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Dixit S, Ahsan H, Khan FH. Interaction of Synthetic Pyrethroid Insecticide Deltamethrin with Human
Alpha-2-Macroglobulin: Spectroscopic and Molecular Docking Studies. Protein Pept Lett 2022; 29:284-292. [DOI: 10.2174/0929866529666220203095706] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Revised: 11/17/2021] [Accepted: 12/07/2021] [Indexed: 11/22/2022]
Abstract
Background:
Deltamethrin (DLM) is a commercial insecticide of the synthetic
pyrethroid family that is used to control disease-causing insects and vectors. When humans are exposed
to the fumes or aerosols of DLM, it enters the body via cuticular absorption and reacts with
proteins and other biomolecules.
Objective:
Alpha-2-macroglobulin (α2M) is a serum proteinase inhibitor that also carries out receptor-
mediated endocytosis of extracellular substances. This study was done to decipher the structural
and functional alterations of α2M by DLM.
Method:
Various spectroscopic techniques, including UV absorption and fluorescence spectroscopy,
binding studies, and molecular docking, were used to characterize the interaction of DLM
with α2M. The affinity constant was calculated from the Stern-Volmer equation using fluorescence
data.
Results:
The UV-Vis and fluorescence spectral studies indicated the formation of a complex between
α2M and DLM. Thermodynamically, the interaction was found to be spontaneous with ΔG =
-4.23 kcal/mol. CD spectra suggested a change in the secondary structure of the protein from β to α
helical content with increasing concentration of DLM. The molecular docking study by Autodock
Vina established the interaction of DLM with Glu-926, Ala-1103, Ala-1108, Val-1116, Asn-1159,
Glu-1220, Leu-1261, Thr-1272, Ile-1390, Pro-1391, Lys-1393, Val-1396, Lys-1397, Thr-1408,
Glu-1409, Val-1410, Ser-1411, Ser-1412, and Asn-1413 with an improved docking score of -6.191
kcal/mol. The binding was carried out in the vicinity of the receptor-binding domain at the C-terminal
of α2M.
Conclusion:
The decrease in the functional activity and structural changes of protein after binding
with DLM has a significant effect on human α2M. The information may be useful for exploring the
role of DLM in a clinical chemistry laboratory.
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Affiliation(s)
- Swati Dixit
- Department of Biochemistry, Faculty of Life Sciences, Aligarh Muslim University, Aligarh 202002, India
| | - Haseeb Ahsan
- Faculty of Dentistry, Department of Biochemistry, Jamia Millia Islamia, New Delhi 110025, India
| | - Fahim Halim Khan
- Department of Biochemistry, Faculty of Life Sciences, Aligarh Muslim University, Aligarh 202002, India
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2
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Zargar S, Wani TA. Exploring the binding mechanism and adverse toxic effects of persistent organic pollutant (dicofol) to human serum albumin: A biophysical, biochemical and computational approach. Chem Biol Interact 2021; 350:109707. [PMID: 34656558 DOI: 10.1016/j.cbi.2021.109707] [Citation(s) in RCA: 43] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2021] [Revised: 10/01/2021] [Accepted: 10/13/2021] [Indexed: 02/07/2023]
Abstract
The organochlorine pesticide dicofol (DCF), a persistent organic pollutant, is used as acaricide worldwide. Considering its large consumption in the agriculture sector and potential toxic effects such as endocrine disruption, carcinogenicity, and environmental persistence are detrimental to human health. To take an extensive evaluation of its potential toxicity, the current study was aimed to explore the binding mechanism and adverse effect of DCF on human serum albumin (HSA) by using an array of biophysical techniques (UV-visible, fluorescence, 3D fluorescence, and circular dichroism spectroscopy), isothermal titration calorimetric (ITC), computational methods and biochemical approaches. Fluorescence quenching and UV-Visible spectra of the HSA-DCF system confirmed static quenching mechanism and complex formation between HSA and DCF. The thermodynamics results from ITC revealed DCF-HSA interaction was exothermic and spontaneous and involved hydrophobic interactions and hydrogen bonding. The esterase activity of HSA displayed constant Vmax and elevated Km values confirming DCF-HSA competitive interaction. Circular dichroism spectra results revealed structural changes in HSA protein on interaction with DCF. Furthermore, molecular-specific site marker and molecular modelling results affirmed that the binding Site of DCF is Site I of HSA. A significant carbonyl content level in DCF-HSA system suggested protein structure damage. This work is likely to add a better understanding of DCF toxicity in human health and helpful in fortifying the check on food safety.
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Affiliation(s)
- Seema Zargar
- Department of Biochemistry, College of Science, King Saud University, P.O. Box 22452, Riyadh, 11451, Saudi Arabia
| | - Tanveer A Wani
- Department of Pharmaceutical Chemistry, College of Pharmacy, King Saud University, P.O. Box 2457, Riyadh, 11451, Saudi Arabia.
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3
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Abd-Elhakim YM, El Sharkawy NI, El Bohy KM, Hassan MA, Gharib HSA, El-Metwally AE, Arisha AH, Imam TS. Iprodione and/or chlorpyrifos exposure induced testicular toxicity in adult rats by suppression of steroidogenic genes and SIRT1/TERT/PGC-1α pathway. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:56491-56506. [PMID: 34060014 DOI: 10.1007/s11356-021-14339-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2021] [Accepted: 05/04/2021] [Indexed: 06/12/2023]
Abstract
There is cumulative evidence that iprodione (IPR) fungicide and chlorpyrifos (CPF) insecticide are endocrine disruptors that can evoke reproductive toxicity. Yet, the underlying mechanisms are still unclear. Besides, the outcomes of their co-exposure to male sexual behavior and male fertility are still unknown. The effects of IPR (200 mg/kg b.wt) and CPF (7.45 mg/kg b.wt) single or mutual exposure for 65 days on sexual behavior, sex hormones, testicular enzymes, testis, and accessory sex gland histomorphometric measurements, apoptosis, and oxidative stress biomarkers were investigated. In addition, expression of nuclear receptor subfamily group A (NR5A1), 17β-hydroxysteroid dehydrogenase (HSD17B3), silent information regulator type-1 (SIRT1), telomerase reverse transcriptase (TERT), and peroxisome proliferator-activated receptor gamma coactivator 1-alpha (PGC-1α) genes has been assessed. Our results revealed that the individual or concurrent IPR and CPF exposure significantly disturb the sexual behavior, semen characteristics, testicular enzymes, and male hormones level. Oxidative stress caused by IPR and CPF activates apoptosis by inducing Caspase-3 and reducing Bcl-2. Downregulation of HSD17B3, NR5A1, and SIRT1/TERT/PGC-1α pathway was evident. Of note, most of these disturbances were exaggerated in rats co-exposed to IPR and CPF compared to IPR or CPF alone. Conclusively, our findings verified that IPR and CPF possibly damage the male reproductive system, and concurrent exposure should be avoided.
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Affiliation(s)
- Yasmina M Abd-Elhakim
- Department of Forensic Medicine and Toxicology, Faculty of Veterinary Medicine, Zagazig University, Zagazig, Egypt
| | - Nabela I El Sharkawy
- Department of Forensic Medicine and Toxicology, Faculty of Veterinary Medicine, Zagazig University, Zagazig, Egypt
| | - Khlood M El Bohy
- Department of Forensic Medicine and Toxicology, Faculty of Veterinary Medicine, Zagazig University, Zagazig, Egypt
| | - Mona A Hassan
- Department of Forensic Medicine and Toxicology, Faculty of Veterinary Medicine, Zagazig University, Zagazig, Egypt.
| | - Heba S A Gharib
- Department of Veterinary Public Health, Faculty of Veterinary Medicine, Zagazig University, Zagazig, Egypt
| | - Abeer E El-Metwally
- Department of Pathology, Animal Reproduction Research Institute, Giza, Egypt
| | - Ahmed Hamed Arisha
- Department of Animal Physiology and Biochemistry, Faculty of Veterinary Medicine, Badr University in Cairo (BUC), Badr City, Cairo, Egypt
- Department of Physiology, Faculty of Veterinary Medicine, Zagazig University, Sharkia, Zagazig, Egypt
| | - Tamer S Imam
- Department of Forensic Medicine and Toxicology, Faculty of Veterinary Medicine, Zagazig University, Zagazig, Egypt
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4
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Gleason ML, Zhang R, Batzer JC, Sun G. Stealth Pathogens: The Sooty Blotch and Flyspeck Fungal Complex. ANNUAL REVIEW OF PHYTOPATHOLOGY 2019; 57:135-164. [PMID: 31150591 DOI: 10.1146/annurev-phyto-082718-100237] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Sooty blotch and flyspeck (SBFS) fungi produce superficial, dark-colored colonies on fruits, stems, and leaves of many plant genera. These blemishes are economically damaging on fruit, primarily apple and pear, because they reduce the sale price of fresh fruit. Fungicide spray programs can control SBFS but are costly and impair human and environmental health; thus, less chemically intensive management strategies are needed. Although the scientific study of SBFS fungi began nearly 200 years ago, recent DNA-driven studies revealed an unexpectedly diverse complex: more than 100 species in 30 genera of Ascomycota and Basidiomycota. Analysis of evolutionary phylogenetics and phylogenomics indicates that the evolution of SBFS fungi from plant-penetrating ancestors to noninvasive ectophytic parasites was accompanied by a massive contraction of pathogenicity-related genes, including plant cell wall-degrading enzymes and effectors, and an expansion of cuticle-degradation genes. This article reviews progress in understanding SBFS taxonomy and ecology and improving disease management. We also highlight recent breakthroughs in reconstructing the evolutionary origins of these unusual plant pathogens and delineating adaptations to their ectophytic niche.
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Affiliation(s)
- Mark L Gleason
- State Key Laboratory of Crop Stress Biology in Arid Areas and College of Plant Protection, Northwest A&F University, Yangling 712100, Shaanxi Province, China;
- Department of Plant Pathology and Microbiology, Iowa State University, Ames, Iowa 50011, USA
| | - Rong Zhang
- State Key Laboratory of Crop Stress Biology in Arid Areas and College of Plant Protection, Northwest A&F University, Yangling 712100, Shaanxi Province, China;
| | - Jean C Batzer
- Department of Plant Pathology and Microbiology, Iowa State University, Ames, Iowa 50011, USA
| | - Guangyu Sun
- State Key Laboratory of Crop Stress Biology in Arid Areas and College of Plant Protection, Northwest A&F University, Yangling 712100, Shaanxi Province, China;
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5
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Ahmed A, Shamsi A, Khan MS, Husain FM, Bano B. Probing the interaction of human serum albumin with iprodione, a fungicide: spectroscopic and molecular docking insight. J Biomol Struct Dyn 2018; 37:857-862. [DOI: 10.1080/07391102.2018.1442252] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Azaj Ahmed
- Faculty of Life Science, Department of Biochemistry, Aligarh Muslim University, Aligarh, India
| | - Anas Shamsi
- Faculty of Life Science, Department of Biochemistry, Aligarh Muslim University, Aligarh, India
| | - Mohd Shahnawaz Khan
- Protein Research Chair, Department of Biochemistry, College of Sciences, King Saud University, Riyadh, Saudi Arabia
| | - Fohad Mabood Husain
- Faculty of Food and Agricultural Sciences, Department of Food Science and Nutrition, King Saud University, 2460, Riyadh 11451, Saudi Arabia
| | - Bilqees Bano
- Faculty of Life Science, Department of Biochemistry, Aligarh Muslim University, Aligarh, India
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6
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Ahmad A, Ahmad M. Understanding the fate of human serum albumin upon interaction with edifenphos: Biophysical and biochemical approaches. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2018; 145:46-55. [PMID: 29482731 DOI: 10.1016/j.pestbp.2018.01.006] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2017] [Revised: 01/09/2018] [Accepted: 01/17/2018] [Indexed: 06/08/2023]
Abstract
Edifenphos (EDF), an important organophosphate fungicide used in agriculture, is a great threat to human health and environment. To assess the toxicity of EDF at the level of protein molecule, the effect of EDF on human serum albumin (HSA) was investigated by biophysical and biochemical approaches. EDF-HSA complex is formed as a result of static quenching as revealed by the intrinsic fluorescence analysis. Thermodynamic analysis of the binding data suggests involvement of hydrophobic interactions in EDF-HSA complex formation, which is in line with molecular docking results. Moreover, thermodynamic parameters of binding between EDF and HSA suggest entropy-driven spontaneous interaction, presumably dominated by hydrophobic forces. Further, binding site of EDF seems to have been located within sub-domain IIA of HSA. EDF binding to HSA decreases its alpha helical content as analyzed by CD spectra. Marked micro-environmental changes around tryptophan/tyrosine residues in HSA upon EDF binding were recorded via three-dimensional fluorescence spectroscopy. Substantial release of protein carbonyl from HSA as a result of EDF treatment suggested involvement of ROS in EDF induced protein damage. This work is expected to provide some leads toward EDF induced toxicity in humans and would be helpful in reinforcing the check on food safety.
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Affiliation(s)
- Ajaz Ahmad
- Department of Biochemistry, Faculty of Life Sciences, Aligarh Muslim University, Aligarh 202002, India
| | - Masood Ahmad
- Department of Biochemistry, Faculty of Life Sciences, Aligarh Muslim University, Aligarh 202002, India.
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7
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Hadichegeni S, Goliaei B, Taghizadeh M, Davoodmanesh S, Taghavi F, Hashemi M. Characterization of the interaction between human serum albumin and diazinon via spectroscopic and molecular docking methods. Hum Exp Toxicol 2018; 37:959-971. [DOI: 10.1177/0960327117741752] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Human serum albumin (HSA) is a soluble blood protein which binds to small molecules (such as drugs and toxins) and transfers them within the blood circulation. In this research, the interaction of diazinon, as a toxic organophosphate, with HSA was investigated. Various biophysical methods such as fluorescence, ultraviolet–visible (UV-vis), Fourier transform infrared spectroscopy, and molecular docking were utilized to characterize the binding properties of diazinon to HSA under physiological-like condition. The UV-vis spectroscopy showed that the absorption increased and the fluorescence intensity of HSA decreased regularly with regard to the gradual increases of the concentrations of diazinon. Due to the binding constant of ( ka = 3.367 × 10+4 M−1), the α-helix structure for the first day and 35 days of incubation were obtained 66.09–55.4% and 59.99–46.48%, respectively, and their amounts in other secondary structures (β-sheet, β-anti, and random (r) coils) were increased. The molecular docking revealed a good binding site in HSA (Trp-214) for diazinon which was related to the considerable alterations in HSA secondary and tertiary structures. There is a close relationship between the secondary structure of protein and its biological activity and after 35 days of incubation, the high toxic concentrations of diazinon can make HSA to be partially unfolded and lose its structure.
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Affiliation(s)
- S Hadichegeni
- Department of Biophysics, Islamic Azad University, Science and Research Branch, Tehran, Iran
| | - B Goliaei
- Department of Biophysics, Institute of Biochemistry and Biophysics (IBB), University of Tehran, Tehran, Iran
| | - M Taghizadeh
- Department of Biophysics, Institute of Biochemistry and Biophysics (IBB), University of Tehran, Tehran, Iran
- Department of Cell and Molecular Biology, Faculty of Advance Science and Technology, Pharmaceutical Sciences Branch, Islamic Azad University (IAUPS), Tehran, Iran
| | - S Davoodmanesh
- Department of Biophysics, Islamic Azad University, Science and Research Branch, Tehran, Iran
| | - F Taghavi
- Department of Biophysics, Tarbiat Modares University, Tehran, Iran
| | - M Hashemi
- Department of Genetics, Islamic Azad University, Tehran Medical Branch, Tehran, Iran
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8
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Gao B, Chen T, Cui K. Constituting of a new surface-initiating system on polymeric microspheres and preparation of basic protein surface-imprinted material in aqueous solution. POLYM ADVAN TECHNOL 2018. [DOI: 10.1002/pat.4167] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Baojiao Gao
- Department of Chemical Engineering; North University of China; Taiyuan 030051 China
| | - Tao Chen
- Department of Chemical Engineering; North University of China; Taiyuan 030051 China
| | - Kunli Cui
- Department of Chemical Engineering; North University of China; Taiyuan 030051 China
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9
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Rosli H, Mayfield DA, Batzer JC, Dixon PM, Zhang W, Gleason ML. Evaluating the Performance of a Relative Humidity-Based Warning System for Sooty Blotch and Flyspeck in Iowa. PLANT DISEASE 2017; 101:1721-1728. [PMID: 30676929 DOI: 10.1094/pdis-02-17-0294-re] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
A warning system for the sooty blotch and flyspeck (SBFS) fungal disease complex of apple, developed originally for use in the southeastern United States, was modified to provide more reliable assessment of SBFS risk in Iowa. Modeling results based on previous research in Iowa and Wisconsin had suggested replacing leaf wetness duration with cumulative hours of relative humidity (RH) ≥97% as the weather input to the SBFS warning system. The purpose of the present study was to evaluate the performance of a RH-based SBFS warning system, and to assess the potential economic benefits for its use in Iowa. The warning system was evaluated in two separate sets of trials-trial 1 during 2010 and 2011, and trial 2 during 2013-2015-using action thresholds based on cumulative hours of RH ≥97% and ≥90%, respectively, in conjunction with two different fungicide regimes. The warning system was compared with a traditional calendar-based system that specified spraying at predetermined intervals of 10 to 14 days. In trial 1, use of the RH ≥97% threshold caused substantial differences between two RH sensors in recording number of hours exceeding the threshold. When both RH thresholds were compared for 2013-2015, on average, RH ≥90% resulted in a 53% reduction in variation of cumulative hours between two identical RH sensors placed adjacent to each other in an apple tree canopy. Although both the SBFS warning system and the calendar-based system resulted in equivalent control of SBFS, the warning system required fewer fungicide sprays than the calendar-based system, with an average of 3.8 sprays per season (min = 2; max = 5) vs. 6.4 sprays per season (min = 5; max = 8), respectively. The two fungicide regimes provided equivalent SBFS control when used in conjunction with the warning system. A partial budget analysis showed that using the SBFS warning system with a threshold of RH ≥90% was cost effective for orchard sizes of >1 ha. The revised warning system has potential to become a valuable decision support tool for Midwest apple growers because it reduces fungicide costs while protecting apples as effectively as a calendar-based spray schedule. The next step toward implementation of the SBFS warning system in the North Central U.S. should be multiyear field testing in commercial orchards throughout the region.
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Affiliation(s)
- Hafizi Rosli
- Department of Plant Pathology and Microbiology, Iowa State University, Ames, IA; and School of Biological Sciences, Universiti Sains Malaysia, Penang, Malaysia
| | - Derrick A Mayfield
- Department of Plant Pathology and Microbiology, Iowa State University, Ames, IA
| | - Jean C Batzer
- Department of Plant Pathology and Microbiology, Iowa State University, Ames, IA
| | - Philip M Dixon
- Department of Statistics, Iowa State University, Ames, IA
| | - Wendong Zhang
- Department of Economics, Iowa State University, Ames, IA
| | - Mark L Gleason
- Department of Plant Pathology and Microbiology, Iowa State University, Ames, IA
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10
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Wang J, Ma L, Zhang Y, Jiang T. Investigation of the interaction of deltamethrin (DM) with human serum albumin by multi-spectroscopic method. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2016.09.061] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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11
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Hassan MF, Rauf A. Synthesis and study on the binding of thiazol-2(3H)-ylidine derivative with human serum albumin using spectroscopic and molecular docking methods. LUMINESCENCE 2016; 32:602-611. [PMID: 27813306 DOI: 10.1002/bio.3227] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2016] [Revised: 08/25/2016] [Accepted: 09/06/2016] [Indexed: 12/25/2022]
Abstract
In this article, a facile and convenient synthesis of thiazol-2(3H)-ylidine derivatives of fatty acid (3a-c) is described. The binding of N'-(4,5-dimethyl-3-penylthiazol-2(3H)-ylidine)octadec-9-enehydrazide (3a) with human serum albumin (HSA) is explored using various spectral methods and molecular docking. Fluorescence quenching results show that 3a induces conformational changes in HSA and the polarity around the tryptophan residues is increased. Stern-Volmer quenching plots at different temperatures (298, 305 and 312 K) show that the fluorescence quenching mechanism is static quenching. Synchronous fluorescence, 3D fluorescence spectra, circular dichroism and Fourier transform infrared spectroscopy are used to determine the structural change in HSA on interaction with 3a. Förster resonance energy transfer analysis shows that the binding distance (r0 = 2.78 nm) between HSA (Trp214) and 3a is within the of range 2-8 nm for quenching to occur. The molecular docking study also confirms that 3a is located in subdomain IIA (site I) of HSA and is stabilized by hydrogen bonding and hydrophobic forces.
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Affiliation(s)
| | - Abdul Rauf
- Department of Chemistry, Aligarh Muslim University, Aligarh, India
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12
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Bhat SA, Bhat WF, Bano B. Spectroscopic evaluation of the interaction between pesticides and chickpea cystatin: comparative binding and toxicity analyses. ENVIRONMENTAL SCIENCE. PROCESSES & IMPACTS 2016; 18:872-81. [PMID: 27327564 DOI: 10.1039/c6em00195e] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The binding study of pesticides with proteins is of great importance in ecotoxicology. In this study, a comparative interaction mechanism of phytocystatin with three pesticides has been presented, each from a different class-glyphosate herbicide (GPS), chlorpyrifos insecticide (CPF), and mancozeb fungicide (MCZ). The interaction of purified chickpea cystatin (CPC) has been characterized by fluorescence, UV, and circular dichroism (CD) spectroscopic methods. The study revealed association constants (Ka) of 52 M(-1), 1.145 × 10(3) M(-1), and 36.12 M(-1) for the interaction of CPF, MCZ, and GPS with CPC, respectively, signifying the high affinity interaction for MCZ. Structural changes (at tertiary and secondary levels) were confirmed by UV-visible, intrinsic fluorescence and CD spectroscopy. The results showed that the effect on the CPC structure was more pronounced in the case of MCZ, which was followed by CPF and then GPS. The functional analysis of the pesticide treated inhibitor showed a decline in antipapain activity which varied with the time and dose as well as the class of pesticide. MCZ was relatively much more toxic as compared to CPF and GPS. Reactive oxygen species responsible for inhibitor damage were also analyzed. The results obtained implicate that the exposure of plants to pesticides may lead to physicochemical changes in proteins such as phytocystatins leading to physiological damage to the plant system.
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Affiliation(s)
- Sheraz Ahmad Bhat
- Department of Biochemistry, Faculty of Life Sciences, Aligarh Muslim University, Aligarh-202002, India.
| | - Waseem Feeroze Bhat
- Department of Biochemistry, Faculty of Life Sciences, Aligarh Muslim University, Aligarh-202002, India.
| | - Bilqees Bano
- Department of Biochemistry, Faculty of Life Sciences, Aligarh Muslim University, Aligarh-202002, India.
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13
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Chayata H, Lassalle Y, Nicol É, Manolikakes S, Souissi Y, Bourcier S, Gosmini C, Bouchonnet S. Characterization of the ultraviolet-visible photoproducts of thiophanate-methyl using high performance liquid chromatography coupled with high resolution tandem mass spectrometry-Detection in grapes and tomatoes. J Chromatogr A 2016; 1441:75-82. [PMID: 26961913 DOI: 10.1016/j.chroma.2016.02.078] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2016] [Revised: 02/25/2016] [Accepted: 02/26/2016] [Indexed: 01/25/2023]
Abstract
UV-visible irradiation of thiophanate-methyl (TM) led to the formation of nine photoproducts that were characterized by high performance liquid chromatography coupled with high resolution Fourier transform ion cyclotron resonance mass spectrometry (FTICR-MS). Although carbendazime has been reported in the literature to be the major metabolite and photoproduct of thiophanate-methyl, it was not detected in this study. However, an isomer of carbendazime referred as PP2, which was unambiguously characterized owing to CID experiments, was found in great abundance. Grape berries and cherry tomatoes treated with aqueous solutions of thiophanate-methyl were submitted to irradiation under laboratory conditions. TM and PP2 were detected in both peel and flesh of berries. The ability of TM and PP2 to pass through the fruit skin has been shown to be highly compound and matrix dependent. In vitro bioassays on Vibrio fischeri bacteria showed that the global ecotoxicity of the TM solution increases significantly with the irradiation time. PP2 should likely contribute to this ecotoxicity enhancement since in silico estimations for Daphnia magna provide a LC50 value seven times lower for PP2 than for the parent molecule.
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Affiliation(s)
- Houda Chayata
- LCM, CNRS, École Polytechnique, Université Paris-Saclay, 91128 Palaiseau, France
| | - Yannick Lassalle
- LCM, CNRS, École Polytechnique, Université Paris-Saclay, 91128 Palaiseau, France
| | - Édith Nicol
- LCM, CNRS, École Polytechnique, Université Paris-Saclay, 91128 Palaiseau, France
| | - Sophia Manolikakes
- LCM, CNRS, École Polytechnique, Université Paris-Saclay, 91128 Palaiseau, France
| | - Yasmine Souissi
- LCM, CNRS, École Polytechnique, Université Paris-Saclay, 91128 Palaiseau, France
| | - Sophie Bourcier
- LCM, CNRS, École Polytechnique, Université Paris-Saclay, 91128 Palaiseau, France
| | - Corinne Gosmini
- LCM, CNRS, École Polytechnique, Université Paris-Saclay, 91128 Palaiseau, France
| | - Stéphane Bouchonnet
- LCM, CNRS, École Polytechnique, Université Paris-Saclay, 91128 Palaiseau, France.
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14
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Yeggoni DP, Subramanyam R. Binding studies of L-3,4-dihydroxyphenylalanine with human serum albumin. MOLECULAR BIOSYSTEMS 2014; 10:3101-10. [PMID: 25209359 DOI: 10.1039/c4mb00408f] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
L-Dopa has been used to increase dopamine concentrations in the treatment of Parkinson's disease and dopamine-responsive dystonia. The binding interaction between L-dopa (phytochemical) and human serum albumin (HSA) under simulated physiological conditions was investigated by spectroscopic and molecular modeling methods. The results revealed that L-dopa caused fluorescence emission quenching of HSA through a static quenching procedure and the binding constant obtained was 2.3 ± 0.01 × 10(4) M(-1), which is corresponding to -5.9 kcal M(-1) of free energy at 25 °C. Interestingly, L-dopa is not binding to the α-1-acidglycoprotein, which is also a plasma protein and an acute phase protein. Furthermore, circular dichroism results confirm that in the presence of L-dopa the secondary structure of HSA is altered due to partial unfolding of the protein. Importantly, the displacement experiment with site specific probes, phenylbutazone (site I) and ibuprofen (site II), depicts that L-dopa binds particularly to site II of HSA. In addition, the molecular modeling results also confirmed that L-dopa is binding to the subdomain IIIA of HSA and is stabilized by hydrogen bonds and hydrophilic forces. Additionally, the molecular dynamic simulation studies showed that the HSA-L-dopa complex reaches an equilibration state at around 2 ns, which indicates that the HSA-L-dopa complex is very stable. These results provided valuable information of pharmacological mechanisms of L-dopa under in vivo conditions and play a pivotal role in the development of L-dopa-inspired drugs.
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Affiliation(s)
- Daniel Pushparaju Yeggoni
- Department of Plant Sciences, School of Life Sciences, University of Hyderabad, Hyderabad 500046, India.
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15
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Tunç S, Duman O, Soylu I, Kancı Bozoğlan B. Study on the bindings of dichlorprop and diquat dibromide herbicides to human serum albumin by spectroscopic methods. JOURNAL OF HAZARDOUS MATERIALS 2014; 273:36-43. [PMID: 24709480 DOI: 10.1016/j.jhazmat.2014.03.022] [Citation(s) in RCA: 82] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2013] [Revised: 03/10/2014] [Accepted: 03/11/2014] [Indexed: 06/03/2023]
Abstract
The interactions of dichlorprop (DCP) and diquat dibromide (DQ) herbicides with human serum albumin (HSA) protein were studied by UV absorption, fluorescence, synchronous fluorescence and circular dichroism (CD) spectroscopy. Both DCP and DQ quenched the fluorescence emission spectrum of HSA through the static quenching mechanism. The Stern-Volmer quenching constant, binding constant, the number of binding sites and thermodynamic parameters were determined at 288K, 298K, 310K and 318K. In HSA-DCP and HSA-DQ systems, an increase in temperature led to a decrease in the Stern-Volmer quenching constant and binding constant. One binding site was obtained for DCP and DQ on HSA. It was found that DCP can bind to HSA with higher affinity than DQ. Negative ΔH and positive ΔS values were obtained for the binding processes between protein and herbicide molecules. This result displayed that electrostatic interactions play a major role in the formation of HSA-DCP and HSA-DQ complexes. The binding processes were exothermic reactions and spontaneous. In addition, synchronous fluorescence and CD spectra of HSA revealed that the binding of DCP to HSA did not cause a significant conformational change in protein, but the interaction of DQ with HSA led to an alteration in the protein structure.
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Affiliation(s)
- Sibel Tunç
- Akdeniz University, Faculty of Science, Department of Chemistry, 07058 Antalya, Turkey.
| | - Osman Duman
- Akdeniz University, Faculty of Science, Department of Chemistry, 07058 Antalya, Turkey.
| | - Inanç Soylu
- Akdeniz University, Faculty of Science, Department of Chemistry, 07058 Antalya, Turkey
| | - Bahar Kancı Bozoğlan
- Akdeniz University, Faculty of Science, Department of Chemistry, 07058 Antalya, Turkey
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16
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Wang Y, Zhang G, Wang L. Interaction of prometryn to human serum albumin: insights from spectroscopic and molecular docking studies. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2014; 108:66-73. [PMID: 24485317 DOI: 10.1016/j.pestbp.2013.12.006] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2013] [Revised: 12/30/2013] [Accepted: 12/30/2013] [Indexed: 06/03/2023]
Abstract
Prometryn possesses much potential hazard to environment because of its chemical stability and biological toxicity. Here, the binding properties of prometryn with human serum albumin (HSA) and the protein structural changes were determined under simulative physiological conditions (pH 7.4) by multispectroscopic methods including fluorescence, UV-vis absorption, Fourier transform infrared (FT-IR) and circular dichroism (CD) spectroscopy, coupled with molecular modeling technique. The result of fluorescence titration suggested that the fluorescence quenching of HSA by prometryn was considered as a static quenching procedure. The negative enthalpy change (ΔH(○)) and positive entropy change (ΔS(○)) values indicated that the binding process was governed mainly by hydrophobic interactions and hydrogen bonds. The site marker displacement experiments suggested the location of prometryn binding to HSA was Sudlow's site I in subdomain IIA. Furthermore, molecular docking studies revealed prometryn can bind in the large hydrophobic activity of subdomain IIA. Analysis of UV-vis absorption, synchronous fluorescence, CD and FT-IR spectra demonstrated that the addition of prometryn resulted in rearrangement and conformational alteration of HSA with reduction in α-helix and increases in β-sheet, β-turn and random coil structures. This work provided reasonable model helping us further understand the transportation, distribution and toxicity effect of prometryn when it spreads into human blood serum.
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Affiliation(s)
- Yaping Wang
- State Key Laboratory of Food Science and Technology, Nanchang University, 235 Nanjing East Road, Nanchang 330047, China
| | - Guowen Zhang
- State Key Laboratory of Food Science and Technology, Nanchang University, 235 Nanjing East Road, Nanchang 330047, China.
| | - Langhong Wang
- State Key Laboratory of Food Science and Technology, Nanchang University, 235 Nanjing East Road, Nanchang 330047, China
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17
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Binding of serum albumins with bioactive substances – Nanoparticles to drugs. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C-PHOTOCHEMISTRY REVIEWS 2013. [DOI: 10.1016/j.jphotochemrev.2012.09.001] [Citation(s) in RCA: 160] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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18
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Han XL, Tian FF, Ge YS, Jiang FL, Lai L, Li DW, Yu QL, Wang J, Lin C, Liu Y. Spectroscopic, structural and thermodynamic properties of chlorpyrifos bound to serum albumin: A comparative study between BSA and HSA. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2012; 109:1-11. [DOI: 10.1016/j.jphotobiol.2011.12.010] [Citation(s) in RCA: 147] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2011] [Revised: 12/12/2011] [Accepted: 12/13/2011] [Indexed: 11/24/2022]
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19
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Interaction studies of aristolochic acid I with human serum albumin and the binding site of aristolochic acid I in subdomain IIA. Int J Biol Macromol 2011; 49:343-50. [DOI: 10.1016/j.ijbiomac.2011.05.010] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2011] [Revised: 05/12/2011] [Accepted: 05/16/2011] [Indexed: 02/06/2023]
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20
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Wu X, Liu J, Wang Q, Xue W, Yao X, Zhang Y, Jin J. Spectroscopic and molecular modeling evidence of clozapine binding to human serum albumin at subdomain IIA. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2011; 79:1202-1209. [PMID: 21640635 DOI: 10.1016/j.saa.2011.04.043] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2011] [Revised: 03/25/2011] [Accepted: 04/15/2011] [Indexed: 05/30/2023]
Abstract
Various spectroscopy and molecular docking methods were used to examine the binding of Clozapine (CLZ) to human serum albumin (HSA) in this paper. By monitoring the intrinsic fluorescence of single Trp214 residue and performing Dansylamide (DNSA) displacement measurement, the specific binding of CLZ in the vicinity of Sudlow's Site I of HSA has been clarified. An apparent distance of 27.3 Å between the Trp214 and CLZ was obtained via fluorescence resonance energy transfer (FRET) method. In addition, the changes in the secondary structure of HSA after its complexation with CLZ ligand were studied with CD spectroscopy, which indicate that CLZ does not has remarkable effect on the structure of the protein. Moreover, thermal denaturation experiment shows that the HSA-CLZ complexes are conformationally more stable. Finally, the binding details between CLZ and HSA were further confirmed by molecular docking studies, which revealed that CLZ was bound at subdomain IIA through multiple interactions, such as hydrophobic effect, van der Waals forces and hydrogen bonding.
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Affiliation(s)
- Xinhu Wu
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou, Gansu 730000, People's Republic of China.
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21
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Yahia IS, Al-Khedhairy AA, Musarrat J, Yakuphanoglu F. Optical spectroscopy studies of the interaction between thiophanate methyl and human serum albumin for biosensor applications. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2011; 79:1285-1290. [PMID: 21703921 DOI: 10.1016/j.saa.2011.04.056] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2010] [Revised: 04/14/2011] [Accepted: 04/27/2011] [Indexed: 05/31/2023]
Abstract
Optical properties of the interaction between thiophanate methyl and human serum albumin have been investigated for biosensor applications. The interaction between human serum albumin (HSA) and thiophanate methyl (MT) was investigated by UV-Vis absorption spectra and atomic force microscopy. The optical constants (refractive index, absorption index, band gap and dielectric properties) of HSA, MT and MT+HSA films were determined using absorbance, transmittance and reflectance spectra. The refractive index dispersion curve (>530 nm) exhibits the normal dispersion. The refractive index of the MT+HSA is higher than both HSA and MT alone due to the highest reflectance of the mixture of MT and HSA. This behavior is indicative of the complex formation between the MT and HSA.
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Affiliation(s)
- I S Yahia
- Department of Physics, Faculty of Education, Ain Shams University, Roxy, Cairo, Egypt
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22
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Saquib Q, Al-Khedhairy AA, Siddiqui MA, Roy AS, Dasgupta S, Musarrat J. Preferential binding of insecticide phorate with sub-domain IIA of human serum albumin induces protein damage and its toxicological significance. Food Chem Toxicol 2011; 49:1787-95. [DOI: 10.1016/j.fct.2011.04.028] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2011] [Revised: 03/19/2011] [Accepted: 04/15/2011] [Indexed: 11/30/2022]
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23
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Capriglione T, De Iorio S, Gay F, Capaldo A, Vaccaro MC, Morescalchi MA, Laforgia V. Genotoxic effects of the fungicide thiophanate-methyl on Podarcis sicula assessed by micronucleus test, comet assay and chromosome analysis. ECOTOXICOLOGY (LONDON, ENGLAND) 2011; 20:885-891. [PMID: 21461776 DOI: 10.1007/s10646-011-0655-8] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 03/15/2011] [Indexed: 05/27/2023]
Abstract
The increasing use of pesticides in modern agriculture has raised the need to evaluate their potential threat to animal and human health. In the present study, the genotoxic effects of environmentally relevant exposure to the fungicide thiophanate-methyl (TM) were assessed in the lizard Podarcis sicula (Reptilia, Lacertidae) using micronucleus test, chromosome aberration analysis and single-cell gel electrophoresis (comet) assay. The number of micronuclei increased significantly with exposure time in lizard specimens exposed to 1.5% TM for 30-40 days. In situ hybridization with the specific HindIII centromeric satellite was positive in 18.7% of the micronuclei observed, suggesting an aneugenic effect of TM during mitosis. DNA damage, evaluated by the comet assay, documented a significant gain in comet length in relation to exposure time that was paralleled by a reduction in head size. Finally, cytogenetic analysis showed a significant increase in chromosome aberrations in exposed animals compared with controls. Our data suggest that long-term TM exposure induces a genomic damage that is positively correlated to exposure time. If such genotoxic effects arise so clearly in an ectothermal vertebrate, such as P. sicula, prolonged exposure TM must be considered as a cytogenetic hazard.
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Affiliation(s)
- T Capriglione
- Department of Biological Sciences, Faculty of Sciences, University of Naples Federico II, Via Mezzocannone 8, 80134, Naples, Italy.
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24
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Influence of the albumin concentration and temperature on the lysis of human erythrocytes by sodium dodecyl sulfate. J Bioenerg Biomembr 2010; 42:413-8. [DOI: 10.1007/s10863-010-9310-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2010] [Accepted: 09/10/2010] [Indexed: 10/19/2022]
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25
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Saquib Q, Al-Khedhairy AA, Alarifi SA, Dwivedi S, Mustafa J, Musarrat J. Fungicide methyl thiophanate binding at sub-domain IIA of human serum albumin triggers conformational change and protein damage. Int J Biol Macromol 2010; 47:60-7. [DOI: 10.1016/j.ijbiomac.2010.03.020] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2010] [Revised: 03/06/2010] [Accepted: 03/26/2010] [Indexed: 10/19/2022]
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26
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Investigation of the Interaction Between Ofloxacin and Bovine Serum Albumin: Spectroscopic Approach. J SOLUTION CHEM 2010. [DOI: 10.1007/s10953-010-9527-8] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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27
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Li YS, Ge YS, Zhang Y, Zhang AQ, Sun SF, Jiang FL, Liu Y. Interaction of coomassie brilliant blue G250 with human serum albumin: Probing of the binding mechanism and binding site by spectroscopic and molecular modeling methods. J Mol Struct 2010. [DOI: 10.1016/j.molstruc.2010.01.015] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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28
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Wang YQ, Chen TT, Zhang HM. Investigation of the interactions of lysozyme and trypsin with biphenol A using spectroscopic methods. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2010; 75:1130-1137. [PMID: 20093070 DOI: 10.1016/j.saa.2009.12.071] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2009] [Revised: 12/19/2009] [Accepted: 12/31/2009] [Indexed: 05/28/2023]
Abstract
The interaction between bisphenol A (BPA) and lysozyme (or trypsin) was investigated by UV-vis absorption, fluorescence, synchronous fluorescence, and three-dimensional fluorescence spectra techniques under physiological pH 7.40. BPA effectively quenched the intrinsic fluorescence of lysozyme and trypsin via static quenching. H-bonds and van der Waals interactions played a major role in stabilizing the BPA-proteinase complex. The distance r between donor and acceptor was obtained to be 1.65 and 2.26 nm for BPA-lysozyme and BPA-trypsin complexes, respectively. The effect of BPA on the conformation of lysozyme and trypsin was analyzed using synchronous fluorescence and three-dimensional fluorescence spectra.
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Affiliation(s)
- Yan-Qing Wang
- Jiangsu Provincial Key Laboratory of Coastal Wetland Bioresources and Environmental Protection, Yancheng City, Jiangsu Province, People's Republic of China.
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29
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Neelam S, Gokara M, Sudhamalla B, Amooru DG, Subramanyam R. Interaction Studies of Coumaroyltyramine with Human Serum Albumin and Its Biological Importance. J Phys Chem B 2010; 114:3005-12. [DOI: 10.1021/jp910156k] [Citation(s) in RCA: 129] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Satyabala Neelam
- Department of Biochemistry, School of Life Sciences, University of Hyderabad, Hyderabad, Andhrapradesh 500046, India, and Department of Chemistry, Yogi Vemana University, Kadapa, Andhrapradesh 516003, India
| | - Mahesh Gokara
- Department of Biochemistry, School of Life Sciences, University of Hyderabad, Hyderabad, Andhrapradesh 500046, India, and Department of Chemistry, Yogi Vemana University, Kadapa, Andhrapradesh 516003, India
| | - Babu Sudhamalla
- Department of Biochemistry, School of Life Sciences, University of Hyderabad, Hyderabad, Andhrapradesh 500046, India, and Department of Chemistry, Yogi Vemana University, Kadapa, Andhrapradesh 516003, India
| | - Damu G. Amooru
- Department of Biochemistry, School of Life Sciences, University of Hyderabad, Hyderabad, Andhrapradesh 500046, India, and Department of Chemistry, Yogi Vemana University, Kadapa, Andhrapradesh 516003, India
| | - Rajagopal Subramanyam
- Department of Biochemistry, School of Life Sciences, University of Hyderabad, Hyderabad, Andhrapradesh 500046, India, and Department of Chemistry, Yogi Vemana University, Kadapa, Andhrapradesh 516003, India
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30
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Ujfalusi Z, Barkó S, Hild G, Nyitrai M. The effects of formins on the conformation of subdomain 1 in actin filaments. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY. B, BIOLOGY 2010; 98:7-11. [PMID: 19914084 PMCID: PMC2865993 DOI: 10.1016/j.jphotobiol.2009.10.001] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2009] [Revised: 10/08/2009] [Accepted: 10/09/2009] [Indexed: 12/29/2022]
Abstract
In this study we investigated the effects of formins on the conformation of actin filaments by using the method of fluorescence quenching. Actin was labelled with IAEDANS at Cys(374) and the quencher was acrylamide. The results showed that formin binding induced structural changes in the subdomain 1 of actin protomers which were reflected by greater quenching constants (K(SV)). Simultaneously the fraction of the fluorophore population accessible for the quencher (alpha) decreased. These observations suggest that the conformational distribution characteristic for the actin protomers became broader after the binding of formins, for which the structural framework was provided by a more flexible protein matrix in the microenvironment of the label. The effects of formins depended on the formin:actin molar ratio, and also on the ionic strength of the medium. These observations are in agreement with previous results and underline the importance of the intramolecular conformational changes induced by formins in the structure of actin filaments.
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Affiliation(s)
- Zoltán Ujfalusi
- University of Pécs, Faculty of Medicine, Department of Biophysics, Pécs, Szigeti str. 12, H-7624, Hungary
| | - Szilvia Barkó
- University of Pécs, Faculty of Medicine, Department of Biophysics, Pécs, Szigeti str. 12, H-7624, Hungary
| | - Gábor Hild
- University of Pécs, Faculty of Medicine, Department of Biophysics, Pécs, Szigeti str. 12, H-7624, Hungary
| | - Miklós Nyitrai
- University of Pécs, Faculty of Medicine, Department of Biophysics, Pécs, Szigeti str. 12, H-7624, Hungary
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31
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Katrahalli U, Jaldappagari S, Kalanur SS. Probing the binding of fluoxetine hydrochloride to human serum albumin by multispectroscopic techniques. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2010; 75:314-319. [PMID: 19932052 DOI: 10.1016/j.saa.2009.10.031] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2009] [Revised: 10/06/2009] [Accepted: 10/21/2009] [Indexed: 05/28/2023]
Abstract
The interaction between human serum albumin (HSA) and fluoxetine hydrochloride (FLX) have been studied by using different spectroscopic techniques viz., fluorescence, UV-vis absorption, circular dichroism and FTIR under simulated physiological conditions. Fluorescence results revealed the presence of static type of quenching mechanism in the binding of FLX to HSA. The values of binding constant, K of FLX-HSA were evaluated at 289, 300 and 310 K and were found to be 1.90x10(3), 1.68x10(3) and 1.45x10(3) M(-1), respectively. The number of binding sites, n was noticed to be almost equal to unity thereby indicating the presence of a single class of binding site for FLX on HSA. Based on the thermodynamic parameters, DeltaH(0) and DeltaS(0) nature of binding forces operating between HSA and FLX were proposed. Spectral results revealed the conformational changes in protein upon interaction. Displacement studies indicated the site I as the main binding site for FLX on HSA. The effect of common ions on the binding of FLX to HSA was also investigated.
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Affiliation(s)
- Umesha Katrahalli
- Department of Chemistry, Karnatak University, Pavate Nagar, Dharwad, Karnataka, India
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32
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Huang YB, Wang SJ, Zi YQ, Yu Z, Gao XY, Tang YC, Zhang DM. Investigation on the Interaction of Prulifloxacin with Human Serum Albumin: A Spectroscopic Analysis. Chem Pharm Bull (Tokyo) 2010; 58:582-6. [DOI: 10.1248/cpb.58.582] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Ya-Bei Huang
- Department of Chemistry, Huaibei Coal Normal College
- Huaibei Occupational Disease Prevention and Cure Hospital
| | - Shi-Jun Wang
- Huaibei Occupational Disease Prevention and Cure Hospital
| | - Yan-Qin Zi
- Department of Chemistry, Huaibei Coal Normal College
| | - Zhang Yu
- Department of Chemistry, Huaibei Coal Normal College
| | - Xiao-Yan Gao
- Department of Chemistry, Huaibei Coal Normal College
| | - Ying-Cai Tang
- Department of Chemistry, Huaibei Coal Normal College
| | - Da-Ming Zhang
- Department of Chemistry, Huaibei Coal Normal College
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