1
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Stachurska K, Marcisz U, Długosz M, Antosiewicz JM. Kinetics of Structural Transitions Induced by Sodium Dodecyl Sulfate in α-Chymotrypsin. ACS OMEGA 2023; 8:49137-49149. [PMID: 38162786 PMCID: PMC10753550 DOI: 10.1021/acsomega.3c07256] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/20/2023] [Revised: 11/16/2023] [Accepted: 11/23/2023] [Indexed: 01/03/2024]
Abstract
The temporal changes in circular dichroism at 222 and 260 nm were recorded by using stopped-flow spectroscopy after mixing α-chymotrypsin solutions with sodium dodecyl sulfate solutions. Simultaneously with the circular dichroism signal, the fluorescence emission was recorded. Changes in the secondary and tertiary structures of chymotrypsin induced by sodium dodecyl sulfate are characterized by either three or four one-way reactions with relaxation amplitudes and times precisely determined by an advanced numerical procedure of Kuzmič. Quantitatively, transitions within the secondary and tertiary structures of the protein are significantly different. Moreover, changes in the tertiary structure depend on the type of recorded signal (either circular dichroism or fluorescence) and the wavelength of the incident radiation. The latter observation is particularly interesting as it indicates that the contributions of protein's different tryptophans to the total recorded fluorescence depend on the excitation wavelength. We present several results justifying this hypothesis.
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Affiliation(s)
- Karolina Stachurska
- Biophysics Division, Institute of Experimental
Physics, Faculty of Physics, University
of Warsaw, Pasteura 5 Street, 02-093 Warsaw, Poland
| | - Urszula Marcisz
- Biophysics Division, Institute of Experimental
Physics, Faculty of Physics, University
of Warsaw, Pasteura 5 Street, 02-093 Warsaw, Poland
| | - Maciej Długosz
- Biophysics Division, Institute of Experimental
Physics, Faculty of Physics, University
of Warsaw, Pasteura 5 Street, 02-093 Warsaw, Poland
| | - Jan M. Antosiewicz
- Biophysics Division, Institute of Experimental
Physics, Faculty of Physics, University
of Warsaw, Pasteura 5 Street, 02-093 Warsaw, Poland
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2
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Kumar Sahoo D, Devi Tulsiyan K, Jena S, Biswal HS. Implication of Threonine-Based Ionic Liquids on the Structural Stability, Binding and Activity of Cytochrome c. Chemphyschem 2020; 21:2525-2535. [PMID: 33022820 DOI: 10.1002/cphc.202000761] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2020] [Revised: 10/04/2020] [Indexed: 12/28/2022]
Abstract
Ionic liquids (ILs) are useful in pharmaceutical industries and biotechnology as alternative solvents or sources for protein extraction and purification, preservation of biomolecules and for regulating the catalytic activity of enzymes. However, the binding mechanism, the non-covalent forces responsible for protein-IL interactions and dynamics of proteins in IL need to be investigated in depth for the effective use of ILs as alternatives. Herein, we disclose the molecular level understanding of the structural intactness and reactivity of a model protein cytochrome c (Cyt c) in biocompatible threonine-based ILs with the help of experimental techniques such as isothermal titration calorimetry (ITC), fluorescence spectroscopy, transmission electron microscopy (TEM) as well as molecular docking. Hydrophobic and electrostatic forces are responsible for the structural and conformational integrity of Cyt c in IL. The ITC experiments revealed the Cyt c-IL binding free energies are in the range of 10-14 kJ/mol and the molecular docking studies demonstrated that ILs interact at the surfaces of Cyt c. The results look promising as the ILs used here are non-toxic and biocompatible, and thus may find potential applications in structural biology and biotechnology.
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Affiliation(s)
- Dipak Kumar Sahoo
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), PO-Bhimpur-Padanpur, Via-Jatni, District- Khurda, PIN-752050, Bhubaneswar, India.,Homi Bhaba National Institute Training School Complex, Anushakti Nagar, Mumbai, 400094, India
| | - Kiran Devi Tulsiyan
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), PO-Bhimpur-Padanpur, Via-Jatni, District- Khurda, PIN-752050, Bhubaneswar, India.,Homi Bhaba National Institute Training School Complex, Anushakti Nagar, Mumbai, 400094, India
| | - Subhrakant Jena
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), PO-Bhimpur-Padanpur, Via-Jatni, District- Khurda, PIN-752050, Bhubaneswar, India.,Homi Bhaba National Institute Training School Complex, Anushakti Nagar, Mumbai, 400094, India
| | - Himansu S Biswal
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), PO-Bhimpur-Padanpur, Via-Jatni, District- Khurda, PIN-752050, Bhubaneswar, India.,Homi Bhaba National Institute Training School Complex, Anushakti Nagar, Mumbai, 400094, India
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3
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Govind C, Paul M, Karunakaran V. Ultrafast Heme Relaxation Dynamics Probing the Unfolded States of Cytochrome c Induced by Liposomes: Effect of Charge of Phospholipids. J Phys Chem B 2020; 124:2769-2777. [DOI: 10.1021/acs.jpcb.9b11957] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Chinju Govind
- Photosciences and Photonics Section, Chemical Sciences and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology, Thiruvananthapuram 695 019, Kerala, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Megha Paul
- Photosciences and Photonics Section, Chemical Sciences and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology, Thiruvananthapuram 695 019, Kerala, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Venugopal Karunakaran
- Photosciences and Photonics Section, Chemical Sciences and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology, Thiruvananthapuram 695 019, Kerala, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
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4
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Sahoo DK, Jena S, Tulsiyan KD, Dutta J, Chakrabarty S, Biswal HS. Amino-Acid-Based Ionic Liquids for the Improvement in Stability and Activity of Cytochrome c: A Combined Experimental and Molecular Dynamics Study. J Phys Chem B 2019; 123:10100-10109. [DOI: 10.1021/acs.jpcb.9b09278] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Dipak Kumar Sahoo
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), PO-Bhimpur-Padanpur, Via-Jatni, District- Khurda, PIN - 752050, Bhubaneswar, India
- Homi Bhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai 400094, India
| | - Subhrakant Jena
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), PO-Bhimpur-Padanpur, Via-Jatni, District- Khurda, PIN - 752050, Bhubaneswar, India
- Homi Bhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai 400094, India
| | - Kiran Devi Tulsiyan
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), PO-Bhimpur-Padanpur, Via-Jatni, District- Khurda, PIN - 752050, Bhubaneswar, India
- Homi Bhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai 400094, India
| | - Juhi Dutta
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), PO-Bhimpur-Padanpur, Via-Jatni, District- Khurda, PIN - 752050, Bhubaneswar, India
- Homi Bhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai 400094, India
| | - Suman Chakrabarty
- Department of Chemical, Biological & Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, Salt Lake, Kolkata 700106, India
| | - Himansu S. Biswal
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), PO-Bhimpur-Padanpur, Via-Jatni, District- Khurda, PIN - 752050, Bhubaneswar, India
- Homi Bhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai 400094, India
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5
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Mondal A, Das M, Mazumdar S. Substitution of iron with cobalt in the prosthetic group of bacterial cytochrome P450: Effects on the stability and structure of the protein. Inorganica Chim Acta 2019. [DOI: 10.1016/j.ica.2018.12.043] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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6
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Jain R, Sharma D, Kumar R, Kumar R. Structural, kinetic and thermodynamic characterizations of SDS-induced molten globule state of a highly negatively charged cytochrome c. J Biochem 2019; 165:125-137. [PMID: 30371870 DOI: 10.1093/jb/mvy087] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2018] [Accepted: 10/26/2018] [Indexed: 11/14/2022] Open
Abstract
This study presents the structural, kinetic and thermodynamic characterizations of previously unknown submicellar concentrations of SDS-induced molten globule (MGSDS) state of a highly negatively charged base-denatured ferricytochrome c (UB-state) at pH ∼12.8 (±0.2). The far-UV CD, near-UV CD, ANS-fluorescence data of UB-state in the presence of different concentrations of SDS indicate that the submicellar concentrations of SDS (≤0.4 mM) transform the UB-state to MGSDS-state. The MGSDS-state has native-like α-helical secondary structure but lacks tertiary structure. The free energy change (ΔG°D) for UB→ MGSDS transition determined by far-UV CD (∼2.7 kcal mol-1) is slightly higher than those determined by fluorescence (∼2.0 kcal mol-1) at 25°C. At very low SDS and NaCl concentrations, the MGSDS-state undergoes cold denaturation. As SDS concentration is increased, the thermal denaturation temperature increases and the cold denaturation temperature decrease. Kinetic experiments involving the measurement of the CO-association rate to the base-denatured ferrocytochrome c at pH ≈12.8 (±0.2), 25°C indicate that the submicellar concentrations of SDS restrict the internal dynamics of base-denatured protein.
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Affiliation(s)
- Rishu Jain
- School of Chemistry and Biochemistry, Thapar University, Patiala, India.,Department of Chemistry, Gujranwala Guru Nanak Khalsa College, Ghumar Mandi, Civil Lines, Ludhiana, India
| | - Deepak Sharma
- Council of Scientific and Industrial Research-Institute of Microbial Technology, Sector 39A, Chandigarh, India
| | - Rakesh Kumar
- Council of Scientific and Industrial Research-Institute of Microbial Technology, Sector 39A, Chandigarh, India
| | - Rajesh Kumar
- School of Chemistry and Biochemistry, Thapar University, Patiala, India.,School of Basic and Applied Sciences, Department of Chemical Sciences, Central University of Punjab, Bathinda, India
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7
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Huda N, Hossain M, Bhuyan AK. Complete observation of all structural, conformational, and fibrillation transitions of monomeric globular proteins at submicellar sodium dodecyl sulfate concentrations. Biopolymers 2019; 110:e23255. [PMID: 30633322 DOI: 10.1002/bip.23255] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2018] [Revised: 12/18/2018] [Accepted: 12/21/2018] [Indexed: 11/06/2022]
Abstract
Although considerable information is available regarding protein-sodium dodecyl sulfate (SDS) interactions, it is still unclear as to how much SDS is needed to denature proteins. The role of protein charge and micellar surfactant concentration on amyloid fibrillation is also unclear. This study reports on equilibrium measurements of SDS interaction with six model proteins and analyzes the results to obtain a general understanding of conformational breakdown, reorganization and restructuring of secondary structure, and entry into the amyloid fibrillar state. Significantly, all of these responses are entirely resolved at much lower than the critical micellar concentration (CMC) of SDS. Electrostatic interaction of the dodecyl sulfate anion (DS- ) with positive surface potential on the protein can completely unfold both secondary and tertiary structures, which is followed by protein chain restructuration to α-helices. All SDS-denatured proteins contain more α-helices than the corresponding native state. SDS interaction stochastically drives proteins to the aggregated fibrillar state.
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Affiliation(s)
- Noorul Huda
- School of Chemistry, University of Hyderabad, Hyderabad, India
| | - Mujahid Hossain
- School of Chemistry, University of Hyderabad, Hyderabad, India
| | - Abani K Bhuyan
- School of Chemistry, University of Hyderabad, Hyderabad, India
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8
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Mondal S, Das B. A study on the interaction of horse heart cytochrome c with some conventional and ionic liquid surfactants probed by ultraviolet-visible and fluorescence spectroscopic techniques. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2018; 198:278-282. [PMID: 29554518 DOI: 10.1016/j.saa.2018.03.026] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2017] [Revised: 02/19/2018] [Accepted: 03/11/2018] [Indexed: 06/08/2023]
Abstract
The interactions of a protein cytochrome c with some selected conventional and ionic liquid surfactants have been investigated at pH7.4 using ultraviolet-visible and fluorescence spectroscopic techniques. We used four conventional surfactants - cetyltrimethylammonium bromide (CTAB), dodecyltrimethylammonium bromide (DTAB), sodium N-dodecanoylsarcosinate (SDDS), and N-decanoyl-N-methylglucamine (Mega 10), and a surface active ionic liquid 1-hexadecyl-3-methylimidazolium chloride (C16MeImCl). All the investigated surfactants were found to induce an unfolding of the protein cytochrome c. In presence of CTAB, SDDS and C16MeImCl, the heme iron atom was found to loose methionine from its axial position. Differential binding of the surfactant monomers and their micelles to the protein molecules was inferred. The ionic surfactants were found to be more effective than the nonionic one in unfolding the investigated protein. However, the extent of binding of CTAB/C16MeImCl to cytochrome c reaches a plateau past the critical micellization concentration (cmc) of the surfactant. For each of the cytochrome c-DTAB, cytochrome c-SDDS and cytochrome c-Mega 10 system, although there exists an inflection in the surfactant-binding, saturation point could not be detected. It has been demonstrated from the ultraviolet-visible spectral studies that the oxidation state of iron in cytochrome c does not change when the protein binds with the investigated surfactants.
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Affiliation(s)
- Satyajit Mondal
- Department of Chemistry, Presidency University, Kolkata 700 073, India
| | - Bijan Das
- Department of Chemistry, Presidency University, Kolkata 700 073, India.
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9
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Nakamura S, Saotome T, Nakazawa A, Fukuda M, Kuroda Y, Kidokoro SI. Thermodynamics of the Thermal Denaturation of Acid Molten Globule State of Cytochrome c Indicate a Reversible High-Temperature Oligomerization Process. Biochemistry 2017; 56:2372-2378. [DOI: 10.1021/acs.biochem.6b01225] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Shigeyoshi Nakamura
- Department
of General Education, National Institute of Technology, Ube College, 2-14-1 Tokiwadai, Ube 755-8555, Japan
- Department
of Bioengineering, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka 940-2188, Japan
| | - Tomonori Saotome
- Department
of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, 2-24-15 Nakamachi, Koganei 184-8588, Japan
| | - Akiko Nakazawa
- Department
of Bioengineering, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka 940-2188, Japan
| | - Masao Fukuda
- Department
of Bioengineering, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka 940-2188, Japan
| | - Yutaka Kuroda
- Department
of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, 2-24-15 Nakamachi, Koganei 184-8588, Japan
| | - Shun-ichi Kidokoro
- Department
of Bioengineering, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka 940-2188, Japan
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10
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Paul SS, Sil P, Chakraborty R, Haldar S, Chattopadhyay K. Molecular Crowding Affects the Conformational Fluctuations, Peroxidase Activity, and Folding Landscape of Yeast Cytochrome c. Biochemistry 2016; 55:2332-43. [DOI: 10.1021/acs.biochem.6b00053] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Simanta Sarani Paul
- Protein
Folding and Dynamics Laboratory, Structural Biology and Bioinformatics
Division, CSIR-Indian Institute of Chemical Biology, 4, Raja S. C.
Mullick Road, Kolkata 700032, India
| | - Pallabi Sil
- Protein
Folding and Dynamics Laboratory, Structural Biology and Bioinformatics
Division, CSIR-Indian Institute of Chemical Biology, 4, Raja S. C.
Mullick Road, Kolkata 700032, India
| | - Ritobrita Chakraborty
- Protein
Folding and Dynamics Laboratory, Structural Biology and Bioinformatics
Division, CSIR-Indian Institute of Chemical Biology, 4, Raja S. C.
Mullick Road, Kolkata 700032, India
| | - Shubhasis Haldar
- Department
of Cellular Biochemistry, Max Planck Institute of Biochemistry, Am Klopferspitz
18, 82152 Martinsried, Germany
| | - Krishnananda Chattopadhyay
- Protein
Folding and Dynamics Laboratory, Structural Biology and Bioinformatics
Division, CSIR-Indian Institute of Chemical Biology, 4, Raja S. C.
Mullick Road, Kolkata 700032, India
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11
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Capdevila DA, Oviedo Rouco S, Tomasina F, Tortora V, Demicheli V, Radi R, Murgida DH. Active Site Structure and Peroxidase Activity of Oxidatively Modified Cytochrome c Species in Complexes with Cardiolipin. Biochemistry 2015; 54:7491-504. [PMID: 26620444 DOI: 10.1021/acs.biochem.5b00922] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We report a resonance Raman and UV-vis characterization of the active site structure of oxidatively modified forms of cytochrome c (Cyt-c) free in solution and in complexes with cardiolipin (CL). The studied post-translational modifications of Cyt-c include methionine sulfoxidation and tyrosine nitration, which lead to altered heme axial ligation and increased peroxidase activity with respect to those of the wild-type protein. In spite of the structural and activity differences between the protein variants free in solution, binding to CL liposomes induces in all cases the formation of a spectroscopically identical bis-His axial coordination conformer that more efficiently promotes lipid peroxidation. The spectroscopic results indicate that the bis-His form is in equilibrium with small amounts of high-spin species, thus suggesting a labile distal His ligand as the basis for the CL-induced increase in enzymatic activity observed for all protein variants. For Cyt-c nitrated at Tyr74 and sulfoxidized at Met80, the measured apparent binding affinities for CL are ∼4 times larger than for wild-type Cyt-c. On the basis of these results, we propose that these post-translational modifications may amplify the pro-apoptotic signal of Cyt-c under oxidative stress conditions at CL concentrations lower than for the unmodified protein.
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Affiliation(s)
- Daiana A Capdevila
- Departamento de Química Inorgánica, Analítica y Química Física and INQUIMAE (CONICET-UBA), Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria , Pab. 2, piso 1, C1428EHA Buenos Aires, Argentina
| | - Santiago Oviedo Rouco
- Departamento de Química Inorgánica, Analítica y Química Física and INQUIMAE (CONICET-UBA), Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria , Pab. 2, piso 1, C1428EHA Buenos Aires, Argentina
| | - Florencia Tomasina
- Departamento de Bioquímica and Center for Free Radical and Biomedical Research, Facultad de Medicina, Universidad de la República , Montevideo, Uruguay
| | - Verónica Tortora
- Departamento de Bioquímica and Center for Free Radical and Biomedical Research, Facultad de Medicina, Universidad de la República , Montevideo, Uruguay
| | - Verónica Demicheli
- Departamento de Bioquímica and Center for Free Radical and Biomedical Research, Facultad de Medicina, Universidad de la República , Montevideo, Uruguay
| | - Rafael Radi
- Departamento de Bioquímica and Center for Free Radical and Biomedical Research, Facultad de Medicina, Universidad de la República , Montevideo, Uruguay
| | - Daniel H Murgida
- Departamento de Química Inorgánica, Analítica y Química Física and INQUIMAE (CONICET-UBA), Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria , Pab. 2, piso 1, C1428EHA Buenos Aires, Argentina
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12
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Haldar S, Sil P, Thangamuniyandi M, Chattopadhyay K. Conversion of amyloid fibrils of cytochrome c to mature nanorods through a honeycomb morphology. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:4213-23. [PMID: 25338286 DOI: 10.1021/la5029993] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Amyloid species with various morphologies have been found for different proteins and disease systems. In this article, we aim to ask if these morphologies are unique to a particular protein or if they convert from one to another. Using a heme protein containing iron as the transition-metal activator of aggregation and a negatively charged surfactant, partial unfolding of the protein and its aggregation have been induced. In the pathway of aggregation, we have observed the formation of several morphological structures of a single protein, which were visualized directly using atomic force microscopy (AFM). These structures have been found to appear and disappear with time, and their formation could be monitored under normal buffer conditions and at room temperature without requiring any sophisticated chemical or biological methodologies. In addition, we have observed the formation of honeycomb-shaped morphology, which may serve as an intermediate. These amyloid-based nanostructures may have the potential to be explored in therapeutics delivery and other biomedical applications.
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Affiliation(s)
- Shubhasis Haldar
- Protein Folding and Dynamics Laboratory, Structural Biology and Bioinformatics Division, CSIR-Indian Institute of Chemical Biology, 4 Raja S. C. Mullick Road, Kolkata 700032, India
| | - Pallabi Sil
- Protein Folding and Dynamics Laboratory, Structural Biology and Bioinformatics Division, CSIR-Indian Institute of Chemical Biology, 4 Raja S. C. Mullick Road, Kolkata 700032, India
| | - Muruganandan Thangamuniyandi
- Protein Folding and Dynamics Laboratory, Structural Biology and Bioinformatics Division, CSIR-Indian Institute of Chemical Biology, 4 Raja S. C. Mullick Road, Kolkata 700032, India
| | - Krishnananda Chattopadhyay
- Protein Folding and Dynamics Laboratory, Structural Biology and Bioinformatics Division, CSIR-Indian Institute of Chemical Biology, 4 Raja S. C. Mullick Road, Kolkata 700032, India
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13
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Application of Divergence Entropy to Characterize the Structure of the Hydrophobic Core in DNA Interacting Proteins. ENTROPY 2015. [DOI: 10.3390/e17031477] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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14
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Bharmoria P, Trivedi TJ, Pabbathi A, Samanta A, Kumar A. Ionic liquid-induced all-α to α + β conformational transition in cytochrome c with improved peroxidase activity in aqueous medium. Phys Chem Chem Phys 2015; 17:10189-99. [DOI: 10.1039/c4cp06044j] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Choline dioctylsulfosuccinate [Cho][AOT] (a surface active ionic liquid) has been found to induce all-α to α + β conformational transition in the secondary structure of enzyme cytochrome c (Cyt c) with an enhanced peroxidase activity in its aqueous vesicular phase at pH 7.0.
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Affiliation(s)
- Pankaj Bharmoria
- Academy of Scientific and Innovative research (AcSIR)
- Central Salt and Marine Chemicals Research Institute
- Council of Scientific and Industrial Research (CSIR)
- Bhavnagar-364002
- India
| | - Tushar J. Trivedi
- Graduate School of EEWS (Energy Environment Water Sustainability)
- KAIST
- Daejeon 305-701
- Republic of Korea
| | - Ashok Pabbathi
- School of Chemistry
- University of Hyderabad
- Hyderabad 500 046
- India
| | - Anunay Samanta
- School of Chemistry
- University of Hyderabad
- Hyderabad 500 046
- India
| | - Arvind Kumar
- Academy of Scientific and Innovative research (AcSIR)
- Central Salt and Marine Chemicals Research Institute
- Council of Scientific and Industrial Research (CSIR)
- Bhavnagar-364002
- India
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15
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Yanamala N, Kapralov AA, Djukic M, Peterson J, Mao G, Klein-Seetharaman J, Stoyanovsky DA, Stursa J, Neuzil J, Kagan VE. Structural re-arrangement and peroxidase activation of cytochrome c by anionic analogues of vitamin E, tocopherol succinate and tocopherol phosphate. J Biol Chem 2014; 289:32488-98. [PMID: 25278024 DOI: 10.1074/jbc.m114.601377] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Cytochrome c is a multifunctional hemoprotein in the mitochondrial intermembrane space whereby its participation in electron shuttling between respiratory complexes III and IV is alternative to its role in apoptosis as a peroxidase activated by interaction with cardiolipin (CL), and resulting in selective CL peroxidation. The switch from electron transfer to peroxidase function requires partial unfolding of the protein upon binding of CL, whose specific features combine negative charges of the two phosphate groups with four hydrophobic fatty acid residues. Assuming that other endogenous small molecule ligands with a hydrophobic chain and a negatively charged functionality may activate cytochrome c into a peroxidase, we investigated two hydrophobic anionic analogues of vitamin E, α-tocopherol succinate (α-TOS) and α-tocopherol phosphate (α-TOP), as potential inducers of peroxidase activity of cytochrome c. NMR studies and computational modeling indicate that they interact with cytochrome c at similar sites previously proposed for CL. Absorption spectroscopy showed that both analogues effectively disrupt the Fe-S(Met(80)) bond associated with unfolding of cytochrome c. We found that α-TOS and α-TOP stimulate peroxidase activity of cytochrome c. Enhanced peroxidase activity was also observed in isolated rat liver mitochondria incubated with α-TOS and tBOOH. A mitochondria-targeted derivative of TOS, triphenylphosphonium-TOS (mito-VES), was more efficient in inducing H2O2-dependent apoptosis in mouse embryonic cytochrome c(+/+) cells than in cytochrome c(-/-) cells. Essential for execution of the apoptotic program peroxidase activation of cytochrome c by α-TOS may contribute to its known anti-cancer pharmacological activity.
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Affiliation(s)
- Naveena Yanamala
- From the Center for Free Radical and Antioxidant Health, the Departments of Environmental and Occupational Health
| | - Alexander A Kapralov
- From the Center for Free Radical and Antioxidant Health, the Departments of Environmental and Occupational Health
| | - Mirjana Djukic
- From the Center for Free Radical and Antioxidant Health, the Departments of Environmental and Occupational Health
| | - Jim Peterson
- the Departments of Environmental and Occupational Health
| | - Gaowei Mao
- From the Center for Free Radical and Antioxidant Health, the Departments of Environmental and Occupational Health
| | - Judith Klein-Seetharaman
- the Division of Metabolic and Vascular Health, Medical School, University of Warwick, Coventry CV4 7AL, United Kingdom
| | - Detcho A Stoyanovsky
- From the Center for Free Radical and Antioxidant Health, the Departments of Environmental and Occupational Health
| | - Jan Stursa
- the Biomedical Research Center, University Hospital, Hradec Kralove 569810, Czech Republic
| | - Jiri Neuzil
- the Institute of Biotechnology, Academy of Sciences of the Czech Republic, Prague 14220, Czech Republic, and the School of Medical Science, Griffith University, Southport, Queensland 4222, Australia
| | - Valerian E Kagan
- From the Center for Free Radical and Antioxidant Health, the Departments of Environmental and Occupational Health, Pharmacology and Chemical Biology, Radiation Oncology, and Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260
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16
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Zhang N, Liu FF, Dong XY, Sun Y. Synergistic inhibition of acid-induced protein denaturation by trehalose and NaCl: Thermodynamic and kinetic studies. Biochem Eng J 2014. [DOI: 10.1016/j.bej.2014.08.019] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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17
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Alves FR, Carvalho FAO, Carvalho JWP, Tabak M. Glossoscolex paulistus extracellular hemoglobin (HbGp) oligomeric dissociation upon interaction with sodium dodecyl sulfate: Isothermal titration calorimetry (ITC). Biopolymers 2014; 101:1065-76. [DOI: 10.1002/bip.22506] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2014] [Revised: 05/06/2014] [Accepted: 05/13/2014] [Indexed: 11/07/2022]
Affiliation(s)
- Fernanda Rosa Alves
- Instituto de Química de São Carlos; Departamento de Química e Física Molecular, Universidade de São Paulo, São Carlos, SP; Brazil
| | - Francisco Adriano O. Carvalho
- Instituto de Química de São Carlos; Departamento de Química e Física Molecular, Universidade de São Paulo, São Carlos, SP; Brazil
| | - José Wilson P. Carvalho
- Instituto de Química de São Carlos; Departamento de Química e Física Molecular, Universidade de São Paulo, São Carlos, SP; Brazil
- Universidade do Estado de Mato Grosso; Campus Rene Barbour; Barra do Bugres MT Brazil
| | - Marcel Tabak
- Instituto de Química de São Carlos; Departamento de Química e Física Molecular, Universidade de São Paulo, São Carlos, SP; Brazil
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18
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Deshpande MS, Parui PP, Kamikubo H, Yamanaka M, Nagao S, Komori H, Kataoka M, Higuchi Y, Hirota S. Formation of Domain-Swapped Oligomer of Cytochrome c from Its Molten Globule State Oligomer. Biochemistry 2014; 53:4696-703. [DOI: 10.1021/bi500497s] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Megha Subhash Deshpande
- Graduate
School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0192, Japan
| | - Partha Pratim Parui
- Graduate
School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0192, Japan
- Department
of Chemistry, Jadavpur University, Kolkata 700032, India
| | - Hironari Kamikubo
- Graduate
School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0192, Japan
| | - Masaru Yamanaka
- Graduate
School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0192, Japan
| | - Satoshi Nagao
- Graduate
School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0192, Japan
| | - Hirofumi Komori
- Faculty
of Education, Kagawa University, 1-1 Saiwai, Takamatsu, Kagawa 760-8522, Japan
| | - Mikio Kataoka
- Graduate
School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0192, Japan
| | - Yoshiki Higuchi
- Department
of Life Science, Graduate School of Life Science, University of Hyogo, 3-2-1 Koto, Kamigori-cho, Ako-gun, Hyogo 678-1297, Japan
- RIKEN SPring-8 Center, 1-1-1
Koto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
| | - Shun Hirota
- Graduate
School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0192, Japan
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19
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Jiang J, Bakan A, Kapralov AA, Ishara Silva K, Huang Z, Amoscato AA, Peterson J, Krishna Garapati V, Saxena S, Bayir H, Atkinson J, Bahar I, Kagan VE. Designing inhibitors of cytochrome c/cardiolipin peroxidase complexes: mitochondria-targeted imidazole-substituted fatty acids. Free Radic Biol Med 2014; 71:221-230. [PMID: 24631490 PMCID: PMC4216591 DOI: 10.1016/j.freeradbiomed.2014.02.029] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/20/2013] [Revised: 02/27/2014] [Accepted: 02/28/2014] [Indexed: 01/17/2023]
Abstract
Mitochondria have emerged as the major regulatory platform responsible for the coordination of numerous metabolic reactions as well as cell death processes, whereby the execution of intrinsic apoptosis includes the production of reactive oxygen species fueling oxidation of cardiolipin (CL) catalyzed by cytochrome (Cyt) c. As this oxidation occurs within the peroxidase complex of Cyt c with CL, the latter represents a promising target for the discovery and design of drugs with antiapoptotic mechanisms of action. In this work, we designed and synthesized a new group of mitochondria-targeted imidazole-substituted analogs of stearic acid TPP-n-ISAs with various positions of the attached imidazole group on the fatty acid (n = 6, 8, 10, 13, and 14). By using a combination of absorption spectroscopy and EPR protocols (continuous wave electron paramagnetic resonance and electron spin echo envelope modulation) we demonstrated that TPP-n-ISAs indeed were able to potently suppress CL-induced structural rearrangements in Cyt c, paving the way to its peroxidase competence. TPP-n-ISA analogs preserved the low-spin hexa-coordinated heme-iron state in Cyt c/CL complexes whereby TPP-6-ISA displayed a significantly more effective preservation pattern than TPP-14-ISA. Elucidation of these intermolecular stabilization mechanisms of Cyt c identified TPP-6-ISA as an effective inhibitor of the peroxidase function of Cyt c/CL complexes with a significant antiapoptotic potential realized in mouse embryonic cells exposed to ionizing irradiation. These experimental findings were detailed and supported by all-atom molecular dynamics simulations. Based on the experimental data and computation predictions, we identified TPP-6-ISA as a candidate drug with optimized antiapoptotic potency.
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Affiliation(s)
- Jianfei Jiang
- Center for Free Radical and Antioxidant Health and Center for Medical Countermeasures against Radiation, University of Pittsburgh, Pittsburgh, PA 15219, USA; Department of Environmental and Occupational Health, University of Pittsburgh, Pittsburgh, PA 15219, USA
| | - Ahmet Bakan
- Department of Computational and System Biology, University of Pittsburgh, Pittsburgh, PA 15219, USA
| | - Alexandr A Kapralov
- Center for Free Radical and Antioxidant Health and Center for Medical Countermeasures against Radiation, University of Pittsburgh, Pittsburgh, PA 15219, USA; Department of Environmental and Occupational Health, University of Pittsburgh, Pittsburgh, PA 15219, USA
| | - K Ishara Silva
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA 15219, USA
| | - Zhentai Huang
- Center for Free Radical and Antioxidant Health and Center for Medical Countermeasures against Radiation, University of Pittsburgh, Pittsburgh, PA 15219, USA; Department of Environmental and Occupational Health, University of Pittsburgh, Pittsburgh, PA 15219, USA
| | - Andrew A Amoscato
- Center for Free Radical and Antioxidant Health and Center for Medical Countermeasures against Radiation, University of Pittsburgh, Pittsburgh, PA 15219, USA; Department of Environmental and Occupational Health, University of Pittsburgh, Pittsburgh, PA 15219, USA
| | - James Peterson
- Department of Environmental and Occupational Health, University of Pittsburgh, Pittsburgh, PA 15219, USA
| | - Venkata Krishna Garapati
- Department of Chemistry & Centre for Biotechnology, Brock University, St. Catharines, ON L2S 3A1, Canada
| | - Sunil Saxena
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA 15219, USA
| | - Hülya Bayir
- Center for Free Radical and Antioxidant Health and Center for Medical Countermeasures against Radiation, University of Pittsburgh, Pittsburgh, PA 15219, USA; Department of Environmental and Occupational Health, University of Pittsburgh, Pittsburgh, PA 15219, USA; Department of Critical Care Medicine, University of Pittsburgh, Pittsburgh, PA 15219, USA
| | - Jeffrey Atkinson
- Department of Chemistry & Centre for Biotechnology, Brock University, St. Catharines, ON L2S 3A1, Canada
| | - Ivet Bahar
- Department of Computational and System Biology, University of Pittsburgh, Pittsburgh, PA 15219, USA
| | - Valerian E Kagan
- Center for Free Radical and Antioxidant Health and Center for Medical Countermeasures against Radiation, University of Pittsburgh, Pittsburgh, PA 15219, USA; Department of Environmental and Occupational Health, University of Pittsburgh, Pittsburgh, PA 15219, USA; Department of Chemistry, University of Pittsburgh, Pittsburgh, PA 15219, USA; Department of Pharmacology and Chemical Biology, and University of Pittsburgh, Pittsburgh, PA 15219, USA; Department of Radiation Oncology, University of Pittsburgh, Pittsburgh, PA 15219, USA.
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20
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Sashi P, Yasin UM, Balasubramanian H, Sree MU, Ramakrishna D, Bhuyan AK. Preferential water exclusion in protein unfolding. J Phys Chem B 2014; 118:717-23. [PMID: 24354363 DOI: 10.1021/jp4111103] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Association of water with protein plays a central role in the latter's folding, structure acquisition, ligand binding, catalytic reactivity, oligomerization, and crystallization. Because these phenomena are also influenced by the net charge content on the protein, the present study examines the association of water with cytochrome c held at different pH values so as to allow its side chains to ionize to variable extents. Equilibrium unfolding of differently charged cytochrome c molecules in water-methanol binary mixtures, where the alcohol acts as the cosolvent denaturant, was used to quantify the preferential exclusion of water during the unfolding transition. The extent of exclusion was found to be related to the net-charge-dependent molecular expansion of the protein in an alcohol-free aqueous medium. The degree of water exclusion was also found to be linearly related to the observed rate of protein unfolding, where the net charge contents of the initial and final states are the same. The results suggest that side-chain ionization, molecular expansion due to charge repulsion, and hence the loss of tertiary contacts lead to additional water-protein association. Protein unfolding rates appear to be linearly correlated with the effective number of water molecules excluded across the end states of unfolding equilibria.
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Affiliation(s)
- Pulikallu Sashi
- School of Chemistry University of Hyderabad , Hyderabad 500 046, India
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21
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Khan JM, Chaturvedi SK, Khan RH. Elucidating the mode of action of urea on mammalian serum albumins and protective effect of sodium dodecyl sulfate. Biochem Biophys Res Commun 2013; 441:681-8. [DOI: 10.1016/j.bbrc.2013.10.055] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2013] [Accepted: 10/11/2013] [Indexed: 11/30/2022]
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22
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Azadi G, Chauhan A, Tripathi A. Dilution of protein-surfactant complexes: a fluorescence study. Protein Sci 2013; 22:1258-65. [PMID: 23868358 DOI: 10.1002/pro.2313] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2013] [Revised: 06/25/2013] [Accepted: 07/08/2013] [Indexed: 11/11/2022]
Abstract
Dilution of protein-surfactant complexes is an integrated step in microfluidic protein sizing, where the contribution of free micelles to the overall fluorescence is reduced by dilution. This process can be further improved by establishing an optimum surfactant concentration and quantifying the amount of protein based on the fluorescence intensity. To this end, we study the interaction of proteins with anionic sodium dodecyl sulfate (SDS) and cationic hexadecyl trimethyl ammonium bromide (CTAB) using a hydrophobic fluorescent dye (sypro orange). We analyze these interactions fluourometrically with bovine serum albumin, carbonic anhydrase, and beta-galactosidase as model proteins. The fluorescent signature of protein-surfactant complexes at various dilution points shows three distinct regions, surfactant dominant, breakdown, and protein dominant region. Based on the dilution behavior of protein-surfactant complexes, we propose a fluorescence model to explain the contribution of free and bound micelles to the overall fluorescence. Our results show that protein peak is observed at 3 mM SDS as the optimum dilution concentration. Furthermore, we study the effect of protein concentration on fluorescence intensity. In a single protein model with a constant dye quantum yield, the peak height increases with protein concentration. Finally, addition of CTAB to the protein-SDS complex at mole fractions above 0.1 shifts the protein peak from 3 mM to 4 mM SDS. The knowledge of protein-surfactant interactions obtained from these studies provides significant insights for novel detection and quantification techniques in microfluidics.
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Affiliation(s)
- Glareh Azadi
- Center for Biomedical Engineering, School of Engineering, Brown University, Providence, Rhode Island, 02912
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23
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Behera RK, Nakajima H, Rajbongshi J, Watanabe Y, Mazumdar S. Thermodynamic Effects of the Alteration of the Axial Ligand on the Unfolding of Thermostable Cytochrome c. Biochemistry 2013; 52:1373-84. [DOI: 10.1021/bi300982v] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Rabindra Kumar Behera
- Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha
Road, Colaba, Mumbai 400005, India
| | - Hiroshi Nakajima
- Department of Chemistry, Graduate
School of Science, Nagoya University, Nagoya
464-8602, Japan
| | - Jitumani Rajbongshi
- Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha
Road, Colaba, Mumbai 400005, India
- Department
of Chemistry, Gauhati University, Guwahati
781014, India
| | - Yoshihito Watanabe
- Department of Chemistry, Graduate
School of Science, Nagoya University, Nagoya
464-8602, Japan
| | - Shyamalava Mazumdar
- Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha
Road, Colaba, Mumbai 400005, India
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24
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Equilibrium and kinetic studies of the counteraction of trehalose on acid-induced protein unfolding. Biochem Eng J 2013. [DOI: 10.1016/j.bej.2012.11.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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25
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Sen Mojumdar S, Chowdhury R, Chattoraj S, Bhattacharyya K. Role of Ionic Liquid on the Conformational Dynamics in the Native, Molten Globule, and Unfolded States of Cytochrome C: A Fluorescence Correlation Spectroscopy Study. J Phys Chem B 2012; 116:12189-98. [DOI: 10.1021/jp307297s] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Supratik Sen Mojumdar
- Department of Physical
Chemistry, Indian Association for the Cultivation of Science, Jadavpur,
Kolkata-700032, India
| | - Rajdeep Chowdhury
- Department of Physical
Chemistry, Indian Association for the Cultivation of Science, Jadavpur,
Kolkata-700032, India
| | - Shyamtanu Chattoraj
- Department of Physical
Chemistry, Indian Association for the Cultivation of Science, Jadavpur,
Kolkata-700032, India
| | - Kankan Bhattacharyya
- Department of Physical
Chemistry, Indian Association for the Cultivation of Science, Jadavpur,
Kolkata-700032, India
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26
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Hirota S, Ueda M, Hayashi Y, Nagao S, Kamikubo H, Kataoka M. Maintenance of the secondary structure of horse cytochrome c during the conversion process of monomers to oligomers by addition of ethanol. ACTA ACUST UNITED AC 2012; 152:521-9. [DOI: 10.1093/jb/mvs098] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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27
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Nakamura S, Kidokoro SI. Volumetric Properties of the Molten Globule State of Cytochrome c in the Thermal Three-State Transition Evaluated by Pressure Perturbation Calorimetry. J Phys Chem B 2012; 116:1927-32. [DOI: 10.1021/jp209686e] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Shigeyoshi Nakamura
- Department of Bioengineering, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka 940-2188, Japan
| | - Shun-ichi Kidokoro
- Department of Bioengineering, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka 940-2188, Japan
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28
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Haldar S, Chattopadhyay K. Effects of arginine and other solution additives on the self-association of different surfactants: an investigation at single-molecule resolution. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:5842-5849. [PMID: 21488688 DOI: 10.1021/la200580z] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Fluorescence correlation spectroscopy is used to monitor the self-association of SDS and DTAB monomers at single-molecule resolution. Tetramethylrhodamine-5-maleimide (TMR) has been chosen as a probe because rhodamine dyes have been shown to bind surfactant micelles. Correlation functions obtained by FCS experiments have been fit using conventional discrete diffusional component analysis as well as the more recent maximum entropy method (MEM). Hydrodynamic radii calculated from the diffusion time values increase with surfactant concentration as the monomers self-associate. Effects of several solution additives on the self-association property of the surfactants have been studied. Urea and glycerol inhibit self-association, and arginine shows a dual nature. With SDS, arginine favors self-association, and with DTAB, it inhibits micelle formation. We propose surfactant self-association to be a "supersimplified" model of protein aggregation.
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Affiliation(s)
- Shubhasis Haldar
- Structural Biology and Bioinformatics Division, Indian Institute of Chemical Biology, Council of Scientific and Industrial Research, 4 Raja S. C. Mullick Road, Kolkata 700032, India
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29
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Otzen D. Protein–surfactant interactions: A tale of many states. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2011; 1814:562-91. [DOI: 10.1016/j.bbapap.2011.03.003] [Citation(s) in RCA: 362] [Impact Index Per Article: 27.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2010] [Revised: 02/23/2011] [Accepted: 03/04/2011] [Indexed: 10/18/2022]
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30
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Nakamura S, Seki Y, Katoh E, Kidokoro SI. Thermodynamic and structural properties of the acid molten globule state of horse cytochrome C. Biochemistry 2011; 50:3116-26. [PMID: 21388230 DOI: 10.1021/bi101806b] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
To understand the stabilization, folding, and functional mechanisms of proteins, it is very important to understand the structural and thermodynamic properties of the molten globule state. In this study, the global structure of the acid molten globule state, which we call MG1, of horse cytochrome c at low pH and high salt concentrations was evaluated by solution X-ray scattering (SXS), dynamic light scattering, and circular dichroism measurements. MG1 was globular and slightly (3%) larger than the native state, N. Calorimetric methods, such as differential scanning calorimetry and isothermal acid-titration calorimetry, were used to evaluate the thermodynamic parameters in the transitions of N to MG1 and MG1 to denatured state D of horse cytochrome c. The heat capacity change, ΔC(p), in the N-to-MG1 transition was determined to be 2.56 kJ K(-1) mol(-1), indicating the increase in the level of hydration in the MG1 state. Moreover, the intermediate state on the thermal N-to-D transition of horse cytochrome c at pH 4 under low-salt conditions showed the same structural and thermodynamic properties of the MG1 state in both SXS and calorimetric measurements. The Gibbs free energy changes (ΔG) for the N-to-MG1 and N-to-D transitions at 15 °C were 10.9 and 42.2 kJ mol(-1), respectively.
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Affiliation(s)
- Shigeyoshi Nakamura
- Department of Bioengineering, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka, Niigata 940-2188, Japan
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31
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Khan MKA, Rahaman H, Ahmad F. Conformation and thermodynamic stability of pre-molten and molten globule states of mammalian cytochromes-c. Metallomics 2011; 3:327-38. [DOI: 10.1039/c0mt00078g] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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32
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The non-native conformations of cytochrome c in sodium dodecyl sulfate and their modulation by ATP. EUROPEAN BIOPHYSICS JOURNAL: EBJ 2010; 40:259-71. [PMID: 21116622 DOI: 10.1007/s00249-010-0643-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2010] [Revised: 10/16/2010] [Accepted: 11/10/2010] [Indexed: 10/18/2022]
Abstract
To understand the interaction of cytochrome c (cyt c) with membranes, a systematic investigation of sodium dodecyl sulfate (SDS)-induced conformational alterations in native horse heart ferricytochrome c (pH 7.0) was carried out using heme absorbance, tryptophan fluorescence and circular dichroism (CD) spectroscopy. ATP interaction with membrane-bound cyt c is known to regulate the process of apoptosis. To understand the effect of nucleotide phosphates on membrane-bound cyt c, we also carried out studies of the interaction of ATP with cyt c in the presence of SDS. Fluorescence and UV-Vis data suggest that SDS induces two different transitions (F to C1, C1 to C2) in cyt c, one in the pre-micellar region and the other in the post-micellar region. The fluorescence data further indicated the increase in distance between Trp 59 and heme in the intermediates in both the regions, suggesting loosening up of cyt c on titration with SDS. The far-UV and near-UV CD data suggest partial loss of secondary and tertiary structure in C1, but complete loss of tertiary structure and no further loss of secondary structure in C2. On titration of C1 and C2 with ATP, the secondary structure is restored. However, the heme ligation pattern and heme exposure change only for C2, but not for C1 on the addition of ATP.
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33
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Haldar S, Mitra S, Chattopadhyay K. Role of protein stabilizers on the conformation of the unfolded state of cytochrome c and its early folding kinetics: investigation at single molecular resolution. J Biol Chem 2010; 285:25314-23. [PMID: 20538585 PMCID: PMC2919094 DOI: 10.1074/jbc.m110.116673] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2010] [Revised: 05/31/2010] [Indexed: 11/06/2022] Open
Abstract
An insight into the conformation and dynamics of unfolded and early intermediate states of a protein is essential to understand the mechanism of its aggregation and to design potent inhibitor molecules. Fluorescence correlation spectroscopy has been used to study the effects of several model protein stabilizers on the conformation of the unfolded state and early folding dynamics of tetramethyl rhodamine-labeled cytochrome c from Saccharomyces cerevisiae at single molecular resolution. Special attention has been given to arginine, which is a widely used stabilizer for improving refolding yield of different proteins. The value of the hydrodynamic radius (r(H)) obtained by analyzing the intensity fluctuations of the diffusing molecules has been found to increase in a two-state manner as the protein is unfolded by urea. The results further show that the presence of arginine and other protein stabilizers favors a relatively structured conformation of the unfolded states (r(H) of 29 A) over an extended one (r(H) of 40 A), which forms in their absence. Also, the time constant of a kinetic component (tau(R)) of about 30 micros has been observed by analyzing the correlation functions, which represents formation of a collapsed state. This time constant varies with urea concentration representing an inverted Chevron plot that shows a roll-over and behavior in the absence of arginine. To the best of our knowledge, this is one of the first applications of fluorescence correlation spectroscopy to study direct folding kinetics of a protein.
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Affiliation(s)
- Shubhasis Haldar
- From the Structural Biology and Bioinformatics Division, Indian Institute of Chemical Biology, Council of Scientific and Industrial Research, 4, Raja S. C. Mullick Road, Kolkata 700032, India
| | - Samaresh Mitra
- From the Structural Biology and Bioinformatics Division, Indian Institute of Chemical Biology, Council of Scientific and Industrial Research, 4, Raja S. C. Mullick Road, Kolkata 700032, India
| | - Krishnananda Chattopadhyay
- From the Structural Biology and Bioinformatics Division, Indian Institute of Chemical Biology, Council of Scientific and Industrial Research, 4, Raja S. C. Mullick Road, Kolkata 700032, India
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34
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Abstract
To understand the mechanism of ionic detergent-induced protein denaturation, this study examines the action of sodium dodecyl sulfate on ferrocytochrome c conformation under neutral and strongly alkaline conditions. Equilibrium and stopped-flow kinetic results consistently suggest that tertiary structure unfolding in the submicellar and chain expansion in the micellar range of SDS concentrations are the two major and discrete events in the perturbation of protein structure. The nature of interaction between the detergent and the protein is predominantly hydrophobic in the submicellar and exclusively hydrophobic at micellar levels of SDS concentration. The observation that SDS also interacts with a highly denatured and negatively charged form of ferrocytochrome c suggests that the interaction is independent of structure, conformation, and ionization state of the protein. The expansion of the protein chain at micellar concentration of SDS is driven by coulombic repulsion between the protein-bound micelles, and the micelles and anionic amino acid side chains.
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Affiliation(s)
- Abani K Bhuyan
- School of Chemistry, University of Hyderabad, Hyderabad 500046, India.
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35
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Farivar F, Moosavi-Movahedi AA, Sefidbakht Y, Nazari K, Hong J, Sheibani N. Cytochrome c in sodium dodecyl sulfate reverse micelle nanocage: From a classic electron carrier protein to an artificial peroxidase enzyme. Biochem Eng J 2010. [DOI: 10.1016/j.bej.2009.11.016] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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36
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Bracco LL, Einschlag FSG, Wolcan E, Ferraudi GJ. On the mechanism of the photoinduced reduction of an adduct of ferricytochrome C with a poly(4-vinylpyridine) polymer containing –ReI (CO)3(3,4,7,8-tetramethyl-1,10-phenanthroline) pendants. J Photochem Photobiol A Chem 2009. [DOI: 10.1016/j.jphotochem.2009.08.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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37
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Kagan VE, Bayir HA, Belikova NA, Kapralov O, Tyurina YY, Tyurin VA, Jiang J, Stoyanovsky DA, Wipf P, Kochanek PM, Greenberger JS, Pitt B, Shvedova AA, Borisenko G. Cytochrome c/cardiolipin relations in mitochondria: a kiss of death. Free Radic Biol Med 2009; 46:1439-53. [PMID: 19285551 PMCID: PMC2732771 DOI: 10.1016/j.freeradbiomed.2009.03.004] [Citation(s) in RCA: 329] [Impact Index Per Article: 21.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/09/2009] [Revised: 03/02/2009] [Accepted: 03/04/2009] [Indexed: 12/16/2022]
Abstract
Recently, phospholipid peroxidation products gained a reputation as key regulatory molecules and participants in oxidative signaling pathways. During apoptosis, a mitochondria-specific phospholipid, cardiolipin (CL), interacts with cytochrome c (cyt c) to form a peroxidase complex that catalyzes CL oxidation; this process plays a pivotal role in the mitochondrial stage of the execution of the cell death program. This review is focused on redox mechanisms and essential structural features of cyt c's conversion into a CL-specific peroxidase that represent an interesting and maybe still unique example of a functionally significant ligand change in hemoproteins. Furthermore, specific characteristics of CL in mitochondria--its asymmetric transmembrane distribution and mechanisms of collapse, the regulation of its synthesis, remodeling, and fatty acid composition--are given significant consideration. Finally, new concepts in drug discovery based on the design of mitochondria-targeted inhibitors of cyt c/CL peroxidase and CL peroxidation with antiapoptotic effects are presented.
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Affiliation(s)
- Valerian E Kagan
- Center for Free Radical and Antioxidant Health, Pittsburgh, PA 15219, USA.
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38
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Shang W, Nuffer JH, Muñiz-Papandrea VA, Colón W, Siegel RW, Dordick JS. Cytochrome C on silica nanoparticles: influence of nanoparticle size on protein structure, stability, and activity. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2009; 5:470-6. [PMID: 19189325 DOI: 10.1002/smll.200800995] [Citation(s) in RCA: 124] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
The structure, thermodynamic and kinetic stability, and activity of cytochrome c (cyt c) on silica nanoparticles (SNPs) of different sizes have been studied. Adsorption of cyt c onto larger SNPs results in both greater disruption of the cyt c global structure and more significant changes of the local heme microenvironment than upon adsorption onto smaller SNPs. The disruption of the heme microenvironment leads to a more solvent-accessible protein active site, as suggested by Soret circular dichroism spectroscopy and through an increase in peroxidase activity as a function of increased SNP size. Similarly, the stability of cyt c decreases more dramatically upon adsorption onto larger SNPs. These results are consistent with changes in protein-nanoparticle interactions that depend on the size or surface curvature of the supporting nanostructure. This study provides further fundamental insights into the effects of nanoscale surfaces on adsorbed protein structure and function.
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Affiliation(s)
- Wen Shang
- Department of Materials Science and Engineering, Rensselaer Nanotechnology Center, Rensselaer Polytechnic Institute, 110 8th Street, Troy, NY 12180, USA
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Zhang W, Dai X, Zhao Y, Lu X, Gao P. Comparison of the different types of surfactants for the effect on activity and structure of soybean peroxidase. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:2363-8. [PMID: 19161266 DOI: 10.1021/la803240x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
In the pH 2.6 and 5.2 systems, soybean peroxidase (SBP) (isoelectric point, pI 3.9) has positive and negative charge, respectively. In order to acquire detailed knowledge on the role played by electrostatics in the denaturation of proteins, a comparison of anionic surfactant sodium dodecyl sulfate (SDS), nonionic surfactant nonaethylene glycol monododecyl ether [C12H25O(CH2CH2O)9H] (AEO9), and cationic surfactant cetyltrimethylammonium bromide (CTAB) for the influences on the activity and structure of soybean peroxidase (SBP) was carried out by measuring the activity, far-UV circular dichrosm, fluorescence, and electronic absorption spectra of SBP in the pH 2.6 and 5.2 systems at 30 degrees C. In the pH 2.6 systems, the interaction of SDS with SBP results in an increase in the fluorescence intensity with a red shift of the emission maximum of the tryptophan fluorescence and a blue shift of the Soret band. In the meantime, the alpha-helix of SBP is unfolded and the activity of SBP is lost irreversibly. In pH 5.2 systems, the fluorescence spectra features of SBP are similar to those in pH 2.6 systems with increasing SDS concentration, but a red shift of Soret band as well as an alteration of the tertiary structure of SBP occurs, and the lost activity is recoverable. The electrostatic interactions between SBP and SDS play an important role in the denaturation of SBP. The effects of AEO9 and CTAB in pH 2.6 and 5.2 systems on the activity and spectral features of SBP are similar to that of SDS in pH 5.2 systems, but AEO9 is prone to unfold the beta-sheet of SBP in pH 2.6 systems. The electrostatic interactions of CTAB with SBP are not the primary elements for denaturation of SBP, which distinctly differ from those of SDS. These results can be useful with respect to wide applications of the surfactants in the separation and purification of proteins.
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Affiliation(s)
- Weican Zhang
- State Key Laboratory of Microbial Technology, Shandong University, Jinan, Shandong, China, 250100
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40
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Mondal SK, Sahu K, Bhattacharyya K. Study of Biological Assemblies by Ultrafast Fluorescence Spectroscopy. REVIEWS IN FLUORESCENCE 2009. [DOI: 10.1007/978-0-387-88722-7_8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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41
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Chen E, Van Vranken V, Kliger DS. The Folding Kinetics of the SDS-Induced Molten Globule Form of Reduced Cytochrome c. Biochemistry 2008; 47:5450-9. [DOI: 10.1021/bi702452u] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Eefei Chen
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, California 95064
| | - Vanessa Van Vranken
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, California 95064
| | - David S. Kliger
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, California 95064
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Electrochemical Investigation of Bovine Hemoglobin at an Acetylene Black Paste Electrode in the Presence of Sodium Dodecyl Sulfate. B KOREAN CHEM SOC 2007. [DOI: 10.5012/bkcs.2007.28.10.1720] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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44
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Shimojo K, Oshima T, Naganawa H, Goto M. Calixarene-Assisted Protein Refolding via Liquid−Liquid Extraction. Biomacromolecules 2007; 8:3061-6. [PMID: 17718500 DOI: 10.1021/bm070418q] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In this paper we report on protein refolding by means of a liquid-liquid transfer technique using a calixarene. We have found that a calix[6]areneacetic acid derivative forms a supramolecular complex with urea-denatured cytochrome c at the oil-water interface, which enables quantitative transfer of the protein from an 8 M urea aqueous solution into an organic phase through a proton-exchange mechanism. Denatured cytochrome c is completely separated from the denaturant and is isolated from other denatured cytochrome c molecules to suppress the generation of aggregates due to protein-protein interactions. The recovery of cytochrome c from the organic phase is successfully achieved under acidic conditions using an appropriate amount of 1-butanol. UV-vis, CD, and fluorescence spectroscopic characterizations demonstrate that cytochrome c transferred into a denaturant-free aqueous solution regains its native structure. The reduction kinetics of refolded cytochrome c using ascorbic acid indicates that the protein provides approximately 72% of native activity as an electron-transfer protein.
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Affiliation(s)
- Kojiro Shimojo
- Division of Environment and Radiation Sciences, Nuclear Science and Engineering Directorate, Japan Atomic Energy Agency, Tokai-mura, Ibaraki, Japan
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45
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Ghosh S, Mandal U, Adhikari A, Dey S, Bhattacharyya K. Study of organized and biological systems using an ultrafast laser. INT REV PHYS CHEM 2007. [DOI: 10.1080/01442350701416888] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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46
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Sahu K, Mondal SK, Ghosh S, Bhattacharyya K. Ultrafast Dynamics in Biological Systems and in Nano-Confined Environments. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2007. [DOI: 10.1246/bcsj.80.1033] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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47
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Santiago PS, Moreira LM, de Almeida EV, Tabak M. Giant extracellular Glossoscolex paulistus Hemoglobin (HbGp) upon interaction with cethyltrimethylammonium chloride (CTAC) and sodium dodecyl sulphate (SDS) surfactants: Dissociation of oligomeric structure and autoxidation. Biochim Biophys Acta Gen Subj 2007; 1770:506-17. [PMID: 17196340 DOI: 10.1016/j.bbagen.2006.11.005] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2006] [Revised: 11/14/2006] [Accepted: 11/16/2006] [Indexed: 11/19/2022]
Abstract
The effects of two ionic surfactants on the oligomeric structure of the giant extracellular hemoglobin of Glossoscolex paulistus (HbGp) in the oxy - form have been studied through the use of several spectroscopic techniques such as electronic optical absorption, fluorescence emission, light scattering, and circular dichroism. The use of anionic sodium dodecyl sulphate (SDS) and cationic cethyltrimethyl ammonium chloride (CTAC) has allowed to differentiate the effects of opposite headgroup charges on the oligomeric structure dissociation and hemoglobin autoxidation. At pH 7.0, both surfactants induce the protein dissociation and a significant oxidation. Spectral changes occur at very low CTAC concentrations suggesting a significant electrostatic contribution to the protein-surfactant interaction. At low protein concentration, 0.08 mg/ml, some light scattering within a narrow CTAC concentration range occurs due to protein-surfactant precipitation. Light scattering experiments showed the dissociation of the oligomeric structure by SDS and CTAC, and the effect of precipitation induced by CTAC. At higher protein concentrations, 3.0 mg/ml, a precipitation was observed due to the intense charge neutralization upon formation of ion pair in the protein-surfactant precipitate. The spectral changes are spread over a much wider SDS concentration range, implying a smaller electrostatic contribution to the protein-surfactant interactions. The observed effects are consistent with the acid isoelectric point (pI) of this class of hemoglobins, which favors the intense interaction of HbGp with the cationic surfactant due to the existence of excess acid anionic residues at the protein surface. Protein secondary structure changes are significant for CTAC at low concentrations while they occur at significantly higher concentrations for SDS. In summary, the cationic surfactant seems to interact more strongly with the protein producing more dramatic spectral changes as compared to the anionic one. This is opposite as observed for several other hemoproteins. The surfactants at low concentrations produce the oligomeric dissociation, which facilitates the iron oxidation, an important factor modulating further oligomeric protein dissociation.
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Affiliation(s)
- Patricia S Santiago
- Instituto de Quimica de São Carlos, Universidade de São Paulo, 13560-970 São Carlos, SP, Brazil
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48
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Nakamura S, Baba T, Kidokoro SI. A molten globule-like intermediate state detected in the thermal transition of cytochrome c under low salt concentration. Biophys Chem 2007; 127:103-12. [PMID: 17257735 DOI: 10.1016/j.bpc.2007.01.002] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2006] [Revised: 01/03/2007] [Accepted: 01/04/2007] [Indexed: 11/22/2022]
Abstract
To understand the stabilization mechanism of the transient intermediate state in protein folding, it is very important to understand the structure and stability of the molten globule state under a native condition, in which the native state exists stably. The thermal transitions of horse cytochrome c were thermodynamically evaluated by highly precise differential scanning calorimetry (DSC) at pH 3.8-5.0. The heat capacity functions were analyzed using double deconvolution and the nonlinear least-squares method. An intermediate (I) state is clearly confirmed in the thermal native (N)-to-denatured (D) transition of horse cytochrome c. The mole fraction of the intermediate state shows the largest value, 0.4, at nearly 70 degrees C at pH 4.1. This intermediate state was also detected by the circular dichroism (CD) method and was found to have the properties of the molten globule-like structure by three-state analysis of the CD data. The Gibbs free-energy change between N and I, DeltaG(NI), and that between N and D, DeltaG(ND), were evaluated to be 9-22 kJ mol(-1) and 41-45 kJ mol(-1), respectively at 15( ) degrees C and pH 4.1.
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Affiliation(s)
- Shigeyoshi Nakamura
- Department of Bioengineering, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka 940-2188, Japan
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Maestro B, Sanz JM. Extensive unfolding of the C-LytA choline-binding module by submicellar concentrations of sodium dodecyl sulphate. FEBS Lett 2007; 581:375-81. [PMID: 17222408 DOI: 10.1016/j.febslet.2006.12.042] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2006] [Revised: 12/04/2006] [Accepted: 12/18/2006] [Indexed: 11/22/2022]
Abstract
We have investigated the stability of the choline-binding module C-LytA against sodium dodecyl sulphate (SDS)-induced unfolding at pH 7.0 and 20 degrees C. A major intermediate with an unfolded N-terminal region accumulates at around 0.75 mM SDS, whereas 2.0 mM SDS was sufficient for a complete unfolding. This might be the first report of a protein being extensively unfolded by submicellar concentrations of SDS, occurring through formation of detergent clusters on the protein surface. All transitions were reversible upon SDS complexation with beta-cyclodextrin, allowing the calculation of thermodynamic parameters. A model for the unfolding of C-LytA by SDS is presented and compared to a previous denaturation scheme by guanidine hydrochloride.
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Affiliation(s)
- Beatriz Maestro
- Instituto de Biologia Molecular y Celular, Universidad Miguel Hernández, Av. Universidad, s/n 03202 Elche, Alicante, Spain
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50
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Liang L, Yao P, Jiang M. Reversibility of Structural Transition of Cytochrome c on Interacting with and Releasing from Alternating Copolymers of Maleic Acid and Alkene. Biomacromolecules 2006; 7:1829-35. [PMID: 16768404 DOI: 10.1021/bm060150n] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The interaction of cytochrome c (cyt c) with poly(isobutylene-alt-maleic acid) (PIMA) and poly(1-tetradecene-alt-maleic acid) (PTMA) was studied using circular dichroism, absorption spectroscopy, and atomic force microscopy to investigate the electrostatic and hydrophobic influence of the copolymers on the structure of cyt c. At pH 7.4, the interaction of PIMA with cyt c can only partly disturb the integrity of the heme pocket, while PTMA has very intensive influence on the structure of cyt c. After adding 0.15 M NaCl, PIMA-cyt c complexes dissociate, and the released cyt c recovers its native structure, whereas NaCl has no significant influence on PTMA-cyt c complexes. GuHCl (0.5 M) destroys PTMA-cyt c complexes, forming GuHCl-PTMA precipitates; the cyt c released from the complexes regenerates its native structure. In comparison with electrostatic interaction, hydrophobic interaction leads to more stable polymer-cyt c complexes and more intensive influence on cyt c structure, but cyt c can recover its native state after release.
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Affiliation(s)
- Li Liang
- The Key Laboratory of Molecular Engineering of Polymer and Department of Macromolecular Science, Fudan University, Shanghai 200433, China
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