan Chen
- Department of Chemistry, University of Michigan Ann Arbor Michigan 48109 USA
| |
Collapse
|
14
|
Joshi P, Mallepogu P, Kaur H, Singh R, Sodhi I, Samal SK, Jena KC, Sangamwar AT. Explicating the molecular level drug-polymer interactions at the interface of supersaturated solution of the model drug: Albendazole. Eur J Pharm Sci 2021; 167:106014. [PMID: 34644598 DOI: 10.1016/j.ejps.2021.106014] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2021] [Revised: 09/10/2021] [Accepted: 09/16/2021] [Indexed: 11/16/2022]
Abstract
Supersaturation as a formulation principle relates to the aqueous solubility of poorly soluble drugs in solution . However, supersaturation state of drugs tends to crystallize because of its thermodynamic instability thereby compromising the solubility and biopharmaceutical performance of drugs. The present study aims to investigate the supersaturation potential of albendazole (ABZ) and its precipitation via nucleation and crystal growth. We hypothesized the use of polymers will avoid ABZ precipitation by interacting with drug molecules. The drug polymer interactions are characterized using conventional methods of Fourier transform infrared (FTIR), Nuclear magnetic resonance (NMR) and Polarized light microscopy (PLM). We have used a novel approach of sum frequency generation (SFG) vibrational spectroscopic in exploring the drug polymer interactions at air-water interface. Recently we have reported the SFG for e rifaximin-polymer interactions (Singh et al., 2021). The supersaturation assay, saturation solubility studies and nucleation induction time analysis revealed polyvinyl alcohol (PVA) and polyvinyl pyrrolidone (PVP K30) as effective precipitation inhibitors thereby enhancing the ABZ equilibrium solubility and in vitro supersaturation maintenance of ABZ. Further, modification in the solid state of ABZ has confirmed the influence of polymers on its precipitation behaviour. We conclude that PVA and PVP K30 act as nucleation and crystal growth inhibitor, respectively for the precipitation inhibition of ABZ.
Collapse
Affiliation(s)
- Prachi Joshi
- Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Sahibzada Ajit Singh Nagar, Punjab 160062, India
| | - Prabhakar Mallepogu
- Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Sahibzada Ajit Singh Nagar, Punjab 160062, India
| | - Harpreet Kaur
- Department of Physics, Indian Institute of Technology, Ropar, Rupnagar, Punjab 140001, India
| | - Ridhima Singh
- Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Sahibzada Ajit Singh Nagar, Punjab 160062, India
| | - Ikjot Sodhi
- Formulation Development, Fresenius Kabi Oncology Ltd., Gurgaon, Haryana 122001, India
| | - Sanjaya K Samal
- Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Sahibzada Ajit Singh Nagar, Punjab 160062, India
| | - Kailash C Jena
- Department of Physics, Indian Institute of Technology, Ropar, Rupnagar, Punjab 140001, India; Center for Biomedical Engineering, Indian Institute of Technology Ropar, Rupnagar, Punjab 140001, India
| | - Abhay T Sangamwar
- Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Sahibzada Ajit Singh Nagar, Punjab 160062, India.
| |
Collapse
|
15
|
Guo W, Lu T, Gandhi Z, Chen Z. Probing Orientations and Conformations of Peptides and Proteins at Buried Interfaces. J Phys Chem Lett 2021; 12:10144-10155. [PMID: 34637311 DOI: 10.1021/acs.jpclett.1c02956] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Molecular structures of peptides/proteins at interfaces determine their interfacial properties, which play important roles in many applications. It is difficult to probe interfacial peptide/protein structures because of the lack of appropriate tools. Sum frequency generation (SFG) vibrational spectroscopy has been developed into a powerful technique to elucidate molecular structures of peptides/proteins at buried solid/liquid and liquid/liquid interfaces. SFG has been successfully applied to study molecular interactions between model cell membranes and antimicrobial peptides/membrane proteins, surface-immobilized peptides/enzymes, and physically adsorbed peptides/proteins on polymers and 2D materials. A variety of other analytical techniques and computational simulations provide supporting information to SFG studies, leading to more complete understanding of structure-function relationships of interfacial peptides/proteins. With the advance of SFG techniques and data analysis methods, along with newly developed supplemental tools and simulation methodology, SFG research on interfacial peptides/proteins will further impact research in fields like chemistry, biology, biophysics, engineering, and beyond.
Collapse
Affiliation(s)
- Wen Guo
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Tieyi Lu
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Zahra Gandhi
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Zhan Chen
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| |
Collapse
|
16
|
Hoinkis N, Lutz H, Lu H, Golbek TW, Bregnhøj M, Jakob G, Bonn M, Weidner T. Assembly of iron oxide nanosheets at the air-water interface by leucine-histidine peptides. RSC Adv 2021; 11:27965-27968. [PMID: 35480727 PMCID: PMC9038006 DOI: 10.1039/d1ra04733g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2021] [Accepted: 08/06/2021] [Indexed: 11/21/2022] Open
Abstract
The fabrication of inorganic nanomaterials is important for a wide range of disciplines. While many purely inorganic synthetic routes have enabled a manifold of nanostructures under well-controlled conditions, organisms have the ability to synthesize structures under ambient conditions. For example, magnetotactic bacteria, can synthesize tiny 'compass needles' of magnetite (Fe3O4). Here, we demonstrate the bio-inspired synthesis of extended, self-supporting, nanometer-thin sheets of iron oxide at the water-air interface through self-assembly using small histidine-rich peptides.
Collapse
Affiliation(s)
- Nina Hoinkis
- Max Planck Institute for Polymer Research Ackermannweg 10 55128 Mainz Germany
| | - Helmut Lutz
- Max Planck Institute for Polymer Research Ackermannweg 10 55128 Mainz Germany
| | - Hao Lu
- Max Planck Institute for Polymer Research Ackermannweg 10 55128 Mainz Germany
| | - Thaddeus W Golbek
- Department of Chemistry, Aarhus University Langelandsgade 140 8000 Aarhus C Denmark
| | - Mikkel Bregnhøj
- Department of Chemistry, Aarhus University Langelandsgade 140 8000 Aarhus C Denmark
| | - Gerhard Jakob
- University of Mainz, Institute of Physics Staudinger Weg 7 55128 Mainz Germany
| | - Mischa Bonn
- Max Planck Institute for Polymer Research Ackermannweg 10 55128 Mainz Germany
| | - Tobias Weidner
- Department of Chemistry, Aarhus University Langelandsgade 140 8000 Aarhus C Denmark
| |
Collapse
|
17
|
Lu H, Ng DYW, Lieberwirth I, Weidner T, Bonn M. Intrinsically Disordered Osteopontin Fragment Orders During Interfacial Calcium Oxalate Mineralization. Angew Chem Int Ed Engl 2021; 60:18577-18581. [PMID: 34118104 PMCID: PMC8457088 DOI: 10.1002/anie.202105768] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2021] [Revised: 05/19/2021] [Indexed: 11/11/2022]
Abstract
Calcium oxalate (CaC2 O4 ) is the major component of kidney stone. The acidic osteopontin (OPN) protein in human urine can effectively inhibit the growth of CaC2 O4 crystals, thereby acting as a potent stone preventer. Previous studies in bulk solution all attest to the importance of binding and recognition of OPN at the CaC2 O4 mineral surface, yet molecular level insights into the active interface during CaC2 O4 mineralization are still lacking. Here, we probe the structure of the central OPN fragment and its interaction with Ca2+ and CaC2 O4 at the water-air interface using surface-specific non-linear vibrational spectroscopy. While OPN peptides remain largely disordered in solution, our results reveal that the bidentate binding of Ca2+ ions refold the interfacial peptides into well-ordered and assembled β-turn motifs. One critical intermediate directs mineralization by releasing structural freedom of backbone and binding side chains. These insights into the mineral interface are crucial for understanding the pathological development of kidney stones and possibly relevant for calcium oxalate biomineralization in general.
Collapse
Affiliation(s)
- Hao Lu
- Department of Molecular SpectroscopyMax Planck Institute for Polymer ResearchAckermannweg 1055128MainzGermany
| | - David Yuen Wah Ng
- Department of Molecular SpectroscopyMax Planck Institute for Polymer ResearchAckermannweg 1055128MainzGermany
| | - Ingo Lieberwirth
- Department of Molecular SpectroscopyMax Planck Institute for Polymer ResearchAckermannweg 1055128MainzGermany
| | - Tobias Weidner
- Department of ChemistryAarhus UniversityLangelandsgade 1408000Aarhus CDenmark
| | - Mischa Bonn
- Department of Molecular SpectroscopyMax Planck Institute for Polymer ResearchAckermannweg 1055128MainzGermany
| |
Collapse
|
18
|
Lu H, Ng DYW, Lieberwirth I, Weidner T, Bonn M. Intrinsisch ungeordnete Osteopontin‐Fragmente ordnen sich während der interfazialen Calciumoxalat‐Mineralisierung. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202105768] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Hao Lu
- Abteilung für Molekülspektroskopie Max-Planck-Institut für Polymerforschung Ackermannweg 10 55128 Mainz Deutschland
| | - David Yuen Wah Ng
- Abteilung für Molekülspektroskopie Max-Planck-Institut für Polymerforschung Ackermannweg 10 55128 Mainz Deutschland
| | - Ingo Lieberwirth
- Abteilung für Molekülspektroskopie Max-Planck-Institut für Polymerforschung Ackermannweg 10 55128 Mainz Deutschland
| | - Tobias Weidner
- Fakultät für Chemie Universität Aarhus Langelandsgade 140 8000 Aarhus C Dänemark
| | - Mischa Bonn
- Abteilung für Molekülspektroskopie Max-Planck-Institut für Polymerforschung Ackermannweg 10 55128 Mainz Deutschland
| |
Collapse
|
19
|
Zhang C, Gao J, Hankett J, Varanasi P, Kerobo CO, Zhao S, Chen Z. Interfacial Structure and Interfacial Tension in Model Carbon Fiber-Reinforced Polymers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:5311-5320. [PMID: 33880927 DOI: 10.1021/acs.langmuir.1c00403] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Carbon fiber-reinforced plastics (CFRPs) are widely used materials with outstanding mechanical properties. The wettability between the polymer matrix and carbon fiber in the interphase region significantly influences the strength of the composite. Sizing agents consisting of multiple components are therefore frequently applied to improve wetting and interfacial adhesion between polymers and carbon fiber in CFRPs. However, the complex compositions of sizing solutions make detailed interpretations of their impacts on interfacial wetting difficult. In this work, surface-sensitive sum frequency generation (SFG) spectroscopy was utilized to characterize the sizing/polymer and sizing/carbon fiber interfacial structures to gain molecular-level understandings of the wetting improvements afforded by sizing. A mixture sizing solution containing polyethylenimine (PEI, adhesion promoter) and Lutensol (surfactant) was investigated when contacting nylon (model plastics), polypropylene (model plastics), and graphite (model carbon fiber). Our results demonstrated that although the addition of the surfactant led to an interfacial tension decrease (in comparison to pure PEI solution) on nylon and polypropylene, the interfacial tension was surprisingly increased on graphite, contrasting with the commonly accepted function of surfactants. SFG characterizations revealed the multilayer molecular structures at these buried interfaces. The peculiar interfacial tension increase at the graphite/sizing interface was then correlated to the strong amine-π interactions between PEI and graphite. PEI was therefore demonstrated to be an effective adhesion promoter for carbon fiber. This article reports the first investigation of (polymer + surfactant) complex structures at solid-liquid interfaces. The valuable structural insights obtained by SFG analysis enable more accurate understandings of the composition-wettability (structure-function) relationship. These detailed understandings of interactions between sizing and the substrates promote more informed and optimized selections of sizing formulae.
Collapse
Affiliation(s)
- Chengcheng Zhang
- Department of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, United States
| | - Jinpeng Gao
- Department of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, United States
| | - Jeanne Hankett
- BASF Corporation, 1609 Biddle Avenue, Wyandotte, Michigan 48192, United States
| | - Prabodh Varanasi
- BASF Corporation, 1609 Biddle Avenue, Wyandotte, Michigan 48192, United States
| | - Charles O Kerobo
- BASF Corporation, 1609 Biddle Avenue, Wyandotte, Michigan 48192, United States
| | - Shouxun Zhao
- BASF Corporation, 1609 Biddle Avenue, Wyandotte, Michigan 48192, United States
| | - Zhan Chen
- Department of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, United States
| |
Collapse
|
20
|
Wang S, Sun W, Guo S, Liu X, Han X. Effects of Chiral Molecule Modification on Surface Biosorption Behavior. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:4441-4448. [PMID: 33829795 DOI: 10.1021/acs.langmuir.0c03551] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Antifouling materials have many important applications in biomedical devices and marine coating. Oligo(ethylene glycol) (OEG) or poly(ethylene glycol) (PEG) exhibit promising antifouling properties and are widely used in biomedical engineering. Chiral selection is an important phenomenon in biological processes. Because of the influence of steric hindrance, the modification of chiral molecules with different chirality at interfaces will affect the intermolecular interaction at the interfaces and lead to different structures of interfacial molecules. The difference of surface structures such as surface hydration structure would impact the adsorption of biomolecules on the surface, thus causing different varieties of cell adhesion and cell growth. In this study, the influence on surface hydration and surface cell adhesion of OEG self-assembled monolayers (SAMs) modified with cysteine showing different chirality are explored. The water structure at the interfaces of OEG/water in different conditions was probed with sum frequency generation vibrational spectroscopy (SFG-VS). The results show that the interfacial water structure can change significantly with either d-cysteine or l-cysteine modification on OEG. Water molecules are more ordered at the OEG/water interface under the d-cysteine modification on OEG SAMs, which improves the protein adsorption resistance of the surface. In contrast, l-cysteine modification would make the water less ordered at the OEG/protein solution interface and enhance the protein adsorption. Additionally, optical micrographs indicate that l-cysteine can significantly promote the OEG SAMs cell adhesion and growth, while d-cysteine exhibits an inhibitory effect, which is consistent with the results of SFG-VS experiments.
Collapse
Affiliation(s)
- Shujing 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
| | - Wenhua 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
| | - Shuxia Guo
- Institute for Brain and Intelligence, Southeast University, Nanjing 210096, China
| | - Xiaoyang Liu
- 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
| | - Xiaofeng 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
- Institute for Brain and Intelligence, Southeast University, Nanjing 210096, China
| |
Collapse
|
21
|
Singh R, Thorat V, Kaur H, Sodhi I, Samal SK, Jena KC, Sangamwar AT. Elucidating the Molecular Mechanism of Drug-Polymer Interplay in a Polymeric Supersaturated System of Rifaximin. Mol Pharm 2021; 18:1604-1621. [PMID: 33576626 DOI: 10.1021/acs.molpharmaceut.0c01022] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Supersaturated drug delivery system (SDDS) enables the solubility and sustained membrane transport of poorly water-soluble drugs. SDDS provides higher drug concentration in the dispersed phase and equilibrium in the continuous phase, which corresponds to amorphous solubility of the drug. Rifaximin (RFX) is a nonabsorbable BCS class IV drug approved for the treatment of irritable bowel syndrome and effective against Helicobacter pylori. RFX shows slow crystallization and precipitation in an acidic pH of 1.2-2, leading to obliteration of its activity in the gastrointestinal tract. The objective of the present study is to inhibit the precipitation of RFX, involving screening of polymers at different concentrations, using an in-house developed microarray plate method and solubility studies which set forth hydroxypropyl methylcellulose (HPMC) E15, Soluplus, and polyvinyl alcohol to be effective precipitation inhibitors (PIs). Drug-polymer precipitates (PPTS) are examined for surface morphology by scanning electron microscopy, solid-phase transformation by hot stage microscopy, the nature of PPTS by polarized light microscopy, and drug-polymer interactions by Fourier transform infrared and nuclear magnetic resonance spectroscopy. Besides, the unfathomed molecular mechanism of drug-polymer interplay is discerned at the air-water interface using sum-frequency generation spectroscopy to correlate the interfacial hydrogen bonding properties in bulk water. Surprisingly, all studies disseminate HPMC E15 and Soluplus as effective PIs of RFX.
Collapse
Affiliation(s)
- Ridhima Singh
- Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar, Punjab 160062, India
| | - Vaibhav Thorat
- Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar, Punjab 160062, India
| | - Harpreet Kaur
- Department of Physics, Indian Institute of Technology (IIT) Ropar, Rupnagar, Punjab 140001, India
| | - Ikjot Sodhi
- Formulation Development, Fresenius Kabi Oncology Ltd., Gurgaon, Haryana 122001, India
| | - Sanjaya K Samal
- Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar, Punjab 160062, India
| | - Kailash C Jena
- Department of Physics, Indian Institute of Technology (IIT) Ropar, Rupnagar, Punjab 140001, India
| | - Abhay T Sangamwar
- Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar, Punjab 160062, India
| |
Collapse
|
22
|
Guo W, Xu S, Reichart TM, Xiao M, Lu T, Mello C, Chen Z. Probing Molecular Interactions between Surface-Immobilized Antimicrobial Peptides and Lipopolysaccharides In Situ. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:12383-12393. [PMID: 33034460 DOI: 10.1021/acs.langmuir.0c02492] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Lipopolysaccharide (LPS) is a component of the outer membrane of Gram-negative bacteria. Recently, a label-free immobilized antimicrobial peptide (AMP) surface plasmon resonance platform was developed to successfully distinguish LPS from multiple bacterial strains. Among the tested AMPs, SMAP29 exhibited excellent affinity with LPS and has two independent LPS-binding sites located at two termini of the peptide. In this study, sum frequency generation vibrational spectroscopy was applied to investigate molecular interactions between three LPS samples and surface-immobilized SMAP29 via the N-terminus, the C-terminus, and a middle site at the solid/liquid interface in situ in real-time, supplemented by circular dichroism spectroscopy. It was found that the conformations and orientations of surface-immobilized SMAP29 via different sites are different when interacting with the same LPS, with different interaction kinetics. The same SMAP29 sample also has different structures and interaction kinetics while interacting with different LPS samples with different charge densities and hydrophobicities. The observed results on molecular interactions between surface-immobilized peptides and LPS can well interpret the different adsorption amounts of various LPSs on different surface-immobilized peptides.
Collapse
Affiliation(s)
- Wen Guo
- Department of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, United States
| | - Shan Xu
- Department of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, United States
| | - Timothy M Reichart
- Office of the Chief Scientist, Combat Capabilities Development Command Soldier Center, 15 Kansas Street, Natick, Massachusetts 01760, United States
- Department of Chemistry, Hampden-Sydney College, Hampden-Sydney, VA 23943, United States
| | - Minyu Xiao
- Department of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, United States
| | - Tieyi Lu
- Department of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, United States
| | - Charlene Mello
- Office of the Chief Scientist, Combat Capabilities Development Command Soldier Center, 15 Kansas Street, Natick, Massachusetts 01760, United States
| | - Zhan Chen
- Department of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, United States
| |
Collapse
|
23
|
Zhang L, Tan J, Pei Q, Ye S. Film thickness and surface plasmon tune the contribution of SFG signals from buried interface and air surface. CHINESE J CHEM PHYS 2020. [DOI: 10.1063/1674-0068/cjcp2006113] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Liang Zhang
- Hefei National Laboratory for Physical Sciences at the Microscale, and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
- Synergetic Innovation Center of Quantum Information Quantum Physics, University of Science and Technology of China, Hefei 230026, China
| | - Junjun Tan
- Hefei National Laboratory for Physical Sciences at the Microscale, and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
- Synergetic Innovation Center of Quantum Information Quantum Physics, University of Science and Technology of China, Hefei 230026, China
| | - Quanbing Pei
- Hefei National Laboratory for Physical Sciences at the Microscale, and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
- Synergetic Innovation Center of Quantum Information Quantum Physics, University of Science and Technology of China, Hefei 230026, China
| | - Shuji Ye
- Hefei National Laboratory for Physical Sciences at the Microscale, and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
- Synergetic Innovation Center of Quantum Information Quantum Physics, University of Science and Technology of China, Hefei 230026, China
| |
Collapse
|
24
|
Li B, Andre JS, Chen X, Walther B, Paradkar R, Feng C, Tucker C, Mohler C, Chen Z. Probing Molecular Behavior of Carbonyl Groups at Buried Nylon/Polyolefin Interfaces in Situ. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:11349-11357. [PMID: 32870007 DOI: 10.1021/acs.langmuir.0c02188] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Nylon and maleic anhydride (MAH)-grafted polyolefin-based thin co-extruded multilayer films are widely used in packaging applications encountered in daily life. The molecular structure of the nylon/MAH-grafted polyolefin buried interface and molecular bonding between these two chemically dissimilar layers are thought to play an important role in achieving packaging structures with good adhesion. Here, the molecular bonds present at a nylon/maleic anhydride (MAH)-grafted polyethylene buried interface were systematically examined in situ for the first time using sum frequency generation (SFG) vibrational spectroscopy. The carbonyl stretching frequency region of the SFG spectra of a nylon/MAH-grafted polyethylene buried interface showed the presence of hydrolyzed MAH groups grafted to the polyethylene chain and very low levels of unreacted MAH enriched at the buried interface. The ability of SFG to detect these molecular species at the buried interface yields important understanding of the interfacial molecular structure and provides the basis for subsequent in situ studies of the bonding reaction between the grafted MAH and nylon directly at the interface. This understanding may guide the design of multilayer films with improved properties such as enhanced adhesion between polymer layers. The approach used in this study is general and is applicable to study the molecular characteristics of other buried interfaces of significance, such as buried interfaces involving polymers in solar cells, polymer semiconductors, and batteries. Nylon impact modification is another area of interest where the interaction between the MAH-grafted elastomer and the continuous phase of nylon is important.
Collapse
Affiliation(s)
- Bolin Li
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - John S Andre
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Xiaoyun Chen
- Core R&D, The Dow Chemical Company, Midland, Michigan 48674, United States
| | - Brian Walther
- Packaging and Specialty Plastics, The Dow Chemical Company, Lake Jackson, Texas 77541, United States
| | - Rajesh Paradkar
- Packaging and Specialty Plastics, The Dow Chemical Company, Lake Jackson, Texas 77541, United States
| | - Chuang Feng
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Christopher Tucker
- Core R&D, The Dow Chemical Company, Midland, Michigan 48674, United States
| | - Carol Mohler
- Core R&D, The Dow Chemical Company, Midland, Michigan 48674, United States
| | - Zhan Chen
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| |
Collapse
|
25
|
Xu BW, Niu RJ, Liu Q, Yang JY, Zhang WH, Young DJ. Similarities and differences between Mn(II) and Zn(II) coordination polymers supported by porphyrin-based ligands: synthesis, structures and nonlinear optical properties. Dalton Trans 2020; 49:12622-12631. [PMID: 32870218 DOI: 10.1039/d0dt02450c] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Four coordination polymers (CPs) Mn-TMPP (1), Zn-TMPP (2), Mn-THPP (3), and Zn-THPP (4) have been synthesized and characterized (H2TMPP = meso-tetrakis (6-methylpyridin-3-yl) porphyrin; H2THPP = meso-tetrakis (6-(hydroxymethyl) pyridin-3-yl) porphyrin). The one-dimensional (1D) chain compound 1 is formed via a head-to-tail connection of the Mn-TMPP unit, wherein the central Mn2+ features a square pyramidal geometry coordinated by four N atoms from the porphyrin skeleton and one additional N atom from an adjacent Mn-TMPP unit. Compound 2 features an octahedral Zn2+ center associated with four N atoms from the porphyrin skeleton to define the equatorial plane and two additional N donors at the axial positions to give a two-dimensional (2D) CP. The 1D chain of 1 and the 2D layer of 2 possess distinctive molecular structures but nearly identical molecular arrangements in their unit cells viewed along all three crystallographic axes. By contrast, Mn- and Zn-based CPs 3 and 4 supported by the THPP ligand share both identical molecular connectivities and crystal packing. In 3/4, each Mn/Zn center is chelated by four N donors of the porphyrin interior to define the equatorial plane of an octahedron, whose axial sites are occupied by two alcoholic OH groups from a pair of trans-located pyridinemethanol moieties. The third-order nonlinear optical properties of 1-4 investigated using the Z-scan technique at 532 nm revealed reverse saturable absorption and self-focusing effects for all four CPs, with hyperpolarizability values (γ) in the range 1.42 × 10-28 esu to 7.64 × 10-28 esu. These high γ values are comparable to the best porphyrin-based molecular assemblies, demonstrating potential for these materials in optical limiting applications.
Collapse
Affiliation(s)
- Bo-Wei Xu
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China.
| | - Ru-Jie Niu
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China.
| | - Quan Liu
- College of Chemistry and Chemical Engineering, Nantong University, Nantong 226019, China.
| | - Jun-Yi Yang
- College of Physics, Optoelectronics, and Energy, Soochow University, Suzhou 215006, China.
| | - Wen-Hua Zhang
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China.
| | - David J Young
- College of Engineering, Information Technology & Environment, Charles Darwin University, Darwin, Northern Territory 0909, Australia
| |
Collapse
|
26
|
Wang W, Tan J, Ye S. Unsaturated Lipid Accelerates Formation of Oligomeric β-Sheet Structure of GP41 Fusion Peptide in Model Cell Membrane. J Phys Chem B 2020; 124:5169-5176. [PMID: 32453953 DOI: 10.1021/acs.jpcb.0c02464] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Membrane fusion of the viral and host cell membranes is the initial step of virus infection and is catalyzed by fusion peptides. Although the β-sheet structure of fusion peptides has been proposed to be the most important fusion-active conformation, it is still very challenging to experimentally identify different types of β-sheet structures at the cell membrane surface in situ and in real time. In this work, we demonstrate that the interface-sensitive amide II spectral signals of protein backbones, generated by the sum frequency generation vibrational spectroscopy, provide a sensitive probe for directly capturing the formation of oligomeric β-sheet structure of fusion peptides. Using human immunodeficiency virus (HIV) glycoprotein GP41 fusing peptide (FP23) as the model, we find that formation speed of oligomeric β-sheet structure depends on lipid unsaturation. The unsaturated lipid such as POPG can accelerate formation of oligomeric β-sheet structure of FP23. The β-sheet structure is more deeply inserted into the hydrophobic region of the POPG bilayer than the α-helical segment. This work will pave the way for future researches on capturing intermediate structures during membrane fusion processes and revealing the fusion mechanism.
Collapse
Affiliation(s)
- Wenting Wang
- Hefei National Laboratory for Physical Sciences at the Microscale, and Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Junjun Tan
- Hefei National Laboratory for Physical Sciences at the Microscale, and Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Shuji Ye
- Hefei National Laboratory for Physical Sciences at the Microscale, and Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| |
Collapse
|
27
|
Zhang C, Gao J, Hankett J, Varanasi P, Borst J, Shirazi Y, Zhao S, Chen Z. Corn Oil-Water Separation: Interactions of Proteins and Surfactants at Corn Oil/Water Interfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:4044-4054. [PMID: 32212710 DOI: 10.1021/acs.langmuir.0c00338] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Purification and collection of industrial products from oil-water mixtures are commonly implemented processes. However, the efficiencies of such processes can be severely influenced by the presence of emulsifiers that induce the formation of small oil droplets dispersed in the mixtures. Understanding of this emulsifying effect and its counteractions which occur at the oil/water interface is therefore necessary for the improvement of designs of these processes. In this paper, we investigated the interfacial mechanisms of protein-induced emulsification and the opposing surfactant-induced demulsification related to corn oil refinement. At corn oil/water interfaces, the pH-dependent emulsifying function of zein protein, which is the major storage protein of corn, was elucidated by the surface/interface-sensitive sum frequency generation (SFG) vibrational spectroscopy technique. The effective stabilization of corn oil droplets by zein protein was illustrated and correlated to its ordered amide I group at the oil/water interface. Substantial decrease of this ordering with the addition of three industrial surfactants to corn oil-zein solution mixtures was also observed using SFG, which explains the surfactant-induced destabilization and coalescence of small oil droplets. Surfactant-protein interaction was then demonstrated to be the driving force for the disordering of interfacial proteins, either by disrupting protein layers or partially excluding protein molecules from the interface. The ordered zein proteins at the interface were therefore revealed to be the critical factor for the formation of corn oil-water emulsion.
Collapse
Affiliation(s)
- Chengcheng Zhang
- Department of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, United States
| | - Jinpeng Gao
- Department of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, United States
| | - Jeanne Hankett
- BASF Corporation, 1609 Biddle Avenue, Wyandotte, Michigan 48192, United States
| | - Prabodh Varanasi
- BASF Corporation, 1609 Biddle Avenue, Wyandotte, Michigan 48192, United States
| | - Joseph Borst
- BASF Corporation, 1609 Biddle Avenue, Wyandotte, Michigan 48192, United States
| | - Yaser Shirazi
- BASF Corporation, 1609 Biddle Avenue, Wyandotte, Michigan 48192, United States
| | - Shouxun Zhao
- BASF Corporation, 1609 Biddle Avenue, Wyandotte, Michigan 48192, United States
| | - Zhan Chen
- Department of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, United States
| |
Collapse
|
28
|
Zhang J, Tan J, Pei R, Ye S. Acidic Environment Significantly Alters Aggregation Pathway of Human Islet Amyloid Polypeptide at Negative Lipid Membrane. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:1530-1537. [PMID: 31995712 DOI: 10.1021/acs.langmuir.9b03623] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The misfolding and aggregation of human islet amyloid polypeptide (hIAPP) at cell membrane has a close relationship with the development of type 2 diabetes (T2DM). This aggregation process is susceptible to various physiologically related factors, and systematic studies on condition-mediated hIAPP aggregation are therefore essential for a thorough understanding of the pathology of T2DM. In this study, we combined surface-sensitive amide I and amide II spectral signals from the protein backbone, generated simultaneously in a highly sensitive femtosecond broad-band sum frequency generation vibrational spectroscopy system, to examine the effect of environmental pH on the dynamical structural changes of hIAPP at membrane surface in situ and in real time. Such a combination can directly discriminate the formation of β-hairpin-like monomer and oligomer/fibril at the membrane surface. It is evident that, in an acidic milieu, hIAPP slows down its conformational evolution and alters its aggregation pathway, leading to the formation of off-pathway oligomers. When matured hIAPP aggregates are exposed to basic subphase, partial conversion from β-sheet oligomers into ordered β-sheet fibrillar structures is observed. When exposed to acidic environment, however, hIAPP fibrils partially converse into more loosely patterned β-sheet oligomeric structures.
Collapse
Affiliation(s)
- Jiahui Zhang
- Hefei National Laboratory for Physical Sciences at the Microscale, and Department of Chemical Physics , University of Science and Technology of China , Hefei , Anhui 230026 , China
| | - Junjun Tan
- Hefei National Laboratory for Physical Sciences at the Microscale, and Department of Chemical Physics , University of Science and Technology of China , Hefei , Anhui 230026 , China
| | - Ruoqi Pei
- Hefei National Laboratory for Physical Sciences at the Microscale, and Department of Chemical Physics , University of Science and Technology of China , Hefei , Anhui 230026 , China
| | - Shuji Ye
- Hefei National Laboratory for Physical Sciences at the Microscale, and Department of Chemical Physics , University of Science and Technology of China , Hefei , Anhui 230026 , China
| |
Collapse
|
29
|
Fies WA, First JT, Dugger JW, Doucet M, Browning JF, Webb LJ. Quantifying the Extent of Hydration of a Surface-Bound Peptide Using Neutron Reflectometry. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:637-649. [PMID: 31846580 DOI: 10.1021/acs.langmuir.9b02559] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Establishing how water, or the absence of water, affects the structure, dynamics, and function of proteins in contact with inorganic surfaces is critical to developing successful protein immobilization strategies. In the present article, the quantity of water hydrating a monolayer of helical peptides covalently attached to self-assembled monolayers (SAMs) of alkyl thiols on Au was measured using neutron reflectometry (NR). The peptide sequence was composed of repeating LLKK units in which the leucines were aligned to face the SAM. When immersed in water, NR measured 2.7 ± 0.9 water molecules per thiol in the SAM layer and between 75 ± 13 and 111 ± 13 waters around each peptide. The quantity of water in the SAM was nearly twice that measured prior to peptide functionalization, suggesting that the peptide disrupted the structure of the SAM. To identify the location of water molecules around the peptide, we compared our NR data to previously published molecular dynamics simulations of the same peptide on a hydrophobic SAM in water, revealing that 49 ± 5 of 95 ± 8 total nearby water molecules were directly hydrogen-bound to the peptide. Finally, we show that immersing the peptide in water compressed its structure into the SAM surface. Together, these results demonstrate that there is sufficient water to fully hydrate a surface-bound peptide even at hydrophobic interfaces. Given the critical role that water plays in biomolecular structure and function, these results are expected to be informative for a broad array of applications involving proteins at the bio/abio interface.
Collapse
Affiliation(s)
- Whitney A Fies
- Department of Chemistry and Texas Materials Institute , The University of Texas at Austin , 2506 Speedway STOP A5300 , Austin , Texas 78712 , United States
| | - Jeremy T First
- Department of Chemistry and Texas Materials Institute , The University of Texas at Austin , 2506 Speedway STOP A5300 , Austin , Texas 78712 , United States
| | - Jason W Dugger
- Center for Nanophase Materials Sciences , Oak Ridge National Laboratory , Oak Ridge , Tennessee 37830 , United States
| | - Mathieu Doucet
- Neutron Scattering Division , Oak Ridge National Laboratory , Oak Ridge , Tennessee 37831 , United States
| | - James F Browning
- Neutron Scattering Division , Oak Ridge National Laboratory , Oak Ridge , Tennessee 37831 , United States
| | - Lauren J Webb
- Department of Chemistry and Texas Materials Institute , The University of Texas at Austin , 2506 Speedway STOP A5300 , Austin , Texas 78712 , United States
| |
Collapse
|
30
|
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
|
31
|
Perera HAG, Lu T, Fu L, Zhang J, Chen Z. Probing the Interfacial Interactions of Monoclonal and Bispecific Antibodies at the Silicone Oil-Aqueous Solution Interface by Using Sum Frequency Generation Vibrational Spectroscopy. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:14339-14347. [PMID: 31597425 DOI: 10.1021/acs.langmuir.9b02768] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Silicone oil has been widely utilized in the pharmaceutical industry especially as a lubricant coating commonly used in syringes for the smooth delivery of drugs. Protein structure perturbation and aggregation have been reported upon protein contacting silicone oil by using indirect methods and ex-situ techniques. The conclusions derived from such indirect and ex-situ methods may not truly reflect the exact nature of the protein-silicone oil interfacial interactions. Recently, we have successfully demonstrated that sum frequency generation (SFG) vibrational spectroscopy can be used as a powerful and direct method of studying the fusion protein-silicone oil interfacial interactions in situ and in real time. In this article, we studied monoclonal and bispecific antibody interactions with the silicone oil surface by using SFG spectroscopy. Being structurally and functionally different in the nature of fusion proteins and antibodies, this study is important in enhancing our current understanding of protein-silicone oil interfacial interactions. Both types of antibodies investigated here readily and strongly adsorb onto the silicone oil surface and remain stable at least for 10 h. SFG spectra in the amide I region for monoclonal and bispecific antibodies centered at 1660 and 1665 cm-1, respectively, suggest the difference in their molecular structures. The absence of the antibody signals in the amide I region of time-dependent and static SFG spectra obtained for preadsorbed antibodies onto silicone oil after contacting polysorbate 80 (PS-80) surfactant suggests that PS-80 can effectively remove both types of antibodies from the silicone oil surface. This study demonstrated the feasibility of using SFG spectroscopy as a powerful tool for probing the antibody-interfacial interactions in situ and in real time.
Collapse
Affiliation(s)
- H A Ganganath Perera
- Department of Chemistry , University of Michigan , Ann Arbor , Michigan 48109 , United States
| | - Tieyi Lu
- Department of Chemistry , University of Michigan , Ann Arbor , Michigan 48109 , United States
| | - Li Fu
- Sanofi , 1 The Mountain Road , Framingham , Massachusetts 01701 , United States
| | - Jifeng Zhang
- Sanofi , 1 The Mountain Road , Framingham , Massachusetts 01701 , United States
| | - Zhan Chen
- Department of Chemistry , University of Michigan , Ann Arbor , Michigan 48109 , United States
| |
Collapse
|
32
|
Bernhard C, Roeters SJ, Bauer KN, Weidner T, Bonn M, Wurm FR, Gonella G. Both Poly(ethylene glycol) and Poly(methyl ethylene phosphate) Guide Oriented Adsorption of Specific Proteins. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:14092-14097. [PMID: 31568725 DOI: 10.1021/acs.langmuir.9b02275] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Developing new functional biomaterials requires the ability to simultaneously repel unwanted and guide wanted protein adsorption. Here, we systematically interrogate the factors determining the protein adsorption by comparing the behaviors of different polymeric surfaces, poly(ethylene glycol) and a poly(phosphoester), and five different natural proteins. Interestingly we observe that, at densities comparable to those used in nanocarrier functionalization, the same proteins are either adsorbed (fibrinogen, human serum albumin, and transferrin) or repelled (immunoglobulin G and lysozyme) by both polymers. However, when adsorption takes place, the specific surface dictates the amount and orientation of each protein.
Collapse
Affiliation(s)
- Christoph Bernhard
- Max Planck Institute for Polymer Research , Ackermannweg 10 , 55128 Mainz , Germany
| | - Steven J Roeters
- Department of Chemistry , Aarhus University , 8000 Aarhus C , Denmark
| | - Kristin N Bauer
- Max Planck Institute for Polymer Research , Ackermannweg 10 , 55128 Mainz , Germany
| | - Tobias Weidner
- Department of Chemistry , Aarhus University , 8000 Aarhus C , Denmark
| | - Mischa Bonn
- Max Planck Institute for Polymer Research , Ackermannweg 10 , 55128 Mainz , Germany
| | - Frederik R Wurm
- Max Planck Institute for Polymer Research , Ackermannweg 10 , 55128 Mainz , Germany
| | - Grazia Gonella
- Max Planck Institute for Polymer Research , Ackermannweg 10 , 55128 Mainz , Germany
| |
Collapse
|
33
|
Chen SH, Singer SJ. Molecular Dynamics Study of the Electric Double Layer and Nonlinear Spectroscopy at the Amorphous Silica–Water Interface. J Phys Chem B 2019; 123:6364-6384. [DOI: 10.1021/acs.jpcb.9b05871] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- Si-Han Chen
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43210, United States
| | - Sherwin J. Singer
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43210, United States
| |
Collapse
|
34
|
Lu H, Schäfer A, Lutz H, Roeters SJ, Lieberwirth I, Muñoz-Espí R, Hood MA, Bonn M, Weidner T. Peptide-Controlled Assembly of Macroscopic Calcium Oxalate Nanosheets. J Phys Chem Lett 2019; 10:2170-2174. [PMID: 30978286 PMCID: PMC6727606 DOI: 10.1021/acs.jpclett.9b00684] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2019] [Accepted: 04/12/2019] [Indexed: 05/27/2023]
Abstract
The fabrication of two-dimensional (2D) biomineral nanosheets is of high interest owing to their promise for applications in electronics, filtration, catalysis, and chemical sensing. Using a facile approach inspired by biomineralization in nature, we fabricate laterally macroscopic calcium oxalate nanosheets using β-folded peptides. The template peptides are composed of repetitive glutamic acid and leucine amino acids, self-organized at the air-water interface. Surface-specific sum frequency generation spectroscopy and molecular dynamics simulations reveal that the formation of oxalate nanosheets relies on the peptide-Ca2+ ion interaction at the interface, which not only restructures the peptides but also templates Ca2+ ions into a calcium oxalate dihydrate lattice. Combined, this enables the formation of a critical structural intermediate in the assembly pathway toward the oxalate sheet formation. These insights into peptide-ion interfacial interaction are important for designing novel inorganic 2D materials.
Collapse
Affiliation(s)
- Hao Lu
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Arne Schäfer
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Helmut Lutz
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Steven J. Roeters
- Department
of Chemistry, Aarhus University, Langelandsgade 140, 8000 Aarhus C, Denmark
| | - Ingo Lieberwirth
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Rafael Muñoz-Espí
- Institute
of Materials Science (ICMUV), Universitat
de València, C/Catedràtic
José Beltrán 2, 46980 Paterna, Spain
| | - Matthew A. Hood
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Mischa Bonn
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Tobias Weidner
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
- Department
of Chemistry, Aarhus University, Langelandsgade 140, 8000 Aarhus C, Denmark
| |
Collapse
|
35
|
Han X, Leng C, Shao Q, Jiang S, Chen Z. Absolute Orientations of Water Molecules at Zwitterionic Polymer Interfaces and Interfacial Dynamics after Salt Exposure. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:1327-1334. [PMID: 30457875 DOI: 10.1021/acs.langmuir.8b01515] [Citation(s) in RCA: 46] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Nonfouling zwitterionic polymers have wide applications ranging from the naval industry to biomedical engineering. Strong hydration at polymer surfaces has been proven to be crucial to their nonfouling property, but the absolute orientations of water molecules on the polymers and the competition between water and salt binding have not been elucidated. In this work, the absolute orientations of water molecules on two zwitterionic polymer brushes, poly(carboxybetaine methacrylate) (pCBMA) and poly(sulfobetaine methacrylate) (pSBMA), were measured using regular and phase-sensitive sum frequency generation (SFG) vibrational spectroscopy. The pH-dependent studies in a pH range from 2 to 12 showed that at a pH of 7, the water absolute orientations are different on the pCBMS and pSBMA surfaces. Phase-sensitive SFG studies confirmed the results obtained from the pH-dependent measurements. Salt effects on the hydration of zwitterionic polymers were examined as a function of time, which indicated that the pCBMA surface and the associated interfacial water exhibit a slow restructuring process after salt binding (likely due to the strong binding of pCBMA with water), whereas the surface of pSBMA and the associated water have a fast change after salt binding.
Collapse
Affiliation(s)
- Xiaofeng 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
| | - Chuan Leng
- Department of Chemistry , University of Michigan , Ann Arbor , Michigan 48109 , United States
| | - Qing Shao
- Department of Chemical Engineering , University of Washington , Seattle , Washington 98195 , United States
| | - Shaoyi Jiang
- Department of Chemical Engineering , University of Washington , Seattle , Washington 98195 , United States
| | - Zhan Chen
- Department of Chemistry , University of Michigan , Ann Arbor , Michigan 48109 , United States
| |
Collapse
|
36
|
Bernhard C, Bauer KN, Bonn M, Wurm FR, Gonella G. Interfacial Conformation of Hydrophilic Polyphosphoesters Affects Blood Protein Adsorption. ACS APPLIED MATERIALS & INTERFACES 2019; 11:1624-1629. [PMID: 30516968 DOI: 10.1021/acsami.8b17146] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Synthetic polymers are commonly used as protein repelling materials for a variety of biomedical applications. Despite their widespread use, the fundamental mechanism underlying protein repellence is often elusive. Such insights are essential for improving existing and developing new materials. Here, we investigate how subtle differences in the chemistry of hydrophilic polyphosphoesters influence the adsorption of the human blood proteins serum albumin and fibrinogen. Using thermodynamic measurements, surface-specific vibrational spectroscopy, and Brewster angle microscopy, we investigate protein adsorption, hydration, and steric repulsion properties of the polyphosphoester polymers. Whereas both surface hydration and polymer conformation of the polymers vary substantially as a consequence of the chemical differences in the polymer structure, the protein repellency ability of these hydrophilic materials appears to be dominated by steric repulsion.
Collapse
Affiliation(s)
- Christoph Bernhard
- Max Planck Institute for Polymer Research, Ackermannweg 10 , 55128 Mainz , Germany
| | - Kristin N Bauer
- Max Planck Institute for Polymer Research, Ackermannweg 10 , 55128 Mainz , Germany
| | - Mischa Bonn
- Max Planck Institute for Polymer Research, Ackermannweg 10 , 55128 Mainz , Germany
| | - Frederik R Wurm
- Max Planck Institute for Polymer Research, Ackermannweg 10 , 55128 Mainz , Germany
| | - Grazia Gonella
- Max Planck Institute for Polymer Research, Ackermannweg 10 , 55128 Mainz , Germany
| |
Collapse
|
37
|
Niu RJ, Zhou WF, Liu Y, Yang JY, Zhang WH, Lang JP, Young DJ. Morphology-dependent third-order optical nonlinearity of a 2D Co-based metal-organic framework with a porphyrinic skeleton. Chem Commun (Camb) 2019; 55:4873-4876. [PMID: 30951050 DOI: 10.1039/c9cc01363f] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A two-dimensional (2D) Co-based metal-organic framework (MOF) with porphyrinic skeleton forms crystalline plates, flower-shaped clusters, and ultrathin films under optimized conditions, including the use of polyvinylpyrrolidone (PVP) as a surfactant. Ultrathin films demonstrate the best solution-based third-order nonlinear optical properties, featuring a nonlinear transmittance (T) value of 0.54, absorption coefficient (α2) of 9.5 × 10-10 m W-1 and second hyperpolarizability (γ) value of 1.37 × 10-28 esu, which are slightly better than those of the flower-shaped clusters (T = 0.65, α2 = 7.0 × 10-10 m W-1; γ = 1.27 × 10-28 esu), but marginally better than those of the crystalline thin plates (T = 0.94, α2 = 2.4 × 10-10 m W-1; γ = 0.24 × 10-28 esu).
Collapse
Affiliation(s)
- Ru-Jie Niu
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China.
| | | | | | | | | | | | | |
Collapse
|
38
|
Xiao M, Jasensky J, Gerszberg J, Chen J, Tian J, Lin T, Lu T, Lahann J, Chen Z. Chemically Immobilized Antimicrobial Peptide on Polymer and Self-Assembled Monolayer Substrates. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:12889-12896. [PMID: 30277782 DOI: 10.1021/acs.langmuir.8b02377] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Surfaces with chemically immobilized antimicrobial peptides have been shown to have great potential in various applications such as biosensors and antimicrobial coatings. This research investigated the chemical immobilization of a cecropin-melittin hybrid antimicrobial peptide on two different surfaces, a polymer surface prepared by chemical vapor deposition (CVD) polymerization and a self-assembled monolayer surface. We probed the structure of immobilized peptides using spectroscopic methods and correlated such structural information to the measured antimicrobial activity. We found that the hybrid peptide adopts an α-helical structure after immobilization onto both surfaces. As we have shown previously for another α-helical peptide, MSI-78, immobilized on a SAM, we found that the α-helical hybrid peptide lies down when it contacts bacteria. This study shows that the antimicrobial activity of the surface-immobilized peptides on the two substrates can be well explained by the spectroscopically measured peptide structural data. In addition, it was found that the polymer-based antimicrobial peptide coating is more stable. This is likely due to the fact that the SAM prepared using silane may be degraded after several days whereas the polymer prepared by CVD polymerization is more stable than the SAM, leading to a more stable antimicrobial coating.
Collapse
|
39
|
Ge A, Qiao L, Seo JH, Yui N, Ye S. Surface-Restructuring Differences between Polyrotaxanes and Random Copolymers in Aqueous Environment. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:12463-12470. [PMID: 30216076 DOI: 10.1021/acs.langmuir.8b02676] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
In the present study, we investigated the surface reorganization behaviors and adsorption conformations of fibrinogen on the surface of polyrotaxanes containing different amounts of α-cyclodextrin (α-CD) by using surface-sensitive vibrational spectroscopy sum frequency generation (SFG). For comparison, behaviors of the surface restructuring and fibrinogen adsorption on the random copolymers containing similar terminal groups were also investigated. It was found that larger amounts of BMA moieties of polyrotaxanes form ordered surface structures after immersion in water for 48 h. Furthermore, the polyrotaxane surfaces exhibit a much higher capability of fibrinogen adsorption than the random copolymer surfaces. The water-induced surface restructuring of the polyrotaxane films slightly affects the adsorption structure of the fibrinogen molecules.
Collapse
Affiliation(s)
- Aimin Ge
- Institute for Catalysis , Hokkaido University , Sapporo 001-0021 , Japan
| | - Lin Qiao
- Institute for Catalysis , Hokkaido University , Sapporo 001-0021 , Japan
| | - Ji-Hun Seo
- Institute of Biomaterials and Bioengineering , Tokyo Medical and Dental University , Tokyo 101-0062 , Japan
| | - Nobuhiko Yui
- Institute of Biomaterials and Bioengineering , Tokyo Medical and Dental University , Tokyo 101-0062 , Japan
| | - Shen Ye
- Department of Chemistry, Graduate School of Science , Tohoku University , Sendai 980-8578 , Japan
| |
Collapse
|
40
|
Morsbach S, Gonella G, Mailänder V, Wegner S, Wu S, Weidner T, Berger R, Koynov K, Vollmer D, Encinas N, Kuan SL, Bereau T, Kremer K, Weil T, Bonn M, Butt HJ, Landfester K. Engineering von Proteinen an Oberflächen: Von komplementärer Charakterisierung zu Materialoberflächen mit maßgeschneiderten Funktionen. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201712448] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Svenja Morsbach
- Max Planck-Institut für Polymerforschung; Ackermannweg 10 55128 Mainz Deutschland
| | - Grazia Gonella
- Max Planck-Institut für Polymerforschung; Ackermannweg 10 55128 Mainz Deutschland
| | - Volker Mailänder
- Max Planck-Institut für Polymerforschung; Ackermannweg 10 55128 Mainz Deutschland
- Abteilung für Dermatologie; Universitätsmedizin der Johannes Gutenberg-Universität Mainz; Langenbeckstraße 1 55131 Mainz Deutschland
| | - Seraphine Wegner
- Max Planck-Institut für Polymerforschung; Ackermannweg 10 55128 Mainz Deutschland
| | - Si Wu
- Max Planck-Institut für Polymerforschung; Ackermannweg 10 55128 Mainz Deutschland
| | - Tobias Weidner
- Max Planck-Institut für Polymerforschung; Ackermannweg 10 55128 Mainz Deutschland
- Abteilung für Chemie; Universität Aarhus; Langelandsgade 140 8000 Aarhus C Dänemark
| | - Rüdiger Berger
- Max Planck-Institut für Polymerforschung; Ackermannweg 10 55128 Mainz Deutschland
| | - Kaloian Koynov
- Max Planck-Institut für Polymerforschung; Ackermannweg 10 55128 Mainz Deutschland
| | - Doris Vollmer
- Max Planck-Institut für Polymerforschung; Ackermannweg 10 55128 Mainz Deutschland
| | - Noemí Encinas
- Max Planck-Institut für Polymerforschung; Ackermannweg 10 55128 Mainz Deutschland
| | - Seah Ling Kuan
- Max Planck-Institut für Polymerforschung; Ackermannweg 10 55128 Mainz Deutschland
| | - Tristan Bereau
- Max Planck-Institut für Polymerforschung; Ackermannweg 10 55128 Mainz Deutschland
| | - Kurt Kremer
- Max Planck-Institut für Polymerforschung; Ackermannweg 10 55128 Mainz Deutschland
| | - Tanja Weil
- Max Planck-Institut für Polymerforschung; Ackermannweg 10 55128 Mainz Deutschland
| | - Mischa Bonn
- Max Planck-Institut für Polymerforschung; Ackermannweg 10 55128 Mainz Deutschland
| | - Hans-Jürgen Butt
- Max Planck-Institut für Polymerforschung; Ackermannweg 10 55128 Mainz Deutschland
| | - Katharina Landfester
- Max Planck-Institut für Polymerforschung; Ackermannweg 10 55128 Mainz Deutschland
| |
Collapse
|
41
|
Morsbach S, Gonella G, Mailänder V, Wegner S, Wu S, Weidner T, Berger R, Koynov K, Vollmer D, Encinas N, Kuan SL, Bereau T, Kremer K, Weil T, Bonn M, Butt HJ, Landfester K. Engineering Proteins at Interfaces: From Complementary Characterization to Material Surfaces with Designed Functions. Angew Chem Int Ed Engl 2018; 57:12626-12648. [PMID: 29663610 PMCID: PMC6391961 DOI: 10.1002/anie.201712448] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2017] [Revised: 03/13/2018] [Indexed: 01/17/2023]
Abstract
Once materials come into contact with a biological fluid containing proteins, proteins are generally—whether desired or not—attracted by the material's surface and adsorb onto it. The aim of this Review is to give an overview of the most commonly used characterization methods employed to gain a better understanding of the adsorption processes on either planar or curved surfaces. We continue to illustrate the benefit of combining different methods to different surface geometries of the material. The thus obtained insight ideally paves the way for engineering functional materials that interact with proteins in a predetermined manner.
Collapse
Affiliation(s)
- Svenja Morsbach
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Grazia Gonella
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Volker Mailänder
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany.,Department of Dermatology, University Medical Center Johannes Gutenberg-University Mainz, Langenbeckstraße 1, 55131, Mainz, Germany
| | - Seraphine Wegner
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Si Wu
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Tobias Weidner
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany.,Department of Chemistry, Aarhus University, Langelandsgade 140, 8000, Aarhus C, Denmark
| | - Rüdiger Berger
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Kaloian Koynov
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Doris Vollmer
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Noemí Encinas
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Seah Ling Kuan
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Tristan Bereau
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Kurt Kremer
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Tanja Weil
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Mischa Bonn
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Hans-Jürgen Butt
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Katharina Landfester
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| |
Collapse
|
42
|
Jasensky J, Ferguson K, Baria M, Zou X, McGinnis R, Kaneshiro A, Badieyan S, Wei S, Marsh ENG, Chen Z. Simultaneous Observation of the Orientation and Activity of Surface-Immobilized Enzymes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:9133-9140. [PMID: 29993252 DOI: 10.1021/acs.langmuir.8b01657] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Surface immobilized enzymes have been widely used in many applications such as biosensors, biochips, biofuel production, and biofuel cell construction. Many factors dictate how enzymes' structure, activity, and stability may change when immobilized, including surface functionalization, immobilization chemistry, nature of the solid support, and enzyme surface density. To better understand how immobilization affects enzyme structure and activity, we have developed a method to measure both surface-sensitive protein vibrational spectra and enzymatic activity simultaneously. To accomplish this, an optical/fluorescence microscope was incorporated into a sum frequency generation (SFG) spectrometer. Using β-glucosidase (β-Glu) as a model system, enzymes were covalently tethered to a self-assembled monolayer surface using cysteine-maleimide chemistry. Their orientations were determined by SFG spectroscopy, with a single native cysteine residue oriented toward the functionalized surface, and activity measured simultaneously using a fluorogenic substrate resorufin β-d-glucopyranoside, with a loss of activity of 53% as compared to comparable solution measurements. Measuring β-Glu activity and orientation simultaneously provides more accurate information for designing and further improving enzymatic activity of surface-bound enzymes.
Collapse
|
43
|
Abstract
The principles, strengths and limitations of several nonlinear optical (NLO) methods for characterizing biological systems are reviewed. NLO methods encompass a wide range of approaches that can be used for real-time, in-situ characterization of biological systems, typically in a label-free mode. Multiphoton excitation fluorescence (MPEF) is widely used for high-quality imaging based on electronic transitions, but lacks interface specificity. Second harmonic generation (SHG) is a parametric process that has all the virtues of the two-photon version of MPEF, yielding a signal at twice the frequency of the excitation light, which provides interface specificity. Both SHG and MPEF can provide images with high structural contrast, but they typically lack molecular or chemical specificity. Other NLO methods such as coherent anti-Stokes Raman scattering (CARS) and stimulated Raman scattering (SRS) can provide high-sensitivity imaging with chemical information since Raman active vibrations are probed. However, CARS and SRS lack interface and surface specificity. A NLO method that provides both interface/surface specificity as well as molecular specificity is vibrational sum frequency generation (SFG) spectroscopy. Vibration modes that are both Raman and IR active are probed in the SFG process, providing the molecular specificity. SFG, like SHG, is a parametric process, which provides the interface and surface specificity. SFG is typically done in the reflection mode from planar samples. This has yielded rich and detailed information about the molecular structure of biomaterial interfaces and biomolecules interacting with their surfaces. However, 2-D systems have limitations for understanding the interactions of biomolecules and interfaces in the 3-D biological environment. The recent advances made in instrumentation and analysis methods for sum frequency scattering (SFS) now present the opportunity for SFS to be used to directly study biological solutions. By detecting the scattering at angles away from the phase-matched direction even centrosymmetric structures that are isotropic (e.g., spherical nanoparticles functionalized with self-assembled monolayers or biomolecules) can be probed. Often a combination of multiple NLO methods or a combination of a NLO method with other spectroscopic methods is required to obtain a full understanding of the molecular structure and surface chemistry of biomaterials and the biomolecules that interact with them. Using the right combination methods provides a powerful approach for characterizing biological materials.
Collapse
|
44
|
Kelly C, Tullius R, Lapthorn AJ, Gadegaard N, Cooke G, Barron LD, Karimullah AS, Rotello VM, Kadodwala M. Chiral Plasmonic Fields Probe Structural Order of Biointerfaces. J Am Chem Soc 2018; 140:8509-8517. [PMID: 29909628 PMCID: PMC6070957 DOI: 10.1021/jacs.8b03634] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
![]()
The
structural order of biopolymers, such as proteins, at interfaces
defines the physical and chemical interactions of biological systems
with their surroundings and is hence a critical parameter in a range
of biological problems. Known spectroscopic methods for routine rapid
monitoring of structural order in biolayers are generally only applied
to model single-component systems that possess a spectral fingerprint
which is highly sensitive to orientation. This spectroscopic behavior
is not a generic property and may require the addition of a label.
Importantly, such techniques cannot readily be applied to real multicomponent
biolayers, have ill-defined or unknown compositions, and have complex
spectroscopic signatures with many overlapping bands. Here, we demonstrate
the sensitivity of plasmonic fields with enhanced chirality, a property
referred to as superchirality, to global orientational order within
both simple model and “real” complex protein layers.
The sensitivity to structural order is derived from the capability
of superchiral fields to detect the anisotropic nature of electric
dipole–magnetic dipole response of the layer; this is validated
by numerical simulations. As a model study, the evolution of orientational
order with increasing surface density in layers of the antibody immunoglobulin
G was monitored. As an exemplar of greater complexity, superchiral
fields are demonstrated, without knowledge of exact composition, to
be able to monitor how qualitative changes in composition alter the
structural order of protein layers formed from blood serum, thereby
establishing the efficacy of the phenomenon as a tool for studying
complex biological interfaces.
Collapse
Affiliation(s)
- Christopher Kelly
- School of Chemistry , Joseph Black Building, University of Glasgow , Glasgow G12 8QQ , United Kingdom
| | - Ryan Tullius
- School of Chemistry , Joseph Black Building, University of Glasgow , Glasgow G12 8QQ , United Kingdom
| | - Adrian J Lapthorn
- School of Chemistry , Joseph Black Building, University of Glasgow , Glasgow G12 8QQ , United Kingdom
| | - Nikolaj Gadegaard
- School of Engineering , Rankine Building, University of Glasgow , Glasgow G12 8LT , United Kingdom
| | - Graeme Cooke
- School of Chemistry , Joseph Black Building, University of Glasgow , Glasgow G12 8QQ , United Kingdom
| | - Laurence D Barron
- School of Chemistry , Joseph Black Building, University of Glasgow , Glasgow G12 8QQ , United Kingdom
| | - Affar S Karimullah
- School of Chemistry , Joseph Black Building, University of Glasgow , Glasgow G12 8QQ , United Kingdom.,School of Engineering , Rankine Building, University of Glasgow , Glasgow G12 8LT , United Kingdom
| | - Vincent M Rotello
- Department of Chemistry , University of Massachusetts , 710 N. Pleasant Street , Amherst , Massachusetts 01003 , United States
| | - Malcolm Kadodwala
- School of Chemistry , Joseph Black Building, University of Glasgow , Glasgow G12 8QQ , United Kingdom
| |
Collapse
|
45
|
Xiao M, Mohler C, Tucker C, Walther B, Lu X, Chen Z. Structures and Adhesion Properties at Polyethylene/Silica and Polyethylene/Nylon Interfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:6194-6204. [PMID: 29716190 DOI: 10.1021/acs.langmuir.8b00930] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The molecular structures of buried interfaces of maleic anhydride grafted and ungrafted polyethylene films with silica and nylon surfaces were studied in situ using sum-frequency generation (SFG) vibrational spectroscopy. Grafting maleic anhydride to polyethylene altered the molecular structures at buried interfaces, including changing the orientation of polymer methylene groups and resulting in the presence of C═O groups at silica interfaces. These molecular level changes are correlated with enhanced adhesion properties, with ordered C═O groups and in-plane orientation of the methylene groups associated with higher levels of adhesion. While improved adhesion was observed for grafted polyethylene at the nylon interface, no C═O groups were detected at the interface using SFG, for films thermally treated at 185 °C. In this case, either no C═O groups are present at the interface or they are disordered; the latter explanation is more likely, considering the observed improvement in adhesion.
Collapse
Affiliation(s)
- Minyu Xiao
- Department of Chemistry , University of Michigan , Ann Arbor , Michigan 48109 , United States
| | - Carol Mohler
- Core R&D-Formulation Science , The Dow Chemical Company , Midland , Michigan 48674 , United States
| | - Christopher Tucker
- Core R&D-Formulation Science , The Dow Chemical Company , Midland , Michigan 48674 , United States
| | - Brian Walther
- Packaging & Specialty Plastics TS&D F&SP , The Dow Chemical Company , Freeport , Texas 77541 , United States
| | - Xiaolin Lu
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering , Southeast University , Nanjing 210096 , China
| | - Zhan Chen
- Department of Chemistry , University of Michigan , Ann Arbor , Michigan 48109 , United States
| |
Collapse
|
46
|
Lu H, Lutz H, Roeters SJ, Hood MA, Schäfer A, Muñoz-Espí R, Berger R, Bonn M, Weidner T. Calcium-Induced Molecular Rearrangement of Peptide Folds Enables Biomineralization of Vaterite Calcium Carbonate. J Am Chem Soc 2018; 140:2793-2796. [DOI: 10.1021/jacs.8b00281] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Hao Lu
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Helmut Lutz
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | | | - Matthew A. Hood
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Arne Schäfer
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Rafael Muñoz-Espí
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
- Institute
of Materials Science (ICMUV), Universitat de València, C/Catedràtic
José Beltrán 2, 46980 Paterna, Spain
| | - Rüdiger Berger
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Mischa Bonn
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Tobias Weidner
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
- Department
of Chemistry, Aarhus University, 8000 Aarhus C, Denmark
| |
Collapse
|
47
|
Bernhard C, Roeters SJ, Franz J, Weidner T, Bonn M, Gonella G. Repelling and ordering: the influence of poly(ethylene glycol) on protein adsorption. Phys Chem Chem Phys 2018; 19:28182-28188. [PMID: 29022982 DOI: 10.1039/c7cp05445a] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Development of new materials for drug delivery and biosensing requires the fine-tuning of interfacial properties. We report here the influence of the poly(ethylene glycol) (PEG) grafting density in model phospholipid monolayers on the adsorption behavior of bovine serum albumin and human fibrinogen, not only with respect to the amount of adsorbed protein, but also its orientational ordering on the surface. As expected, with increasing interfacial PEG density, the amount of adsorbed protein decreases up to the point where complete protein repellency is reached. However, at intermediate concentrations, the net orientation of adsorbed fibrinogen is highest. The different proteins respond differently to PEG, not only in the amount of protein adsorbed, but also in the manner that proteins adsorb. The results show that for specific cases, tuning the interfacial PEG concentration allows to guide the protein adsorption configuration, a feature sought after in materials for both biosensing and biomedical applications.
Collapse
Affiliation(s)
- Christoph Bernhard
- Max Planck Institute for Polymer Research, Ackermannweg 10, D-55128 Mainz, Germany.
| | | | | | | | | | | |
Collapse
|
48
|
Xiao M, Jasensky J, Foster L, Kuroda K, Chen Z. Monitoring Antimicrobial Mechanisms of Surface-Immobilized Peptides in Situ. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:2057-2062. [PMID: 29332402 DOI: 10.1021/acs.langmuir.7b03668] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Antimicrobial peptides (AMPs) in free solution can kill bacteria by disrupting bacterial cell membranes. Their modes of action have been extensively studied, and various models ranging from pore formation to carpet-like mechanisms were proposed. Surface-immobilized AMPs have been used as coatings to kill bacteria and as sensors to capture bacteria, but the interaction mechanisms of surface-immobilized AMPs and bacteria are not fully understood. In this research, an analytical platform, sum frequency generation (SFG) microscope, which is composed of an SFG vibrational spectrometer and a fluorescence microscope, was used to probe molecular interactions between surface-immobilized AMPs and bacteria in situ in real time at the solid/liquid interface. SFG probed the molecular structure of surface-immobilized AMPs while interacting with bacteria, and fluorescence images of dead bacteria were monitored as a function of time during the peptide-bacteria interaction. It was believed that upon bacteria contact, the surface-immobilized peptides changed their orientation and killed bacteria. This research demonstrated that the SFG microscope platform can examine the structure and function (bacterial killing) at the same time in the same sample environment, providing in-depth understanding on the structure-activity relationships of surface-immobilized AMPs.
Collapse
Affiliation(s)
- Minyu Xiao
- Department of Chemistry, ‡Macromolecular Science and Engineering Center, and §Department of Biologic and Materials Sciences, School of Dentistry, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Joshua Jasensky
- Department of Chemistry, ‡Macromolecular Science and Engineering Center, and §Department of Biologic and Materials Sciences, School of Dentistry, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Leanna Foster
- Department of Chemistry, ‡Macromolecular Science and Engineering Center, and §Department of Biologic and Materials Sciences, School of Dentistry, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Kenichi Kuroda
- Department of Chemistry, ‡Macromolecular Science and Engineering Center, and §Department of Biologic and Materials Sciences, School of Dentistry, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Zhan Chen
- Department of Chemistry, ‡Macromolecular Science and Engineering Center, and §Department of Biologic and Materials Sciences, School of Dentistry, University of Michigan , Ann Arbor, Michigan 48109, United States
| |
Collapse
|
49
|
Li Y, Pan D, Nashine V, Deshmukh S, Vig B, Chen Z. Understanding Protein-Interface Interactions of a Fusion Protein at Silicone Oil-Water Interface Probed by Sum Frequency Generation Vibrational Spectroscopy. J Pharm Sci 2018; 107:682-689. [DOI: 10.1016/j.xphs.2017.09.029] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2017] [Revised: 08/29/2017] [Accepted: 09/27/2017] [Indexed: 11/16/2022]
|
50
|
Bian HT, Guo Y, Wang HF. Non-parabolic potential dependence of optical second harmonic generation from the Si(111) electrode/electrolyte interface. Phys Chem Chem Phys 2018; 20:29539-29548. [DOI: 10.1039/c8cp05621h] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
We performed potential dependent second harmonic generation (SHG) measurements on the Si(111) electrolyte interface at different azimuthal angles and for different polarization combinations.
Collapse
Affiliation(s)
- Hong-tao Bian
- Key Laboratory of Applied Surface and Colloid Chemistry
- Ministry of Education
- School of Chemistry and Chemical Engineering
- Shaanxi Normal University
- Xi'an
| | - Yuan Guo
- Beijing National Laboratory for Molecular Sciences
- State Key Laboratory of Molecular Reaction Dynamics
- Institute of Chemistry
- Chinese Academy of Sciences
- University of Chinese Academy of Sciences
| | - Hong-fei Wang
- Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials
- Fudan University
- Shanghai
- China
| |
Collapse
|