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Hassabo AA, Abdelraof M, Allam RM. L-arginase from Streptomyces diastaticus MAM5 as a potential therapeutic agent in breast cancer: Purification, characterization, G1 phase arrest and autophagy induction. Int J Biol Macromol 2022; 224:634-645. [DOI: 10.1016/j.ijbiomac.2022.10.152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2022] [Revised: 10/10/2022] [Accepted: 10/17/2022] [Indexed: 11/05/2022]
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2
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Mechanism of low-salt surimi gelation induced by microwave heating combined with l-arginine and transglutaminase: On the basis of molecular docking between l-arginine and myosin heavy chain. Food Chem 2022; 391:133184. [DOI: 10.1016/j.foodchem.2022.133184] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2021] [Revised: 04/08/2022] [Accepted: 05/06/2022] [Indexed: 11/22/2022]
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3
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Lu L, Li RZ, Xu XY. Interaction of Cysteine with Li + and LiF in the Presence of (H 2O) n ( n = 0-6) Clusters. ACS OMEGA 2022; 7:18646-18659. [PMID: 35694486 PMCID: PMC9178773 DOI: 10.1021/acsomega.2c01315] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/04/2022] [Accepted: 05/19/2022] [Indexed: 06/15/2023]
Abstract
The interaction between cysteine with Li+ and LiF in the microcosmic water environment was investigated to elucidate how ions interact with amino acids and the cation-anion correlation effect involved. The structures of Cys·Li+(H2O) n and Cys·LiF(H2O) n (n = 0-6) were characterized using ab initio calculations. Our studies show that the water preferentially interacts with Li+/LiF. In Cys·Li+(H2O)0-6, Li+ interacts with amino nitrogen, carbonyl oxygen, and hydrophobic sulfur of Cys to form a tridentate mode, whereas in Cys·LiF(H2O) n , Li+ and F- work in cooperation and interact with carbonyl oxygen and hydroxyl hydrogen of Cys to form a bidentate type. The neutral and zwitterionic forms are essentially isoenergetic when the water number reaches three in the presence of Li+, whereas this occurs at four water molecules in the presence of LiF. Further research revealed that the interaction between Li+/LiF and Cys was mainly electrostatic, followed by dispersion, and the weakest interaction occurs at the transition from the neutral form to zwitterionic form. Natural population analysis charge analyses show that for Cys·Li+(H2O) n , the positive charge is mostly concentrated on Li+ except for the system containing three water molecules. For Cys·LiF(H2O) n , the positive charge is centered on the LiF unit in the range n = 0-6, and at n = 5, electron transfer from Cys to water occurs. Our study shows that the contribution of anions in zwitterionic state stabilization should be addressed more generally along with cations.
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Zhao J, Dong T, Yu P, Wang J. Conformation and Metal Cation Binding of Zwitterionic Alanine Tripeptide in Saline Solutions by Infrared Vibrational Spectroscopy and Molecular Dynamics Simulations. J Phys Chem B 2021; 126:161-173. [PMID: 34968072 DOI: 10.1021/acs.jpcb.1c10034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In this work, linear infrared (IR) spectroscopy and molecular dynamics (MD) simulations were used to examine the interaction of different metal cations (Na+, Ca2+, Mg2+, and Zn2+) with backbone (amide C═O) and C-terminal carboxylate (COO-) groups in zwitterionic alanine tripeptide (Ala3) in aqueous solutions with varying saline concentrations. Circular dichroism spectra and MD results suggest that Ala3 is predominantly in polyproline-II (PPII) conformation, whose amide-I and asymmetric carboxylate stretching IR vibration signatures are also supported by quantum-chemistry calculations. The zwitterionic form of Ala3 separates the two amide-I modes in frequency, which are weakly coupled modes, as revealed by two-dimensional IR measurement, and can be used to probe backbone-cation interactions at different scenarios (near charged or neutral chemical groups respectively). Cation concentration-dependent IR frequency red shifts in the amide-I mode are seen for both amide-I modes, whereas blue shifts are also seen in the amide-I mode far from the NH3+ group. The observed spectral changes are discussed from the perspective of the salting-in and salting-out abilities of the cations. In addition, all the metal cations studied here (except Zn2+) can specifically coordinate to the COO- group in bidentate and pseudo-bridging forms simultaneously. For Zn2+, only the pseudo-bridging form exists. Our results shed light on the macroscopic protein salting-in and salting-out phenomena from the perspective of key chemical bonds in peptides.
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Affiliation(s)
- Juan Zhao
- Molecular Reaction Dynamics Laboratory, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China.,University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Tiantian Dong
- Molecular Reaction Dynamics Laboratory, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China.,University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Pengyun Yu
- Molecular Reaction Dynamics Laboratory, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China.,University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Jianping Wang
- Molecular Reaction Dynamics Laboratory, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China.,University of Chinese Academy of Sciences, Beijing 100049, P. R. China
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Mei S, Shi J, Zhang S, Wang Y, Wu Y, Jiang Z, Wu H. Nanoporous Phyllosilicate Assemblies for Enzyme Immobilization. ACS APPLIED BIO MATERIALS 2019; 2:777-786. [DOI: 10.1021/acsabm.8b00642] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Shuang Mei
- Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China
| | - Jiafu Shi
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China
- School of Environment Science and Engineering, Tianjin University, Tianjin 300072, China
| | - Shaohua Zhang
- Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China
| | - Yue Wang
- Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
| | - Yizhou Wu
- Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China
| | - Zhongyi Jiang
- Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China
| | - Hong Wu
- Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China
- Tianjin Key Laboratory of Membrane Science and Desalination Technology, Tianjin University, Tianjin 300072, China
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Rodríguez SJ, Albanesi EA. Electronic transport in a graphene single layer: application in amino acid sensing. Phys Chem Chem Phys 2019; 21:597-606. [PMID: 30543232 DOI: 10.1039/c8cp05093g] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
We modeled a type of field-effect transistor device based on graphene for the recognition of amino acids with a potential application in the building of a protein sequencer. The theoretical model used was a combination of density functional theory (DFT) with the non-equilibrium Green's function (NEGF) in order to describe the coherent transport in molecular devices. First, we studied the physisorption of each amino acid on a graphene sheet and we reported the adsorption energy, the adsorption distances, the equilibrium configuration and the charge transfer of ten amino acids that can be considered as representative of all of the amino acids: histidine (His), alanine (Ala), aspartic acid (Asp), tyrosine (Tyr), arginine (Arg), glutamic acid (Glu), glycine (Gly), phenylalanine (Phe), proline (Pro) and lysine (Lys). As a result, significant differences were found in the density of states (DOS) after adsorption and there was a change in the semi-metallic character of the graphene due to the lysine and arginine interactions. Furthermore, we noticed changes in the electrical characteristics of the devices, as the amino acids adsorbed onto the surface of the graphene. The curves of current vs. bias voltage (I-Vb) display a distinct response for each amino acid, i.e. the I-Vb curves produce a characteristic footprint for each amino acid. We identified a possible rectification mechanism related to the voltage profile asymmetry, where the amino acids can control the transport characteristics in the device, i.e. Lys and Phe amino acids physisorbed on graphene act as a molecular diode, where electrons can easily flow in one direction and decrease in the other. This may be promising for the prospect of biosensors: graphene could be used as an amino acid detector.
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Affiliation(s)
- Sindy J Rodríguez
- Instituto de Física del Litoral (CONICET-UNL), Güemes 3450, Santa Fe, Argentina.
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Xu L, Liu W, Cai Y, Wu C, Chen L, Yang S, Wang X, Ji G, Wang S. Competitive sequestration of Ni(II) and Eu(III) on montmorillonite: role of molar Ni:Eu ratios and coexisting oxalate. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:32617-32630. [PMID: 30242655 DOI: 10.1007/s11356-018-3252-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2018] [Accepted: 09/14/2018] [Indexed: 06/08/2023]
Abstract
The competitive binding trends of Ni(II) and Eu(III) on montmorillonite in the absence/presence of Na-oxalate are explored by using batch sorption/desorption technique, speciation modeling, and X-ray diffraction (XRD) analysis. With a series of molar Ni:Eu ratios (i.e., 1:1, 5:1, 10:1, 1:5, and 1:10), the coexisting Ni(II) did not affect the sequestration behaviors and immobilization mechanisms of Eu(III). In contrast, the presence of Eu(III) obviously suppressed the sorption percentages of Ni(II) in the acidic pH range. Even though no obvious influence of Eu(III) on the macroscopic binding trends of Ni(II) was observed under alkaline conditions, the fraction of Ni(II) adsorbed by the inner-sphere complexation mechanism decreased and that of Ni(II) precipitation increased with rising molar Ni:Eu ratio. The coexisting Na-oxalate did not influence Eu(III) sorption, while inhibited the sorption of Ni(II). The XRD analysis indicated the potential formation of two Eu-oxalate precipitate phases (i.e., Eu2(C2O4)3·xH2O(s)-1 and Eu2(C2O4)3·xH2O(s)-2) at different pH values (4.0 and 6.5) and Na-oxalate concentrations (ranging from 0.5 to 5.0 mM). Interestingly, the Eu2(C2O4)3·xH2O(s)-2 phase would be transformed into the Eu2(C2O4)3·xH2O(s)-1 solid with the increase of Na-oxalate concentration. The research findings could provide essential data for evaluating the fate of coexistent Eu(III) and Ni(II) in the complicated aquatic environment.
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Affiliation(s)
- Lin Xu
- State Key Laboratory of Radiation Medicine and Protection, School for Radiological and interdisciplinary Sciences (RAD-X) and Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions, Soochow University, Suzhou, 215123, People's Republic of China
| | - Wei Liu
- State Key Laboratory of Radiation Medicine and Protection, School for Radiological and interdisciplinary Sciences (RAD-X) and Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions, Soochow University, Suzhou, 215123, People's Republic of China
| | - Yawen Cai
- State Key Laboratory of Radiation Medicine and Protection, School for Radiological and interdisciplinary Sciences (RAD-X) and Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions, Soochow University, Suzhou, 215123, People's Republic of China
| | - Chunfang Wu
- State Key Laboratory of Radiation Medicine and Protection, School for Radiological and interdisciplinary Sciences (RAD-X) and Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions, Soochow University, Suzhou, 215123, People's Republic of China
| | - Lei Chen
- State Key Laboratory of Radiation Medicine and Protection, School for Radiological and interdisciplinary Sciences (RAD-X) and Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions, Soochow University, Suzhou, 215123, People's Republic of China
| | - Shitong Yang
- State Key Laboratory of Radiation Medicine and Protection, School for Radiological and interdisciplinary Sciences (RAD-X) and Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions, Soochow University, Suzhou, 215123, People's Republic of China.
- Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan.
| | - Xiangke Wang
- State Key Laboratory of Radiation Medicine and Protection, School for Radiological and interdisciplinary Sciences (RAD-X) and Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions, Soochow University, Suzhou, 215123, People's Republic of China
- School of Environment and Chemical Engineering, North China Electric Power University, Beijing, 102206, People's Republic of China
| | - Guoxun Ji
- Xi'an Research Institute of Hi-Technology, Hong Qing Town, Xi'an, 710025, People's Republic of China.
| | - Shuao Wang
- State Key Laboratory of Radiation Medicine and Protection, School for Radiological and interdisciplinary Sciences (RAD-X) and Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions, Soochow University, Suzhou, 215123, People's Republic of China.
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8
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Yoshinari N, Yamashita S, Fukuda Y, Nakazawa Y, Konno T. Mobility of hydrated alkali metal ions in metallosupramolecular ionic crystals. Chem Sci 2018; 10:587-593. [PMID: 30746100 PMCID: PMC6335618 DOI: 10.1039/c8sc04204g] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2018] [Accepted: 10/20/2018] [Indexed: 01/13/2023] Open
Abstract
The ion-conducting behaviour of alkali metal ions in ionic solids (M6[1]·nH2O) resembles that in aqueous solutions; the solid-state conductivities increase in the order of M = Li+ < Na+ < K+.
The design and creation of ionic crystals that show high mobility of ionic species in the solid state has long been a research topic of considerable attention not only due to the practical applications of these materials but also due to the correlation of such ionic species with ion-transport biological systems. In this work, we report the mobility of alkali metal ions (M = Li+, Na+, K+) in the ionic crystals M6[Rh4Zn4O (l-cysteinate)12]·nH2O (M6[1]·nH2O). In M6[1]·nH2O, alkali metal ions are distributed in a disordered manner, together with a number of water molecules, within a rigid hydrogen-bonded framework of anionic clusters of [1]6–. The alternating current conductivities of M6[1]·nH2O in the solid state increase in the order of Li6[1]·nH2O < Na6[1]·nH2O < K6[1]·nH2O, which is opposite to the order of the naked ionic radii. The conductivities reach the superionic level of σ = 1.3 × 10–2 S cm–1 at 300 K for a single crystal of K6[1]·nH2O. These results reflect the high mobility of hydrated alkali metal ions in the crystal lattice of M6[1]·nH2O, which is supported by solid-state NMR spectroscopy, together with ion diffusion experiments in the solid state. The high mobility leads to quick exchange of K+ ions in K6[1]·nH2O with Li+ and Na+ ions with retention of single crystallinity.
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Affiliation(s)
- Nobuto Yoshinari
- Department of Chemistry , Graduate School of Science , Osaka University , Toyonaka , Osaka 560-0043 , Japan .
| | - Satoshi Yamashita
- Department of Chemistry , Graduate School of Science , Osaka University , Toyonaka , Osaka 560-0043 , Japan .
| | - Yosuke Fukuda
- Department of Chemistry , Graduate School of Science , Osaka University , Toyonaka , Osaka 560-0043 , Japan .
| | - Yasuhiro Nakazawa
- Department of Chemistry , Graduate School of Science , Osaka University , Toyonaka , Osaka 560-0043 , Japan .
| | - Takumi Konno
- Department of Chemistry , Graduate School of Science , Osaka University , Toyonaka , Osaka 560-0043 , Japan .
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Dunbar RC, Martens J, Berden G, Oomens J. Water Microsolvation Can Switch the Binding Mode of Ni(II) with Small Peptides. J Phys Chem Lett 2017; 8:2634-2638. [PMID: 28537749 DOI: 10.1021/acs.jpclett.7b00973] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Ni(II) ions can be caged by surrounding peptide ligands in two basic binding patterns: the "iminol" (IM) binding pattern, where chelation occurs by deprotonated amide nitrogens, or the charge-solvated (CS) binding pattern, where chelation occurs by amide carbonyl oxygens. Gas-phase observation may clarify the factors affecting this choice in solution and in peptide and protein matrices. Infrared spectroscopic determination of gas-phase structures shows here how microsolvation by just one water molecule switches the balance of this choice from IM to CS for the Ni2+Gly3 complex, in contrast with the always-CS structure of the Ni2+Gly4 complex. Quantum-chemical calculations indicate that CS complexation is even more favored in the aqueous limit. Considering gas-phase conditions as comparable to low-pH solutions can reconcile this prediction with the common observation of IM-type binding in solutions at higher pH. This is likely the first gas-phase observation of solvation-induced IM-to-CS transition in oligopeptide complexes with doubly charged transition-metal ions.
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Affiliation(s)
- Robert C Dunbar
- Chemistry Department, Case Western Reserve University , Cleveland, Ohio 44106, United States
| | - Jonathan Martens
- Radboud University , Institute for Molecules and Materials, FELIX Laboratory, Toernooiveld 7c, 6525ED Nijmegen, The Netherlands
| | - Giel Berden
- Radboud University , Institute for Molecules and Materials, FELIX Laboratory, Toernooiveld 7c, 6525ED Nijmegen, The Netherlands
| | - Jos Oomens
- Radboud University , Institute for Molecules and Materials, FELIX Laboratory, Toernooiveld 7c, 6525ED Nijmegen, The Netherlands
- University of Amsterdam , Science Park 904, 1098XH Amsterdam, The Netherlands
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Li X, Wu Z, Zhou X, Hu J. Colorimetric response of peptide modified gold nanoparticles: An original assay for ultrasensitive silver detection. Biosens Bioelectron 2017; 92:496-501. [DOI: 10.1016/j.bios.2016.10.075] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2016] [Revised: 10/22/2016] [Accepted: 10/25/2016] [Indexed: 11/30/2022]
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Darii E, Alves S, Gimbert Y, Perret A, Tabet JC. Meaning and consequence of the coexistence of competitive hydrogen bond/salt forms on the dissociation orientation of non-covalent complexes. J Chromatogr B Analyt Technol Biomed Life Sci 2017; 1047:45-58. [DOI: 10.1016/j.jchromb.2016.09.038] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2016] [Revised: 07/23/2016] [Accepted: 09/25/2016] [Indexed: 10/20/2022]
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12
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Wang J, Zuo Y, Hu C, Su Z. Theoretical and experimental studies on the structure–property relationship of chiral N,N′-dioxide–metal catalysts probed by the carbonyl–ene reaction of isatin. Catal Sci Technol 2017. [DOI: 10.1039/c7cy00322f] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Variation of the linkage or chiral backbone of an N,N′-dioxide ligand adjusts the blocking effect of ortho-iPr on the reaction site, affecting the enantiodifferentiation of two competing pathways.
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Affiliation(s)
- Junming Wang
- Key Laboratory of Green Chemistry and Technology
- Ministry of Education
- College of Chemistry Sichuan University
- Chengdu
- P.R. China
| | - Yini Zuo
- Key Laboratory of Green Chemistry and Technology
- Ministry of Education
- College of Chemistry Sichuan University
- Chengdu
- P.R. China
| | - Changwei Hu
- Key Laboratory of Green Chemistry and Technology
- Ministry of Education
- College of Chemistry Sichuan University
- Chengdu
- P.R. China
| | - Zhishan Su
- Key Laboratory of Green Chemistry and Technology
- Ministry of Education
- College of Chemistry Sichuan University
- Chengdu
- P.R. China
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Ash T, Debnath T, Banu T, Das AK. Exploration of Binding Interactions of Cu2+ with d-Penicillamine and its O- and Se- Analogues in Both Gas and Aqueous Phases: A Theoretical Approach. J Phys Chem B 2016; 120:3467-78. [DOI: 10.1021/acs.jpcb.5b11825] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Tamalika Ash
- Department of Spectroscopy, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India
| | - Tanay Debnath
- Department of Spectroscopy, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India
| | - Tahamida Banu
- Department of Spectroscopy, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India
| | - Abhijit K. Das
- Department of Spectroscopy, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India
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14
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Mandal S, Das G, Askari H. A combined experimental and quantum mechanical investigation on some selected metal complexes of l-serine with first row transition metal cations. J Mol Struct 2015. [DOI: 10.1016/j.molstruc.2014.10.048] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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15
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Tomé LIN, Sousa CSR, Gomes JRB, Ferreira O, Coutinho JAP, Pinho SP. Understanding the cation specific effects on the aqueous solubility of amino acids: from mono to polyvalent cations. RSC Adv 2015. [DOI: 10.1039/c5ra00501a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Based on solubility and molecular dynamics studies, a consistent and refined molecular description of the effect of the cation on the solubility of amino acids based on specific interactions of the cations with the negatively charged moieties of the biomolecules is proposed.
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Affiliation(s)
- L. I. N. Tomé
- CICECO
- Departamento de Química
- Universidade de Aveiro
- 3810-193 Aveiro
- Portugal
| | - C. S. R. Sousa
- LSRE-Laboratory of Separation and Reaction Engineering-Associate Laboratory LSRE/LCM
- Instituto Politécnico de Bragança
- Bragança
- Portugal
| | - J. R. B. Gomes
- CICECO
- Departamento de Química
- Universidade de Aveiro
- 3810-193 Aveiro
- Portugal
| | - O. Ferreira
- LSRE-Laboratory of Separation and Reaction Engineering-Associate Laboratory LSRE/LCM
- Instituto Politécnico de Bragança
- Bragança
- Portugal
| | - J. A. P. Coutinho
- CICECO
- Departamento de Química
- Universidade de Aveiro
- 3810-193 Aveiro
- Portugal
| | - S. P. Pinho
- LSRE-Laboratory of Separation and Reaction Engineering-Associate Laboratory LSRE/LCM
- Instituto Politécnico de Bragança
- Bragança
- Portugal
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16
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Meng L, Lin Z. Complexations of alkali/alkaline earth metal cations with gaseous glutamic acid. COMPUT THEOR CHEM 2014. [DOI: 10.1016/j.comptc.2014.04.016] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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17
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Mandal S, Das G, Askari H. Physicochemical investigations of the metal complexes ofl-valine with doubly charged ions of nickel, copper and zinc: a combined experimental and computational approach. RSC Adv 2014. [DOI: 10.1039/c4ra01288g] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Molecular electrostatic potentials inl-Val and its metal complexes.
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Affiliation(s)
- Shilpi Mandal
- Department of Chemistry
- North Eastern Hill University
- Shillong-793022, India
| | - Gunajyoti Das
- Department of Chemistry
- North Eastern Hill University
- Shillong-793022, India
| | - Hassan Askari
- Department of Chemistry
- North Eastern Hill University
- Shillong-793022, India
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18
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Theoretical study of hydrated Ca2+-amino acids (glycine, threonine and phenylalanine) clusters. COMPUT THEOR CHEM 2013. [DOI: 10.1016/j.comptc.2013.07.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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19
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Tomé LIN, Pinho SP, Jorge M, Gomes JRB, Coutinho JAP. Salting-in with a salting-out agent: explaining the cation specific effects on the aqueous solubility of amino acids. J Phys Chem B 2013; 117:6116-28. [PMID: 23638911 DOI: 10.1021/jp4021307] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Although the understanding of ion specific effects on the aqueous solubilities of biomolecules is crucial for the development of many areas of biochemistry and life sciences, a consensual and well-supported molecular picture of the phenomena has not yet been established. Mostly, the influence of cations and the nature of the molecular interactions responsible for the reversal of the Hofmeister trend in aqueous solutions of amino acids and proteins are still defectively understood. Aiming at contributing to the understanding of the molecular-level mechanisms governing the cation specific effects on the aqueous solubilities of biocompounds, experimental solubility measurements and classical molecular dynamics simulations were performed for aqueous solutions of three amino acids (alanine, valine, and isoleucine), in the presence of a series of inorganic salts. The evidence gathered suggests that the mechanism by which salting-in inducing cations operate in aqueous solutions of amino acids is different from that of anions, and allows for a novel and consistent molecular description of the effect of the cation on the solubility based on specific interactions of the cations with the negatively charged moieties of the biomolecules.
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Affiliation(s)
- Luciana I N Tomé
- CICECO, Departamento de Química, Universidade de Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
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Takayama A, Yoshikawa R, Iyoku S, Kasuga NC, Nomiya K. Synthesis, structure and antimicrobial activity of L-argininesilver(1+) nitrate. Polyhedron 2013. [DOI: 10.1016/j.poly.2012.07.031] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Yang G, Zhu R, Zhou L, Liu C. Interactions of Zn(II) with single and multiple amino acids. Insights from density functional and ab initio calculations. JOURNAL OF MASS SPECTROMETRY : JMS 2012; 47:1372-1383. [PMID: 23019170 DOI: 10.1002/jms.3075] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Calculations were performed to study the interactions of metal ions (M) with (multiple) amino acids (AA) and fill the gap between single AA and proteins. A complete conformational search results in nine and eleven ZnGly isomers at B3P86 and MP2 levels, respectively, and four populated conformers of glycine are responsible for production of these isomers. For all M, the isomers via the OO and NO binding modes are the main constituents, and the OO mode is favored by stronger electrostatic interactions. Binding with more glycines causes larger structural distortions, improves relative stabilities of monodentate binding isomers and generates new binding modes (e.g. ZnB(III) via only the hydroxyl group). The scaling factor of Zn(Gly)(n) structures, the ratio of its binding affinity versus the sum of comprising ZnGly isomers, is linear with glycine number (n), and the linear relationship may not be altered by mutations of glycines and M. It thus allows to estimate M(AA)(n) binding affinities (n ≥ 2) from the comprising MAA structures and analyze their structures with kinetic methods. The DFT and MP2 results become comparable by increasing metal coordination, e.g. the ZnB(III) versus ZnA(I) (zwitterionic) relative energy differs by 41.9 kcal mol(-1) at B3P86 and MP2 levels and is close by addition of three water molecules (4.1 kcal mol(-1)). The presence of water solvent improves the relative stabilities of monodentate binding isomers and results in a broader conformational distribution.
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Affiliation(s)
- Gang Yang
- Institute of Theoretical Chemistry, Shandong University, Jinan, P R China.
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22
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Meng L, Hu A, Pang R, Lin Z. Extensive computational study on coordination of transition metal cations and water molecules to glutamic acid. J Phys Chem A 2012; 116:7177-88. [PMID: 22671921 DOI: 10.1021/jp303289p] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
On the basis of the conformations of glutamic acid (Glu) and analysis of possible metal cation coordination and hydration modes, conformations of Glu metalated with transition metal cations (TMCs), Cu(+/2+), Zn(+/2+), and Fe(+/2+/3+) and hydrations of Glu-Cu(+/2+) and Glu-Zn(+/2+) complexes by up to three water molecules are determined by extensive computational searches. The BHandHLYP functional is chosen as the main computational method as its overall performance for treating the spin multiplicity of TMCs is similar to that of CCSD(T) and better than that of MP2 and B3LYP. All mono- and divalent TMCs prefer tridentate coordination to canonical Glu, while Fe(3+) favors a bidentate coordination to zwitterionic Glu. The ground state of Glu-Fe(+) is found to be a spin sextet. Metal ion affinities of Glu for the TMCs are determined, and an excellent agreement with the experiment for Cu(+) may be obtained if the entropic effect is properly accounted for. Effects of hydration on the stabilities of different Glu-Cu(+/2+)/Zn(+/2+) structures are discussed, and the hydration energies for up to three water molecules are obtained. For the global minimum to take the zwitterionic form, Glu-Zn(+) requires only monohydration, Glu-Zn(2+) needs to be trihydrated, while Glu-Cu(+/2) should be hydrated with four or more water molecules.
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Affiliation(s)
- Lingbiao Meng
- Hefei National Laboratory for Physical Sciences at Microscale and Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
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Wu R, Marta RA, Martens JK, Eldridge KR, McMahon TB. Experimental and theoretical investigation of the proton-bound dimer of lysine. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2011; 22:1651-9. [PMID: 21953268 DOI: 10.1007/s13361-011-0178-9] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2010] [Revised: 05/21/2011] [Accepted: 05/21/2011] [Indexed: 05/23/2023]
Abstract
The structure of the proton-bound lysine dimer has been investigated by infrared multiple photon dissociation (IRMPD) spectroscopy and electronic structure calculations. The structures of different possible isomers of the proton-bound lysine dimer have been optimized at the B3LYP/6-31 + G(d) level of theory and IR spectra calculated using the same computational method. Based on relative Gibbs free energies (298 K) calculated at the MP2/aug-cc-pVTZ//B3LYP/6-31 + G(d) level of theory, LL-CS01, and followed closely (1.1 kJ mol(-1)) by LL-CS02 are the most stable non-zwitterionic isomers. At the MP2/aug-cc-pVTZ//6-31 + G(d) and MP2/aug-cc-pVTZ//6-31 + (d,p) levels of theory, isomer LL-CS02 is favored by 3.0 and 2.3 kJ mol(-1), respectively. The relative Gibbs free energies calculated by the aforementioned levels of theory for LL-CS01 and LL-CS02 are very close and strongly suggest that diagnostic vibrational signatures found in the IRMPD spectrum of the proton-bound dimer of lysine can be attributed to the existence of both isomers. LL-ZW01 is the most stable zwitterionic isomer, in which the zwitterionic structure of the neutral lysine is well stabilized by the protonated lysine moiety via a very strong intermolecular hydrogen bond. At the MP2/aug-cc-pVTZ//B3LYP/6-31 + G(d), MP2/aug-cc-pVTZ//6-31 + G(d) and MP2/aug-cc-pVTZ//6-31 + G(d,p) levels of theory, the most stable zwitterionic isomer (LL-ZW01) is less favored than LL-CS01 by 7.3, 4.1 and 2.3 kJ mol(-1), respectively. The experimental IRMPD spectrum also confirms that the proton-bound dimer of lysine largely exists as charge-solvated isomers. Investigation of zwitterionic and charge-solvated species of amino acids in the gas phase will aid in a further understanding of structure, property, and function of biological molecules.
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Affiliation(s)
- Ronghu Wu
- Department of Chemistry, University of Waterloo, Waterloo, Ontario, Canada, N2L 3G1
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Mertens LA, Marzluff EM. Gas Phase Hydrogen/Deuterium Exchange of Arginine and Arginine Dipeptides Complexed with Alkali Metals. J Phys Chem A 2011; 115:9180-7. [DOI: 10.1021/jp204896z] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Laura A. Mertens
- Department of Chemistry, Grinnell College, Grinnell, Iowa, 50112 United States
| | - Elaine M. Marzluff
- Department of Chemistry, Grinnell College, Grinnell, Iowa, 50112 United States
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25
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Effect of regular hydration on gas phase structural stability of [zwitterionic alanine+M+] (M+=Li+, Na+, K+) complexes: A quantum chemical study. Chem Phys 2011. [DOI: 10.1016/j.chemphys.2010.11.013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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26
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Nicely AL, Lisy JM. Charge and Temperature Effects on Hydrated Tryptamine Cluster Ions. J Phys Chem A 2011; 115:2669-78. [DOI: 10.1021/jp1059648] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Amy L. Nicely
- Department of Chemistry, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
| | - James M. Lisy
- Department of Chemistry, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
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Wang D, Tejerina B, Lagzi I, Kowalczyk B, Grzybowski BA. Bridging interactions and selective nanoparticle aggregation mediated by monovalent cations. ACS NANO 2011; 5:530-6. [PMID: 21182267 DOI: 10.1021/nn1025252] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Selective aggregation and precipitation of like-charged nanoparticles (NPs) covered with carboxylate ligands can be induced by different monovalent cations. The ordering of critical concentrations required for NP precipitation is Cs(+) ≫ K(+) > Li(+) > Na(+) > Rb(+) and does not correlate with the size of hydrated cations M(+), nor can it be predicted by the Hofmeister series. On the other hand, different anions have no effect on the precipitation trends. These observations are rationalized by a theoretical model combining the elements of the DLVO theory with molecular-level calculations. The key component of the model is the cation-specific binding of various metal cations to the carboxylate ligands.
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Affiliation(s)
- Dawei Wang
- School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, P. R. China
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Effect of metal ions (Li+, Na+, K+, Mg2+, Ca2+, Ni2+, Cu2+ and Zn2+) and water coordination on the structure and properties of L-histidine and zwitterionic L-histidine. Amino Acids 2010; 39:1309-19. [PMID: 20364281 DOI: 10.1007/s00726-010-0573-8] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2009] [Accepted: 03/16/2010] [Indexed: 10/19/2022]
Abstract
Interactions between metal ions and amino acids are common both in solution and in the gas phase. The effect of metal ions and water on the structure of L-histidine is examined. The effect of metal ions (Li+, Na+, K+, Mg2+, Ca2+, Ni2+, Cu2+ and Zn2+) and water on structures of His·M(H2O)m, m=0.1 complexes have been determined theoretically employing density functional theories using extended basis sets. Of the five stable complexes investigated the relative stability of the gas-phase complexes computed with DFT methods (with one exception of K+ systems) suggest metallic complexes of the neutral L-histidine to be the most stable species. The calculations of monohydrated systems show that even one water molecule has a profound effect on the relative stability of individual complexes. Proton dissociation enthalpies and Gibbs energies of L-histidine in the presence of the metal cations Li+, Na+, K+, Mg2+, Ca2+, Ni2+, Cu2+ and Zn2+ were also computed. Its gas-phase acidity considerably increases upon chelation. Of the Lewis acids investigated, the strongest affinity to L-histidine is exhibited by the Cu2+ cation. The computed Gibbs energies ΔG are negative, span a rather broad energy interval (from -130 to -1,300 kJ/mol), and upon hydration are appreciably lowered.
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Drayβ MK, Blunk D, Oomens J, Gao B, Wyttenbach T, Bowers MT, Schäfer M. Systematic Study of the Structures of Potassiated Tertiary Amino Acids: Salt Bridge Structures Dominate. J Phys Chem A 2009; 113:9543-50. [DOI: 10.1021/jp903036t] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Miriam K. Drayβ
- Department of Chemistry, University of Cologne, Greinstraβe 4, 50939 Köln, Germany, FOM Institute for Plasmaphysics Rijnhuizen, Edisonbaan 14, NL-3439 MN Nieuwegein, The Netherlands,University of Amsterdam, Nieuwe Achtergracht 166, 1018WV Amsterdam, The Netherlands, and Department of Chemistry and Biochemistry, University of California, Santa Barbara, California
| | - Dirk Blunk
- Department of Chemistry, University of Cologne, Greinstraβe 4, 50939 Köln, Germany, FOM Institute for Plasmaphysics Rijnhuizen, Edisonbaan 14, NL-3439 MN Nieuwegein, The Netherlands,University of Amsterdam, Nieuwe Achtergracht 166, 1018WV Amsterdam, The Netherlands, and Department of Chemistry and Biochemistry, University of California, Santa Barbara, California
| | - Jos Oomens
- Department of Chemistry, University of Cologne, Greinstraβe 4, 50939 Köln, Germany, FOM Institute for Plasmaphysics Rijnhuizen, Edisonbaan 14, NL-3439 MN Nieuwegein, The Netherlands,University of Amsterdam, Nieuwe Achtergracht 166, 1018WV Amsterdam, The Netherlands, and Department of Chemistry and Biochemistry, University of California, Santa Barbara, California
| | - Bing Gao
- Department of Chemistry, University of Cologne, Greinstraβe 4, 50939 Köln, Germany, FOM Institute for Plasmaphysics Rijnhuizen, Edisonbaan 14, NL-3439 MN Nieuwegein, The Netherlands,University of Amsterdam, Nieuwe Achtergracht 166, 1018WV Amsterdam, The Netherlands, and Department of Chemistry and Biochemistry, University of California, Santa Barbara, California
| | - Thomas Wyttenbach
- Department of Chemistry, University of Cologne, Greinstraβe 4, 50939 Köln, Germany, FOM Institute for Plasmaphysics Rijnhuizen, Edisonbaan 14, NL-3439 MN Nieuwegein, The Netherlands,University of Amsterdam, Nieuwe Achtergracht 166, 1018WV Amsterdam, The Netherlands, and Department of Chemistry and Biochemistry, University of California, Santa Barbara, California
| | - Michael T. Bowers
- Department of Chemistry, University of Cologne, Greinstraβe 4, 50939 Köln, Germany, FOM Institute for Plasmaphysics Rijnhuizen, Edisonbaan 14, NL-3439 MN Nieuwegein, The Netherlands,University of Amsterdam, Nieuwe Achtergracht 166, 1018WV Amsterdam, The Netherlands, and Department of Chemistry and Biochemistry, University of California, Santa Barbara, California
| | - Mathias Schäfer
- Department of Chemistry, University of Cologne, Greinstraβe 4, 50939 Köln, Germany, FOM Institute for Plasmaphysics Rijnhuizen, Edisonbaan 14, NL-3439 MN Nieuwegein, The Netherlands,University of Amsterdam, Nieuwe Achtergracht 166, 1018WV Amsterdam, The Netherlands, and Department of Chemistry and Biochemistry, University of California, Santa Barbara, California
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Prell JS, O’Brien JT, Steill JD, Oomens J, Williams ER. Structures of Protonated Dipeptides: The Role of Arginine in Stabilizing Salt Bridges. J Am Chem Soc 2009; 131:11442-9. [DOI: 10.1021/ja901870d] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- James S. Prell
- Department of Chemistry, University of California, Berkeley, California 94720-1460, and FOM Institute for Plasma Physics “Rijnhuizen”, Edisonbaan 14, 3439 MN Nieuwegein, The Netherlands
| | - Jeremy T. O’Brien
- Department of Chemistry, University of California, Berkeley, California 94720-1460, and FOM Institute for Plasma Physics “Rijnhuizen”, Edisonbaan 14, 3439 MN Nieuwegein, The Netherlands
| | - Jeffrey D. Steill
- Department of Chemistry, University of California, Berkeley, California 94720-1460, and FOM Institute for Plasma Physics “Rijnhuizen”, Edisonbaan 14, 3439 MN Nieuwegein, The Netherlands
| | - Jos Oomens
- Department of Chemistry, University of California, Berkeley, California 94720-1460, and FOM Institute for Plasma Physics “Rijnhuizen”, Edisonbaan 14, 3439 MN Nieuwegein, The Netherlands
| | - Evan R. Williams
- Department of Chemistry, University of California, Berkeley, California 94720-1460, and FOM Institute for Plasma Physics “Rijnhuizen”, Edisonbaan 14, 3439 MN Nieuwegein, The Netherlands
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Lee GY. Interaction of Proline with Cu+and Cu2+Ions in the Gas PhaseGab Yong Lee*Department of Life Chemistry, Catholic University of Daegu, Gyeongsan 712‐702, Korea(Received March 3, 2009)INTRODUCTIONCopper ions are the most important transitionmetals involved in several biological processes ofliving systems, including oxidation, dioxygentransport, and charge transfer.1 The study of interactionsbetween the metal ion and amino acids hasattracted considerable attention from experimental2-6and theoretical6-11 viewpoints. Thermochemicalinformation on interactions between the metal ion and biological. JOURNAL OF THE KOREAN CHEMICAL SOCIETY-DAEHAN HWAHAK HOE JEE 2009. [DOI: 10.5012/jkcs.2009.53.3.257] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Prell JS, Demireva M, Oomens J, Williams ER. Role of Sequence in Salt-Bridge Formation for Alkali Metal Cationized GlyArg and ArgGly Investigated with IRMPD Spectroscopy and Theory. J Am Chem Soc 2008; 131:1232-42. [DOI: 10.1021/ja808177z] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- James S. Prell
- Department of Chemistry, University of California, Berkeley, California 94720-1460, and FOM Institute for Plasma Physics “Rijnhuizen,” Edisonbaan 14, 3439 MN Nieuwegein, The Netherlands
| | - Maria Demireva
- Department of Chemistry, University of California, Berkeley, California 94720-1460, and FOM Institute for Plasma Physics “Rijnhuizen,” Edisonbaan 14, 3439 MN Nieuwegein, The Netherlands
| | - Jos Oomens
- Department of Chemistry, University of California, Berkeley, California 94720-1460, and FOM Institute for Plasma Physics “Rijnhuizen,” Edisonbaan 14, 3439 MN Nieuwegein, The Netherlands
| | - Evan R. Williams
- Department of Chemistry, University of California, Berkeley, California 94720-1460, and FOM Institute for Plasma Physics “Rijnhuizen,” Edisonbaan 14, 3439 MN Nieuwegein, The Netherlands
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