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Pani BSUL, Chandrasekaran N. Adsorption of clarithromycin on polystyrene nanoplastics surface and its combined adverse effect on serum albumin. Colloids Surf B Biointerfaces 2024; 234:113673. [PMID: 38086277 DOI: 10.1016/j.colsurfb.2023.113673] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2023] [Revised: 11/20/2023] [Accepted: 11/24/2023] [Indexed: 02/09/2024]
Abstract
Emerging contaminants, such as antibiotics and nanoplastics, have garnered significant attention due to their potential adverse effects on diverse ecosystems. Antibiotic adsorption on the surface of nanoplastics potentially facilitates their long-range transport, leading to the synergistic effects of the complex. This research aims to examine the adsorption behavior of clarithromycin binding with polystyrene nanoplastics surface as well as their interaction between drug adsorbed polystyrene nanoplastics with serum albumin. Different spectroscopic methods were used to find out the interaction between clarithromycin and nanoplastics, under stimulated physiological conditions UV-vis spectroscopy showed a maximum of 22.8% percentage of the drug adsorbed with the polystyrene nanoplastics surface after 6 h of incubation. The fluorescence spectroscopic results demonstrated that the fluorescence intensity of serum albumin was quenched by the clarithromycin-polystyrene nanoplastics (CLA-PSNP) complex through static quenching. We calculated the number of binding stoichiometry, binding constants, and thermodynamic parameters. This study revealed that the CLA-PSNP binds to serum albumin spontaneously and its hydrophobic interactions played a significant role. The conformational changes in the structure of serum albumin were revealed from the findings of synchronous fluorescence spectra, CD spectra, and 3D fluorescence spectra, leading to the disturbance in functional activity. This study focuses valuable insights into the intermolecular interactions between clarithromycin-adsorbed polystyrene nanoplastics and serum albumin and its potential molecular-level biological toxicity.
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2
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Meng X, Nan G, Du Y, Zhao H, Zheng H, Lin R, Yang G. Comparing the interactions of nitrendipine with lysozyme or human serum albumin and the effects of vitamin C and naringin on these interactions by spectroscopy and molecular docking methods. LUMINESCENCE 2024; 39:e4618. [PMID: 37937696 DOI: 10.1002/bio.4618] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2023] [Revised: 09/30/2023] [Accepted: 10/16/2023] [Indexed: 11/09/2023]
Abstract
The interactions between drugs and proteins play a pivotal role in determining the pharmacological effects and disposition of drugs within the human body. This study focuses on exploring the interaction between nitrendipine and lysozyme/human serum albumin. Spectroscopic analysis indicated a compound static quenching, indicative of the formation of stable complexes between the drug and proteins. The addition of vitamin C or naringin resulted in a decrease of the binding constant between nitrendipine and lysozyme/human serum albumin. The presence of these compounds may disrupt the interactions between the drug and proteins, potentially leading to an increased concentration of free nitrendipine in the bloodstream. Nitrendipine binds more easily to human serum albumin at 310 K, and human serum albumin has an average binding site ratio with nitrendipine approximately 0.1 higher than that with lysozyme. Vitamin C has a greater impact on the binding constant of nitrendipine to human serum albumin and lysozyme. Compared to the binary system of proteins with the drug, the ternary system with the addition of vitamin C at 310 K reduces the binding constants of lysozyme and human serum albumin by 85%. In conclusion, this study explores the significance of considering drug-protein interactions in understanding drug behavior and potential drug-food interactions.
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Affiliation(s)
- Xianxin Meng
- School of Pharmacy, Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - Guanjun Nan
- School of Pharmacy, Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - Yan Du
- School of Pharmacy, Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - Hongwen Zhao
- School of Pharmacy, Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - Hongxia Zheng
- School of Pharmacy, Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - Rong Lin
- School of Basic Medical Sciences, Xian Jiaotong University, Xi'an, Shaanxi, China
| | - Guangde Yang
- School of Pharmacy, Xi'an Jiaotong University, Xi'an, Shaanxi, China
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3
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Rajendran D, Chandrasekaran N. Unveiling the Modification of Esterase-like Activity of Serum Albumin by Nanoplastics and Their Cocontaminants. ACS OMEGA 2023; 8:43719-43731. [PMID: 38027364 PMCID: PMC10666218 DOI: 10.1021/acsomega.3c05447] [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: 07/26/2023] [Accepted: 09/29/2023] [Indexed: 12/01/2023]
Abstract
Nanoplastics and other cocontaminants have raised concerns due to their widespread presence in the environment and their potential to enter the food chain. The harmful effects of these particles depend on various factors, such as nanoparticle size, shape, surface charge, and the nature of the cocontaminants involved. On entering the human body, human serum albumin (HSA) molecules bind and transport these particles in the blood system. The esterase-like activity of HSA, which plays a role in metabolizing drug/toxic compounds, was taken as a representative to portray the effects of these particles on HSA. Polystyrene nanoplastics (PSNPs) with different surface functionalization (plain (PS), amine (PS-NH2), and carboxy (PS-COOH)), different sizes (100 and 500 nm), and PS with cocontaminant metformin hydrochloride (Met-HCl), a widely used antidiabetic drug, were investigated in this study. Fluorescence emission spectra of HSA revealed that PS-NH2 exhibits a greater effect on protein conformation, smaller NPs have a greater influence on protein structure than larger NPs, and Met-HCl lowers PSNPs' affinity for HSA by coating the surface of the NPs, which may result in direct NP distribution to the drug's target organs and toxicity. Circular dichroism spectra also supported these results in terms of secondary structural changes. Esterase activity of HSA was inhibited by all the particles (except Met-HCl) by competitive inhibition as concluded from constant Vmax and increasing Km. Greater reduction in enzyme activity was observed for PS-NH2 among functionalizations and for 100 nm PS among sizes. Furthermore, Met-HCl lowers the inhibitory impact of PSNPs on HSA since the drug binds weakly to HSA, and so they can serve as a vector delivering PSNPs to their target organs, resulting in serious implications.
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Affiliation(s)
- Durgalakshmi Rajendran
- Centre for Nanobiotechnology, Vellore Institute of Technology (VIT University), Vellore 632014, Tamil Nadu, India
| | - Natarajan Chandrasekaran
- Centre for Nanobiotechnology, Vellore Institute of Technology (VIT University), Vellore 632014, Tamil Nadu, India
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4
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Hadidi S. A binuclear Cu(I)-phosphine complex as a specific HSA site I binder: synthesis, X-ray structure determination, and a comprehensive HSA interaction analysis. J Biomol Struct Dyn 2023; 41:7616-7626. [PMID: 36120938 DOI: 10.1080/07391102.2022.2123401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2022] [Accepted: 09/04/2022] [Indexed: 10/14/2022]
Abstract
In this research, we present a method for synthesis and a detailed description of geometry characterization of a novel binuclear Cu(I) phosphine complex, along with analysis of its interaction with HSA using spectroscopic and simulation methods. The Cu atoms are coordinated in a tetrahedral geometry, which results in coordination by two nitrogen atoms from the N,N'-(ethane-1,2-diyl)bis(1-(pyridin-2-yl)methanimine ligand (L), a chloride, and a PPh3. The complex binding constant to HSA in a biochemical environment was determined to be ∼106, which is indicative of a strong interaction. The fluorescence of HSA is significantly quenched by binding to the complex via a static mechanism, whereas the microenvironment of the tryptophan residue remains unchanged. A spontaneous binding process was indicated by a negative value for ΔG. Thermodynamic signatures reflect the dominance of hydrophobic forces during the interaction. The site marker competitive experiment combined with docking simulation analysis revealed the closeness position of the complex binding site to warfarin location in specific ligand site I of HSA. The information generated in the present study would be valuable to understand the interaction mechanistic and pharmacological behavior of Cu(I) complexes.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Saba Hadidi
- Department of Inorganic Chemistry, Faculty of Chemistry, Razi University, Kermanshah, Iran
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Mishra V, Pathak AK, Bandyopadhyay T. Binding of human serum albumin with uranyl ion at various pH: an all atom molecular dynamics study. J Biomol Struct Dyn 2023; 41:7318-7328. [PMID: 36099177 DOI: 10.1080/07391102.2022.2120080] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Accepted: 08/26/2022] [Indexed: 10/14/2022]
Abstract
Uranium is routinely handled in various stages of nuclear fuel cycle and its association with human serum albumin (HSA) has been reported in literature, however, their binding characteristics still remains obscure. The present study aims to understand interaction of uranium with HSA by employing all atom molecular dynamics simulation of the HSA-metal ion complex. His67, His247 and Asp249 residues constitute the major binding site of HSA, which capture the uranyl ion (UO22+). A total of six sets of initial coordinates are used for Zn2+-HSA and UO22+-HSA system at pH = 4, 7.4 and 9, respectively. Enhance sampling method, namely, well-tempered meta-dynamics (WT-MtD) is employed to study the binding and un-binding processes of UO22+ and Zn2+ ions. Potential of mean force (PMF) profiles are generated for all the six sets of complexes from the converged WT-MtD run. Various basins and barriers are observed along the (un)binding pathways. Hydrogen bond dynamics and short-range Coulomb interactions are evaluated from the equilibrium run at each basins and barriers for both the ions at all pH values. The binding of UO22+ ion with HSA is the result of the dynamical balance between UO22+-HSA and UO22+-water short range Coulomb interactions. Zn2+ ion interact more strongly than UO22+ at all pH through short range Coulomb interactions. PMF values further concludes that UO22+ cannot associate to the Zn2+ bound HSA protein but can be captured by free HSA at all pH values i.e. endosomal, alkaline and physiological pH.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Vijayakriti Mishra
- Radiation Safety Systems Division, Bhabha Atomic Research Centre, Mumbai, India
- Homi Bhabha National Institute, Mumbai, India
| | - Arup Kumar Pathak
- Homi Bhabha National Institute, Mumbai, India
- Chemistry Division, Bhabha Atomic Research Centre, Mumbai, India
| | - Tusar Bandyopadhyay
- Homi Bhabha National Institute, Mumbai, India
- Chemistry Division, Bhabha Atomic Research Centre, Mumbai, India
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Zoanni B, Brioschi M, Mallia A, Gianazza E, Eligini S, Carini M, Aldini G, Banfi C. Novel insights about albumin in cardiovascular diseases: Focus on heart failure. MASS SPECTROMETRY REVIEWS 2023; 42:1113-1128. [PMID: 34747521 DOI: 10.1002/mas.21743] [Citation(s) in RCA: 13] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2021] [Revised: 08/27/2021] [Accepted: 09/02/2021] [Indexed: 06/07/2023]
Abstract
The Human Plasma Proteome has always been the most investigated compartment in proteomics-based biomarker discovery, and is considered the largest and deepest version of the human proteome, reflecting the state of the body in health and disease. Even if efforts have been always dedicated to the refinement of proteomic approaches to investigate more deeply the plasma proteome, it should not be forgotten that also highly abundant plasma proteins, like human serum albumin (HSA), often neglected in these studies, might provide fundamental physiological functions in plasma, and should be better considered. This review summarizes the important roles of HSA in the context of cardiovascular diseases (CVD), and in particular in heart failure. Notwithstanding much attention has been historically directed toward the association of HSA levels and CVD risk, the advances in the field of mass spectrometry research allow also a better characterization of the effects of oxidative modifications that could alter not only the structure but also the function of HSA.
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Affiliation(s)
| | | | - Alice Mallia
- Centro Cardiologico Monzino, IRCCS, Milano, Italy
| | | | | | - Marina Carini
- Dipartimento di Scienze Farmaceutiche, Università di Milano, Milan, Italy
| | - Giancarlo Aldini
- Dipartimento di Scienze Farmaceutiche, Università di Milano, Milan, Italy
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Nemergut M, Sedláková D, Fabriciová G, Belej D, Jancura D, Sedlák E. Explanation of inconsistencies in the determination of human serum albumin thermal stability. Int J Biol Macromol 2023; 232:123379. [PMID: 36702231 DOI: 10.1016/j.ijbiomac.2023.123379] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2022] [Revised: 01/15/2023] [Accepted: 01/18/2023] [Indexed: 01/24/2023]
Abstract
Thermal denaturation of human serum albumin has been the subject of many studies in recent decades, but the results of these studies are often conflicting and inconclusive. To clarify this, we combined different spectroscopic and calorimetric techniques and performed an in-depth analysis of the structural changes that occur during the thermal unfolding of different conformational forms of human serum albumin. Our results showed that the inconsistency of the results in the literature is related to the different quality of samples in different batches, methodological approaches and experimental conditions used in the studies. We confirmed that the presence of fatty acids (FAs) causes a more complex process of the thermal denaturation of human serum albumin. While the unfolding pathway of human serum albumin without FAs can be described by a two-step model, consisting of subsequent reversible and irreversible transitions, the thermal denaturation of human serum albumin with FAs appears to be a three-step process, consisting of a reversible step followed by two consecutive irreversible transitions.
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Affiliation(s)
- Michal Nemergut
- Center for Interdisciplinary Biosciences, P. J. Šafárik University in Košice, Jesenná 5, 04154 Košice, Slovakia
| | - Dagmar Sedláková
- Department of Biophysics, Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 04001 Košice, Slovakia
| | - Gabriela Fabriciová
- Department of Biophysics, Faculty of Science, P. J. Šafárik University in Košice, Jesenná 5, 04154 Košice, Slovakia
| | - Dominik Belej
- Department of Biophysics, Faculty of Science, P. J. Šafárik University in Košice, Jesenná 5, 04154 Košice, Slovakia
| | - Daniel Jancura
- Department of Biophysics, Faculty of Science, P. J. Šafárik University in Košice, Jesenná 5, 04154 Košice, Slovakia
| | - Erik Sedlák
- Center for Interdisciplinary Biosciences, P. J. Šafárik University in Košice, Jesenná 5, 04154 Košice, Slovakia; Department of Biochemistry, Faculty of Science, P. J. Šafárik University in Košice, Moyzesova 11, 04154 Košice, Slovakia.
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8
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Chen J, Bian X, Zhang S, Yang G. Study on the interaction of two quinazoline derivatives as novel PI3K/mTOR dual inhibitors and anticancer agents to human serum albumin utilizing spectroscopy and docking. LUMINESCENCE 2023; 38:260-268. [PMID: 36648974 DOI: 10.1002/bio.4444] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2022] [Revised: 11/25/2022] [Accepted: 01/15/2023] [Indexed: 01/18/2023]
Abstract
Interactions of human serum albumin (HSA) with two structurally similar quinazoline derivatives, S1 and S2 , which are potential anticancer drugs acting on PI3K/mTOR targets, were investigated in vitro utilizing multiple spectroscopy as well as molecular docking. The fluorescence quenching study demonstrated that HSA fluorescence could be statically quenched by S1 and S2 through the formation of an HSA-drug complex. Furthermore, the details of the binding site number, binding constant, as well as the thermodynamic parameters, were estimated at 298, 303, and 310 K. The results revealed that hydrogen bond interactions, as well as van der Waals forces, were the predominant factors responsible for binding HSA to S1 or S2 . Synchronous fluorescence and ultraviolet (UV) absorption spectra suggested that S1 and S2 had little effect on the polarity of the microenvironment and conformation of HSA. Energy transfer from HSA to S1 or S2 most probably occurred. The docking study revealed that S1 and S2 were able to bind to the hydrophobic cavity that was located in the HSA subdomain IIA and formed varying numbers of hydrogen bonds with amino acid residues nearby. Due to the subtle difference in the chemical structure, the binding of S1 and S2 to HSA was slightly different.
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Affiliation(s)
- Jiangang Chen
- School of Pharmacy, Xi'an Jiaotong University, Xi'an, Shaanxi Province, China
| | - Xiaoli Bian
- School of Pharmacy, Xi'an Jiaotong University, Xi'an, Shaanxi Province, China
| | - Sanqi Zhang
- School of Pharmacy, Xi'an Jiaotong University, Xi'an, Shaanxi Province, China
| | - Guangde Yang
- School of Pharmacy, Xi'an Jiaotong University, Xi'an, Shaanxi Province, China
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9
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Jose A, Porel M. Probing the interactions of dansyl appended sequence-defined oligomers with serum albumins: Effect of functionality, hydrophobicity, and architecture. J Photochem Photobiol A Chem 2023. [DOI: 10.1016/j.jphotochem.2023.114640] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
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10
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Jithinraj TK, Saheer VC, Chakkumkumarath L. Chiral 8-aminoBODIPY-based fluorescent probes with site selectivity for the quantitative detection of HSA in biological samples. Analyst 2023; 148:286-296. [PMID: 36533779 DOI: 10.1039/d2an01525k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022]
Abstract
Human serum albumin (HSA) is one of the vital proteins in blood serum, and its optimum level is a reflection of the physiological well-being of an individual. Any abnormalities in serum HSA levels could often be a sign of disguised physiological disorders. The importance of fast and accurate determination of serum HSA levels has led to the development of various quantification methods. Among these, fluorescence-based methods employ molecular probes capable of producing selective responses on interaction with HSA. Herein, we report chiral 8-aminoBODIPY-based probes having blue emission for the quantitative detection of HSA in buffer and human blood serum. A pair of 8-aminoBODIPY enantiomers, namely R-PEB and S-PEB, were synthesized. They exhibited a fast 'turn-on' fluorescence response towards HSA, allowing its detection and quantification. In PBS buffer, R-PEB and S-PEB showed very good sensitivity with a limit of detection (LoD) of 25 nM (KD = 9.84 ± 0.14 μM) and 39 nM (KD = 18.67 ± 0.21 μM), respectively. The linear relationship observed between the fluorescence intensity of R-PEB/S-PEB and the HSA concentration in serum samples allowed us to generate a reference curve for HSA estimation for practical applications. Examination of unknown serum samples showed a good correlation with the results obtained by the benchmark BCG method. Interestingly, the difference in these probes' dissociation constants and LoD indicated their differential binding to HSA. Considering the availability of multiple ligand binding sites in HSA, their binding preferences were investigated in detail by displacement assays using site-specific drugs. These studies showed the preferential affinity of R-PEB towards site II, which was further substantiated using molecular docking studies. However, these displacement assays could not identify the preferred binding site of S-PEB. Blind docking studies indicated that S-PEB occupied a site closer to FA5. Selective binding of R-PEB to site II and its characteristic photophysical response can be utilized to quickly screen potential site II binding drugs.
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Affiliation(s)
| | | | - Lakshmi Chakkumkumarath
- Department of Chemistry, National Institute of Technology Calicut, Calicut-673601, Kerala, India.
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11
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Triptolide and methotrexate binding competitively to bovine serum albumin: A study of spectroscopic experiments, molecular docking, and molecular dynamic simulation. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120300] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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12
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Fatma I, Sharma V, Ahmad Malik N, Assad H, Cantero-López P, Sánchez J, López-Rendón R, Yañez O, Chand Thakur R, Kumar A. Influence of HSA on micellization of NLSS and BC: An experimental-theoretical approach of its binding characteristics. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120532] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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13
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Real-time monitoring of polymyxin B-sodium deoxycholate sulfate binding with immobilized human serum albumin by surface plasmon resonance. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.130816] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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14
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Qin C, Lu YX, Borch T, Yang LL, Li YW, Zhao HM, Hu X, Gao Y, Xiang L, Mo CH, Li QX. Interactions between Extracellular DNA and Perfluoroalkyl Acids (PFAAs) Decrease the Bioavailability of PFAAs in Pakchoi ( Brassica chinensis L.). JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2022; 70:14622-14632. [PMID: 36375011 DOI: 10.1021/acs.jafc.2c04597] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Perfluoroalkyl acids (PFAAs) are emerging ionic organic pollutants worldwide. Great amounts of extracellular DNA (∼mg/kg) coexist with PFAAs in the environment. However, PFAA-DNA interactions and effects of such interactions have not been well studied. Herein, we used isothermal titration calorimetry (ITC), spectroscopy, and computational simulations to investigate the PFAA-DNA interactions. ITC assays showed that specific binding affinities of PFHxA-DNA, PFOA-DNA, PFNA-DNA, and PFOS-DNA were 5.14 × 105, 3.29 × 105, 1.99 × 105, and 2.18 × 104 L/mol, respectively, which were about 1-2 orders of magnitude stronger than those of PFAAs with human serum albumin. Spectral analysis suggested interactions of PFAAs with adenine (A), cytosine (C), guanine (G), and thymine (T), among which grooves associated with thymine were the major binding sites. Molecular dynamics simulations and quantum chemical calculations suggested that hydrogen bonds and van der Waals forces were the main interaction forces. Such a PFAA-DNA binding decreased the bioavailability of PFAAs in plant seedlings. The findings will help to improve the current understanding of the interaction between PFAAs and biomacromolecules, as well as how such interactions affect the bioavailability of PFAAs.
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Affiliation(s)
- Chao Qin
- Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials, College of Life Science and Technology, Jinan University, Guangzhou510632, China
- Institute of Organic Contaminant Control and Soil Remediation, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing210095, China
| | - Ying-Xin Lu
- Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials, College of Life Science and Technology, Jinan University, Guangzhou510632, China
| | - Thomas Borch
- Department of Chemistry, Colorado State University, 1872 Campus Delivery, Fort Collins, Colorado80523, United States
- Department of Soil and Crop Sciences, Colorado State University, 1170 Campus Delivery, Fort Collins, Colorado80523, United States
| | - Ling-Ling Yang
- Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials, College of Life Science and Technology, Jinan University, Guangzhou510632, China
| | - Yan-Wen Li
- Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials, College of Life Science and Technology, Jinan University, Guangzhou510632, China
| | - Hai-Ming Zhao
- Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials, College of Life Science and Technology, Jinan University, Guangzhou510632, China
| | - Xiaojie Hu
- Institute of Organic Contaminant Control and Soil Remediation, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing210095, China
| | - Yanzheng Gao
- Institute of Organic Contaminant Control and Soil Remediation, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing210095, China
| | - Lei Xiang
- Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials, College of Life Science and Technology, Jinan University, Guangzhou510632, China
| | - Ce-Hui Mo
- Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials, College of Life Science and Technology, Jinan University, Guangzhou510632, China
| | - Qing X Li
- Department of Molecular Biosciences and Bioengineering, University of Hawaii at Manoa, Honolulu, Hawaii96822, United States
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15
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Li W, Zhang X, Tan S, Li X, Gu M, Tang M, Zhao X, Wu Y. Zein enhanced the digestive stability of five citrus flavonoids via different binding interaction. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2022; 102:4780-4790. [PMID: 35218206 DOI: 10.1002/jsfa.11838] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2021] [Revised: 01/03/2022] [Accepted: 02/26/2022] [Indexed: 06/14/2023]
Abstract
BACKGROUND Zein is commonly used to construct food flavonoid delivery systems. This study investigated the effect and mechanism of zein on the digestive stability of five citrus flavonoids, namely hesperetin (HET), hesperidin (HED), neohesperidin (NHD), naringenin (NEN), and naringin (NIN). RESULTS Zein enhanced the digestive stability of the five citrus flavonoids, especially that of HET and NEN, during digestion in the stomach and small intestine. Fluorescence spectroscopy results suggested that citrus flavonoids spontaneously quenched the endogenous fluorescence of zein in static quenching mode. The binding of HET, HED and NHD to zein was driven respectively by electrostatic, hydrophobic and electrostatic interaction. However, Van der Waals' force and hydrogen (H)-bond interaction represented the primary driving force for binding NEN, and NIN to zein to form complexes. The binding of the five citrus flavonoids to zein also caused a diverse bathochromic shift in ultraviolet absorbance. Analysis using Fourier-transform infrared and Raman spectroscopy revealed that the binding behavior of the five citrus flavonoids had different effects on changes in the secondary structures, disulfide bonds, and tyrosine exposure of zein. The results were also partially verified by molecular dynamic simulation. CONCLUSIONS Zein enhanced the digestive stability of the five citrus flavonoids via different binding interactions that was due to the difference in molecular structure of citrus flavonoids. © 2022 Society of Chemical Industry.
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Affiliation(s)
- Wenfeng Li
- School of Life Science and Biotechnology, Yangtze Normal University, Chongqing, China
| | - Xiaohua Zhang
- School of Life Science and Biotechnology, Yangtze Normal University, Chongqing, China
| | - Si Tan
- School of Life Science and Biotechnology, Yangtze Normal University, Chongqing, China
| | - Xueping Li
- School of Life Science and Biotechnology, Yangtze Normal University, Chongqing, China
| | - Mengyuan Gu
- School of Life Science and Biotechnology, Yangtze Normal University, Chongqing, China
| | - Mengqi Tang
- School of Life Science and Biotechnology, Yangtze Normal University, Chongqing, China
| | - Xin Zhao
- Chongqing Collaborative Innovation Center for Functional Food, Chongqing University of Education, Chongqing, China
| | - Yingmei Wu
- The Chongqing Engineering Laboratory for Green Cultivation and Deep Processing of the Three Gorges Reservoir Area's Medicinal Herbs, College of Biology and Food Engineering, Chongqing Three Gorges University, Chongqing, China
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16
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Interactions between stipuol enantiomers and human serum albumin. Food Chem 2022; 385:132686. [PMID: 35299022 DOI: 10.1016/j.foodchem.2022.132686] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Revised: 03/09/2022] [Accepted: 03/10/2022] [Indexed: 11/20/2022]
Abstract
Natural polyacetylenes occur in food and herbal plants, have a wide range of bioactivities, and are recognized as important nutraceuticals. Stipuol is a natural polyacetylene present in the edible plant Panax notoginseng. The present study was aimed to study interactions of rac-stipuol and its enantiomers with human serum albumin (HSA) using multi-spectroscopic, molecular modeling and microscale thermophoresis. Steady-state and time-resolved fluorescence spectra manifest that the fluorescence quenching mechanism is mainly static in type. The bindings of (S)-stipuol, (R)-stipuol, rac-stipuol lead to some microenvironmental and slight conformational changes of HSA. Competitive ligand displacement experiments and molecular modeling studies revealed that stipuol enantiomers bind to HSA at subdomain III (site IIA). The calculated values of Ka and Kd showed that (R)-stipuol had a stronger binding affinity than (S)-stipuol. The results are informative for use of stipuol as a nutraceutical to improve human health.
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Malik S, Zaidi N, Siddiqi MK, Majid N, Masroor A, Salam S, Khan RH. Mechanistic insight into inhibition of amyloid fibrillation of human serum albumin by Vildagliptin. Colloids Surf B Biointerfaces 2022; 216:112563. [PMID: 35588684 DOI: 10.1016/j.colsurfb.2022.112563] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2022] [Revised: 05/05/2022] [Accepted: 05/10/2022] [Indexed: 11/25/2022]
Abstract
Protein aggregation leads to several human pathologies such as Alzheimer's disease (AD), type 2 diabetes (T2D), Parkinson's disease (PD), etc. Due to the overlap in the mechanisms of type 2 diabetes and brain disorders, common effective pharmacological interventions to treat both T2D and AD is under extensive research. Therefore, major aim of research is to repurpose already established treatment of diabetes to cure AD as well. This study evaluates mechanistic insight into anti-amyloidogenic potential of anti-diabetic drug Vildagliptin (VLD) on human serum albumin fibrillation (HSA) by using biophysical, calorimetric, imaging techniques along with hemolytic assay. Dynamic light scattering (DLS) and Rayleigh light scattering (RLS) results showed presence of few small-sized aggregates in the presence of VLD which are formed by deaccelerating the amyloidogenesis as shown by thioflavin T (ThT) fluorescence and Congo red (CR) binding assay. Further, Isothermal titration calorimetry (ITC), steady state fluorescence quenching, molecular docking results revealed that VLD form complex with amyloid facilitating state of HSA and consequently mask the hydrophobic residues involved in amyloidogenesis as evident from decrease in ANS fluorescence. Differential scanning calorimetry (DSC) results confirm that VLD stabilizes the amyloid facilitating state of HSA. In addition, SEM images demonstrated that VLD alleviates the hemolytic effect induced by fibrils of HSA. This study reports VLD as a potential inhibitor of amyloid fibrillation and provides promising results to repurpose VLD as a drug candidate for the cure of Alzheimer's diseases along with diabetes.
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Affiliation(s)
- Sadia Malik
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh 202002, India
| | - Nida Zaidi
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh 202002, India
| | | | - Nabeela Majid
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh 202002, India
| | - Aiman Masroor
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh 202002, India
| | - Samreen Salam
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh 202002, India
| | - Rizwan H Khan
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh 202002, India.
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Lyndem S, Gazi R, Belwal VK, Bhatta A, Jana M, Roy AS. Binding of bioactive esculin and esculetin with hen egg white lysozyme: Spectroscopic and computational methods to comprehensively elucidate the binding affinities, interacting forces, and conformational alterations at molecular level. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.119423] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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19
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An insight into the interaction between Indisulam and human serum albumin: Spectroscopic method, computer simulation and in vitro cytotoxicity assay. Bioorg Chem 2022; 127:106017. [PMID: 35841666 DOI: 10.1016/j.bioorg.2022.106017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Revised: 06/24/2022] [Accepted: 07/07/2022] [Indexed: 11/24/2022]
Abstract
Indisulam (IDM) is a sulfanilamide anticancer agent and has been identified as a molecular glue recently. It shows potential for novel therapies development and brings more hope for curing human diseases. The affinity between molecular glues and plasma protein makes it significant to understand the characteristics of such substances. Therefore, the interaction between IDM and human serum albumin (HSA) was explored through solvent experiments, computer simulation experiments, enzyme kinetics experiments, and cell viability assay. The results revealed that IDM and HSA spontaneously formed stable binary complex with the binding constant of the order 105 M-1. IDM inserted in the site I of HSA, resulting the change in HSA secondary structure. And π electrons in IDM's benzene rings, as well as van der Waals forces and the H-bond, all helped to stabilize the HSA-IDM complex. The results of molecular dynamic simulation (MD) corresponded with the results from solvent experiment well. For instance, there were approximately 1-5 H-bonds between IDM and HSA. Lys199 and Arg218 were crucial energy contributors in the binding process. The esterase-like activity experiment confirmed that IDM inhibited the catalytic activity of HSA. In addition, cell experiment revealed that serum albumin can significantly reduce the cytotoxicity of IDM towards human embryonic kidney 293T (HEK293T) cells.
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Xu M, Cui Z, Xiao Y, Liu C, Liu R, Zong W. Probing the potential toxicity by characterizing the binding mechanism of sodium dehydroacetate to human serum albumin. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2022; 102:3655-3664. [PMID: 34882798 DOI: 10.1002/jsfa.11712] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2021] [Revised: 11/03/2021] [Accepted: 12/09/2021] [Indexed: 06/13/2023]
Abstract
BACKGROUND Sodium dehydroacetate (DHA-S) is a common food additive, which can combine with serum proteins in the plasma, but the interaction mechanism between DHA-S and human serum albumin (HSA) is unclear. In this study, multiple spectroscopy techniques, isothermal titration calorimetry (ITC), molecular docking and esterase activity test were employed to investigate the interaction mechanism of DHA-S and HSA. RESULTS A DHA-S-HSA complex was formed and the structure of HSA were altered by DHA-S. Since DHA-S changed the tight structure of the hydrophobic subdomain IIA where tryptophan (Trp) was placed, the hydrophobicity of the microenvironment of HSA was enhanced. With the addition of DHA-S, the skeleton structure of HSA became loose and the solvent shell on the HSA surface was destroyed. DHA-S altered the secondary structure of HSA, resulting in the decreased α-helix and increased β-sheet contents. The interaction was exothermic and spontaneous driven by van der Waals and hydrogen bonding. DHA-S inhibited the esterase activity of HSA. Molecular docking demonstrated that the binding site of DHA-S on HSA located at the cavity of subdomains IIA and IIIA, but the amino acids related to esterase activity of HSA were not in the binding pocket, indicating that the mechanism by which DHA-S inhibited HSA esterase activity was the change in protein structure. CONCLUSION This study illustrated that DHA-S interacted with HSA and the structure and function of HSA were affected by DHA-S. This research could help to understand the toxicity of DHA-S and provide basic data for safe use of food additives. © 2021 Society of Chemical Industry.
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Affiliation(s)
- Mengchen Xu
- School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao, P. R. China
| | - Zhaohao Cui
- Qingdao Research Academy of Environmental Sciences, Qingdao, P. R. China
| | - Yihua Xiao
- School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao, P. R. China
| | - Changqing Liu
- School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao, P. R. China
| | - Rutao Liu
- School of Environmental Science and Engineering, Shandong University, China-America CRC for Environment & Health, Qingdao, P. R. China
| | - Wansong Zong
- College of Population, Resources and Environment, Shandong Normal University, Jinan, P. R. China
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21
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Rajendran D, Chandrasekaran N, Waychal Y, Mukherjee A. Nanoplastics alter the conformation and activity of human serum albumin. NANOIMPACT 2022; 27:100412. [PMID: 35934234 DOI: 10.1016/j.impact.2022.100412] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2022] [Revised: 07/07/2022] [Accepted: 07/29/2022] [Indexed: 06/15/2023]
Abstract
Nanoplastics finds its presence in most of the consumer products. Their chance of coming in contact with human cells and components is rampant. This study focuses on the interaction of polystyrene nanoplastics (PSNPs) with human serum albumin (HSA), ultimately causing structural and functional properties of the protein. Fluorescence and UV-Visible spectroscopic studies reported that PSNPs form a spontaneous ground-state complex with HSA, by hydrogen bonding, van der waal's, and hydrophobic force of attraction. This causes changes in the environment around major aromatic amino acids, especially tryptophan-214, which has a strong affinity with PSNPs. Further docking analysis confirmed hydrophobic interactions between PSNPs and aromatic amino acids in subdomain IIA of HSA. A shift in amide bands in HSA, as determined by FTIR analysis confirmed the disturbances in its secondary structure followed by reordering which will lead to the unfolding of HSA. Besides, PSNPs reduce the esterase activity of HSA by competitive inhibition. This molecular-level information such as binding energy, binding site, binding forces, reversible or irreversible binding, and structural changes of protein will shed light on the extent of toxicity in humans. This study will emphasize the urgent need for regulation of the use of nanoplastics (NPs) in consumer products, as well as the need for more research to determine the fate of NPs in the biological system.
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Affiliation(s)
- Durgalakshmi Rajendran
- Centre for Nanobiotechnology, Vellore Institute of Technology, Vellore 632014, Tamil Nadu, India
| | - Natarajan Chandrasekaran
- Centre for Nanobiotechnology, Vellore Institute of Technology, Vellore 632014, Tamil Nadu, India.
| | - Yojana Waychal
- Centre for Nanobiotechnology, Vellore Institute of Technology, Vellore 632014, Tamil Nadu, India
| | - Amitava Mukherjee
- Centre for Nanobiotechnology, Vellore Institute of Technology, Vellore 632014, Tamil Nadu, India
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22
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Inclusion complex of 20(S)-protopanaxatriol with modified β-cyclodextrin: Characterization, solubility, and interaction with bovine serum albumin. Anal Biochem 2022; 653:114753. [PMID: 35691377 DOI: 10.1016/j.ab.2022.114753] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Revised: 05/16/2022] [Accepted: 05/25/2022] [Indexed: 11/22/2022]
Abstract
20(S)-protopanaxatriol (PPT) is one of the ginsenosides isolated from Panax ginseng which have many pharmaceutical activities. However, the poor water solubility of PPT restrict its applications. Herein, a novel bridged-bis-[6-(3,3'-(ethylenedioxy) bis (propylamine))-6-deoxy-β-cyclodextrin] (EDBA-bis-β-CD) was designed and synthesized, and the inclusion complex (IC) of EDBA-bis-β-CD with PPT was successfully prepared in the solid state, and characterized by UV, 1H NMR, 2D ROESY, FT-IR, XRD and SEM and molecular modelling methods. The continuous variation method analysis indicated that the stoichiometry of the IC was 1:1. UV-vis spectral analysis demonstrated the binding constant Ks was 995.94 M-1, and the solubility study showed that the solubility of PPT improved 290 times. The interaction of the IC with bovine serum albumin (BSA) was investigated via fluorescence spectroscopy. The results indicated that fluorescence quenching of BSA by IC was static quenching. Thermodynamic studies showed that van der Waals forces and hydrogen bonding play significant roles in interaction. The esterase-like activity of BSA in the presence of IC showed that it reduce the esterase activity of BSA in a competitive manner. Furthermore, molecular docking and molecular dynamics simulations for EDBA-bis-β-CD/PPT and BSA/IC systems were generated to provide information on the stability and the forces in the binding.
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23
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Vinod SM, Sangeetha MS, Thamarai Selvan R, Shoba G, Tamizhdurai P, Kumaran R. Molecular docking approach on the molecular interactions involving beta-lactoglobulin (βLG)-4-Dicyanomethylene2,6-Dimethyl-4-Hpyran (DDP) dye in the presence of an antibiotic, norfloxacin. J INDIAN CHEM SOC 2022. [DOI: 10.1016/j.jics.2022.100477] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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24
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Khashkhashi-Moghadam S, Ezazi-Toroghi S, Kamkar-Vatanparast M, Jouyaeian P, Mokaberi P, Yazdyani H, Amiri-Tehranizadeh Z, Reza Saberi M, Chamani J. Novel perspective into the interaction behavior study of the cyanidin with human serum albumin-holo transferrin complex: Spectroscopic, calorimetric and molecular modeling approaches. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.119042] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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25
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Binding affinity of curcumin to bovine serum albumin enhanced by pulsed electric field pretreatment. Food Chem 2022; 377:131945. [PMID: 34999459 DOI: 10.1016/j.foodchem.2021.131945] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2021] [Revised: 12/21/2021] [Accepted: 12/21/2021] [Indexed: 11/21/2022]
Abstract
The present study investigated the effect of pulsed electric field (PEF) pretreatment on the interaction between bovine serum albumin (BSA) and curcumin. Fluorescence quenching results showed that proper PEF pretreatment significantly increased the binding affinity of curcumin and BSA, the binding constant increased by 6.77 times under the conditions of 15 kV/cm for 0.51 ms. However, at higher PEF strength (≥25 kV/cm) and longer processing time (≥0.68 ms), the binding affinity was weakened. PEF pretreatment made the protein structure more disordered and induced partial unfolding of BSA, exposing more hydrophobic regions, thereby increasing the binding affinity to curcumin. PEF-treated BSA (PBSA) possessed better encapsulation efficiency (95.19%) and loading capacity (5.25 mg/g) for curcumin, and the storage stability of curcumin were enhanced by the formation of a complex with PBSA. This study provides new insights into the design of BSA-based delivery systems for curcumin and other hydrophobic nutrients.
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Naik R, Seetharamappa J. Elucidating the binding mechanism of an antimigraine agent with a model protein: insights from molecular spectroscopic, calorimetric and computational approaches. J Biomol Struct Dyn 2022; 41:3686-3701. [PMID: 35322751 DOI: 10.1080/07391102.2022.2053747] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Sumatriptan (SUM), a serotonin activator used to treat migraines and cluster headaches. Molecular spectroscopic methods including fluorescence quenching, time dependent fluorescence, FRET, absorption, circular dichroism, differential scanning calorimetric and computational approaches were employed to unravel the interaction between sumatriptan and bovine serum albumin (BSA). The fluorescence quenching studies suggested the interaction between SUM and BSA with a moderate binding with the binding constant (Kb) in the order of 104. The findings of temperature and time dependent fluorescence quenching studies confirmed the role of static quenching mechanism. Thermodynamic parameters suggested the key role of electrostatic force in the interaction of SUM with BSA. Absorption and CD spectral studies revealed the bioenvironmental changes around the Trp in BSA upon binding of SUM. Calorimetric based thermal denaturation results confirmed that the thermal stability of BSA was improved in the presence of SUM. resulted in the this decreased flexibility of protein chain. Site competitive studies indicated SUM was located in the hydrophobic cavity of site I which was further confirmed by the docking and dynamic simulation studies. Additionally, molecular dynamics simulations inferred the microenvironmental condition around the SUM and the amino acids and forces involved in the binding of SUM with BSA.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Roopa Naik
- Department of Chemistry, Karnatak University, Dharwad, Karnataka, India
| | - J Seetharamappa
- Department of Chemistry, Karnatak University, Dharwad, Karnataka, India
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27
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Zare F, Janeca A, Jokar SM, Faria M, Gonçalves MC. Interaction of Human Serum Albumin with Uremic Toxins: The Need of New Strategies Aiming at Uremic Toxins Removal. MEMBRANES 2022; 12:membranes12030261. [PMID: 35323736 PMCID: PMC8953794 DOI: 10.3390/membranes12030261] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/29/2021] [Revised: 02/06/2022] [Accepted: 02/07/2022] [Indexed: 12/04/2022]
Abstract
Chronic kidney disease (CKD) is acknowledged worldwide to be a grave threat to public health, with the number of US end-stage kidney disease (ESKD) patients increasing steeply from 10,000 in 1973 to 703,243 in 2015. Protein-bound uremic toxins (PBUTs) are excreted by renal tubular secretion in healthy humans, but hardly removed by traditional haemodialysis (HD) in ESKD patients. The accumulation of these toxins is a major contributor to these sufferers’ morbidity and mortality. As a result, some improvements to dialytic removal have been proposed, each with their own upsides and drawbacks. Longer dialysis sessions and hemodiafiltration, though, have not performed especially well, while larger dialyzers, coupled with a higher dialysate flow, proved to have some efficiency in indoxyl sulfate (IS) clearance, but with reduced impact on patients’ quality of life. More efficient in removing PBUTs was fractionated plasma separation and adsorption, but the risk of occlusive thrombosis was worryingly high. A promising technique for the removal of PBUTs is binding competition, which holds great hopes for future HD. This short review starts by presenting the PBUTs chemistry with emphasis on the chemical interactions with the transport protein, human serum albumin (HSA). Recent membrane-based strategies targeting PBUTs removal are also presented, and their efficiency is discussed.
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Affiliation(s)
- Fahimeh Zare
- Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal;
- Centro de Química Estrutural (CQE), 1049-001 Lisboa, Portugal
| | - Adriana Janeca
- Center of Physics and Engineering of Advanced Materials (CeFEMA), Laboratory for Physics of Materials and Emerging Technologies (LaPMET), Chemical Engineering Department, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisbon, Portugal; (A.J.); (M.F.)
| | - Seyyed M. Jokar
- Department of Chemical, Petroleum and Gas Engineering, Shiraz University of Technology, Shiraz 71557-13876, Iran;
| | - Mónica Faria
- Center of Physics and Engineering of Advanced Materials (CeFEMA), Laboratory for Physics of Materials and Emerging Technologies (LaPMET), Chemical Engineering Department, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisbon, Portugal; (A.J.); (M.F.)
| | - Maria Clara Gonçalves
- Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal;
- Centro de Química Estrutural (CQE), 1049-001 Lisboa, Portugal
- Correspondence:
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Biochemical and Biophysical Characterisation of the Hepatitis E Virus Guanine-7-Methyltransferase. Molecules 2022; 27:molecules27051505. [PMID: 35268608 PMCID: PMC8911963 DOI: 10.3390/molecules27051505] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2021] [Revised: 02/09/2022] [Accepted: 02/18/2022] [Indexed: 11/21/2022] Open
Abstract
Hepatitis E virus (HEV) is an understudied pathogen that causes infection through fecal contaminated drinking water and is prominently found in South Asian countries. The virus affects ~20 million people annually, leading to ~60,000 infections per year. The positive-stranded RNA genome of the HEV genotype 1 has four conserved open reading frames (ORFs), of which ORF1 encodes a polyprotein of 180 kDa in size, which is processed into four non-structural enzymes: methyltransferase (MTase), papain-like cysteine protease, RNA-dependent RNA polymerase, and RNA helicase. MTase is known to methylate guanosine triphosphate at the 5′-end of viral RNA, thereby preventing its degradation by host nucleases. In the present study, we cloned, expressed, and purified MTase spanning 33–353 amino acids of HEV genotype 1. The activity of the purified enzyme and the conformational changes were established through biochemical and biophysical studies. The binding affinity of MTase with magnesium ions (Mg2+) was studied by isothermal calorimetry (ITC), microscale thermophoresis (MST), far-UV CD analysis and, fluorescence quenching. In summary, a short stretch of nucleotides has been cloned, coding for the HEV MTase of 37 kDa, which binds Mg2+ and modulate its activity. The chelation of magnesium reversed the changes, confirming its role in enzyme activity.
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29
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Hekmat A, Hatamie S, Saboury AA. The effects of synthesized silver nanowires on the structure and esterase-like activity of human serum albumin and their impacts on human endometrial stem cells. INORG NANO-MET CHEM 2022. [DOI: 10.1080/24701556.2022.2034859] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Azadeh Hekmat
- Department of Biology, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Shadie Hatamie
- Institute of NanoEngineering and MicroSystems, National Tsing Hua University, Hsinchu, Taiwan
- Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu, Taiwan
| | - Ali Akbar Saboury
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran
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Szymaszek P, Fiedor P, Chachaj-Brekiesz A, Tyszka-Czochara M, Świergosz T, Ortyl J. Molecular interactions of bovine serum albumin (BSA) with pyridine derivatives as candidates for non-covalent protein probes: a spectroscopic investigation. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2021.118262] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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31
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Chen R, He RJ, Guo D, Zhang ZF, Zhang WG, Fan J. Interactions of diclazuril enantiomers with serum albumins: Multi-spectroscopic and molecular docking approaches. J Mol Recognit 2022; 35:e2948. [PMID: 35094438 DOI: 10.1002/jmr.2948] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Revised: 11/30/2021] [Accepted: 12/16/2021] [Indexed: 01/17/2023]
Abstract
In this work, multi-spectroscopic and molecular docking methods have been conducted in the investigation of enantioselective interactions between diclazuril enantiomers and human/bovine serum albumins (HSA/BSA). The binding constants between serum albumins (SAs) and diclazuril enantiomers revealed that SAs exhibited stronger binding affinity for (R)-diclazuril than (S)-enantiomer. In addition, the fluorescence quenching of SAs induced by diclazuril enantiomers was ascribed to static quenching mechanism, in which hydrogen bonds and Van der Waals forces were the main interactions. According to the thermodynamic study, binding of diclazuril enantiomers and SAs was an exothermic process driven by enthalpy change. Then, circular dichroism spectroscopy of SAs with diclazuril enantiomers revealed that the SAs conformation had changed in the presence of diclazuril. Moreover, molecular docking technology was applied in exploration of interactions between SAs and diclazuril enantiomers. The docking energy between SAs and (R)-diclazuril was larger than (S)-diclazuril, which indicated that the affinity of SAs with (R)-diclazuril was stronger than (S)-enantiomer. This work may provide valuable information for explaining differences in pharmacokinetics and residue elimination of diclazuril enantiomers in living organisms.
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Affiliation(s)
- Ran Chen
- School of Chemistry, Guangzhou Key Laboratory of Analytical Chemistry for Biomedicine, South China Normal University, Guangzhou, China
| | - Ru-Jian He
- School of Chemistry, Guangzhou Key Laboratory of Analytical Chemistry for Biomedicine, South China Normal University, Guangzhou, China
| | - Dong Guo
- School of Chemistry, Guangzhou Key Laboratory of Analytical Chemistry for Biomedicine, South China Normal University, Guangzhou, China.,Guangzhou Research & Creativity Biotechnology Co. Ltd., Guangzhou, China
| | - Zhi-Feng Zhang
- School of Chemistry, Guangzhou Key Laboratory of Analytical Chemistry for Biomedicine, South China Normal University, Guangzhou, China
| | - Wei-Guang Zhang
- School of Chemistry, Guangzhou Key Laboratory of Analytical Chemistry for Biomedicine, South China Normal University, Guangzhou, China
| | - Jun Fan
- School of Chemistry, Guangzhou Key Laboratory of Analytical Chemistry for Biomedicine, South China Normal University, Guangzhou, China
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32
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Ishtikhar M, Siddiqui Z, Ahmad A, Ashraf JM, Arshad M, Doctor N, Al-Kheraif AA, Zamzami MA, Al-Thawadi SM, Kim J, Khan RH. Phytochemical thymoquinone prevents hemoglobin glycoxidation and protofibrils formation: A biophysical aspect. Int J Biol Macromol 2021; 190:508-519. [PMID: 34481855 DOI: 10.1016/j.ijbiomac.2021.08.202] [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: 01/17/2021] [Revised: 07/16/2021] [Accepted: 08/27/2021] [Indexed: 11/30/2022]
Abstract
d-ribose, a reducing sugar, in diabetic hyperglycemia provokes non-enzymatic glycoxidation of hemoglobin (Hb), an abundant protein of red blood cells (RBCs). Different types of intermediates adduct formation occur during glycoxidation, such as advanced glycation end-products (AGEs) which lead to amyloid formation due to structural and conformational alterations in protein. Therefore, the study of these intermediate adducts plays a pivotal role to discern their relationship with diabetes mellitus and related disorders. Here, we investigated the interaction mechanism of d-ribose with Hb, and Hb prebound phytochemical thymoquinone (TQ). Our investigation reveals that the interaction of TQ with histidine residues of Hb interferes with the interaction of d-ribose with glycine residues at the glycation-site. Based on that, we had performed a time-based (21-days) in-vitro glycoxidation study at 37 °C to investigate the structural perturbation mechanism of Hb at different time-intervals in absence/presence of TQ. We found that prolonged glycoxidation induces amyloid formation in absence of TQ but in its presence, the process was prohibited. In summary, this study examined and characterized biophysically different intermediate-states of protein carrying glycoxidation-modification. Our findings suggested that TQ potentially affects interaction of d-ribose with Hb that prevents glycoxidation and protofibril formation, which establishes TQ as a potential therapeutic agent.
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Affiliation(s)
- Mohd Ishtikhar
- Department of Chemistry, Indian Institute of Technology-Bombay, Mumbai 400076, India.
| | - Zeba Siddiqui
- Department of Biosciences, Integral University, Lucknow 226026, India
| | - Abrar Ahmad
- Department of Biochemistry, Faculty of Sciences, King Abdul-Aziz University, Jeddah 21589, Saudi Arabia
| | - Jalaluddin Mohammad Ashraf
- Department of Medical Laboratory Technology, Applied Medical Sciences, Jazan University, Jazan 45142, Saudi Arabia
| | - Mohammed Arshad
- Dental Biomaterials Research Chair, Dental Health Department, College of Applied Medical Sciences, King Saud University, P. O. Box: 10219, Riyadh 11433, Saudi Arabia
| | - Ninad Doctor
- Department of Chemistry, East Carolina University, NC 27834-4354, USA
| | - Abdulaziz A Al-Kheraif
- Dental Biomaterials Research Chair, Dental Health Department, College of Applied Medical Sciences, King Saud University, P. O. Box: 10219, Riyadh 11433, Saudi Arabia
| | - Mazin A Zamzami
- Department of Biochemistry, Faculty of Sciences, King Abdul-Aziz University, Jeddah 21589, Saudi Arabia
| | | | - Jihoe Kim
- Department of Medical Biotechnology and Reasech Institute of Cell Culture, YeungNam University, Gyeongsan 38541, Korea
| | - Rizwan Hassan Khan
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh 202002, India
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Long L, Tan X, Liu Z, Liu Y, Cao X, Shi C. Effects of Human Serum Albumin on the Fluorescence Intensity and Tumor Imaging Properties of IR-780 Dye. Photochem Photobiol 2021; 98:935-944. [PMID: 34687567 DOI: 10.1111/php.13547] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2021] [Revised: 09/23/2021] [Accepted: 10/21/2021] [Indexed: 11/29/2022]
Abstract
IR-780 is a lipophilic dye with excellent optical and tumor imaging properties for early tumor diagnostics. Although the mechanism of tumor targeting has not been fully identified, the view that serum albumin plays an important role in tumor accumulation has been recognized. Here, the mechanism of the interaction between IR-780 and HSA was studied to explore the effect of albumin on its tumor targeting properties. Data demonstrate that IR-780 can be tightly adsorbed by HSA at a ratio of 1:1 to form a noncovalent complex, which exhibits significant improvement in the near-infrared fluorescence imaging and tumor diagnosis capacity. During this process, the endogenous fluorescence and esterase activity of HSA are both partially inhibited by IR-780, and the α-helical content of HSA slightly increases. Molecular docking simulation displays that the binding site of IR-780 on HSA is between subdomains IIA and IIB. These results indicate that HSA is an important factor to mediate the optical performance of IR-780, giving it higher tumor diagnosis capability.
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Affiliation(s)
- Lei Long
- Laboratory of Trauma, Burns and Combined Injury, Department of Preventive Medicine, Third Military Medical University, Chongqing, China
| | - Xu Tan
- Laboratory of Trauma, Burns and Combined Injury, Department of Preventive Medicine, Third Military Medical University, Chongqing, China
| | - Zujuan Liu
- Laboratory of Trauma, Burns and Combined Injury, Department of Preventive Medicine, Third Military Medical University, Chongqing, China
| | - Yunsheng Liu
- Laboratory of Trauma, Burns and Combined Injury, Department of Preventive Medicine, Third Military Medical University, Chongqing, China
| | - Xiaohui Cao
- Laboratory of Trauma, Burns and Combined Injury, Department of Preventive Medicine, Third Military Medical University, Chongqing, China
| | - Chunmeng Shi
- Laboratory of Trauma, Burns and Combined Injury, Department of Preventive Medicine, Third Military Medical University, Chongqing, China
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Insights on the interaction mechanism of exemestane to three digestive enzymes by multi-spectroscopy and molecular docking. Int J Biol Macromol 2021; 187:54-65. [PMID: 34274402 DOI: 10.1016/j.ijbiomac.2021.07.079] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2021] [Revised: 07/06/2021] [Accepted: 07/12/2021] [Indexed: 01/27/2023]
Abstract
Exemestane is an irreversible steroidal aromatase inhibitor, typically used to treat breast cancer. As an anti-tumor drug, exemestane has more obvious side effects on the gastrointestinal tract. The purpose of this work is to investigate the combination of exemestane with three important digestive enzymes including pepsin (Pep), trypsin (Try) and α-Chymotrypsin (α-ChT) so as to analyze the mechanism of the gastrointestinal adverse effects causing by exemestane binding. Enzyme activity experiment showed that the enzyme activity of Pep was decreased in the presence of exemestane. Fluorescence spectra revealed that exemestane formed stable complexes with digestive enzymes, and the quenching mechanism of drug-digestive enzymes interaction were all static quenching. The binding constants of Pep, Try and α-ChT at 298 K were 2.34 × 105, 1.45 × 105, and 2.05 × 105 M-1, respectively. Synchronous fluorescence and 3D fluorescence spectroscopy showed that the conformation of exemestane was slightly changed after combining with digestive enzymes, and non-radiative energy transfer occurred. Circular dichroism results indicated that exemestane could change the secondary structure of digestive enzymes via increase the α-helix content and decrease in the β-sheet content. Thermodynamic parameters (ΔH0, ΔS0, and ΔG0) revealed that exemestane interacted with α-ChT through electrostatic force, and the binding force with Pep and Try was van der Waals interactions and hydrogen, which was basically consistent with the molecular docking results.
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Ribeiro AG, Alves JEF, Soares JCS, dos Santos KL, Jacob ÍTT, da Silva Ferreira CJ, dos Santos JC, de Azevedo RDS, de Almeida SMV, de Lima MDCA. Albumin roles in developing anticancer compounds. Med Chem Res 2021. [DOI: 10.1007/s00044-021-02748-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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Al Jaseem MAJ, Abdullah KM, Qais FA, Shamsi A, Naseem I. Mechanistic insight into glycation inhibition of human serum albumin by vitamin B9: Multispectroscopic and molecular docking approach. Int J Biol Macromol 2021; 181:426-434. [PMID: 33775768 DOI: 10.1016/j.ijbiomac.2021.03.153] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2021] [Revised: 03/09/2021] [Accepted: 03/23/2021] [Indexed: 10/21/2022]
Abstract
Advanced glycation end products (AGEs) formation produces free radicals that play a role in diabetes mellitus; hence inhibition of glycation plays a part in minimizing diabetes-related complications. This study was intended to examine the AGEs formation of HSA upon prolonged incubation of 28 days at 37 °C and further investigate the antiglycation potential of folic acid (FA). FA shows a significant binding affinity to the HSA with a binding constant (K) of 104 M-1. The evaluation of enthalpy change (∆H0) and entropy change (∆So) implied that the HSA-FA complex is stabilized primarily by hydrophobic interaction and hydrogen bonding. Molecular docking analysis depicted that FA binds with HSA in subdomain IIA (Sudlow's site I) with a binding energy of -7.0 kcal mol-1. AGEs were characterized by free lysine and thiol groups, carbonyl content, and AGEs specific fluorescence. The presence of FA significantly decreased glycation from free lysine and carbonyl content estimation and AGEs specific fluorescence. Multispectroscopic observations and molecular docking and examination of various biomarkers demonstrate the antiglycation activity of FA and its capacity to prevent disease progression in diabetes.
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Affiliation(s)
| | - K M Abdullah
- Department of Biochemistry, Jain University, Bengaluru, India
| | - Faizan Abul Qais
- Department of Agricultural Microbiology, Aligarh Muslim University, India
| | - Anas Shamsi
- Centre of Medical and Bio-Allied Health Sciences Research, Ajman University, United Arab Emirates; Center for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia, Jamia Nagar, New Delhi 110025, India
| | - Imrana Naseem
- Department of Biochemistry, F/O Life Sciences, Aligarh Muslim University, India.
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Mrkalić E, Jelić R, Stojanović S, Sovrlić M. Interaction between olanzapine and human serum albumin and effect of metal ions, caffeine and flavonoids on the binding: A spectroscopic study. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2021; 249:119295. [PMID: 33338934 DOI: 10.1016/j.saa.2020.119295] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/21/2020] [Revised: 11/03/2020] [Accepted: 11/29/2020] [Indexed: 06/12/2023]
Abstract
In this study, the binding of olanzapine (OLZ) to human serum albumin (HSA) and the influence of metal ions (Ca2+, Mg2+, Cu2+, Zn2+, Fe3+), caffeine (CAF) and flavonoids (diosmin (DIO), catechin (CAT), quercetin (QUE)), on their affinity, was investigated by fluorescence spectroscopy and UV-vis absorption spectroscopy. Fluorescence experiments suggest that OLZ quench the fluorescence of HSA through the mixed quenching mechanism and non-radiation energy transferring as a result of the HSA-OLZ complex formation. OLZ spontaneously bind in the site I on HSA, and according to thermodynamic parameters, the reaction was spontaneous and mainly driven by hydrogen bonds and van der Waals interactions. The presence of Mn+ ions, CAF, DIO and CAT decreased binding affinity between OLZ and HSA which indicates that they could compete against OLZ in the site I. Contrary, in the presence of QUE the binding affinity of the HSA-OLZ system enhanced, which may be explained by conformational changes in HSA (non-competitive interference).
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Affiliation(s)
- Emina Mrkalić
- University of Kragujevac, Institute for Information Technologies, Department of Science, Jovana Cvijića bb, Kragujevac 34000, Serbia
| | - Ratomir Jelić
- University of Kragujevac, Faculty of Medical Sciences, Department of Pharmacy, Svetozara Markovića 69, Kragujevac 34000, Serbia.
| | - Stefan Stojanović
- University of Kragujevac, Faculty of Medical Sciences, Department of Pharmacy, Svetozara Markovića 69, Kragujevac 34000, Serbia
| | - Miroslav Sovrlić
- University of Kragujevac, Faculty of Medical Sciences, Department of Pharmacy, Svetozara Markovića 69, Kragujevac 34000, Serbia
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Thakur A, Patwa J, Pant S, Sharma A, Flora SJS. Interaction study of monoisoamyl dimercaptosuccinic acid with bovine serum albumin using biophysical and molecular docking approaches. Sci Rep 2021; 11:4068. [PMID: 33603022 PMCID: PMC7892868 DOI: 10.1038/s41598-021-83534-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Accepted: 02/04/2021] [Indexed: 12/21/2022] Open
Abstract
Monoisoamyl 2,3-dimercaptosuccinic acid (MiADMSA), a lipophilic chelator has been evaluated for its potential use as an antidote in arsenic poisoning. The pharmacokinetics and pharmacodynamics properties of a drug could be understood via study its mechanism of interaction with bovine serum albumin protein (BSA). Therefore, the interaction between MiADMSA with BSA was investigated using various spectroscopic techniques and computational methods. Linear quenching of BSA intrinsic fluorescence intensity with the increasing concentration of MiADMSA was observed in the fluorescence study. Furthermore, synchronous results revealed that MiADMSA slightly changed the conformation of BSA. The binding constant value of the BSA-MiADMSA complex was found 1.60 × 104 M-1 at 298 K. The value of thermodynamic parameters ΔG, ΔH, and ΔS described that the process is spontaneous, endothermic, and hydrophobic forces are involved in the interaction of MiADMSA with BSA. Competitive site marker experiments showed that MiADMSA binds to site-II of BSA. Conformational changes of BSA with the interaction of MiADMSA were apparent by CD, UV-Visible, FT-IR, and 3D fluorescence spectroscopy. To strengthen the experimental findings we have also performed a theoretical study on the BSA-MiADMSA complex. Two sites were identified with docking score of - 6.642 kcal/mol at site IIa and - 3.80 kcal/mol for site IIb via molecular docking study. Molecular dynamics simulation study inferred the stability of the BSA-MiADMSA complex which was analyzed in a long simulation run. The experimental and computational studies have shown the effective binding of MiADMSA with BSA which is essential for the transportation and elimination of a drug from the body.
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Affiliation(s)
- Ashima Thakur
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research, Raebareli, Lucknow, UP, 226002, India
| | - Jayant Patwa
- Department of Pharmacology and Toxicology, National Institute of Pharmaceutical Education and Research, Raebareli, Lucknow, UP, 226002, India
| | - Suyash Pant
- Department of Pharmacoinformatics, National Institute of Pharmaceutical Education and Research, Kolkata, India
| | - Abha Sharma
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research, Raebareli, Lucknow, UP, 226002, India.
| | - S J S Flora
- Department of Pharmacology and Toxicology, National Institute of Pharmaceutical Education and Research, Raebareli, Lucknow, UP, 226002, India.
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Maurya N, Patel R. Comparative binding analysis of noscapine and piperine with tRNA: A structural perturbation and energetic study. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2021; 247:119089. [PMID: 33126137 DOI: 10.1016/j.saa.2020.119089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2020] [Revised: 10/05/2020] [Accepted: 10/10/2020] [Indexed: 06/11/2023]
Abstract
In this study, we have exploring the binding mechanisms of the two anticancer alkaloid noscapine (NOS) and piperine (PIP) with tRNA using different spectroscopy and computational method. Absorbance and emission spectra revealed that both the drugs show strong binding with tRNA, where NOS intercalate between the base pairs of tRNA and PIP binds in the groove of tRNA. Competitive binding study and steady state anisotropy further confirms the intercalative mode of binding between NOS and tRNA and groove binding in PIP-tRNA complex. The observed thermodynamic parameters suggested that NOS-tRNA complex formation is endothermic and entropy driven, however it was exothermic, and enthalpy driven in case of PIP-tRNA complex. CD and time resolved fluorescence studies show the structural perturbations and conformational change in tRNA structure with NOS as well as PIP. Molecular docking studies are comparable with experimental results and further confirmed that the hydrophobic interactions involved in the NOS-tRNA binding, whereas hydrogen binding and van der Waals interactions play important role in the PIP-tRNA complex formation. This study can be useful to understand the potential binding and resultant tRNA damage by alkaloids and deigned new target specific anticancer drug.
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Affiliation(s)
- Neha Maurya
- Biophysical Chemistry Laboratory, Centre for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia, New Delhi 110025, India
| | - Rajan Patel
- Biophysical Chemistry Laboratory, Centre for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia, New Delhi 110025, India.
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Lu YC, Wu CC, Tsai IT, Hung WC, Lee TL, Hsuan CF, Yu TH, Wei CT, Chung FM, Lee YJ, Wang CP. Associations among total p-cresylsulfate, indoxyl sulfate and hippuric acid levels with hemodialysis quality indicators in maintenance hemodialysis patients. Clin Chim Acta 2021; 516:83-91. [PMID: 33508250 DOI: 10.1016/j.cca.2021.01.015] [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: 07/14/2020] [Revised: 01/14/2021] [Accepted: 01/20/2021] [Indexed: 10/22/2022]
Abstract
BACKGROUND Total p-cresylsulfate (PCS), indoxyl sulfate (IS) and hippuric acid (HA) are harmful uremic toxins known to be elevated in patients with uremia. Serum total PCS, IS and HA levels have been associated with coronary atherosclerosis, left ventricular hypertrophy, metabolic acidosis, neurological symptoms, and accelerated renal damage associated with chronic kidney disease; however, no study has examined the effect of total PCS, IS and HA on hemodialysis (HD) quality indicators. The aim of this study was to examine associations among total PCS, IS and HA with HD quality indicators in patients undergoing HD treatment. METHODS This study included 264 consecutive patients at a single HD center who assessed using previously demonstrated HD quality indicators including anemia, bone-mineral metabolism, dialysis dose, cardiovascular risk, and middle molecule removal area. Serum HA was measured using a capillary electrophoresis method. Serum total PCS and IS concentrations were measured using an Ultra Performance LC System. RESULTS Multiple regression analysis showed that sex, potassium, systolic blood pressure (SBP), average BP, β2-microglobulin, and creatinine were independently positively associated with IS level, and that age, total cholesterol, and estimated glomerular filtration rate (eGFR) was independently negatively associated with IS level. In addition, β2-microglobulin was independently positively associated with total PCS. Moreover, potassium, diastolic blood pressure, average BP, β2-microglobulin, dialysis vintage, and albumin were independently positively associated with HA level, and age, transferrin saturation, fasting glucose, and eGFR were independently negatively associated with HA level. When the patients were stratified by age and sex, serum IS and HA levels were still independently associated with some hemodialysis quality indicators. In addition, canonical correlation analysis also confirmed the relationship between uremic toxins (IS and HA) and HD quality indicators (potassium, β2-microglobulin, average BP, creatinine, and eGFR). CONCLUSION This study demonstrated that uremic toxins (IS and HA) and HD quality indicators (potassium, β2-microglobulin, average BP, creatinine, and eGFR) constructs were correlated with each other, and that there were sex and age differences in these associations among maintenance HD patients.
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Affiliation(s)
- Yung-Chuan Lu
- Division of Endocrinology and Metabolism, Department of Internal Medicine, E-Da Hospital, Kaohsiung 82445, Taiwan; School of Medicine for International Students, College of Medicine, I-Shou University, Kaohsiung 82445, Taiwan
| | - Cheng-Ching Wu
- Division of Cardiology, Department of Internal Medicine, E-Da Hospital, Kaohsiung 82445, Taiwan; The School of Chinese Medicine for Post Baccalaureate, College of Medicine, I-Shou University, Kaohsiung 82445, Taiwan; Division of Cardiology, Department of Internal Medicine, E-Da Cancer Hospital, Kaohsiung 82445, Taiwan
| | - I-Ting Tsai
- Department of Emergency, E-Da Hospital, Kaohsiung 82445, Taiwan; School of Medicine, College of Medicine, I-Shou University, Kaohsiung 82445, Taiwan
| | - Wei-Chin Hung
- Division of Cardiology, Department of Internal Medicine, E-Da Hospital, Kaohsiung 82445, Taiwan; School of Medicine, College of Medicine, I-Shou University, Kaohsiung 82445, Taiwan
| | - Thung-Lip Lee
- Division of Cardiology, Department of Internal Medicine, E-Da Hospital, Kaohsiung 82445, Taiwan; School of Medicine for International Students, College of Medicine, I-Shou University, Kaohsiung 82445, Taiwan
| | - Chin-Feng Hsuan
- Division of Cardiology, Department of Internal Medicine, E-Da Hospital, Kaohsiung 82445, Taiwan; School of Medicine, College of Medicine, I-Shou University, Kaohsiung 82445, Taiwan
| | - Teng-Hung Yu
- Division of Cardiology, Department of Internal Medicine, E-Da Hospital, Kaohsiung 82445, Taiwan; The School of Chinese Medicine for Post Baccalaureate, College of Medicine, I-Shou University, Kaohsiung 82445, Taiwan
| | - Ching-Ting Wei
- Division of General Surgery, Department of Surgery, E-Da Hospital, Kaohsiung 82445, Taiwan; School of Medicine for International Students, College of Medicine, I-Shou University, Kaohsiung 82445, Taiwan; Department of Biomedical Engineering, I-Shou University, Kaohsiung 82445, Taiwan; Department of Electrical Engineering, I-Shou University, Kaohsiung 82445, Taiwan
| | - Fu-Mei Chung
- Division of Cardiology, Department of Internal Medicine, E-Da Hospital, Kaohsiung 82445, Taiwan
| | | | - Chao-Ping Wang
- Division of Cardiology, Department of Internal Medicine, E-Da Hospital, Kaohsiung 82445, Taiwan; School of Medicine for International Students, College of Medicine, I-Shou University, Kaohsiung 82445, Taiwan.
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Sarmah RJ, Kundu S. Structure, morphology and reversible hysteresis nature of human serum albumin (HSA) monolayer on water surface. Int J Biol Macromol 2021; 174:377-384. [PMID: 33485891 DOI: 10.1016/j.ijbiomac.2021.01.131] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2020] [Revised: 12/21/2020] [Accepted: 01/19/2021] [Indexed: 11/30/2022]
Abstract
Compression-decompression surface pressure (π)-specific molecular area (A) isotherm cycle of human serum albumin (HSA) monolayer is performed on water surface at four different subphase pH conditions, i.e., below and above the isoelectric point (pI ≈ 4.7) of HSA molecule. For all pH conditions, the decompression curve nearly follows the compression curve, however, at pH ≈ 5.0, hysteresis is observed at higher surface pressure. Out-of-plane structures and in-plane morphologies obtained from the X-ray reflectivity and AFM studies show that only the film thickness variation takes place with the change in surface pressure, which is also evidenced from the BAM images. With increase in surface pressure, the oblate-shaped HSA molecules start tilting making an angle with the water surface and as the monolayer is decompressed the molecules regain their initial untilted monomolecular configuration. Depending upon the subphase pH and local surface charge of the specific protein molecule, electrostatic repulsive interaction dominates over the van der Waals attraction and as a result decompression curve follows the compression curve as the molecules repel each other, however, closer to the isoelectric point as strength of the interactions reverses, a hysteresis is obtained at higher surface pressure and accordingly monolayer behaviour modifies on the water surface.
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Affiliation(s)
- Raktim J Sarmah
- Soft Nano Laboratory, Physical Sciences Division, Institute of Advanced Study in Science and Technology, Vigyan Path, Paschim Boragaon, Garchuk, Guwahati, Assam 781035, India
| | - Sarathi Kundu
- Soft Nano Laboratory, Physical Sciences Division, Institute of Advanced Study in Science and Technology, Vigyan Path, Paschim Boragaon, Garchuk, Guwahati, Assam 781035, India.
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Mohammadi S, Khajeh K, Taghdir M, Ranjbar B. An experimental investigation on the influence of various buffer concentrations, osmolytes and gold nanoparticles on lysozyme: Spectroscopic and calorimetric study. Int J Biol Macromol 2021; 172:162-169. [PMID: 33412205 DOI: 10.1016/j.ijbiomac.2020.12.208] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2020] [Revised: 12/27/2020] [Accepted: 12/29/2020] [Indexed: 11/27/2022]
Abstract
Considering importance and several industrial applications of lysozyme, including natural antibiotic and preservative, identifier for the diagnosis of diseases, and extraction purposes, its reversibility and stability studies can be very important. In this paper, the role that buffer and osmolytes concentrations play on the thermodynamic stability of lysozyme denaturation process, that is a new simple and inexpensive method, was evaluated by Nano-DSC III, far- and near-UV CD and fluorescence techniques. In thermal denaturation study, RI and ΔG of protein increased from 25.62% to 58.82% and 48.87 to 63.63 kJ mol-1 with the increment of buffer and osmolytes concentrations, respectively. These changes showed a significant increase of 129.59% in RI and 28.16% in ΔG. The effect of buffer and osmolytes concentrations on the secondary and tertiary structures of protein was also investigated. The results indicated that increment of buffer and osmolytes concentrations increase rigidity and thermodynamic stability of protein. Also, structure of protein may be changed by its interaction with GNPs. Hence, interaction of lysozyme with GNPs was studied at the buffer and osmolytes concentrations that gives the maximum RI and ΔG, respectively. The results showed that molten globule-like state was formed by lysozyme in the presence of GNPs.
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Affiliation(s)
- Soraya Mohammadi
- Department of Biophysics, Faculty of Biological Sciences, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran
| | - Khosro Khajeh
- Department of Biochemistry, Faculty of Biological Sciences, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran
| | - Majid Taghdir
- Department of Biophysics, Faculty of Biological Sciences, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran
| | - Bijan Ranjbar
- Department of Biophysics, Faculty of Biological Sciences, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran.
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43
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Xu P, Yang X, Wang Y. Inhibition of non-enzymatic glycation by capsaicin: targeting AGE-induced diabetic complications. NEW J CHEM 2021. [DOI: 10.1039/d1nj01783g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Capsaicin inhibits the non-enzymatic glycation of human serum albumin.
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Affiliation(s)
- Ping Xu
- Department of Endocrinology and Metabolism, Shenzhen People's Hospital (The Second Clinical Medical College, Jinan University. The First Affiliated Hospital, Southern University of Science and Technology), Shenzhen, 518020, China
| | - Xiaodong Yang
- Department of General Medicine, Zhumadian Central Hospital, Zhumadian, Henan, 463000, China
| | - Yu Wang
- Department of General Medicine, Xi’an People's Hospital (Xi’an Fourth Hospital), Xi’an, Shannxi Province, 710004, China
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Rafi Z, Alouffi S, Khan MS, Ahmad S. 2’-Deoxyribose Mediated Glycation Leads to Alterations in BSA Structure Via Generation of Carbonyl Species. Curr Protein Pept Sci 2020; 21:924-935. [DOI: 10.2174/1389203721666200213104446] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2019] [Revised: 11/01/2019] [Accepted: 01/11/2020] [Indexed: 12/11/2022]
Abstract
The non-enzymatic glycosylation is a very common phenomenon in the physiological
conditions which is mediated by distinct chemical entities containing reactive carbonyl species (RCS)
and participates in the modification of various macromolecules particularly proteins. To date, various
carbonyl species, i.e., glucose, fructose, D-ribose and methylglyoxal have been used frequently to
assess the in-vitro non-enzymatic glycosylation. Similarly, 2'-Deoxyribose is one of the most abundant
reducing sugar of the living organisms which forms the part of deoxyribonucleic acid and may react
with proteins leading to the production of glycation intermediates, advanced glycation end products
(AGEs) and highly reactive RCS. Thymidine phosphorylase derived degradation of thymidine
contributes to the formation of 2'-Deoxyribose, therefore, acting as a major source of cellular 2'-
Deoxyribose. Since albumin is a major serum protein which plays various roles including binding and
transporting endogenous and exogenous ligands, it is more prone to be modified through different
physiological modifiers; therefore, it may serve as a model protein for in-vitro experiments to study the
effect of 2’Deoxyribose mediated modific#039;-Deoxyribose followed by examining secondary and
tertiary structural modifications in BSA as compared to its native (unmodified) form by using various
physicochemical techniques. We evident a significant modification in 2'-Deoxyribose-glycated BSA
which was confirmed through increased hyperchromicity, keto amine moieties, carbonyl and
hydroxymethylfurfural content, fluorescent AGEs, altered secondary structure conformers (α helix and
β sheets), band shift in the amide-I region and diminished free lysine and free arginine content. These
modifications were reported to be higher in 100 mM 2'-Deoxyribose-glycated BSA than 50 mM 2'-
Deoxyribose-glycated BSA. Our findings also demonstrated that the rate of glycation is positively
affected by the increased concentration of 2'-Deoxyribose. The results of the performed study can be
implied to uncover the phenomenon of serum protein damage caused by 2'-Deoxyribose leading
towards diabetic complications and the number of AGE-related diseases.
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Affiliation(s)
- Zeeshan Rafi
- Department of Bioengineering, Integral University, Lucknow, 226026, UP, India
| | - Sultan Alouffi
- College of Applied Medical Sciences, University of Ha’il, Ha’il, Saudi Arabia
| | - Mohd Sajid Khan
- Department of Bioscience, Integral University, Lucknow, 226026, UP, India
| | - Saheem Ahmad
- College of Applied Medical Sciences, University of Ha’il, Ha’il, Saudi Arabia
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Gomes DC, Barros MR, Menezes TM, Neves JL, Paiva PMG, da Silva TG, Napoleão TH, Coriolano MC, Dos Santos Correia MT. A new lectin from the floral capitula of Egletes viscosa (EgviL): Biochemical and biophysical characterization and cytotoxicity to human cancer cells. Int J Biol Macromol 2020; 168:676-685. [PMID: 33220373 DOI: 10.1016/j.ijbiomac.2020.11.124] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Revised: 11/12/2020] [Accepted: 11/17/2020] [Indexed: 10/23/2022]
Abstract
Egletes viscosa is a plant with therapeutic value due to its antibacterial, antinociceptive and gastroprotective properties. This study aimed to purify, characterize, and evaluate the cytotoxicity of a lectin (EgviL) from the floral capitula of E. viscosa. The lectin was isolated from saline extract through precipitation with ammonium sulfate followed by Sephadex G-75 chromatography. The molecular mass and isoelectric point (pI) of EgviL were determined as well as its temperature and pH stability. Physical-chemical parameters of interaction between EgviL and carbohydrates were investigated by fluorescence quenching and 1H nuclear magnetic resonance (NMR). Cytotoxicity was investigated against human peripheral blood mononuclear cells (PBMCs) and neoplastic cells. EgviL (28.8 kDa, pI 5.4) showed hemagglutinating activity stable towards heating until 60 °C and at the pH range 5.0-7.0. This lectin is able to interact through hydrophobic and electrostatic bonds with galactose and glucose, respectively. EgviL reduced the viability of PBMCs only at the highest concentration tested (100 μg/mL) while was toxic to Jurkat E6-1 cells with IC50 of 24.1 μg/mL,inducing apoptosis. In summary, EgviL is a galactose/glucose-binding protein with acidic character, stable to heating and with cytotoxic effect on leukemic cells.
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Affiliation(s)
- Dayane Correia Gomes
- Departamento de Bioquímica, Centro de Biociências, Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil
| | - Marcela Rodrigues Barros
- Laboratório de Química Biológica, Departamento de Química Fundamental, Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil
| | - Thaís Meira Menezes
- Laboratório de Química Biológica, Departamento de Química Fundamental, Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil
| | - Jorge Luiz Neves
- Laboratório de Química Biológica, Departamento de Química Fundamental, Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil
| | - Patrícia Maria Guedes Paiva
- Departamento de Bioquímica, Centro de Biociências, Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil
| | - Teresinha Gonçalves da Silva
- Departamento de Antibióticos, Centro de Biociências, Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil
| | - Thiago Henrique Napoleão
- Departamento de Bioquímica, Centro de Biociências, Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil.
| | - Marília Cavalcanti Coriolano
- Departamento de Bioquímica, Centro de Biociências, Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil.
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Bessas NC, Silva LA, Comar Júnior M, Lima RG. Interaction of the nitrosyl ruthenium complex [Ru
II
(NH.NHq‐R)(tpy)NO]
3+
with human serum albumin: a spectroscopic and computational investigation. LUMINESCENCE 2020; 36:391-408. [DOI: 10.1002/bio.3955] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Revised: 07/07/2020] [Accepted: 09/07/2020] [Indexed: 01/01/2023]
Affiliation(s)
- Naiara Cristina Bessas
- Instituto de Ciências Exatas e Naturais do Pontal, ICENP Universidade Federal de Uberlândia Rua Vinte, 1600, 38304‐402, Tupã Ituiutaba MG Brazil
- Instituto de Química Universidade Federal de Uberlândia Avenida João Naves de Avila, 2121, 38400‐902 Uberlândia MG Brazil
| | - Letícia Alves Silva
- Instituto de Química Universidade Federal de Uberlândia Avenida João Naves de Avila, 2121, 38400‐902 Uberlândia MG Brazil
| | - Moacyr Comar Júnior
- Instituto de Química Universidade Federal de Uberlândia Avenida João Naves de Avila, 2121, 38400‐902 Uberlândia MG Brazil
| | - Renata Galvão Lima
- Instituto de Ciências Exatas e Naturais do Pontal, ICENP Universidade Federal de Uberlândia Rua Vinte, 1600, 38304‐402, Tupã Ituiutaba MG Brazil
- Instituto de Química Universidade Federal de Uberlândia Avenida João Naves de Avila, 2121, 38400‐902 Uberlândia MG Brazil
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Abstract
A variety of environmental toxicants such as heavy metals, pesticides, organic
chemicals, etc produce harmful effects in our living systems. In the literature, various reports have
indicated the detrimental effects of toxicants such as immunotoxicity, cardiotoxicity,
nephrotoxicity, etc. Experimental animals are generally used to investigate the safety profile of
environmental chemicals, but research on animals has some limitations. Thus, there is a need for
alternative approaches. Docking study is one of the alternate techniques which predict the binding
affinity of molecules in the active site of a particular receptor without using animals. These
techniques can also be used to check the interactions of environmental toxicants towards biological
targets. Varieties of user-friendly software are available in the market for molecular docking, but
very few toxicologists use these techniques in the field of toxicology. To increase the use of these
techniques in the field of toxicology, understanding of basic concepts of these techniques is
required among toxicological scientists. This article has summarized the fundamental concepts of
docking in the context of its role in toxicology. Furthermore, these promising techniques are also
discussed in this study.
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Affiliation(s)
- Meenakshi Gupta
- Department of Pharmacology, Indo-Soviet Friendship Pharmacy College (ISFCP), Moga, Punjab, India
| | - Ruchika Sharma
- Department of Biotechnology, Indo-Soviet Friendship College of Professional Studies (ISFCPS), Moga, Punjab, India
| | - Anoop Kumar
- Department of Pharmacology and Toxicology, National Institute of Pharmaceutical Education and Research (NIPER)-Raebareli, Lucknow (UP), India
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48
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Ghosh D, Karmakar P. Insight into anti-oxidative carbohydrate polymers from medicinal plants: Structure-activity relationships, mechanism of actions and interactions with bovine serum albumin. Int J Biol Macromol 2020; 166:1022-1034. [PMID: 33166557 DOI: 10.1016/j.ijbiomac.2020.10.258] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2020] [Revised: 10/29/2020] [Accepted: 10/30/2020] [Indexed: 01/06/2023]
Abstract
Recently, research associated with natural anti-oxidants leads to the chemical characterization of many compounds possessing strong anti-oxidant activity. Among these anti-oxidants, naturally occurring carbohydrate polymers containing pectic arabinogalactans esterified with phenolic acids in monomeric and dimeric forms are noteworthy. The presence of highly branched arabinogalactan type II side chains and sugar linked phenolic acid residues have been resolved as important parameters. The anti-oxidant activity of these compounds depend on their ability to convert free radicals into stable by-products and themselves oxidized to more stable and less reactive resonance stabilized radicals. Moreover, these carbohydrate polymers form water soluble stable complexes with protein. Such findings support their applications in a diversity of fields including food industry and pharmacy. This review highlights experimental evidences supporting that the carbohydrate polymers containing phenolic polysaccharides may become promising drug candidate for the prevention of aging and age related diseases.
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Affiliation(s)
- Debjani Ghosh
- Bhatar Girls' High School, Bhatar, Purba Bardhaman, West Bengal, India.
| | - Parnajyoti Karmakar
- Government General Degree College at Kalna-I, Medgachi, Muragacha, Purba Bardhaman, West Bengal, India
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Yong L, Huang M, Wei Y, Xu J, Yi Z. Investigating the interaction between three perfluorinated carboxylic acids and the G protein-coupled estrogen receptor: spectroscopic analyses and computational simulations. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2020; 12:3944-3953. [PMID: 32743632 DOI: 10.1039/d0ay01052a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
In this paper, perfluorinated compounds (PFCs), such as perfluorobutyric acid (PFBA), perfluorooctanoic acid (PFOA) and perfluorododecanoic acid (PFDoA), were selected as typical representatives of perfluorinated carboxylic acids (PFCAs) to study the effects of PFCAs on the G protein-coupled estrogen receptor (GPER). The interaction mechanism of the three types of PFCAs with the GPER was investigated using steady-state fluorescence spectroscopy, ultraviolet-visible spectroscopy, three-dimensional fluorescence spectroscopy, and Fourier transform infrared spectroscopy combined with molecular docking and molecular dynamics simulations. Among these techniques, steady-state fluorescence and ultraviolet-visible spectroscopic analyses showed that PFBA, PFOA and PFDoA quenched the endogenous GPER fluorescence by combined dynamic and static quenching and non-radiative energy transfer. The binding constants (Ka) of PFCAs on the GPER were all larger than 105 L mol-1, indicating that their affinity for the GPER was strong. Fourier transform infrared spectroscopy and three-dimensional fluorescence showed that the secondary structure of the GPER changed after binding to PFCAs. Thermodynamic analysis showed ΔG < 0, which indicated that the interaction between the GPER and PFCAs was spontaneous. For the binding of PFBA and PFOA to the GPER, ΔH > 0 and ΔS > 0, indicating that the interaction was mainly driven by hydrophobic forces; for the binding of PFDoA to the GPER, ΔH < 0 and ΔS < 0, suggesting that van der Waals force and hydrogen bonding were the main interaction forces. Molecular dynamics simulations suggested that the stability of the GPER-PFCA complexes was higher than that of the free GPER, and also that the structure and hydrophobicity of the GPER changed after binding to PFCAs. Molecular docking analysis showed that all three PFCAs could form hydrogen bonds with the GPER, which improved the stability of the complex.
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Affiliation(s)
- Li Yong
- Guangxi Colleges and Universities Key Laboratory of Food Safety and Detection, College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, China.
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Singh I, Luxami V, Paul K. Spectroscopy and molecular docking approach for investigation on the binding of nocodazole to human serum albumin. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2020; 235:118289. [PMID: 32222625 DOI: 10.1016/j.saa.2020.118289] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2019] [Revised: 03/16/2020] [Accepted: 03/20/2020] [Indexed: 06/10/2023]
Abstract
The interaction between nocodazole (Nz) and human serum albumin (HSA) under controlled physiological condition (pH 7.4) is examined using absorption, emission, fluorescence lifetime (FLT) and circular dichroism (CD) spectroscopic techniques. The binding constant (order of 105 M-1) from UV-vis and fluorescence spectroscopy reveals a strong interaction between Nz and HSA. Fluorescence quenching study shows that Nz binds with HSA through static quenching process. It is induced by formation of Nz-HSA complex because the Stern-Volmer quenching constant is inversely correlated with the temperature which is further verified by time-resolved fluorescence spectroscopy. The thermodynamic parameters at different temperatures indicate that the binding process is spontaneous where hydrogen bonding interactions and Van der Waals forces play major roles during the interaction between Nz and HSA. By means of spectroscopy and molecular modeling, we have discovered and interpreted the alteration of the secondary structure of HSA by Nz complexation. Synchronous, three-dimensional fluorescence and CD spectroscopic results reveal that the addition of Nz to HSA affects changes in the micro-environment and conformation of HSA. According to Förster Resonance Energy Transfer (FRET), the binding distance (r) between Nz and residue of HSA is <8 nm with excellent energy efficiency. The docking study suggests that nocodazole binds at Domain IIA in the hydrophobic pocket of human serum albumin.
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Affiliation(s)
- Iqubal Singh
- School of Chemistry and Biochemistry, Thapar Institute of Engineering and Technology, Patiala-147001, India
| | - Vijay Luxami
- School of Chemistry and Biochemistry, Thapar Institute of Engineering and Technology, Patiala-147001, India
| | - Kamaldeep Paul
- School of Chemistry and Biochemistry, Thapar Institute of Engineering and Technology, Patiala-147001, India.
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