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Shamsi A, Shahwan M, Furkan M, Yadav DK, Khan RH. Computational and spectroscopic insight into the binding of citral with human transferrin: Targeting neurodegenerative diseases. Heliyon 2024; 10:e32755. [PMID: 39027624 PMCID: PMC467046 DOI: 10.1016/j.heliyon.2024.e32755] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2024] [Revised: 05/16/2024] [Accepted: 06/07/2024] [Indexed: 07/20/2024] Open
Abstract
The involvement of neuroinflammation in the pathogenesis of neurodegenerative disorders (NDs) is very significant. Currently, only symptomatic treatments exist, and there are no drugs that modify the progression of Alzheimer's disease (AD) or other NDs. Consequently, there is increasing attention on addressing AD-related neuroinflammation using anti-inflammatory compounds and antioxidants. Currently, there is a growing exploration of dietary phytochemicals as potential therapeutic agents for treating inflammation. Citral, a monoterpene, is under increasing investigation due to its neuroprotective effects. The dysregulation of iron homeostasis is a crucial factor in supporting neuroinflammation, underscoring the significance of proper iron balance. Human transferrin (htf) is a major player involved in iron homeostasis. In this study, we examined binding and dynamics of htf-citral complex through diverse experimental methods. Molecular docking studies revealed that citral binds to crucial residues of htf, forming a stable complex. UV-visible spectroscopy demonstrated binding of citral with htf with good affinity, evident from binding constant of 1.48 × 105 M-1. Further, fluorescence spectroscopy entrenched a stable htf-citral complex formation; citral demonstrates an excellent binding affinity to htf with a binding constant of 106 M-1. Moreover, fluorescence binding assay at various temperatures deciphered htf-citral complex to be driven by both static and dynamic quenching. The analysis of enthalpy change (ΔH) and entropy change (ΔS) demonstrated that htf-citral complex formation was driven mainly by hydrophobic interactions.The current work gives a platform to develop innovative therapeutic strategies targeting neuroinflammation through citral, particularly iron homeostasis.
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Affiliation(s)
- Anas Shamsi
- Centre of Medical and Bio-allied Health Sciences Research, Ajman University, United Arab Emirates
| | - Moyad Shahwan
- College of Pharmacy and Health Sciences, Ajman University, United Arab Emirates
| | - Mohammad Furkan
- Department of Biochemistry, Aligarh Muslim University, Aligarh, India
| | - Dharmendra Kumar Yadav
- Gachon Institute of Pharmaceutical Science and Department of Pharmacy, College of Pharmacy, Gachon University, Incheon, Republic of Korea
| | - Rizwan Hasan Khan
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, India
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2
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Capo A, Pennacchio A, Montagnese C, Hadjiantonis A, Demosthenous P, Giusti A, Staiano M, D'Auria S, Varriale A. A Förster Resonance Energy Transfer (FRET)-Based Immune Assay for the Detection of Microcystin-LR in Drinking Water. SENSORS (BASEL, SWITZERLAND) 2024; 24:3204. [PMID: 38794058 DOI: 10.3390/s24103204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2024] [Revised: 05/09/2024] [Accepted: 05/16/2024] [Indexed: 05/26/2024]
Abstract
Cyanobacteria bloom is the term used to describe an abnormal and rapid growth of cyanobacteria in aquatic ecosystems such as lakes, rivers, and oceans as a consequence of anthropic factors, ecosystem degradation, or climate change. Cyanobacteria belonging to the genera Microcystis, Anabaena, Planktothrix, and Nostoc produce and release toxins called microcystins (MCs) into the water. MCs can have severe effects on human and animal health following their ingestion and inhalation. The MC structure is composed of a constant region (composed of five amino acid residues) and a variable region (composed of two amino acid residues). When the MC variable region is composed of arginine and leucine, it is named MC-LR. The most-common methods used to detect the presence of MC-LR in water are chromatographic-based methods (HPLC, LC/MS, GC/MS) and immunological-based methods (ELISA). In this work, we developed a new competitive Förster resonance energy transfer (FRET) assay to detect the presence of traces of MC-LR in water. Monoclonal antibody anti-MC-LR and MC-LR conjugated with bovine serum albumin (BSA) were labeled with the near-infrared fluorophores CF568 and CF647, respectively. Steady-state fluorescence measurements were performed to investigate the energy transfer process between anti-MC-LR 568 and MC-LR BSA 647 upon their interaction. Since the presence of unlabeled MC-LR competes with the labeled one, a lower efficiency of FRET process can be observed in the presence of an increasing amount of unlabeled MC-LR. The limit of detection (LoD) of the FRET assay is found to be 0.245 nM (0.245 µg/L). This value is lower than the provisional limit established by the World Health Organization (WHO) for quantifying the presence of MC-LR in drinking water.
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Affiliation(s)
- Alessandro Capo
- Istituto di Scienze dell'Alimentazione, CNR, URT-Napoli, 80100 Napoli, Italy
| | | | | | - Antonis Hadjiantonis
- CY.R.I.C Cyprus Research and Innovation Center Ltd., Egomi, 2414 Nicosia, Cyprus
| | | | - Alessandro Giusti
- CY.R.I.C Cyprus Research and Innovation Center Ltd., Egomi, 2414 Nicosia, Cyprus
| | - Maria Staiano
- Istituto di Scienze dell'Alimentazione, CNR, 83100 Avellino, Italy
| | - Sabato D'Auria
- Dipartimento di Scienze Bio-Agroalimentari, CNR, 00185 Roma, Italy
| | - Antonio Varriale
- Istituto di Scienze dell'Alimentazione, CNR, URT-Napoli, 80100 Napoli, Italy
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A “traffic jam” of (+)-catechin caused by hyperglycemia — The interaction between (+)-catechin and human serum albumin (HSA) in high glucose environment. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.118975] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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4
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Wani TA, Bakheit AH, Al-Majed AA, Altwaijry N, Baquaysh A, Aljuraisy A, Zargar S. Binding and drug displacement study of colchicine and bovine serum albumin in presence of azithromycin using multispectroscopic techniques and molecular dynamic simulation. J Mol Liq 2021; 333:115934. [PMID: 33753950 PMCID: PMC7969832 DOI: 10.1016/j.molliq.2021.115934] [Citation(s) in RCA: 44] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2021] [Revised: 03/11/2021] [Accepted: 03/14/2021] [Indexed: 12/22/2022]
Abstract
The binding and displacement interaction of colchicine and azithromycin to the model transport protein bovine serum albumin (BSA) was evaluated in this study. Azithromycin, a macrolide antibiotic, has antiviral properties and hence, has been used concomitantly with hydroxychloroquine against SARS-CoV-2. Colchicine, a natural plant product is used to treat and prevent acute gout flares. Some macrolide antibiotics are reported to have fatal drug-drug interactions with colchicine. The displacement interaction between colchicine and azithromycin on binding to BSA was evaluated using spectroscopic techniques, molecular docking and molecular dynamic simulation studies. The binding constant recorded for the binary system BSA-colchicine was 7.44 × 104 whereas, the binding constant for the ternary system BSA-colchicine in presence of azithromycin was 7.38 × 104 and were similar. Azithromycin didn't bind to BSA neither did it interfere in binding of colchicine. The results from molecular docking studies also led to a similar conclusion that azithromycin didn't interfere in the binding of colchicine to BSA. These findings are important since there is possibility of serious adverse event with co-administration of colchicine and azithromycin in patients with underlying gouty arthritis and these patients need to be continuously monitored for colchicine toxicity.
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Affiliation(s)
- Tanveer A Wani
- Department of Pharmaceutical Chemistry, College of Pharmacy, King Saud University, P.O. Box 2457, Riyadh 11451, Saudi Arabia
| | - Ahmed H Bakheit
- Department of Pharmaceutical Chemistry, College of Pharmacy, King Saud University, P.O. Box 2457, Riyadh 11451, Saudi Arabia
| | - Abdulrahman A Al-Majed
- Department of Pharmaceutical Chemistry, College of Pharmacy, King Saud University, P.O. Box 2457, Riyadh 11451, Saudi Arabia
| | - Nojood Altwaijry
- Department of Biochemistry, College of Science, King Saud University, PO Box 22452, Riyadh 11451, Saudi Arabia
| | - Anwar Baquaysh
- Department of Biochemistry, College of Science, King Saud University, PO Box 22452, Riyadh 11451, Saudi Arabia
| | - Ashwaq Aljuraisy
- Department of Biochemistry, College of Science, King Saud University, PO Box 22452, Riyadh 11451, Saudi Arabia
| | - Seema Zargar
- Department of Biochemistry, College of Science, King Saud University, PO Box 22452, Riyadh 11451, Saudi Arabia
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Precupas A, Sandu R, Neculae AVF, Neacsu A, Popa VT. Calorimetric, spectroscopic and computational investigation of morin binding effect on bovine serum albumin stability. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.115953] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Capo A, Natalello A, Marienhagen J, Pennacchio A, Camarca A, Di Giovanni S, Staiano M, D'Auria S, Varriale A. Structural features of the glutamate-binding protein from Corynebacterium glutamicum. Int J Biol Macromol 2020; 162:903-912. [PMID: 32593757 DOI: 10.1016/j.ijbiomac.2020.06.197] [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: 03/19/2020] [Revised: 06/05/2020] [Accepted: 06/21/2020] [Indexed: 10/24/2022]
Abstract
L-glutamate (Glu) is the major excitatory transmitter in mammalian brain. Inadequate concentration of Glu in the brain correlates to mood disorder. In industry, Glu is used as a flavour enhancer in food and in foodstuff processing. A high concentration of Glu has several effects on human health such as hypersensitive effects, headache and stomach pain. The presence of Glu in food can be detected by different analytical methods based on chromatography, or capillary electrophoresis or amperometric techniques. We have isolated and characterized a glutamate-binding protein (GluB) from the Gram-positive bacteria Corynebacterium glutamicum. Together with GluC protein, GluD protein and the cytoplasmic protein GluA, GluB permits the transport of Glu in/out of cell. In this study, we have investigated the binding features of GluB as well as the effect of temperature on its structure both in the absence and in the presence of Glu. The results have showed that GluB has a high affinity and selectivity versus Glu (nanomolar range) and the presence of the ligand induces a higher thermal stability of the protein structure.
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Affiliation(s)
- Alessandro Capo
- Institute of Food Science CNR, via Roma 64, 83100 Avellino, Italy
| | - Antonino Natalello
- Department of Biotechnology and Biosciences, University of Milano-Bicocca, P.zza della Scienza 2, 20126 Milano, Italy
| | - Jan Marienhagen
- Institute of Bio- and Geosciences, IBG-1: Biotechnology, Forschungszentrum Jülich, 52425 Jülich, Germany; Institute of Biotechnology, RWTH Aachen University, Worringer Weg 3, D-52074 Aachen, Germany
| | | | | | | | - Maria Staiano
- Institute of Food Science CNR, via Roma 64, 83100 Avellino, Italy
| | - Sabato D'Auria
- Institute of Food Science CNR, via Roma 64, 83100 Avellino, Italy.
| | - Antonio Varriale
- Institute of Food Science CNR, via Roma 64, 83100 Avellino, Italy
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Eslami-Farsani R, Shareghi B, Farhadian S, Momeni L. Experimental and theoretical investigations on the interaction of glucose molecules with myoglobin in the aqueous solution using theoretical and experimental methods. J Biomol Struct Dyn 2020; 39:6384-6395. [PMID: 32772893 DOI: 10.1080/07391102.2020.1798283] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Osmolytes are generally well-known for the stabilization of proteins. The stabilizing impact of glucose on the dynamics and structure of myoglobin was probed through molecular simulation' docking and spectroscopic procedures. Using thermal stability examinations, the thermodynamic folding properties, point of melting temp. (Tm), thermodynamic enthalpy change (ΔH°) and thermodynamic entropy change (ΔS°) were determined to find out the depiction of myoglobin folding. Glucose operated as an enhancer relative to myoglobin stabilization. The quenching static model was demonstrated by fluorescence spectroscopy. There was one binding site. According to the spectroscopy analysis, glucose was capable of protecting the native structural conformation of protein as well as preventing from protein unfolding. The fluorescence spectroscopy together with simulation through molecular docking method revealed that definitely hydrogen bonding plus van der Waals forces had major contributions to the stabilization of the myoglobin-glucose complex. Hence, the direct interactions contributed slightly to the stabilization impact whereas indirect interactions resulted from the hydration arise from a molecular mechanism primarily inducing the glucose stabilizing impacts. An elevation occurred in the Tm of the myoglobin-glucose complex because of the greater H-bond creation and limited surface hydrophobic activity. Our findings indicate that glucose was capable of protecting the native conformation of myoglobin, clearly describing that glucose stabilization is preferred to be omitted from myoglobin surface. This is because water is more inclined to provide desirable interacting with myoglobin functional groups as compared to glucose. Also, MD results confirmed that the structural changes of myoglobin is the effect of complex formation with glucose.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
| | - Behzad Shareghi
- Department of Biology, Faculty of Science, Shahrekord University, Shahrekord, Iran
| | - Sadegh Farhadian
- Department of Biology, Faculty of Science, Shahrekord University, Shahrekord, Iran.,Central Laboratory, Shahrekord University, Shahrekord, Iran
| | - Lida Momeni
- Department of Biology, Faculty of Science, University of Payame Noor, Tehran, Iran
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Liu R, Yan H, Jiang J, Li J, Liang X, Yang D, Pan L, Xie T, Ma Z. Synthesis, Characterization, Photoluminescence, Molecular Docking and Bioactivity of Zinc (II) Compounds Based on Different Substituents. Molecules 2020; 25:molecules25153459. [PMID: 32751372 PMCID: PMC7436059 DOI: 10.3390/molecules25153459] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Revised: 07/21/2020] [Accepted: 07/24/2020] [Indexed: 01/18/2023] Open
Abstract
Six new zinc(II) complexes were prepared by the reaction of ZnBr2 or ZnI2 with 4′-(substituted-phenyl)-2,2′:6′,2′′-terpyridine compounds, bearing p-methylsulfonyl (L1), p-methoxy (L2) and p-methyl (L3), which were characterized by elemental analysis, FT-IR, NMR and single crystal X-ray diffraction. The antiproliferative properties against Eca-109, A549 and Bel-7402 cell lines and the cytotoxicity test on RAW-264.7 of these compounds were monitored using a CCK-8 assay, and the studies indicate that the complexes show higher antiproliferative activities than cisplatin. The interactions of these complexes with CT-DNA and proteins (BSA) were studied by UV-Vis, circular dichroism (CD) and fluorescent spectroscopy, respectively. The results indicate that the interaction of these zinc(II) complexes with CT-DNA is achieved through intercalative binding, and their strong binding affinity to BSA is fulfilled through a static quenching mechanism. The simulation of the complexes with the CT-DNA fragment and BSA was studied by using molecular docking software. It further validates that the complexes interact with DNA through intercalative binding mode and that they have a strong interaction with BSA.
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Affiliation(s)
- Rongping Liu
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, Guangxi, China; (R.L.); (J.J.); (J.L.); (X.L.)
- National Engineering Research Center for Non-Food Biorefinery, State Key Laboratory of Non-Food Biomass and Enzyme Technology, Guangxi Academy of Sciences, Nanning 530004, Guangxi, China
| | - Hao Yan
- School of Animal Science and Technology, Guangxi University, Nanning 530004, Guangxi, China;
| | - Jinzhang Jiang
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, Guangxi, China; (R.L.); (J.J.); (J.L.); (X.L.)
| | - Jiahe Li
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, Guangxi, China; (R.L.); (J.J.); (J.L.); (X.L.)
| | - Xing Liang
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, Guangxi, China; (R.L.); (J.J.); (J.L.); (X.L.)
| | - Dengfeng Yang
- Guangxi Key Laboratory of Marine Natural Products and Combinatorial Biosynthesis Chemistry, Guangxi Beibu Gulf Marine Research Center, Guangxi Academy of Sciences, Nanning 530004, Guangxi, China;
| | - Lixia Pan
- National Engineering Research Center for Non-Food Biorefinery, State Key Laboratory of Non-Food Biomass and Enzyme Technology, Guangxi Academy of Sciences, Nanning 530004, Guangxi, China
- Correspondence: (L.P.); (T.X.); (Z.M.); Tel.: +86-0771-250-3980 (L.P.)
| | - Tisan Xie
- School of Animal Science and Technology, Guangxi University, Nanning 530004, Guangxi, China;
- Correspondence: (L.P.); (T.X.); (Z.M.); Tel.: +86-0771-250-3980 (L.P.)
| | - Zhen Ma
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, Guangxi, China; (R.L.); (J.J.); (J.L.); (X.L.)
- Correspondence: (L.P.); (T.X.); (Z.M.); Tel.: +86-0771-250-3980 (L.P.)
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9
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Carvalho AM, Fernandes E, Gonçalves H, Giner-Casares JJ, Bernstorff S, Nieder JB, Real Oliveira MECD, Lúcio M. Prediction of paclitaxel pharmacokinetic based on in vitro studies: Interaction with membrane models and human serum albumin. Int J Pharm 2020; 580:119222. [PMID: 32194209 DOI: 10.1016/j.ijpharm.2020.119222] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2019] [Revised: 03/07/2020] [Accepted: 03/09/2020] [Indexed: 01/10/2023]
Abstract
Interactions of paclitaxel (PTX) with models mimicking biological interfaces (lipid membranes and serum albumin, HSA) were investigated to test the hypothesis that the set of in vitro assays proposed can be used to predict some aspects of drug pharmacokinetics (PK). PTX membrane partitioning was studied by derivative spectrophotometry; PTX effect on membrane biophysics was evaluated by dynamic light scattering, fluorescence anisotropy, atomic force microscopy and synchrotron small/wide-angle X-ray scattering; PTX distribution/molecular orientation in membranes was assessed by steady-state/time-resolved fluorescence and computer simulations. PTX binding to HSA was studied by fluorescence quenching, derivative spectrophotometry and dynamic/electrophoretic light scattering. PTX high membrane partitioning is consistent with its efficacy crossing cellular membranes and its off-target distribution. PTX is closely located in the membrane phospholipids headgroups, also interacting with the hydrophobic chains, and causes a major distortion of the alignment of the membrane phospholipids, which, together with its fluidizing effect, justifies some of its cellular toxic effects. PTX binds strongly to HSA, which is consistent with its reduced distribution in target tissues and toxicity by bioaccumulation. In conclusion, the described set of biomimetic models and techniques has the potential for early prediction of PK issues, alerting for the required drug optimizations, potentially minimizing the number of animal tests used in the drug development process.
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Affiliation(s)
- Ana M Carvalho
- CF-UM-UP, Centro de Física das Universidades do Minho e Porto, Departamento de Física da Universidade do Minho, Campus of Gualtar, 4710-057 Braga, Portugal; Nanophotonics Department, Ultrafast Bio- and Nanophotonics Group, INL - International Iberian Nanotechnology Laboratory, Braga, Portugal
| | - Eduarda Fernandes
- CF-UM-UP, Centro de Física das Universidades do Minho e Porto, Departamento de Física da Universidade do Minho, Campus of Gualtar, 4710-057 Braga, Portugal
| | | | - Juan J Giner-Casares
- Department of Physical Chemistry and Applied Thermodynamics, University of Córdoba, Campus de Rabanales, Edificio Marie Curie, Córdoba E-14014, Spain.
| | - Sigrid Bernstorff
- Elettra-Sincrotrone Trieste S.C.p.A., Strada Statale 14, km 163.5, in Area Science Park, I-34149 Basovizza, Trieste, Italy.
| | - Jana B Nieder
- Nanophotonics Department, Ultrafast Bio- and Nanophotonics Group, INL - International Iberian Nanotechnology Laboratory, Braga, Portugal.
| | - M Elisabete C D Real Oliveira
- CF-UM-UP, Centro de Física das Universidades do Minho e Porto, Departamento de Física da Universidade do Minho, Campus of Gualtar, 4710-057 Braga, Portugal.
| | - Marlene Lúcio
- CF-UM-UP, Centro de Física das Universidades do Minho e Porto, Departamento de Física da Universidade do Minho, Campus of Gualtar, 4710-057 Braga, Portugal; CBMA, Centro de Biologia Molecular e Ambiental, Departamento de Biologia, Universidade do Minho, 4710-057 Braga, Portugal.
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10
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Sadeghi-kaji S, Shareghi B, Saboury AA, Farhadian S. Investigating the interaction of porcine pancreatic elastase and propanol: A spectroscopy and molecular simulation study. Int J Biol Macromol 2020; 146:687-691. [DOI: 10.1016/j.ijbiomac.2019.12.119] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2019] [Revised: 12/13/2019] [Accepted: 12/14/2019] [Indexed: 10/25/2022]
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11
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Ullah R, Khan S, Ali H, Bilal M. Potentiality of using front face fluorescence spectroscopy for quantitative analysis of cow milk adulteration in buffalo milk. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2020; 225:117518. [PMID: 31518755 DOI: 10.1016/j.saa.2019.117518] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/01/2019] [Revised: 07/23/2019] [Accepted: 09/04/2019] [Indexed: 06/10/2023]
Abstract
In current study, synchronous front-face fluorescence spectroscopy together with partial least squares regression (PLSR) is used to predict the adulteration of cow and buffalo milk quantitatively. Fresh (unprocessed milk) samples of cow and buffalo were collected from local dairy farms. Fluorescence emission from milk samples mixed in different concentrations, show intensity variations at wavelengths 370-380 nm, 410 nm, 442 nm and 520-560 nm. Among them, the emissions at band position of 442 nm and 525 nm are highly selective between the two species and could help in finding adulteration of cow milk in buffalo milk and vice versa. The emissions at these wavelength positions correspond to fat-soluble vitamin-A as well as β-carotene. PLS regression is used as a statistical prediction model, which is developed by training with the emission spectra of milk samples having known level of adulterations. The developed model predicts the unknown level of adulterations by means of their spectral data. The goodness of the model is determined by the correlation coefficient R-square (r2) value, which in our case is 0.99. Furthermore, the model root mean square error in cross validation (RMSECV) and in prediction (RMSECP) remains 1.16 and 6.24 respectively. This approach can effectively be applied to determine milk adulterations among other species as well as in detecting external agents (fraudulent) added into milk and other dairy products by further studies.
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Affiliation(s)
- Rahat Ullah
- Agri. & Biophotonics Division, National Institute of Lasers and Optronics (NILOP), Lehtrar road, Nilore, P.O. 65450, Islamabad, Pakistan.
| | - Saranjam Khan
- Department of Physics, Islamia College Peshawar, Khyber Pakhtunkhwa, Pakistan
| | - Hina Ali
- Agri. & Biophotonics Division, National Institute of Lasers and Optronics (NILOP), Lehtrar road, Nilore, P.O. 65450, Islamabad, Pakistan
| | - Muhammad Bilal
- Agri. & Biophotonics Division, National Institute of Lasers and Optronics (NILOP), Lehtrar road, Nilore, P.O. 65450, Islamabad, Pakistan
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12
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Sadeghi-kaji S, Shareghi B, Saboury AA, Farhadian S. Investigation on the structure and function of porcine pancreatic elastase (PPE) under the influence of putrescine: A spectroscopy and molecular simulation study. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.111115] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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13
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Wang W, Gan N, Sun Q, Wu D, Zhao L, Suo Z, Tang P, Li H. Binding properties of sodium glucose co-transporter-2 inhibitor empagliflozin to human serum albumin: spectroscopic methods and computer simulations. J Biomol Struct Dyn 2019; 38:3178-3187. [PMID: 31378154 DOI: 10.1080/07391102.2019.1652688] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Empagliflozin is an oral sodium glucose co-transporter-2 inhibitor for type 2 diabetes mellitus. The interaction between empagliflozin and human serum albumin (HSA) was investigated experimentally and theoretically. Fluorescence quenching and time-resolved fluorescence spectroscopy indicated that the quenching mechanism of empagliflozin and HSA was dynamic and that the effective binding constant at body temperature was 3.495 × 103 M-1. Thermodynamic parameters showed that hydrophobic forces were the major binding force in the interaction between empagliflozin and HSA. Circular dichroism, Fourier transform infrared, and 3 D fluorescence spectroscopy revealed that empagliflozin showed a slight change in secondary structure without changing the basic carbon framework of HSA. Site marker displacement experiments revealed that empagliflozin bound to site I of HSA, which was supported by molecular docking. Molecular dynamic simulations indicated that empagliflozin could bind to HSA stably. This study provided insights into the binding mechanism between empagliflozin and HSA.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Wenjing Wang
- School of Chemical Engineering, Sichuan University, Chengdu, China
| | - Na Gan
- School of Chemical Engineering, Sichuan University, Chengdu, China
| | - Qiaomei Sun
- School of Chemical Engineering, Sichuan University, Chengdu, China
| | - Di Wu
- Key Laboratory of Meat Processing of Sichuan, College of Pharmacy and Biological Engineering, Chengdu University, Chengdu, China
| | - Ludan Zhao
- School of Chemical Engineering, Sichuan University, Chengdu, China
| | - Zili Suo
- School of Chemical Engineering, Sichuan University, Chengdu, China
| | - Peixiao Tang
- School of Chemical Engineering, Sichuan University, Chengdu, China
| | - Hui Li
- School of Chemical Engineering, Sichuan University, Chengdu, China
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14
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Wani TA, Bakheit AH, Zargar S, Bhat MA, Al-Majed AA. Molecular docking and experimental investigation of new indole derivative cyclooxygenase inhibitor to probe its binding mechanism with bovine serum albumin. Bioorg Chem 2019; 89:103010. [DOI: 10.1016/j.bioorg.2019.103010] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2018] [Revised: 03/21/2019] [Accepted: 05/21/2019] [Indexed: 01/28/2023]
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Chauhan P, Ghosh KS. Inhibition of copper-induced aggregation of human γD-crystallin by rutin and studies on its role in molecular level for enhancing the chaperone activity of human αA-crystallin by using multi-spectroscopic techniques. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2019; 218:229-236. [PMID: 31003047 DOI: 10.1016/j.saa.2019.04.013] [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] [Received: 12/04/2018] [Revised: 04/07/2019] [Accepted: 04/09/2019] [Indexed: 06/09/2023]
Abstract
Oxidative aggregation of γ-crystallins induced by copper in aged lens increases the lens opacity and causes cataract formation. Therefore, chelation of free Cu2+ by small molecules can inhibit metal-mediated aggregation of γ-crystallin. In this work, the inhibition potency of several naturally occurring flavonoid compounds was studied against aggregation of human γD-crystallin (HGD) mediated by copper ions. Among them, rutin demonstrated ~20% inhibition of HGD aggregation induced by Cu2+ through its metal chelation ability. Not only that, the chaperone activity of lens chaperone, human αA-crystallin (HAA) was found to be enhanced in the presence of rutin. Subsequently, the molecular interactions between HAA and rutin were investigated using fluorescence and CD spectroscopy to understand the molecular basis of the chaperone activity enhancement by rutin. Quenching of HAA fluorescence by rutin with a quenching constant in the order of ~105 M-1 depicts a complexation between them. Entropy driven process of complexation between HAA and rutin suggests significant involvement of hydrophobic interactions. Fluorescence resonance energy transfer between protein and ligand can occur at a distance of 2.73 nm. Synchronous fluorescence and circular dichroism spectroscopy revealed that protein-ligand interaction does not cause any notable conformational changes in HAA. Experimental observations have been well substantiated by docking.
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Affiliation(s)
- Priyanka Chauhan
- Department of Chemistry, National Institute of Technology Hamirpur, Himachal Pradesh 177005, India
| | - Kalyan S Ghosh
- Department of Chemistry, National Institute of Technology Hamirpur, Himachal Pradesh 177005, India.
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16
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Spectroscopic and molecular docking studies on the interaction between spermidine and pancreatic elastase. Int J Biol Macromol 2019; 131:473-483. [DOI: 10.1016/j.ijbiomac.2019.03.084] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2018] [Revised: 02/26/2019] [Accepted: 03/13/2019] [Indexed: 01/30/2023]
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17
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Sadeghi-Kaji S, Shareghi B, Saboury AA, Farhadian S. Spermine as a porcine pancreatic elastase activator: spectroscopic and molecular simulation studies. J Biomol Struct Dyn 2019; 38:78-88. [DOI: 10.1080/07391102.2019.1568306] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
| | - Behzad Shareghi
- Department of Biology, Shahrekord University, Shahrekord, Iran
| | - Ali Akbar Saboury
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran
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18
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Makarska-Bialokoz M, Lipke A. Study of the binding interactions between uric acid and bovine serum albumin using multiple spectroscopic techniques. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2018.12.026] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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19
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Baghaee PT, Divsalar A, Chamani J, Donya A. Human serum albumin–malathion complex study in the presence of silver nanoparticles at different sizes by multi spectroscopic techniques. J Biomol Struct Dyn 2018; 37:2254-2264. [DOI: 10.1080/07391102.2018.1491416] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Parisa Teimoori Baghaee
- Department of Biology, Faculty of Sciences, Mashhad Branch, Islamic Azad University, Mashhad, Iran
| | - Adeleh Divsalar
- Department of Cell & Molecular Biology, Faculty of Biological Sciences, Kharazmi University, Tehran, Iran
| | - Jamshikhan Chamani
- Department of Biology, Faculty of Sciences, Mashhad Branch, Islamic Azad University, Mashhad, Iran
| | - Atena Donya
- Department of Biology, Faculty of Sciences, Mashhad Branch, Islamic Azad University, Mashhad, Iran
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20
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Śliwińska-Hill U, Wiglusz K. Multispectroscopic studies of the interaction of folic acid with glycated human serum albumin. J Biomol Struct Dyn 2018; 37:3731-3739. [DOI: 10.1080/07391102.2018.1526713] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Urszula Śliwińska-Hill
- Department of Analytical Chemistry, Faculty of Pharmacy, Wroclaw Medical University, Wrocław, Poland
| | - Katarzyna Wiglusz
- Department of Analytical Chemistry, Faculty of Pharmacy, Wroclaw Medical University, Wrocław, Poland
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21
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22
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Qiao H, Li B, Zhang H, Liu D, Diao H, Sun G, Xie J. Effects of the equimolarly mixed cationic–nonionic surfactants of didodecyldimethylammonium bromide and polyoxyethylene sorbitan monooleate 80 on serum proteins—spectroscopic study. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2018; 187:151-161. [DOI: 10.1016/j.jphotobiol.2018.08.011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2018] [Revised: 08/06/2018] [Accepted: 08/12/2018] [Indexed: 02/07/2023]
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Characterization of the structural changes of human serum albumin upon interaction with single-walled and multi-walled carbon nanotubes: spectroscopic and molecular modeling approaches. RESEARCH ON CHEMICAL INTERMEDIATES 2018. [DOI: 10.1007/s11164-018-3608-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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24
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Capo A, Pennacchio A, Varriale A, D'Auria S, Staiano M. The porcine odorant-binding protein as molecular probe for benzene detection. PLoS One 2018; 13:e0202630. [PMID: 30183769 PMCID: PMC6124761 DOI: 10.1371/journal.pone.0202630] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2017] [Accepted: 08/06/2018] [Indexed: 11/19/2022] Open
Abstract
In recent years, air pollution has been a subject of great scientific and public interests for the strong impact on human health. Air pollution is due to the presence in the atmosphere of polluting substances, such as carbon monoxide, sulfur and nitrogen oxides, particulates and volatile organic compounds (VOCs), derived predominantly from various combustion processes. Benzene is a VOC belonging to group-I carcinogens with a toxicity widely demonstrated. The emission limit values and the daily exposure time to benzene (TLV-TWA) are 5μg/m3 (0.00157 ppm) and 1.6mg/m3 (0.5 ppm), respectively. Currently, expensive and time-consuming analytical methods are used for detection of benzene. These methods require to perform a few preliminary steps such as sampling, and matrices pre-treatments. In addition, it is also needed the support of specialized personnel. Recently, single-walled carbon nanotube (SWNTs) gas sensors with a limit detection (LOD) of 20 ppm were developed for benzene detection. Other innovative bioassay, called bio-report systems, were proposed. They use a whole cell (Pseudomona putida or Escherichia coli) as molecular recognition element and exhibit a LOD of about 10 μM. Here, we report on the design of a highly sensitive fluorescence assay for monitoring atmospheric level of benzene. For this purpose, we used as molecular recognition element the porcine odorant-binding protein (pOBP). 1-Aminoanthracene was selected as extrinsic fluorescence probe for designing a competitive fluorescence resonance energy transfer (FRET) assay for benzene detection. The detection limit of our assay was 3.9μg/m3, a value lower than the actual emission limit value of benzene as regulated by European law.
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Affiliation(s)
- Alessandro Capo
- Institute of Food Science, Consiglio Nazionale delle Ricerche, Avellino, Italy
| | - Angela Pennacchio
- Institute of Food Science, Consiglio Nazionale delle Ricerche, Avellino, Italy
| | - Antonio Varriale
- Institute of Food Science, Consiglio Nazionale delle Ricerche, Avellino, Italy
| | - Sabato D'Auria
- Institute of Food Science, Consiglio Nazionale delle Ricerche, Avellino, Italy
| | - Maria Staiano
- Institute of Food Science, Consiglio Nazionale delle Ricerche, Avellino, Italy
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25
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Tanzadehpanah H, Mahaki H, Moghadam NH, Salehzadeh S, Rajabi O, Najafi R, Amini R, Saidijam M. Binding site identification of anticancer drug gefitinib to HSA and DNA in the presence of five different probes. J Biomol Struct Dyn 2018; 37:823-836. [DOI: 10.1080/07391102.2018.1441073] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Hamid Tanzadehpanah
- Research Center for Molecular Medicine, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Hanie Mahaki
- Department of Immunology, School of Medicine, Hamadan University of Medical Sciences, Hamadan, Iran
| | | | | | - Omid Rajabi
- Medical Chemistry Department, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Rezvan Najafi
- Research Center for Molecular Medicine, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Razieh Amini
- Research Center for Molecular Medicine, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Massoud Saidijam
- Research Center for Molecular Medicine, Hamadan University of Medical Sciences, Hamadan, Iran
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26
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Mocanu MN, Yan F. Ultrasound-assisted interaction between chlorin-e6 and human serum albumin: pH dependence, singlet oxygen production, and formulation effect. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2018; 190:208-214. [PMID: 28926772 DOI: 10.1016/j.saa.2017.09.017] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2017] [Revised: 08/21/2017] [Accepted: 09/12/2017] [Indexed: 06/07/2023]
Abstract
The interaction between chlorin e6 (Ce6) and human serum albumin (HSA) in the presence and absence of ultrasound have been investigated by ultraviolet-visible absorption spectroscopy and fluorescence spectroscopy. Ce6 is found to bind strongly to HSA at or near physiological pH conditions, but the strength of the binding is significantly weakened at lower pHs. The intrinsic fluorescence of HSA is incrementally quenched with increasing concentration of Ce6, and the quenching is enhanced after exposure to high-frequency ultrasound. Our experimental results suggest that Ce6-induced sonodynamic oxidation of HSA is mainly mediated by singlet oxygen. The formulation of Ce6 by high molecular weight polyvinylpyrrolidone (PVP) increased its stability in aqueous solutions and its quantum yield of singlet oxygen under ultrasound irradiation.
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Affiliation(s)
- Mihaela N Mocanu
- Department of Chemistry and Biochemistry, North Carolina Central University, Durham, NC, USA
| | - Fei Yan
- Department of Chemistry and Biochemistry, North Carolina Central University, Durham, NC, USA.
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27
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Ullah R, Khan S, Javaid S, Ali H, Bilal M, Saleem M. Raman spectroscopy combined with a support vector machine for differentiating between feeding male and female infants mother's milk. BIOMEDICAL OPTICS EXPRESS 2018; 9:844-851. [PMID: 29552417 PMCID: PMC5854083 DOI: 10.1364/boe.9.000844] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2017] [Revised: 01/05/2018] [Accepted: 01/09/2018] [Indexed: 05/22/2023]
Abstract
This study presents differentiation in milk samples of mother's feeding male and female infants using Raman spectroscopy combined with a support vector machine (SVM). Major differences have been observed in the Raman spectra of both types of milk based on their chemical compositions. Overall, it has been found that milk samples of mother's having a female infant are richer in fatty acids, phospholipids, and tryptophan. In contrast, milk samples of mother's having a male infant contain more carotenoids and saccharides. Principal component analysis and SVM further highlighted the differences between the two groups on the basis of differentiating features obtained from their Raman spectra. The SVM model with two different kernels, i.e. polynomial kernel function (order-2) and Gaussian radial basis function (RBF sigma-2), are used for gender based milk differentiations. The performance of the proposed model in terms of accuracy, precision, sensitivity, and specificity using the polynomial kernel function of order-2 have been found to be 86%, 88%, 85% and 88%, respectively.
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Affiliation(s)
- Rahat Ullah
- Agri-Biophotonics Division, National Institute of Lasers and Optronics (NILOP), Nilore, Islamabad 45650, Pakistan
| | - Saranjam Khan
- Agri-Biophotonics Division, National Institute of Lasers and Optronics (NILOP), Nilore, Islamabad 45650, Pakistan
| | - Samina Javaid
- Department of Biotechnology, International Islamic University Islamabad (IIUI), Pakistan
| | - Hina Ali
- Agri-Biophotonics Division, National Institute of Lasers and Optronics (NILOP), Nilore, Islamabad 45650, Pakistan
| | - Muhammad Bilal
- Agri-Biophotonics Division, National Institute of Lasers and Optronics (NILOP), Nilore, Islamabad 45650, Pakistan
| | - Muhammad Saleem
- Agri-Biophotonics Division, National Institute of Lasers and Optronics (NILOP), Nilore, Islamabad 45650, Pakistan
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28
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Xie Y, Peng W, Ding F, Liu SJ, Ma HJ, Liu CL. Quantitative structure-activity relationship (QSAR) directed the discovery of 3-(pyridin-2-yl)benzenesulfonamide derivatives as novel herbicidal agents. PEST MANAGEMENT SCIENCE 2018; 74:189-199. [PMID: 28762622 DOI: 10.1002/ps.4693] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2017] [Revised: 07/12/2017] [Accepted: 07/25/2017] [Indexed: 05/17/2023]
Abstract
BACKGROUND Agrochemicals have been crucial to the production of food, and the need for the development of novel agrochemicals continues unceasing owing to the loss of existing produces via the growth of resistance and the desire for products with more propitious environmental and toxicological patterns. RESULTS The results of both CoMFA and CoMSIA models indicated that biological activity can effectively be improved through the structural optimisation and molecular design of these synthetic compounds from the aspects of steric, electrostatic, hydrophobic, hydrogen bond donor and acceptor fields. Data of postemergence herbicidal activity in the greenhouse explained that most new 3-(pyridin-2-yl)benzenesulfonamide derivatives (4c-4 t) could control highly effectively against barnyardgrass, foxtail, vetleaf, and youth and old age (herbicidal activity ≥90%); for example, compounds 4q-4 t exhibit excellent biological activity equivalent/superior to commercial saflufenacil/sulcotrione at the low concentration of 37.5 g a.i./ha, and in particular, the herbicidal activity of compound 4 t for four experimental plant species is found to be notably greater than saflufenacil (3.75 g a.i./ha). Meanwhile, compound 4 t also has good crop selectivity for weed control in maize. CONCLUSION The novel compounds such as 4 t have remarkable biological activity after the structural optimisation utilising the constructed 3D-QSAR models, i.e. such QSAR models have great accuracy. © 2017 Society of Chemical Industry.
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Affiliation(s)
- Yong Xie
- Laboratory for Computational Biochemistry & Molecular Design, Department of Phytomedicine, Qingdao Agricultural University, Qingdao, China
- State Key Laboratory of the Discovery and Development of Novel Pesticide, Shenyang Sinochem Agrochemicals R&D Co. Ltd., Shenyang, China
| | - Wei Peng
- Laboratory for Computational Biochemistry & Molecular Design, Department of Phytomedicine, Qingdao Agricultural University, Qingdao, China
- Key Laboratory of Integrated Crop Pest Management of Shandong Province, Qingdao, China
- School of Pharmaceutical Science and Technology, Tianjin University, Tianjin, China
- Department of Chemistry, China Agricultural University, Beijing, China
| | - Fei Ding
- Laboratory for Computational Biochemistry & Molecular Design, Department of Phytomedicine, Qingdao Agricultural University, Qingdao, China
- Key Laboratory of Integrated Crop Pest Management of Shandong Province, Qingdao, China
| | - Shu-Jie Liu
- State Key Laboratory of the Discovery and Development of Novel Pesticide, Shenyang Sinochem Agrochemicals R&D Co. Ltd., Shenyang, China
| | - Hong-Juan Ma
- State Key Laboratory of the Discovery and Development of Novel Pesticide, Shenyang Sinochem Agrochemicals R&D Co. Ltd., Shenyang, China
| | - Chang-Ling Liu
- State Key Laboratory of the Discovery and Development of Novel Pesticide, Shenyang Sinochem Agrochemicals R&D Co. Ltd., Shenyang, China
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29
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Singh MP, Baruah JB. Modulation of dual fluorescence modes and emissions of 2-(1,4-dioxo-1,4-dihydro-naphthalen-2-yl-amino)benzoic acid. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2017.08.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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30
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Rabbani N, Tabrez S, Islam BU, Rehman MT, Alsenaidy AM, AlAjmi MF, Khan RA, Alsenaidy MA, Khan MS. Characterization of colchicine binding with normal and glycated albumin: In vitro and molecular docking analysis. J Biomol Struct Dyn 2017; 36:3453-3462. [PMID: 28990867 DOI: 10.1080/07391102.2017.1389661] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
The transport of more than 90% of the drugs viz. anticoagulants, analgesics, and general anesthetics in the blood takes place by albumin. Hence, albumin is the prime protein needs to be investigated to find out the nature of drug binding. Serum albumin molecules are prone to glycation at elevated blood glucose levels as observed in diabetics. In this piece of work, glycation of bovine serum albumin (BSA) was carried out with glyceraldehyde and characterized by molecular docking and fluorometry techniques. Glycation of BSA showed 25% loss of free amino groups and decreased protein fluorescence (60%) with blue shift of 6 nm. The present study was also designed to evaluate the binding of colchicine (an anti-inflammatory drug) to native and glycated BSA and its ability to displace 8-analino-1-nephthalene sulfonic acid (ANS), from the BSA-ANS complex. Binding of ANS to BSA showed strong binding (Ka = 4.4 μM) with native conformation in comparison to glycated state (Ka = 8.4 μM). On the other hand, colchicine was able to quench the fluorescence of native BSA better than glycated BSA and also showed weaker affinity (Ka = 23 μM) for glycated albumin compared with native state (Ka = 16 μM). Molecular docking study showed that both glyceraldehyde and colchicine bind to common residues located near Sudlow's site I that explain the lower binding of colchicine in the glycated BSA. Based on our results, we believe that reduced drugs-binding affinity to glycated albumin may lead to drugs accumulation and precipitation in diabetic patients.
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Affiliation(s)
- Nayyar Rabbani
- a Department of Biochemistry, Protein Research Chair, College of Sciences , King Saud University , Riyadh 11451 , Saudi Arabia
| | - Shams Tabrez
- b King Fahd Medical Research Center , King Abdulaziz University , Jeddah 21589 , Saudi Arabia
| | - Badar Ul Islam
- c Department of Biochemistry, J. N. Medical College , Aligarh Muslim University , Aligarh 202002 , India
| | - Md Tabish Rehman
- d Department of Pharmacognosy, College of Pharmacy , King Saud University , Riyadh 11451 , Saudi Arabia
| | - Abdulrahman M Alsenaidy
- a Department of Biochemistry, Protein Research Chair, College of Sciences , King Saud University , Riyadh 11451 , Saudi Arabia
| | - Mohamed F AlAjmi
- d Department of Pharmacognosy, College of Pharmacy , King Saud University , Riyadh 11451 , Saudi Arabia
| | - Rais Ahmad Khan
- e Department of Chemistry, College of Sciences , King Saud University , Riyadh 11451 , Saudi Arabia
| | - Mohammad A Alsenaidy
- f Department of Pharmaceutics, College of Pharmacy , King Saud University , Riyadh , Saudi Arabia
| | - Mohd Shahnawaz Khan
- a Department of Biochemistry, Protein Research Chair, College of Sciences , King Saud University , Riyadh 11451 , Saudi Arabia
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31
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Dehkhodaei M, Sahihi M, Amiri Rudbari H. Spectroscopic and molecular docking studies on the interaction of Pd(II) & Co(II) Schiff base complexes with β-lactoglobulin as a carrier protein. J Biomol Struct Dyn 2017; 36:3130-3136. [DOI: 10.1080/07391102.2017.1380537] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Monireh Dehkhodaei
- Department of Physical Chemistry, University of Isfahan, Isfahan 81746-73441, Iran
| | - Mehdi Sahihi
- Department of Physical Chemistry, University of Isfahan, Isfahan 81746-73441, Iran
| | - Hadi Amiri Rudbari
- Department of Physical Chemistry, University of Isfahan, Isfahan 81746-73441, Iran
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32
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Chanphai P, Tajmir-Riahi H. Probing the binding of resveratrol, genistein and curcumin with chitosan nanoparticles. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.08.024] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Hao C, Xu G, Feng Y, Lu L, Sun W, Sun R. Fluorescence quenching study on the interaction of ferroferric oxide nanoparticles with bovine serum albumin. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2017; 184:191-197. [PMID: 28499172 DOI: 10.1016/j.saa.2017.05.004] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2016] [Revised: 04/30/2017] [Accepted: 05/04/2017] [Indexed: 06/07/2023]
Abstract
Fluorescence quenching was used to study the potential interaction mechanism of Bovine serum albumin (BSA) with either hydrophilic ferroferric oxide (Fe3O4) nanoparticles (NPs) or hydrophobic Fe3O4 NPs. The experimental results indicated the mechanism between BSA and hydrophilic Fe3O4 NPs was static quenching and the one between BSA and hydrophobic Fe3O4 NPs was dynamic process that was drove by Förster's resonance energy transfer (FRET). And the binding parameters for the interaction of BSA with either hydrophilic or hydrophobic Fe3O4 NPs were calculated by using the fluorescence quenching measurement. The binding constant (KA) values of hydrophilic Fe3O4 NPs were 8518.73±23.35 (at 298K), 1190.31±15.41 (at 306K) and 321.97±8.57 (at 313K), respectively. The thermodynamic analysis implied that the intermolecular forces between BSA and hydrophilic Fe3O4 NPs were Van der Waals interaction or hydrogen bond, because the values of ΔH and ΔS between them were negative. While the one of BSA and hydrophobic Fe3O4 NPs involved hydrophobic forces, owing to the positive ΔH and ΔS between them. But they were all enthalpy-driven and exothermic, since their ΔG values were all negative. Synchronous fluorescence spectroscopy suggested that the conformation of tryptophan residue of BSA was changed in the presence of hydrophilic Fe3O4 NPs or hydrophobic Fe3O4 NPs, because the position of the maximum emission wavelength had a discernible red shift.
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Affiliation(s)
- Changchun Hao
- Laboratory of Biophysics and Biomedical Engineering, School of Physics and Information Technology, Shaanxi Normal University, Xi'an 710062, China.
| | - Guangkuan Xu
- Laboratory of Biophysics and Biomedical Engineering, School of Physics and Information Technology, Shaanxi Normal University, Xi'an 710062, China
| | - Ying Feng
- Laboratory of Biophysics and Biomedical Engineering, School of Physics and Information Technology, Shaanxi Normal University, Xi'an 710062, China
| | - Linhao Lu
- Laboratory of Biophysics and Biomedical Engineering, School of Physics and Information Technology, Shaanxi Normal University, Xi'an 710062, China
| | - Wenyuan Sun
- Laboratory of Biophysics and Biomedical Engineering, School of Physics and Information Technology, Shaanxi Normal University, Xi'an 710062, China
| | - Runguang Sun
- Laboratory of Biophysics and Biomedical Engineering, School of Physics and Information Technology, Shaanxi Normal University, Xi'an 710062, China.
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Makarska-Bialokoz M. Investigation of the binding affinity in vitamin B12-Bovine serum albumin system using various spectroscopic methods. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2017; 184:262-269. [PMID: 28528252 DOI: 10.1016/j.saa.2017.05.014] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2017] [Revised: 05/06/2017] [Accepted: 05/08/2017] [Indexed: 05/28/2023]
Abstract
The binding affinity between vitamin B12 (VitB12) and bovine serum albumin (BSA) has been investigated in aqueous solution at pH=7.4, employing UV-vis absorption and steady-state, synchronous and three-dimensional fluorescence spectra techniques. Representative effects noted for BSA intrinsic fluorescence resulting from the interactions with VitB12 confirm the formation of π-π stacked non-covalent and non-fluorescent complexes in the system VitB12-BSA. All the determined parameters, the binding, fluorescence quenching and bimolecular quenching rate constants (of the order of 104Lmol-1, 103Lmol-1 and 1011Lmol-1s-1, respectively), as well as Förster resonance energy transfer parameters validate the mechanism of static quenching. The interaction with VitB12 induces folding of the polypeptide chains around Trp residues of BSA, resulting in a more hydrophobic surrounding. Presented outcomes suggest that the addition of VitB12 can lead to the more organized BSA conformation and its more folded tertiary structure, what could influence the physiological functions of bovine serum albumin, notably in case of its overuse or abnormal metabolism.
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Affiliation(s)
- Magdalena Makarska-Bialokoz
- Department of Inorganic Chemistry, Maria Curie-Sklodowska University, M. C. Sklodowska Sq. 2, 20-031 Lublin, Poland.
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35
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Wu H, Zhao Y, Tan X, Huang Y, Yuan H, Yang J. A convenient method for determination of malathion based on the resonance Rayleigh scattering enhancement. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2017.05.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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36
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Wani MA, Pandey MD, Pandey R, Maurya SK, Goswami D. A Dual-Signaling Ferrocene-Pyrene Dyad: Triple-Mode Recognition of the Cu(II) Ions in Aqueous Medium. J Fluoresc 2017; 27:2279-2286. [PMID: 28840438 DOI: 10.1007/s10895-017-2169-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2017] [Accepted: 08/10/2017] [Indexed: 11/29/2022]
Abstract
We report a structure of ferrocene-pyrene conjugate (1) comprising electro and photo-active dual-signaling units. In particular, 1 upon interaction with Cu(II), displays selectively one-photon fluorescence quenching, but it shows two-photon absorption (TPA) cross-section 1230 GM (at 780 nm). Further, 1 displayed two irreversible oxidative waves at 0.39 V and 0.80 V (vs Ag/AgCl), in the electrochemical analysis which upon addition of Cu2+, led to the negative potential shift in both the oxidative waves to appear at 0.25 V and 0.68 V. The triple mode changes in presence of Cu(II) suggesting the possible application of 1 for the detection of Cu(II) in aqueous media. Graphical Abstract.
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Affiliation(s)
- Manzoor Ahmad Wani
- Department of Chemistry, Dr. H. S. Gour Central University, Sagar, 470003, India
| | - Mrituanjay D Pandey
- Department of Chemistry, Dr. H. S. Gour Central University, Sagar, 470003, India.
| | - Rampal Pandey
- Department of Chemistry, Dr. H. S. Gour Central University, Sagar, 470003, India.
| | - Sandeep Kumar Maurya
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, 208016, India
| | - Debabrata Goswami
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, 208016, India.
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T PL, Mondal M, Ramadas K, Natarajan S. Molecular interaction of 2,4-diacetylphloroglucinol (DAPG) with human serum albumin (HSA): The spectroscopic, calorimetric and computational investigation. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2017; 183:90-102. [PMID: 28441541 DOI: 10.1016/j.saa.2017.04.012] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2016] [Revised: 03/29/2017] [Accepted: 04/14/2017] [Indexed: 06/07/2023]
Abstract
Drug molecule interaction with human serum albumin (HSA) affects the distribution and elimination of the drug. The compound, 2,4-diacetylphloroglucinol (DAPG) has been known for its antimicrobial, antiviral, antihelminthic and anticancer properties. However, its interaction with HSA is not yet reported. In this study, the interaction between HSA and DAPG was investigated through steady-state fluorescence, time-resolved fluorescence (TRF), circular dichroism (CD), Fourier transform infrared (FT-IR) spectroscopy, isothermal titration calorimetry (ITC), molecular docking and molecular dynamics simulation (MDS). Fluorescence spectroscopy results showed the strong quenching of intrinsic fluorescence of HSA due to interaction with DAPG, through dynamic quenching mechanism. The compound bound to HSA with reversible and moderate affinity which explained its easy diffusion from circulatory system to target tissue. The thermodynamic parameters from fluorescence spectroscopic data clearly revealed the contribution of hydrophobic forces but, the role of hydrogen bonds was not negligible according to the ITC studies. The interaction was exothermic and spontaneous in nature. Binding with DAPG reduced the helical content of protein suggesting the unfolding of HSA. Site marker fluorescence experiments revealed the change in binding constant of DAPG in the presence of site I (warfarin) but not site II marker (ibuprofen) which confirmed that the DAPG bound to site I. ITC experiments also supported this as site I marker could not bind to HSA-DAPG complex while site II marker was accommodated in the complex. In silico studies further showed the lowest binding affinity and more stability of DAPG in site I than in site II. Thus the data presented in this study confirms the binding of DAPG to the site I of HSA which may help in further understanding of pharmacokinetic properties of DAPG.
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Affiliation(s)
- Pragna Lakshmi T
- Centre for Bioinformatics, Pondicherry University, Pondicherry, India
| | - Moumita Mondal
- Department of Biotechnology, Pondicherry University, Pondicherry, India
| | - Krishna Ramadas
- Centre for Bioinformatics, Pondicherry University, Pondicherry, India.
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Khan S, Malla AM, Zafar A, Naseem I. Synthesis of novel coumarin nucleus-based DPA drug-like molecular entity: In vitro DNA/Cu(II) binding, DNA cleavage and pro-oxidant mechanism for anticancer action. PLoS One 2017; 12:e0181783. [PMID: 28763458 PMCID: PMC5538679 DOI: 10.1371/journal.pone.0181783] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2017] [Accepted: 07/06/2017] [Indexed: 01/05/2023] Open
Abstract
Despite substantial research on cancer therapeutics, systemic toxicity and drug-resistance limits the clinical application of many drugs like cisplatin. Therefore, new chemotherapeutic strategies against different malignancies are needed. Targeted cancer therapy is a new paradigm for cancer therapeutics which targets pathways or chemical entities specific to cancer cells than normal ones. Unlike normal cells, cancer cells contain elevated copper which plays an integral role in angiogenesis. Copper is an important metal ion associated with chromatin DNA, particularly with guanine. Thus, targeting copper via copper-specific chelators in cancer cells can serve as an effective anticancer strategy. New pharmacophore di(2-picolyl)amine (DPA)-3(bromoacetyl) coumarin (ligand-L) was synthesized and characterized by IR, ESI-MS, 1H- and 13C-NMR. Binding ability of ligand-L to DNA/Cu(II) was evaluated using a plethora of biophysical techniques which revealed ligand-L-DNA and ligand-L-Cu(II) interaction. Competitive displacement assay and docking confirmed non-intercalative binding mode of ligand-L with ctDNA. Cyclic voltammetry confirmed ligand-L causes quasi reversible Cu(II)/Cu(I) conversion. Further, acute toxicity studies revealed no toxic effects of ligand-L on mice. To evaluate the chemotherapeutic potential and anticancer mechanism of ligand-L, DNA damage via pBR322 cleavage assay and reactive oxygen species (ROS) generation were studied. Results demonstrate that ligand-L causes DNA cleavage involving ROS generation in the presence of Cu(II). In conclusion, ligand-L causes redox cycling of Cu(II) to generate ROS which leads to oxidative DNA damage and pro-oxidant cancer cell death. These findings will establish ligand-L as a lead molecule to synthesize new molecules with better copper chelating and pro-oxidant properties against different malignancies.
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Affiliation(s)
- Saman Khan
- Department of Biochemistry, Faculty of Life Sciences, Aligarh Muslim University, Aligarh, Uttar Pradesh, India
| | - Ali Mohammed Malla
- Department of Chemistry, Government Degree College, Sopore, Kashmir, India
| | - Atif Zafar
- Department of Biochemistry, Faculty of Life Sciences, Aligarh Muslim University, Aligarh, Uttar Pradesh, India
| | - Imrana Naseem
- Department of Biochemistry, Faculty of Life Sciences, Aligarh Muslim University, Aligarh, Uttar Pradesh, India
- * E-mail:
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Kumar S, Basappa Chidananda VK, Hosakere Doddarevanna R, Hamse Kameshwar V, Kaur M, Jasinski JP. 2-((E)-(6-fluorobenzo[d]thiazol-2-ylimino) methyl)-4-chlorophenol; synthesis, characterization, crystal structure, Hirshfeld surface analysis and BSA binding studies. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2017.04.050] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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Kuperman MV, Losytskyy MY, Bykov AY, Yarmoluk SM, Zhizhin KY, Kuznetsov NT, Varzatskii OA, Gumienna-Kontecka E, Kovalska VB. Effective binding of perhalogenated closo -borates to serum albumins revealed by spectroscopic and ITC studies. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2017.03.059] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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da Silva VM, Sato JAP, Araujo JN, Squina FM, Muniz JRC, Riske KA, Garcia W. Systematic studies of the interactions between a model polyphenol compound and microbial β-glucosidases. PLoS One 2017; 12:e0181629. [PMID: 28727856 PMCID: PMC5519169 DOI: 10.1371/journal.pone.0181629] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Accepted: 07/04/2017] [Indexed: 01/22/2023] Open
Abstract
Lignin is a major obstacle for cost-effective conversion of cellulose into fermentable sugars. Non-productive adsorption onto insoluble lignin fragments and interactions with soluble phenols are important inhibition mechanisms of cellulases, including β-glucosidases. Here, we examined the inhibitory effect of tannic acid (TAN), a model polyphenolic compound, on β-glucosidases from the bacterium Thermotoga petrophila (TpBGL1 and TpBGL3) and archaeon Pyrococcus furiosus (PfBGL1). The results revealed that the inhibition effects on β-glucosidases were TAN concentration-dependent. TpBGL1 and TpBGL3 were more tolerant to the presence of TAN when compared with PfBGL1, while TpBGL1 was less inhibited when compared with TpBGL3. In an attempt to better understand the inhibitory effect, the interaction between TAN and β-glucosidases were analyzed by isothermal titration calorimetry (ITC). Furthermore, the exposed hydrophobic surface areas in β-glucosidases were analyzed using a fluorescent probe and compared with the results of inhibition and ITC. The binding constants determined by ITC for the interactions between TAN and β-glucosidases presented the same order of magnitude. However, the number of binding sites and exposed hydrophobic surface areas varied for the β-glucosidases studied. The binding between TAN and β-glucosidases were driven by enthalpic effects and with an unfavorable negative change in entropy upon binding. Furthermore, the data suggest that there is a high correlation between exposed hydrophobic surface areas and the number of binding sites on the inhibition of microbial β-glucosidases by TAN. These studies can be useful for biotechnological applications.
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Affiliation(s)
- Viviam M. da Silva
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC (UFABC), Santo André, São Paulo, Brazil
| | - Juliana A. P. Sato
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC (UFABC), Santo André, São Paulo, Brazil
| | - Juscemácia N. Araujo
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC (UFABC), Santo André, São Paulo, Brazil
| | - Fabio M. Squina
- Programa de Processos Tecnológicos e Ambientais, Universidade de Sorocaba (UNISO), Sorocaba, São Paulo, Brazil
| | - João R. C. Muniz
- Instituto de Física de São Carlos (IFSC), Universidade de São Paulo (USP), São Carlos, São Paulo, Brazil
| | - Karin A. Riske
- Departamento de Biofísica, Universidade Federal de São Paulo, São Paulo, Brazil
| | - Wanius Garcia
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC (UFABC), Santo André, São Paulo, Brazil
- * E-mail:
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Evidence of bovine serum albumin-viologen herbicide binding interaction and associated structural modifications. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2017.03.058] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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The functional and structural stabilization of trypsin by sucrose. Int J Biol Macromol 2017; 99:343-349. [DOI: 10.1016/j.ijbiomac.2017.02.090] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2017] [Revised: 02/16/2017] [Accepted: 02/25/2017] [Indexed: 11/18/2022]
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Xu L, Hu YX, Li J, Liu YF, Zhang L, Ai HX, Liu HS. Probing the binding reaction of cytarabine to human serum albumin using multispectroscopic techniques with the aid of molecular docking. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2017; 173:187-195. [PMID: 28595073 DOI: 10.1016/j.jphotobiol.2017.05.039] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2017] [Revised: 05/22/2017] [Accepted: 05/28/2017] [Indexed: 12/16/2022]
Abstract
Cytarabine is a kind of chemotherapy medication. In the present study, the molecular interaction between cytarabine and human serum albumin (HSA) was investigated via fluorescence, UV-vis absorption, circular dichroism (CD) spectroscopy and molecular docking method under simulative physiological conditions. It was found that cytarabine could effectively quench the intrinsic fluorescence of HSA through a static quenching process. The apparent binding constants between drug and HSA at 288, 293 and 298K were estimated to be in the order of 103L·mol-1. The thermodynamic parameters ΔH°, ΔG°and ΔS° were calculated, in which the negative ΔG°suggested that the binding of cytarabine to HSA was spontaneous, moreover the negative ΔS°and negative ΔH°revealed that van der Waals force and hydrogen bonds were the major forces to stabilize the protein-cytarabine (1:1) complex. The competitive binding experiments showed that the primary binding site of cytarabine was located in the site I (subdomain IIA) of HSA. In addition, the binding distance was calculated to be 3.4nm according to the Förster no-radiation energy transfer theory. The analysis of CD and three-dimensional (3D) fluorescence spectra demonstrated that the binding of drug to HSA induced some conformational changes in HSA. The molecular docking study also led to the same conclusion obtained from the spectral results.
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Affiliation(s)
- Liang Xu
- School of Pharmaceutical Sciences, Liaoning University, Shenyang 110036, PR China; Natural Products Pharmaceutical Engineering Technology Research Center of Liaoning Province, Shenyang 110036, PR China
| | - Yan-Xi Hu
- School of Pharmaceutical Sciences, Liaoning University, Shenyang 110036, PR China
| | - Jin Li
- School of Pharmaceutical Sciences, Liaoning University, Shenyang 110036, PR China
| | - Yu-Feng Liu
- School of Pharmaceutical Sciences, Liaoning University, Shenyang 110036, PR China; Natural Products Pharmaceutical Engineering Technology Research Center of Liaoning Province, Shenyang 110036, PR China.
| | - Li Zhang
- School of Life Science, Liaoning University, Shenyang 110036, PR China
| | - Hai-Xin Ai
- School of Life Science, Liaoning University, Shenyang 110036, PR China
| | - Hong-Sheng Liu
- School of Life Science, Liaoning University, Shenyang 110036, PR China.
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Liu C, Wang T, Bai Y, Wang J. Electrostatic forces govern the binding mechanism of intrinsically disordered histone chaperones. PLoS One 2017; 12:e0178405. [PMID: 28552960 PMCID: PMC5446181 DOI: 10.1371/journal.pone.0178405] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2017] [Accepted: 05/14/2017] [Indexed: 11/18/2022] Open
Abstract
A unified picture to understand the protein recognition and function must include the native binding complex structure ensembles and the underlying binding mechanisms involved in specific biological processes. However, quantifications of both binding complex structures and dynamical mechanisms are still challenging for IDP. In this study, we have investigated the underlying molecular mechanism of the chaperone Chz1 and histone H2A.Z-H2B association by equilibrium and kinetic stopped-flow fluorescence spectroscopy. The dependence of free energy and kinetic rate constant on electrolyte mean activity coefficient and urea concentration are uncovered. Our results indicate a previous unseen binding kinetic intermediate. An initial conformation selection step of Chz1 is also revealed before the formation of this intermediate state. Based on these observations, a mixed mechanism of three steps including both conformation selection and induced fit is proposed. By combination of the ion- and denaturant-induced experiments, we demonstrate that electrostatic forces play a dominant role in the recognition of bipolar charged intrinsically disordered protein Chz1 to its preferred partner H2A.Z-H2B. Both the intra-chain and inter-chain electrostatic interactions have direct impacts on the native collapsed structure and binding mechanism.
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Affiliation(s)
- Chuanbo Liu
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, P.R. China, 130022
- University of Chinese Academy of Sciences, Beijing, P.R. China, 130022
| | - Tianshu Wang
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, P.R. China, 130022
- College of Physics, Jilin University, Chuangchun, Jilin, P. R. China, 130012
| | - Yawen Bai
- Laboratory of Biochemistry and Molecular Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland, United States of America, 20892
| | - Jin Wang
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, P.R. China, 130022
- College of Physics, Jilin University, Chuangchun, Jilin, P. R. China, 130012
- Department of Chemistry and Physics, State University of New York, Stony Brook, New York, United States of America, 11794-3400
- * E-mail:
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Ullah R, Khan S, Ali H, Bilal M, Saleem M. Identification of cow and buffalo milk based on Beta carotene and vitamin-A concentration using fluorescence spectroscopy. PLoS One 2017; 12:e0178055. [PMID: 28542353 PMCID: PMC5436857 DOI: 10.1371/journal.pone.0178055] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2017] [Accepted: 05/08/2017] [Indexed: 11/18/2022] Open
Abstract
The current study presents the application of fluorescence spectroscopy for the identification of cow and buffalo milk based on β-carotene and vitamin-A which is of prime importance from the nutritional point of view. All samples were collected from healthy animals of different breeds at the time of lactation in the vicinity of Islamabad, Pakistan. Cow and buffalo milk shows differences at fluorescence emission appeared at band position 382 nm, 440 nm, 505 nm and 525 nm both in classical geometry (right angle) setup as well as front face fluorescence setup. In front face fluorescence geometry, synchronous fluorescence emission shows clear differences at 410 nm and 440 nm between the milk samples of both these species. These fluorescence emissions correspond to fats, vitamin-A and β-carotene. Principal Component Analysis (PCA) further highlighted these differences by showing clear separation between the two data sets on the basis of features obtained from their fluorescence emission spectra. These results indicate that classical geometry (fixed excitation wavelength) as well as front face (synchronous fluorescence emission) of cow and buffalo milk nutrients could be used as fingerprint from identification point of view. This same approach can effectively be used for the determination of adulterants in the milk and other dairy products.
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Affiliation(s)
- Rahat Ullah
- Agri. & Biophotonics Division, National Institute of Lasers and Optronics (NILOP), Nilore, Islamabad, Pakistan
| | - Saranjam Khan
- Agri. & Biophotonics Division, National Institute of Lasers and Optronics (NILOP), Nilore, Islamabad, Pakistan
| | - Hina Ali
- Agri. & Biophotonics Division, National Institute of Lasers and Optronics (NILOP), Nilore, Islamabad, Pakistan
| | - Muhammad Bilal
- Agri. & Biophotonics Division, National Institute of Lasers and Optronics (NILOP), Nilore, Islamabad, Pakistan
| | - Muhammad Saleem
- Agri. & Biophotonics Division, National Institute of Lasers and Optronics (NILOP), Nilore, Islamabad, Pakistan
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Raghav A, Ahmad J, Alam K. Nonenzymatic glycosylation of human serum albumin and its effect on antibodies profile in patients with diabetes mellitus. PLoS One 2017; 12:e0176970. [PMID: 28520799 PMCID: PMC5435419 DOI: 10.1371/journal.pone.0176970] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2016] [Accepted: 04/20/2017] [Indexed: 12/24/2022] Open
Abstract
Background Albumin glycation and subsequent formation of advanced glycation end products (AGEs) correlate with diabetes and associated complications. Methods Human Serum Albumin (HSA) was modified with D-glucose for a 40 day period under sterile conditions at 37°C. Modified samples along with native HSA (unmodified) were analyzed for structural modifications by UV and fluorescence, FTIR, Liquid chromatography mass spectrometry (LCMS) and X–ray crystallography. New-Zealand white female rabbits immunized with AGEs, represent auto-antibodies formation as assessed by competitive and direct binding enzyme-linked immunosorbent assay (ELISA). Neo-epitopesagainst In-vitro formed AGEs were characterized in patients with diabetes mellitus type 2 (n = 50), type 1 (n = 50), gestational diabetes (n = 50) and type 2 with chronic kidney disease (CKD) with eGFR level 60–89 mL/min (n = 50) from serum direct binding ELISA. Results Glycated-HSA showed amarked increase in hyperchromicity of 65.82%,71.98%, 73.62% and 76.63% at λ280 nm along with anincreasein fluorescence intensity of 65.82%, 71.98%, 73.62% and 76.63% in glycated-HSA compared to native. FTIR results showed theshifting of Amide I peak from 1656 cm_1 to 1659 cm_1 and Amide II peak from 1554 cm_1 to 1564 cm_1 in glycated-HSA, with anew peak appearance of carbonyl group at 1737 cm-1. LCMS chromatogram of glycated-HSA showed thepresence of carboxymethyl lysine (CML) at 279.1 m/z. Immunological analysis showed high antibody titre>1:12,800 in theserum of rabbits immunized with glycated-HSA (modified with 400 mg/dL glucose) and inhibition of 84.65% at anantigen concentration of 20μg/mL. Maximum serum auto-antibody titre was found in T2DM (0.517±0.086), T1DM (0.108±0.092), GDM (0.611±0.041) and T2DM+CKD (0.096±0.25) patients immunized with glycated-HSA (modified with 400 mg/dL glucose). Conclusions Non-enzymatic glycosylation of HSA manifests immunological complications in diabetes mellitus due to change in its structure that enhances neo-epitopes generation.
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Affiliation(s)
- Alok Raghav
- Rajiv Gandhi Centre for Diabetes and Endocrinology,J.N. Medical College,Aligarh Muslim University, Aligarh, Uttar Pradesh, India
| | - Jamal Ahmad
- Rajiv Gandhi Centre for Diabetes and Endocrinology,J.N. Medical College,Aligarh Muslim University, Aligarh, Uttar Pradesh, India
- * E-mail:
| | - Khursheed Alam
- Department of Biochemistry,Faculty of Medicine,J.N. Medical College,Aligarh Muslim University, Aligarh, Uttar Pradesh, India
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Biological effects of α-adrenergic phentolamine on erythrocyte hemeprotein: Molecular insights from biorecognition behavior, protein dynamics and flexibility. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2017; 171:75-84. [PMID: 28482223 DOI: 10.1016/j.jphotobiol.2017.04.035] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2017] [Revised: 04/26/2017] [Accepted: 04/27/2017] [Indexed: 12/31/2022]
Abstract
Phentolamine is one of the most representative nonselective α-adrenoreceptor blocking agents, which have been proved to be owned various pharmacological actions. Unfortunately, whether erythrocytes in the veins intervene in biological behaviors of such drug are largely obscured. With the aid of multiple biophysical techniques, this scenario was to detailed explore the potential biorecognition between phentolamine and the hemeprotein in the cytosol of erythrocytes, and the influences of dynamic characters of protein during the bioreaction. Steady-state and time-resolved fluorescence data manifested that the biomolecular recognition of phentolamine by hemeprotein was processed through the biopolymer-drug adduct with a moderate strength of 104M-1. Such procedure causes a reduction in fluorescence intensity of the aromatic tryptophan (Trp) residues, and the R-T transition of the globular protein occurred concurrently. Circular dichroism demonstrated the conclusions of fluorescence essays, viz. biorecognition can induce fairly structural transformation (self-regulation) of protein conformation. Furthermore, one could find that a specific domain for phentolamine is located at the polypeptide chains α1β2 interface, and hydrogen bonds, π-conjugated and hydrophobic effects are discovered to be held the lowest energy state of the biomacromolecule-drug biosystem, which overtly matches the outcomes of wet experiments. Meanwhile, several crucial residues such as Trp-37 and Arg-40 were confirmed to have directly noncovalent interactions with phentolamine, and the effect of the heme group on the biomolecule-drug recognition is minimal. Further analyses of molecular dynamics simulation supported that the inherent protein flexibility may notably elicit alterations in some key noncovalent bonds between biomacromolecule and drug during the dynamic biointeraction, which might primarily be attributed to the torsion of drug structure and the conformational changes of essential residues. Undoubtedly, this research will not only help to thoroughly unearth the pharmacological profiles of phentolamine, but to elaborate the impacts of the intrinsic features (i.e. dynamics and flexibility) of critically cellular proteins on the biological conducts of active α-adrenergic blockers.
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Laskar AA, Khan MA, Askari F, Younus H. Thymoquinone binds and activates human salivary aldehyde dehydrogenase: Potential therapy for the mitigation of aldehyde toxicity and maintenance of oral health. Int J Biol Macromol 2017; 103:99-110. [PMID: 28472683 DOI: 10.1016/j.ijbiomac.2017.04.112] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2017] [Revised: 04/27/2017] [Accepted: 04/28/2017] [Indexed: 01/28/2023]
Abstract
Human salivary aldehyde dehydrogenase (hsALDH) is a very important anti-oxidant enzyme present in the saliva. It is involved in the detoxification of toxic aldehydes and maintenance of oral health. Reduced level of hsALDH activity is a risk factor for oral cancer development. Thymoquinone (TQ) has many pharmacological activities and health benefits. This study aimed to examine the activation of hsALDH by TQ. The effect of TQ on the activity and kinetics of hsALDH was studied. The binding of TQ with the enzyme was examined by different biophysical methods and molecular docking analysis. TQ enhanced the dehydrogenase activity of crude and purified hsALDH by 3.2 and 2.9 fold, respectively. The Km of the purified enzyme decreased and the Vmax increased. The esterase activity also increased by 1.2 fold. No significant change in the nucleophilicity of the catalytic cysteine residue was observed. TQ forms a strong complex with hsALDH without altering the secondary structures of the enzyme. It fits in the active site of ALDH3A1 close to Cys 243 and the other highly conserved amino acid residues which lead to enhancement of substrate binding affinity and catalytic efficiency of the enzyme. TQ is expected to give better protection from toxic aldehydes in the oral cavity and to reduce the risk of oral cancer development through the activation of hsALDH. Therefore, the addition of TQ in the diet and other oral formulations is expected to be beneficial for health.
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Affiliation(s)
- Amaj Ahmed Laskar
- Enzymology Laboratory, Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, 202002, India
| | - Masood Alam Khan
- College of Applied Medical Sciences, Qassim University, Buraydah, 51452, Saudi Arabia
| | - Fizza Askari
- Enzymology Laboratory, Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, 202002, India
| | - Hina Younus
- Enzymology Laboratory, Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, 202002, India.
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Chanphai P, Kreplak L, Tajmir-Riahi HA. Al cation induces aggregation of serum proteins. J Pharm Biomed Anal 2017; 141:234-240. [PMID: 28458192 DOI: 10.1016/j.jpba.2017.04.027] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2017] [Revised: 04/15/2017] [Accepted: 04/18/2017] [Indexed: 11/28/2022]
Abstract
Al cation is known to induce protein fibrillation and causes several neurodegenerative disorders. We report the spectroscopic, thermodynamic analysis and AFM imaging for the Al cation binding process with human serum albumin (HSA), bovine serum albumin (BSA) and milk beta-lactoglobulin (b-LG) in aqueous solution at physiological pH. Hydrophobicity played a major role in Al-protein interactions with more hydrophobic b-LG forming stronger Al-protein complexes. Thermodynamic parameters ΔS, ΔH and ΔG showed Al-protein bindings occur via hydrophobic and H-bonding contacts for b-LG, while van der Waals and H-bonding interactions prevail in HSA and BSA adducts. AFM clearly indicated that aluminum cations are able to force BSA and b-LG into larger or more robust aggregates than HSA, with HSA 4±0.2 (SE, n=801) proteins per aggregate, for BSA 17±2 (SE, n=148), and for b-LG 12±3 (SE, n=151). Thioflavin T test showed no major protein fibrillation in the presence of Al cation. Al complexation induced major alterations of protein conformations with the order of perturbations b-LG>BSA>HSA.
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Affiliation(s)
- P Chanphai
- Department of Chemistry-Biochemistry and Physics, University of Québec at Trois-Rivières, C. P. 500, TR, Quebec, Canada G9A 5H7
| | - L Kreplak
- Department of Physics and Atmospheric Science, Sir James Dunn Building Dalhousie University, Lord Dalhousie Drive, Halifax, Canada NS B3H 4R2
| | - H A Tajmir-Riahi
- Department of Chemistry-Biochemistry and Physics, University of Québec at Trois-Rivières, C. P. 500, TR, Quebec, Canada G9A 5H7.
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