1
|
Ramezani M, Hesami MD, Rafiei Y, Ghareghozloo ER, Meratan AA, Nikfarjam N. Efficient Amyloid Fibrillation Inhibition and Remodeling of Preformed Fibrils of Bovine Insulin by Propolis Polyphenols-Based Nanosheets. ACS APPLIED BIO MATERIALS 2021; 4:3547-3560. [DOI: 10.1021/acsabm.1c00068] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Mohammad Ramezani
- Department of Biological Sciences, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan 45137-66731, Iran
| | - Maryam Dehghan Hesami
- Department of Biological Sciences, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan 45137-66731, Iran
| | - Yasin Rafiei
- Department of Biological Sciences, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan 45137-66731, Iran
| | | | - Ali Akbar Meratan
- Department of Biological Sciences, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan 45137-66731, Iran
| | - Nasser Nikfarjam
- Department of Chemistry, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan 45137-66731, Iran
| |
Collapse
|
2
|
Ghosh R, Bharathkar SK, Kishore N. Anticancer altretamine recognition by bovine serum albumin and its role as inhibitor of fibril formation: Biophysical insights. Int J Biol Macromol 2019; 138:359-369. [DOI: 10.1016/j.ijbiomac.2019.07.093] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2019] [Revised: 07/08/2019] [Accepted: 07/13/2019] [Indexed: 01/15/2023]
|
3
|
Azami-Movahed M, Meratan AA, Ghasemi A, Ebrahim-Habibi A, Nemat-Gorgani M. Acetylation of lysine residues in apomyoglobin: Structural changes, amyloid fibrillation, and role of surface charge. Int J Biol Macromol 2018; 107:626-634. [DOI: 10.1016/j.ijbiomac.2017.09.040] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2017] [Revised: 09/11/2017] [Accepted: 09/13/2017] [Indexed: 12/21/2022]
|
4
|
Roqanian S, Meratan AA, Ahmadian S, Shafizadeh M, Ghasemi A, Karami L. Polyphenols protect mitochondrial membrane against permeabilization induced by HEWL oligomers: Possible mechanism of action. Int J Biol Macromol 2017; 103:709-720. [PMID: 28545969 DOI: 10.1016/j.ijbiomac.2017.05.130] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Revised: 05/16/2017] [Accepted: 05/22/2017] [Indexed: 01/08/2023]
Abstract
Increasing body of evidence suggests that polyphenols frequently interacting with amyloid aggregates and/or interfering with aggregate species to bind biomembranes may serve as a therapeutic approach for the treatment of amyloid-related diseases. Hence, in the present study, the possible effects of three naturally occurring polyphenols including Curcumin, Quercetin, and Resveratrol on mitochondrial membrane permeabilization induced by Hen Egg White Lysozyme (HEWL) oligomers were investigated. Our results indicated that pre-incubation of mitochondrial homogenate with polyphenols considerably inhibit membrane permeabilization in a concentration dependent manner. In parallel, HEWL oligomers, which were co-incubated with the polyphenols, showed less effectiveness on membrane permeabilization, suggesting that toxicity of oligomers was hindered. Using a range of techniques including fluorescence quenching, Nile red binding assay, zeta potential and size measurements, CD (far- and near-UV) spectroscopy, and molecular docking, we found that the polyphenols, structure-dependently, interact with and induce conformational changes in HEWL oligomers, thereby inhibit their toxicity. We proposed a mechanism by which selected polyphenols induce their protective effects through binding to mitochondria and interfering with HEWL oligomer-membrane interactions and/or by direct interaction with HEWL oligomers, induction of conformational changes, and generating far less toxic species. However, additional studies are needed to elucidate the detailed mechanisms involved.
Collapse
Affiliation(s)
- Shaqayeq Roqanian
- Institute of Biochemistry and Biophysics, University of Tehran, P.O. Box 13145-1384, 1417614411 Tehran, Iran
| | - Ali Akbar Meratan
- Department of Biological Sciences, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan, Iran.
| | - Shahin Ahmadian
- Institute of Biochemistry and Biophysics, University of Tehran, P.O. Box 13145-1384, 1417614411 Tehran, Iran.
| | - Mahshid Shafizadeh
- Institute of Biochemistry and Biophysics, University of Tehran, P.O. Box 13145-1384, 1417614411 Tehran, Iran
| | - Atiyeh Ghasemi
- Institute of Biochemistry and Biophysics, University of Tehran, P.O. Box 13145-1384, 1417614411 Tehran, Iran
| | - Leila Karami
- Department of Cell and Molecular Biology, Faculty of Biological Sciences, Kharazmi University, Tehran, Iran
| |
Collapse
|
5
|
Meratan AA, Ghasemi A, Nemat-Gorgani M. Membrane integrity and amyloid cytotoxicity: a model study involving mitochondria and lysozyme fibrillation products. J Mol Biol 2011; 409:826-38. [PMID: 21565199 DOI: 10.1016/j.jmb.2011.04.045] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2011] [Revised: 04/12/2011] [Accepted: 04/17/2011] [Indexed: 01/24/2023]
Abstract
Recent findings implicate that fibrillation products, the protein aggregates formed during the various steps leading to formation of mature fibrils, induce neurotoxicity predominantly in their intermediate oligomeric state. This has been shown to occur by increasing membrane permeability, eventually leading to cell death. Despite accumulating reports describing mechanisms of membrane permeabilization by oligomers in model membranes, studies directly targeted at characterizing the events occurring in biological membranes are rare. In the present report, we describe interaction of the original native structure, prefibrils and fibrils of hen egg white lysozyme (HEWL) with mitochondrial membranes, as an in vitro biological model, with the aim of gaining insight into possible mechanism of cytotoxicity at the membrane level. These structures were first characterized using a range of techniques, including fluorescence, size-exclusion chromatography, dynamic light scattering, transmission electron microscopy, dot blot analysis and circular dichroism. HEWL oligomers were found to be flexible/hydrophobic structures with the capacity to interact with mitochondrial membranes. Possible permeabilization of mitochondria was explored utilizing sensitive fluorometric and luminometric assays. Results presented demonstrate release of mitochondrial enzymes upon exposure to HEWL oligomers, but not native enzyme monomer or mature fibrils, in a concentration-dependent manner. Release of cytochrome c was also observed, as reported earlier, and membrane stabilization promoted by addition of calcium prevented release. Moreover, the oligomer-membrane interaction was influenced by high concentrations of NaCl and spermine. The observed release of proteins from mitochondria is suggested to occur by a nonspecific perturbation mechanism.
Collapse
Affiliation(s)
- Ali Akbar Meratan
- Institute of Biochemistry and Biophysics, University of Tehran, P.O. Box 13145-1384, 1417614411 Tehran, Iran
| | | | | |
Collapse
|
6
|
Rezaei-Ghaleh N, Ramshini H, Ebrahim-Habibi A, Moosavi-Movahedi AA, Nemat-Gorgani M. Thermal aggregation of α-chymotrypsin: Role of hydrophobic and electrostatic interactions. Biophys Chem 2008; 132:23-32. [DOI: 10.1016/j.bpc.2007.10.001] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2007] [Revised: 09/30/2007] [Accepted: 10/01/2007] [Indexed: 10/22/2022]
|
7
|
Karmodiya K, Surolia N. Analyses of co-operative transitions in Plasmodium falciparum beta-ketoacyl acyl carrier protein reductase upon co-factor and acyl carrier protein binding. FEBS J 2006; 273:4093-103. [PMID: 16934037 DOI: 10.1111/j.1742-4658.2006.05412.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
The type II fatty acid synthase pathway of Plasmodium falciparum is a validated unique target for developing novel antimalarials because of its intrinsic differences from the type I pathway operating in humans. beta-Ketoacyl-acyl carrier protein reductase is the only enzyme of this pathway that has no isoforms and thus selective inhibitors can be developed for this player of the pathway. We report here intensive studies on the direct interactions of Plasmodiumbeta-ketoacyl-acyl carrier protein reductase with its cofactor, NADPH, acyl carrier protein, acetoacetyl-coenzyme A and other ligands in solution, by monitoring the intrinsic fluorescence (lambdamax 334 nM) of the protein as a result of its lone tryptophan, as well as the fluorescence of NADPH (lambdamax 450 nM) upon binding to the enzyme. Binding of the reduced cofactor makes the enzyme catalytically efficient, as it increases the binding affinity of the substrate, acetoacetyl-coenzyme A, by 16-fold. The binding affinity of acyl carrier protein to the enzyme also increases by approximately threefold upon NADPH binding. Plasmodiumbeta-ketoacyl-acyl carrier protein reductase exhibits negative, homotropic co-operative binding for NADPH, which is enhanced in the presence of acyl carrier protein. Acyl carrier protein increases the accessibility of NADPH to beta-ketoacyl-acyl carrier protein reductase, as evident from the increase in the accessibility of the tryptophan of beta-ketoacyl-acyl carrier protein reductase to acrylamide, from 81 to 98%. In the presence of NADP+, the reaction proceeds in the reverse direction (Ka=23.17 microM-1). These findings provide impetus for exploring the influence of ligands on the structure-activity relationship of Plasmodiumbeta-ketoacyl-acyl carrier protein reductase.
Collapse
Affiliation(s)
- Krishanpal Karmodiya
- Molecular Biology and Genetics Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore, India
| | | |
Collapse
|
8
|
Liu Y, Wu Y, Xu C. Elimination of polarity in the carotenoid terminus promotes the exposure of B850-binding sites (Tyr 44, 45) and ANS-mediated energy transfer in LH2 complexes of Rhodobacter sphaeroides. Biochem Biophys Res Commun 2004; 325:600-4. [PMID: 15530435 DOI: 10.1016/j.bbrc.2004.10.067] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2004] [Indexed: 11/27/2022]
Abstract
Carotenoids in the peripheral light-harvesting complexes (LH2) of the green mutant (GM309) of Rhodobacter sphaeroides were identified as containing neurosporenes, which lack the polar CH(3)O group, compared to spheroidenes in native-LH2 of R. sphaeroides 601. After LH2 complexes were treated with 1-anilino-8-naphthalene sulfonate (ANS), new energy transfer pathways from ANS or tryptophan to carotenoids were discovered in both native- and GM309-LH2. The carotenoid fluorescence intensity of GM309-LH2 was greater than that of native-LH2 when bound with ANS, suggesting that the elimination of polarity in the neurosporene increases the energy transfer from ANS to carotenoid. The fact that two alpha-tyrosines (alpha-Tyr 44, 45, B850-binding sites) in each alpha-apoprotein of GM309-LH2 were more easily modified than those of native-LH2 by N-acetylimidazole (NAI) indicates that the elimination of polarity in the neurosporene terminus increases the exposure of these sites to solution.
Collapse
Affiliation(s)
- Yuan Liu
- Shanghai Institute of Plant Physiology, Shanghai institute for Biological Sciences, Chinese Academy of Science, Shanghai 200032, PR China
| | | | | |
Collapse
|
9
|
Levi V, Rossi JPFC, Castello PR, González Flecha FL. Quantitative analysis of membrane protein-amphiphile interactions using resonance energy transfer. Anal Biochem 2003; 317:171-9. [PMID: 12758255 DOI: 10.1016/s0003-2697(03)00132-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
This work describes a simple method for determining the association constant of amphiphiles to membrane proteins. The method uses a fluorescent phospholipid probe, which senses the competition among unlabeled amphiphiles for positions on the transmembrane surface of the protein. The contact between the probe and the protein surface is detected through resonance energy transfer. We have analyzed theoretically this process deriving a general equation for the dependence of the energy transfer efficiency on the composition of the micelles/bilayers in which the protein is inserted. This equation includes an exchange constant for each amphiphile, which gives a measure of its affinity for the protein with respect to that of an amphiphile set as the reference. We applied this method to determine the exchange constant of different phospholipids for the plasma membrane calcium pump.
Collapse
Affiliation(s)
- Valeria Levi
- Instituto de Química y Fisicoquímica Biológicas, Departamento de Química Biológica, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Junín 956, Buenos Aires C1113AAD, Argentina
| | | | | | | |
Collapse
|
10
|
Frank J, Zouni A, van Hoek A, Visser AJ, Clarke RJ. Interaction of the fluorescent probe RH421 with ribulose-1,5-bisphosphate carboxylase/oxygenase and with Na+,K(+)-ATPase membrane fragments. BIOCHIMICA ET BIOPHYSICA ACTA 1996; 1280:51-64. [PMID: 8634316 DOI: 10.1016/0005-2736(95)00277-4] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Fluorescence titrations have shown that the voltage-sensitive probe RH421 interacts with the water-soluble protein ribulose-1,5-bisphosphate carboxylase/oxygenase and with Na+,K(+)-ATPase membrane fragments. The probe exhibits significantly different fluorescence excitation spectra in pure lipid and pure protein environments. Experiments with a range of polyamino acids showed interactions of the probe with tyrosine, lysine and arginine residues. At saturating RH421 concentrations (> or = microM) the probe quenches 60-75% of the total tryptophan fluorescence of the Na+,K(+)-ATPase preparation. Inhibition of the hydrolytic activity of the Na+,K(+)-ATPase occurs at RH421 concentrations in the micromolar range. This may be due to a probe-induced change in membrane fluidity. The sensitivity of the probe towards conformational changes of the Na+,K(+)-ATPase decreases hyperbolically as one increases the probe concentration. The decrease in sensitivity correlates well with association of the probe in the vicinity of membrane protein, as measured by tryptophan quenching. These results have important practical consequences for the application of RH421 as a voltage indicator in membrane preparations. Based on these and previously reported results, the fluorescent response of RH421 to the ATP-induced conformational change of the Na+,K+-ATPase is consistent with either a redistribution of dye from the liquid-crystalline lipid matrix into the vicinity of membrane protein or a reorganisation of the lipids surrounding the protein into a more rigid structure caused by the conformational change of the protein.
Collapse
Affiliation(s)
- J Frank
- Department of Physical Chemistry, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin, Germany
| | | | | | | | | |
Collapse
|
11
|
Demchenko AP, Apell HJ, Stürmer W, Feddersen B. Fluorescence spectroscopic studies on equilibrium dipole-relaxational dynamics of Na,K-ATPase. Biophys Chem 1993; 48:135-47. [PMID: 8298052 DOI: 10.1016/0301-4622(93)85005-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Intramolecular dynamics in Na,K-ATPase molecules have been studied by ultraviolet fluorescence spectroscopic methods: determination of temperature-dependent shifts in steady-state spectra, site-selective red-edge effects and their temperature dependence, and time-resolved emission decay as a function of excitation and emission wavelengths. The combination of these methods allows the characterization of the dipolar-relaxational mobility in the environment of the tryptophan residues. Our results show that the mean dipolar-relaxational time is of the order of one nanosecond at room temperature. This is much faster than what is usually observed in globular proteins. The fast dynamics of the protein dipoles are rapid enough so that the dipoles are in dielectric equilibrium during the slower ion transfer processes; this may have important functional consequences.
Collapse
Affiliation(s)
- A P Demchenko
- Department of Biology, University of Konstanz, Germany
| | | | | | | |
Collapse
|
12
|
Robinson JD, Pratap PR. Indicators of conformational changes in the Na+/K(+)-ATPase and their interpretation. BIOCHIMICA ET BIOPHYSICA ACTA 1993; 1154:83-104. [PMID: 8389590 DOI: 10.1016/0304-4157(93)90018-j] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- J D Robinson
- Department of Pharmacology State University of New York Health Science Center, Syracuse 13210
| | | |
Collapse
|
13
|
Chapter 1 Na, K-ATPase, structure and transport mechanism. ACTA ACUST UNITED AC 1992. [DOI: 10.1016/s0167-7306(08)60063-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
|
14
|
Pawagi AB, Deber CM. Ligand-dependent quenching of tryptophan fluorescence in human erythrocyte hexose transport protein. Biochemistry 1990; 29:950-5. [PMID: 2340286 DOI: 10.1021/bi00456a015] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
D-Glucose transport by the 492-residue human erythrocyte hexose transport protein may involve ligand-mediated conformational/positional changes. To examine this possibility, hydrophilic quencher molecules [potassium iodide and acrylamide (ACR)] were used to monitor the quenching of the total protein intrinsic fluorescence exhibited by the six protein tryptophan (Trp) residues in the presence and absence of substrate D-glucose, and in the presence of the inhibitors maltose and cytochalasin B. Protein fluorescence was found to be quenched under various conditions, ca. 14-24% by KI and ca. 25-33% by ACR, indicating that the bulk of the Trp residue population occurs in normally inaccessible hydrophobic regions of the erythrocyte membrane. However, in the presence of D-glucose, quenching by KI and ACR decreased an average of -3.4% and -4.4%, respectively; Stern-Volmer plots displayed decreased slopes in the presence of D-glucose, confirming the relatively reduced quenching. In contrast, quenching efficiency increased in the presence of maltose (+5.9%, +3.3%), while addition of cytochalasin B had no effect on fluorescence quenching. The overall results are interpreted in terms of ligand-activated movement of an initially aqueous-located protein segment containing a Trp residue into, or toward, the cellular membrane. Relocation of this segment, in effect, opens the D-glucose channel; maltose and cytochalasin B would thus inhibit transport by mechanisms which block this positional change. Conformational and hydropathy analyses suggested that the region surrounding Trp-388 is an optimal "dynamic segment" which, in response to ligand activation, could undergo the experimentally deduced aqueous/membrane domain transfer.
Collapse
Affiliation(s)
- A B Pawagi
- Research Institute, Hospital for Sick Children, Toronto, Ontario, Canada
| | | |
Collapse
|
15
|
Yang CC, Chang LS. Assessment of the role of tryptophan residues in phospholipase A2 by fluorescence quenching. Int J Biol Macromol 1989; 11:13-6. [PMID: 2489051 DOI: 10.1016/0141-8130(89)90032-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Tryptophan (Trp) fluorescence of two phospholipases A2 (PLA2) from Naja naja atra and Naja nigricollis snake venoms was quenched by acrylamide and iodide. Trp residues in N. naja atra PLA2 were equally accessible to acrylamide and iodide. Iodide quenching studies indicate that there are two classes of Trp fluorophores in N. nigricollis CMS-9. The accessible class consists of Trp-18 and Trp-19. Removal of the N-terminal octapeptide caused a perturbation of the micro-environment of the Trp residues in the PLA2 enzymes. The presence of a substrate lowers the susceptibility of the Trp residues to iodide quenching in N. naja atra PLA2, suggesting that all three Trp residues are at the substrate binding site, but in N. nigricollis CMS-9 Trp-18 and Trp-19 are related to substrate binding.
Collapse
Affiliation(s)
- C C Yang
- Institute of Life Sciences, National Tsing Hua University, Hsinchu, Taiwan, Republic of China
| | | |
Collapse
|
16
|
Jørgensen PL, Andersen JP. Structural basis for E1-E2 conformational transitions in Na,K-pump and Ca-pump proteins. J Membr Biol 1988; 103:95-120. [PMID: 3054114 DOI: 10.1007/bf01870942] [Citation(s) in RCA: 259] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- P L Jørgensen
- Danish Biotechnology Research Center for Membrane Proteins, Aarhus University, Demark
| | | |
Collapse
|