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Toke O. Structural and Dynamic Determinants of Molecular Recognition in Bile Acid-Binding Proteins. Int J Mol Sci 2022; 23:ijms23010505. [PMID: 35008930 PMCID: PMC8745080 DOI: 10.3390/ijms23010505] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Revised: 12/30/2021] [Accepted: 12/31/2021] [Indexed: 12/12/2022] Open
Abstract
Disorders in bile acid transport and metabolism have been related to a number of metabolic disease states, atherosclerosis, type-II diabetes, and cancer. Bile acid-binding proteins (BABPs), a subfamily of intracellular lipid-binding proteins (iLBPs), have a key role in the cellular trafficking and metabolic targeting of bile salts. Within the family of iLBPs, BABPs exhibit unique binding properties including positive binding cooperativity and site-selectivity, which in different tissues and organisms appears to be tailored to the local bile salt pool. Structural and biophysical studies of the past two decades have shed light on the mechanism of bile salt binding at the atomic level, providing us with a mechanistic picture of ligand entry and release, and the communication between the binding sites. In this review, we discuss the emerging view of bile salt recognition in intestinal- and liver-BABPs, with examples from both mammalian and non-mammalian species. The structural and dynamic determinants of the BABP-bile–salt interaction reviewed herein set the basis for the design and development of drug candidates targeting the transcellular traffic of bile salts in enterocytes and hepatocytes.
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Affiliation(s)
- Orsolya Toke
- Laboratory for NMR Spectroscopy, Structural Research Centre, Research Centre for Natural Sciences, 2 Magyar Tudósok Körútja, H-1117 Budapest, Hungary
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2
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A simple surface biofunctionalization strategy to inhibit the biofilm formation by Staphylococcus aureus on solid substrates. Colloids Surf B Biointerfaces 2019; 183:110432. [DOI: 10.1016/j.colsurfb.2019.110432] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2019] [Revised: 07/18/2019] [Accepted: 08/07/2019] [Indexed: 11/16/2022]
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Sosa Morales MC, Juárez AC, Montich GG, Álvarez RMS. Interaction of the antibiotic peptide nisin with anionic membranes in different phase-states: a vibrational study. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2019; 215:389-397. [PMID: 30856583 DOI: 10.1016/j.saa.2019.03.009] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2018] [Revised: 02/20/2019] [Accepted: 03/04/2019] [Indexed: 06/09/2023]
Abstract
Interactions between the antibiotic peptide nisin and multilamellar vesicles of phosphoglycerol lipids in different phase-states were studied using vibrational spectroscopy. The infrared amide I' band of nisin, both in solution and in the membrane-bound state, was analyzed in the temperature range comprised between 20 and 60 °C in order to study its conformational behavior. Nisin presented mainly unordered and β-turns conformations. Their relative populations varied according to the environment and as the temperature increased: β turns were more favored in the membrane-bound state than in solution, but at higher temperatures the disordered conformation was dominant in both states. Spectral changes of specific infrared bands belonging to the hydrocarbon and polar moieties of lipids were also analyzed to evaluate the perturbation of the lipid membrane order. Nisin interactions with the membrane polar region induced a high restriction to water incorporation, promoting a small increase in the temperature of the lipid phase transition. Raman spectra of nisin/phosphoglycerol systems at ambient temperature were also analyzed. They revealed that the peptide incorporation to a membrane in the fluid phase caused drastic structural modifications in the hydrophobic region of the bilayer. Although nisin may be able to disrupt the hydrophobic portion of the bilayer in the gel phase, the most of the peptide molecule remained at the membrane surface interacting with the polar headgroups. This work provides evidence of a differential effect of nisin on anionic membranes, depending on the phase-state of the lipid.
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Affiliation(s)
- Marcelo C Sosa Morales
- Instituto de Química del Noroeste Argentino (INQUINOA), Universidad Nacional de Tucumán, CONICET, San Miguel de Tucumán, Argentina
| | - Ana C Juárez
- Instituto de Química del Noroeste Argentino (INQUINOA), Universidad Nacional de Tucumán, CONICET, San Miguel de Tucumán, Argentina
| | - Guillermo G Montich
- Departamento de Química Biológica Ranwel Caputto, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba, Argentina; Centro de Investigaciones en Química Biológica de Córdoba (CIQUIBIC), CONICET, Universidad Nacional de Córdoba, Córdoba, Argentina
| | - Rosa M S Álvarez
- Instituto de Química del Noroeste Argentino (INQUINOA), Universidad Nacional de Tucumán, CONICET, San Miguel de Tucumán, Argentina.
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Galassi VV, Villarreal MA, Montich GG. Relevance of the protein macrodipole in the membrane-binding process. Interactions of fatty-acid binding proteins with cationic lipid membranes. PLoS One 2018. [PMID: 29518146 PMCID: PMC5843346 DOI: 10.1371/journal.pone.0194154] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
The fatty acid-binding proteins L-BABP and Rep1-NCXSQ bind to anionic lipid membranes by electrostatic interactions. According to Molecular Dynamics (MD) simulations, the interaction of the protein macrodipole with the membrane electric field is a driving force for protein binding and orientation in the interface. To further explore this hypothesis, we studied the interactions of these proteins with cationic lipid membranes. As in the case of anionic lipid membranes, we found that both proteins, carrying a negative as well as a positive net charge, were bound to the positively charged membrane. Their major axis, those connecting the bottom of the β-barrel with the α-helix portal domain, were rotated about 180 degrees as compared with their orientations in the anionic lipid membranes. Fourier transform infrared (FTIR) spectroscopy of the proteins showed that the positively charged membranes were also able to induce conformational changes with a reduction of the β-strand proportion and an increase in α-helix secondary structure. Fatty acid-binding proteins (FABPs) are involved in several cell processes, such as maintaining lipid homeostasis in cells. They transport hydrophobic molecules in aqueous medium and deliver them into lipid membranes. Therefore, the interfacial orientation and conformation, both shown herein to be electrostatically determined, have a strong correlation with the specific mechanism by which each particular FABP exerts its biological function.
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Affiliation(s)
- Vanesa V. Galassi
- Universidad Nacional de Córdoba, Facultad de Ciencias Químicas, Departamento de Química Biológica “Ranwel Caputto”, Córdoba, Argentina
- CONICET, Universidad Nacional de Córdoba, Centro de Investigaciones en Química Biológica de Córdoba (CIQUIBIC), Córdoba, Argentina
| | - Marcos A. Villarreal
- Universidad Nacional de Córdoba, Facultad de Ciencias Químicas, Departamento de Química Teórica y Computacional, Córdoba, Argentina
- CONICET, Universidad Nacional de Córdoba. Instituto de Investigaciones en Fisicoquímica de Córdoba (INFIQC), Córdoba, Argentina
| | - Guillermo G. Montich
- Universidad Nacional de Córdoba, Facultad de Ciencias Químicas, Departamento de Química Biológica “Ranwel Caputto”, Córdoba, Argentina
- CONICET, Universidad Nacional de Córdoba, Centro de Investigaciones en Química Biológica de Córdoba (CIQUIBIC), Córdoba, Argentina
- * E-mail:
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5
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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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Ceccon A, D'Onofrio M, Zanzoni S, Longo DL, Aime S, Molinari H, Assfalg M. NMR investigation of the equilibrium partitioning of a water-soluble bile salt protein carrier to phospholipid vesicles. Proteins 2013; 81:1776-91. [DOI: 10.1002/prot.24329] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2013] [Revised: 04/29/2013] [Accepted: 05/09/2013] [Indexed: 11/07/2022]
Affiliation(s)
- Alberto Ceccon
- Department of Biotechnology; University of Verona; 37134 Verona Italy
| | | | - Serena Zanzoni
- Department of Biotechnology; University of Verona; 37134 Verona Italy
| | - Dario Livio Longo
- Department of Molecular Biotechnologies and Health Sciences; Molecular Imaging Center, University of Torino; 10126 Torino Italy
| | - Silvio Aime
- Department of Molecular Biotechnologies and Health Sciences; Molecular Imaging Center, University of Torino; 10126 Torino Italy
| | | | - Michael Assfalg
- Department of Biotechnology; University of Verona; 37134 Verona Italy
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Decca MB, Galassi VV, Perduca M, Monaco HL, Montich GG. Influence of the Lipid Phase State and Electrostatic Surface Potential on the Conformations of a Peripherally Bound Membrane Protein. J Phys Chem B 2010; 114:15141-50. [DOI: 10.1021/jp104035z] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- María B. Decca
- Centro de Investigaciones en Química Biológica de Córdoba (CIQUIBIC, UNC−CONICET), Departamento de Química Biológica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Haya de la Torre y Medina Allende, Ciudad Universitaria, X5000HUA, Córdoba, República Argentina, and Laboratorio di Biocrystallografia, Dipartimento Scientifico e Tecnologico, Università di Verona, Italia
| | - Vanesa V. Galassi
- Centro de Investigaciones en Química Biológica de Córdoba (CIQUIBIC, UNC−CONICET), Departamento de Química Biológica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Haya de la Torre y Medina Allende, Ciudad Universitaria, X5000HUA, Córdoba, República Argentina, and Laboratorio di Biocrystallografia, Dipartimento Scientifico e Tecnologico, Università di Verona, Italia
| | - Massimiliano Perduca
- Centro de Investigaciones en Química Biológica de Córdoba (CIQUIBIC, UNC−CONICET), Departamento de Química Biológica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Haya de la Torre y Medina Allende, Ciudad Universitaria, X5000HUA, Córdoba, República Argentina, and Laboratorio di Biocrystallografia, Dipartimento Scientifico e Tecnologico, Università di Verona, Italia
| | - Hugo L. Monaco
- Centro de Investigaciones en Química Biológica de Córdoba (CIQUIBIC, UNC−CONICET), Departamento de Química Biológica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Haya de la Torre y Medina Allende, Ciudad Universitaria, X5000HUA, Córdoba, República Argentina, and Laboratorio di Biocrystallografia, Dipartimento Scientifico e Tecnologico, Università di Verona, Italia
| | - Guillermo G. Montich
- Centro de Investigaciones en Química Biológica de Córdoba (CIQUIBIC, UNC−CONICET), Departamento de Química Biológica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Haya de la Torre y Medina Allende, Ciudad Universitaria, X5000HUA, Córdoba, República Argentina, and Laboratorio di Biocrystallografia, Dipartimento Scientifico e Tecnologico, Università di Verona, Italia
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Abstract
The liver bile acid-binding proteins, L-BABPs, formerly called the liver "basic" fatty acid-binding proteins, are a subfamily of the fatty acid-binding proteins, FABPs. All the members of this protein group share the same fold: a 10 stranded beta barrel in which two short helices are inserted in between the first and the second strand of antiparallel beta sheet. The barrel encloses the ligand binding cavity of the protein while the two helices are believed to be involved in ligand accessibility to the binding site. The L-BABP subfamily has been found to be present in the liver of several vertebrates: fish, amphibians, reptiles, and birds but not in mammals. The members of the FABP family present in mammals that appear to be more closely related to the L-BABPs are the liver FABPs and the ileal BABPs, both very extensively studied. Several L-BABP X-ray structures are available and chicken L-BABP has also been studied using NMR spectroscopy. The stoichiometry of ligand binding for bile acids, first determined by X-ray crystallography for the chicken liver protein, is of two cholates per protein molecule with the only exception of zebrafish L-BABP which, due to the presence of a disulfide bridge, has a stoichiometry of 1:1. The stoichiometry of ligand binding for fatty acids, determined with several different techniques, is 1:1. An unanswered question of great relevance is the identity of the protein that in mammals performs the function that in other vertebrates is carried out by the L-BABPS.
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Affiliation(s)
- Hugo L Monaco
- Department of Biotechnology, University of Verona, Strada Le Grazie 15, Verona 37134, Italy.
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Pedò M, Löhr F, D'Onofrio M, Assfalg M, Dötsch V, Molinari H. NMR studies reveal the role of biomembranes in modulating ligand binding and release by intracellular bile acid binding proteins. J Mol Biol 2009; 394:852-63. [PMID: 19836400 DOI: 10.1016/j.jmb.2009.10.014] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2009] [Revised: 10/05/2009] [Accepted: 10/08/2009] [Indexed: 10/20/2022]
Abstract
Bile acid molecules are transferred vectorially between basolateral and apical membranes of hepatocytes and enterocytes in the context of the enterohepatic circulation, a process regulating whole body lipid homeostasis. This work addresses the role of the cytosolic lipid binding proteins in the intracellular transfer of bile acids between different membrane compartments. We present nuclear magnetic resonance (NMR) data describing the ternary system composed of the bile acid binding protein, bile acids, and membrane mimetic systems, such as anionic liposomes. This work provides evidence that the investigated liver bile acid binding protein undergoes association with the anionic membrane and binding-induced partial unfolding. The addition of the physiological ligand to the protein-liposome mixture is capable of modulating this interaction, shifting the equilibrium towards the free folded holo protein. An ensemble of NMR titration experiments, based on nitrogen-15 protein and ligand observation, confirm that the membrane and the ligand establish competing binding equilibria, modulating the cytoplasmic permeability of bile acids. These results support a mechanism of ligand binding and release controlled by the onset of a bile salt concentration gradient within the polarized cell. The location of a specific protein region interacting with liposomes is highlighted.
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Affiliation(s)
- Massimo Pedò
- Department of Biotechnology, University of Verona, Strada Le Grazie 15, 37134 Verona, Italy
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Basova LV, Tiktopulo EI, Kutyshenko VP, Mauk AG, Bychkova VE. Phospholipid membranes affect tertiary structure of the soluble cytochrome b5 heme-binding domain. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2008; 1778:1015-26. [PMID: 18275841 DOI: 10.1016/j.bbamem.2007.12.028] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2007] [Revised: 12/21/2007] [Accepted: 12/28/2007] [Indexed: 11/30/2022]
Abstract
The influence of charged phospholipid membranes on the conformational state of the water-soluble fragment of cytochrome b5 has been investigated by a variety of techniques at neutral pH. The results of this work provide the first evidence that aqueous solutions with high phospholipid/protein molar ratios (pH 7.2) induce the cytochrome to undergo a structural transition from the native conformation to an intermediate state with molten-globule like properties that occur in the presence of an artificial membrane surface and that leads to binding of the protein to the membrane. At other phospholipid/protein ratios, equilibrium was observed between cytochrome free in solution and cytochrome bound to the surface of vesicles. Inhibition of protein binding to the vesicles with increasing ionic strength indicated for the most part an electrostatic contribution to the stability of cytochrome b5-vesicle interactions at pH 7.2. The possible physiological role of membrane-induced conformational change in the structure of cytochrome b5 upon the interaction with its redox partners is discussed.
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Affiliation(s)
- Liana V Basova
- Institute of Protein Research, Russian Academy of Sciences, Pushchino, Moscow Region, 142290 Russia
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