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Hashimoto S, Matsuo K. Dynamic Observation of the Membrane Interaction Processes of β-Lactoglobulin by Time-Resolved Vacuum-Ultraviolet Circular Dichroism. Anal Chem 2024; 96:10524-10533. [PMID: 38907695 DOI: 10.1021/acs.analchem.4c00556] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/24/2024]
Abstract
The elucidation of protein-membrane interactions is pivotal for comprehending the mechanisms underlying diverse biological phenomena and membrane-related diseases. In this investigation, vacuum-ultraviolet circular dichroism (VUVCD) spectroscopy, utilizing synchrotron radiation (SR), was employed to dynamically observe membrane interaction processes involving water-soluble proteins at the secondary-structure level. The study utilized a time-resolved (TR) T-shaped microfluidic cell, facilitating the rapid and efficient mixing of protein and membrane solutions. This system was instrumental in acquiring measurements of the time-resolved circular dichroism (TRCD) spectra of β-lactoglobulin (bLG) during its interaction with lysoDMPG micelles. The results indicate that bLG undergoes a β-α conformation change, leading to the formation of the membrane-interacting state (M-state), with structural alterations occurring in more than two steps. Global fitting analysis, employing biexponential functions with all of the TRCD spectral data sets, yielded two distinct rate constants (0.18 ± 0.01 and 0.06 ± 0.003/s) and revealed a unique spectrum corresponding to an intermediate state (I-state). Secondary-structure analysis of bLG in its native (N-, I-, and M-states) highlighted that structural changes from the N- to I-states predominantly occurred in the N- and C-terminal regions, which were prominently exposed to the membrane. Meanwhile, transitions from the I- to M-states extended into the inner barrel regions of bLG. Further examination of the physical properties of α-helical segments, such as effective charge and hydrophobicity, revealed that the N- to I- and I- to M-state transitions, which are ascribed to first- and second-rate constants, respectively, are primarily driven by electrostatic and hydrophobic interactions, respectively. These findings underscore the capability of the TR-VUVCD system as a robust tool for characterizing protein-membrane interactions at the molecular level.
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Affiliation(s)
- Satoshi Hashimoto
- Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8526, Japan
| | - Koichi Matsuo
- Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8526, Japan
- Research Institute for Synchrotron Radiation Science, Hiroshima University, 2-313 Kagamiyama, Higashi-Hiroshima 739-0046, Japan
- International Institute for Sustainability with Knotted Chiral Meta Matter (WPI-SKCM2), Hiroshima University, 2-313 Kagamiyama, Higashi-Hiroshima 739-0046, Japan
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2
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Anselmo S, Sancataldo G, Foderà V, Vetri V. α-casein micelles-membranes interaction: Flower-like lipid protein coaggregates formation. Biochim Biophys Acta Gen Subj 2022; 1866:130196. [PMID: 35724888 DOI: 10.1016/j.bbagen.2022.130196] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2022] [Revised: 04/28/2022] [Accepted: 06/13/2022] [Indexed: 11/28/2022]
Abstract
BACKGROUND Environmental conditions regulate the association/aggregation states of proteins and their action in cellular compartments. Analysing protein behaviour in presence of lipid membranes is fundamental for the comprehension of many functional and dysfunctional processes. Here, we present an experimental study on the interaction between model membranes and α-casein. α-casein is the major component of milk proteins and it is recognised to play a key role in performing biological functions. The conformational properties of this protein and its capability to form supramolecular structures, like micelles or irreversible aggregates, are key effectors in functional and pathological effects. METHODS By means of quantitative fluorescence imaging and complementary spectroscopic methods, we were able to characterise α-casein association state and the course of events induced by pH changes, which regulate the interaction of this molecule with membranes. RESULTS The study of these complex dynamic events revealed that the initial conformation of the protein critically regulates the fate of α-casein, size and structure of the newly formed aggregates and their effect on membrane structures. Disassembly of micelles due to modification in electrostatic interactions results in increased membrane structure rigidity which accompanies the formation of protein lipid flower-like co-aggregates with protein molecules localised in the external part. GENERAL SIGNIFICANCE These results may contribute to the comprehension of how the initial state of a protein establishes the course of events that occur upon changes in the molecular environment. These events which may occur in cells may be essential to functional, pathological or therapeutical properties specifically associated to casein proteins.
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Affiliation(s)
- Sara Anselmo
- Dipartimento di Fisica e Chimica - Emilio Segré, Università degli Studi di Palermo, Viale delle Scienze ed. 18, 90128 Palermo, Italy
| | - Giuseppe Sancataldo
- Dipartimento di Fisica e Chimica - Emilio Segré, Università degli Studi di Palermo, Viale delle Scienze ed. 18, 90128 Palermo, Italy
| | - Vito Foderà
- Department of Pharmacy, University of Copenhagen, Universitetsparken 2, 2100 Copenhagen, Denmark
| | - Valeria Vetri
- Dipartimento di Fisica e Chimica - Emilio Segré, Università degli Studi di Palermo, Viale delle Scienze ed. 18, 90128 Palermo, Italy.
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3
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Matsuo K, Gekko K. Circular-Dichroism and Synchrotron-Radiation Circular-Dichroism Spectroscopy as Tools to Monitor Protein Structure in a Lipid Environment. Methods Mol Biol 2020; 2003:253-279. [PMID: 31218622 DOI: 10.1007/978-1-4939-9512-7_12] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/31/2023]
Abstract
Circular-dichroism (CD) spectroscopy is a powerful tool for the secondary-structure analysis of proteins. The structural information obtained by CD does not have atomic-level resolution (unlike X-ray crystallography and NMR spectroscopy), but it has the great advantage of being applicable to both nonnative and native proteins in a wide range of solution conditions containing lipids and detergents. The development of synchrotron-radiation CD (SRCD) instruments has greatly expanded the utility of this method by extending the spectra to the vacuum-ultraviolet region below 190 nm and producing information that is unobtainable by conventional CD instruments. Combining SRCD data with bioinformatics provides new insight into the conformational changes of proteins in a membrane environment.
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Affiliation(s)
- Koichi Matsuo
- Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashi-Hiroshima, Japan
| | - Kunihiko Gekko
- Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashi-Hiroshima, Japan.
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4
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Matsuo K, Kumashiro M, Gekko K. Characterization of the mechanism of interaction between α1‐acid glycoprotein and lipid membranes by vacuum‐ultraviolet circular‐dichroism spectroscopy. Chirality 2020; 32:594-604. [DOI: 10.1002/chir.23208] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2019] [Revised: 01/27/2020] [Accepted: 02/17/2020] [Indexed: 12/11/2022]
Affiliation(s)
- Koichi Matsuo
- Hiroshima Synchrotron Radiation CenterHiroshima University Higashi‐Hiroshima Japan
| | - Munehiro Kumashiro
- Department of Physical Science, Graduate School of ScienceHiroshima University Higashi‐Hiroshima Japan
| | - Kunihiko Gekko
- Hiroshima Synchrotron Radiation CenterHiroshima University Higashi‐Hiroshima Japan
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5
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Kanwa N, De SK, Maity A, Chakraborty A. Interaction of aliphatic amino acids with zwitterionic and charged lipid membranes: hydration and dehydration phenomena. Phys Chem Chem Phys 2020; 22:3234-3244. [DOI: 10.1039/c9cp06188f] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Aliphatic amino acids interact differently in order to induce gelation or fluidization in zwitterionic and charged lipid membranes as a result of hydration or dehydration of the membrane surface.
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Affiliation(s)
- Nishu Kanwa
- Discipline of Chemistry
- Indian Institute of Technology Indore
- Indore
- India
| | - Soumya Kanti De
- Discipline of Chemistry
- Indian Institute of Technology Indore
- Indore
- India
| | - Avijit Maity
- Discipline of Chemistry
- Indian Institute of Technology Indore
- Indore
- India
| | - Anjan Chakraborty
- Discipline of Chemistry
- Indian Institute of Technology Indore
- Indore
- India
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6
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Oehlke K, Keppler JK, Milsmann J, Mayer-Miebach E, Greiner R, Steffen-Heins A. Adsorption of β-lactoglobulin to solid lipid nanoparticles (SLN) depends on encapsulated compounds. J FOOD ENG 2019. [DOI: 10.1016/j.jfoodeng.2018.12.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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7
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Rao E, Foderà V, Leone M, Vetri V. Direct observation of alpha-lactalbumin, adsorption and incorporation into lipid membrane and formation of lipid/protein hybrid structures. Biochim Biophys Acta Gen Subj 2019; 1863:784-794. [PMID: 30742952 DOI: 10.1016/j.bbagen.2019.02.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2018] [Revised: 02/06/2019] [Accepted: 02/07/2019] [Indexed: 02/02/2023]
Abstract
The interaction between proteins and membranes is of great interest in biomedical and biotechnological research for its implication in many functional and dysfunctional processes. We present an experimental study on the interaction between model membranes and alpha-lactalbumin (α-La). α-La is widely studied for both its biological function and its anti-tumoral properties. We use advanced fluorescence microscopy and spectroscopy techniques to characterize α-La-membrane mechanisms of interaction and α-La-induced modifications of membranes when insertion of partially disordered regions of protein chains in the lipid bilayer is favored. Moreover, using fluorescence lifetime imaging, we are able to distinguish between protein adsorption and insertion in the membranes. Our results indicate that, upon addition of α-La to giant vesicles samples, protein is inserted into the lipid bilayer with rates that are concentration-dependent. The formation of heterogeneous hybrid protein-lipid co-aggregates, paralleled with protein conformational and structural changes, alters the membrane structure and morphology, leading to an increase in membrane fluidity.
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Affiliation(s)
- Estella Rao
- Dipartimento di Fisica e Chimica, Università di Palermo, 90128 Palermo, Italy
| | - Vito Foderà
- Department of Pharmacy, Universitetsparken 2, University of Copenhagen, 2100 Copenhagen, Denmark
| | - Maurizio Leone
- Dipartimento di Fisica e Chimica, Università di Palermo, 90128 Palermo, Italy
| | - Valeria Vetri
- Dipartimento di Fisica e Chimica, Università di Palermo, 90128 Palermo, Italy.
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8
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Conformational changes, from β-strand to α-helix, of the fatty acid-binding protein ReP1-NCXSQ in anionic lipid membranes: dependence with the vesicle curvature. EUROPEAN BIOPHYSICS JOURNAL: EBJ 2017; 47:165-177. [DOI: 10.1007/s00249-017-1243-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2017] [Revised: 05/31/2017] [Accepted: 07/10/2017] [Indexed: 10/19/2022]
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9
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Engineering a Novel Porin OmpGF Via Strand Replacement from Computational Analysis of Sequence Motif. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2017; 1859:1180-1189. [PMID: 28341438 DOI: 10.1016/j.bbamem.2017.03.012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2016] [Revised: 02/20/2017] [Accepted: 03/18/2017] [Indexed: 12/12/2022]
Abstract
β-Barrelmembrane proteins (βMPs) form barrel-shaped pores in the outer membrane of Gram-negative bacteria, mitochondria, and chloroplasts. Because of the robustness of their barrel structures, βMPs have great potential as nanosensors for single-molecule detection. However, natural βMPs currently employed have inflexible biophysical properties and are limited in their pore geometry, hindering their applications in sensing molecules of different sizes and properties. Computational engineering has the promise to generate βMPs with desired properties. Here we report a method for engineering novel βMPs based on the discovery of sequence motifs that predominantly interact with the cell membrane and appear in more than 75% of transmembrane strands. By replacing β1-β6 strands of the protein OmpF that lack these motifs with β1-β6 strands of OmpG enriched with these motifs and computational verification of increased stability of its transmembrane section, we engineered a novel βMP called OmpGF. OmpGF is predicted to form a monomer with a stable transmembrane region. Experimental validations showed that OmpGF could refold in vitro with a predominant β-sheet structure, as confirmed by circular dichroism. Evidence of OmpGF membrane insertion was provided by intrinsic tryptophan fluorescence spectroscopy, and its pore-forming property was determined by a dye-leakage assay. Furthermore, single-channel conductance measurements confirmed that OmpGF function as a monomer and exhibits increased conductance than OmpG and OmpF. These results demonstrated that a novel and functional βMP can be successfully engineered through strand replacement based on sequence motif analysis and stability calculation.
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10
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Zhu W, Silvers R, Schwalbe H, Keiderling TA. Reduced and mutant lysozyme refolding with lipid vesicles. Model study of disulfide impact on equilibria and dynamics. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2016; 1864:1083-1092. [PMID: 27240304 DOI: 10.1016/j.bbapap.2016.05.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2016] [Revised: 05/24/2016] [Accepted: 05/25/2016] [Indexed: 11/26/2022]
Abstract
The recovery of secondary structure in disordered, disulfide-reduced hen egg white lysozyme (HEWL) upon interaction with lipid vesicles was studied using circular dichroism (CD), fluorescence and infrared (IR) spectroscopic techniques. Lipid vesicles having negative head groups, such as DMPG, interact with reduced HEWL to induce formation of more helical structure than in native HEWL, but no stable tertiary structure was evident. Changes in tertiary structure, as evidenced by local environment of the tryptophan residues, were monitored by fluorescence. Spectra for oxidized HEWL, reduced HEWL and mutants with no or just one disulfide bond developed variable degrees of increased helicity when added to negatively charged lipid vesicles, mostly depending on packing of tails. When mixed with zwitterionic lipid vesicles, reduced HEWL developed β-sheet structure with no change in helicity, indicating an altered interaction mechanism. Stopped flow CD and fluorescence dynamics, were fit to multi-exponential forms, consistent with refolding to metastable intermediates of increasing helicity for HEWL interacting with lipid vesicles. Formation of an intermediate after rapid interaction of the lipid vesicles and the protein is supported by the correlation of faster steps in CD and fluorescence kinetics, and largely appears driven by electrostatic interaction. In subsequent slower steps, the partially refolded intermediate further alters structure, gaining helicity and modifying tryptophan packing, as driven by hydrophobic interactions.
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Affiliation(s)
- Weiying Zhu
- Department of Chemistry, University of Illinois at Chicago, 845 W. Taylor St., m/c 111, Chicago, IL 60607-7061, USA
| | - Robert Silvers
- Institute for Organic Chemistry and Chemical Biology, Center for Biomolecular Magnetic Resonance (BMRZ), Johann Wolfgang Goethe-University Frankfurt,, Max-von-Laue-Str. 7, 60438 Frankfurt/Main, Germany
| | - Harald Schwalbe
- Institute for Organic Chemistry and Chemical Biology, Center for Biomolecular Magnetic Resonance (BMRZ), Johann Wolfgang Goethe-University Frankfurt,, Max-von-Laue-Str. 7, 60438 Frankfurt/Main, Germany
| | - Timothy A Keiderling
- Department of Chemistry, University of Illinois at Chicago, 845 W. Taylor St., m/c 111, Chicago, IL 60607-7061, USA.
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11
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Matsuo K, Maki Y, Namatame H, Taniguchi M, Gekko K. Conformation of membrane-bound proteins revealed by vacuum-ultraviolet circular-dichroism and linear-dichroism spectroscopy. Proteins 2016; 84:349-59. [PMID: 26756612 DOI: 10.1002/prot.24981] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2015] [Revised: 12/09/2015] [Accepted: 12/19/2015] [Indexed: 12/16/2022]
Abstract
Knowledge of the conformations of a water-soluble protein bound to a membrane is important for understanding the membrane-interaction mechanisms and the membrane-mediated functions of the protein. In this study we applied vacuum-ultraviolet circular-dichroism (VUVCD) and linear-dichroism (LD) spectroscopy to analyze the conformations of α-lactalbumin (LA), thioredoxin (Trx), and β-lactoglobulin (LG) bound to phosphatidylglycerol liposomes. The VUVCD analysis coupled with a neural-network analysis showed that these three proteins have characteristic helix-rich conformations involving several helical segments, of which two amphiphilic or hydrophobic segments take part in interactions with the liposome. The LD analysis predicted the average orientations of these helix segments on the liposome: two amphiphilic helices parallel to the liposome surface for LA, two hydrophobic helices perpendicular to the liposome surface for Trx, and a hydrophobic helix perpendicular to and an amphiphilic helix parallel to the liposome surface for LG. This sequence-level information about the secondary structures and orientations was used to formulate interaction models of the three proteins at the membrane surface. This study demonstrates the validity of a combination of VUVCD and LD spectroscopy in conformational analyses of membrane-binding proteins, which are difficult targets for X-ray crystallography and nuclear magnetic resonance spectroscopy.
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Affiliation(s)
- Koichi Matsuo
- Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashi-Hiroshima, 739-0046, Japan
| | - Yasuyuki Maki
- Division of Molecular Science, Graduate School of Science and Technology, Gunma University, Kiryu, 376-8515, Japan
| | - Hirofumi Namatame
- Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashi-Hiroshima, 739-0046, Japan
| | - Masaki Taniguchi
- Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashi-Hiroshima, 739-0046, Japan.,Department of Physical Science, Graduate School of Science, Hiroshima University, Higashi-Hiroshima, 739-8526, Japan
| | - Kunihiko Gekko
- Institute for Sustainable Sciences and Development, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
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12
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Soranzo T, Cortès S, Gilde F, Kreir M, Picart C, Lenormand JL. Functional characterization of p7 viroporin from hepatitis C virus produced in a cell-free expression system. Protein Expr Purif 2015; 118:83-91. [PMID: 26477501 DOI: 10.1016/j.pep.2015.10.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2015] [Revised: 09/21/2015] [Accepted: 10/09/2015] [Indexed: 01/05/2023]
Abstract
Using a cell-free expression system we produced the p7 viroporin embedded into a lipid bilayer in a single-step manner. The protein quality was assessed using different methods. We examined the channel forming activity of p7 and verified its inhibition by 5-(N,N-Hexamethylene) amiloride (HMA). Fourier transformed infrared spectroscopy (FTIR) experiments further showed that when p7 was inserted into synthetic liposomes, the protein displayed a native-like conformation similar to p7 obtained from other sources. Photoactivable amino acid analogs used for p7 protein synthesis enabled oligomerization state analysis in liposomes by cross-linking. Therefore, these findings emphasize the quality of the cell-free produced p7 proteoliposomes which can benefit the field of the hepatitis C virus (HCV) protein production and characterization and also provide tools for the development of new inhibitors to reinforce our therapeutic arsenal against HCV.
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Affiliation(s)
- Thomas Soranzo
- Synthelis SAS, 5 avenue du Grand Sablon, 38700, La Tronche, France; TheREx Laboratory, TIMC-IMAG, UMR 5525, CNRS /UJF, University Joseph Fourier, UFR de Médecine, 38706, La Tronche, France
| | - Sandra Cortès
- Synthelis SAS, 5 avenue du Grand Sablon, 38700, La Tronche, France
| | - Flora Gilde
- CNRS, UMR 5628 (LMGP), 3 parvis Louis Néel, 38016, Grenoble, France; University of Grenoble Alpes, Grenoble Institute of Technology, 38016, Grenoble, France
| | - Mohamed Kreir
- Nanion Technologies GmbH, Gabrielenstraβe 9, 80636, Munich, Germany
| | - Catherine Picart
- CNRS, UMR 5628 (LMGP), 3 parvis Louis Néel, 38016, Grenoble, France; University of Grenoble Alpes, Grenoble Institute of Technology, 38016, Grenoble, France
| | - Jean-Luc Lenormand
- TheREx Laboratory, TIMC-IMAG, UMR 5525, CNRS /UJF, University Joseph Fourier, UFR de Médecine, 38706, La Tronche, France.
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13
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Fang B, Wang T, Chen X, Jin T, Zhang R, Zhuang W. Modeling Vibrational Spectra of Ester Carbonyl Stretch in Water and DMSO Based on Molecular Dynamics Simulation. J Phys Chem B 2015; 119:12390-6. [PMID: 26335032 DOI: 10.1021/acs.jpcb.5b06541] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
On the basis of molecular dynamics simulation, we model the ester carbonyl stretch FTIR signals of methyl acetate in D2O and DMSO. An ab initio map is constructed at the B3LYP/6-311++G** level to relate the carbonyl stretch frequency to the external electric field. Using this map, fluctuating Hamiltonian of the carbonyl stretch is constructed from the MD simulation trajectory. The IR spectra calculated based on this Hamiltonian are found to be in good agreement with the experiment. For methyl acetate in D2O, hydrogen bonding on alkoxy oxygen causes a blue shift of frequency, while that on carbonyl oxygen causes a red shift. Two peaks observed in FTIR signals originate from the balance of these two effects. Furthermore, in both D2O and DMSO solutions, correlations are found between the instantaneous electric field on C═O and the frequencies. Broader line width of the signal in D2O suggests a more inhomogeneous electric field distribution due to the complicated hydrogen-bonding environment.
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Affiliation(s)
- Bin Fang
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences , 457 Zhongshan Road, Dalian 116023, Liaoning, China
| | - Tianjun Wang
- Department of Chemistry, ShanghaiTech University , 19 Yueyang Road, Shanghai 200031, China
| | - Xian Chen
- Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), Department of Physics, Jilin University , 2699 Qianjin Street, ChangChun 130012, China
| | - Tan Jin
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences , 457 Zhongshan Road, Dalian 116023, Liaoning, China
| | - Ruiting Zhang
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences , 457 Zhongshan Road, Dalian 116023, Liaoning, China
| | - Wei Zhuang
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences , 457 Zhongshan Road, Dalian 116023, Liaoning, China
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14
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Gortzi O, Rovoli M, Lalas S, Kontopidis G. Development and Evaluation of a Phospholipid-sterol-protein Membrane Resembling System. FOOD BIOPHYS 2015. [DOI: 10.1007/s11483-015-9390-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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15
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Zhang G, Keiderling TA. Equilibrium and dynamic spectroscopic studies of the interaction of monomeric β-lactoglobulin with lipid vesicles at low pH. Biochemistry 2014; 53:3079-87. [PMID: 24773452 DOI: 10.1021/bi500027x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
β-Lactoglobulin (βLG) is a member of the lipocalin protein family that changes structure upon interacting with anionic surfactants and lipid vesicles under higher-pH conditions at which βLG is dimeric. In this study, a β-sheet to α-helix transformation was also observed for monomeric βLG obtained at pH 2.6 when it was mixed with small unilamellar vesicles (SUVs) of zwitterionic lipids, but being mixed with anionic lipids produced little change. The dynamics and extent of this change were quite dependent on the lipid character, phase, and vesicle size. With 1,2-distearoyl-sn-glycero-3-phosphocholine (DSPC), at ~50 °C and pH 2.6, the βLG converted to a substantially helical form upon addition of ~10 mM lipid in a two-step kinetic process having time constants of ~1 and ~25 h, as monitored by circular dichroism (CD). Fluorescence changes were simpler but implied a rapid initial change in the Trp environments followed by a slower process paralleling the change in secondary structure. Polarization attenuated total reflectance Fourier transform infrared results indicate the formed helices are at least partially inserted into the lipid bilayer and the sheet segments are on the surface. Thermal behavior showed that the secondary structure of the lipid-bound βLG had two phases, the first being characteristic of the protein-lipid vesicle interaction and the second following the DSPC phase change after which the protein apparently dissociated from the vesicle. Large unilamellar vesicles had a weaker interaction, as judged by CD, which may correlate to the partial exposure of the hydrophobic parts of the SUV bilayer. Other zwitterionic lipids bound βLG with much slower kinetics and often required sonication to induce interaction, but these also showed dissociation upon lipid phase change. These thermal and kinetic behaviors suggest a mechanism for the interaction of monomeric βLG with zwitterionic lipids different from that seen previously for the dimeric form.
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Affiliation(s)
- Ge Zhang
- Department of Chemistry, University of Illinois at Chicago , 845 West Taylor Street (m/c 111), Chicago, Illinois 60607-7061, United States
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16
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Das A, Thakur R, Dagar A, Chakraborty A. A spectroscopic investigation and molecular docking study on the interaction of hen egg white lysozyme with liposomes of saturated and unsaturated phosphocholines probed by an anticancer drug ellipticine. Phys Chem Chem Phys 2014; 16:5368-81. [DOI: 10.1039/c3cp54247e] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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17
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Luo J, Wang ZW, Wang F, Zhang H, Lu J, Guo HY, Ren FZ. Cryo-SEM images of native milk fat globule indicate small casein micelles are constituents of the membrane. RSC Adv 2014. [DOI: 10.1039/c4ra06171c] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Schematic representation of the native milk fat globule membrane: casein micelles and whey proteins on the surface of the membrane.
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Affiliation(s)
- Jie Luo
- Key Laboratory of Functional Dairy
- College of Food Science and Nutritional Engineering
- China Agricultural University
- Beijing 100083, China
| | - Zi Wei Wang
- Key Laboratory of Functional Dairy
- College of Food Science and Nutritional Engineering
- China Agricultural University
- Beijing 100083, China
| | - Fang Wang
- Key Laboratory of Functional Dairy
- College of Food Science and Nutritional Engineering
- China Agricultural University
- Beijing 100083, China
| | - Hao Zhang
- Key Laboratory of Functional Dairy
- College of Food Science and Nutritional Engineering
- China Agricultural University
- Beijing 100083, China
| | - Jiang Lu
- Key Laboratory of Functional Dairy
- College of Food Science and Nutritional Engineering
- China Agricultural University
- Beijing 100083, China
| | - Hui Yuan Guo
- Key Laboratory of Functional Dairy
- College of Food Science and Nutritional Engineering
- China Agricultural University
- Beijing 100083, China
| | - Fa Zheng Ren
- Key Laboratory of Functional Dairy
- College of Food Science and Nutritional Engineering
- China Agricultural University
- Beijing 100083, China
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Circular-dichroism and synchrotron-radiation circular-dichroism spectroscopy as tools to monitor protein structure in a lipid environment. Methods Mol Biol 2013; 974:151-76. [PMID: 23404276 DOI: 10.1007/978-1-62703-275-9_8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/27/2023]
Abstract
Circular-dichroism (CD) spectroscopy is a powerful tool for the secondary-structure analysis of proteins. The structural information obtained by CD does not have atomic-level resolution (unlike X-ray crystallography and NMR spectroscopy), but it has the great advantage of being applicable to both nonnative and native proteins in a wide range of solution conditions containing lipids and detergents. The development of synchrotron-radiation CD (SRCD) instruments has greatly expanded the utility of this method by extending the spectra to the vacuum-ultraviolet region below 190 nm and producing information that is unobtainable by conventional CD instruments. Combining SRCD data with bioinformatics provides new insight into the conformational changes of proteins in a membrane environment.
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19
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Bustad HJ, Skjaerven L, Ying M, Halskau Ø, Baumann A, Rodriguez-Larrea D, Costas M, Underhaug J, Sanchez-Ruiz JM, Martinez A. The peripheral binding of 14-3-3γ to membranes involves isoform-specific histidine residues. PLoS One 2012. [PMID: 23189152 PMCID: PMC3506662 DOI: 10.1371/journal.pone.0049671] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Mammalian 14-3-3 protein scaffolds include seven conserved isoforms that bind numerous phosphorylated protein partners and regulate many cellular processes. Some 14-3-3-isoforms, notably γ, have elevated affinity for membranes, which might contribute to modulate the subcellular localization of the partners and substantiate the importance of investigating molecular mechanisms of membrane interaction. By applying surface plasmon resonance we here show that the binding to phospholipid bilayers is stimulated when 14-3-3γ is complexed with its partner, a peptide corresponding to the Ser19-phosphorylated N-terminal region of tyrosine hydroxylase. Moreover, membrane interaction is dependent on salts of kosmotropic ions, which also stabilize 14-3-3γ. Electrostatic analysis of available crystal structures of γ and of the non-membrane-binding ζ-isoform, complemented with molecular dynamics simulations, indicate that the electrostatic potential distribution of phosphopeptide-bound 14-3-3γ is optimal for interaction with the membrane through amphipathic helices at the N-terminal dimerization region. In addition, His158, and especially His195, both specific to 14-3-3γ and located at the convex lateral side, appeared to be pivotal for the ligand induced membrane interaction, as corroborated by site-directed mutagenesis. The participation of these histidine residues might be associated to their increased protonation upon membrane binding. Overall, these results reveal membrane-targeting motifs and give insights on mechanisms that furnish the 14-3-3γ scaffold with the capacity for tuned shuffling from soluble to membrane-bound states.
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Affiliation(s)
| | - Lars Skjaerven
- Department of Biomedicine, University of Bergen, Bergen, Norway
| | - Ming Ying
- Department of Biomedicine, University of Bergen, Bergen, Norway
| | - Øyvind Halskau
- Department of Biomedicine, University of Bergen, Bergen, Norway
| | - Anne Baumann
- Department of Biomedicine, University of Bergen, Bergen, Norway
| | - David Rodriguez-Larrea
- Facultad de Ciencias, Departamento de Quimica Fisica, Universidad de Granada, Granada, Spain
- Department of Chemistry, University of Oxford, Oxford, United Kingdom
| | - Miguel Costas
- Facultad de Ciencias, Departamento de Quimica Fisica, Universidad de Granada, Granada, Spain
- Laboratorio de Biofisicoquímica, Departamento de Fisicoquímica, Facultad de Química, Universidad Nacional Autónoma de México, México DF, México
| | - Jarl Underhaug
- Department of Biomedicine, University of Bergen, Bergen, Norway
| | - Jose M. Sanchez-Ruiz
- Facultad de Ciencias, Departamento de Quimica Fisica, Universidad de Granada, Granada, Spain
| | - Aurora Martinez
- Department of Biomedicine, University of Bergen, Bergen, Norway
- * E-mail:
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20
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Luo JJ, Wu FG, Qin SS, Yu ZW. In Situ Unfolded Lysozyme Induces the Lipid Lateral Redistribution of a Mixed Lipid Model Membrane. J Phys Chem B 2012; 116:12381-8. [DOI: 10.1021/jp304339t] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jun-Jie Luo
- Key Laboratory of Bioorganic Phosphorous
Chemistry
and Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing 100084, People's Republic
of China
| | - Fu-Gen Wu
- Key Laboratory of Bioorganic Phosphorous
Chemistry
and Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing 100084, People's Republic
of China
| | - Shan-Shan Qin
- Key Laboratory of Bioorganic Phosphorous
Chemistry
and Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing 100084, People's Republic
of China
| | - Zhi-Wu Yu
- Key Laboratory of Bioorganic Phosphorous
Chemistry
and Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing 100084, People's Republic
of China
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21
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Gilde F, Maniti O, Guillot R, Mano JF, Logeart-Avramoglou D, Sailhan F, Picart C. Secondary structure of rhBMP-2 in a protective biopolymeric carrier material. Biomacromolecules 2012; 13:3620-6. [PMID: 22967015 DOI: 10.1021/bm3010808] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Efficient delivery of growth factors is one of the great challenges of tissue engineering. Polyelectrolyte multilayer films (PEM) made of biopolymers have recently emerged as an interesting carrier for delivering recombinant human bone morphogenetic protein 2 (rhBMP-2 noted here BMP-2) to cells in a matrix-bound manner. We recently showed that PEM made of poly(l-lysine) and hyaluronan (PLL/HA) can retain high and tunable quantities of BMP-2 and can deliver it to cells to induce their differentiation in osteoblasts. Here, we investigate quantitatively by Fourier transform infrared spectroscopy (FTIR) the secondary structure of BMP-2 in solution as well as trapped in a biopolymeric thin film. We reveal that the major structural elements of BMP-2 in solution are intramolecular β-sheets and unordered structures as well as α-helices. Furthermore, we studied the secondary structure of rhBMP-2 trapped in hydrated films and in dry films since drying is an important step for future applications of these bioactive films onto orthopedic biomaterials. We demonstrate that the structural elements were preserved when BMP-2 was trapped in the biopolymeric film in hydrated conditions and, to a lesser extent, in dry state. Importantly, its bioactivity was maintained after drying of the film. Our results appear highly promising for future applications of these films as coatings of biomedical materials, to deliver bioactive proteins while preserving their bioactivity upon storage in dry state.
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Affiliation(s)
- Flora Gilde
- CNRS UMR 5628 (LMGP), Grenoble Institute of Technology and CNRS, 3 parvis Louis Néel, F-38016 Grenoble Cedex, France
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22
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Ferranti P, Mamone G, Picariello G, Addeo F. The “dark side” of β-lactoglobulin: Unedited structural features suggest unexpected functions. J Chromatogr A 2011; 1218:3423-31. [DOI: 10.1016/j.chroma.2011.03.059] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2011] [Revised: 03/24/2011] [Accepted: 03/25/2011] [Indexed: 12/13/2022]
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23
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Ge N, Zhang X, Keiderling TA. Kinetic Studies of the Interaction of β-Lactoglobulin with Model Membranes: Stopped-Flow CD and Fluorescence Studies. Biochemistry 2010; 49:8831-8. [PMID: 20822106 DOI: 10.1021/bi1008936] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ning Ge
- Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street (m/c 111), Chicago, Illinois 60607-7061
| | - Xiuqi Zhang
- Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street (m/c 111), Chicago, Illinois 60607-7061
| | - Timothy A. Keiderling
- Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street (m/c 111), Chicago, Illinois 60607-7061
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24
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Junghans A, Champagne C, Cayot P, Loupiac C, Köper I. Protein-lipid interactions at the air-water interface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:12049-12053. [PMID: 20557079 DOI: 10.1021/la100036v] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Protein-lipid interactions play an important role in a variety of fields, for example in pharmaceutical research, biosensing, or food science. However, the underlying fundamental processes that govern the interplay of lipids and proteins are often very complex and are therefore studied using model systems. Here, Langmuir monolayers were used to probe the interaction of a model protein with lipid films at the air-water interface. The protein beta-lactoglobulin (beta lg) is the major component in bovine milk serum, where it coexists with the milk fat globular membrane. During homogenization of milk, beta lg adsorbs to the interface of lipid fat globules and stabilizes the oil-in-water emulsion. pH and ionic strength of the subphase had a significant effect on the surface activity of the protein. Additionally, by using lipids with different charges, it could be shown that the interactions between beta lg and a phospholipid layer were driven by hydrophobic as well as by electrostatic interactions. beta lg preferentially interacted with phospholipids in an unfolded state. This could be either achieved by denaturation at the air-water interface or due to electrostatic interactions that weaken the intramolecular forces of the protein.
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Affiliation(s)
- Ann Junghans
- Max Planck Institute for Polymer Research, Mainz, Germany
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26
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Tracking molecular interactions in membranes by simultaneous ATR-FTIR-AFM. Biophys J 2009; 97:1225-31. [PMID: 19686671 DOI: 10.1016/j.bpj.2009.06.013] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2009] [Revised: 05/26/2009] [Accepted: 06/11/2009] [Indexed: 11/23/2022] Open
Abstract
In situ atomic force microscopy (AFM) is an exceedingly powerful and useful technique for characterizing the structure and assembly of proteins in real-time, in situ, and especially at model membrane interfaces, such as supported planar lipid bilayers. There remains, however, a fundamental challenge with AFM-based imaging. Conclusions are inferred based on morphological or topographical features. It is conventionally very difficult to use AFM to confirm specific molecular conformation, especially in the case of protein-membrane interactions. In this case, a protein may undergo subtle conformational changes upon insertion in the membrane that may be critical to its function. AFM lacks the ability to directly measure such conformational changes and can, arguably, only resolve features that are topographically distinct. To address these issues, we have developed a platform that integrates in situ AFM with attenuated total reflection-Fourier transform infrared (ATR-FTIR) spectroscopy. This combination of tools provides a unique means of tracking, simultaneously, conformational changes, not resolvable by in situ AFM, with topographical details that are not readily identified by conventional spectroscopy. Preliminary studies of thermal transitions in supported lipid bilayers and direct evidence of lipid-induced conformational changes in adsorbed proteins illustrates the potential of this coupled in situ functional imaging strategy.
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27
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Caro AL, Rodríguez Niño MR, Rodríguez Patino JM. Dynamics of penetration of dipalmitoyl-phosphatidyl-choline (DPPC) monolayers by β-casein. Colloids Surf A Physicochem Eng Asp 2009. [DOI: 10.1016/j.colsurfa.2009.03.056] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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28
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Mandalari G, Mackie AM, Rigby NM, Wickham MSJ, Mills ENC. Physiological phosphatidylcholine protects bovine β-lactoglobulin from simulated gastrointestinal proteolysis. Mol Nutr Food Res 2009; 53 Suppl 1:S131-9. [DOI: 10.1002/mnfr.200800321] [Citation(s) in RCA: 88] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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29
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Enhanced activity of horseradish peroxidase in Langmuir–Blodgett films of phospholipids. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2008; 1778:2291-7. [DOI: 10.1016/j.bbamem.2008.05.012] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2008] [Revised: 05/25/2008] [Accepted: 05/28/2008] [Indexed: 11/23/2022]
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30
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Martins P, Gomes F, Vaz W, Moreno M. Binding of phospholipids to β-Lactoglobulin and their transfer to lipid bilayers. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2008; 1778:1308-15. [DOI: 10.1016/j.bbamem.2008.02.011] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2007] [Revised: 02/21/2008] [Accepted: 02/21/2008] [Indexed: 10/22/2022]
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31
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The interaction of liver fatty-acid-binding protein (FABP) with anionic phospholipid vesicles: is there extended phospholipid anchorage under these conditions? Biochem J 2008; 410:123-9. [PMID: 17935485 DOI: 10.1042/bj20071109] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Liver FABP (fatty-acid-binding protein) binds a variety of non-polar anionic ligands including fatty acids, fatty acyl CoAs, lysophospholipids and bile acids. Liver FABP is also able to bind to anionic phospholipid vesicles under conditions of low ionic strength, and membrane binding results in the release of bound ligand. However, the molecular interactions involved in binding to the phospholipid interface and the mechanism of ligand release are not known. Ligand release could be due to a significant conformational change in the protein at the interface or interaction of a phospholipid molecule with the ligand-binding cavity of the protein resulting in ligand displacement. Two portal mutant proteins of liver FABP, L28W and M74W, have now been used to investigate the binding of liver FABP to anionic phospholipid vesicles, monitoring changes in fluorescence and also fluorescence quenching in the presence of brominated lipids. There is a large increase in fluorescence intensity when the L28W mutant protein binds to vesicles prepared from DOPG (dioleoyl-sn-phosphatidylglycerol), but a large decrease in fluorescence intensity when the M74W mutant binds to these vesicles. The Br(4)-phospholipid prepared by bromination of DOPG dramatically quenches both L28W and M74W, consistent with the close proximity of a fatty acyl chain to the tryptophan residues. The binding of liver FABP to DOPG vesicles is accompanied by only a minimal change in the CD spectrum. Overall, the results are consistent with a molecule of anionic phospholipid interacting with the central cavity of the liver FABP, possibly involving the phospholipid molecule in an extended conformation.
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