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Basak S, Mallick R, Banerjee A, Pathak S, Duttaroy AK. Cytoplasmic fatty acid-binding proteins in metabolic diseases and cancers. ADVANCES IN PROTEIN CHEMISTRY AND STRUCTURAL BIOLOGY 2022; 132:143-174. [PMID: 36088074 DOI: 10.1016/bs.apcsb.2022.05.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Cytoplasmic fatty acid-binding proteins (FABPs) are multipurpose proteins that can modulate lipid fluxes, trafficking, signaling, and metabolism. FABPs regulate metabolic and inflammatory pathways, its inhibition can improve type 2 diabetes mellitus and atherosclerosis. In addition, FABPs are involved in obesity, metabolic disease, cardiac dysfunction, and cancers. FABPs are promising tissue biomarkers in solid tumors for diagnostic and/or prognostic targets for novel therapeutic strategies. The signaling responsive elements of FABPs and determinants of FABP-mediated functions may be exploited in preventing or treating these diseases.
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Affiliation(s)
- Sanjay Basak
- Molecular Biology Division, ICMR-National Institute of Nutrition, Indian Council of Medical Research, Hyderabad, India
| | - Rahul Mallick
- A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Finland
| | - Antara Banerjee
- Department of Medical Biotechnology, Faculty of Allied Health Sciences, Chettinad Academy of Research and Education (CARE), Chettinad Hospital and Research Institute (CHRI), Chennai, India
| | - Surajit Pathak
- Department of Medical Biotechnology, Faculty of Allied Health Sciences, Chettinad Academy of Research and Education (CARE), Chettinad Hospital and Research Institute (CHRI), Chennai, India
| | - Asim K Duttaroy
- Department of Nutrition, Institute of Basic Medical Sciences, Faculty of Medicine, University of Oslo, Oslo, Norway.
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2
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D’Anneo A, Bavisotto CC, Gammazza AM, Paladino L, Carlisi D, Cappello F, de Macario EC, Macario AJL, Lauricella M. Lipid chaperones and associated diseases: a group of chaperonopathies defining a new nosological entity with implications for medical research and practice. Cell Stress Chaperones 2020; 25:805-820. [PMID: 32856199 PMCID: PMC7591661 DOI: 10.1007/s12192-020-01153-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2020] [Revised: 07/16/2020] [Accepted: 08/10/2020] [Indexed: 02/08/2023] Open
Abstract
Fatty acid-binding proteins (FABPs) are lipid chaperones assisting in the trafficking of long-chain fatty acids with functions in various cell compartments, including oxidation, signaling, gene-transcription regulation, and storage. The various known FABP isoforms display distinctive tissue distribution, but some are active in more than one tissue. Quantitative and/or qualitative changes of FABPs are associated with pathological conditions. Increased circulating levels of FABPs are biomarkers of disorders such as obesity, insulin resistance, cardiovascular disease, and cancer. Deregulated expression and malfunction of FABPs can result from genetic alterations or posttranslational modifications and can be pathogenic. We have assembled the disorders with abnormal FABPs as chaperonopathies in a distinct nosological entity. This entity is similar but separate from that encompassing the chaperonopathies pertaining to protein chaperones. In this review, we discuss the role of FABPs in the pathogenesis of metabolic syndrome, cancer, and neurological diseases. We highlight the opportunities for improving diagnosis and treatment that open by encompassing all these pathological conditions within of a coherent nosological group, focusing on abnormal lipid chaperones as biomarkers of disease and etiological-pathogenic factors.
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Affiliation(s)
- Antonella D’Anneo
- Department of Biological, Chemical and Pharmaceutical Sciences and Technologies (STEBICEF), Laboratory of Biochemistry, University of Palermo, 90127 Palermo, Italy
| | - Celeste Caruso Bavisotto
- Department of Biomedicine, Neurosciences and Advanced Diagnostics (BIND), Institute of Anatomy, University of Palermo, 90127 Palermo, Italy
- Euro-Mediterranean Institute of Science and Technology (IEMEST), 90139 Palermo, Italy
| | - Antonella Marino Gammazza
- Department of Biomedicine, Neurosciences and Advanced Diagnostics (BIND), Institute of Anatomy, University of Palermo, 90127 Palermo, Italy
- Euro-Mediterranean Institute of Science and Technology (IEMEST), 90139 Palermo, Italy
| | - Letizia Paladino
- Department of Biomedicine, Neurosciences and Advanced Diagnostics (BIND), Institute of Anatomy, University of Palermo, 90127 Palermo, Italy
- Euro-Mediterranean Institute of Science and Technology (IEMEST), 90139 Palermo, Italy
| | - Daniela Carlisi
- Department of Biomedicine, Neurosciences and Advanced Diagnostics (BIND), Institute of Biochemistry, University of Palermo, 90127 Palermo, Italy
| | - Francesco Cappello
- Department of Biomedicine, Neurosciences and Advanced Diagnostics (BIND), Institute of Anatomy, University of Palermo, 90127 Palermo, Italy
- Euro-Mediterranean Institute of Science and Technology (IEMEST), 90139 Palermo, Italy
| | - Everly Conway de Macario
- Euro-Mediterranean Institute of Science and Technology (IEMEST), 90139 Palermo, Italy
- Department of Microbiology and Immunology, School of Medicine, University of Maryland at Baltimore-Institute of Marine and Environmental Technology (IMET), Baltimore, MD 21202 USA
| | - Alberto J. L. Macario
- Euro-Mediterranean Institute of Science and Technology (IEMEST), 90139 Palermo, Italy
- Department of Microbiology and Immunology, School of Medicine, University of Maryland at Baltimore-Institute of Marine and Environmental Technology (IMET), Baltimore, MD 21202 USA
| | - Marianna Lauricella
- Department of Biomedicine, Neurosciences and Advanced Diagnostics (BIND), Institute of Biochemistry, University of Palermo, 90127 Palermo, Italy
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3
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Lai MP, Katz FS, Bernard C, Storch J, Stark RE. Two fatty acid-binding proteins expressed in the intestine interact differently with endocannabinoids. Protein Sci 2020; 29:1606-1617. [PMID: 32298508 DOI: 10.1002/pro.3875] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2020] [Revised: 04/08/2020] [Accepted: 04/12/2020] [Indexed: 11/07/2022]
Abstract
Two different members of the fatty acid-binding protein (FABP) family are found in enterocyte cells of the gastrointestinal system, namely liver-type and intestinal fatty acid-binding proteins (LFABP and IFABP, also called FABP1 and FABP2, respectively). Striking phenotypic differences have been observed in knockout mice for either protein, for example, high fat-fed IFABP-null mice remained lean, whereas LFABP-null mice were obese, correlating with differences in food intake. This finding prompted us to investigate the role each protein plays in directing the specificity of binding to ligands involved in appetite regulation, such as fatty acid ethanolamides and related endocannabinoids. We determined the binding affinities for nine structurally related ligands using a fluorescence competition assay, revealing tighter binding to IFABP than LFABP for all ligands tested. We found that the head group of the ligand had more impact on binding affinity than the alkyl chain, with the strongest binding observed for the carboxyl group, followed by the amide, and then the glycerol ester. These trends were confirmed using two-dimensional 1 H-15 N nuclear magnetic resonance (NMR) to monitor chemical shift perturbation of the protein backbone resonances upon titration with ligand. Interestingly, the NMR data revealed that different residues of IFABP were involved in the coordination of endocannabinoids than those implicated for fatty acids, whereas the same residues of LFABP were involved for both classes of ligand. In addition, we identified residues that are uniquely affected by binding of all types of ligand to IFABP, suggesting a rationale for its tighter binding affinity compared with LFABP.
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Affiliation(s)
- May Poh Lai
- Department of Chemistry and Biochemistry, CUNY City College of New York, New York, New York, USA.,Ph.D. Program in Biochemistry, The Graduate Center of the City University of New York (CUNY), New York, New York, USA.,CUNY Institute for Macromolecular Assemblies, New York, New York, USA
| | - Francine S Katz
- Department of Chemistry and Biochemistry, CUNY City College of New York, New York, New York, USA.,CUNY Institute for Macromolecular Assemblies, New York, New York, USA
| | - Cédric Bernard
- Department of Chemistry and Biochemistry, CUNY City College of New York, New York, New York, USA.,CUNY Institute for Macromolecular Assemblies, New York, New York, USA
| | - Judith Storch
- Department of Nutritional Sciences and Rutgers Center for Lipid Research, School of Environmental and Biological Sciences, Rutgers University, New Brunswick, New Jersey, USA
| | - Ruth E Stark
- Department of Chemistry and Biochemistry, CUNY City College of New York, New York, New York, USA.,Ph.D. Program in Biochemistry, The Graduate Center of the City University of New York (CUNY), New York, New York, USA.,CUNY Institute for Macromolecular Assemblies, New York, New York, USA
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4
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Falomir-Lockhart LJ, Cavazzutti GF, Giménez E, Toscani AM. Fatty Acid Signaling Mechanisms in Neural Cells: Fatty Acid Receptors. Front Cell Neurosci 2019; 13:162. [PMID: 31105530 PMCID: PMC6491900 DOI: 10.3389/fncel.2019.00162] [Citation(s) in RCA: 83] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Accepted: 04/08/2019] [Indexed: 12/15/2022] Open
Abstract
Fatty acids (FAs) are typically associated with structural and metabolic roles, as they can be stored as triglycerides, degraded by β-oxidation or used in phospholipids’ synthesis, the main components of biological membranes. It has been shown that these lipids exhibit also regulatory functions in different cell types. FAs can serve as secondary messengers, as well as modulators of enzymatic activities and substrates for cytokines synthesis. More recently, it has been documented a direct activity of free FAs as ligands of membrane, cytosolic, and nuclear receptors, and cumulative evidence has emerged, demonstrating its participation in a wide range of physiological and pathological conditions. It has been long known that the central nervous system is enriched with poly-unsaturated FAs, such as arachidonic (C20:4ω-6) or docosohexaenoic (C22:6ω-3) acids. These lipids participate in the regulation of membrane fluidity, axonal growth, development, memory, and inflammatory response. Furthermore, a whole family of low molecular weight compounds derived from FAs has also gained special attention as the natural ligands for cannabinoid receptors or key cytokines involved in inflammation, largely expanding the role of FAs as precursors of signaling molecules. Nutritional deficiencies, and alterations in lipid metabolism and lipid signaling have been associated with developmental and cognitive problems, as well as with neurodegenerative diseases. The molecular mechanism behind these effects still remains elusive. But in the last two decades, different families of proteins have been characterized as receptors mediating FAs signaling. This review focuses on different receptors sensing and transducing free FAs signals in neural cells: (1) membrane receptors of the family of G Protein Coupled Receptors known as Free Fatty Acid Receptors (FFARs); (2) cytosolic transport Fatty Acid-Binding Proteins (FABPs); and (3) transcription factors Peroxisome Proliferator-Activated Receptors (PPARs). We discuss how these proteins modulate and mediate direct regulatory functions of free FAs in neural cells. Finally, we briefly discuss the advantages of evaluating them as potential targets for drug design in order to manipulate lipid signaling. A thorough characterization of lipid receptors of the nervous system could provide a framework for a better understanding of their roles in neurophysiology and, potentially, help for the development of novel drugs against aging and neurodegenerative processes.
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Affiliation(s)
- Lisandro Jorge Falomir-Lockhart
- Instituto de Investigaciones Bioquímicas de La Plata (INIBIOLP), Centro Científico Tecnológico - La Plata, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), La Plata, Argentina.,Facultad de Ciencias Exactas, Universidad Nacional de La Plata (UNLP), La Plata, Argentina
| | - Gian Franco Cavazzutti
- Instituto de Investigaciones Bioquímicas de La Plata (INIBIOLP), Centro Científico Tecnológico - La Plata, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), La Plata, Argentina.,Facultad de Ciencias Exactas, Universidad Nacional de La Plata (UNLP), La Plata, Argentina
| | - Ezequiel Giménez
- Instituto de Investigaciones Bioquímicas de La Plata (INIBIOLP), Centro Científico Tecnológico - La Plata, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), La Plata, Argentina.,Facultad de Ciencias Médicas, Universidad Nacional de La Plata (UNLP), La Plata, Argentina
| | - Andrés Martín Toscani
- Instituto de Investigaciones Bioquímicas de La Plata (INIBIOLP), Centro Científico Tecnológico - La Plata, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), La Plata, Argentina.,Facultad de Ciencias Médicas, Universidad Nacional de La Plata (UNLP), La Plata, Argentina
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5
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Hao J, Zhang Y, Yan X, Yan F, Sun Y, Zeng J, Waigel S, Yin Y, Fraig MM, Egilmez NK, Suttles J, Kong M, Liu S, Cleary MP, Sauter E, Li B. Circulating Adipose Fatty Acid Binding Protein Is a New Link Underlying Obesity-Associated Breast/Mammary Tumor Development. Cell Metab 2018; 28:689-705.e5. [PMID: 30100196 PMCID: PMC6221972 DOI: 10.1016/j.cmet.2018.07.006] [Citation(s) in RCA: 87] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/27/2017] [Revised: 04/24/2018] [Accepted: 07/11/2018] [Indexed: 12/26/2022]
Abstract
It is clear that obesity increases the risk of many types of cancer, including breast cancer. However, the underlying molecular mechanisms by which obesity is linked to cancer risk remain to be defined. Herein, we report that circulating adipose fatty acid binding protein (A-FABP) promotes obesity-associated breast cancer development. Using clinical samples, we demonstrated that circulating A-FABP levels were significantly increased in obese patients with breast cancer in comparison with those without breast cancer. Circulating A-FABP released by adipose tissue directly targeted mammary tumor cells, enhancing tumor stemness and aggressiveness through activation of the IL-6/STAT3/ALDH1 pathway. Importantly, genetic deletion of A-FABP successfully reduced tumor ALHD1 activation and obesity-associated mammary tumor growth and development in different mouse models. Collectively, these data suggest circulating A-FABP as a new link between obesity and breast cancer risk, thereby revealing A-FABP as a potential new therapeutic target for treatment of obesity-associated cancers.
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Affiliation(s)
- Jiaqing Hao
- Department of Microbiology and Immunology, University of Louisville, 505 South Hancock Street, Louisville, KY 40202, USA
| | - Yuwen Zhang
- Department of Microbiology and Immunology, University of Louisville, 505 South Hancock Street, Louisville, KY 40202, USA
| | - Xiaofang Yan
- Department of Bioinformatics and Biostatistics, University of Louisville, Louisville, KY, USA
| | - Fei Yan
- The Hormel Institute, University of Minnesota, Austin, MN, USA
| | - Yanwen Sun
- Department of Microbiology and Immunology, University of Louisville, 505 South Hancock Street, Louisville, KY 40202, USA
| | - Jun Zeng
- Department of Microbiology and Immunology, University of Louisville, 505 South Hancock Street, Louisville, KY 40202, USA; School of Basic Medical Sciences, Guangzhou Medical University, Guangzhou, China
| | - Sabine Waigel
- Genomics Facility and Life Tech Supply Center, University of Louisville, Louisville, KY, USA
| | - Yanhui Yin
- Department of Immunology, Peking University Health Science Center, Beijing, China
| | - Mostafa M Fraig
- Department of Pathology and Laboratory Medicine, University of Louisville, Louisville, KY, USA
| | - Nejat K Egilmez
- Department of Microbiology and Immunology, University of Louisville, 505 South Hancock Street, Louisville, KY 40202, USA
| | - Jill Suttles
- Department of Microbiology and Immunology, University of Louisville, 505 South Hancock Street, Louisville, KY 40202, USA
| | - Maiying Kong
- Department of Bioinformatics and Biostatistics, University of Louisville, Louisville, KY, USA
| | - Shujun Liu
- The Hormel Institute, University of Minnesota, Austin, MN, USA
| | - Margot P Cleary
- The Hormel Institute, University of Minnesota, Austin, MN, USA
| | - Edward Sauter
- Hartford Healthcare Cancer Institute, Hartford, CT, USA
| | - Bing Li
- Department of Microbiology and Immunology, University of Louisville, 505 South Hancock Street, Louisville, KY 40202, USA.
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6
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Fukuda Y, Miura Y, Mizohata E, Inoue T. Structural insights into a secretory abundant heat-soluble protein from an anhydrobiotic tardigrade, Ramazzottius varieornatus. FEBS Lett 2017; 591:2458-2469. [PMID: 28703282 DOI: 10.1002/1873-3468.12752] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2017] [Revised: 07/02/2017] [Accepted: 07/06/2017] [Indexed: 12/19/2022]
Abstract
Upon stopping metabolic processes, some tardigrades can undergo anhydrobiosis. Secretory abundant heat-soluble (SAHS) proteins have been reported as candidates for anhydrobiosis-related proteins in tardigrades, which seem to protect extracellular components and/or secretory organelles. We determined structures of a SAHS protein from Ramazzottius varieornatus (RvSAHS1), which is one of the toughest tardigrades. RvSAHS1 shows a β-barrel structure similar to fatty acid-binding proteins (FABPs), in which hydrophilic residues form peculiar hydrogen bond networks, which would provide RvSAHS1 with better tolerance against dehydration. We identified two putative ligand-binding sites: one that superimposes on those of some FABPs and the other, unique to and conserved in SAHS proteins. These results indicate that SAHS proteins constitute a new FABP family.
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Affiliation(s)
- Yohta Fukuda
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Suita, Osaka, Japan
| | - Yoshimasa Miura
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Suita, Osaka, Japan
| | - Eiichi Mizohata
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Suita, Osaka, Japan
| | - Tsuyoshi Inoue
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Suita, Osaka, Japan
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7
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Zamarreño F, Giorgetti A, Amundarain MJ, Viso JF, Córsico B, Costabel MD. Conserved charged amino acids are key determinants for fatty acid binding proteins (FABPs)-membrane interactions. A multi-methodological computational approach. J Biomol Struct Dyn 2017; 36:861-877. [PMID: 28298157 DOI: 10.1080/07391102.2017.1301271] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Based on the analysis of the mechanism of ligand transfer to membranes employing in vitro methods, Fatty Acid Binding Protein (FABP) family has been divided in two subgroups: collisional and diffusional FABPs. Although the collisional mechanism has been well characterized employing in vitro methods, the structural features responsible for the difference between collisional and diffusional mechanisms remain uncertain. In this work, we have identified the amino acids putatively responsible for the interaction with membranes of both, collisional and diffusional, subgroups of FABPs. Moreover, we show how specific changes in FABPs' structure could change the mechanism of interaction with membranes. We have computed protein-membrane interaction energies for members of each subgroup of the family, and performed Molecular Dynamics simulations that have shown different configurations for the initial interaction between FABPs and membranes. In order to generalize our hypothesis, we extended the electrostatic and bioinformatics analysis over FABPs of different mammalian genus. Also, our methodological approach could be used for other systems involving protein-membrane interactions.
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Affiliation(s)
- Fernando Zamarreño
- a Departamento de Física, Grupo de Biofísica - UNS , IFISUR, Universidad Nacional del Sur, CONICET , Bahía Blanca , Argentina
| | - Alejandro Giorgetti
- b Department of Biotechnology, Faculty of Mathematical , Physical and Natural Sciences, University of Verona , Verona , Italy
| | - María Julia Amundarain
- a Departamento de Física, Grupo de Biofísica - UNS , IFISUR, Universidad Nacional del Sur, CONICET , Bahía Blanca , Argentina
| | - Juan Francisco Viso
- a Departamento de Física, Grupo de Biofísica - UNS , IFISUR, Universidad Nacional del Sur, CONICET , Bahía Blanca , Argentina
| | - Betina Córsico
- c Facultad de Ciencias Médicas, Instituto de Investigaciones Bioquímicas de La Plata (CONICET-UNLP) , Universidad Nacional de La Plata , La Plata , Argentina
| | - Marcelo D Costabel
- a Departamento de Física, Grupo de Biofísica - UNS , IFISUR, Universidad Nacional del Sur, CONICET , Bahía Blanca , Argentina
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8
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Horváth G, Bencsura Á, Simon Á, Tochtrop GP, DeKoster GT, Covey DF, Cistola DP, Toke O. Structural determinants of ligand binding in the ternary complex of human ileal bile acid binding protein with glycocholate and glycochenodeoxycholate obtained from solution NMR. FEBS J 2016; 283:541-55. [PMID: 26613247 DOI: 10.1111/febs.13610] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2015] [Revised: 11/03/2015] [Accepted: 11/24/2015] [Indexed: 01/13/2023]
Abstract
UNLABELLED Besides aiding digestion, bile salts are important signal molecules exhibiting a regulatory role in metabolic processes. Human ileal bile acid binding protein (I-BABP) is an intracellular carrier of bile salts in the epithelial cells of the distal small intestine and has a key role in the enterohepatic circulation of bile salts. Positive binding cooperativity combined with site selectivity of glycocholate and glycochenodeoxycholate, the two most abundant bile salts in the human body, make human I-BABP a unique member of the family of intracellular lipid binding proteins. Solution NMR structure of the ternary complex of human I-BABP with glycocholate and glycochenodeoxycholate reveals an extensive network of hydrogen bonds and hydrophobic interactions stabilizing the bound bile salts. Conformational changes accompanying bile salt binding affects four major regions in the protein including the C/D, E/F and G/H loops as well as the helical segment. Most of these protein regions coincide with a previously described network of millisecond time scale fluctuations in the apo protein, a motion absent in the bound state. Comparison of the heterotypic doubly ligated complex with the unligated form provides further evidence of a conformation selection mechanism of ligand entry. Structural and dynamic aspects of human I-BABP-bile salt interaction are discussed and compared with characteristics of ligand binding in other members of the intracellular lipid binding protein family. PROTEIN DATA BANK ACCESSION NUMBERS The coordinates of the 10 lowest energy structures of the human I-BABP : GCDA : GCA complex as well as the distance restraints used to calculate the final ensemble have been deposited in the Brookhaven Protein Data Bank with accession number 2MM3.
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Affiliation(s)
- Gergő Horváth
- Institute of Organic Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
| | - Ákos Bencsura
- Institute of Organic Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
| | - Ágnes Simon
- Institute of Organic Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
| | - Gregory P Tochtrop
- Department of Biochemistry and Molecular Biophysics, Washington University School of Medicine, St Louis, MO, USA.,Department of Molecular Biology and Pharmacology, Washington University School of Medicine, St Louis, MO, USA
| | - Gregory T DeKoster
- Department of Biochemistry and Molecular Biophysics, Washington University School of Medicine, St Louis, MO, USA
| | - Douglas F Covey
- Department of Molecular Biology and Pharmacology, Washington University School of Medicine, St Louis, MO, USA
| | - David P Cistola
- Department of Biochemistry and Molecular Biophysics, Washington University School of Medicine, St Louis, MO, USA
| | - Orsolya Toke
- Institute of Organic Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
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9
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Matsuoka D, Sugiyama S, Murata M, Matsuoka S. Molecular Dynamics Simulations of Heart-type Fatty Acid Binding Protein in Apo and Holo Forms, and Hydration Structure Analyses in the Binding Cavity. J Phys Chem B 2014; 119:114-27. [DOI: 10.1021/jp510384f] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Daisuke Matsuoka
- JST ERATO, Lipid Active
Structure Project, ‡Department of Chemistry, Graduate
School of Science, and §Project Research Center for Fundamental Science, Osaka University, 1-1
Machikaneyama, Toyonaka, Osaka 560-0043, Japan
| | - Shigeru Sugiyama
- JST ERATO, Lipid Active
Structure Project, ‡Department of Chemistry, Graduate
School of Science, and §Project Research Center for Fundamental Science, Osaka University, 1-1
Machikaneyama, Toyonaka, Osaka 560-0043, Japan
| | - Michio Murata
- JST ERATO, Lipid Active
Structure Project, ‡Department of Chemistry, Graduate
School of Science, and §Project Research Center for Fundamental Science, Osaka University, 1-1
Machikaneyama, Toyonaka, Osaka 560-0043, Japan
| | - Shigeru Matsuoka
- JST ERATO, Lipid Active
Structure Project, ‡Department of Chemistry, Graduate
School of Science, and §Project Research Center for Fundamental Science, Osaka University, 1-1
Machikaneyama, Toyonaka, Osaka 560-0043, Japan
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10
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Tan MC, Matsuoka S, Ano H, Ishida H, Hirose M, Sato F, Sugiyama S, Murata M. Interaction kinetics of liposome-incorporated unsaturated fatty acids with fatty acid-binding protein 3 by surface plasmon resonance. Bioorg Med Chem 2014; 22:1804-8. [PMID: 24581547 DOI: 10.1016/j.bmc.2014.02.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2013] [Revised: 01/31/2014] [Accepted: 02/03/2014] [Indexed: 11/30/2022]
Abstract
The role of heart-type fatty acid-binding protein (FABP3) in human physiology as an intracellular carrier of fatty acids (FAs) has been well-documented. In this study, we aimed to develop an analytical method to study real-time interaction kinetics between FABP3 immobilized on the sensor surface and unsaturated C18 FAs using surface plasmon resonance (SPR). To establish the conditions for SPR experiments, we used an FABP3-selective inhibitor 4-(2-(1-(4-bromophenyl)-5-phenyl-1H-pyrazol-3-yl)-phenoxy)-butyric acid. The affinity index thus obtained was comparable to that reported previously, further supporting the usefulness of the SPR-based approach for evaluating interactions between FABPs and hydrophobic ligands. A pseudo-first-order affinity of FABP3 to K(+) petroselinate (C18:1 Δ6 cis), K(+) elaidate (C18:1 Δ9 trans), and K(+) oleate (C18:1 Δ9 cis) was characterized by the dissociation constant (K(d)) near micromolar ranges, whereas K(+) linoleate (C18:2 Δ9,12 cis/cis) and K(+) α-linolenate (C18:3 Δ9,12,15 cis/cis/cis) showed a higher affinity to FABP3 with Kd around 1 × 10(-6)M. Interactions between FAPB3 and C18 FAs incorporated in large unilamellar vesicles consisting of 1,2-dimyristoyl-sn-glycero-3-phosphocholine and FAs (5:1 molar ratio) were also analysed. Control DMPC liposomes without FA showed only marginal binding to FABP3 immobilized on a sensor chip while liposome-incorporated FA revealed significant responses in sensorgrams, demonstrating that the affinity of FAs to FABP3 could be evaluated by using the liposome-incorporated analytes. Significant affinity to FABP3 was observed for monounsaturated fatty acids (K(d) in the range of 1 × 10(-7)M). These experiments demonstrated that highly hydrophobic compounds in a liposome-incorporated form could be subjected to SPR experiments for kinetic analysis.
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Affiliation(s)
- Maria Carmen Tan
- JST ERATO, Lipid Active Structure Project, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan; Department of Chemistry, De La Salle University, 2401 Taft Avenue, Malate, Manila 1004, Philippines
| | - Shigeru Matsuoka
- JST ERATO, Lipid Active Structure Project, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan; Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan; Project Research Center for Fundamental Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
| | - Hikaru Ano
- JST ERATO, Lipid Active Structure Project, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan; Project Research Center for Fundamental Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
| | - Hanako Ishida
- JST ERATO, Lipid Active Structure Project, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
| | - Mika Hirose
- JST ERATO, Lipid Active Structure Project, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan; Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
| | - Fuminori Sato
- JST ERATO, Lipid Active Structure Project, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan; Project Research Center for Fundamental Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
| | - Shigeru Sugiyama
- JST ERATO, Lipid Active Structure Project, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan; Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
| | - Michio Murata
- JST ERATO, Lipid Active Structure Project, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan; Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan; Project Research Center for Fundamental Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan.
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11
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Kakoti A, Goswami P. Heart type fatty acid binding protein: structure, function and biosensing applications for early detection of myocardial infarction. Biosens Bioelectron 2013; 43:400-11. [PMID: 23357005 DOI: 10.1016/j.bios.2012.12.057] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2012] [Revised: 12/20/2012] [Accepted: 12/27/2012] [Indexed: 12/16/2022]
Abstract
Heart type fatty acid binding protein (HFABP) as an early marker of cardiac injury holds a promising future with studies indicating surpassing performance as compared to myoglobin. As a plasma marker, this cytoplasmic protein owing to its small size (∼15kDa) and water solubility, appears readily in the blood-stream following cardiomyocyte damage, reaching peak levels within 6h of symptom onset. Low plasma levels of HFABP as compared to tissue levels indicate that minute amounts of the protein when released during myocardial infarction leads to a greater proportional rise. These parameters of kinetic release make it an ideal candidate for rapid assessment of acute myocardial infarction (AMI). The need for development of rapid immunoassays and immunotests so as to use HFABP as an early marker for AMI exclusion is tremendous. In the present review, we outline the various immunoassays and immunosensors developed so far for the detection of HFABP in buffer, plasma or whole blood. The principles behind the detection techniques along with their performance parameters compared to standard ELISA techniques are elucidated.
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Affiliation(s)
- Ankana Kakoti
- Department of Biotechnology, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
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12
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Horváth G, Király P, Tárkányi G, Toke O. Internal Motions and Exchange Processes in Human Ileal Bile Acid Binding Protein As Studied by Backbone 15N Nuclear Magnetic Resonance Spectroscopy. Biochemistry 2012; 51:1848-61. [DOI: 10.1021/bi201588q] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Gergő Horváth
- Institute of Structural Chemistry, Chemical Research Center of the Hungarian Academy of Sciences, 59-67 Pusztaszeri út, Budapest, H-1025 Hungary
| | - Péter Király
- Institute of Structural Chemistry, Chemical Research Center of the Hungarian Academy of Sciences, 59-67 Pusztaszeri út, Budapest, H-1025 Hungary
| | - Gábor Tárkányi
- Institute of Structural Chemistry, Chemical Research Center of the Hungarian Academy of Sciences, 59-67 Pusztaszeri út, Budapest, H-1025 Hungary
| | - Orsolya Toke
- Institute of Structural Chemistry, Chemical Research Center of the Hungarian Academy of Sciences, 59-67 Pusztaszeri út, Budapest, H-1025 Hungary
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13
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Smathers RL, Petersen DR. The human fatty acid-binding protein family: evolutionary divergences and functions. Hum Genomics 2011; 5:170-91. [PMID: 21504868 PMCID: PMC3500171 DOI: 10.1186/1479-7364-5-3-170] [Citation(s) in RCA: 315] [Impact Index Per Article: 24.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Fatty acid-binding proteins (FABPs) are members of the intracellular lipid-binding protein (iLBP) family and are involved in reversibly binding intracellular hydrophobic ligands and trafficking them throughout cellular compartments, including the peroxisomes, mitochondria, endoplasmic reticulum and nucleus. FABPs are small, structurally conserved cytosolic proteins consisting of a water-filled, interior-binding pocket surrounded by ten anti-parallel beta sheets, forming a beta barrel. At the superior surface, two alpha-helices cap the pocket and are thought to regulate binding. FABPs have broad specificity, including the ability to bind long-chain (C16-C20) fatty acids, eicosanoids, bile salts and peroxisome proliferators. FABPs demonstrate strong evolutionary conservation and are present in a spectrum of species including Drosophila melanogaster, Caenorhabditis elegans, mouse and human. The human genome consists of nine putatively functional protein-coding FABP genes. The most recently identified family member, FABP12, has been less studied.
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Affiliation(s)
- Rebecca L Smathers
- Molecular Toxicology and Environmental Health Sciences Program, Department of Pharmaceutical Sciences, University of Colorado Denver, Aurora, CO 80045, USA
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14
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Abstract
The intracellular fatty acid-binding proteins (FABPs) are abundantly expressed in almost all tissues. They exhibit high affinity binding of a single long-chain fatty acid, with the exception of liver FABP, which binds two fatty acids or other hydrophobic molecules. FABPs have highly similar tertiary structures consisting of a 10-stranded antiparallel β-barrel and an N-terminal helix-turn-helix motif. Research emerging in the last decade has suggested that FABPs have tissue-specific functions that reflect tissue-specific aspects of lipid and fatty acid metabolism. Proposed roles for FABPs include assimilation of dietary lipids in the intestine, targeting of liver lipids to catabolic and anabolic pathways, regulation of lipid storage and lipid-mediated gene expression in adipose tissue and macrophages, fatty acid targeting to β-oxidation pathways in muscle, and maintenance of phospholipid membranes in neural tissues. The regulation of these diverse processes is accompanied by the expression of different and sometimes multiple FABPs in these tissues and may be driven by protein-protein and protein-membrane interactions.
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Affiliation(s)
- Judith Storch
- From the Department of Nutritional Sciences and the Rutgers Center for Lipid Research, Rutgers University, New Brunswick, New Jersey 08901.
| | - Alfred E Thumser
- Division of Biochemical Sciences, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom.
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15
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Wang Q, Guan T, Li H, Bernlohr DA. A novel polymorphism in the chicken adipocyte fatty acid-binding protein gene (FABP4) that alters ligand-binding and correlates with fatness. Comp Biochem Physiol B Biochem Mol Biol 2009; 154:298-302. [PMID: 19595785 DOI: 10.1016/j.cbpb.2009.07.002] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2009] [Revised: 06/30/2009] [Accepted: 07/06/2009] [Indexed: 12/20/2022]
Abstract
Similar to the mammalian FABP4 gene, the chicken (Gallus gallus) FABP4 gene consists of four exons separated by three introns and encodes a 132 amino acid protein termed the adipocyte fatty acid-binding protein (AFABP). In the current study, a novel G/A polymorphism in exon 3 of the chicken FABP4 gene was identified associated with different chicken breeds that leads to either Ser or Asn at amino acid 89 of the AFABP protein. The Baier chicken averages 0.89+/-0.12% abdominal fat and expresses the G allele (Ser 89 isoform) while the Broiler chicken typically has 3.74+/-0.23% abdominal fat and expresses the A allele (Asn 89 isoforms). cDNAs corresponding to the two AFABP isoforms were cloned and expressed in Escherichia coli as GST fusions, purified by using glutathione sepharose 4B chromatography and evaluated for lipid binding using the fluorescent surrogate ligand 1-anilinonaphthalene 8-sulphonic acid (1,8-ANS). The results showed that AFABP Ser89 exhibited a lower ligand-binding affinity with apparent dissociation constants (Kd) of 7.31+/-3.75 microM, while the AFABP Asn89 isoform bound 1,8-ANS with an apparent dissociation constant of 2.99+/-1.00 microM (P=0.02). These results suggest that the Ser89Asn polymorphism may influence chicken AFABP function and ultimately lipid deposition through changing the ligand-binding activity of AFABP.
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Affiliation(s)
- Qigui Wang
- College of Animal Science and Technology, Northeast Agricultural University, Harbin 150030, PR China
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16
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Storch J, Corsico B. The emerging functions and mechanisms of mammalian fatty acid-binding proteins. Annu Rev Nutr 2008; 28:73-95. [PMID: 18435590 DOI: 10.1146/annurev.nutr.27.061406.093710] [Citation(s) in RCA: 314] [Impact Index Per Article: 19.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Fatty acid-binding proteins (FABPs) are abundant intracellular proteins that bind long-chain fatty acids with high affinity. Nine separate mammalian FABPs have been identified, and their tertiary structures are highly conserved. The FABPs have unique tissue-specific distributions that have long suggested functional differences among them. In the last decade, considerable progress has been made in understanding the specific functions of the FABPs and, in some cases, their mechanisms of action at the molecular level. The FABPs appear to be involved in the extranuclear compartments of the cell by trafficking their ligands within the cytosol via interactions with organelle membranes and specific proteins. Several members of the FABP family have been shown to function directly in the regulation of cognate nuclear transcription factor activity via ligand-dependent translocation to the nucleus. This review will focus on these emerging functions and mechanisms of the FABPs, highlighting the unique functional properties of each as well as the similarities among them.
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Affiliation(s)
- Judith Storch
- Department of Nutritional Sciences and the Rutgers Center for Lipid Research, School of Environmental and Biological Sciences, Rutgers University, New Brunswick, New Jersey 08901, USA.
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17
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Franchini GR, Storch J, Corsico B. The integrity of the alpha-helical domain of intestinal fatty acid binding protein is essential for the collision-mediated transfer of fatty acids to phospholipid membranes. Biochim Biophys Acta Mol Cell Biol Lipids 2008; 1781:192-9. [PMID: 18284926 DOI: 10.1016/j.bbalip.2008.01.005] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2007] [Revised: 12/26/2007] [Accepted: 01/14/2008] [Indexed: 01/03/2023]
Abstract
Intestinal FABP (IFABP) and liver FABP (LFABP), homologous proteins expressed at high levels in intestinal absorptive cells, employ markedly different mechanisms of fatty acid transfer to acceptor model membranes. Transfer from IFABP occurs during protein-membrane collisional interactions, while for LFABP transfer occurs by diffusion through the aqueous phase. In addition, transfer from IFABP is markedly faster than from LFABP. The overall goal of this study was to further explore the structural differences between IFABP and LFABP which underlie their large functional differences in ligand transport. In particular, we addressed the role of the alphaI-helix domain in the unique transport properties of intestinal FABP. A chimeric protein was engineered with the 'body' (ligand binding domain) of IFABP and the alphaI-helix of LFABP (alpha(I)LbetaIFABP), and the fatty acid transfer properties of the chimeric FABP were examined using a fluorescence resonance energy transfer assay. The results showed a significant decrease in the absolute rate of FA transfer from alpha(I)LbetaIFABP compared to IFABP. The results indicate that the alphaI-helix is crucial for IFABP collisional FA transfer, and further indicate the participation of the alphaII-helix in the formation of a protein-membrane "collisional complex". Photo-crosslinking experiments with a photoactivable reagent demonstrated the direct interaction of IFABP with membranes and further support the importance of the alphaI helix of IFABP in its physical interaction with membranes.
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Affiliation(s)
- G R Franchini
- Instituto de Investigaciones Bioquímicas de La Plata, CONICET-UNLP, Facultad de Ciencias Médicas, calles 60 y 120, 1900-La Plata, Argentina
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18
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Mihajlovic M, Lazaridis T. Modeling fatty acid delivery from intestinal fatty acid binding protein to a membrane. Protein Sci 2007; 16:2042-55. [PMID: 17660261 PMCID: PMC2206986 DOI: 10.1110/ps.072875307] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Intestinal fatty acid binding protein (IFABP) interacts with biological membranes and delivers fatty acid (FA) into them via a collisional mechanism. However, the membrane-bound structure of the protein and the pathway of FA transfer are not precisely known. We used molecular dynamics (MD) simulations with an implicit membrane model to determine the optimal orientation of apo- and holo-IFABP (bound with palmitate) on an anionic membrane. In this orientation, the helical portal region, delimited by the alphaII helix and the betaC-betaD and betaE-betaF turns, is oriented toward the membrane whereas the putative beta-strand portal, delimited by the betaB-betaC, betaF-betaG, betaH-betaI turns and the N terminus, is exposed to solvent. Starting from the MD structure of holo-IFABP in the optimal orientation relative to the membrane, we examined the release of palmitate via both pathways. Although the domains can widen enough to allow the passage of palmitate, fatty acid release through the helical portal region incurs smaller conformational changes and a lower energetic cost.
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Affiliation(s)
- Maja Mihajlovic
- Department of Chemistry, City College of New York/CUNY, New York, New York 10031, USA
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19
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Marcelino AMC, Smock RG, Gierasch LM. Evolutionary coupling of structural and functional sequence information in the intracellular lipid-binding protein family. Proteins 2007; 63:373-84. [PMID: 16477649 DOI: 10.1002/prot.20860] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
We have mined the evolutionary record for the large family of intracellular lipid-binding proteins (iLBPs) by calculating the statistical coupling of residue variations in a multiple sequence alignment using methods developed by Ranganathan and coworkers (Lockless and Ranganathan, Science 1999:286;295-299). The 213 sequences analyzed have a wide range of ligand-binding functions as well as highly divergent phylogenetic origins, assuring broad sampling of sequence space. Emerging from this analysis were two major clusters of coupled residues, which when mapped onto the structure of a representative iLBP under study in our laboratory, cellular retinoic-acid binding protein I, are largely contiguous and provide useful points of comparison to available data for the folding of this protein. One cluster comprises a predominantly hydrophobic core away from the ligand-binding site and likely represents key structural information for the iLBP fold. The other cluster includes the portal region where ligand enters its binding site, regions of the ligand-binding cavity, and the region where the 10-stranded beta-barrel characteristic of this family closes (between strands 1' and 10). Linkages between these two clusters suggest that evolutionary pressures on this family constrain structural and functional sequence information in an interdependent fashion. The necessity of the structure to wrap around a hydrophobic ligand confounds the typical sequestration of hydrophobic side chains. Additionally, ligand entry and exit require these structures to have a capacity for specific conformational change during binding and release. We conclude that an essential and structurally apparent separation of local and global sequence information is conserved throughout the iLBP family.
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20
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Falomir-Lockhart LJ, Laborde L, Kahn PC, Storch J, Córsico B. Protein-membrane interaction and fatty acid transfer from intestinal fatty acid-binding protein to membranes. Support for a multistep process. J Biol Chem 2006; 281:13979-89. [PMID: 16551626 DOI: 10.1074/jbc.m511943200] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Fatty acid transfer from intestinal fatty acid-binding protein (IFABP) to phospholipid membranes occurs during protein-membrane collisions. Electrostatic interactions involving the alpha-helical "portal" region of the protein have been shown to be of great importance. In the present study, the role of specific lysine residues in the alpha-helical region of IFABP was directly examined. A series of point mutants in rat IFABP was engineered in which the lysine positive charges in this domain were eliminated or reversed. Using a fluorescence resonance energy transfer assay, we analyzed the rates and mechanism of fatty acid transfer from wild type and mutant proteins to acceptor membranes. Most of the alpha-helical domain mutants showed slower absolute fatty acid transfer rates to zwitterionic membranes, with substitution of one of the lysines of the alpha2 helix, Lys27, resulting in a particularly dramatic decrease in the fatty acid transfer rate. Sensitivity to negatively charged phospholipid membranes was also reduced, with charge reversal mutants in the alpha2 helix the most affected. The results support the hypothesis that the portal region undergoes a conformational change during protein-membrane interaction, which leads to release of the bound fatty acid to the membrane and that the alpha2 segment is of particular importance in the establishment of charge-charge interactions between IFABP and membranes. Cross-linking experiments with a phospholipid-photoactivable reagent underscored the importance of charge-charge interactions, showing that the physical interaction between wild-type intestinal fatty acid-binding protein and phospholipid membranes is enhanced by electrostatic interactions. Protein-membrane interactions were also found to be enhanced by the presence of ligand, suggesting different collisional complex structures for holo- and apo-IFABP.
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Affiliation(s)
- Lisandro J Falomir-Lockhart
- Instituto de Investigaciones Bioquímicas de La Plata, CONICET-UNLP, Facultad de Ciencias Médicas, Calles 60 y 120, 1900-La Plata, Argentina
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21
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Chmurzyńska A. The multigene family of fatty acid-binding proteins (FABPs): function, structure and polymorphism. J Appl Genet 2006; 47:39-48. [PMID: 16424607 DOI: 10.1007/bf03194597] [Citation(s) in RCA: 471] [Impact Index Per Article: 26.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/04/2023]
Abstract
Fatty acid-binding proteins (FABPs) are members of the superfamily of lipid-binding proteins (LBP). So far 9 different FABPs, with tissue-specific distribution, have been identified: L (liver), I (intestinal), H (muscle and heart), A (adipocyte), E (epidermal), Il (ileal), B (brain), M (myelin) and T (testis). The primary role of all the FABP family members is regulation of fatty acid uptake and intracellular transport. The structure of all FABPs is similar - the basic motif characterizing these proteins is beta-barrel, and a single ligand (e.g. a fatty acid, cholesterol, or retinoid) is bound in its internal water-filled cavity. Despite the wide variance in the protein sequence, the gene structure is identical. The FABP genes consist of 4 exons and 3 introns and a few of them are located in the same chromosomal region. For example, A-FABP, E-FABP and M-FABP create a gene cluster. Because of their physiological properties some FABP genes were tested in order to identify mutations altering lipid metabolism. Furthermore, the porcine A-FABP and H-FABP were studied as candidate genes with major effect on fatness traits.
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Affiliation(s)
- Agata Chmurzyńska
- Department of Animal Genetics and Breeding, August Cieszkowski Agricultural University of Poznan, Wolynska 33, Poznan 60-637, Poland
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22
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Glatz JFC, Schaap FG, Binas B, Bonen A, van der Vusse GJ, Luiken JJFP. Cytoplasmic fatty acid-binding protein facilitates fatty acid utilization by skeletal muscle. ACTA PHYSIOLOGICA SCANDINAVICA 2003; 178:367-71. [PMID: 12864741 DOI: 10.1046/j.1365-201x.2003.01166.x] [Citation(s) in RCA: 98] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The intracellular transport of long-chain fatty acids in muscle cells is facilitated to a great extent by heart-type cytoplasmic fatty acid-binding protein (H-FABP). By virtue of the marked affinity of this 14.5-kDa protein for fatty acids, H-FABP dramatically increases their concentration in the aqueous cytoplasm by non-covalent binding, thereby facilitating both the transition of fatty acids from membranes to the aqueous space and their diffusional transport from membranes (e.g. sarcolemma) to other cellular compartments (e.g. mitochondria). Striking features are the relative abundance of H-FABP in muscle, especially in oxidative muscle fibres, and the modulation of the muscular H-FABP content in concert with the modulation of other proteins and enzymes involved in fatty acid handling and utilization. Newer studies with mice carrying a homozygous or heterozygous deletion of the H-FABP gene show that, in comparison with wild-type mice, hindlimb muscles from heterozygous animals have a markedly lowered (-66%) H-FABP content but unaltered palmitate uptake rate, while in hindlimb muscles from homozygous animals (no H-FABP present) palmitate uptake was reduced by 45%. These findings indicate that H-FABP is present in relative excess and plays a substantial, but merely permissive role in fatty acid uptake by skeletal muscles.
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Affiliation(s)
- J F C Glatz
- Department of Physiology, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University, MD Maastricht, The Netherlands
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23
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Lu J, Cistola DP, Li E. Two homologous rat cellular retinol-binding proteins differ in local conformational flexibility. J Mol Biol 2003; 330:799-812. [PMID: 12850148 DOI: 10.1016/s0022-2836(03)00629-6] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Cellular retinol-binding protein I (CRBP I) and cellular retinol-binding protein II (CRBP II) are closely homologous proteins that play distinct roles in the maintenance of vitamin A homeostasis. The solution structure and dynamics of CRBP I and CRBP II were compared by multidimensional NMR techniques. These studies indicated that differences in the mean backbone structures of CRBP I and CRBP II were localized primarily to the alphaII helix. Intraligand NOE cross-peaks were detected for the hydroxyl proton in the NOESY spectrum of CRBP I-bound retinol, but not for CRBP II-bound retinol, indicating that the conformational dynamics of retinol binding are different for these two proteins. As determined by Lipari-Szabo formalism, both the apo and holo forms of CRBP I and CRBP II are conformationally rigid on the pico- to nanosecond timescale. transverse relaxation optimized spectroscopy-Carr-Purcell-Meiboom-Gill -based 15N relaxation dispersion experiments at both 500 MHz and 600 MHz magnetic fields revealed that 84 and 62 residues for apo-CRBP I and II, respectively, showed detectable conformational exchange on a micro- to millisecond timescale, in contrast to three and seven residues for holo-CRBP I and II, respectively. Thus binding of retinol markedly reduced conformational flexibility in both CRBP I and CRBP II on the micro- to millisecond timescale. The 15N relaxation dispersion curves of apo-CRBP I and II were fit to a two-state conformational exchange model by a global iterative fitting process and by an individual (residue) fitting process. In the process of carrying out the global fit, more than half of the residue sites were eliminated. The individual chemical exchange rates k(ex), and chemical shift differences, Deltadelta, were increased in the putative portal region (alphaII helix and betaC-betaD turn) of apo-CRBP II compared to apo-CRBP I. These differences in conformational flexibility likely contribute to differences in how CRBP I and CRBP II interact with ligands, membranes and retinoid metabolizing enzymes.
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Affiliation(s)
- Jianyun Lu
- Department of Internal Medicine, Washington University School of Medicine, St. Louis, MO 63110, USA
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