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Fateminasab F, Bordbar AK, Shityakov S, Saboury AA. Comprehensive Physico-Chemical Characterization of a Serotonin Inclusion Complex with 2-Hydroxypropyl-β-Cyclodextrin. J SOLUTION CHEM 2020. [DOI: 10.1007/s10953-020-00997-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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2
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Abstract
Adenosine deaminase is a critical enzyme in purine metabolism that regulates intra and extracellular adenosine concentrations by converting it to inosine. Adenosine is an important purine that regulates numerous physiological functions by interacting with its receptors. Adenosine and consequently adenosine deaminase can have pro or anti-inflammatory effects on tissues depending on how much time has passed from the start of the injury. In addition, an increase in adenosine deaminase activity has been reported for various diseases and the significant effect of deaminase inhibition on the clinical course of different diseases has been reported. However, the use of inhibitors is limited to only a few medical indications. Data on the increase of adenosine deaminase activity in different diseases and the impact of its inhibition in various cases have been collected and are discussed in this review. Overall, the evidence shows that many studies have been done to introduce inhibitors, however, in vivo studies have been much less than in vitro, and often have not been expanded for clinical use.
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Affiliation(s)
- S Bagheri
- Medical Biology Research Center, Health Technology Institute, Kermanshah University of Medical Sciences, Kermanshah, Iran.
| | - A A Saboury
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran.
| | - T Haertlé
- Institut National de la Recherche Agronomique, Nantes, France
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3
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Poursoleiman A, Karimi-Jafari MH, Zolmajd-Haghighi Z, Bagheri M, Haertlé T, Behbehani GR, Ghasemi A, Stroylova YY, Muronetz VI, Saboury AA. Polymyxins interaction to the human serum albumin: A thermodynamic and computational study. Spectrochim Acta A Mol Biomol Spectrosc 2019; 217:155-163. [PMID: 30933779 DOI: 10.1016/j.saa.2019.03.077] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2018] [Revised: 03/18/2019] [Accepted: 03/22/2019] [Indexed: 06/09/2023]
Abstract
Polymyxin B and E (colistin), are a group of cationic charged cyclic antibiotic lipopeptides that are frequently used in the clinics to treat infections caused by the multidrug-resistant gram-negative bacteria. Since the interactions with the blood plasma drug-transport proteins may play a critical role in determining their pharmacological and pharmacokinetic profiles, we studied the binding properties of polymyxins to the human serum albumin (HSA) under simulated physiological conditions by the combination of biophysical approaches, such as isothermal titration calorimetry (ITC), fluorescence anisotropy, circular dichroism (CD) buttressed by computational studies. The HSA binding to the polymyxins was relatively strong (Ka ≈ 1.0 × 107 M-1). Molecular docking indicated that polymyxins bind to the cleft of HSA between domains I and III via the electrostatic interactions. This evidence was further confirmed by the entropy-driven interaction for the polymyxins bound HSA. Far UV-CD experiments showed that the secondary structure of HSA doesn't alter and its stable structure is preserved. Collectively, these investigations revealed that the polymyxins bind preferentially to the partially unfolded intermediate forms of the protein structure; however, HSA molecule does not undergo any significant conformational changes upon binding. This is promising as it may limit the unfavorable side effects of the medicine. On the whole, the results provide quantitative and qualitative insight of the binding interaction between HSA and polymyxins, which is important in understanding their effect as therapeutic agents.
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Affiliation(s)
- A Poursoleiman
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran
| | - M H Karimi-Jafari
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran
| | - Z Zolmajd-Haghighi
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran
| | - M Bagheri
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran
| | - T Haertlé
- Poznan University of Life Sciences, Department of Animal Nutrition, Poznan, Poland; Biopolymers, Interactions, Assemblies, UR 1268, Institute National de la Recherche Agronomique, Nantes, France
| | - G Rezaei Behbehani
- Chemistry Department, Imam Khomeini International University, Qazvin, Iran
| | - A Ghasemi
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran
| | - Y Y Stroylova
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, Russia
| | - V I Muronetz
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, Russia
| | - A A Saboury
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran.
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Fotouhi L, Yousefinejad S, Salehi N, Saboury AA, Sheibani N, Moosavi-Movahedi AA. Application of merged spectroscopic data combined with chemometric analysis for resolution of hemoglobin intermediates during chemical unfolding. Spectrochim Acta A Mol Biomol Spectrosc 2015; 136 Pt C:1974-1981. [PMID: 25468440 PMCID: PMC6690049 DOI: 10.1016/j.saa.2014.10.120] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2014] [Revised: 10/21/2014] [Accepted: 10/28/2014] [Indexed: 06/04/2023]
Abstract
Using tetradecyltrimethylammonium bromide (TTAB) as a surfactant denaturant, and augmentation of different spectroscopic data, helped to detect the intermediates of hemoglobin (Hb) during unfolding process. UV-vis, fluorescence, and circular dichroism spectroscopy were used simultaneously to monitor different aspects of hemoglobin species from the tertiary or secondary structure points of view. Application of the multivariate curve resolution-alternating least square (MCR-ALS), using the initial estimates of spectral profiles and appropriate constraints on different parts of augmented spectroscopic data, showed good efficiency for characterization of intermediates during Hb unfolding. These results indicated the existence of five protein species, including three intermediate-like compounds in this process. The unfolding pathway in the presence of TTAB included conversion of oxyhemoglobin into deoxyhemoglobin, and then ferrylhemoglobin, ferrihemoglobin or aquamethemoglobin, which finally transformed into hemichrome. This is the first application of chemometric analysis on the merged spectroscopic data related to chemical denaturation of a protein. These types of analysis in multisubunit proteins not only increase the domain of information, but also can reduce the ambiguities of the obtained results.
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Affiliation(s)
- L Fotouhi
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran
| | - S Yousefinejad
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran
| | - N Salehi
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran
| | - A A Saboury
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran; Center of Excellence in Biothermodynamics, University of Tehran, Tehran, Iran
| | - N Sheibani
- Department of Ophthalmology and Visual Sciences and McPherson Eye Research Institute, School of Medicine and Public Health, University of Wisconsin, Madison, WI, USA
| | - A A Moosavi-Movahedi
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran; Center of Excellence in Biothermodynamics, University of Tehran, Tehran, Iran.
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Goodarzi M, Moosavi-Movahedi AA, Habibi-Rezaei M, Shourian M, Ghourchian H, Ahmad F, Farhadi M, Saboury AA, Sheibani N. Hemoglobin fructation promotes heme degradation through the generation of endogenous reactive oxygen species. Spectrochim Acta A Mol Biomol Spectrosc 2014; 130:561-567. [PMID: 24813286 DOI: 10.1016/j.saa.2014.04.056] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2013] [Revised: 03/25/2014] [Accepted: 04/04/2014] [Indexed: 06/03/2023]
Abstract
Protein glycation is a cascade of nonenzymatic reactions between reducing sugars and amino groups of proteins. It is referred to as fructation when the reducing monosaccharide is fructose. Some potential mechanisms have been suggested for the generation of reactive oxygen species (ROS) by protein glycation reactions in the presence of glucose. In this state, glucose autoxidation, ketoamine, and oxidative advance glycation end products (AGEs) formation are considered as major sources of ROS and perhaps heme degradation during hemoglobin glycation. However, whether fructose mediated glycation produces ROS and heme degradation is unknown. Here we report that ROS (H2O2) production occurred during hemoglobin fructation in vitro using chemiluminescence methods. The enhanced heme exposure and degradation were determined using UV-Vis and fluorescence spectrophotometry. Following accumulation of ROS, heme degradation products were accumulated reaching a plateau along with the detected ROS. Thus, fructose may make a significant contribution to the production of ROS, glycation of proteins, and heme degradation during diabetes.
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Affiliation(s)
- M Goodarzi
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran
| | - A A Moosavi-Movahedi
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran; Center of Excellence in Biothermodynamics, University of Tehran, Tehran, Iran.
| | - M Habibi-Rezaei
- School of Biology, University of Tehran, Tehran, Iran; Center of Excellence in NanoBioMedicine, University of Tehran, Tehran, Iran
| | - M Shourian
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran
| | - H Ghourchian
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran
| | - F Ahmad
- Centre for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia, New Delhi 110025, India
| | - M Farhadi
- ENT-HNS Research Center, IUMS, Tehran, Iran
| | - A A Saboury
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran; Center of Excellence in Biothermodynamics, University of Tehran, Tehran, Iran
| | - N Sheibani
- Department of Ophthalmology and Visual Sciences, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA
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Mansouri-Torshizi H, Saeidifar M, Rezaei-Behbehani GR, Divsalar A, Saboury AA. DNA Binding Studies and Cytotoxicity of Ethylenediamine 8-Hydroxyquinolinato Palladium(II) Chloride. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.201000192] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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7
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Saboury AA, Alijanianzadeh M. Ethyl Xanthate and Propyl Xanthate as Activators and Inhibitors of Mushroom Tyrosinase in Different Concentrations. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.200800139] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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8
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Moghaddamnia MH, Saboury AA, Hakimelahi GH, Moosavi-Moovahedi AA. Denaturation of Adenosine Deaminase with Urea and Guanidine Hydrochloride. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.199700063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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9
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Saboury AA, Shamsaei AA, Moosavi-Movahedi AA, Mansuri-Torshizi H. Thermodynamics of Binding 2,2′-Bipyridineglycinato Palladium (II) Chloride on Human Serum Albumin. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.199900125] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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10
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Saboury AA, Umar Dahot M, Ghobadi S, Chamani J, Moosavi-Movahedi AA. Thermodynamic Studies on the Interaction of Cobalt with Alpha-Amylase. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.199800101] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Taghavi F, Moosavi-Movahedi AA, Bohlooli M, Habibi-Rezaei M, Hadi Alijanvand H, Amanlou M, Sheibani N, Saboury AA, Ahmad F. Energetic domains and conformational analysis of human serum albumin upon co-incubation with sodium benzoate and glucose. J Biomol Struct Dyn 2013; 32:438-47. [PMID: 23581982 DOI: 10.1080/07391102.2013.775599] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Sodium benzoate (SB), a powerful inhibitor of microbial growth, is one of the most commonly used food preservative. Here, we determined the effects of SB on human serum albumin (HSA) structure in the presence or absence of glucose after 35 days of incubation under physiological conditions. The biochemical, biophysical, and molecular approaches including free amine content assay (TNBSA assay), fluorescence, and circular dichroism spectroscopy (CD), differential scanning calorimetry (DSC), and molecular docking and LIGPLOT studies were utilized for structural studies. The TNBSA results indicated that SB has the ability to bind Lys residues in HSA through covalent bonds. The docking and LIGPLOT studies also determined another specific site via hydrophobic interactions. The CD results showed more structural helicity for HSA incubated with SB, while HSA incubated with glucose had the least, and HSA incubated with glucose + SB had medium helicity. Fluorescence spectrophotometry results demonstrated partial unfolding of HSA incubated with SB in the presence or absence of glucose, while maximum partial unfolding was observed in HSA incubated with glucose. These results were confirmed by DSC and its deconvoluted thermograms. The DSC results also showed significant changes in HSA energetic structural domains due to HSA incubation with SB in the presence or absence of glucose. Together, our studies showed the formation of three different intermediates and indicate that biomolecular investigation are effective in providing new insight into safety determinations especially in health-related conditions including diabetes.
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Affiliation(s)
- F Taghavi
- a Institute of Biochemistry and Biophysics, University of Tehran , Tehran , Iran
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Ghamari F, M. Ghaffari S, Salami M, Moosavi-Movahedi F, Farivar F, Johari A, A. Saboury A, M. Chobert J, Haertle T, A. Moosavi-Movahedi A. Synergic Study of α-Glucosidase Inhibitory Action of Aloin and its Antioxidant Activity with and without Camel β-Casein and its Peptides. Protein Pept Lett 2013; 20:607-12. [DOI: 10.2174/0929866511320050015] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2012] [Revised: 09/14/2012] [Accepted: 09/14/2012] [Indexed: 11/22/2022]
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Rajabzadeh H, Nourouzian D, Alijanvand HH, Divsalar A, Badraghi J, Barzegar A, Monajjemi M, Zare K, Sheibani N, Saboury AA, Moosavi-Movahedi AA. Kinetic stabilization of lysozyme upon interactions with β-cyclodextrin through partial unfolding. JICS 2012. [DOI: 10.1007/bf03249090] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/07/2022]
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14
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Alaei L, A.Moosavi-Movahedi A, Hadi H, A. Saboury A, Ahmad F, Amani M. Thermal Inactivation and Conformational Lock of Bovine Carbonic Anhydrase. Protein Pept Lett 2012; 19:852-8. [DOI: 10.2174/092986612801619507] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2011] [Revised: 01/26/2012] [Accepted: 01/26/2012] [Indexed: 11/22/2022]
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15
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Rezaei Behbehani G, Mirzaie M, Mehreshtiag M, Barzegar L, Saboury AA, Mohammadi Gorgi S. Inhibitory Effects of p-Phenylene-bis and Phenyl Dithiocarbamate on Mushroom Tyrosinase. J SOLUTION CHEM 2012. [DOI: 10.1007/s10953-012-9821-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2022]
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Derakhshankhah H, Saboury AA, Bazl R, Tajmir-Riahi HA, Falahati M, Ajloo D, Mansoori-Torshizi H, Divsalar A, Hekmat A, Moosavi-Movahedi AA. Synthesis, cytotoxicity and spectroscopy studies of a new copper (II) complex: calf thymus DNA and T47D as targets. J IRAN CHEM SOC 2012. [DOI: 10.1007/s13738-012-0086-3] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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17
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Bagheri S, Davoodi J, Saboury AA, Salmanian AH. A mechanistic insight into caspase-7 inhibition by BIR1-2 domains of XIAP and cIAP1. J IRAN CHEM SOC 2012. [DOI: 10.1007/s13738-012-0076-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Mansouri-Torshizi H, Saeidifar M, Divsalar A, Saboury AA. Binding studies of a novel antitumor palladium(II) complex to calf thymus DNA. Nucleosides, Nucleotides & Nucleic Acids 2011; 30:405-22. [PMID: 21780907 DOI: 10.1080/15257770.2011.586008] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
The interaction of new 1, 10-phenanthrolineoctyldithiocarbamatopalladium (II) nitrate with DNA from calf thymus was investigated at 300 and 310 K in a Tris-HCl buffer of pH 7.0 medium containing 20 mM sodium chloride. This water soluble, square planar Pd(II) complex has been synthesized and spectroscopic (electronic, infrared, and nuclear magnetic resonance) and elemental analysis of the complex are discussed. This complex shows greater growth inhibitory activity against human tumor cell line K562 than cisplatin. Results of UV-visible studies show that the complex exhibits cooperative binding with DNA and denatures the DNA at an extremely low concentration (∼11.98 μM). Fluorescence studies reveal that the mode of binding of this complex with DNA seems to be intercalation. The results of sephadex G-25 column show that the binding of metal complex with DNA is so strong that it does not readily break. Several binding and thermodynamic parameters are also described. They may shed light on the mechanisms of interaction of this agent with DNA, which should be quite different from that of cisplatin.
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Affiliation(s)
- H Mansouri-Torshizi
- Department of Chemistry, University of Sistan and Baluchestan, Zahedan, Iran.
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Mansouri-Torshizi H, Saeidifar M, Divsalar A, Saboury AA. Study on interaction of DNA from calf thymus with 1,10-phenanthrolinehexyldithiocarbamatopalladium(II) nitrate as potential antitumor agent. J Biomol Struct Dyn 2011; 28:805-14. [PMID: 21294591 DOI: 10.1080/07391102.2011.10508608] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
A novel palladium(II) complex has been synthesized with hexyldithiocarbamate (Hex-dtc) and 1,10-phenanthroline (phen) by the reaction of [Pd(phen)(H(2)O)(2)](NO(3))(2) with sodium salt of hexyldithiocarbamate and a complex of type [Pd(Hex-dtc) (phen)]NO(3) has been obtained. The complex has been characterized by elemental analysis, molar conductance, (1)H NMR, IR and electronic spectroscopic studies. The dithiocarbamate ligand acts in bidentate fashion. This water-soluble complex was screened against chronic myelogenous leukemia cell line, K562, for cytotoxic effects and showed significant antitumor activity much lower than that of cisplatin. The interaction of this complex with calf thymus DNA (ctDNA) was extensively investigated by a variety of spectroscopic techniques. Absorbance titration experiments imply the interaction of 4 Pd(II) complex molecules per 1000 nucleotides on DNA with positive cooperativity in the binding process and the complex denature the DNA at very low concentration (~14.3 µM). Fluorescence titration spectra and fluorescence Scatchard plots suggest that the Pd(II) complex intercalate in DNA. The gel chromatograms obtained from Sephadex G-25 column experiments showed that the binding of metal complex with DNA is so strong that it does not readily break. Furthermore, some thermodynamic and binding parameters found in the process of UV-Visible studies are described. They may provide specificity of the compound with ctDNA.
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Affiliation(s)
- H Mansouri-Torshizi
- Department of Chemistry, University of Sistan and Baluchestan, Zahedan, Iran.
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Rezaei Behbehani G, Saboury AA, Sabbaghy F. A Calorimetric Study on the Interaction of Zinc and Cadmium Ions with Jack Bean Urease. CHINESE J CHEM 2011. [DOI: 10.1002/cjoc.201190102] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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21
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Rezaei Behbehani G, Divsalar A, Saboury AA, Hajian R, Rezaei Z, Yahaghi E, Barzegar L. A Thermodynamic Study on the Binding of Cobalt(II) and Iron(III) Ions with Bovine Carbonic Anhydrase II at Different Temperatures. J SOLUTION CHEM 2010. [DOI: 10.1007/s10953-010-9572-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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22
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Amin E, Saboury AA, Mansuri-Torshizi H, Moosavi-Movahedi AA. Potent inhibitory effects of benzyl and p-xylidine-bis dithiocarbamate sodium salts on activities of mushroom tyrosinase. J Enzyme Inhib Med Chem 2010; 25:272-81. [PMID: 19663663 DOI: 10.1080/14756360903179351] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
Abstract
A novel monofunctional benzyldithiocarbamate, C(6)H(5)CH(2)NHCSSNa (I), and a bifunctional p-xylidine-bis(dithiocarbamate), NaSSCNHCH(2)C(6)H(4)CH(2)NHCSSNa (II), as sodium salts, were synthesized by reaction between p-xylylenediamine or benzylamine with CS(2) in the presence of NaOH. They were characterized by spectroscopic techniques such as (1)H NMR, IR, and elemental analysis. These water-soluble compounds were examined for their inhibition of both activities of mushroom tyrosinase (MT) from a commercial source of Agricus bisporus. l-3,4- Dihydroxyphenylalanine (L-DOPA) and l-tyrosine were used as natural substrates for the catecholase and cresolase enzyme reactions, respectively. Kinetic studies showed noncompetitive inhibition of I and mixed type inhibition of II on both activities of MT. The inhibition constant (K(I)) of II was smaller than that of I. Raising the temperature from 27 to 37 degrees C caused a decrease in K(I) values of I and an increase in values of II. The binding process for inhibition of I was only entropy driven, which means that the predominant interaction in the active site of the enzyme is hydrophobic; meanwhile, the electrostatic interaction can be important for the inhibition of II due to the enthalpy driven binding process. Fluorescence studies showed a decrease of emission intensity without a shift of emission maximum in the presence of different concentrations of compounds. An extrinsic fluorescence study did not show any considerable change of the tertiary structure of MT. Probably, the conformation of inhibitor-bound MT is stable and inflexible compared with uninhibited MT.
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Affiliation(s)
- E Amin
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran
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Rezaei Behbehani G, Saboury AA, Zarean O, Barzegar L, Ghamamy S. Thermodynamic Study of Myelin Basic Protein upon Interaction with [Hg2+] Using Extension Solvation Model. CHINESE J CHEM 2010. [DOI: 10.1002/cjoc.201090136] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Amin E, Saboury AA, Mansuri-Torshizi H, Moosavi-Movahedi AA. Potent inhibitory effects of benzyl and p-xylidine-bis dithiocarbamate sodium salts on activities of mushroom tyrosinase. J Enzyme Inhib Med Chem 2010. [DOI: 10.3109/14756360903179351] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- E. Amin
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran
| | - A. A. Saboury
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran
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Rezaei Behbehani G, Divsalar A, Saboury AA, Faridbod F, Ganjali MR. A Thermodynamic Study on the Binding of Human Serum Albumin with Lanthanum Ion. CHINESE J CHEM 2010. [DOI: 10.1002/cjoc.201090047] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Moosavi-Movahedi AA, Mousavy SJ, Divsalar A, Babaahmadi A, Karimian K, Shafiee A, Kamarie M, Poursasan N, Farzami B, Riazi GH, Hakimelahi GH, Tsai FY, Ahmad F, Amani M, Saboury AA. The Effects of Deferiprone and Deferasirox on the Structure and Function of β-Thalassemia Hemoglobin. J Biomol Struct Dyn 2009; 27:319-39. [DOI: 10.1080/07391102.2009.10507319] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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Mansouri-Torshizi H, Moghaddam MI, Divsalar A, Saboury AA. Diimine platinum(II) and palladium(II) complexes of dithiocarbamate derivative as potential antitumor agents: synthesis, characterization, cytotoxicity, and detail dna-binding studies. J Biomol Struct Dyn 2009; 26:575-86. [PMID: 19236108 DOI: 10.1080/07391102.2009.10507273] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
The synthesis and chemical characterization of two structurally related platinum(II) and palladium(II) complexes, [M(2,2'-bipyridine)(morpholinedithiocarbamate)]NO(3) or [M(bpy)(mor-dtc)]NO(3), where M = Pt(II) or Pd(II), are described. Studies of anti-tumor activities of these complexes against human cell tumor lines (K(562)) have been carried out. They show 50% cytotoxic concentration (Cc(50)) values much lower than that of cisplatin. Both of these water soluble complexes have been shown to interact with calf thymus DNA (ct-DNA) using difference absorption-, fluorescence-, and circular dichroism-titration techniques. These studies showed that both complexes exhibit cooperative binding and presumably intercalate in DNA. These complexes unexpectedly denature DNA at very low concentrations (50-100 microM). Several binding and thermodynamic parameters are also described.
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Rezaei Behbehani G, Divsalar A, Saboury AA, Hekmat A. A Thermodynamic Study on the Binding of PEG-Stearic Acid Copolymer with Lysozyme. J SOLUTION CHEM 2008. [DOI: 10.1007/s10953-008-9360-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Behbehani GR, Saboury AA, Divsalar A. Thermodynamic study of the binding of calcium and magnesium ions with myelin basic protein using the extended solvation theory. Acta Biochim Biophys Sin (Shanghai) 2008; 40:964-9. [PMID: 18989578 DOI: 10.1111/j.1745-7270.2008.00477.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
The interaction of myelin basic protein (MBP) from the bovine central nervous system with Ca2+ and Mg2+ ions, named as M2+, was studied by isothermal titration calorimetry at 27 degrees C in aqueous solution. The extended solvation model was used to reproduce the enthalpies of MBP+M2+ interactions. The solvation parameters recovered from the extended solvation model were attributed to the structural change of MBP due to the metal ion interaction. It was found that there is a set of two identical and noninteracting binding sites for Ca2+ and Mg2+ ions.
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Affiliation(s)
- G Rezaei Behbehani
- Chemistry Department, Imam Khomeini International University, Qazvin, Iran.
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Saboury AA, Zolghadri S, Haghbeen K, Moosavi-Movahedi AA. The inhibitory effect of benzenethiol on the cresolase and catecholase activities of mushroom tyrosinase. J Enzyme Inhib Med Chem 2008; 21:711-7. [PMID: 17252944 DOI: 10.1080/14756360600810787] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
Abstract
The inhibitory effect of benzenethiol on the cresolase and catecholase activities of mushroom tyrosinase (MT) have been investigated at two temperatures of 20 and 30 degrees C in 10 mM phosphate buffer solution, pHs 5.3 and 6.8. The results show that benzenethiol can inhibit both activities of mushroom tyrosinase competitively. The inhibitory effect of benzenethiol on the cresolase activity is more than the catecholase activity of MT. The inhibition constant (K(i)) value at pH 5.3 is smaller than that at pH 6.8 for both enzyme activities. However, the K(i) value increases in cresolase activity and decreases in catecholase activity due to the increase of temperature from 20 to 30 degrees C at both pHs. Moreover, the effect of temperature on K(i) value is more at pH 6.8 for both cresolase and catecholase activities. The type of binding process is different in the two types of MT activities. The binding process for catecholase inhibition is only entropy driven, which means that the predominant interaction in the active site of the enzyme is hydrophobic, meanwhile the electrostatic interaction can be important for cresolase inhibition due to the enthalpy driven binding process. Fluorescence and circular studies also show a minor change in the tertiary structure, without any change in the secondary structure, of the enzyme due to the electrostatic interaction in cresolase inhibition by benzenethiol at acidic pH.
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Affiliation(s)
- A A Saboury
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran.
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Alijanianzadeh M, Saboury AA, Mansuri-Torshizi H, Haghbeen K, Moosavi-Movahedi AA. The inhibitory effect of some new synthesized xanthates on mushroom tyrosinase activities. J Enzyme Inhib Med Chem 2008; 22:239-46. [PMID: 17518352 DOI: 10.1080/14756360601114536] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
Abstract
Three iso-alkyldithiocarbonates (xanthates), as sodium salts, C3H7OCS2Na (I), C4H9OCS2Na (II) and C5H11OCS2Na (III), were synthesized, by the reaction between CS2 with the corresponding iso-alcohol in the presence of NaOH, and examined for inhibition of both cresolase and catecholase activities of mushroom tyrosinase (MT) from a commercial source of Agricus bisporus. 4-[(4-methylbenzo)azo]-1,2-benzendiol (MeBACat) and 4-[(4-methylphenyl)azo]-phenol (MePAPh) were used as synthetic substrates for the enzyme for the catecholase and cresolase reactions, respectively. Lineweaver-Burk plots showed different patterns of mixed and competitive inhibition for the three xanthates and also for cresolase and catecholase activities of MT. For cresolase activity, I and II showed a mixed inhibition pattern but III showed a competitive inhibition pattern. For catecholase activity, I showed mixed inhibition but II and III showed competitive inhibition. These new synthesized compounds are potent inhibitors of MT with K(i) values of 9.8, 7.2 and 6.1 microM for cresolase inhibitory activity, and also 12.9, 21.8 and 42.2 microM for catecholase inhibitory activity for I, II and III, respectively. They showed a greater inhibitory potency towards the cresolase activity of MT. Both substrate and inhibitor can be bound to the enzyme with negative cooperativity between the binding sites (alpha > 1) and this negative cooperativity increases with increasing length of the aliphatic tail in these compounds in both cresolase and catecholase activities. The cresolase inhibition is related to the chelating of the copper ions at the active site by a negative head group (S-) of the anion xanthate, which leads to similar values of K(i) for all three xanthates. Different K(i) values for catecholase inhibition are related to different interactions of the aliphatic chains of I, II and III with hydrophobic pockets in the active site of the enzyme.
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Affiliation(s)
- M Alijanianzadeh
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran
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Gheibi N, Saboury AA, Mansuri-Torshizi H, Haghbeen K, Moosavi-Movahedi AA. The inhibition effect of some n-alkyl dithiocarbamates on mushroom tyrosinase. J Enzyme Inhib Med Chem 2008; 20:393-9. [PMID: 16206836 DOI: 10.1080/14756360500179903] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
Abstract
Three new n-alkyl dithiocarbamate compounds, as sodium salts, C4H9NHCS2Na (I), C6H13NHCS2Na (II) and C8H17NHCS2Na (III), were synthesized and examined for inhibition of both cresolase and catecholase activities of mushroom tyrosinase (MT) from a commercial source of Agaricus bisporus in 10 mM phosphate buffer pH 6.8, at 293K using UV spectrophotometry. Caffeic acid and p-coumaric acid were used as natural substrates for the enzyme for the catecholase and cresolase reactions, respectively. Lineweaver-Burk plots showed different patterns of mixed and competitive inhibition for catecholase and cresolase reactions, respectively. These new synthetic compounds can be classified as potent inhibitors of MT due to Ki values of 0.8, 1.0 and 1.8 microM for cresolase inhibitory activity, and also 9.4, 14.5 and 28.1 microM for catecholase inhibitory activity for I, II and III, respectively. They showed a greater potency in the inhibitory effect towards the cresolase activity of MT. Both substrate and inhibitor can be bound to the enzyme with negative cooperativity between the binding sites (alpha > 1) and this negative cooperativity increases with increasing length of the aliphatic tail in these compounds. The inhibition mechanism is presumably related to the chelating of the binuclear coppers at the active site and the different Ki values may be related to different interaction of the aliphatic chains of I, II and III with the hydrophobic pocket in the active site of the enzyme.
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Affiliation(s)
- N Gheibi
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran
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Dahot MU, Saboury AA, Moosavi-Movahedi AA. Inhibition of β-Amylase Activity by Calcium, Magnesium and Zinc Ions Determined by Spectrophotometry and Isothermal Titration Calorimetry. J Enzyme Inhib Med Chem 2008; 19:157-60. [PMID: 15449730 DOI: 10.1080/14756360310001650255] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
Abstract
The inhibition effect of metal ions on beta amylase activity was studied. The inhibitor-binding constant (Ki) was determined by spectrophotometric and isothermal titration calorimetric (ITC) methods. The binding of calcium, magnesium and zinc ion as inhibitors at the active site of barley beta amylase was studied at pH = 4.8 (sodium acetate 16 mM) and T = 300K. The Ki and enthalpy of binding for calcium (13.4, 13.1 mM and -14.3 kJ/mol), magnesium (18.6, 17.8mM and -17.7 kJ/mol) and zinc (17.5, 17.7 mM and -20.0 kJ/mol) were found by spectrophotometric and ITC methods respectively.
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Affiliation(s)
- M Umar Dahot
- Institute of Biotechnology and Genetic Engineering, University of Sindh, Jamshoro, Pakistan.
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Valiyev F, Tsai FY, Saboury AA, Liu HJ, Moosavi-Movahedi AA, Hakimelahi GH. Design, synthesis, and antiviral activity of novel phosphoramidates. JICS 2008. [DOI: 10.1007/bf03246112] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Gheibi N, Saboury AA, Haghbeen K, Moosavi-Movahedi AA. Activity and structural changes of mushroom tyrosinase induced by n-alkyl sulfates. Colloids Surf B Biointerfaces 2008; 45:104-7. [PMID: 16144759 DOI: 10.1016/j.colsurfb.2005.08.001] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2005] [Revised: 07/30/2005] [Accepted: 08/06/2005] [Indexed: 10/25/2022]
Abstract
Catecholase activity and structural changes of mushroom tyrosinase (MT) were studied in the presence of some n-alkyl sulfate derivatives. Experiments showed that MT reached its optimal activity in the presence of 1.5, 0.6, and 0.2 mM of sodium n-octyl sulfate (SOS), sodium n-dodecyl sulfate (SDS) and sodium n-tetradecyl sulfate (STS), respectively. Native and incubated MT with the n-alkyl sulfates were also investigated from structural point of view by far-UV circular dichroism (CD) and intrinsic fluorescence spectroscopy. At the above mentioned concentrations of SOS, SDS, and STS no change in the secondary structure of MT was observed. However, changes in the tertiary structure of the enzyme due to the presence of n-alkyl sulfates were obvious. Results of this research indicate that n-alkyl sulfate with longer chain induces greater conformational changes in MT, hence, can activate it at lower concentrations.
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Affiliation(s)
- N Gheibi
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran
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Behbehani GR, Saboury AA, Taleshi E. A direct calorimetric determination of denaturation enthalpy for lysozyme in sodium dodecyl sulfate. Colloids Surf B Biointerfaces 2008; 61:224-8. [PMID: 17889513 DOI: 10.1016/j.colsurfb.2007.08.007] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2007] [Revised: 08/09/2007] [Accepted: 08/15/2007] [Indexed: 11/30/2022]
Abstract
Thermodynamics of the interaction between sodium dodecyl sulfate (SDS) with lysozyme were investigated at pH 7.0 and 27 degrees C in phosphate buffer by isothermal titration calorimetry. A new method to follow protein denaturation, and the effect of surfactants on the stability of proteins was introduced. The new solvation model was used to reproduce the enthalpies of lysozyme-SDS interaction over the whole range of SDS concentrations. The solvation parameters recovered from the new equation, attributed to the structural change of lysozyme and its biological activity. At low concentrations of SDS, the binding is mainly electrostatic, with some simultaneous interaction of the hydrophobic tail with nearby hydrophobic patches on the lysozyme. These initial interactions presumably cause some protein unfolding and expose additional hydrophobic sites. The enthalpy of denaturation is 160.81+/-0.02 kJ mol(-1) for SDS.
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Affiliation(s)
- G Rezaei Behbehani
- Chemistry Department, Imam Khomeini International University, Qazvin, Iran.
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Behbehani GR, Saboury AA, Taleshi E. Determination of partial unfolding enthalpy for lysozyme upon interaction with dodecyltrimethylammonium bromide using an extended solvation model. J Mol Recognit 2008; 21:132-5. [DOI: 10.1002/jmr.881] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Moosavi-Movahedi AA, Pirzadeh P, Hashemnia S, Ahmadian S, Hemmateenejad B, Amani M, Saboury AA, Ahmad F, Shamsipur M, Hakimelahi GH, Tsai FY, Alijanvand HH, Yousefi R. Fibril formation of lysozyme upon interaction with sodium dodecyl sulfate at pH 9.2. Colloids Surf B Biointerfaces 2007; 60:55-61. [PMID: 17616361 DOI: 10.1016/j.colsurfb.2007.05.018] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2006] [Revised: 05/25/2007] [Accepted: 05/25/2007] [Indexed: 11/26/2022]
Abstract
Fibril formation seems to be a general property of all proteins. Its occurrence in hen or human lysozyme depends on certain conditions, namely acidic pHs or the presence of some additives. This paper studies the interaction of lysozyme with sodium dodecyl sulfate (SDS) at pH 9.2, using UV-visible spectrophotometry, circular dichroism (CD) spectropolarimetry, electron microscopy (EM) and chemometry. Based on observations such as the strange increase in absorbance at 650nm (pH 9.2) and the presence of intermediates, it is assumed that lysozyme fibrils have been formed at pH 9.2 in the presence of SDS as an anionic surfactant. Thioflavin T emission fluorescence and an EM image confirmed this assumption. beta-cyclodextrin was then used as a turbidity inhibitor to establish its effect on the distribution of intermediates that participate in fibril formation.
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Divsalar A, Saboury AA, Mansoori-Torshizi H, Moosavi-Movahedi AA. Binding Properties of a New Anti-tumor Component (2,2′-bipyridin octylglycinato Pd(II) nitrate) with Bovine β-lactoglobulin-A and -B. J Biomol Struct Dyn 2007; 25:173-82. [PMID: 17718596 DOI: 10.1080/07391102.2007.10507166] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
An new water soluble palladium (II) complex of formula [Pd(bpy)(Oct-Gly)]NO(3), (where bpy is 2,2'-bipyridine and Oct-Gly is octylglycine) have been synthesised. The Pd(II) complex has been characterized by elemental analysis and conductivity measurements as well as spectroscopic methods such as infrared, (1)H NMR, and ultraviolet-visible. The interaction between the new Pd(II)-complex (2,2'-bipyridin octylglycinato Pd(II) nitrate), an anti-tumor component, with beta-lactoglobulin-A and -B (BLG-A and -B) was studied by fluorescence spectroscopy and far and near-UV circular dichroism (CD) spectrophotometric techniques. A strong fluorescence quenching interaction of Pd(II) complex with BLG-A and -B was observed. The quenching constant was determined using the modified Stern-Volmer equation. The calculated binding constants of Pd(II) complex with BLG-A and -B were 0.51 and 0.28 (x 10(6) M(-1)) and the corresponding average number of binding sites were 2.8 and 1.5, respectively. Far-UV CD studies showed that the Pd(II) complex can significantly change the secondary structure of BLG-A and -B via an increase in the content of alpha-helix structure, which stabilizes the secondary structure of the proteins. Near-UV CD data clearly indicate the alteration in the tertiary structure of BLG-A and -B due to the interaction with Pd(II) complex. Pd(II) complex can change and stabilize both the secondary and tertiary structures of BLG-A more than BLG-B. These conformational changes may be considered to be a deleterious effect of the designed ligand on the protein structures. The difference in the interaction properties observed for BLG-A and -B with Pd(II) complex is due to the difference in the amino acid sequences between these two variants.
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Affiliation(s)
- A Divsalar
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran
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Rezaei-Zarchi S, Saboury AA, Ghourchian H, Hong J, Barzegar A, Norouzi P, Moosavi-Movahedi AA, Ganjali MR, Javed A. Electrochemical investigation of the effect of some organic phosphates on haemoglobin. J Biosci 2007; 32:271-8. [PMID: 17435319 DOI: 10.1007/s12038-007-0027-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
The effects of DPG,IHP,GTP,GDP and GMP on the structure and stability of haemoglobin were electrochemically investigated with an iodide-modified silver electrode in 0.01 M KNO 3 at pH 7.0.Anodic and cathodic peaks of haemoglobin were observed at 250 mV and 12 mV with a formal potential value of 133 mV vs.Ag/AgCl.The effects of different concentrations of DPG,IHP,GTP,GDP and GMP on the anaerobic redox reaction were determined. The results showed that DPG and IHP can lead to a positive shift in the reduction peak of haemoglobin,indicating that the oxidation peak shift of haemoglobin was small as a result of stabilization of the reduced state and destabilization of the R-like state of haemoglobin.GTP elicited a more positive shift in the cathodic and anodic peaks of haemoglobin at a higher concentration,signifying that it has a low-affinity binding site on haemoglobin.The positive shift of the cathodic and anodic peaks revealed a slight variation in the structure and indicated the unfolding of haemoglobin in the presence of high concentrations of GTP.Our study also showed that GDP and GMP did not cause significant shift the cathodic and anodic peaks of haemoglobin even at high concentrations,refuting the existence of specific GDP-and GMP-binding sites on the protein.Moreover,the iodide-modified silver electrode method proved to be easy and useful in investigating the effects of ligands or other effectors on haemoglobin in solution.
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Affiliation(s)
- S Rezaei-Zarchi
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran
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Divsalar A, Saboury AA, Yousefi R, Moosavi-Movahedi AA, Mansoori-Torshizi H. Spectroscopic and cytotoxic studies of the novel designed palladium(II) complexes: β-Lactoglobulin and K562 as the targets. Int J Biol Macromol 2007; 40:381-6. [PMID: 17097727 DOI: 10.1016/j.ijbiomac.2006.09.015] [Citation(s) in RCA: 75] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2006] [Revised: 09/25/2006] [Accepted: 09/26/2006] [Indexed: 11/20/2022]
Abstract
Since palladium complexes have been reported to show fewer side effects relative to other heavy metal anticancer compounds, in this study a new class of four structurally related anticancer Pd(II) complexes including 2,2'-bipyridin-n-butyl dithiocarbamato Pd(II) nitrate (Com-1), 2,2'-bipyridin-n-hexyl dithiocarbamato Pd(II) nitrate (Com-2), 2,2'-bipyridin glycinato Pd(II) nitrate (Com-3) and 2,2'-bipyridin octylglycinato Pd(II) nitrate (Com-4) was designed. The effect of four synthesized ligands on the protein structure and cell proliferation were investigated. Whey carrier proteins beta-lactoglobulin-A and-B (BLG-A and-B) and chronic myelogenous leukemia cell line K562 were the targets. Fluorescence and CD instruments were used to assess effect of the ligands on the protein structure. Growth inhibitory effect of the Pd(II) complexes towards the cancer cells was measured using 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT) assay. Results of fluorescence studies revealed that the complexes had no dithiocarbamate moiety (compounds 3 and 4) could quench the intrinsic fluorescence emission of the proteins at lower concentrations than those had such moiety (compounds 1 and 2). The far-UV-CD studies revealed that the regular secondary structure of BLG-A and -B did not show any noticeable alteration upon interaction with different of Pd(II)-complexes. The results of cell proliferation assay also displayed that Com-1 and Com-2 had more growth inhibitory activity against K562, than Com-3 and Com-4. Our results suggested that addition of dithiocarbamate moiety to structure of Pd(II) complexes probably has important role to improve the antiproliferative properties of the anticancer ligands and fewer effects on the carrier protein structure.
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Affiliation(s)
- A Divsalar
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran
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Hashemnia S, Moosavi-Movahedi AA, Ghourchian H, Ahmad F, Hakimelahi GH, Saboury AA. Diminishing of aggregation for bovine liver catalase through acidic residues modification. Int J Biol Macromol 2006; 40:47-53. [PMID: 16828155 DOI: 10.1016/j.ijbiomac.2006.05.011] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2006] [Revised: 05/21/2006] [Accepted: 05/24/2006] [Indexed: 11/18/2022]
Abstract
The tendency of proteins to aggregate is an important problem in biotechnology and the pharmaceutical industry. Because proteins in the aggregated state generally do not have the same biological activity as proteins in the native state. In order to prevent aggregation, it is essential to know the effective parameters in anti-aggregation mechanism. Using a chemical protein modification approach, UV-vis and fluorescence spectroscopies and circular dichroism spectropolarimetry, this study investigates the parameters involved in anti-aggregation mechanism of bovine liver catalase. Our findings clearly indicate that the modified bovine liver catalase provides better protection than the native enzyme against thermal aggregation. It seems that a decrease in hydrophobicity resulting in chemical modification plays an important role in preventing aggregation.
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Affiliation(s)
- S Hashemnia
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran
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Pirzadeh P, Moosavi-Movahedi AA, Hemmateenejad B, Ahmad F, Shamsipur M, Saboury AA. Chemometric studies of lysozyme upon interaction with sodium dodecyl sulfate and β-cyclodextrin. Colloids Surf B Biointerfaces 2006; 52:31-8. [PMID: 16839751 DOI: 10.1016/j.colsurfb.2006.05.019] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2006] [Revised: 04/22/2006] [Accepted: 05/26/2006] [Indexed: 11/18/2022]
Abstract
The interaction of hen egg-white lysozyme with sodium n-dodecyl sulfate (SDS) as an anionic surfactant was investigated by UV-vis spectrophotometry at different pHs at 25 degrees C using HCl/glycine and NaOH/glycine for acidic and basic pH ranges, respectively. Analysis of the spectral data using chemometric method gave the evidence for the existence of intermediate components during the cited interaction. Results also indicated a connection between turbidity of the protein solution upon interaction with SDS and distribution of our newly found intermediates. As intermediates are important in aggregation of proteins, beta-cyclodextrin was employed as an anti-aggregation agent and the results obtained for the lysozyme-SDS-beta-cyclodextrin ternary system were compared with those obtained in the absence of beta-cyclodextrin on distribution and mole fraction of intermediates with. It is also shown that as the distribution of intermediates broadens in a range of SDS concentrations, the turbidity and aggregation state of solution are reduced.
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Affiliation(s)
- P Pirzadeh
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran
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Abstract
The thermodynamical stability and remained activity of mushroom tyrosinase (MT) from Agaricus bisporus in 10 mM phosphate buffer, pH 6.8, stored at two temperatures of 4 and 40 degrees C were investigated in the presence of three different amino acids (His, Phe and Asp) and also trehalose as osmolytes, for comparing with the results obtained in the absence of any additive. Kinetics of inactivation obey the first order law. Inactivation rate constant (kinact) value is the best parameter describing effect of osmolytes on kinetic stability of the enzyme. Trehalose and His have the smallest value of kinact (0.7x10(-4) s-1) in comparison with their absence (2.5x10(-4) s-1). Moreover, to obtain effect of these four osmolytes on thermodynamical stability of the enzyme, protein denaturation by dodecyl trimethylammonium bromide (DTAB) and thermal scanning was investigated. Sigmoidal denaturation curves were analysed according to the two states model of Pace theory to find the Gibbs free energy change of denaturation process in aqueous solution at room temperature, as a very good thermodynamic criterion indicating stability of the protein. Although His, Phe and Asp induced constriction of MT tertiary structure, its secondary structure had not any change and the result was a chemical and thermal stabilization of MT. The enzyme shows a proper coincidence of thermodynamic and structural changes with the presence of trehalose. Thus, among the four osmolytes, trehalose is an exceptional protein stabilizer.
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Affiliation(s)
- N Gheibi
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran
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47
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Moosavi-Movahedi Z, Safarian S, Zahedi M, Sadeghi M, Saboury AA, Chamani J, Bahrami H, Ashraf-Modarres A, Moosavi-Movahedi AA. Calorimetric and Binding Dissections of HSA Upon Interaction with Bilirubin. Protein J 2006; 25:193-201. [PMID: 16721655 DOI: 10.1007/s10930-006-9002-y] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The interactions between bilirubin and human serum albumin (HSA) were studied by isothermal titration calorimetry (ITC) and UV-vis spectrophotometry at 27 degrees C in 100 mM phosphate buffer pH 7.4 containing 1 mM EDTA. The biphasic shape of the HSA-bilirubin binding curve depicted the existence of two bilirubin binding sets on the HSA structure which had distinct binding interactions. Each binding set contained one or more bilirubin binding site. The first binding set at subdomain IIA included one binding site and had a more hydrophobic microenvironment than the other two binding sites in the second bilirubin binding set (subdomain IIIA). With our method of analysis, the calculated dissociation constant of the first binding site is 1.28 x 10(-6) M and 4.80 x 10(-4) M for the second and third binding sites. Here, the typical Boltzmann's equation was used with a new approach to calculate the dissociation constants as well as the standard free energy changes for the HSA-bilirubin interactions. Interestingly, our calculations obtained using the Wyman binding potential theory confirmed that our analysis method had been correct (especially for the second binding phase). The molar extinction coefficient determined for the first bound bilirubin molecule depicted that the bilirubin molecules (in low concentrations) should interact with the nonpolar microenvironment of the first high affinity binding site. Binding of the bilirubin molecules to the first binding site was endothermic (deltaH > 0) and occurred through the large increase in the binding entropy established when the hydrophobic bilirubin molecules escaped from their surrounding polar water molecules and into the hydrophobic medium of the first binding site. On the other hand, the calculated molar extinction coefficient illustrated that the microenvironment of the second binding set (especially for the third binding site) was less hydrophobic than the first one but still more hydrophobic than the buffer medium. The binding of the third bilirubin molecule to the HSA molecule was established more through exothermic (electrostatic) interactions.
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Affiliation(s)
- Z Moosavi-Movahedi
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran
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48
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49
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Divsalar A, Saboury AA, Moosavi-Movahedi AA. Conformational and Structural Analysis of Bovine β Lactoglobulin-A Upon Interaction with Cr+3. Protein J 2006; 25:157-65. [PMID: 16862458 DOI: 10.1007/s10930-006-0007-3] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2005] [Indexed: 11/30/2022]
Abstract
Thermodynamic studies have been made on the effect of Cr(+3) on the conformation and structure of bovine beta lactoglobulin-A, (Blg-A) in 50 mM sodium chloride solution at 27 degrees C using isothermal titration calorimetry (ITC), circular dichroism (CD) and fluorescence spectroscopy. There is a set of six identical and independent binding sites for Cr(+3) by a dissociation binding constant of 124 microM and the molar enthalpy of binding -17.8 kJ/mol. Circular dichroism studies do not show any significant change in the secondary structure of the protein after the binding of chromium ion on the Blg-A. Fluorescence spectroscopy studies do not show any considerable change in the tertiary structure of Blg-A due to the increasing of Cr(+3) in low concentration. However, occupation of fourth and fifth binding sites for chromium ions induce partially unfolding in the tertiary structure of the protein resulted from solvent - exposed hydrophobic patches on BLG-A.
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Affiliation(s)
- A Divsalar
- Institute of Biochemistry and Biophysics, University of Tehran, Iran
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50
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Moosavi-Movahedi AA, Gharanfoli M, Jalili S, Ahmad F, Chamani J, Hakimelahi GH, Sadeghi M, Amani M, Saboury AA. The Correlation of RNase A Enzymatic Activity with the Changes in the Distance between Nε2-His12 and Nδ1-His119 Upon Addition of Stabilizing and Destabilizing Salts. Protein J 2006; 25:117-25. [PMID: 16862454 DOI: 10.1007/s10930-006-0003-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2005] [Indexed: 11/29/2022]
Abstract
The effect of stabilizing and destabilizing salts on the catalytic behavior of ribonuclease A (RNase A) was investigated at pH 7.5 and 25 degrees C, using spectrophotometric, viscometric and molecular dynamic methods. The changes in the distance between N(epsilon2) of His(12) and N(delta1) of His(119) at the catalytic center of RNase A upon the addition of sodium sulfate, sodium hydrogen sulfate and sodium thiocyanate were evaluated by molecular dynamic methods. The compactness and expansion in terms of Stokes radius of RNase A upon the addition of sulfate ions as kosmotropic salts, and thiocyanate ion as a chaotropic salt, were estimated by viscometric measurements. Enzyme activity was measured using cytidine 2', 3'-cyclic monophosphate as a substrate. The results from the measurements of distances between N(epsilon2) of His(12) and N(delta1) of His(119) and Stokes radius suggest (i) that the presence of sulfate ions decreases the distance between the catalytic His residues and increases the globular compactness, and (ii) that there is an expansion of the enzyme surface as well as elongation of the catalytic center in the presence of thiocyanate ion. These findings are in agreement with activity measurements.
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