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Piacenza E, Sule K, Presentato A, Wells F, Turner RJ, Prenner EJ. Impact of Biogenic and Chemogenic Selenium Nanoparticles on Model Eukaryotic Lipid Membranes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:10406-10419. [PMID: 37462214 PMCID: PMC10399287 DOI: 10.1021/acs.langmuir.3c00718] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/02/2023]
Abstract
Microbial nanotechnology is an expanding research area devoted to producing biogenic metal and metalloid nanomaterials (NMs) using microorganisms. Often, biogenic NMs are explored as antimicrobial, anticancer, or antioxidant agents. Yet, most studies focus on their applications rather than the underlying mechanism of action or toxicity. Here, we evaluate the toxicity of our well-characterized biogenic selenium nanoparticles (bSeNPs) produced by the Stenotrophomonas maltophilia strain SeITE02 against the model yeast Saccharomyces cerevisiae comparing it with chemogenic SeNPs (cSeNPs). Knowing from previous studies that the biogenic extract contained bSeNPs in an organic material (OM) and supported here by Fourier transform infrared spectroscopy, we removed and incubated it with cSeNPs (cSeNPs_OM) to assess its influence on the toxicity of these formulations. Specifically, we focused on the first stages of the eukaryotic cell exposure to these samples─i.e., their interaction with the cell lipid membrane, which was mimicked by preparing vesicles from yeast polar lipid extract or phosphatidylcholine lipids. Fluidity changes derived from biogenic and chemogenic samples revealed that the bSeNP extract mediated the overall rigidification of lipid vesicles, while cSeNPs showed negligible effects. The OM and cSeNPs_OM induced similar modifications to the bSeNP extract, reiterating the need to consider the OM influence on the physical-chemical and biological properties of bSeNP extracts.
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Affiliation(s)
- Elena Piacenza
- Department of Biological, Chemical and Pharmaceutical Science and Technologies, University of Palermo, Viale delle Scienze, Ed. 16, 90128 Palermo, Italy
| | - Kevin Sule
- Department of Biological Sciences, University of Calgary, 2500 University Dr. NW, Alberta, Calgary T2N 1N4, Canada
| | - Alessandro Presentato
- Department of Biological, Chemical and Pharmaceutical Science and Technologies, University of Palermo, Viale delle Scienze, Ed. 16, 90128 Palermo, Italy
| | - Frieda Wells
- Department of Biological Sciences, University of Calgary, 2500 University Dr. NW, Alberta, Calgary T2N 1N4, Canada
| | - Raymond J Turner
- Department of Biological Sciences, University of Calgary, 2500 University Dr. NW, Alberta, Calgary T2N 1N4, Canada
| | - Elmar J Prenner
- Department of Biological Sciences, University of Calgary, 2500 University Dr. NW, Alberta, Calgary T2N 1N4, Canada
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Zapata-Mercado E, Azarova EV, Hristova K. Effect of reversible osmotic stress on live cell plasma membranes, probed via Laurdan general polarization measurements. Biophys J 2022; 121:2411-2418. [PMID: 35596525 DOI: 10.1016/j.bpj.2022.05.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2021] [Revised: 09/10/2021] [Accepted: 05/16/2022] [Indexed: 11/02/2022] Open
Abstract
Here we seek to gain insight into changes in the plasma membrane of live cells upon the application of osmotic stress using Laurdan, a fluorescent probe that reports on membrane organization, hydration, and dynamics. It is known that the application of osmotic stress to lipid vesicles causes a decrease in Laurdan's generalized polarization (GP), which has been interpreted as an indication of membrane stretching. In cells, we see the opposite effects, as GP increases when the osmolarity of the solution is decreased. This increase in GP is associated with the presence of caveolae, which are known to disassemble and flatten in response to osmotic stress.
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Affiliation(s)
- Elmer Zapata-Mercado
- Department of Materials Science and Engineering, Institute for NanoBioTechnology, and Program in Molecular Biophysics, Johns Hopkins University, Baltimore, MD 21218
| | - Evgenia V Azarova
- Department of Materials Science and Engineering, Institute for NanoBioTechnology, and Program in Molecular Biophysics, Johns Hopkins University, Baltimore, MD 21218
| | - Kalina Hristova
- Department of Materials Science and Engineering, Institute for NanoBioTechnology, and Program in Molecular Biophysics, Johns Hopkins University, Baltimore, MD 21218.
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Bernier SC, Millette MA, Roy S, Cantin L, Coutinho A, Salesse C. Structural information and membrane binding of truncated RGS9-1 Anchor Protein and its C-terminal hydrophobic segment. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2021; 1863:183566. [PMID: 33453187 DOI: 10.1016/j.bbamem.2021.183566] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 09/11/2019] [Revised: 12/22/2020] [Accepted: 01/10/2021] [Indexed: 01/19/2023]
Abstract
Visual phototransduction takes place in photoreceptor cells. Light absorption by rhodopsin leads to the activation of transducin as a result of the exchange of its GDP for GTP. The GTP-bound ⍺-subunit of transducin then activates phosphodiesterase (PDE), which in turn hydrolyzes cGMP leading to photoreceptor hyperpolarization. Photoreceptors return to the dark state upon inactivation of these proteins. In particular, PDE is inactivated by the protein complex R9AP/RGS9-1/Gβ5. R9AP (RGS9-1 anchor protein) is responsible for the membrane anchoring of this protein complex to photoreceptor outer segment disk membranes most likely by the combined involvement of its C-terminal hydrophobic domain as well as other types of interactions. This study thus aimed to gather information on the structure and membrane binding of the C-terminal hydrophobic segment of R9AP as well as of truncated R9AP (without its C-terminal domain, R9AP∆TM). Circular dichroism and infrared spectroscopic measurements revealed that the secondary structure of R9AP∆TM mainly includes ⍺-helical structural elements. Moreover, intrinsic fluorescence measurements of native R9AP∆TM and individual mutants lacking one tryptophan demonstrated that W79 is more buried than W173 but that they are both located in a hydrophobic environment. This method also revealed that membrane binding of R9AP∆TM does not involve regions near its tryptophan residues, while infrared spectroscopy validated its binding to lipid vesicles. Additional fluorescence measurements showed that the C-terminal segment of R9AP is membrane embedded. Maximum insertion pressure and synergy data using Langmuir monolayers suggest that interactions with specific phospholipids could be involved in the membrane binding of R9AP∆TM.
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Affiliation(s)
- Sarah C Bernier
- CUO-Recherche, Centre de recherche du CHU de Québec and Département d'ophtalmologie, Faculté de Médecine, and Regroupement Stratégique PROTEO, Université Laval, Québec, Québec, Canada
| | - Marc-Antoine Millette
- CUO-Recherche, Centre de recherche du CHU de Québec and Département d'ophtalmologie, Faculté de Médecine, and Regroupement Stratégique PROTEO, Université Laval, Québec, Québec, Canada
| | - Sarah Roy
- CUO-Recherche, Centre de recherche du CHU de Québec and Département d'ophtalmologie, Faculté de Médecine, and Regroupement Stratégique PROTEO, Université Laval, Québec, Québec, Canada
| | - Line Cantin
- CUO-Recherche, Centre de recherche du CHU de Québec and Département d'ophtalmologie, Faculté de Médecine, and Regroupement Stratégique PROTEO, Université Laval, Québec, Québec, Canada
| | - Ana Coutinho
- iBB-Institute for Bioengineering and Biosciences, Department of Bioengineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal; Department of Chemistry and Biochemistry, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal
| | - Christian Salesse
- CUO-Recherche, Centre de recherche du CHU de Québec and Département d'ophtalmologie, Faculté de Médecine, and Regroupement Stratégique PROTEO, Université Laval, Québec, Québec, Canada.
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Ortuso RD, Ricardi N, Bürgi T, Wesolowski TA, Sugihara K. The deconvolution analysis of ATR-FTIR spectra of diacetylene during UV exposure. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2019; 219:23-32. [PMID: 31030044 DOI: 10.1016/j.saa.2019.04.030] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2019] [Revised: 04/10/2019] [Accepted: 04/14/2019] [Indexed: 06/09/2023]
Abstract
We performed a detailed deconvolution analysis of ATR-FTIR peaks of a common diacetylene, 10,12-tricosadiynoic acid (TRCDA) during the polymerization and the blue-to-red transition. Based on the analysis and the solvent dependence on the IR signals, we found that the triple peak from CC stretching mode that has been previously suspected as a consequence of Fermi resonance is rather associated with the macromolecular assembly of TRCDA. Besides these CC triple peaks, we found that the background in the region increased during the UV exposure due to the CC signals from polymers. In addition, the anisotropic compression during polymerization was also detected, which supports the proposed interpretation of X-ray data reported previously. These results are the benefits from the deconvolution analysis.
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Affiliation(s)
- Roberto D Ortuso
- Department of physical chemistry, University of Geneva, 30 Quai Ernest Ansermet, Geneva, 1211, Switzerland
| | - Niccolò Ricardi
- Department of physical chemistry, University of Geneva, 30 Quai Ernest Ansermet, Geneva, 1211, Switzerland
| | - Thomas Bürgi
- Department of physical chemistry, University of Geneva, 30 Quai Ernest Ansermet, Geneva, 1211, Switzerland
| | - Tomasz A Wesolowski
- Department of physical chemistry, University of Geneva, 30 Quai Ernest Ansermet, Geneva, 1211, Switzerland
| | - Kaori Sugihara
- Department of physical chemistry, University of Geneva, 30 Quai Ernest Ansermet, Geneva, 1211, Switzerland.
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Abstract
Isoforms of creatine kinase (CK) generate and use phosphocreatine, a concentrated and highly diffusible cellular "high energy" intermediate, for the main purpose of energy buffering and transfer in order to maintain cellular energy homeostasis. The mitochondrial CK isoform (mtCK) localizes to the mitochondrial intermembrane and cristae space, where it assembles into peripherally membrane-bound, large cuboidal homooctamers. These are part of proteolipid complexes wherein mtCK directly interacts with cardiolipin and other anionic phospholipids, as well as with the VDAC channel in the outer membrane. This leads to a stabilization and cross-linking of inner and outer mitochondrial membrane, forming so-called contact sites. Also the adenine nucleotide translocator of the inner membrane can be recruited into these proteolipid complexes, probably mediated by cardiolipin. The complexes have functions mainly in energy transfer to the cytosol and stimulation of oxidative phosphorylation, but also in restraining formation of reactive oxygen species and apoptosis. In vitro evidence indicates a putative role of mtCK in mitochondrial phospholipid distribution, and most recently a role in thermogenesis has been proposed. This review summarizes the essential structural and functional data of these mtCK complexes and describes in more detail the more recent advances in phospholipid interaction, thermogenesis, cancer and evolution of mtCK.
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Cheniour M, Brewer J, Bagatolli L, Marcillat O, Granjon T. Evidence of proteolipid domain formation in an inner mitochondrial membrane mimicking model. Biochim Biophys Acta Gen Subj 2017; 1861:969-976. [PMID: 28185927 DOI: 10.1016/j.bbagen.2017.02.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2016] [Revised: 01/29/2017] [Accepted: 02/01/2017] [Indexed: 12/16/2022]
Abstract
BACKGROUND Mitochondrial creatine kinase (mtCK) is highly abundant in mitochondria; its quantity is equimolecular to the Adenylic Nucleotide Translocator and represents 1% of the mitochondrial proteins. It is a multitask protein localized in the mitochondria intermembrane space where it binds to the specific cardiolipin (CL) phospholipid. If mtCK was initially thought to be exclusively implicated in energy transfer between mitochondria and cytosol through a mechanism referred to as the phosphocreatine shuttle, several recent studies suggested an additional role in maintaining mitochondria membrane structure. METHODS To further characterized mtCK binding process we used multiphoton excitation fluorescence microscopy coupled with Giant Unilamellar Vesicles (GUV) and laurdan as fluorescence probe. RESULTS We gathered structural and dynamical information on the molecular events occurring during the binding of mtCK to the mitochondria inner membrane. We present the first visualization of mtCK-induced CL segregation on a bilayer model forming micrometer-size proteolipid domains at the surface of the GUV. Those microdomains, which only occurred when CL is included in the lipid mixture, were accompanied by the formation of protein multimolecular assembly, vesicle clamping, and changes in both vesicle curvature and membrane fluidity CONCLUSION: Those results highlighted the importance of the highly abundant mtCK in the lateral organization of the mitochondrial inner membrane. GENERAL SIGNIFICANCE Microdomains were induced in mitochondria-mimicking membranes composed of natural phospholipids without cholesterol and/or sphingolipids differing from the proposed cytoplasmic membrane rafts. Those findings as well as membrane curvature modification were discussed in relation with protein-membrane interaction and protein cluster involvement in membrane morphology.
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Affiliation(s)
- Mouhedine Cheniour
- Univ Lyon, Université Claude Bernard Lyon 1, ICBMS - UMR CNRS 5246, MEM2, F-69622 Villeurbanne, France
| | - Jonathan Brewer
- Membrane Biophysics and Biophotonics group/MEMPHYS Dept. Biochemistry and Molecular Biology, University of Southern, Denmark
| | - Luis Bagatolli
- Membrane Biophysics and Biophotonics group/MEMPHYS Dept. Biochemistry and Molecular Biology, University of Southern, Denmark
| | - Olivier Marcillat
- Univ Lyon, Université Claude Bernard Lyon 1, Centre de Recherche en Cancérologie de Lyon, F- 69373 Lyon, France
| | - Thierry Granjon
- Univ Lyon, Université Claude Bernard Lyon 1, ICBMS - UMR CNRS 5246, MEM2, F-69622 Villeurbanne, France.
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Francois-Moutal L, Ouberai MM, Maniti O, Welland ME, Strzelecka-Kiliszek A, Wos M, Pikula S, Bandorowicz-Pikula J, Marcillat O, Granjon T. Two-Step Membrane Binding of NDPK-B Induces Membrane Fluidity Decrease and Changes in Lipid Lateral Organization and Protein Cluster Formation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:12923-12933. [PMID: 27934520 DOI: 10.1021/acs.langmuir.6b03789] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Nucleoside diphosphate kinases (NDPKs) are crucial elements in a wide array of cellular physiological or pathophysiological processes such as apoptosis, proliferation, or metastasis formation. Among the NDPK isoenzymes, NDPK-B, a cytoplasmic protein, was reported to be associated with several biological membranes such as plasma or endoplasmic reticulum membranes. Using several membrane models (liposomes, lipid monolayers, and supported lipid bilayers) associated with biophysical approaches, we show that lipid membrane binding occurs in a two-step process: first, initiation by a strong electrostatic adsorption process and followed by shallow penetration of the protein within the membrane. The NDPK-B binding leads to a decrease in membrane fluidity and formation of protein patches. The ability of NDPK-B to form microdomains at the membrane level may be related to protein-protein interactions triggered by its association with anionic phospholipids. Such accumulation of NDPK-B would amplify its effects in functional platform formation and protein recruitment at the membrane.
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Affiliation(s)
- Liberty Francois-Moutal
- Organisation et Dynamique des Membrane Biologiques, Institut de Chimie et Biochimie Moléculaires et Supramoléculaires, CNRS UMR 5246 ICBMS , Bâtiment Chevreul, 43 Boulevard du 11 Novembre 1918, Villeurbanne Cedex 69622, France
| | - Myriam M Ouberai
- Nanoscience Centre, University of Cambridge , 11 J.J. Thomson Avenue Cambridge, Cambridge CB3 0FF, U.K
| | - Ofelia Maniti
- Organisation et Dynamique des Membrane Biologiques, Institut de Chimie et Biochimie Moléculaires et Supramoléculaires, CNRS UMR 5246 ICBMS , Bâtiment Chevreul, 43 Boulevard du 11 Novembre 1918, Villeurbanne Cedex 69622, France
| | - Mark E Welland
- Nanoscience Centre, University of Cambridge , 11 J.J. Thomson Avenue Cambridge, Cambridge CB3 0FF, U.K
| | - Agnieszka Strzelecka-Kiliszek
- Department of Biochemistry, Nencki Institute of Experimental Biology, Polish Academy of Sciences , 3 Pasteur Street, Warsaw 02-093, Poland
| | - Marcin Wos
- Department of Biochemistry, Nencki Institute of Experimental Biology, Polish Academy of Sciences , 3 Pasteur Street, Warsaw 02-093, Poland
| | - Slawomir Pikula
- Department of Biochemistry, Nencki Institute of Experimental Biology, Polish Academy of Sciences , 3 Pasteur Street, Warsaw 02-093, Poland
| | - Joanna Bandorowicz-Pikula
- Department of Biochemistry, Nencki Institute of Experimental Biology, Polish Academy of Sciences , 3 Pasteur Street, Warsaw 02-093, Poland
| | - Olivier Marcillat
- Organisation et Dynamique des Membrane Biologiques, Institut de Chimie et Biochimie Moléculaires et Supramoléculaires, CNRS UMR 5246 ICBMS , Bâtiment Chevreul, 43 Boulevard du 11 Novembre 1918, Villeurbanne Cedex 69622, France
| | - Thierry Granjon
- Organisation et Dynamique des Membrane Biologiques, Institut de Chimie et Biochimie Moléculaires et Supramoléculaires, CNRS UMR 5246 ICBMS , Bâtiment Chevreul, 43 Boulevard du 11 Novembre 1918, Villeurbanne Cedex 69622, France
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Cheniour M, Gueyrard D, Goekjian PG, Granjon T, Marcillat O. A convenient and versatile synthesis of Laurdan-like fluorescent membrane probes: characterization of their fluorescence properties. RSC Adv 2016. [DOI: 10.1039/c5ra20369d] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A simple and versatile synthetic scheme leading to Laurdan-derived fluorescent probes for biological membranes. Libraries of Laurdan derivatives will allow addressing the effect of the polar group on probes capacity to monitor lipids physical state.
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Affiliation(s)
- M. Cheniour
- Université Claude Bernard Lyon 1
- F-69622 Villeurbanne
- France
- Institut de Chimie et Biochimie Moléculaires et Supramoléculaires
- ICBMS
| | - D. Gueyrard
- Université Claude Bernard Lyon 1
- F-69622 Villeurbanne
- France
- Université de Lyon
- Laboratoire Chimie Organique 2 – Glyco
| | - P. G. Goekjian
- Université Claude Bernard Lyon 1
- F-69622 Villeurbanne
- France
- Université de Lyon
- Laboratoire Chimie Organique 2 – Glyco
| | - T. Granjon
- Université Claude Bernard Lyon 1
- F-69622 Villeurbanne
- France
- Institut de Chimie et Biochimie Moléculaires et Supramoléculaires
- ICBMS
| | - O. Marcillat
- Université Claude Bernard Lyon 1
- F-69622 Villeurbanne
- France
- Institut de Chimie et Biochimie Moléculaires et Supramoléculaires
- ICBMS
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Maniti O, François-Moutal L, Lecompte MF, Vial C, Lagarde M, Guichardant M, Marcillat O, Granjon T. Protein "amyloid-like" networks at the phospholipid membrane formed by 4-hydroxy-2-nonenal-modified mitochondrial creatine kinase. Mol Membr Biol 2015; 32:1-10. [PMID: 25865250 DOI: 10.3109/09687688.2015.1023376] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
4-Hydroxy-2-nonenal (4-HNE) is a reactive aldehyde and a lipid peroxidation product formed in biological tissues under physiological and pathological conditions. Its concentration increases with oxidative stress and induces deleterious modifications of proteins and membranes. Mitochondrial and cytosolic isoforms of creatine kinase were previously shown to be affected by 4-HNE. In the present study, we analyzed the effect of 4-HNE on mitochondrial creatine kinase, an abundant protein from the mitochondrial intermembrane space with a key role in mitochondrial physiology. We show that this effect is double: 4-HNE induces a step-wise loss of creatine kinase activity together with a fast protein aggregation. Protein-membrane interaction is affected and amyloid-like networks formed on the biomimetic membrane. These fibrils may disturb mitochondrial organisation both at the membrane and in the inter membrane space.
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Affiliation(s)
- Ofelia Maniti
- Université de Lyon, Lyon; Université Lyon 1, CNRS, UMR 5246, ICBMS, IMBL , Villeurbanne , France
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Nakatsuka N, Barnaby SN, Tsiola A, Fath KR, Williams BA, Banerjee IA. Self-assembling peptide assemblies bound to ZnS nanoparticles and their interactions with mammalian cells. Colloids Surf B Biointerfaces 2013; 103:405-15. [DOI: 10.1016/j.colsurfb.2012.10.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2012] [Revised: 10/08/2012] [Accepted: 10/08/2012] [Indexed: 11/24/2022]
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Caspase-8 binding to cardiolipin in giant unilamellar vesicles provides a functional docking platform for bid. PLoS One 2013; 8:e55250. [PMID: 23418437 PMCID: PMC3572128 DOI: 10.1371/journal.pone.0055250] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2012] [Accepted: 12/21/2012] [Indexed: 12/28/2022] Open
Abstract
Caspase-8 is involved in death receptor-mediated apoptosis in type II cells, the proapoptotic programme of which is triggered by truncated Bid. Indeed, caspase-8 and Bid are the known intermediates of this signalling pathway. Cardiolipin has been shown to provide an anchor and an essential activating platform for caspase-8 at the mitochondrial membrane surface. Destabilisation of this platform alters receptor-mediated apoptosis in diseases such as Barth Syndrome, which is characterised by the presence of immature cardiolipin which does not allow caspase-8 binding. We used a simplified in vitro system that mimics contact sites and/or cardiolipin-enriched microdomains at the outer mitochondrial surface in which the platform consisting of caspase-8, Bid and cardiolipin was reconstituted in giant unilamellar vesicles. We analysed these vesicles by flow cytometry and confirm previous results that demonstrate the requirement for intact mature cardiolipin for caspase-8 activation and Bid binding and cleavage. We also used confocal microscopy to visualise the rupture of the vesicles and their revesiculation at smaller sizes due to alteration of the curvature following caspase-8 and Bid binding. Biophysical approaches, including Laurdan fluorescence and rupture/tension measurements, were used to determine the ability of these three components (cardiolipin, caspase-8 and Bid) to fulfil the minimal requirements for the formation and function of the platform at the mitochondrial membrane. Our results shed light on the active functional role of cardiolipin, bridging the gap between death receptors and mitochondria.
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Francois-Moutal L, Maniti O, Marcillat O, Granjon T. New insights into lipid-Nucleoside Diphosphate Kinase-D interaction mechanism: protein structural changes and membrane reorganisation. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2012; 1828:906-15. [PMID: 22974817 DOI: 10.1016/j.bbamem.2012.08.023] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2012] [Revised: 08/18/2012] [Accepted: 08/28/2012] [Indexed: 10/27/2022]
Abstract
Nucleoside Diphosphate Kinases (NDPKs) have long been considered merely as housekeeping enzymes. The discovery of the NME1 gene, an anti-metastatic gene coding for NDPK-A, led the scientific community to re-evaluate their role in the cell. It is now well established that the NDPK family is more complex than what was first thought, and despite the increasing amount of evidence suggesting the multifunctional role of nm23/NDPKs, the specific functions of each family member are still elusive. Among these isoforms, NDPK-D is the only one to present a mitochondria-targeting sequence. It has recently been shown that this protein is able to bind and cross-link with mitochondrial membranes, suggesting that NDPK-D can mediate contact sites and contributes to the mitochondrial intermembrane space structuring. To better understand the influence of NDPK-D on mitochondrial lipid organisation, we analysed its behaviour in different lipid environments. We found that NDPK-D not only interacts with CL or anionic lipids, but is also able to bind in a non negligible manner to zwitterionic PC. NDPK-D alters membrane organisation in terms of fluidity, hydration and lipid clustering, effects which depend on lipid structure. Changes in the protein structure after lipid binding were evidenced, both by fluorescence and infrared spectroscopy, regardless of membrane composition. Taking into account all these elements, a putative mechanism of interaction between NDPK-D and zwitterionic or anionic lipids was proposed.
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Affiliation(s)
- L Francois-Moutal
- Université de Lyon, Université Lyon 1, CNRS, UMR 5246, Institut de Chimie et Biochimie Moléculaires et Supramoléculaires, IMBL, 43 Bd du 11 Novembre 1918 F-69622 Villeurbanne, France
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Acyl chain composition determines cardiolipin clustering induced by mitochondrial creatine kinase binding to monolayers. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2011; 1808:1129-39. [DOI: 10.1016/j.bbamem.2011.01.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2010] [Revised: 12/21/2010] [Accepted: 01/10/2011] [Indexed: 01/18/2023]
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Distinct behaviour of the homeodomain derived cell penetrating peptide penetratin in interaction with different phospholipids. PLoS One 2010; 5:e15819. [PMID: 21209890 PMCID: PMC3012702 DOI: 10.1371/journal.pone.0015819] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2010] [Accepted: 11/24/2010] [Indexed: 11/19/2022] Open
Abstract
Background Penetratin is a protein transduction domain derived from the homeoprotein Antennapedia. Thereby it is currently used as a cell penetrating peptide to introduce diverse molecules into eukaryotic cells, and it could also be involved in the cellular export of transcription factors. Moreover, it has been shown that it is able to act as an antimicrobial agent. The mechanisms involved in all these processes are quite controversial. Methodology/Principal Findings In this article, we report spectroscopic, calorimetric and biochemical data on the penetratin interaction with three different phospholipids: phosphatidylcholine (PC) and phosphatidylethanolamine (PE) to mimic respectively the outer and the inner leaflets of the eukaryotic plasma membrane and phosphatidylglycerol (PG) to mimic the bacterial membrane. We demonstrate that with PC, penetratin is able to form vesicle aggregates with no major change in membrane fluidity and presents no well defined secondary structure organization. With PE, penetratin aggregates vesicles, increases membrane rigidity and acquires an α-helical structure. With PG membranes, penetratin does not aggregate vesicles but decreases membrane fluidity and acquires a structure with both α-helical and β–sheet contributions. Conclusions/Significance These data from membrane models suggest that the different penetratin actions in eukaryotic cells (membrane translocation during export and import) and on prokaryotes may result from different peptide and lipid structural arrangements. The data suggest that, for eukaryotic cell penetration, penetratin does not acquire classical secondary structure but requires a different conformation compared to that in solution.
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Domenech O, Dufrêne YF, Van Bambeke F, Tukens PM, Mingeot-Leclercq MP. Interactions of oritavancin, a new semi-synthetic lipoglycopeptide, with lipids extracted from Staphylococcus aureus. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2010; 1798:1876-85. [PMID: 20599683 DOI: 10.1016/j.bbamem.2010.06.011] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2010] [Revised: 05/25/2010] [Accepted: 06/11/2010] [Indexed: 12/01/2022]
Abstract
Oritavancin, a lipoglycopeptide with marked bactericidal activity against vancomycin-resistant Staphylococcus aureus and enterococci, induces calcein release from CL:POPE and POPG:POPE liposomes, an effect enhanced by an increase in POPG:POPE ratio, and decreased when replacing POPG by DPPG (Domenech et al., Biochim Biophys Acta 2009; 1788:1832-40). Using vesicles prepared from lipids extracted from S. aureus, we showed that oritavancin induces holes, erosion of the edges, and decrease of the thickness of the supported lipid bilayers (atomic force microscopy; AFM). Oritavancin also induced an increase of membrane permeability (calcein release) on a time- and dose-dependent manner. These effects were probably related to the ability of the drug to bind to lipid bilayers as shown by 8-anilino-1- naphthalene sulfonic acid (ANS) assay. Interaction of oritavancin with phospholipids at the level of their glycerol backbone and hydrophobic domain was studied by monitoring changes of Laurdan excitation generalized polarization (GP(ex)) and 1,6-diphenyl-1,3,5-hexatriene (DPH) fluorescence anisotropy upon temperature increase. Oritavancin increased GP(ex) values and the transition temperature, indicating a more ordered structure at the level of the glycerol backbone. Oritavancin slightly decreased DPH fluorescence depolarization intensities, suggesting an increase in fluidity at the level of acyl chains. Together, our data confirm the interaction of oritavancin with lipids and the potential role of a rigidifying effect at the level of glycerol backbone for membrane permeabilization. This work shows how AFM and biophysical methods may help in characterizing drug-membrane interactions, and sheds further light on the mode of action of oritavancin.
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Affiliation(s)
- Oscar Domenech
- Université catholique de Louvain, Louvain Drug Research Institute, Unité de pharmacologie cellulaire et moléculaire, UCL 73.70, avenue E. Mounier 73, B-1200 Bruxelles, Belgium
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16
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Structure-function relations in oxaloacetate decarboxylase complex. Fluorescence and infrared approaches to monitor oxomalonate and Na(+) binding effect. PLoS One 2010; 5:e10935. [PMID: 20543879 PMCID: PMC2881705 DOI: 10.1371/journal.pone.0010935] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2009] [Accepted: 05/08/2010] [Indexed: 11/19/2022] Open
Abstract
Background Oxaloacetate decarboxylase (OAD) is a member of the Na+ transport decarboxylase enzyme family found exclusively in anaerobic bacteria. OAD of Vibrio cholerae catalyses a key step in citrate fermentation, converting the chemical energy of the decarboxylation reaction into an electrochemical gradient of Na+ ions across the membrane, which drives endergonic membrane reactions such as ATP synthesis, transport and motility. OAD is a membrane-bound enzyme composed of α, β and γ subunits. The α subunit contains the carboxyltransferase catalytic site. Methodology/Principal Findings In this report, spectroscopic techniques were used to probe oxomalonate (a competitive inhibitor of OAD with respect to oxaloacetate) and Na+ effects on the enzyme tryptophan environment and on the secondary structure of the OAD complex, as well as the importance of each subunit in the catalytic mechanism. An intrinsic fluorescence approach, Red Edge Excitation Shift (REES), indicated that solvent molecule mobility in the vicinity of OAD tryptophans was more restricted in the presence of oxomalonate. It also demonstrated that, although the structure of OAD is sensitive to the presence of NaCl, oxomalonate was able to bind to the enzyme even in the absence of Na+. REES changes due to oxomalonate binding were also observed with the αγ and α subunits. Infrared spectra showed that OAD, αγ and α subunits have a main component band centered between 1655 and 1650 cm−1 characteristic of a high content of α helix structures. Addition of oxomalonate induced a shift of the amide-I band of OAD toward higher wavenumbers, interpreted as a slight decrease of β sheet structures and a concomitant increase of α helix structures. Oxomalonate binding to αγand α subunits also provoked secondary structure variations, but these effects were negligible compared to OAD complex. Conclusion Oxomalonate binding affects the tryptophan environment of the carboxyltransferase subunit, whereas Na+ alters the tryptophan environment of the β subunit, consistent with the function of these subunits within the enzyme complex. Formation of a complex between OAD and its substrates elicits structural changes in the α-helical as well as β-strand secondary structure elements.
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17
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Maniti O, Lecompte MF, Marcillat O, Vial C, Granjon T. Mitochondrial creatine kinase interaction with cardiolipin-containing biomimetic membranes is a two-step process involving adsorption and insertion. EUROPEAN BIOPHYSICS JOURNAL: EBJ 2010; 39:1649-55. [PMID: 20361183 DOI: 10.1007/s00249-010-0600-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2009] [Revised: 03/09/2010] [Accepted: 03/16/2010] [Indexed: 02/03/2023]
Abstract
Mitochondrial creatine kinase (mtCK) binding to the mitochondrial inner membrane largely determines its biological functions in cellular energy homeostasis, mitochondrial physiology, and dynamics. The membrane binding mechanism is, however, not completely understood. Recent data suggest that a hydrophobic component is involved in mtCK binding to cardiolipin at the outer face of the inner mitochondrial membrane, in addition to the well known electrostatically driven process. In this manuscript, using an electrochemical method derived from alternating current polarography for differential capacity measurements, we distinctly reveal that protein-cardiolipin interaction has a two-step mechanism. For short incubation time, protein adsorption to the phospholipid charged headgroup was the only process detected, whereas on a longer time scale evidence of protein insertion was observed.
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18
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Vernoux N, Maniti O, Marcillat O, Vial C, Granjon T. Mitochondrial creatine kinase interaction with heterogeneous monolayers: Effect on lipid lateral organization. Biochimie 2009; 91:752-64. [DOI: 10.1016/j.biochi.2009.03.014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2008] [Accepted: 03/20/2009] [Indexed: 10/20/2022]
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19
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Mitochondrial kinases and their molecular interaction with cardiolipin. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2009; 1788:2032-47. [PMID: 19409873 DOI: 10.1016/j.bbamem.2009.04.018] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2008] [Accepted: 04/24/2009] [Indexed: 11/22/2022]
Abstract
Mitochondrial isoforms of creatine kinase (MtCK) and nucleoside diphosphate kinase (NDPK-D) are not phylogenetically related but share functionally important properties. They both use mitochondrially generated ATP with the ultimate goal of maintaining proper nucleotide pools, are located in the intermembrane/cristae space, have symmetrical oligomeric structures, and show high affinity binding to anionic phospholipids, in particular cardiolipin. The structural basis and functional consequences of the cardiolipin interaction have been studied and are discussed in detail in this review. They mainly result in a functional interaction of MtCK and NDPK-D with inner membrane adenylate translocator, probably by forming proteolipid complexes. These interactions allow for privileged exchange of metabolites (channeling) that ultimately regulate mitochondrial respiration. Further functions of the MtCK/membrane interaction include formation of cardiolipin membrane patches, stabilization of mitochondria and a role in apoptotic signaling, as well as in case of both kinases, a role in facilitating lipid transfer between two membranes. Finally, disturbed cardiolipin interactions of MtCK, NDPK-D and other proteins like cytochrome c and truncated Bid are discussed more generally in the context of apoptosis and necrosis.
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20
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Maniti O, Lecompte MF, Marcillat O, Desbat B, Buchet R, Vial C, Granjon T. Mitochondrial creatine kinase binding to phospholipid monolayers induces cardiolipin segregation. Biophys J 2009; 96:2428-38. [PMID: 19289067 PMCID: PMC2907684 DOI: 10.1016/j.bpj.2008.12.3911] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2008] [Revised: 12/11/2008] [Accepted: 12/15/2008] [Indexed: 01/12/2023] Open
Abstract
It is well established that the octameric mitochondrial form of creatine kinase (mtCK) binds to the outer face of the inner mitochondrial membrane mainly via electrostatic interactions with cardiolipin (CL). However, little is known about the consequences of these interactions on membrane and protein levels. Brewster angle microscopy investigations provide, for the first time to our knowledge, images indicating that mtCK binding induced cluster formation on CL monolayers. The thickness of the clusters (10-12 nm) corresponds to the theoretical height of the mtCK-CL complex. Protein insertion into a condensed CL film, together with monolayer stabilization after protein addition, was observed by means of differential capacity measurements. Polarization modulation infrared reflection-absorption spectroscopy showed that the mean orientation of alpha-helices within the protein shifted upon CL binding from 30 degrees to 45 degrees with respect to the interface plane, demonstrating protein domain movements. A comparison of data obtained with CL and phosphatidylcholine/phosphatidylethanolamine/CL (2:1:1) monolayers indicates that mtCK is able to selectively recruit CL molecules within the mixed monolayer, consolidating and changing the morphology of the interfacial film. Therefore, CL-rich domains induced by mtCK binding could modulate mitochondrial inner membrane morphology into a raft-like organization and influence essential steps of mitochondria-mediated apoptosis.
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Affiliation(s)
- Ofelia Maniti
- Chemistry-Biochemistry, Université de Lyon, Lyon, France
- Unite Mixte de Recherche 5246, Centre National de la Recherche Scientifique, l'Institut Multidisciplinaire de Biochimie des Lipides, Institut de Chimie et Biochimie Moléculaires et Supramoléculaires, Université Lyon 1, Villeurbanne, France
| | | | | | - Bernard Desbat
- Unite Mixte de Recherche 5248, Centre de Biophysique Moléculaire Numérique, Centre National de la Recherche Scientifique, École Nationale d'Ingénieurs des Travaux Agricoles de Bordeaux, Université Bordeaux 1, Pessac, France
| | - René Buchet
- Chemistry-Biochemistry, Université de Lyon, Lyon, France
- Unite Mixte de Recherche 5246, Centre National de la Recherche Scientifique, l'Institut Multidisciplinaire de Biochimie des Lipides, Institut de Chimie et Biochimie Moléculaires et Supramoléculaires, Université Lyon 1, Villeurbanne, France
| | - Christian Vial
- Chemistry-Biochemistry, Université de Lyon, Lyon, France
- Unite Mixte de Recherche 5246, Centre National de la Recherche Scientifique, l'Institut Multidisciplinaire de Biochimie des Lipides, Institut de Chimie et Biochimie Moléculaires et Supramoléculaires, Université Lyon 1, Villeurbanne, France
| | - Thierry Granjon
- Chemistry-Biochemistry, Université de Lyon, Lyon, France
- Unite Mixte de Recherche 5246, Centre National de la Recherche Scientifique, l'Institut Multidisciplinaire de Biochimie des Lipides, Institut de Chimie et Biochimie Moléculaires et Supramoléculaires, Université Lyon 1, Villeurbanne, France
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21
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Maniti O, Cheniour M, Marcillat O, Vial C, Granjon T. Morphology modifications in negatively charged lipid monolayers upon mitochondrial creatine kinase binding. Mol Membr Biol 2009; 26:171-85. [PMID: 19180361 DOI: 10.1080/09687680802698639] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Mitochondrial creatine kinase (mtCK) may participate to membrane organization at the mitochondrial level by modulating lipid state and fluidity. The effect of the protein on lipid phase behaviour of different acyl chain length phosphatidylglycerol monolayers was analyzed from pressure-area isotherms and from the compressional modulus variation with respect to the surface pressure. Monolayer morphology was visualized by Brewster angle microscopy. No condensation effect was visible on dimyristoylphosphatidylglycerol (DMPG). For the other PG monolayers tested, dipalmitoylphosphatidylglycerol (DPPG) and distearoylphosphatidylglycerol (DSPG), mtCK facilitated the formation of a liquid condensed phase. The effect depended on the surface pressure at which transition phase occurred. The effect of mtCK was more pronounced for tetramyristoylcardiolipin (TMCL) monolayers, as liquid condensed regions appeared 10 mN/m below the transition phase of the pure TMCL monolayer. The observed domains were circular and rather uniform, indicating a stabilization of the condensed phase. The same effect, namely an overall condensation of the monolayer with formation of circular domains, was observed upon protein injection beneath TMCL monolayers in different condensation states at constant area. MtCK ability to induce and stabilize a LC phase on monolayers could have important consequences in membrane organization and emphasize its structural role at mitochondrial level.
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Affiliation(s)
- Ofelia Maniti
- Universite de Lyon, Lyon, and Universite Lyon 1, CNRS, UMR 5246, Institut de Chimie et Biochimie Moleculaires et Supramoleculaires, IMBL, Villeurbanne, France
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22
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Albani JR. New insights in the interpretation of tryptophan fluorescence : origin of the fluorescence lifetime and characterization of a new fluorescence parameter in proteins: the emission to excitation ratio. J Fluoresc 2007; 17:406-17. [PMID: 17458686 DOI: 10.1007/s10895-007-0183-3] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2007] [Accepted: 03/19/2007] [Indexed: 10/23/2022]
Abstract
Origin of tryptophan fluorescence is still up to these days a quiz which is not completely solved. Fluorescence emission properties of tryptophan within proteins are in general considered as the result of fluorophore interaction within its environment. For example, a low fluorescence quantum yield is supposed to be the consequence of an important fluorophore-environment interaction. However, are we sure that the fluorophore has been excited upon light absorption? What if fluorophore excitation did not occur as the result of internal conformation specific to the fluorophore environment? Are we sure that all absorbed energy is used for the excitation process? Fluorescence lifetimes of Trp residues are considered to originate from rotamers or conformers resulting from the rotation of the indole ring within the peptide bonds. However, how can we explain the fact that in most of the proteins, the two lifetimes 0.5 and 3 ns, attributed to the conformers, are also observed for free tryptophan in solution? The present work, performed on free tryptophan and tyrosine in solution and on different proteins, shows that absorption and excitation spectra overlap but their intensities at the different excitation wavelengths are not necessarily equal. Also, we found that fluorescence emission intensities recorded at different excitation wavelengths depend on the intensities at these excitation wavelengths and not on the optical densities. Thus, excitation is not equal to absorption. In our interpretation of the data, we consider that absorbed photons are not necessary used only for the excitation, part of them are used to reorganize fluorophore molecules in a new state (excited structure) and another part is used for the excitation process. A new parameter that characterizes the ratio of the number of emitted photons over the real number of photons used to excite the fluorophore can be defined. We call this parameter, the emission to excitation ratio. Since our results were observed for fluorophores free in solution and present within proteins, structural reorganization does not depend on the protein backbone. Thus, fluorescence lifetimes (0.5 and 3 ns) observed for tryptophan molecules result from the new structures obtained in the excited state. Our theory allows opening a new way in the understanding of the origin of protein fluorescence and fluorescence of aromatic amino acids.
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Affiliation(s)
- J R Albani
- Laboratoire de Biophysique Moléculaire, Université des Sciences et Technologies de Lille, Bâtiment C6, 59655 Villeneuve d'Ascq Cédex, France.
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23
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Vernoux N, Maniti O, Besson F, Granjon T, Marcillat O, Vial C. Mitochondrial creatine kinase adsorption to biomimetic membranes: a Langmuir monolayer study. J Colloid Interface Sci 2007; 310:436-45. [PMID: 17359991 DOI: 10.1016/j.jcis.2007.01.093] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2006] [Revised: 01/29/2007] [Accepted: 01/29/2007] [Indexed: 11/16/2022]
Abstract
Interaction of mitochondrial creatine kinase (mtCK) with either synthetic or natural zwitterionic or acidic phospholipids was monitored by surface pressure measurements. Injection of mtCK beneath a monolayer at very low surface pressure results in a large increase in the apparent area per lipid molecule reflecting the intrinsic surface activity of the protein. This effect is particularly pronounced with anionic phospholipid-containing films. Upon compression to high lateral pressure, the protein is squeezed out of the lipid monolayer. On the contrary, mtCK injected beneath a monolayer compressed at 30 mN/m, does not insert into the monolayer but is concentrated below the surface by anionic phospholipids as evidenced by the immediate and strong increase in the apparent molecular area occurring upon decompression. Below 8 mN/m the protein adsorbs to the interface and remains intercalated until the lateral pressure increases again. The critical pressure of insertion is higher for anionic lipid-containing monolayers than for films containing only zwitterionic phospholipids. In the former case it is markedly diminished by NaCl. The adsorption of mtCK depends on the percentage of negative charges carried by the monolayer and is reduced by increasing NaCl concentrations. However, the residual interaction existing in the absence of a global negative charge on the membrane may indicate that this interaction also involves a hydrophobic component.
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Affiliation(s)
- Nathalie Vernoux
- CNRS UMR 5246/IMBL, Biomembranes et enzymes associés, Université Lyon 1, 43 boulevard du 11 Novembre 1918, F-69622 Villeurbanne cedex, France
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24
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Nemkovich N, Baumann W. Molecular Stark-effect spectroscopy of Prodan and Laurdan in different solvents and electric dipole moments in their equilibrated ground and Franck–Condon excited state. J Photochem Photobiol A Chem 2007. [DOI: 10.1016/j.jphotochem.2006.05.002] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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25
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Epand RF, Tokarska-Schlattner M, Schlattner U, Wallimann T, Epand RM. Cardiolipin clusters and membrane domain formation induced by mitochondrial proteins. J Mol Biol 2006; 365:968-80. [PMID: 17097675 DOI: 10.1016/j.jmb.2006.10.028] [Citation(s) in RCA: 85] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2006] [Revised: 10/04/2006] [Accepted: 10/08/2006] [Indexed: 11/29/2022]
Abstract
We show in this study that mitochondrial creatine kinase promotes segregation and clustering of cardiolipin in mixed membranes, a phenomenon that has been proposed to occur at contact sites in the mitochondria. This property of mitochondrial creatine kinase is dependent on the native octameric structure of the protein and does not occur after heat-denaturation or with the native dimeric form of the protein. Cardiolipin segregation was demonstrated by differential scanning calorimetry using membranes containing cardiolipin and either dipalmitoylphosphatidylethanolamine or 1-palmitoyl-2-oleoylphosphatidylethanolamine. Addition of the ubiquitous form of mitochondrial creatine kinase leads to the formation of a phosphatidylethanolamine-rich domain as a result of the protein binding preferentially to the cardiolipin. Such phase separation does not occur if cardiolipin is replaced with dioleoyl phosphatidylglycerol. Lipid phase separation is observed with other cardiolipin-binding proteins, including cytochrome c and, to a very small extent, with truncated Bid (t-Bid), as well as with the cationic polypeptide poly-L-lysine, but among these proteins the octameric form of mitochondrial creatine kinase is by far the most effective in causing segregation and clustering of cardiolipin. The proteins included in this study are found at mitochondrial contact sites where they are known to associate with cardiolipin. Domains in mitochondria enriched in cardiolipin play an important role in apoptosis and in energy flux processes.
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Affiliation(s)
- Raquel F Epand
- Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada L8N 3Z5
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26
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Epand RF, Schlattner U, Wallimann T, Lacombe ML, Epand RM. Novel lipid transfer property of two mitochondrial proteins that bridge the inner and outer membranes. Biophys J 2006; 92:126-37. [PMID: 17028143 PMCID: PMC1697860 DOI: 10.1529/biophysj.106.092353] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
This study provides evidence of a novel function for mitochondrial creatine kinase (MtCK) and nucleoside diphosphate kinase (NDPK-D). Both are basic peripheral membrane proteins with symmetrical homo-oligomeric structure, which in the case of MtCK was already shown to allow crossbridging of lipid bilayers. Here, different lipid dilution assays clearly demonstrate that both kinases also facilitate lipid transfer from one bilayer to another. Lipid transfer occurs between liposomes mimicking the lipid composition of mitochondrial contact sites, containing 30 mol % cardiolipin, but transfer does not occur when cardiolipin is replaced by phosphatidylglycerol. Ubiquitous MtCK, but not NDPK-D, shows some specificity in the nature of the lipids transferred and it is not active with phosphatidylcholine alone. MtCK can undergo reversible oligomerization between dimeric and octameric forms, but only the octamer can bridge membranes and promote lipid transfer. Cytochrome c, another basic mitochondrial protein known to bind to anionic membranes but not crosslinking them, is also incapable of promoting lipid transfer. The lipid transfer process does not involve vesicle fusion or loss of the internal contents of the liposomes.
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Affiliation(s)
- Raquel F Epand
- Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada.
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27
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Albani JR. Progesterone binding to the tryptophan residues of human alpha1-acid glycoprotein. Carbohydr Res 2006; 341:2557-64. [PMID: 16901474 DOI: 10.1016/j.carres.2006.07.012] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2006] [Revised: 07/07/2006] [Accepted: 07/19/2006] [Indexed: 10/24/2022]
Abstract
Binding studies between progesterone and alpha1-acid glycoprotein allowed us to demonstrate that the binding site of progesterone contains one hydrophobic tryptophan residue and that the structure of the protein is not altered upon binding. The data obtained at saturated concentrations of progesterone clearly reveal the type of interaction at physiological levels.
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Affiliation(s)
- J R Albani
- Laboratoire de Biophysique Moléculaire, Université des Sciences et Technologies de Lille, Bât. C6. 59655 Villeneuve d'Ascq Cédex, France.
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28
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Abstract
Lateral segregation of cell membrane components gives rise to microdomains with a different structure within the membrane. Most prominently, lipid rafts are defined as domains in liquid ordered phase whereas surrounding membranes are more fluid. Here we review a 2-photon fluorescence microscopy approach, which allows the visualization of membrane fluidity. The fluorescent probe Laurdan exhibits a blue shift in emission with increasing membrane condensation caused by an alteration in the dipole moment of the probe as a consequence of exclusion of water molecules from the lipid bilayer. The quantification of membrane order is achieved by the Generalized Polarization (GP) values, which are defined as normalized intensity ratios of two emission channels. GP images are therefore not biased by probe concentrations and membrane ruffles. Furthermore, Laurdan reports membrane structure independently from the lipid and protein cargo of the membrane domains. We give examples where Laurdan microscopy was instrumental in quantifying the formation of condensed membrane domains and their cellular requirements. Moreover we discuss how microdomains identified by Laurdan microscopy are consistent with domains identified by other methodologies and put GP images in the context of current raft hypotheses.
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Affiliation(s)
- Katharina Gaus
- Centre for Vascular Research at the School of Medical Sciences, University of New South Wales and The Department of Haematology, Prince of Wales Hospital, Sydney, Australia.
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29
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He HW, Zhang J, Zhou HM, Yan YB. Conformational change in the C-terminal domain is responsible for the initiation of creatine kinase thermal aggregation. Biophys J 2005; 89:2650-8. [PMID: 16006628 PMCID: PMC1366765 DOI: 10.1529/biophysj.105.066142] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2005] [Accepted: 06/29/2005] [Indexed: 11/18/2022] Open
Abstract
Protein conformational changes may be associated with particular properties such as its function, transportation, assembly, tendency to aggregate, and potential cytotoxicity. In this research, the conformational change that is responsible for the fast destabilization and aggregation of rabbit muscle creatine kinase (EC 2.7.3.2) induced by heat was studied by intrinsic fluorescence and infrared spectroscopy. A pretransitional change of the tryptophan microenvironments was found from the intrinsic fluorescence spectra. A further analysis of the infrared spectra using quantitative second-derivative and two-dimensional correlation analysis indicated that the changes of the beta-sheet structures in the C-terminal domain and the loops occurred before the formation of intermolecular cross-beta-sheet structures and the unfolding of alpha-helices. These results suggested that the pretransitional conformational changes in the active site and the C-terminal domain might result in the modification of the domain-domain interactions and the formation of an inactive dimeric form that was prone to aggregate. Our results highlighted the fact that some minor conformational changes, which were usually negligible or undetectable by normal methods, might play a crucial role in protein stability and aggregation. Our results also suggested that the changes in domain-domain interactions, but not the dissociation of the dimer, might play a crucial role in the thermal denaturation and aggregation of this dimeric two-domain protein.
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Affiliation(s)
- Hua-Wei He
- Department of Biological Sciences and Biotechnology, and State Key Laboratory of Biomembrane and Membrane Biotechnology, Tsinghua University, Beijing, China
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30
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Schlattner U, Gehring F, Vernoux N, Tokarska-Schlattner M, Neumann D, Marcillat O, Vial C, Wallimann T. C-terminal Lysines Determine Phospholipid Interaction of Sarcomeric Mitochondrial Creatine Kinase. J Biol Chem 2004; 279:24334-42. [PMID: 15044463 DOI: 10.1074/jbc.m314158200] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
High affinity interaction between octameric mitochondrial creatine kinase (MtCK) and the phospholipid cardiolipin in the inner mitochondrial membrane plays an important role in metabolite channeling between MtCK and inner membrane adenylate translocator, which itself is tightly bound to cardiolipin. Three C-terminal basic residues revealed as putative cardiolipin anchors in the x-ray structures of MtCK and corresponding to lysines in human sarcomeric MtCK (sMtCK) were exchanged by in vitro mutagenesis (K369A/E, K379Q/A/E, K380Q/A/E) to yield double and triple mutants. sMtCK proteins were bacterially expressed, purified to homogeneity, and verified for structural integrity by enzymatic activity, gel filtration chromatography, and CD spectroscopy. Interaction with cardiolipin and other acidic phospholipids was quantitatively analyzed by light scattering, surface plasmon resonance, and fluorescence spectroscopy. All mutant sMtCKs showed a strong decrease in vesicle cross-linking, membrane affinity, binding capacity, membrane ordering capability, and binding-induced changes in protein structure as compared with wild type. These effects did not depend on the nature of the replacing amino acid but on the number of exchanged lysines. They were moderate for Lys-379/Lys-380 double mutants but pronounced for triple mutants, with a 30-fold lower membrane affinity and an entire lack of alterations in protein structure compared with wild-type sMtCK. However, even triple mutants partially maintained an increased order of cardiolipin-containing membranes. Thus, the three C-terminal lysines determine high affinity sMtCK/cardiolipin interaction and its effects on MtCK structure, whereas low level binding and some effect on membrane fluidity depend on other structural components. These results are discussed in regard to MtCK microcompartments and evolution.
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MESH Headings
- Amino Acid Sequence
- Base Sequence
- Cardiolipins/chemistry
- Cell Membrane/metabolism
- Chromatography, Gel
- Circular Dichroism
- Creatine Kinase/chemistry
- Creatine Kinase, Mitochondrial Form
- Cross-Linking Reagents/pharmacology
- Crystallography, X-Ray
- Humans
- Isoenzymes/chemistry
- Kinetics
- Light
- Liposomes/chemistry
- Lysine/chemistry
- Models, Biological
- Models, Molecular
- Molecular Sequence Data
- Mutagenesis, Site-Directed
- Mutation
- Phospholipids/chemistry
- Plasmids/metabolism
- Protein Binding
- Protein Structure, Tertiary
- Sarcomeres/metabolism
- Scattering, Radiation
- Sequence Homology, Amino Acid
- Spectrometry, Fluorescence
- Spectrophotometry
- Surface Plasmon Resonance
- Time Factors
- Tryptophan/chemistry
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Affiliation(s)
- Uwe Schlattner
- Institute of Cell Biology, Swiss Federal Institute of Technology (ETH) Zürich, Hönggerberg, CH-8093 Zürich, Switzerland.
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Chattopadhyay A. Exploring membrane organization and dynamics by the wavelength-selective fluorescence approach. Chem Phys Lipids 2003; 122:3-17. [PMID: 12598034 DOI: 10.1016/s0009-3084(02)00174-3] [Citation(s) in RCA: 128] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Wavelength-selective fluorescence comprises a set of approaches based on the red edge effect in fluorescence spectroscopy which can be used to directly monitor the environment and dynamics around a fluorophore in a complex biological system. A shift in the wavelength of maximum fluorescence emission toward higher wavelengths, caused by a shift in the excitation wavelength toward the red edge of absorption band, is termed red edge excitation shift (REES). This effect is mostly observed with polar fluorophores in motionally restricted media such as very viscous solutions or condensed phases where the dipolar relaxation time for the solvent shell around a fluorophore is comparable to or longer than its fluorescence lifetime. REES arises from slow rates of solvent relaxation (reorientation) around an excited state fluorophore which is a function of the motional restriction imposed on the solvent molecules in the immediate vicinity of the fluorophore. Utilizing this approach, it becomes possible to probe the mobility parameters of the environment itself (which is represented by the relaxing solvent molecules) using the fluorophore merely as a reporter group. Further, since the ubiquitous solvent for biological systems is water, the information obtained in such cases will come from the otherwise 'optically silent' water molecules. This makes REES and related techniques extremely useful since hydration plays a crucial modulatory role in a large number of important cellular events, including lipid-protein interactions and ion transport. The interfacial region in membranes, characterized by unique motional and dielectric characteristics, represents an appropriate environment for displaying wavelength-selective fluorescence effects. The application of REES and related techniques (wavelength-selective fluorescence approach) as a powerful tool to monitor the organization and dynamics of probes and peptides bound to membranes, micelles, and reverse micelles is discussed.
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De Ceukeleire M, Albani JR. Interaction between carbohydrate residues of alpha(1)-acid glycoprotein (orosomucoid) and progesterone. A fluorescence study. Carbohydr Res 2002; 337:1405-10. [PMID: 12204624 DOI: 10.1016/s0008-6215(02)00165-9] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Interaction between progesterone and the carbohydrate residues of alpha(1)-acid glycoprotein was followed by fluorescence studies using calcofluor white. The fluorophore interacts with polysaccharides and is commonly used in clinical studies. Binding of progesterone to the protein induces a decrease in the fluorescence intensity of calcofluor white, accompanied by a shift to the short wavelengths of its emission maximum. The dissociation constant of the complex was found equal to 8.62 microM. Interaction between progesterone and free calcofluor in solution induces a low decrease in the fluorescence intensity of the fluorophore without any shift of the emission maximum. These results show that in alpha(1)-acid glycoprotein, the binding site of progesterone is very close to the carbohydrate residues. Fluorescence intensity quenching of free calcofluor in solution with cesium ion gives a bimolecular diffusion constant (k(q)) of 2.23 x 10(9) M(-1) s(-1). This value decreases to 0.19 x 10(9) M(-1) s(-1) when calcofluor white is bound to alpha(1)-acid glycoprotein. Binding of progesterone does not modify the value of k(q) of the cesium. Previous studies have shown that the terminal sialic acid residue is mobile, while the other glycannes are rigid [Albani, J. R.; Sillen, A.; Coddeville, B.; Plancke, Y. D.; Engelborghs, Y. Carbohydr. Res. 1999, 322, 87-94]. Red-edge excitation spectra and Perrin plot experiments performed on sialylated and asialylated alpha(1)-acid glycoprotein show that binding of progesterone to alpha(1)-acid glycoprotein does not modify the local dynamics of the carbohydrate residues of the protein.
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Affiliation(s)
- Melanie De Ceukeleire
- Laboratoire de Biophysique Moléculaire, Université des Sciences et Technologies de Lille, Bâtiment C6, 59655 Villeneuve d'Ascq Cédex, France
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Application of the Wavelength-selective Fluorescence Approach to Monitor Membrane Organization and Dynamics. ACTA ACUST UNITED AC 2002. [DOI: 10.1007/978-3-642-56067-5_12] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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Granjon T, Vial C, Buchet R, Vacheron MJ. Mitochondrial creatine kinase binding to liposomes and vesicle aggregation: effect of cleavage by proteinase K. JOURNAL OF PROTEIN CHEMISTRY 2001; 20:593-9. [PMID: 11890199 DOI: 10.1023/a:1013763716762] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Mitochondrial creatine kinase and its proteinase K nicked-derivative interaction with liposomes induced slight secondary structure changes evidenced by infrared spectra. In nondenaturing conditions, the N-terminal (K1) and the C-terminal (K2) fragments remained associated with each other and bound to liposomes. When the two fragments were separated by denaturation, K2 was soluble, whereas most of K1 was adsorbed onto liposomes. The three-dimensional structure of uncleaved mtCK suggests that the C-terminal moiety, which contains positively charged surface residues, interacted with membranes. After denaturation and renaturation of the nicked enzyme, both peptides did not refold properly and did not reassociate with each other. The misfolded K1 fragment bound to the membrane through a stretch of positive residues, which were buried in the native enzyme. The lack of binding of the ill-folded K2 peptide could be related to the disruption of the optimal disposition of its positive charges, responsible for the correct interaction of native mtCK with membrane.
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Affiliation(s)
- T Granjon
- Laboratoire de Biomembranes et Enzymes Associés, Université Claude Bernard Lyon 1, Villeurbanne, France
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