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López O, Cócera M, Coderch L, Parra JL, Barsukov L, de la Maza A. Octyl Glucoside-Mediated Solubilization and Reconstitution of Liposomes: Structural and Kinetic Aspects. J Phys Chem B 2001. [DOI: 10.1021/jp010273w] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Olga López
- Departamento de Tensioactivos, Instituto de Investigaciones Químicas y Ambientales de Barcelona (IIQAB), Consejo Superior de Investigaciones Científicas (CSIC), C/ Jordi Girona, 18-26, 08034 Barcelona, Spain, and Shemyakin-Ovchinnikov Institute of Biorganic Chemistry, Russian Academy of Sciences, UI. Miklukho-Maklaya, 16/10, 117871 Moscow V-437, Russia
| | - Mercedes Cócera
- Departamento de Tensioactivos, Instituto de Investigaciones Químicas y Ambientales de Barcelona (IIQAB), Consejo Superior de Investigaciones Científicas (CSIC), C/ Jordi Girona, 18-26, 08034 Barcelona, Spain, and Shemyakin-Ovchinnikov Institute of Biorganic Chemistry, Russian Academy of Sciences, UI. Miklukho-Maklaya, 16/10, 117871 Moscow V-437, Russia
| | - Luisa Coderch
- Departamento de Tensioactivos, Instituto de Investigaciones Químicas y Ambientales de Barcelona (IIQAB), Consejo Superior de Investigaciones Científicas (CSIC), C/ Jordi Girona, 18-26, 08034 Barcelona, Spain, and Shemyakin-Ovchinnikov Institute of Biorganic Chemistry, Russian Academy of Sciences, UI. Miklukho-Maklaya, 16/10, 117871 Moscow V-437, Russia
| | - Jose Luis Parra
- Departamento de Tensioactivos, Instituto de Investigaciones Químicas y Ambientales de Barcelona (IIQAB), Consejo Superior de Investigaciones Científicas (CSIC), C/ Jordi Girona, 18-26, 08034 Barcelona, Spain, and Shemyakin-Ovchinnikov Institute of Biorganic Chemistry, Russian Academy of Sciences, UI. Miklukho-Maklaya, 16/10, 117871 Moscow V-437, Russia
| | - Leonid Barsukov
- Departamento de Tensioactivos, Instituto de Investigaciones Químicas y Ambientales de Barcelona (IIQAB), Consejo Superior de Investigaciones Científicas (CSIC), C/ Jordi Girona, 18-26, 08034 Barcelona, Spain, and Shemyakin-Ovchinnikov Institute of Biorganic Chemistry, Russian Academy of Sciences, UI. Miklukho-Maklaya, 16/10, 117871 Moscow V-437, Russia
| | - Alfonso de la Maza
- Departamento de Tensioactivos, Instituto de Investigaciones Químicas y Ambientales de Barcelona (IIQAB), Consejo Superior de Investigaciones Científicas (CSIC), C/ Jordi Girona, 18-26, 08034 Barcelona, Spain, and Shemyakin-Ovchinnikov Institute of Biorganic Chemistry, Russian Academy of Sciences, UI. Miklukho-Maklaya, 16/10, 117871 Moscow V-437, Russia
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Goñi FM, Alonso A. Spectroscopic techniques in the study of membrane solubilization, reconstitution and permeabilization by detergents. BIOCHIMICA ET BIOPHYSICA ACTA 2000; 1508:51-68. [PMID: 11090818 DOI: 10.1016/s0304-4157(00)00011-3] [Citation(s) in RCA: 69] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
This review focuses on the use of spectroscopic techniques for the study of membrane solubilization, reconstitution, and permeabilization by detergents. Turbidity and light scattering, visible and infrared spectroscopic methods, fluorescence, nuclear magnetic resonance, electron spin resonance and X-ray diffraction are examined from the point of view of their applicability to the above detergent-mediated phenomena. A short introduction is provided about each of the techniques, and references are given for further study.
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Affiliation(s)
- F M Goñi
- Unidad de Biofísica (CSIC-UPV/EHU) and Departamento de Bioquímica, Universidad del País Vasco, Aptdo. 644, 48080, Bilbao, Spain
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Das TK, Mazumdar S. Effect of Adriamycin on the boundary lipid structure of cytochrome c oxidase: pico-second time-resolved fluorescence depolarization studies. Biophys Chem 2000; 86:15-28. [PMID: 11011696 DOI: 10.1016/s0301-4622(00)00158-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The fluorescence dynamics of the dye 3,3'-diethyloxadicarbocyanine iodide (DODCI) was used to probe the microenvironment of cytochrome c oxidase (CcO) and cardiolipin. The dye was partitioned between an aqueous and a hydrophobic phase. The 'bound' and 'free' populations of DODCI could be separated by analysis of the time-resolved fluorescence decay of the dye. The anisotropy decay of the DODCI bound to CcO showed a unique 'dip and rise' shape that was analyzed by a combination of rotational correlation times with time-dependent weight factors for each lifetime component. Rotational dynamics studies revealed the existence of a restricted motion of the dye bound at the enzyme surface. Adriamycin, an anticancer, albeit cardiotoxic drug, was previously proposed to affect the surface structure of CcO, most likely by causing a disorder to the surface lipid arrangement. A drastic change in the rotational correlation time of the dye bound to the enzyme surface was observed, which suggested a depletion of cardiolipin layer due to complexation with the drug. The effect of Adriamycin on cardiolipin was drastic, leading to its phase separation. The present study suggests that the effect of Adriamycin on CcO is primarily a segregation of the cardiolipins.
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Affiliation(s)
- T K Das
- Albert Einstein College of Medicine, Bronx, NY 10461, USA.
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de Foresta B, Gallay J, Sopkova J, Champeil P, Vincent M. Tryptophan octyl ester in detergent micelles of dodecylmaltoside: fluorescence properties and quenching by brominated detergent analogs. Biophys J 1999; 77:3071-84. [PMID: 10585929 PMCID: PMC1300578 DOI: 10.1016/s0006-3495(99)77138-9] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
Abstract
The fluorescence properties of tryptophan octyl ester (TOE), a hydrophobic model of Trp in proteins, were investigated in various mixed micelles of dodecylmaltoside (DM) and 7,8-dibromododecyl beta-maltoside (BrDM) or 10,11-dibromoundecanoyl beta-maltoside (BrUM). This study focuses on the mechanism via which these brominated detergents quench the fluorescence of TOE in a micellar system. The experiments were performed at a pH at which TOE is uncharged and almost completely bound to detergent micelles. TOE binding was monitored by its enhanced fluorescence in pure DM micelles or its quenched fluorescence in pure BrUM or BrDM micelles. In DM/BrUM and DM/BrDM mixed micelles, the fluorescence intensity of TOE decreased, as a nonlinear function of the molar fraction of brominated detergent, to almost zero in pure brominated detergent. The indole moiety of TOE is therefore highly accessible to the bromine atoms located on the detergent alkyl chain because quenching by bromines occurs by direct contact with the fluorophore. TOE is simultaneously poorly accessible to iodide (I(-)), a water-soluble collisional quencher. TOE time-resolved fluorescence intensity decay is heterogeneous in pure DM micelles, with four lifetimes (from 0.2 to 4.4 ns) at the maximum emission wavelength. Such heterogeneity may arise from dipolar relaxation processes in a motionally restricted medium, as suggested by the time-dependent (nanoseconds) red shift (11 nm) of the TOE emission spectrum, and from the existence of various TOE conformations. Time-resolved quenching experiments for TOE in mixed micelles showed that the excited-state lifetime values decreased only slightly with increases in the proportion of BrDM or BrUM. In contrast, the relative amplitude of the component with the longest lifetime decreased significantly relative to that of the short-lived species. This is consistent with a mainly static mechanism for the quenching of TOE by brominated detergents. Molecular modeling of TOE (in vacuum and in water) suggested that the indole ring was stabilized by folding back upon the octyl chain, forming a hairpin conformation. Within micelles, the presence of such folded conformations, making it possible for the entire molecule to be located in the hydrophobic part of the micelle, is consistent with the results of fluorescence quenching experiments. TOE rotational correlation time values, in the nanosecond range, were consistent with a hindered rotation of the indole moiety and a rotation of the complete TOE molecule in the pure DM or mixed detergent micelles. These results, obtained with a simple micellar model system, provide a basis for the interpretation of fluorescence quenching by brominated detergents in more complex systems such as protein- or peptide-detergent complexes.
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Affiliation(s)
- B de Foresta
- Section de Biophysique des Protéines et des Membranes, Département de Biologie Cellulaire et Moléculaire et URA 2096 (CNRS), CEA Saclay, 91191 Gif-sur-Yvette, France.
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6
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Unfolding pathway of cytochromec oxidase induced by ionic surfactants: Circular dichroism and picosecond time-resolved fluorescence studies. J CHEM SCI 1998. [DOI: 10.1007/bf02871280] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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