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Adrien V, Reffay M, Taulier N, Verchère A, Monlezun L, Picard M, Ducruix A, Broutin I, Pincet F, Urbach W. Kinetic study of membrane protein interactions: from three to two dimensions. Sci Rep 2024; 14:882. [PMID: 38195620 PMCID: PMC10776792 DOI: 10.1038/s41598-023-50827-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2023] [Accepted: 12/26/2023] [Indexed: 01/11/2024] Open
Abstract
Molecular interactions are contingent upon the system's dimensionality. Notably, comprehending the impact of dimensionality on protein-protein interactions holds paramount importance in foreseeing protein behaviour across diverse scenarios, encompassing both solution and membrane environments. Here, we unravel interactions among membrane proteins across various dimensionalities by quantifying their binding rates through fluorescence recovery experiments. Our findings are presented through the examination of two protein systems: streptavidin-biotin and a protein complex constituting a bacterial efflux pump. We present here an original approach for gauging a two-dimensional binding constant between membrane proteins embedded in two opposite membranes. The quotient of protein binding rates in solution and on the membrane represents a metric denoting the exploration distance of the interacting sites-a novel interpretation.
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Affiliation(s)
- Vladimir Adrien
- Laboratoire de Physique de l'École normale superieure, École Normale Supérieure, Université Paris Sciences et Lettres, CNRS, Sorbonne Université, Université Paris Cité, F-75005, Paris, France.
- Department of Infectious Diseases, Avicenne Hospital, AP-HP, Université Sorbonne Paris Nord, Bobigny, France.
- Université Paris Cité, Inserm UMR-S 1266, Institute of Psychiatry and Neuroscience of Paris (IPNP), Paris, France.
| | - Myriam Reffay
- Laboratoire Matière et Systèmes Complexes, UMR 7057, CNRS and Université de Paris Cité, 75205, Paris Cedex 13, France
| | - Nicolas Taulier
- Sorbonne Université, CNRS, INSERM, Laboratoire d'Imagerie Biomédicale-LIB, 75006, Paris, France
| | - Alice Verchère
- Laboratoire CiTCoM, Faculté de Santé, Université Paris Cité, CNRS, 75006, Paris, France
| | - Laura Monlezun
- Université Paris Cité, CNRS, Expression Génétique Microbienne, Institut de Biologie Physico-Chimique, Paris, France
| | - Martin Picard
- Université Paris Cité, Laboratoire de Biologie Physico-Chimique des Protéines Membranaires CNRS UMR7099, 75005, Paris, France
- Institut de Biologie Physico-Chimique, Fondation Edmond de Rothschild, 75005, Paris, France
| | - Arnaud Ducruix
- Laboratoire CiTCoM, Faculté de Santé, Université Paris Cité, CNRS, 75006, Paris, France
| | - Isabelle Broutin
- Laboratoire CiTCoM, Faculté de Santé, Université Paris Cité, CNRS, 75006, Paris, France
| | - Frédéric Pincet
- Laboratoire de Physique de l'École normale superieure, École Normale Supérieure, Université Paris Sciences et Lettres, CNRS, Sorbonne Université, Université Paris Cité, F-75005, Paris, France.
| | - Wladimir Urbach
- Laboratoire de Physique de l'École normale superieure, École Normale Supérieure, Université Paris Sciences et Lettres, CNRS, Sorbonne Université, Université Paris Cité, F-75005, Paris, France.
- Sorbonne Université, CNRS, INSERM, Laboratoire d'Imagerie Biomédicale-LIB, 75006, Paris, France.
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Crespo EA, Vega LF, Pérez-Sánchez G, Coutinho JAP. Unveiling the phase behavior of C iE j non-ionic surfactants in water through coarse-grained molecular dynamics simulations. Soft Matter 2021; 17:5183-5196. [PMID: 33942825 DOI: 10.1039/d1sm00362c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Poly(oxyethylene) alkyl ethers, usually denoted by CiEj surfactants, exhibit a rich phase behavior in water, self-assembling to form a variety of 3-D structures with a controllable morphology that find multiple applications across different industrial segments. Hence, being able to describe and understand the effect of molecular structure on the phase behavior of these systems is highly relevant for the efficient design of new materials and their applications. Considering the promising results obtained over the last decade using the MARTINI model to describe ethylene-oxide containing compounds, an extensive assessment of the ability of such a model to describe the phase behavior of CiEj in water was carried out and results are presented here. Given the overall poor temperature transferability of the MARTINI model, mostly due to the lack of an accurate representation of hydrogen bonding, simulations were carried out at a single temperature of 333 K, where most phases are expected to occur according to experiments. Different chain lengths of both the hydrophobic and hydrophilic moieties, spanning a wide range of hydrophilic-lipophilic balance values, were investigated and the phase diagrams of various CiEj surfactants explored over a wide concentration range. The model was able to satisfactorily describe the effect of surfactant structure and concentration on mesophase formation. The stability and dimensions of the obtained phases, and the prediction of some unique features such as the characterization of a singular lamellar phase are presented. The results obtained in this work highlight both the predictive ability and the transferability of the MARTINI forcefield in the description of such systems. Moreover, the model was shown to provide adequate descriptions of the micellar phase in terms of micelle dimensions, critical micelle concentration, and average aggregation number.
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Affiliation(s)
- Emanuel A Crespo
- CICECO - Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, 3810-1933, Aveiro, Portugal.
| | - Lourdes F Vega
- Chemical Engineering Department and Research and Innovation Center on CO2 and H2 (RICH Center), Khalifa University of Science and Technology, P. O. Box 127788, Abu Dhabi, United Arab Emirates
| | - Germán Pérez-Sánchez
- CICECO - Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, 3810-1933, Aveiro, Portugal.
| | - João A P Coutinho
- CICECO - Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, 3810-1933, Aveiro, Portugal.
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Bhattacharya A, Niederholtmeyer H, Podolsky KA, Bhattacharya R, Song JJ, Brea RJ, Tsai CH, Sinha SK, Devaraj NK. Lipid sponge droplets as programmable synthetic organelles. Proc Natl Acad Sci U S A 2020; 117:18206-18215. [PMID: 32694212 PMCID: PMC7414067 DOI: 10.1073/pnas.2004408117] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
Living cells segregate molecules and reactions in various subcellular compartments known as organelles. Spatial organization is likely essential for expanding the biochemical functions of synthetic reaction systems, including artificial cells. Many studies have attempted to mimic organelle functions using lamellar membrane-bound vesicles. However, vesicles typically suffer from highly limited transport across the membranes and an inability to mimic the dense membrane networks typically found in organelles such as the endoplasmic reticulum. Here, we describe programmable synthetic organelles based on highly stable nonlamellar sponge phase droplets that spontaneously assemble from a single-chain galactolipid and nonionic detergents. Due to their nanoporous structure, lipid sponge droplets readily exchange materials with the surrounding environment. In addition, the sponge phase contains a dense network of lipid bilayers and nanometric aqueous channels, which allows different classes of molecules to partition based on their size, polarity, and specific binding motifs. The sequestration of biologically relevant macromolecules can be programmed by the addition of suitably functionalized amphiphiles to the droplets. We demonstrate that droplets can harbor functional soluble and transmembrane proteins, allowing for the colocalization and concentration of enzymes and substrates to enhance reaction rates. Droplets protect bound proteins from proteases, and these interactions can be engineered to be reversible and optically controlled. Our results show that lipid sponge droplets permit the facile integration of membrane-rich environments and self-assembling spatial organization with biochemical reaction systems.
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Affiliation(s)
- Ahanjit Bhattacharya
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, CA 92093
| | - Henrike Niederholtmeyer
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, CA 92093
| | - Kira A Podolsky
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, CA 92093
| | - Rupak Bhattacharya
- Department of Physics, University of California San Diego, La Jolla, CA 92093
| | - Jing-Jin Song
- Department of Physics, University of California San Diego, La Jolla, CA 92093
| | - Roberto J Brea
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, CA 92093
| | - Chu-Hsien Tsai
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, CA 92093
| | - Sunil K Sinha
- Department of Physics, University of California San Diego, La Jolla, CA 92093
| | - Neal K Devaraj
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, CA 92093;
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Ostuni MA, Hermand P, Saindoy E, Guillou N, Guellec J, Coens A, Hattab C, Desuzinges-Mandon E, Jawhari A, Iatmanen-Harbi S, Lequin O, Fuchs P, Lacapere JJ, Combadière C, Pincet F, Deterre P. CX3CL1 homo-oligomerization drives cell-to-cell adherence. Sci Rep 2020; 10:9069. [PMID: 32494000 DOI: 10.1038/s41598-020-65988-w] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Accepted: 05/04/2020] [Indexed: 12/23/2022] Open
Abstract
During inflammatory response, blood leukocytes adhere to the endothelium. This process involves numerous adhesion molecules, including a transmembrane chemokine, CX3CL1, which behaves as a molecular cluster. How this cluster assembles and whether this association has a functional role remain unknown. The analysis of CX3CL1 clusters using native electrophoresis and single molecule fluorescence kinetics shows that CX3CL1 is a homo-oligomer of 3 to 7 monomers. Fluorescence recovery after photobleaching assays reveal that the CX3CL1-transmembrane domain peptide self-associates in both cellular and acellular lipid environments, while its random counterpart (i.e. peptide with the same residues in a different order) does not. This strongly indicates that CX3CL1 oligomerization is driven by its intrinsic properties. According to the molecular modeling, CX3CL1 does not associate in compact bundles but rather with monomers linearly assembled side by side. Finally, the CX3CL1 transmembrane peptide inhibits both the CX3CL1 oligomerization and the adhesive function, while its random counterpart does not. This demonstrates that CX3CL1 oligomerization is mandatory for its adhesive potency. Our results provide a new direction to control CX3CL1-dependent cellular adherence in key immune processes.
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