1
|
Kabir MZ, Tayyab H, Erkmen C, Mohamad SB, Uslu B. Comprehensive views toward the biomolecular recognition of an anticancer drug, leflunomide with human serum albumin. J Biomol Struct Dyn 2024; 42:7257-7271. [PMID: 37529911 DOI: 10.1080/07391102.2023.2239931] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2023] [Accepted: 07/16/2023] [Indexed: 08/03/2023]
Abstract
Biomolecular association of an anticancer drug, leflunomide (LEF) with human serum albumin (HSA), the leading ligands carrier in human circulation was characterized using biophysical (i.e., fluorescence, absorption and voltammetric) methods and computational (i.e., molecular docking and molecular dynamics simulation) techniques. Evaluations of fluorescence, absorption and voltammetric findings endorsed the complex formation between LEF and HSA. An inverse relationship of Stern-Volmer constant-temperature and hyperchromic shift of the protein's absorption signal with addition of LEF confirmed the LEF quenched the HSA fluorescence through static process. Moderate nature of binding strength (binding constant = 2.76-4.77 × 104 M-1) was detected towards the LEF-HSA complexation, while the association process was naturally driven via hydrophobic interactions, van der Waals interactions and hydrogen bonds, as evident from changes in entropy (ΔS= + 19.91 J mol-1 K-1) and enthalpy (ΔH = - 20.09 kJ mol-1), and molecular docking assessments. Spectral analyses of synchronous and three-dimensional fluorescence validated microenvironmental fluctuations near Trp and Tyr residues upon LEF binding to the protein. LEF association with HSA significantly defended temperature-induced destabilization of the protein. Although LEF was found to attach to HSA at Sudlow's sites I and II, but exhibited greater preference toward its site I, as detected by the investigations of competitive site-marker displacement. Molecular dynamics simulation assessment revealed that the complex attained equilibrium throughout simulations, showing the LEF-HSA complex constancy.Communicated by Ramaswamy H. Sarma.
Collapse
Affiliation(s)
- Md Zahirul Kabir
- Faculty of Pharmacy, Department of Analytical Chemistry, Ankara University, Ankara, Turkey
| | - Hafsa Tayyab
- Faculty of Science, Bioinformatics Programme, Institute of Biological Sciences, University of Malaya, Kuala Lumpur, Malaysia
| | - Cem Erkmen
- Faculty of Pharmacy, Department of Analytical Chemistry, Ankara University, Ankara, Turkey
| | - Saharuddin B Mohamad
- Faculty of Science, Bioinformatics Programme, Institute of Biological Sciences, University of Malaya, Kuala Lumpur, Malaysia
- Centre of Research for Computational Sciences and Informatics for Biology, Bioindustry, Environment, Agriculture and Healthcare, University of Malaya, Kuala Lumpur, Malaysia
| | - Bengi Uslu
- Faculty of Pharmacy, Department of Analytical Chemistry, Ankara University, Ankara, Turkey
| |
Collapse
|
2
|
Obafemi BA, Adedara IA, Rocha JBT. Neurotoxicity of ochratoxin A: Molecular mechanisms and neurotherapeutic strategies. Toxicology 2023; 497-498:153630. [PMID: 37709162 DOI: 10.1016/j.tox.2023.153630] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2023] [Revised: 08/28/2023] [Accepted: 09/11/2023] [Indexed: 09/16/2023]
Abstract
Data from epidemiological and experimental studies have evidenced that some chemical contaminants in food elicit their harmful effects by targeting the central nervous system. Ochratoxin A is a foodborne mycotoxin produced by Aspergillus and Penicillium species. Research on neurotoxicity associated with ochratoxin A exposure has increased greatly in recent years. The present review accrued substantial evidence on the neurotoxicity associated with ochratoxin A exposure as well as discussed notable susceptible targets of noxious ochratoxin A at molecular, cellular and genetic levels. Specifically, the neurotoxic mechanisms associated with ochratoxin A exposure were unequivocally unraveled in vitro using human neuroblastoma SH-SY5Y cells, mouse hippocampal HT22 cells, human astrocyte (NHA-SV40LT) cells and microglia cells as well as in vivo using mammalian and non-mammalian models. Data from human biomonitoring studies on plasma ochratoxin A levels in patients with neurodegenerative diseases with some age- and sex-related responses were also highlighted. Moreover, the neurotherapeutic mechanisms of some naturally occurring bioactive compounds against ochratoxin A neurotoxicity are reviewed. Collectively, accumulated data from literature demonstrate that ochratoxin A is a neurotoxin with potential pathological involvement in neurological disorders. Cutting edge original translational research on the development of neurotherapeutics for neurotoxicity associated with foodborne toxicants including ochratoxin A is indispensable.
Collapse
Affiliation(s)
- Blessing A Obafemi
- Department of Biochemistry and Molecular Biology, Federal University of Santa Maria, 97105-900 Santa Maria, RS, Brazil; Department of Medical Biochemistry, College of Medicine and Health Sciences, Afe Babalola University, Ado-Ekiti, Nigeria
| | - Isaac A Adedara
- Department of Food Science and Technology, Center of Rural Sciences, Federal University of Santa Maria, Camobi, 97105- 900 Santa Maria, RS, Brazil.
| | - Joao B T Rocha
- Department of Biochemistry and Molecular Biology, Federal University of Santa Maria, 97105-900 Santa Maria, RS, Brazil
| |
Collapse
|
3
|
Qureshi MA, Amir M, Khan RH, Musarrat J, Javed S. Glycation reduces the binding dynamics of aflatoxin B 1 to human serum albumin: a comprehensive spectroscopic and computational investigation. J Biomol Struct Dyn 2023; 41:14797-14811. [PMID: 37021366 DOI: 10.1080/07391102.2023.2194000] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2023] [Accepted: 02/25/2023] [Indexed: 04/07/2023]
Abstract
Aflatoxin B1 (AFB1), a potent mutagen, is synthesized by Aspergillus parasiticus and Aspergillus flavus. Human serum albumin (HSA) is a globular protein with diverse roles. As AFB1 is ingested with food and is transported in the body via blood, it becomes pertinent to comprehend the effect of the binding of this toxin on the structure and conformation of HSA, which may help to get insight into the toxic effect of the exposure of the mycotoxin. In this study, multi-spectroscopic approaches have been used to evaluate the binding efficiency of AFB1 with both the native HSA (nHSA) and the glycated HSA (gHSA). Steady-state fluorescence spectroscopy reveals the static type of fluorescence quenching in the fluorescence emission spectra of nHSA and gHSA in the presence of AFB1. The binding constant (Kb) is calculated to be 6.88 × 104 M-1 for nHSA, while a reduced Kb value of 2.95 × 104 M-1 has been obtained for gHSA. The circular dichroism study confirms the change in the secondary structure of nHSA and gHSA in the presence of AFB1, followed by alterations in the melting temperature (Tm) of nHSA and gHSA. In silico computational findings envisaged the amino acid residues and bonds involved in the binding of nHSA and gHSA with AFB1. The comprehensive study analyzes the binding effectiveness of AFB1 with nHSA and gHSA and shows reduced binding of AFB1 to gHSA.Communicated by Ramaswamy H. Sarma.
Collapse
Affiliation(s)
- Mohd Aamir Qureshi
- Department of Biochemistry, Faculty of Life Sciences, Aligarh Muslim University, Aligarh, India
| | - Mohd Amir
- Department of Biochemistry, Faculty of Life Sciences, Aligarh Muslim University, Aligarh, India
| | - Rizwan Hasan Khan
- Interdisciplinary Biotechnology Unit, Faculty of Life Sciences, Aligarh Muslim University, Aligarh, India
| | - Javed Musarrat
- Department of Agricultural Microbiology, Faculty of Agricultural Sciences, Aligarh Muslim University, Aligarh, India
| | - Saleem Javed
- Department of Biochemistry, Faculty of Life Sciences, Aligarh Muslim University, Aligarh, India
| |
Collapse
|
4
|
Subchronic exposure of individual and combined ochratoxin A and citrinin selectively affects the expression of rat renal organic cation transporters. Mycotoxin Res 2022; 38:61-70. [PMID: 35028911 DOI: 10.1007/s12550-022-00450-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Revised: 12/27/2021] [Accepted: 01/05/2022] [Indexed: 10/19/2022]
Abstract
Ochratoxin A (OTA) and citrinin (CIT) are nephrotoxins found co-occurring in various human/animal food/feed and recognized as a health threat. However, most studies investigate individual effects and neglect their combined nephrotoxic effects in mammals. Previous studies have indicated that organic anion/cation transporters (OATs/OCTs) localized in renal proximal tubules mediate the transport of OTA and CIT. Still, little is known about the in vivo effects of individual/combined OTA and CIT on protein localization/expression of OCTs, physiologically/pharmacologically important renal transporters. Here, we used Western blot and immunofluorescence microscopy to study the effects of subchronic (21-day) exposure to individual/combined OTA (0.125 and 0.250 mg kg-1 b.w.) and CIT (20 mg kg-1 b.w.) on protein localization/expression of organic cation transporters (rOct1/Slc22a1 and rOct2/Slc22a2) in kidneys of Wistar rats. Since the antioxidant resveratrol (RSV) has shown measurable protective effects against OTA- and CIT-related oxidative stress toxicity in vitro, we investigated the effects of an OTA + CIT + RSV combination on rOct1/2 localization/expression in the same model. Individual OTA induced a dose-dependent decrease of rOct1 but not rOct2 protein expression, whereas their localization pattern remained unchanged. Individual CIT did not affect the renal rOct1/2 protein localization/expression. Combined OTA + CIT exposure induced a significant decrease of rOct1 protein expression by an OTA250 dose, whereas oral co-administration of OTA + CIT + RSV resulted in a significant decrease of rOct1/2 protein expression. Thus, we revealed an OTA-related selective effect on the rOct1/2 protein expression and a non-specific adverse effect of RSV in the OTA + CIT + RSV combination on the renal organic cation transport system in rat.
Collapse
|
5
|
Qureshi MA, Javed S. Aflatoxin B 1 Induced Structural and Conformational Changes in Bovine Serum Albumin: A Multispectroscopic and Circular Dichroism-Based Study. ACS OMEGA 2021; 6:18054-18064. [PMID: 34308039 PMCID: PMC8296610 DOI: 10.1021/acsomega.1c01799] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2021] [Accepted: 06/23/2021] [Indexed: 05/15/2023]
Abstract
Aflatoxin B1 (AFB1) is a mutagen that has been categorized as a group 1 human carcinogen by the International Agency for Research on Cancer. It is produced as a secondary metabolite by soil fungi Aspergillus flavus and Aspergillus parasiticus . Here, in this study, the effect of AFB1 on the structure and conformation of bovine serum albumin (BSA) using multispectroscopic tools like fluorescence spectroscopy, ultraviolet-visible absorption spectroscopy, and circular dichroism spectropolarimetry has been ascertained. Ultraviolet absorption spectroscopy revealed hyperchromicity in the absorption spectra of BSA in the presence of AFB1. The binding constant was calculated in the range of 104 M-1, by fluorescence spectroscopy suggesting moderate binding of the toxin to BSA. The study also confirms the static nature of fluorescence quenching. The stoichiometry of binding sites was found to be unity. The competing capability of warfarin for AFB1 was higher than ibuprofen as calculated from site marker displacement assay. Förster resonance energy transfer confirmed the high efficiency of energy transfer from BSA to AFB1. Circular dichroism spectropolarimetry showed a decrease in the α-helix in BSA in the presence of AFB1. The melting temperature of BSA underwent an increment in the presence of a mycotoxin from 62.5 to 70.3 °C. Molecular docking confirmed the binding of AFB1 to subdomain IIA in BSA.
Collapse
|
6
|
Banerjee S, Kistwal T, Sajeevan A, Datta A. Release of Warfarin from Human Serum Albumin by Water‐soluble CdSe Nanotetrapods. Chemphyschem 2020; 21:2709-2714. [DOI: 10.1002/cphc.202000292] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2020] [Revised: 09/27/2020] [Indexed: 01/03/2023]
Affiliation(s)
- Sucheta Banerjee
- Department of Chemistry Indian Institute of Technology Bombay Powai, Mumbai 400 076 India
| | - Tanuja Kistwal
- Department of Chemistry Indian Institute of Technology Bombay Powai, Mumbai 400 076 India
| | - Amritha Sajeevan
- Department of Chemical Sciences Indian Institute of Science Education and Research Kolkata Campus Rd Mohanpur, West Bengal 741246 India
| | - Anindya Datta
- Department of Chemistry Indian Institute of Technology Bombay Powai, Mumbai 400 076 India
| |
Collapse
|
7
|
Faisal Z, Vörös V, Fliszár-Nyúl E, Lemli B, Kunsági-Máté S, Csepregi R, Kőszegi T, Zsila F, Poór M. Probing the Interactions of Ochratoxin B, Ochratoxin C, Patulin, Deoxynivalenol, and T-2 Toxin with Human Serum Albumin. Toxins (Basel) 2020; 12:toxins12060392. [PMID: 32545742 PMCID: PMC7354631 DOI: 10.3390/toxins12060392] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2020] [Revised: 06/08/2020] [Accepted: 06/10/2020] [Indexed: 01/03/2023] Open
Abstract
Ochratoxins, patulin, deoxynivalenol, and T-2 toxin are mycotoxins, and common contaminants in food and drinks. Human serum albumin (HSA) forms complexes with certain mycotoxins. Since HSA can affect the toxicokinetics of bound ligand molecules, the potential interactions of ochratoxin B (OTB), ochratoxin C (OTC), patulin, deoxynivalenol, and T-2 toxin with HSA were examined, employing spectroscopic (fluorescence, UV, and circular dichroism) and ultrafiltration techniques. Furthermore, the influence of albumin on the cytotoxicity of these xenobiotics was also evaluated in cell experiments. Fluorescence studies showed the formation of highly stable OTB–HSA and OTC–HSA complexes. Furthermore, fluorescence quenching and circular dichroism measurements suggest weak or no interaction of patulin, deoxynivalenol, and T-2 toxin with HSA. In ultrafiltration studies, OTB and OTC strongly displaced the Sudlow’s site I ligand warfarin, while other mycotoxins tested did not affect either the albumin binding of warfarin or naproxen. The presence of HSA significantly decreased or even abolished the OTB- and OTC-induced cytotoxicity in cell experiments; however, the toxic impacts of patulin, deoxynivalenol, and T-2 toxin were not affected by HSA. In summary, the complex formation of OTB and OTC with albumin is relevant, whereas the interactions of patulin, deoxynivalenol, and T-2 toxin with HSA may have low toxicological importance.
Collapse
Affiliation(s)
- Zelma Faisal
- Department of Pharmacology, Faculty of Pharmacy, University of Pécs, Szigeti út 12, H-7624 Pécs, Hungary; (Z.F.); (V.V.); (E.F.-N.)
- János Szentágothai Research Centre, Ifjúság útja 20, H-7624 Pécs, Hungary; (B.L.); (S.K.-M.); (R.C.); (T.K.)
| | - Virág Vörös
- Department of Pharmacology, Faculty of Pharmacy, University of Pécs, Szigeti út 12, H-7624 Pécs, Hungary; (Z.F.); (V.V.); (E.F.-N.)
- János Szentágothai Research Centre, Ifjúság útja 20, H-7624 Pécs, Hungary; (B.L.); (S.K.-M.); (R.C.); (T.K.)
| | - Eszter Fliszár-Nyúl
- Department of Pharmacology, Faculty of Pharmacy, University of Pécs, Szigeti út 12, H-7624 Pécs, Hungary; (Z.F.); (V.V.); (E.F.-N.)
- János Szentágothai Research Centre, Ifjúság útja 20, H-7624 Pécs, Hungary; (B.L.); (S.K.-M.); (R.C.); (T.K.)
| | - Beáta Lemli
- János Szentágothai Research Centre, Ifjúság útja 20, H-7624 Pécs, Hungary; (B.L.); (S.K.-M.); (R.C.); (T.K.)
- Institute of Organic and Medicinal Chemistry, Medical School, University of Pécs, Szigeti út 12, H-7624 Pécs, Hungary
| | - Sándor Kunsági-Máté
- János Szentágothai Research Centre, Ifjúság útja 20, H-7624 Pécs, Hungary; (B.L.); (S.K.-M.); (R.C.); (T.K.)
- Institute of Organic and Medicinal Chemistry, Medical School, University of Pécs, Szigeti út 12, H-7624 Pécs, Hungary
| | - Rita Csepregi
- János Szentágothai Research Centre, Ifjúság útja 20, H-7624 Pécs, Hungary; (B.L.); (S.K.-M.); (R.C.); (T.K.)
- Department of Laboratory Medicine, University of Pécs, Medical School, Ifjúság útja 13, H-7624 Pécs, Hungary
| | - Tamás Kőszegi
- János Szentágothai Research Centre, Ifjúság útja 20, H-7624 Pécs, Hungary; (B.L.); (S.K.-M.); (R.C.); (T.K.)
- Department of Laboratory Medicine, University of Pécs, Medical School, Ifjúság útja 13, H-7624 Pécs, Hungary
| | - Ferenc Zsila
- Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Magyar Tudósok krt. 2, H-1117 Budapest, Hungary;
| | - Miklós Poór
- Department of Pharmacology, Faculty of Pharmacy, University of Pécs, Szigeti út 12, H-7624 Pécs, Hungary; (Z.F.); (V.V.); (E.F.-N.)
- János Szentágothai Research Centre, Ifjúság útja 20, H-7624 Pécs, Hungary; (B.L.); (S.K.-M.); (R.C.); (T.K.)
- Correspondence: ; Tel.: +36-536-000 (ext. 35052)
| |
Collapse
|
8
|
Tayyab S, Magesvaran MKA, Kabir MZ, Ridzwan NFW, Mohamad SB. Biophysical and computational view on the in vitro combination between an anticancer drug, saracatinib and human serum albumin. J Biomol Struct Dyn 2020; 39:3565-3575. [PMID: 32397949 DOI: 10.1080/07391102.2020.1766571] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Interaction behaviour of an anticancer drug, saracatinib (SCB) with human serum albumin (HSA), the major carrier protein in human blood circulation was investigated using fluorescence and absorption spectroscopy as well as computational methods. Analysis of the fluorescence quenching data along with absorption results confirmed the complex formation between SCB and HSA, based on the inverse correlation of the Stern-Volmer constant (KSV) with temperature and hyperchromic effect in the absorption spectra. Moderate binding affinity between SCB and HSA was evident from the binding constant, Ka value (1.08-0.74 × 104 M-1), while the SCB-HSA complexation was anticipated to be stabilized by hydrophobic and van der Waals interactions along with hydrogen bonds, as revealed from the thermodynamic data (ΔS = + 29.40 J mol-1 K-1 and ΔH = - 13.90 kJ mol-1). Addition of SCB to HSA significantly defended the thermal denaturation of the protein, though it perturbed the surrounding medium around Tyr and Trp residues. Site marker displacement results elucidated Sudlow's site I, positioned in subdomain IIA of HSA as the preferred binding site of SCB, which was well supported by molecular docking. Molecular dynamics simulation results suggested the stability of the SCB-HSA complex.Communicated by Ramaswamy H. Sarma.
Collapse
Affiliation(s)
- Saad Tayyab
- Biomolecular Research Group, Biochemistry Programme, Institute of Biological Sciences, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia.,Centre of Research for Computational Sciences and Informatics for Biology, Bioindustry, Environment, Agriculture and Healthcare, University of Malaya, Kuala Lumpur, Malaysia
| | - Milisha Koh A Magesvaran
- Biomolecular Research Group, Biochemistry Programme, Institute of Biological Sciences, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia
| | - Md Zahirul Kabir
- Biomolecular Research Group, Biochemistry Programme, Institute of Biological Sciences, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia
| | - Nor Farrah Wahidah Ridzwan
- Bioinformatics Programme, Institute of Biological Sciences, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia
| | - Saharuddin B Mohamad
- Centre of Research for Computational Sciences and Informatics for Biology, Bioindustry, Environment, Agriculture and Healthcare, University of Malaya, Kuala Lumpur, Malaysia.,Bioinformatics Programme, Institute of Biological Sciences, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia
| |
Collapse
|
9
|
Kabir MZ, Benbekhti Z, Ridzwan NFW, Merrouche R, Bouras N, Mohamad SB, Tayyab S. Biophysical and in silico investigations of the molecular association between a potent RNA polymerase inhibitor, thiolutin and human serum albumin. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.112648] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
|
10
|
Yuan H, Gong J, Tang K, Huang J, Xiao G, Lv J. Milk oligopeptide inhibition of (α)-tocopherol fortified linoleic acid oxidation. INTERNATIONAL JOURNAL OF FOOD PROPERTIES 2019. [DOI: 10.1080/10942912.2019.1657888] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Haina Yuan
- School of Biological and Chemical Engineering, Zhejiang University of Science and Technology, Zhejiang Provincial Collaborative Innovation Center of Agricultural Biological Resources Biochemical Manufacturing, Zhejiang Provincial Key Lab for Chem&Bio Processing Technology of Farm Produces, Hangzhou, ZJ, China
| | - Jinyan Gong
- School of Biological and Chemical Engineering, Zhejiang University of Science and Technology, Zhejiang Provincial Collaborative Innovation Center of Agricultural Biological Resources Biochemical Manufacturing, Zhejiang Provincial Key Lab for Chem&Bio Processing Technology of Farm Produces, Hangzhou, ZJ, China
| | - Kun Tang
- Department of Endocrinology, The Affiliated Hospital of Guizhou Medical University, Guiyang, GZ, China
| | - Jinge Huang
- Department of Biological Engineering, Utah State University, Logan, UT, USA
| | - Gongnian Xiao
- School of Biological and Chemical Engineering, Zhejiang University of Science and Technology, Zhejiang Provincial Collaborative Innovation Center of Agricultural Biological Resources Biochemical Manufacturing, Zhejiang Provincial Key Lab for Chem&Bio Processing Technology of Farm Produces, Hangzhou, ZJ, China
| | - Jianmin Lv
- Laboratory Animal Research Center, Zhejiang Chinese Medical University, Hangzhou, ZJ, China
| |
Collapse
|
11
|
Kabir MZ, Roslan AA, Ridzwan NFW, Mohamad SB, Tayyab S. Biomolecular interaction of a platelet aggregation inhibitor, 3,4-methylenedioxy-β-nitrostyrene with human serum albumin: multi-spectral and computational characterization. J Biomol Struct Dyn 2019; 38:2693-2703. [PMID: 31271347 DOI: 10.1080/07391102.2019.1640133] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Molecular interaction of the 3,4-methylenedioxy-β-nitrostyrene (MNS), an inhibitor of platelet aggregation with the main transport protein, albumin from human serum (HSA) was explored using absorption, fluorescence and circular dichroism (CD) spectroscopy in combination with in silico analyses. The MNS-HSA complexation was corroborated from the fluorescence and absorption spectral results. Implication of static quenching mechanism for MNS-HSA system was predicted from the Stern-Volmer constant, KSV-temperature relationship as well as the bimolecular quenching rate constant, kq values. Stabilization of the complex was affirmed by the value of the binding constant (Ka = 0.56-1.48 × 104 M-1). Thermodynamic data revealed that the MNS-HSA association was spontaneously driven mainly through hydrophobic interactions along with van der Waal's interaction and H-bonds. These results were well supported by in silico interpretations. Far-UV and near-UV CD spectral results manifested small variations in the protein's secondary and tertiary structures, respectively, while three-dimensional fluorescence spectra displayed microenvironmental fluctuations around protein's fluorophores, upon MNS binding. Significant improvement in the protein's thermostability was evident from the temperature-stability results of MNS-bound HSA. Binding locus of MNS, as identified by competitive drug displacement findings as well as in silico analysis, was found to be located in subdomain IIA (Sudlow's site I) of the protein.Communicated by Ramaswamy H. Sarma.
Collapse
Affiliation(s)
- Md Zahirul Kabir
- Faculty of Science, Biomolecular Research Group, Biochemistry Programme, Institute of Biological Sciences, University of Malaya, Kuala Lumpur, Malaysia
| | - Amira Adlin Roslan
- Faculty of Science, Biomolecular Research Group, Biochemistry Programme, Institute of Biological Sciences, University of Malaya, Kuala Lumpur, Malaysia
| | - Nor Farrah Wahidah Ridzwan
- Faculty of Science, Bioinformatics Programme, Institute of Biological Sciences, University of Malaya, Kuala Lumpur, Malaysia
| | - Saharuddin B Mohamad
- Faculty of Science, Bioinformatics Programme, Institute of Biological Sciences, University of Malaya, Kuala Lumpur, Malaysia.,Centre of Research for Computational Sciences and Informatics for Biology, Bioindustry, Environment, Agriculture and Healthcare, University of Malaya, Kuala Lumpur, Malaysia
| | - Saad Tayyab
- Faculty of Science, Biomolecular Research Group, Biochemistry Programme, Institute of Biological Sciences, University of Malaya, Kuala Lumpur, Malaysia.,Centre of Research for Computational Sciences and Informatics for Biology, Bioindustry, Environment, Agriculture and Healthcare, University of Malaya, Kuala Lumpur, Malaysia
| |
Collapse
|
12
|
Tayyab S, Sam SE, Kabir MZ, Ridzwan NFW, Mohamad SB. Molecular interaction study of an anticancer drug, ponatinib with human serum albumin using spectroscopic and molecular docking methods. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2019; 214:199-206. [PMID: 30780089 DOI: 10.1016/j.saa.2019.02.028] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2018] [Revised: 02/04/2019] [Accepted: 02/11/2019] [Indexed: 06/09/2023]
Abstract
Binding of a potent anticancer agent, ponatinib (PTB) to human serum albumin (HSA), main ligand transporter in blood plasma was analyzed with several spectral techniques such as fluorescence, absorption and circular dichroism along with molecular docking studies. Decrease in the KSV value with increasing temperature pointed towards PTB-induced quenching as the static quenching, thus affirming complexation between PTB and HSA. An intermediate binding affinity was found to stabilize the PTB-HSA complex, as suggested by the Ka value. Thermodynamic analysis of the binding phenomenon revealed participation of hydrophobic and van der Waals interactions along with hydrogen bonds, which was also supported by molecular docking analysis. Changes in both secondary and tertiary structures as well as in the microenvironment around Trp and Tyr residues of HSA were anticipated upon PTB binding to the protein, as manifested from circular dichroism and three-dimensional fluorescence spectra, respectively. Binding of PTB to HSA led to protein's thermal stabilization. Competitive ligand displacement experiments using different site markers such as warfarin, indomethacin and ketoprofen disclosed the binding site of PTB as Sudlow's site I in HSA, which was further confirmed by molecular docking analysis.
Collapse
Affiliation(s)
- Saad Tayyab
- Biomolecular Research Group, Biochemistry Programme, Institute of Biological Sciences, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia; Centre of Research for Computational Sciences and Informatics for Biology, Bioindustry, Environment, Agriculture and Healthcare, University of Malaya, Kuala Lumpur, Malaysia.
| | - Si Enn Sam
- Biomolecular Research Group, Biochemistry Programme, Institute of Biological Sciences, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia
| | - Md Zahirul Kabir
- Biomolecular Research Group, Biochemistry Programme, Institute of Biological Sciences, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia
| | - Nor Farrah Wahidah Ridzwan
- Bioinformatics Programme, Institute of Biological Sciences, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia
| | - Saharuddin B Mohamad
- Bioinformatics Programme, Institute of Biological Sciences, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia; Centre of Research for Computational Sciences and Informatics for Biology, Bioindustry, Environment, Agriculture and Healthcare, University of Malaya, Kuala Lumpur, Malaysia
| |
Collapse
|
13
|
Li Y, Liu B, Jiang L, Regenstein JM, Jiang N, Poias V, Zhang X, Qi B, Li A, Wang Z. Interaction of soybean protein isolate and phosphatidylcholine in nanoemulsions: A fluorescence analysis. Food Hydrocoll 2019. [DOI: 10.1016/j.foodhyd.2018.09.006] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
|
14
|
Mohos V, Fliszár-Nyúl E, Schilli G, Hetényi C, Lemli B, Kunsági-Máté S, Bognár B, Poór M. Interaction of Chrysin and Its Main Conjugated Metabolites Chrysin-7-Sulfate and Chrysin-7-Glucuronide with Serum Albumin. Int J Mol Sci 2018; 19:ijms19124073. [PMID: 30562928 PMCID: PMC6320863 DOI: 10.3390/ijms19124073] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2018] [Revised: 12/10/2018] [Accepted: 12/14/2018] [Indexed: 12/22/2022] Open
Abstract
Chrysin (5,7-dihydroxyflavone) is a flavonoid aglycone, which is found in nature and in several dietary supplements. During the biotransformation of chrysin, its conjugated metabolites chrysin-7-sulfate (C7S) and chrysin-7-glucuronide (C7G) are formed. Despite the fact that these conjugates appear in the circulation at much higher concentrations than chrysin, their interactions with serum albumin have not been reported. In this study, the complex formation of chrysin, C7S, and C7G with human (HSA) and bovine (BSA) serum albumins was investigated employing fluorescence spectroscopic, ultrafiltration, and modeling studies. Our major observations/conclusions are as follows: (1) Compared to chrysin, C7S binds with a threefold higher affinity to HSA, while C7G binds with a threefold lower affinity; (2) the albumin-binding of chrysin, C7S, and C7G did not show any large species differences regarding HSA and BSA; (3) tested flavonoids likely occupy Sudlow’s Site I in HSA; (4) C7S causes significant displacement of Sudlow’s Site I ligands, exerting an even stronger displacing ability than the parent compound chrysin. Considering the above-listed observations, the high intake of chrysin (e.g., through the consumption of dietary supplements with high chrysin contents) may interfere with the albumin-binding of several drugs, mainly due to the strong interaction of C7S with HSA.
Collapse
Affiliation(s)
- Violetta Mohos
- Department of Pharmacology, University of Pécs, Faculty of Pharmacy, Szigeti út 12, H-7624 Pécs, Hungary.
- János Szentágothai Research Center, University of Pécs, Ifjúság útja 20, H-7624 Pécs, Hungary.
| | - Eszter Fliszár-Nyúl
- Department of Pharmacology, University of Pécs, Faculty of Pharmacy, Szigeti út 12, H-7624 Pécs, Hungary.
| | - Gabriella Schilli
- Department of Pharmacology and Pharmacotherapy, University of Pécs, Medical School, Szigeti út 12, H-7624 Pécs, Hungary.
| | - Csaba Hetényi
- Department of Pharmacology and Pharmacotherapy, University of Pécs, Medical School, Szigeti út 12, H-7624 Pécs, Hungary.
| | - Beáta Lemli
- János Szentágothai Research Center, University of Pécs, Ifjúság útja 20, H-7624 Pécs, Hungary.
- Department of Pharmaceutical Chemistry, University of Pécs, Faculty of Pharmacy, Rókus utca 2, H-7624 Pécs, Hungary.
| | - Sándor Kunsági-Máté
- János Szentágothai Research Center, University of Pécs, Ifjúság útja 20, H-7624 Pécs, Hungary.
- Department of Pharmaceutical Chemistry, University of Pécs, Faculty of Pharmacy, Rókus utca 2, H-7624 Pécs, Hungary.
| | - Balázs Bognár
- Department of Organic and Pharmacological Chemistry, University of Pécs, Medical School, Honvéd utca 1, H-7624 Pécs, Hungary.
| | - Miklós Poór
- Department of Pharmacology, University of Pécs, Faculty of Pharmacy, Szigeti út 12, H-7624 Pécs, Hungary.
- János Szentágothai Research Center, University of Pécs, Ifjúság útja 20, H-7624 Pécs, Hungary.
| |
Collapse
|
15
|
Interaction of the mycotoxin metabolite dihydrocitrinone with serum albumin. Mycotoxin Res 2018; 35:129-139. [PMID: 30426325 DOI: 10.1007/s12550-018-0336-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2018] [Revised: 11/04/2018] [Accepted: 11/06/2018] [Indexed: 01/30/2023]
Abstract
Citrinin (CIT) is a nephrotoxic mycotoxin produced by Penicillium, Monascus, and Aspergillus species. CIT appears as a contaminant in cereals, cereal-based products, fruits, nuts, and spices. During the biotransformation of CIT, its major urinary metabolite dihydrocitrinone (DHC) is formed. Albumin interacts with several compounds (including mycotoxins) affecting their tissue distribution and elimination. CIT-albumin interaction is known; however, the complex formation of DHC with albumin has not been reported previously. In this study, we aimed to investigate the interaction of DHC with albumin, employing fluorescence spectroscopy, circular dichroism, and molecular modeling studies. Furthermore, species differences and thermodynamics of the interaction as well as the effects of albumin on the acute in vitro toxicity of DHC and CIT were also tested. Our main observations/conclusions are as follows: (1) Fluorescence signal of DHC is strongly enhanced by albumin. (2) Formation of DHC-albumin complexes is supported by both fluorescence spectroscopic and circular dichroism studies. (3) DHC forms similarly stable complexes with human albumin (K~105 L/mol) as CIT. (4) DHC-albumin interaction did not show significant species differences (tested with human, bovine, porcine, and rat albumins). (5) Based on modeling studies and investigations with site markers, DHC occupies the Heme binding site (subdomain IB) on human albumin. (6) The presence of albumin significantly decreased the acute in vitro cytotoxic effects of both DHC and CIT on MDCK cell line.
Collapse
|
16
|
Interaction of 2'R-ochratoxin A with Serum Albumins: Binding Site, Effects of Site Markers, Thermodynamics, Species Differences of Albumin-binding, and Influence of Albumin on Its Toxicity in MDCK Cells. Toxins (Basel) 2018; 10:toxins10090353. [PMID: 30200461 PMCID: PMC6162703 DOI: 10.3390/toxins10090353] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2018] [Revised: 08/17/2018] [Accepted: 08/27/2018] [Indexed: 01/02/2023] Open
Abstract
Ochratoxin A (OTA) is a nephrotoxic mycotoxin. Roasting of OTA-contaminated coffee results in the formation of 2′R-ochratoxin A (2′R-OTA), which appears in the blood of coffee drinkers. Human serum albumin (HSA) binds 2′R-OTA (and OTA) with high affinity; therefore, albumin may influence the tissue uptake and elimination of ochratoxins. We aimed to investigate the binding site of 2′R-OTA (verses OTA) in HSA and the displacing effects of site markers to explore which molecules can interfere with its albumin-binding. Affinity of 2′R-OTA toward albumins from various species (human, bovine, porcine and rat) was tested to evaluate the interspecies differences regarding 2′R-OTA-albumin interaction. Thermodynamic studies were performed to give a deeper insight into the molecular background of the complex formation. Besides fluorescence spectroscopic and modeling studies, effects of HSA, and fetal bovine serum on the cytotoxicity of 2′R-OTA and OTA were tested in MDCK kidney cell line in order to demonstrate the influence of albumin-binding on the cellular uptake of ochratoxins. Site markers displaced more effectively 2′R-OTA than OTA from HSA. Fluorescence and binding constants of 2′R-OTA-albumin and OTA-albumin complexes showed different tendencies. Albumin significantly decreased the cytotoxicity of ochratoxins. 2′R-OTA, even at sub-toxic concentrations, increased the toxic action of OTA.
Collapse
|
17
|
Poór M, Kunsági-Máté S, Bálint M, Hetényi C, Gerner Z, Lemli B. Interaction of mycotoxin zearalenone with human serum albumin. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2017; 170:16-24. [PMID: 28365492 DOI: 10.1016/j.jphotobiol.2017.03.016] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2016] [Revised: 03/19/2017] [Accepted: 03/21/2017] [Indexed: 01/05/2023]
Abstract
Zearalenone (ZEN) is a mycotoxin produced mainly by Fusarium species. Fungal contamination of cereals and plants can result in the formation of ZEN, leading to its presence in different foods, animal feeds, and drinks. Because ZEN is an endocrine disruptor, it causes reproductive disorders in farm animals and hyperoestrogenic syndromes in humans. Despite toxicokinetic properties of ZEN were studied in more species, we have no information regarding the interaction of ZEN with serum albumin. Since albumin commonly plays an important role in the toxicokinetics of different toxins, interaction of ZEN with albumin has of high biological importance. Therefore the interaction of ZEN with human serum albumin (HSA) was investigated using spectroscopic methods, ultrafiltration, and molecular modeling studies. Fluorescence spectroscopic studies demonstrate that ZEN forms complex with HSA. Binding constant (K) of ZEN-HSA complex was quantified with fluorescence quenching technique. The determined binding constant (logK=5.1) reflects the strong interaction of ZEN with albumin suggesting the potential biological importance of ZEN-HSA complex formation. Based on the results of the investigations with site markers as well as docking studies, ZEN occupies a non-conventional binding site on HSA. Considering the above listed observations, we should keep in mind this interaction if we would like to precisely understand the toxicokinetic behavior of ZEN.
Collapse
Affiliation(s)
- Miklós Poór
- Department of Pharmacology, University of Pécs, Faculty of Pharmacy, Szigeti út 12, Pécs H-7624, Hungary; Department of Pharmacology and Pharmacotherapy, University of Pécs, Medical School, Szigeti út 12, Pécs H-7624, Hungary.
| | - Sándor Kunsági-Máté
- Department of General and Physical Chemistry, University of Pécs, Ifjúság útja 6, Pécs H-7624, Hungary; János Szentágothai Research Center, Ifjúság útja 20, Pécs H-7624, Hungary
| | - Mónika Bálint
- Department of Pharmacology and Pharmacotherapy, University of Pécs, Medical School, Szigeti út 12, Pécs H-7624, Hungary; Department of Biochemistry, Eötvös Loránd University, Pázmány sétány 1/C, Budapest H-1117, Hungary
| | - Csaba Hetényi
- Department of Pharmacology and Pharmacotherapy, University of Pécs, Medical School, Szigeti út 12, Pécs H-7624, Hungary; MTA-ELTE Molecular Biophysics Research Group, Hungarian Academy of Sciences, Pázmány sétány 1/C, Budapest H-1117, Hungary
| | - Zsófia Gerner
- Department of General and Physical Chemistry, University of Pécs, Ifjúság útja 6, Pécs H-7624, Hungary
| | - Beáta Lemli
- Department of General and Physical Chemistry, University of Pécs, Ifjúság útja 6, Pécs H-7624, Hungary; János Szentágothai Research Center, Ifjúság útja 20, Pécs H-7624, Hungary
| |
Collapse
|
18
|
Kumar P, Kumar V, Gupta R. Detection of the anticoagulant drug warfarin by palladium complexes. Dalton Trans 2017; 46:10205-10209. [DOI: 10.1039/c7dt01811h] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
This work illustrates the application of palladium complexes in the significant sensing of warfarin, a commercial anticoagulant drug, not only in organic solvents but also in aqueous medium.
Collapse
Affiliation(s)
- Pramod Kumar
- Department of Chemistry
- University of Delhi
- Delhi 110 007
- India
| | - Vijay Kumar
- Department of Chemistry
- University of Delhi
- Delhi 110 007
- India
| | - Rajeev Gupta
- Department of Chemistry
- University of Delhi
- Delhi 110 007
- India
| |
Collapse
|
19
|
Ochratoxin A: Molecular Interactions, Mechanisms of Toxicity and Prevention at the Molecular Level. Toxins (Basel) 2016; 8:111. [PMID: 27092524 PMCID: PMC4848637 DOI: 10.3390/toxins8040111] [Citation(s) in RCA: 171] [Impact Index Per Article: 21.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2016] [Revised: 03/31/2016] [Accepted: 04/06/2016] [Indexed: 01/28/2023] Open
Abstract
Ochratoxin A (OTA) is a widely-spread mycotoxin all over the world causing major health risks. The focus of the present review is on the molecular and cellular interactions of OTA. In order to get better insight into the mechanism of its toxicity and on the several attempts made for prevention or attenuation of its toxic action, a detailed description is given on chemistry and toxicokinetics of this mycotoxin. The mode of action of OTA is not clearly understood yet, and seems to be very complex. Inhibition of protein synthesis and energy production, induction of oxidative stress, DNA adduct formation, as well as apoptosis/necrosis and cell cycle arrest are possibly involved in its toxic action. Since OTA binds very strongly to human and animal albumin, a major emphasis is done regarding OTA-albumin interaction. Displacement of OTA from albumin by drugs and by natural flavonoids are discussed in detail, hypothesizing their potentially beneficial effect in order to prevent or attenuate the OTA-induced toxic consequences.
Collapse
|
20
|
Kabir MZ, Tee WV, Mohamad SB, Alias Z, Tayyab S. Interaction of an anticancer drug, gefitinib with human serum albumin: insights from fluorescence spectroscopy and computational modeling analysis. RSC Adv 2016. [DOI: 10.1039/c6ra12019a] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Binding orientation of the GEF in the binding site III, located in subdomain IB of HSA.
Collapse
Affiliation(s)
- Md. Zahirul Kabir
- Biomolecular Research Group
- Biochemistry Programme
- Institute of Biological Sciences
- Faculty of Science
- University of Malaya
| | - Wei-Ven Tee
- Bioinformatics Programme
- Institute of Biological Sciences
- Faculty of Science
- University of Malaya
- Kuala Lumpur
| | - Saharuddin B. Mohamad
- Bioinformatics Programme
- Institute of Biological Sciences
- Faculty of Science
- University of Malaya
- Kuala Lumpur
| | - Zazali Alias
- Biomolecular Research Group
- Biochemistry Programme
- Institute of Biological Sciences
- Faculty of Science
- University of Malaya
| | - Saad Tayyab
- Biomolecular Research Group
- Biochemistry Programme
- Institute of Biological Sciences
- Faculty of Science
- University of Malaya
| |
Collapse
|
21
|
Poór M, Lemli B, Bálint M, Hetényi C, Sali N, Kőszegi T, Kunsági-Máté S. Interaction of Citrinin with Human Serum Albumin. Toxins (Basel) 2015; 7:5155-66. [PMID: 26633504 PMCID: PMC4690121 DOI: 10.3390/toxins7124871] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2015] [Revised: 11/22/2015] [Accepted: 11/25/2015] [Indexed: 12/25/2022] Open
Abstract
Citrinin (CIT) is a mycotoxin produced by several Aspergillus, Penicillium, and Monascus species. CIT occurs worldwide in different foods and drinks and causes health problems for humans and animals. Human serum albumin (HSA) is the most abundant plasma protein in human circulation. Albumin forms stable complexes with many drugs and xenobiotics; therefore, HSA commonly plays important role in the pharmacokinetics or toxicokinetics of numerous compounds. However, the interaction of CIT with HSA is poorly characterized yet. In this study, the complex formation of CIT with HSA was investigated using fluorescence spectroscopy and ultrafiltration techniques. For the deeper understanding of the interaction, thermodynamic, and molecular modeling studies were performed as well. Our results suggest that CIT forms stable complex with HSA (logK ~ 5.3) and its primary binding site is located in subdomain IIA (Sudlow’s Site I). In vitro cell experiments also recommend that CIT-HSA interaction may have biological relevance. Finally, the complex formations of CIT with bovine, porcine, and rat serum albumin were investigated, in order to test the potential species differences of CIT-albumin interactions.
Collapse
Affiliation(s)
- Miklós Poór
- Department of Pharmacology and Pharmacotherapy, Toxicology Section, University of Pécs, Szigeti út 12, Pécs H-7624, Hungary.
| | - Beáta Lemli
- Department of General and Physical Chemistry, University of Pécs, Ifjúság útja 6, Pécs H-7624, Hungary.
- János Szentágothai Research Center, Ifjúság útja 20, Pécs H-7624, Hungary.
| | - Mónika Bálint
- Department of Biochemistry, Eötvös Loránd University, Pázmány sétány 1/C, Budapest 1117, Hungary.
| | - Csaba Hetényi
- MTA-ELTE Molecular Biophysics Research Group, Hungarian Academy of Sciences, Pázmány sétány 1/C, Budapest 1117, Hungary.
| | - Nikolett Sali
- János Szentágothai Research Center, Ifjúság útja 20, Pécs H-7624, Hungary.
- Department of Laboratory Medicine, University of Pécs, Ifjúság útja 13, Pécs H-7624, Hungary.
| | - Tamás Kőszegi
- János Szentágothai Research Center, Ifjúság útja 20, Pécs H-7624, Hungary.
- Department of Laboratory Medicine, University of Pécs, Ifjúság útja 13, Pécs H-7624, Hungary.
| | - Sándor Kunsági-Máté
- Department of General and Physical Chemistry, University of Pécs, Ifjúság útja 6, Pécs H-7624, Hungary.
- János Szentágothai Research Center, Ifjúság útja 20, Pécs H-7624, Hungary.
| |
Collapse
|
22
|
Chakraborty B, Mitra P, Basu S. Spectroscopic exploration of drug–protein interaction: a study highlighting the dependence of the magnetic field effect on inter-radical separation distance formed during photoinduced electron transfer. RSC Adv 2015. [DOI: 10.1039/c5ra13575c] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The magnetic field effect can be used as a “spectroscopic ruler” to assess inter-radical separation distances in photoinduced electron transfer.
Collapse
Affiliation(s)
| | - Piyali Mitra
- Chemical Sciences Division
- Saha Institute of Nuclear Physics
- Kolkata
- India
| | - Samita Basu
- Chemical Sciences Division
- Saha Institute of Nuclear Physics
- Kolkata
- India
| |
Collapse
|
23
|
De D, Kaur H, Datta A. Unusual Binding of a Potential Biomarker with Human Serum Albumin. Chem Asian J 2013; 8:728-35. [DOI: 10.1002/asia.201201060] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2012] [Indexed: 11/10/2022]
|
24
|
Abou-Zied OK, Al-Lawatia N, Elstner M, Steinbrecher TB. Binding of Hydroxyquinoline Probes to Human Serum Albumin: Combining Molecular Modeling and Förster’s Resonance Energy Transfer Spectroscopy to Understand Flexible Ligand Binding. J Phys Chem B 2013; 117:1062-74. [DOI: 10.1021/jp311238n] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Osama K. Abou-Zied
- Department of Chemistry, Faculty
of Science, Sultan Qaboos University, P.O.
Box 36, Postal Code 123, Muscat, Sultanate of Oman
| | - Najla Al-Lawatia
- Department of Chemistry, Faculty
of Science, Sultan Qaboos University, P.O.
Box 36, Postal Code 123, Muscat, Sultanate of Oman
| | - Marcus Elstner
- Department for Theoretical Chemical
Biology, Institute for Physical Chemistry, Kaiserstr. 12, Karlsruhe Institute of Technology, 76131 Karlsruhe,
Germany
| | - Thomas B. Steinbrecher
- Department for Theoretical Chemical
Biology, Institute for Physical Chemistry, Kaiserstr. 12, Karlsruhe Institute of Technology, 76131 Karlsruhe,
Germany
| |
Collapse
|
25
|
Vayá I, Bonancía P, Jiménez MC, Markovitsi D, Gustavsson T, Miranda MA. Excited state interactions between flurbiprofen and tryptophan in drug–protein complexes and in model dyads. Fluorescence studies from the femtosecond to the nanosecond time domains. Phys Chem Chem Phys 2013; 15:4727-34. [DOI: 10.1039/c3cp43847c] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
26
|
Abou-Zied OK. Spectroscopy of hydroxyphenyl benzazoles in solution and human serum albumin: detecting flexibility, specificity and high affinity of the warfarin drug binding site. RSC Adv 2013. [DOI: 10.1039/c3ra40907d] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
|
27
|
Poór M, Kunsági-Máté S, Czibulya Z, Li Y, Peles-Lemli B, Petrik J, Vladimir-Knežević S, Kőszegi T. Fluorescence spectroscopic investigation of competitive interactions between ochratoxin A and 13 drug molecules for binding to human serum albumin. LUMINESCENCE 2012; 28:726-33. [PMID: 22987806 DOI: 10.1002/bio.2423] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2012] [Revised: 07/13/2012] [Accepted: 07/19/2012] [Indexed: 11/11/2022]
Abstract
Ochratoxin A (OTA) is a highly toxic mycotoxin found worldwide in cereals, foods, animal feeds and different drinks. Based on previous studies, OTA is one of the major causes of the chronic tubulointerstitial nephropathy known as Balkan endemic nephropathy (BEN) and exerts several other adverse effects shown by cell and/or animal models. It is a well-known fact that OTA binds to various albumins with very high affinity. Recently, a few studies suggested that reducing the bound fraction of OTA might reduce its toxicity. Hypothetically, certain drugs can be effective competitors displacing OTA from its albumin complex. Therefore, we examined 13 different drug molecules to determine their competing abilities to displace OTA from human serum albumin (HSA). Competitors and ineffective chemicals were identified with a steady-state fluorescence polarization-based method. After characterization the competitive abilities of individual drugs, drug pairs were formed and their displacing activity were tested in OTA-HSA system. Indometacin, phenylbutazone, warfarin and furosemide showed the highest competing capacity but ibuprofen, glipizide and simvastatin represented detectable interaction too. Investigations of drug pairs raised the possibility of the presence of diverse binding sites of competing drugs. Apart from the chemical information obtained in our model, this explorative research might initiate future designs for epidemiologic studies to gain further in vivo evidence of long-term (potentially protective) effects of competing drugs administered to human patients.
Collapse
Affiliation(s)
- Miklós Poór
- Institute of Laboratory Medicine, University of Pécs, H-7624, Pécs, Hungary
| | | | | | | | | | | | | | | |
Collapse
|
28
|
Zhao XN, Liu Y, Niu LY, Zhao CP. Spectroscopic studies on the interaction of bovine serum albumin with surfactants and apigenin. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2012; 94:357-364. [PMID: 22561754 DOI: 10.1016/j.saa.2012.02.078] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2011] [Revised: 02/16/2012] [Accepted: 02/22/2012] [Indexed: 05/31/2023]
Abstract
The binding of apigenin (Ap) to bovine serum albumin (BSA) has been studied using the methods of fluorescence spectroscopy and UV-vis absorption spectroscopy. The spectroscopic analysis of the quenching mechanism indicates that the quenching constants are inversely correlated with the temperatures and the quenching process could result from a static interaction. The type of interaction force was discussed and the binding site of Ap was in site I (subdomain IIA) of BSA. The thermodynamic parameters ΔH and ΔS are -42.02kJ mol(-1) and -48.31J mol(-1)K(-1), respectively and the negative ΔG implying that the binding interaction was spontaneous. The distance r between BSA and Ap was calculated according to Förster's theory and the value is 3.44nm. The synchronous and three-dimensional fluorescence spectra show that the binding of Ap to BSA could lead to the changes in the conformation and microenvironment of BSA. At the same time, the effects of ionic surfactants on the interaction of Ap and BSA have also been investigated.
Collapse
Affiliation(s)
- Xu-Na Zhao
- Experimental Center, Henan Institute of Science and Technology, Xinxiang 453003, PR China
| | | | | | | |
Collapse
|
29
|
Flavonoid aglycones can compete with Ochratoxin A for human serum albumin: a new possible mode of action. Int J Biol Macromol 2012; 51:279-83. [PMID: 22634515 DOI: 10.1016/j.ijbiomac.2012.05.019] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2012] [Revised: 05/14/2012] [Accepted: 05/15/2012] [Indexed: 11/22/2022]
Abstract
The mycotoxin Ochratoxin A (OTA) appears worldwide in cereals, plant products, different foods and drinks. Ochratoxin A binds to plasma albumin with a very high affinity. However, it is well known that natural flavonoids can also bind to human serum albumin (HSA) at the same binding site as OTA does (site I, subdomain IIA). A few experimental literature data suggest that reducing the bound fraction of OTA speeds up its elimination rate with a potential decrease in its toxicity. In our experimental model competitive binding properties of flavonoid aglycones were examined with a fluorescence polarization based approach. Our data show that some of the flavonoids are able to remove the toxin from HSA. We conclude that among the 13 studied flavonoid aglycones galangin and quercetin were the most effective competitors for OTA.
Collapse
|
30
|
Khan AY, Hossain M, Suresh Kumar G. Investigations on the interaction of the phototoxic alkaloid coralyne with serum albumins. CHEMOSPHERE 2012; 87:775-781. [PMID: 22305193 DOI: 10.1016/j.chemosphere.2011.12.079] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2011] [Revised: 12/14/2011] [Accepted: 12/30/2011] [Indexed: 05/31/2023]
Abstract
The interaction of the phototoxic alkaloid coralyne with bovine and human serum albumins (BSA, HSA) was investigated. Absorbance and fluorescence quenching experiments revealed the formation of strong complexes. Based on the binding parameters calculated from Stern-Volmer quenching method, coralyne has higher affinity to BSA (~10(5) M(-1)) compared to HSA (~10(4) M(-1)). Forster resonance energy transfer studies showed that the specific binding distances between Trp (donor) of the proteins and coralyne (acceptor) were 2.95 and 3.10 nm, respectively. The bindings were favored by negative enthalpy and a stronger favorable entropy contribution. The heat capacity values for binding to BSA and HSA were similar, indicating the involvement of similar molecular forces in the complexation. Competitive binding experiments using site markers demonstrated that coralyne binds to site I (subdomain IIA) of both proteins. The secondary structure of the proteins was altered, suggesting a small but definitive partial unfolding on complexation.
Collapse
Affiliation(s)
- Asma Yasmeen Khan
- Biophysical Chemistry Laboratory, CSIR-Indian Institute of Chemical Biology, Kolkata 700 032, India
| | | | | |
Collapse
|
31
|
Carmona NA, Cohen B, Organero JA, Douhal A. Excited state intermolecular proton and energy transfer of 1-hydroxypyrene interacting with the human serum albumin protein. J Photochem Photobiol A Chem 2012. [DOI: 10.1016/j.jphotochem.2011.10.024] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
32
|
Li T, Jo EJ, Kim MG. A label-free fluorescence immunoassay system for the sensitive detection of the mycotoxin, ochratoxin A. Chem Commun (Camb) 2012; 48:2304-6. [DOI: 10.1039/c2cc17088d] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
33
|
Guo Z, Ren J, Wang J, Wang E. Single-walled carbon nanotubes based quenching of free FAM-aptamer for selective determination of ochratoxin A. Talanta 2011; 85:2517-21. [PMID: 21962677 DOI: 10.1016/j.talanta.2011.08.015] [Citation(s) in RCA: 123] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2011] [Revised: 07/30/2011] [Accepted: 08/04/2011] [Indexed: 11/19/2022]
Abstract
Ochratoxin A, a toxin produced by Aspergillus ochraceus and Penicillium verrucosum, is one of the most abundant food-contaminating mycotoxins in the world. It has been classified by the International Agency for Research on Cancer (IARC) as a possible human carcinogen. In this paper, a sensitive and selective fluorescent aptasensor for ochratoxin A (OTA) detection was constructed, utilizing single-walled carbon nanotubes (SWNTs) as quencher which can quench the fluorescence of free unfolded toxin-specific aptamer attached with FAM (carboxyfluorescein). Without any coating materials as compared to graphene-oxide based sensor, we obtained the detection limit of our sensing platform based on SWNTs to be 24.1 nM with a linear detection range from 25 nM to 200 nM. This technique responded specifically to OTA without interference from other analogues (N-acetyl-L-phenylalanine, warfarin and OTB). It has also been verified for real sample application by testing 1% beer containing buffer solution spiked with a series of concentration of OTA.
Collapse
Affiliation(s)
- Zhijun Guo
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, China
| | | | | | | |
Collapse
|
34
|
Application of molecular modelling and spectroscopic approaches for investigating binding of vanillin to human serum albumin. Food Chem 2011; 127:705-10. [DOI: 10.1016/j.foodchem.2010.12.128] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2010] [Revised: 10/31/2010] [Accepted: 12/31/2010] [Indexed: 11/21/2022]
|
35
|
Monti S, Manet I, Marconi G. Combination of spectroscopic and computational methods to get an understanding of supramolecular chemistry of drugs: from simple host systems to biomolecules. Phys Chem Chem Phys 2011; 13:20893-905. [DOI: 10.1039/c1cp21992h] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
36
|
Nicholls IA, Karlsson BCG, Rosengren AM, Henschel H. Warfarin: an environment-dependent switchable molecular probe. J Mol Recognit 2010; 23:604-8. [DOI: 10.1002/jmr.1058] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
37
|
Darwish SM, Abu sharkh SE, Abu Teir MM, Makharza SA, Abu-hadid MM. Spectroscopic investigations of pentobarbital interaction with human serum albumin. J Mol Struct 2010. [DOI: 10.1016/j.molstruc.2009.10.023] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
38
|
Zhang XF, Xie L, Liu Y, Xiang JF, Tang YL. Binding of the bioactive component Aloe dihydroisocoumarin with human serum albumin. J Mol Struct 2008. [DOI: 10.1016/j.molstruc.2008.03.005] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
39
|
Investigation of the interaction between sophoricoside and human serum albumin by optical spectroscopy and molecular modeling methods. J Mol Struct 2008. [DOI: 10.1016/j.molstruc.2008.02.031] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
40
|
Zhang XF, Xie L, Liu Y, Xiang JF, Li L, Tang YL. Molecular interaction and energy transfer between human serum albumin and bioactive component Aloe dihydrocoumarin. J Mol Struct 2008. [DOI: 10.1016/j.molstruc.2007.11.051] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
41
|
Qi ZD, Zhou B, Qi X, Chuan S, Liu Y, Dai J. Interaction of rofecoxib with human serum albumin: Determination of binding constants and the binding site by spectroscopic methods. J Photochem Photobiol A Chem 2008. [DOI: 10.1016/j.jphotochem.2007.06.011] [Citation(s) in RCA: 89] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
42
|
McCarty TA, Page PM, Baker GA, Bright FV. Behavior of Acrylodan-Labeled Human Serum Albumin Dissolved in Ionic Liquids. Ind Eng Chem Res 2007. [DOI: 10.1021/ie071165k] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Taylor A. McCarty
- Department of Chemistry, Natural Sciences Complex, University at Buffalo, The State University of New York, Buffalo, New York 14260-3000, and Chemical Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831-6110
| | - Phillip M. Page
- Department of Chemistry, Natural Sciences Complex, University at Buffalo, The State University of New York, Buffalo, New York 14260-3000, and Chemical Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831-6110
| | - Gary A. Baker
- Department of Chemistry, Natural Sciences Complex, University at Buffalo, The State University of New York, Buffalo, New York 14260-3000, and Chemical Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831-6110
| | - Frank V. Bright
- Department of Chemistry, Natural Sciences Complex, University at Buffalo, The State University of New York, Buffalo, New York 14260-3000, and Chemical Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831-6110
| |
Collapse
|
43
|
Liu T, Guo R. Effects of Triton X-100 and Acyclovir on Human Serum Albumin Structure. J SURFACTANTS DETERG 2007. [DOI: 10.1007/s11743-007-1051-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
44
|
Pastukhov AV, Levchenko LA, Sadkov AP. Spectroscopic study on binding of rutin to human serum albumin. J Mol Struct 2007. [DOI: 10.1016/j.molstruc.2006.12.008] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
45
|
Patel S, Datta A. Steady State and Time-resolved Fluorescence Investigation of the Specific Binding of Two Chlorin Derivatives with Human Serum Albumin. J Phys Chem B 2007; 111:10557-62. [PMID: 17705527 DOI: 10.1021/jp072544u] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The specific binding of two model drugs for photodynamic therapy, namely chlorin p6 and purpurin 18 in the vicinity of Sudlow's Site I of HSA has been investigated by monitoring the intrinsic fluorescence of single tryptophanyl residue and by competitive binding with warfarin. The distance from the tryptophanyl residue has been ascertained by FRET from Trp to the chlorins and has been found to indicate a binding to Sudlow's Site I. The principal driving force for the interaction is found to be the hydrophobic effect. The main mechanism of protein fluorescence quenching was static. Time-resolved fluorescence results of competitive binding with warfarin are found to confirm that they bind to the warfarin binding site.
Collapse
Affiliation(s)
- Sunita Patel
- Department of Chemistry, Indian Institute of Technology, Bombay, Powai, Mumbai 400 076, India
| | | |
Collapse
|
46
|
Hong CY, Chen YC. Selective enrichment of ochratoxin A using human serum albumin bound magnetic beads as the concentrating probes for capillary electrophoresis/electrospray ionization-mass spectrometric analysis. J Chromatogr A 2007; 1159:250-5. [PMID: 17537446 DOI: 10.1016/j.chroma.2007.05.026] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2006] [Revised: 05/06/2007] [Accepted: 05/09/2007] [Indexed: 11/20/2022]
Abstract
Ochratoxin A (OTA) is a toxicant commonly present in many food products. Conventionally, immuno-affinity analysis is applied to rapidly screen the presence of OTA in food. However, antibodies are expensive. In this study, we present a new approach for selectively enriching OTA from aqueous samples using human serum albumin (HSA) bound magnetic beads as the affinity probes, followed by the analysis of CE/ESI-MS. In addition to demonstrating the feasibility of using the affinity probes to concentrate OTA, we also propose a rapid concentration and elution method for extraction, that is, OTA are extracted from aqueous samples by pipetting the samples in and out of a sample vial for 1 min followed by elution with pipetting for another minute. On the basis of the magnetic property, the affinity magnetic probe-target species could be rapidly isolated from the solution during the process of extraction and elution by magnetic separation. CE/ESI-MS, coupled by the electrodeless/sheathless interface, is used for the analysis of the samples. As this method features speed and cost-effectiveness, it is suitable for the purpose of rapid screening. In fact, the lowest detection limit for OTA is approximately 4 x 10(-3) mg/L.
Collapse
Affiliation(s)
- Chen-Yu Hong
- Department of Applied Chemistry, National Chiao Tung University, Hsinchu 300, Taiwan
| | | |
Collapse
|
47
|
Brow ME, Dai J, Park G, Wright MW, Gillman IG, Manderville RA. Photochemically Catalyzed Reaction of Ochratoxin A with d- and l-cysteine¶. Photochem Photobiol 2007. [DOI: 10.1562/0031-8655(2002)0760649pcrooa2.0.co2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
48
|
Artali R, Bombieri G, Calabi L, Del Pra A. A molecular dynamics study of human serum albumin binding sites. ACTA ACUST UNITED AC 2006; 60:485-95. [PMID: 15950224 DOI: 10.1016/j.farmac.2005.04.010] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2005] [Accepted: 04/04/2005] [Indexed: 11/22/2022]
Abstract
A 2.0 ns unrestrained Molecular Dynamics was used to elucidate the geometric and dynamic properties of the HSA binding sites. The structure is not stress affected and the rmsds calculated from the published crystallographic data are almost constant for all the simulation time, with an averaged value of 2.4A. The major variability is in the C-terminus region. The trajectory analysis of the IIA binding site put in evidence fast oscillations for the Cgamma@Leu203...Cgamma@Leu275 and Cgamma@Leu219...Cgamma@Leu260 distances, with fluctuations around 250 ps, 1000 ps and over for the first, while the second is smoothly increasing with the simulation time from 7 to 10A. These variations are consistent with a volume increase up to 20% confirmed by the inter-domain contacts analysis, in particular for the pair O@Pro148...Ogamma@Ser283, representing the change of distance between IB-h9 and IIA-h6, O@Glu149...Ogamma@Ser189 for sub-domains IB-h9/IIA-h1 and N@Val339...Odelta2@Asp447 sub-domains IIB-h9/IIIA-h1. These inter-domain motions confirm the flexibility of the unfatted HSA with possible binding site pre-formation.
Collapse
Affiliation(s)
- Roberto Artali
- Istituto di Chimica Farmaceutica e Tossicologica, Università di Milano, Viale Abruzzi 42, 20131 Milano, Italy.
| | | | | | | |
Collapse
|
49
|
Perry JL, Goldsmith MR, Peterson MA, Beratan DN, Wozniak G, Rüker F, Simon JD. Structure of the Ochratoxin A Binding Site within Human Serum Albumin. J Phys Chem B 2004. [DOI: 10.1021/jp0480652] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Jennifer L. Perry
- Laboratory of Pharmacology and Chemistry, NIEHS, Research Triangle Park, North Carolina 27709, Department of Chemistry, Duke University, Durham, North Carolina 27708, Department of Biochemistry, Duke University Medical Center, Durham, North Carolina 27710, and Institute of Applied Microbiology, BOKU-University of Natural Resources and Applied Life Sciences, Muthgasse 18, A-1190 Vienna, Austria
| | - Michael R. Goldsmith
- Laboratory of Pharmacology and Chemistry, NIEHS, Research Triangle Park, North Carolina 27709, Department of Chemistry, Duke University, Durham, North Carolina 27708, Department of Biochemistry, Duke University Medical Center, Durham, North Carolina 27710, and Institute of Applied Microbiology, BOKU-University of Natural Resources and Applied Life Sciences, Muthgasse 18, A-1190 Vienna, Austria
| | - Michael A. Peterson
- Laboratory of Pharmacology and Chemistry, NIEHS, Research Triangle Park, North Carolina 27709, Department of Chemistry, Duke University, Durham, North Carolina 27708, Department of Biochemistry, Duke University Medical Center, Durham, North Carolina 27710, and Institute of Applied Microbiology, BOKU-University of Natural Resources and Applied Life Sciences, Muthgasse 18, A-1190 Vienna, Austria
| | - David N. Beratan
- Laboratory of Pharmacology and Chemistry, NIEHS, Research Triangle Park, North Carolina 27709, Department of Chemistry, Duke University, Durham, North Carolina 27708, Department of Biochemistry, Duke University Medical Center, Durham, North Carolina 27710, and Institute of Applied Microbiology, BOKU-University of Natural Resources and Applied Life Sciences, Muthgasse 18, A-1190 Vienna, Austria
| | - Gordana Wozniak
- Laboratory of Pharmacology and Chemistry, NIEHS, Research Triangle Park, North Carolina 27709, Department of Chemistry, Duke University, Durham, North Carolina 27708, Department of Biochemistry, Duke University Medical Center, Durham, North Carolina 27710, and Institute of Applied Microbiology, BOKU-University of Natural Resources and Applied Life Sciences, Muthgasse 18, A-1190 Vienna, Austria
| | - Florian Rüker
- Laboratory of Pharmacology and Chemistry, NIEHS, Research Triangle Park, North Carolina 27709, Department of Chemistry, Duke University, Durham, North Carolina 27708, Department of Biochemistry, Duke University Medical Center, Durham, North Carolina 27710, and Institute of Applied Microbiology, BOKU-University of Natural Resources and Applied Life Sciences, Muthgasse 18, A-1190 Vienna, Austria
| | - John D. Simon
- Laboratory of Pharmacology and Chemistry, NIEHS, Research Triangle Park, North Carolina 27709, Department of Chemistry, Duke University, Durham, North Carolina 27708, Department of Biochemistry, Duke University Medical Center, Durham, North Carolina 27710, and Institute of Applied Microbiology, BOKU-University of Natural Resources and Applied Life Sciences, Muthgasse 18, A-1190 Vienna, Austria
| |
Collapse
|
50
|
Brow ME, Dai J, Park G, Wright MW, Gillman IG, Manderville RA. Photochemically catalyzed reaction of ochratoxin A with D- and L-cysteine. Photochem Photobiol 2002; 76:649-56. [PMID: 12511045 DOI: 10.1562/0031-8655(2002)076<0649:pcrooa>2.0.co;2] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The photolysis (>300 nm) of ochratoxin A (OTA, N-[[(3R)-5-chloro-8-hydroxy-3-methyl-1-oxo-7-isochromanyl]carbonyl]-3-phenyl-L-alanine, 1) in the presence of excess (2 and 12 molar equiv) cysteine (CySH) has been investigated and found to yield sulfur adducts 5 and 6 that are characterized by liquid chromatography-mass spectrometry and 1H-NMR spectroscopy. The adduct 5 was ascribed to the Michael addition conjugate resulting from covalent attachment of CySH to the ochratoxin quinone (4) generated by photooxidation of OTA. This species was also formed by photolysis of a synthetic sample of the hydroquinone of OTA (ochratoxin hydroquinone, 3) in the presence of 12 equiv L-CySH. The conjugate 5 derived from photolysis of 3 with L-CySH was used for 1H-NMR analysis. The sulfur adduct 6 was the major species detected from covalent attachment of CySH to photoactivated OTA, and it resulted from direct displacement of the OTA Cl atom by CySH. The implications of the cysteinyl adducts to the in vivo toxicity of OTA are discussed, with particular emphasis given to conjugate 5, as products from the photooxidative pathway may be of relevance to the nephrotoxic properties of OTA.
Collapse
Affiliation(s)
- Mark E Brow
- Department of Chemistry, Wake Forest University, Winston-Salem, NC 27109-7486, USA
| | | | | | | | | | | |
Collapse
|