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Mustafa R, Fitian M, Hamilton NB, Li J, Silva WR, Punihaole D. Molecular Insights into the Binding of Linear Polyethylenimines and Single-Stranded DNA Using Raman Spectroscopy: A Quantitative Approach. J Phys Chem B 2022; 126:8404-8414. [PMID: 36222425 PMCID: PMC10413332 DOI: 10.1021/acs.jpcb.2c04939] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Establishing how polymeric vectors such as polyethylenimine (PEI) bind and package their nucleic acid cargo is vital toward developing more efficacious and cost-effective gene therapies. To develop a molecular-level picture of DNA binding, we examined how the Raman spectra of PEIs report on their local chemical environment. We find that the intense Raman bands located in the 1400-1500 cm-1 region derive from vibrations with significant CH2 scissoring and NH bending character. The Raman bands that derive from these vibrations show profound intensity changes that depend on both the local dielectric environment and hydrogen bonding interactions with the secondary amine groups on the polymer. We use these bands as spectroscopic markers to assess the binding between low molecular weight PEIs and single-stranded DNA (ssDNA). Analysis of the Raman spectra suggest that PEI primarily binds via electrostatic interactions to the phosphate backbone, which induces the condensation of the ssDNA. We additionally confirm this finding by conducting molecular dynamics simulations. We expect that the spectral correlations determined here will enable future studies to investigate important gene delivery activities, including how PEI interacts with cellular membranes to facilitate cargo internalization into cells.
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Affiliation(s)
- Rusul Mustafa
- Department of Chemistry, University of Vermont, Burlington, Vermont05405, United States
| | - Maria Fitian
- Department of Chemistry and Biochemistry, Siena College, Loudonville, New York12211, United States
| | - Nicholas B Hamilton
- Department of Chemistry, University of Vermont, Burlington, Vermont05405, United States
| | - Jianing Li
- Department of Chemistry, University of Vermont, Burlington, Vermont05405, United States
| | - W Ruchira Silva
- Department of Chemistry and Biochemistry, Siena College, Loudonville, New York12211, United States
| | - David Punihaole
- Department of Chemistry, University of Vermont, Burlington, Vermont05405, United States
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Tian KZ, Cao CC, Nie XM, Wang W, Han CQ. Sensitive and label-free detection of protein secondary structure by amide III spectral signals using surface-enhanced Raman spectroscopy. CHINESE J CHEM PHYS 2019. [DOI: 10.1063/1674-0068/cjcp1811267] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Kang-zhen Tian
- Jiangsu Key Laboratory of Advanced Laser Materials and Devices, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116, China
| | - Chang-chun Cao
- The 95979 Army of Chinese People’s Liberation Army, Taian 271200, China
| | - Xin-ming Nie
- Jiangsu Key Laboratory of Advanced Laser Materials and Devices, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116, China
| | - Wen Wang
- Jiangsu Key Laboratory of Advanced Laser Materials and Devices, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116, China
| | - Cai-qin Han
- Jiangsu Key Laboratory of Advanced Laser Materials and Devices, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116, China
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Self-Assembled Nanoscaled Metalloporphyrin for Optical Detection of Dimethylmethylphosphonate. BIOMED RESEARCH INTERNATIONAL 2019; 2019:7689183. [PMID: 31011578 PMCID: PMC6442447 DOI: 10.1155/2019/7689183] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/30/2018] [Revised: 12/04/2018] [Accepted: 01/13/2019] [Indexed: 01/30/2023]
Abstract
The self-assembly approach has been widely adopted in the effort to design and prepare functional materials. Herein, we report the synthesis and optical properties of metalloporphyrin nanoparticles. Nanoscaled particles of 5,10,15,20-tetraphenylporphyrin manganese (MnTPP) and 5,10,15,20-tetraphenylporphyrin indium (InTPP) were produced in the water/dimethylsulfoxide (DMSO) mixed solution by self-assembly approach. The absorbance intensity at the characteristic peak of the monomeric and nanoscaled metalloporphyrins decreased when they interact with dimethylmethylphosphonate (DMMP). Detection limits of MnTPP and InTPP nanoparticles to DMMP were 10−9 and 10−10 L/L, respectively, and detection limits of monomeric MnTPP and InTPP to DMMP were 10−6 and 10−7 L/L, respectively. Density functional theory (DFT) calculations on MnTPP and InTPP with DMMP as axial ligands had been performed in the B3LYP/6-31g (d) approximation. Their optimized geometries and binding energies were found to depend very strongly on the central metal ion, and InTPP was more sensitive for DMMP detection in contract to MnTPP. All the experimental and theoretical results demonstrated that nanoscaled metalloporphyrin have potential prospects in determination for public safety.
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Punihaole D, Workman RJ, Upadhyay S, Bruggen CV, Schmitz AJ, Reineke TM, Frontiera RR. New Insights into Quinine-DNA Binding Using Raman Spectroscopy and Molecular Dynamics Simulations. J Phys Chem B 2018; 122:9840-9851. [PMID: 30336027 PMCID: PMC6425490 DOI: 10.1021/acs.jpcb.8b05795] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Quinine's ability to bind DNA and potentially inhibit transcription and translation has been examined as a mode of action for its antimalarial activity. UV absorption and fluorescence-based studies have lacked the chemical specificity to develop an unambiguous molecular-level picture of the binding interaction. To address this, we use Raman spectroscopy and molecular dynamics (MD) to investigate quinine-DNA interactions. We demonstrate that quinine's strongest Raman band in the fingerprint region, which derives from a symmetric stretching mode of the quinoline ring, is highly sensitive to the local chemical environment and pH. The frequency shifts observed for this mode in solvents of varying polarity can be explained in terms of the Stark effect using a simple Onsager solvation model, indicating that the vibration reports on the local electrostatic environment. However, specific chemical interactions between the quinoline ring and its environment, such as hydrogen bonding and π-stacking, perturb the frequency of this mode in a more complicated but predictable manner. We use this vibration as a spectroscopic probe to investigate the binding interaction between quinine and DNA. We find that, when the quinoline ring is protonated, quinine weakly intercalates into DNA by forming π-stacking interactions with the base pairs. The Raman spectra indicate that quinine can intercalate into DNA with a ratio reaching up to roughly one molecule per 25 base pairs. Our results are confirmed by MD simulations, which also show that the quinoline ring adopts a t-shaped π-stacking geometry with the DNA base pairs, whereas the quinuclidine head group weakly interacts with the phosphate backbone in the minor groove. We expect that the spectral correlations determined here will enable future studies to probe quinine's antimalarial activities, such as disrupting hemozoin biocrystallization, which is hypothesized to be, among other things, one of its primary modes of action against Plasmodium parasites.
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Affiliation(s)
- David Punihaole
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Riley J. Workman
- Department of Chemistry and Biochemistry, Center for Computational Sciences, Duquesne University, Pittsburgh, Pennsylvania 15282, United States
| | - Shiv Upadhyay
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Craig Van Bruggen
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Andrew J. Schmitz
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Theresa M. Reineke
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Renee R. Frontiera
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
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Abstract
UV resonance Raman (UVRR) spectroscopy is a powerful tool for investigating the structure of biological molecules, such as proteins. Numerous UVRR spectroscopic markers that provide information on the structure and environment of the protein backbone and of amino acid side chains have recently been discovered. Combining these UVRR markers with hydrogen-deuterium exchange and advanced statistics is a powerful tool for studying protein systems, including the structure and formation mechanism of protein aggregates and amyloid fibrils. These techniques allow crucial new insights into the structure and dynamics of proteins, such as polyglutamine peptides, which are associated with 10 different neurodegenerative diseases. Here we summarize the spectroscopic structural markers recently developed and the important insights they provide.
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Meng X, He M, Guo R, Duan R, Huo F, Lv C, Wang B, Zhang S. Investigation of the Effect of the Degree of Processing of Radix Rehmanniae Preparata (Shu Dihuang) on Shu Dihuangtan Carbonization Preparation Technology. Molecules 2017; 22:E1193. [PMID: 28718784 PMCID: PMC6152270 DOI: 10.3390/molecules22071193] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2017] [Revised: 07/13/2017] [Accepted: 07/13/2017] [Indexed: 11/16/2022] Open
Abstract
Carbonization of Radix Rehmanniae Preparata (Shu Dihuangtan) via stir-frying could increase its homeostasis maintaining and antidiarrheal effects. To ensure these pharmacological functions, the quality of the raw material (processed Rehmanniae Radix) must be well controlled. Therefore, we analyzed the effects of different degrees of processing and adjuvants on processed Rehmanniae Radix (Shu Dihuang) by High Performance Liquid Chromatography (HPLC) chromatographic fingerprints, thermal gravimetric analysis and Fourier transform infrared spectroscopy (FTIR). Based on the results from HPLC fingerprints combined with similarity analysis (SA) and hierarchical cluster analysis (HCA) the optimum processing method for Shu Dihuang was five cycles of steaming and polishing, which follows the ancient processing theory. The intensity of thermal weight loss rate peaked near 210.33 ± 4.32 °C or 211.33 ± 2.62 °C, which was an important indicator for the degree of processing of Shu Dihuang. A temperature near 290.89 ± 2.51 °C was the upper limit for carbonizing Shu Dihuangtan. FTIR spectroscopy analysis showed that the overall chemical composition of Shu Dihuangtan was affected by both the degree of processing and adjuvant, which are very important for its quality.
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Affiliation(s)
- Xianglong Meng
- Department of Herbology, College of Korean Medicine, Dongguk University, 38066 Gyeongju, Korea.
- Institute of Pharmaceutical & Food Engineering and College of Chinese Materia Medica, Shanxi University of Chinese Medicine, Jinzhong 030619, Shanxi, China.
| | - Meijing He
- Institute of Pharmaceutical & Food Engineering and College of Chinese Materia Medica, Shanxi University of Chinese Medicine, Jinzhong 030619, Shanxi, China.
| | - Rui Guo
- Institute of Pharmaceutical & Food Engineering and College of Chinese Materia Medica, Shanxi University of Chinese Medicine, Jinzhong 030619, Shanxi, China.
| | - Rui Duan
- Institute of Pharmaceutical & Food Engineering and College of Chinese Materia Medica, Shanxi University of Chinese Medicine, Jinzhong 030619, Shanxi, China.
| | - Fengxian Huo
- Institute of Pharmaceutical & Food Engineering and College of Chinese Materia Medica, Shanxi University of Chinese Medicine, Jinzhong 030619, Shanxi, China.
| | - Chenzi Lv
- Institute of Pharmaceutical & Food Engineering and College of Chinese Materia Medica, Shanxi University of Chinese Medicine, Jinzhong 030619, Shanxi, China.
| | - Bo Wang
- Institute of Pharmaceutical & Food Engineering and College of Chinese Materia Medica, Shanxi University of Chinese Medicine, Jinzhong 030619, Shanxi, China.
| | - Shuosheng Zhang
- Institute of Pharmaceutical & Food Engineering and College of Chinese Materia Medica, Shanxi University of Chinese Medicine, Jinzhong 030619, Shanxi, China.
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Punihaole D, Workman RJ, Hong Z, Madura JD, Asher SA. Polyglutamine Fibrils: New Insights into Antiparallel β-Sheet Conformational Preference and Side Chain Structure. J Phys Chem B 2016; 120:3012-26. [PMID: 26947327 DOI: 10.1021/acs.jpcb.5b11380] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Understanding the structure of polyglutamine (polyQ) amyloid-like fibril aggregates is crucial to gaining insights into the etiology of at least ten neurodegenerative disorders, including Huntington's disease. Here, we determine the structure of D2Q10K2 (Q10) fibrils using ultraviolet resonance Raman (UVRR) spectroscopy and molecular dynamics (MD). Using UVRR, we determine the fibril peptide backbone Ψ and glutamine (Gln) side chain χ3 dihedral angles. We find that most of the fibril peptide bonds adopt antiparallel β-sheet conformations; however, a small population of peptide bonds exist in parallel β-sheet structures. Using MD, we simulate three different potential fibril structural models that consist of either β-strands or β-hairpins. Comparing the experimentally measured Ψ and χ3 angle distributions to those obtained from the MD simulated models, we conclude that the basic structural motif of Q10 fibrils is an extended β-strand structure. Importantly, we determine from our MD simulations that Q10 fibril antiparallel β-sheets are thermodynamically more stable than parallel β-sheets. This accounts for why polyQ fibrils preferentially adopt antiparallel β-sheet conformations instead of in-register parallel β-sheets like most amyloidogenic peptides. In addition, we directly determine, for the first time, the structures of Gln side chains. Our structural data give new insights into the role that the Gln side chains play in the stabilization of polyQ fibrils. Finally, our work demonstrates the synergistic power and utility of combining UVRR measurements and MD modeling to determine the structure of amyloid-like fibrils.
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Affiliation(s)
- David Punihaole
- Department of Chemistry, University of Pittsburgh , Pittsburgh, Pennsylvania 15260, United States
| | - Riley J Workman
- Department of Chemistry and Biochemistry, Center for Computational Sciences, Duquesne University , Pittsburgh, Pennsylvania 15282, United States
| | - Zhenmin Hong
- Department of Chemistry, University of Pittsburgh , Pittsburgh, Pennsylvania 15260, United States
| | - Jeffry D Madura
- Department of Chemistry and Biochemistry, Center for Computational Sciences, Duquesne University , Pittsburgh, Pennsylvania 15282, United States
| | - Sanford A Asher
- Department of Chemistry, University of Pittsburgh , Pittsburgh, Pennsylvania 15260, United States
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8
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A computational approach to the resonance Raman spectrum of doxorubicin in aqueous solution. Theor Chem Acc 2016. [DOI: 10.1007/s00214-015-1781-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Punihaole D, Hong Z, Jakubek RS, Dahlburg EM, Geib S, Asher SA. Glutamine and Asparagine Side Chain Hyperconjugation-Induced Structurally Sensitive Vibrations. J Phys Chem B 2015; 119:13039-51. [PMID: 26392216 PMCID: PMC5065012 DOI: 10.1021/acs.jpcb.5b07651] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We identified vibrational spectral marker bands that sensitively report on the side chain structures of glutamine (Gln) and asparagine (Asn). Density functional theory (DFT) calculations indicate that the Amide III(P) (AmIII(P)) vibrations of Gln and Asn depend cosinusoidally on their side chain OCCC dihedral angles (the χ3 and χ2 angles of Gln and Asn, respectively). We use UV resonance Raman (UVRR) and visible Raman spectroscopy to experimentally correlate the AmIII(P) Raman band frequency to the primary amide OCCC dihedral angle. The AmIII(P) structural sensitivity derives from the Gln (Asn) Cβ-Cγ (Cα-Cβ) stretching component of the vibration. The Cβ-Cγ (Cα-Cβ) bond length inversely correlates with the AmIII(P) band frequency. As the Cβ-Cγ (Cα-Cβ) bond length decreases, its stretching force constant increases, which results in an upshift in the AmIII(P) frequency. The Cβ-Cγ (Cα-Cβ) bond length dependence on the χ3 (χ2) dihedral angle results from hyperconjugation between the Cδ═Oϵ (Cγ═Oδ) π* and Cβ-Cγ (Cα-Cβ) σ orbitals. Using a Protein Data Bank library, we show that the χ3 and χ2 dihedral angles of Gln and Asn depend on the peptide backbone Ramachandran angles. We demonstrate that the inhomogeneously broadened AmIII(P) band line shapes can be used to calculate the χ3 and χ2 angle distributions of peptides. The spectral correlations determined in this study enable important new insights into protein structure in solution, and in Gln- and Asn-rich amyloid-like fibrils and prions.
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Affiliation(s)
- David Punihaole
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Chevron Science Center, Pittsburgh, Pennsylvania 15260, United States
| | - Zhenmin Hong
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Chevron Science Center, Pittsburgh, Pennsylvania 15260, United States
| | - Ryan S. Jakubek
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Chevron Science Center, Pittsburgh, Pennsylvania 15260, United States
| | - Elizabeth M. Dahlburg
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Chevron Science Center, Pittsburgh, Pennsylvania 15260, United States
| | - Steven Geib
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Chevron Science Center, Pittsburgh, Pennsylvania 15260, United States
| | - Sanford A. Asher
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Chevron Science Center, Pittsburgh, Pennsylvania 15260, United States
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Decandio CC, Silva ER, Hamley IW, Castelletto V, Liberato MS, Oliveira VX, Oliveira CLP, Alves WA. Self-Assembly of a Designed Alternating Arginine/Phenylalanine Oligopeptide. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:4513-23. [PMID: 25823528 DOI: 10.1021/acs.langmuir.5b00253] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
A model octapeptide peptide consisting of an alternating sequence of arginine (Arg) and phenylalanine (Phe) residues, namely, [Arg-Phe]4, was prepared, and its self-assembly in solution studied. The simple alternating [Arg-Phe]4 peptide sequence allows for unique insights into the aggregation process and the structure of the self-assembled motifs. Fluorescence and UV-vis assays were used to determine critical aggregation concentrations, corresponding to the formation of oligomeric species and β-sheet rich structures organized into both spheroidal aggregates and highly ordered fibrils. Electron and atomic force microscopy images show globular aggregates and long unbranched fibers with diameters ranging from ∼4 nm up to ∼40 nm. Infrared and circular dichroism spectroscopy show the formation of β-sheet structures. X-ray diffraction on oriented stalks show that the peptide fibers have an internal lamellar structure, with an orthorhombic unit cell with parameters a ∼ 27.6 Å, b ∼ 9.7 Å, and c ∼ 9.6 Å. In situ small-angle X-ray scattering (SAXS) shows the presence of low molecular weight oligomers in equilibrium with mature fibers which are likely made up from 5 or 6 intertwined protofilaments. Finally, weak gel solutions are probed under gentle shear, suggesting the ability of these arginine-rich fibers to form networks.
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Affiliation(s)
- Carla C Decandio
- †Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Santo André 09210-580, Brazil
| | - Emerson R Silva
- †Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Santo André 09210-580, Brazil
- ‡Department of Chemistry, University of Reading, Whiteknights, Reading RG6 6AD, United Kingdom
| | - Ian W Hamley
- ‡Department of Chemistry, University of Reading, Whiteknights, Reading RG6 6AD, United Kingdom
| | - Valeria Castelletto
- ‡Department of Chemistry, University of Reading, Whiteknights, Reading RG6 6AD, United Kingdom
| | - Michelle S Liberato
- †Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Santo André 09210-580, Brazil
| | - Vani X Oliveira
- †Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Santo André 09210-580, Brazil
| | | | - Wendel A Alves
- †Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Santo André 09210-580, Brazil
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Punihaole D, Jakubek RS, Dahlburg EM, Hong Z, Myshakina NS, Geib S, Asher SA. UV resonance Raman investigation of the aqueous solvation dependence of primary amide vibrations. J Phys Chem B 2015; 119:3931-9. [PMID: 25667957 PMCID: PMC5065019 DOI: 10.1021/jp511356u] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We investigated the normal mode composition and the aqueous solvation dependence of the primary amide vibrations of propanamide. Infrared, normal Raman, and UV resonance Raman (UVRR) spectroscopy were applied in conjunction with density functional theory (DFT) to assign the vibrations of crystalline propanamide. We examined the aqueous solvation dependence of the primary amide UVRR bands by measuring spectra in different acetonitrile/water mixtures. As previously observed in the UVRR spectra of N-methylacetamide, all of the resonance enhanced primary amide bands, except for the Amide I (AmI), show increased UVRR cross sections as the solvent becomes water-rich. These spectral trends are rationalized by a model wherein the hydrogen bonding and the high dielectric constant of water stabilizes the ground state dipolar (-)O-C═NH2(+) resonance structure over the neutral O═C-NH2 resonance structure. Thus, vibrations with large C-N stretching show increased UVRR cross sections because the C-N displacement between the electronic ground and excited state increases along the C-N bond. In contrast, vibrations dominated by C═O stretching, such as the AmI, show a decreased displacement between the electronic ground and excited state, which result in a decreased UVRR cross section upon aqueous solvation. The UVRR primary amide vibrations can be used as sensitive spectroscopic markers to study the local dielectric constant and hydrogen bonding environments of the primary amide side chains of glutamine (Gln) and asparagine (Asn).
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Affiliation(s)
- David Punihaole
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Ryan S. Jakubek
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Elizabeth M. Dahlburg
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Zhenmin Hong
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Nataliya S. Myshakina
- Science Department, Chatham University, Pittsburgh, Pennsylvania 15232, United States
| | - Steven Geib
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Sanford A. Asher
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
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Lanza G, Chiacchio MA. Ab Initio MP2 and Density Functional Theory Computational Study of AcAlaNH2Peptide Hydration: A Bottom-Up Approach. Chemphyschem 2014; 15:2785-93. [DOI: 10.1002/cphc.201402222] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2014] [Indexed: 01/15/2023]
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13
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Cai Z, Zhang JT, Xue F, Hong Z, Punihaole D, Asher SA. 2D Photonic Crystal Protein Hydrogel Coulometer for Sensing Serum Albumin Ligand Binding. Anal Chem 2014; 86:4840-7. [DOI: 10.1021/ac404134t] [Citation(s) in RCA: 79] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Zhongyu Cai
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Jian-Tao Zhang
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Fei Xue
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Zhenmin Hong
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - David Punihaole
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Sanford A. Asher
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
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