1
|
Gajardo-Parra N, Meneses L, Duarte ARC, Paiva A, Held C. Assessing the Influence of Betaine-Based Natural Deep Eutectic Systems on Horseradish Peroxidase. ACS SUSTAINABLE CHEMISTRY & ENGINEERING 2022; 10:12873-12881. [PMID: 36573121 PMCID: PMC9783073 DOI: 10.1021/acssuschemeng.2c04045] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2022] [Revised: 08/26/2022] [Indexed: 06/02/2023]
Abstract
To validate the use of horseradish peroxidase (HRP) in natural deep eutectic systems (NADES), five different betaine-based NADES were characterized in terms of water content, water activity, density, and viscosity experimentally and by thermodynamic modeling. The results show that the NADES under study have a water activity of about 0.4 at 37 °C for water contents between 14 and 22 wt %. The densities of the studied NADES had values between 1.2 and 1.3 g.cm-3 at 20 °C. The density was modeled with a state-of-the-art equation of state; an excellent agreement with the experimental density data was achieved, allowing reasonable predictions for water activities. The system betaine:glycerol (1:2) was found to be the most viscous with a dynamic viscosity of ∼600 mPa.s at 40 °C, while all the other systems had viscosities <350 mPa.s at 40 °C. The impact of the NADES on the enzymatic activity, as well as on, conformational and thermal stability was assessed. The system betaine/sorbitol:water (1:1:3) showed the highest benefit for enzymatic activity, increasing it by two-folds. Moreover, upon NADES addition, thermal stability was increased followed by an increment in a-helix secondary structure content.
Collapse
Affiliation(s)
- Nicolás
F. Gajardo-Parra
- Laboratory
of Thermodynamics, Department of Biochemical and Chemical Engineering, TU Dortmund University, Emil-Figge-Str. 70, 44227 Dortmund, Germany
| | - Liane Meneses
- LAQV-REQUIMTE,
Department of Chemistry, School of Science and Technology, NOVA University Lisbon, 2825-149 Caparica, Portugal
| | - Ana Rita C. Duarte
- LAQV-REQUIMTE,
Department of Chemistry, School of Science and Technology, NOVA University Lisbon, 2825-149 Caparica, Portugal
| | - Alexandre Paiva
- LAQV-REQUIMTE,
Department of Chemistry, School of Science and Technology, NOVA University Lisbon, 2825-149 Caparica, Portugal
| | - Christoph Held
- Laboratory
of Thermodynamics, Department of Biochemical and Chemical Engineering, TU Dortmund University, Emil-Figge-Str. 70, 44227 Dortmund, Germany
| |
Collapse
|
2
|
Wang J, Yao M, Bai G, Liu J, Wang Y. Inhibition of horseradish peroxidase activity through conformational change in surfactant solution. J SURFACTANTS DETERG 2022. [DOI: 10.1002/jsde.12589] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Jiuxia Wang
- School of Chemistry and Chemical Engineering Henan Institute of Science and Technology Xinxiang Henan People's Republic of China
- Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering Henan Normal University Xinxiang Henan People's Republic of China
| | - Meihuan Yao
- Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering Henan Normal University Xinxiang Henan People's Republic of China
| | - Guangyue Bai
- Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering Henan Normal University Xinxiang Henan People's Republic of China
| | - Junling Liu
- Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering Henan Normal University Xinxiang Henan People's Republic of China
| | - Yujie Wang
- School of Chemistry and Chemical Engineering Henan Institute of Science and Technology Xinxiang Henan People's Republic of China
| |
Collapse
|
3
|
Belluati A, Craciun I, Liu J, Palivan CG. Nanoscale Enzymatic Compartments in Tandem Support Cascade Reactions in Vitro. Biomacromolecules 2018; 19:4023-4033. [DOI: 10.1021/acs.biomac.8b01019] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Andrea Belluati
- Department of Chemistry, University of Basel, Mattenstrasse 24a, CH-4058 Basel, Switzerland
| | - Ioana Craciun
- Department of Chemistry, University of Basel, Mattenstrasse 24a, CH-4058 Basel, Switzerland
| | - Juan Liu
- Department of Chemistry, University of Basel, Mattenstrasse 24a, CH-4058 Basel, Switzerland
| | - Cornelia G. Palivan
- Department of Chemistry, University of Basel, Mattenstrasse 24a, CH-4058 Basel, Switzerland
| |
Collapse
|
4
|
Wright TA, Stewart JM, Page RC, Konkolewicz D. Extraction of Thermodynamic Parameters of Protein Unfolding Using Parallelized Differential Scanning Fluorimetry. J Phys Chem Lett 2017; 8:553-558. [PMID: 28067526 DOI: 10.1021/acs.jpclett.6b02894] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Thermodynamic properties of protein unfolding have been extensively studied; however, the methods used have typically required significant preparation time and high protein concentrations. Here we present a facile, simple, and parallelized differential scanning fluorimetry (DSF) method that enables thermodynamic parameters of protein unfolding to be extracted. This method assumes a two-state, reversible protein unfolding mechanism and provides the capacity to quickly analyze the biophysical mechanisms of changes in protein stability and to more thoroughly characterize the effect of mutations, additives, inhibitors, or pH. We show the utility of the DSF method by analyzing the thermal denaturation of lysozyme, carbonic anhydrase, chymotrypsin, horseradish peroxidase, and cellulase enzymes. Compared with similar biophysical analyses by circular dichroism, DSF allows for determination of thermodynamic parameters of unfolding while providing greater than 24-fold reduction in experimental time. This study opens the door to rapid characterization of protein stability on low concentration protein samples.
Collapse
Affiliation(s)
- Thaiesha A Wright
- Department of Chemistry and Biochemistry, Miami University , Oxford, Ohio 45056, United States
| | - Jamie M Stewart
- Department of Chemistry and Biochemistry, Miami University , Oxford, Ohio 45056, United States
| | - Richard C Page
- Department of Chemistry and Biochemistry, Miami University , Oxford, Ohio 45056, United States
| | - Dominik Konkolewicz
- Department of Chemistry and Biochemistry, Miami University , Oxford, Ohio 45056, United States
| |
Collapse
|
5
|
O. Nwamba C, C. Chilaka F, Akbar Moosavi-Movahedi A. Cation modulation of hemoglobin interaction with sodium n-dodecyl sulphate (SDS) iv: magnesium modulation at pH 7.20. AIMS BIOPHYSICS 2016. [DOI: 10.3934/biophy.2016.1.146] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
|
6
|
Kinetic Analysis of Guanidine Hydrochloride Inactivation of β-Galactosidase in the Presence of Galactose. Enzyme Res 2012; 2012:173831. [PMID: 23008759 PMCID: PMC3449116 DOI: 10.1155/2012/173831] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2012] [Revised: 07/28/2012] [Accepted: 07/29/2012] [Indexed: 12/03/2022] Open
Abstract
Inactivation of purified β-Galactosidase was done with GdnHCl in the absence and presence of varying [galactose] at 50°C and at pH 4.5. Lineweaver-Burk plots of initial velocity data, in the presence and absence of guanidine hydrochloride (GdnHCl) and galactose, were used to determine the relevant Km and Vmax values, with p-nitrophenyl β-D-galactopyranoside (pNPG) as substrate, S. Plots of ln([P]∞ − [P]t) against time in the presence of GdnHCl yielded the inactivation rate constant, A. Plots of A versus [S] at different galactose concentrations were straight lines that became increasingly less steep as the [galactose] increased, showing that A was dependent on [S]. Slopes and intercepts of the 1/[P]∞ versus 1/[S] yielded k+0
and k'+0, the microscopic rate constants for the free enzyme and the enzyme-substrate complex, respectively. Plots of k+0
and k'+0 versus [galactose] showed that galactose protected the free enzyme as well as the enzyme-substrate complex (only at the lowest and highest [galactose]) against GdnHCl inactivation. In the absence of galactose, GdnHCl exhibited some degree of non-competitive inhibition. In the presence of GdnHCl, galactose exhibited competitive inhibition at the lower [galactose] of 5 mM which changed to non-competitive as the [galactose] increased. The implications of our findings are further discussed.
Collapse
|
7
|
Misra PP, Kishore N. Biophysical analysis of partially folded state of α-lactalbumin in the presence of cationic and anionic surfactants. J Colloid Interface Sci 2011; 354:234-47. [DOI: 10.1016/j.jcis.2010.10.015] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2010] [Revised: 10/04/2010] [Accepted: 10/05/2010] [Indexed: 10/19/2022]
|
8
|
Cation Modulation of Hemoglobin Interaction with Sodium n-Dodecyl Sulfate (SDS). I: Calcium Modulation at pH 7.20. Cell Biochem Biophys 2010; 60:187-97. [DOI: 10.1007/s12013-010-9139-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
9
|
Chamani J. Energetic domains analysis of bovine α-lactalbumin upon interaction with copper and dodecyl trimethylammonium bromide. J Mol Struct 2010. [DOI: 10.1016/j.molstruc.2010.06.035] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
10
|
Guerrero-Mendiola C, Oria-Hernández J, Ramírez-Silva L. Kinetics of the thermal inactivation and aggregate formation of rabbit muscle pyruvate kinase in the presence of trehalose. Arch Biochem Biophys 2009; 490:129-36. [PMID: 19703407 DOI: 10.1016/j.abb.2009.08.012] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2009] [Revised: 08/19/2009] [Accepted: 08/19/2009] [Indexed: 11/29/2022]
Abstract
In a previous study we found that 30-40% dimethylsulfoxide induces the active conformation of rabbit muscle pyruvate kinase. Because dimethylsulfoxide is known to perturb structure and function of many proteins, we have explored the effect of trehalose on the kinetics of thermal inactivation and stability of pyruvate kinase; this is because trehalose, in contrast to dimethyl sulfoxide, is totally excluded from the hydration shell of proteins. The results show that 600 mM trehalose inhibits the activity of pyruvate kinase by about 20% at 25 degrees C, however, trehalose protects pyruvate kinase from thermal inactivation at 60 degrees C, increases the Tm(app) of unfolding by 7.2 degrees C, induces a more compact state, and stabilizes its tetrameric structure. The inactivation process is irreversible due to the formation of protein aggregates. Trehalose diminishes the rate of formation of intermediates with propensity to aggregate, but does not affect the extent of aggregation. Remarkably, trehalose affects the aggregation process by inducing aggregates with amyloid-like characteristics.
Collapse
Affiliation(s)
- Carlos Guerrero-Mendiola
- Departamento de Bioquímica, Facultad de Medicina, Apartado Postal 70-159, Universidad Nacional Autónoma de México, 04510 México, DF, Mexico
| | | | | |
Collapse
|
11
|
Mojtahedi M, Parastar H, Jalali-Heravi M, Chamani J, Chilaka F, Moosavi-Movahedi A. Comparison between two different hemichromes of hemoglobins (HbA and HbS) induced by n-dodecyl trimethylammonium bromide: Chemometric study. Colloids Surf B Biointerfaces 2008; 63:183-91. [DOI: 10.1016/j.colsurfb.2007.11.018] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2007] [Revised: 11/12/2007] [Accepted: 11/29/2007] [Indexed: 12/01/2022]
|
12
|
A Comparative Study of the Direct Calorimetric Determination of the Denaturation Enthalpy for Lysozyme in Sodium Dodecyl Sulfate and Dodecyltrimethylammonium Bromide Solutions. J SOLUTION CHEM 2008. [DOI: 10.1007/s10953-008-9267-1] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
13
|
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] [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.
Collapse
Affiliation(s)
- G Rezaei Behbehani
- Chemistry Department, Imam Khomeini International University, Qazvin, Iran.
| | | | | |
Collapse
|
14
|
Rezaei Tavirani M, Moghaddamnia SH, Ranjbar B, Amani M, Marashi SA. Conformational study of human serum albumin in pre-denaturation temperatures by differential scanning calorimetry, circular dichroism and UV spectroscopy. BMB Rep 2006; 39:530-6. [PMID: 17002873 DOI: 10.5483/bmbrep.2006.39.5.530] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Thermal conformational changes of human serum albumin (HSA) in phosphate buffer, 10 mM at pH = 7 are investigated using differential scanning calorimetric (DSC), circular dichroism (CD) and UV spectroscopic methods. The results indicate that temperature increment from 25 degrees C to 55 degrees C induces reversible conformational changes in the structure of HSA. Conformational change of HSA are shown to be a three-step process. Interestingly, melting temperature of the last domain is equal to the maximum value of fever in pathological conditions, i.e. 42 degrees C. These conformational alterations are accompanied by a mild alteration of secondary structures. Study of HSA-SDS (sodium dodecyl sulphate) interaction at 45 degrees C and 35 degrees C reveals that SDS affects the HSA structure at least in three steps: the first two steps result in more stabilization and compactness of HSA structure, while the last one induces the unfolding of HSA. Since HSA has a more affinity for SDS at 45 degrees C compared to 35 degrees C, It is suggested that the net negative charge of HSA is decreased in fever, which results in the decrease of HSA-associated cations and plasma osmolarity, and consequently, heat removal via the increase in urine volume.
Collapse
|
15
|
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] [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.
Collapse
Affiliation(s)
- P Pirzadeh
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran
| | | | | | | | | | | |
Collapse
|
16
|
Gheibi N, Saboury AA, Haghbeen K, Moosavi-Movahedi AA. The effect of some osmolytes on the activity and stability of mushroom tyrosinase. J Biosci 2006; 31:355-62. [PMID: 17006018 DOI: 10.1007/bf02704108] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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.
Collapse
Affiliation(s)
- N Gheibi
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran
| | | | | | | |
Collapse
|
17
|
Liu TQ, Guo R. Influence of Low Cetyltrimethylammonium Bromide Concentration on the Interactions and Properties of Hemoglobin with Acyclovir. CHINESE J CHEM 2006. [DOI: 10.1002/cjoc.200690119] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
18
|
Divsalar A, Saboury AA, Moosavi-Movahedi AA, Mansoori-Torshizi H. Comparative analysis of refolding of chemically denatured β-lactoglobulin types A and B using the dilution additive mode. Int J Biol Macromol 2006; 38:9-17. [PMID: 16417918 DOI: 10.1016/j.ijbiomac.2005.12.010] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2005] [Revised: 12/11/2005] [Accepted: 12/12/2005] [Indexed: 11/19/2022]
Abstract
The kinetic refolding of beta-lactoglobulin (BLG), types A and B, by beta-cyclodextrin, glucose and sorbitol has been investigated in aqueous solution using fluorescence, far UV-CD and UV-spectrophotometric techniques. A new Pd-complex has been used to denature the protein. CD and fluorescence studies indicated that when incubated with sugar, the denatured BLG is refolded into the native-like structure through the dilution additive mode resulting in a higher yield of active protein than without sugar. CD studies show that these sugars can induce a non-native alpha-helical structure in denatured BLG-A and -B, then aid in the refolding of the protein. Based on the present study, these sugars have a different effect on BLG-A than BLG-B because of their differences in protein thermal stability. BLG-A has a higher thermal stability than BLG-B due to differences in the amino acid sequences.
Collapse
Affiliation(s)
- A Divsalar
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran
| | | | | | | |
Collapse
|
19
|
Saboury AA, Atri MS, Sanati MH, Moosavi-Movahedi AA, Hakimelahi GH, Sadeghi M. A thermodynamic study on the interaction between magnesium ion and human growth hormone. Biopolymers 2006; 81:120-6. [PMID: 16208769 DOI: 10.1002/bip.20386] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
A thermodynamic study on the interaction between magnesium ion and human growth hormone (hGH) was studied at 27 degrees C in NaCl solution (50 mM) using different techniques. Two techniques of ionmetry using a Mg2+selective membrane electrode and isothermal titration calorimetry were applied to obtain the binding isotherm for hGHMg2+; results obtained by both techniques were found to be in good agreement. There is a set of three identical and noninteracting binding sites for magnesium ions. The intrinsic dissociation equilibrium constant and the molar enthalpy of binding are 46 microM and -17.7 kJ/mol, respectively. Temperature scanning UV-visible spectroscopy was applied to elucidate the effect of Mg2+ binding on the protein stability, and circular dichroism (CD) spectroscopy was used to show the structural change of hGH due to the metal ion interaction. Magnesium ion binding increased the protein thermal stability by increasing the alpha-helix content as well as decreasing both beta and random coil structures. However, the secondary structural change of the protein returns to its native form, including a small change in the tertiary structure, in high concentrations of magnesium ion.
Collapse
Affiliation(s)
- A A Saboury
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran.
| | | | | | | | | | | |
Collapse
|
20
|
Chamani J, Moosavi-Movahedi AA. Effect of n-alkyl trimethylammonium bromides on folding and stability of alkaline and acid-denatured cytochrome c: a spectroscopic approach. J Colloid Interface Sci 2005; 297:561-9. [PMID: 16338232 DOI: 10.1016/j.jcis.2005.11.035] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2005] [Revised: 11/11/2005] [Accepted: 11/12/2005] [Indexed: 11/16/2022]
Abstract
The molten globule (MG) state can be an intermediate in the protein folding pathway; thus, its detailed description can help understanding protein folding. Alkyl trimethylammonium bromides including dodecyl trimethylammonium bromide, DTAB; tetradecyl trimethylammonium bromide, TTAB; and hexadecyl trimethylammonium bromide, HTAB; cationic surfactants that are commonly used to mimic hydrophobic binding environments such as cell membranes, are known to denature some native state proteins, including horse cytochrome c (cyt c). In this article, refolding of alkaline and acid-denatured cyt c are studied under the influence of n-alkyl trimethylammonium bromides to form MG-like states at both low concentration (pH 11) and above the critical micelle concentration (pH 2) using ultraviolet and visible absorption, fluorescence and circular dichroism (CD). The addition of n-alkyl trimethylammonium bromides to the unfolded state of cyt c in alkaline and acidic condition appears to support the stabilized form of the MG state. The m-values of the refolded state of cyt c by DTAB, TTAB and HTAB showed substantial variation. The enhancement of m-values as the stability criterion of the MG state corresponded with increasing chain length of the cited n-alkyl trimethylammonium bromides. Based on the results obtained, the merits of two models of the protein-surfactant structure are discussed for various n-alkyl trimethylammonium bromides concentration in inducing the MG state at two different pH conditions. Therefore, hydrophobic interactions play a dominant role in stabilizing the MG state.
Collapse
Affiliation(s)
- J Chamani
- Department of Biology, Faculty of Science, Islamic Azad University-Mashhad Branch, Mashhad, Iran.
| | | |
Collapse
|
21
|
Nazari K, Mahmoudi A, Shahrooz M, Khodafarin R, Moosavi-Movahedi AA. Suicide-peroxide inactivation of horseradish peroxidase in the presence of sodium n-dodecyl sulphate: a study of the enzyme deactivation kinetics. J Enzyme Inhib Med Chem 2005; 20:285-92. [PMID: 16119200 DOI: 10.1080/14756360500042846] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
Abstract
In the presence of the anionic surfactant sodium n-dodecyl sulphate (SDS), horseradish peroxidase (HRP) undergoes a deactivation process. Suicide inactivation of horseradish peroxidase by hydrogen peroxide(3 mM) was monitored by the absorbance change in product formation in the catalytic reaction cycle. The progress curve of the catalytic reaction cycle was obtained at 27degrees C and phosphate buffer 2.5 mM (pH = 7.0). The corresponding kinetic parameters i.e., intact enzyme activity (alpha i); the apparent rate constant of suicide inactivation by peroxide (ki); and the apparent rate constants of enzyme deactivation by surfactant (kd) were evaluated from the obtained kinetic equations. The experimental data are accounted for by the equations used in this investigation. Addition of SDS to the reaction mixture intensified the inactivation process. The deactivation ability of denaturant could be resolved from the observed inactivation effect of the suicide substrate by applying the proposed model. The results indicate that the deactivation and the inactivation processes are independent of each other.
Collapse
Affiliation(s)
- K Nazari
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran
| | | | | | | | | |
Collapse
|
22
|
Saboury AA, Atri MS, Sanati MH, Moosavi-Movahedi AA, Haghbeen K. Effects of calcium binding on the structure and stability of human growth hormone. Int J Biol Macromol 2005; 36:305-9. [PMID: 16102809 DOI: 10.1016/j.ijbiomac.2005.07.003] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2005] [Revised: 07/11/2005] [Accepted: 07/11/2005] [Indexed: 11/25/2022]
Abstract
Thermodynamic analysis of calcium ions binding to human growth hormone (hGH) was done at 27 degrees C in NaCl solution, 50 mM, using different techniques. The binding isotherm for hGH-Ca2+ was obtained by two techniques of ionmetry, using a Ca(2+)-selective membrane electrode, and isothermal titration calorimetry. Results obtained by two ionmetric and calorimetric methods are in good agreement. There is a set of three identical and non-interacting binding sites for calcium ions. The intrinsic dissociation equilibrium constant and the molar enthalpy of binding are 52 microM and -17.4 kJ/mol, respectively. Temperature scanning UV-vis spectroscopy was applied to elucidate the effect of Ca2+ binding on the protein stability, and circular dichroism (CD) spectroscopy was used to show the structural change of hGH due to the metal ion interaction. Calcium ions binding increase the protein thermal stability by increasing of the alpha helix content as well as decreasing of both beta and random coil structures.
Collapse
Affiliation(s)
- A A Saboury
- Institute of Biochemistry and Biophysics, University of Tehran, Enghelab Street, Tehran 1417614411, Iran.
| | | | | | | | | |
Collapse
|
23
|
Housaindokht MR, Chamani J, Moosavi-Movahedi AA. A differential scanning calorimetric study of the influence of copper and dodecyl trimethyl ammonium bromide on the stability of bovine α-lactalbumin. Int J Biol Macromol 2005; 36:169-75. [PMID: 16019061 DOI: 10.1016/j.ijbiomac.2005.05.005] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2005] [Revised: 05/20/2005] [Accepted: 05/26/2005] [Indexed: 11/21/2022]
Abstract
Bovine alpha-lactalbumin (alpha-LA) has been studied by differential scanning calorimetry (DSC), fluorescence spectroscopy and viscometry with various concentrations of Cu2+ and DTAB to elucidate the effect of these ligands on its thermal properties. The DSC profile of dialyzed form of alpha-lactalbumin (m-alpha-LA) contrary to the undialyzed form (holo-form, h-alpha-LA) shows two temperature induced heat absorption peaks. The m-alpha-LA is not a new form of alpha-LA. It contains mixture of the apo (a-alpha-LA) and holo (h-alpha-LA) forms of alpha-LA at low and high temperatures, respectively. Therefore, these two states of alpha-LA (apo and holo) are equilibrating with together after dialyze experiment. The Cu2+ as a metal ion and DTAB as a non metal ion alter the two heat-absorption peaks, in such a manner that, the addition of Cu2+ to the m-alpha-LA increases partial molar heat capacity and enthalpy change values of the h-alpha-LA form at high temperature because the molecular population of the a-alpha-LA form changes into the h-like-alpha-LA. On the contrary, the interaction between the DTAB and the m-alpha-LA increases these thermodynamic values for the a-alpha-LA at low temperature. However, DTAB bound to m-alpha-LA prevents from Ca2+ binding to protein, because there are positive charges repulsion between them. The high temperature peak occurs at the same temperature as the unfolding of the h-alpha-LA, while the low temperature peak lies within the temperature range associated with the unfolding of the a-alpha-LA. The R(s) values of m-alpha-LA, h-alpha-LA and a-alpha-LA forms confirmed the folding and unfolding of the m-alpha-LA during the addition of Cu2+ and DTAB at different concentration, respectively.
Collapse
Affiliation(s)
- M R Housaindokht
- Department of Chemistry, Faculty of Science, Islamic Azad University of Mashhad, Mashhad, Iran
| | | | | |
Collapse
|
24
|
|
25
|
Saboury AA, Karbassi F, Haghbeen K, Ranjbar B, Moosavi-Movahedi AA, Farzami B. Stability, structural and suicide inactivation changes of Mushroom tyrosinase after acetylation by N-acetylimidazole. Int J Biol Macromol 2004; 34:257-62. [PMID: 15374682 DOI: 10.1016/j.ijbiomac.2004.06.003] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/21/2004] [Indexed: 11/21/2022]
Abstract
Modification (acetylation) of Tyr residues with N-acetylimidazole protects outstandingly mushroom tyrosinase (MT) from the suicide inactivation in the presence of its catecholic substrate, 4-[(4-methylbenzo) azo]-1,2-benzenediol. UV spectrophotometric experiments and differential scanning calorimetry (DSC) studies indicated a decrease in kinetic stability of the enzyme alongside with increase in its thermal stability as well as its stability against n-dodecyl trimethylammonium bromide as a denaturizing agent. Pace analysis resulted in standard Gibbs free energy values of 46.54 and 52.09 kJ/mol in the absence of denaturant for native and modified enzyme, respectively. Structural studies by circular dichroism (CD) spectrophotometry showed that modification did not have major impact on the secondary structure of MT; however, induced some changes in its tertiary structure. The near-UV CD results revealed that the modification had enhanced intramolecular van der Waals interactions in the enzyme structure, which was in coincidence with its thermodynamic stability.
Collapse
Affiliation(s)
- A A Saboury
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran.
| | | | | | | | | | | |
Collapse
|
26
|
Burova TV, Grinberg NV, Dubovik AS, Tanaka K, Grinberg VY, Grosberg AY. Effects of Ligand Binding on Relative Stability of Subchain Conformations of Weakly Charged N-Isopropylacrylamide Gels in Swollen and Shrunken States. Macromolecules 2003. [DOI: 10.1021/ma034719d] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Tatiana V. Burova
- N.M. Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, Vavilov St. 28, Moscow 119991, Russia; Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139; and School of Physics and Astronomy, University of Minnesota, Church St., Minneapolis, Minnesota 55455
| | - Natalia V. Grinberg
- N.M. Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, Vavilov St. 28, Moscow 119991, Russia; Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139; and School of Physics and Astronomy, University of Minnesota, Church St., Minneapolis, Minnesota 55455
| | - Alexander S. Dubovik
- N.M. Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, Vavilov St. 28, Moscow 119991, Russia; Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139; and School of Physics and Astronomy, University of Minnesota, Church St., Minneapolis, Minnesota 55455
| | - Kazunori Tanaka
- N.M. Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, Vavilov St. 28, Moscow 119991, Russia; Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139; and School of Physics and Astronomy, University of Minnesota, Church St., Minneapolis, Minnesota 55455
| | - Valerij Ya. Grinberg
- N.M. Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, Vavilov St. 28, Moscow 119991, Russia; Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139; and School of Physics and Astronomy, University of Minnesota, Church St., Minneapolis, Minnesota 55455
| | - Alexander Yu. Grosberg
- N.M. Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, Vavilov St. 28, Moscow 119991, Russia; Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139; and School of Physics and Astronomy, University of Minnesota, Church St., Minneapolis, Minnesota 55455
| |
Collapse
|
27
|
Activity, structural and stability changes of mushroom tyrosinase by sodium dodecyl sulfate. Colloids Surf B Biointerfaces 2003. [DOI: 10.1016/s0927-7765(03)00153-x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
28
|
The effect of dodecyl trimethylammonium bromide on the formation of methemoglobins and hemichrome. Colloids Surf B Biointerfaces 2002. [DOI: 10.1016/s0927-7765(02)00003-6] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
29
|
Reza DM, Akbar MMA, Parviz N, Shahrokh S. Inhibition of Human Hemoglobin Autoxidaiton by Sodium n-Dodecyl Sulphate. BMB Rep 2002; 35:364-70. [PMID: 12296994 DOI: 10.5483/bmbrep.2002.35.4.364] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The effect of sodium n-dodecyl sulphate (SDS) on hemoglobin autoxidation was studied in the presence of a 100 mM phosphate buffer (pH 7.0) by different methods. These included spectrophotometry, fluorescence technique, cyclic voltametry, differential scanning calorimetry, and densitometry. Spectroscopic studies showed that SDS concentrations up to 1 mM increased deoxy-, decreases oxy-, and had no significant effect on the met- conformation of hemoglobin. Therefore, a SDS concentration up to 1 mM increased the deoxy form of hemoglobin as the folded, compact state and decreases the oxy conformation. The turbidity measurements and differential scanning calorimetry techniques indicated a more stable conformation for hemoglobin in the presence of SDS up to 1 mM. Electrochemical studies also confirmed a more difficult oxidation under these conditions. The induction of the deoxy form in the presence of SDS was confirmed by densitometry techniques. The compact structure of deoxyhemoglobin blocks the formation of met-conformation in low SDS concentrations.
Collapse
|
30
|
Potentiometric titration and enthalpy evaluation of horseradish peroxidase in the presence of n-dodecyl trimethylammonium bromide. Colloids Surf B Biointerfaces 2000. [DOI: 10.1016/s0927-7765(99)00127-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|