51
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Endapally S, Frias D, Grzemska M, Gay A, Tomchick DR, Radhakrishnan A. Molecular Discrimination between Two Conformations of Sphingomyelin in Plasma Membranes. Cell 2019; 176:1040-1053.e17. [PMID: 30712872 DOI: 10.1016/j.cell.2018.12.042] [Citation(s) in RCA: 92] [Impact Index Per Article: 18.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2018] [Revised: 09/19/2018] [Accepted: 12/21/2018] [Indexed: 12/14/2022]
Abstract
Sphingomyelin and cholesterol are essential lipids that are enriched in plasma membranes of animal cells, where they interact to regulate membrane properties and many intracellular signaling processes. Despite intense study, the interaction between these lipids in membranes is not well understood. Here, structural and biochemical analyses of ostreolysin A (OlyA), a protein that binds to membranes only when they contain both sphingomyelin and cholesterol, reveal that sphingomyelin adopts two distinct conformations in membranes when cholesterol is present. One conformation, bound by OlyA, is induced by stoichiometric, exothermic interactions with cholesterol, properties that are consistent with sphingomyelin/cholesterol complexes. In its second conformation, sphingomyelin is free from cholesterol and does not bind OlyA. A point mutation abolishes OlyA's ability to discriminate between these two conformations. In cells, levels of sphingomyelin/cholesterol complexes are held constant over a wide range of plasma membrane cholesterol concentrations, enabling precise regulation of the chemical activity of cholesterol.
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Affiliation(s)
- Shreya Endapally
- Department of Molecular Genetics, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Donna Frias
- Department of Molecular Genetics, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Magdalena Grzemska
- Department of Biophysics, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Austin Gay
- Department of Molecular Genetics, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Diana R Tomchick
- Department of Biophysics, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Arun Radhakrishnan
- Department of Molecular Genetics, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.
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52
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Gudde LR, Hulce M, Largen AH, Franke JD. Sterol synthesis is essential for viability in the planctomycete bacterium Gemmata obscuriglobus. FEMS Microbiol Lett 2019; 366:5304612. [DOI: 10.1093/femsle/fnz019] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2018] [Accepted: 01/29/2019] [Indexed: 12/11/2022] Open
Affiliation(s)
- Luke R Gudde
- Department of Biology, Creighton University, Hixson-Leid Science Building Room 403, 2500 California Plaza, Omaha, NE 68178, USA
| | - Martin Hulce
- Department of Chemistry, Creighton University, 2500 California Plaza, Omaha, NE 68178, USA
| | - Alexander H Largen
- Department of Biology, Creighton University, Hixson-Leid Science Building Room 403, 2500 California Plaza, Omaha, NE 68178, USA
| | - Josef D Franke
- Department of Biology, Creighton University, Hixson-Leid Science Building Room 403, 2500 California Plaza, Omaha, NE 68178, USA
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53
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Metabolism and Biological Activities of 4-Methyl-Sterols. Molecules 2019; 24:molecules24030451. [PMID: 30691248 PMCID: PMC6385002 DOI: 10.3390/molecules24030451] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2018] [Revised: 01/19/2019] [Accepted: 01/23/2019] [Indexed: 12/12/2022] Open
Abstract
4,4-Dimethylsterols and 4-methylsterols are sterol biosynthetic intermediates (C4-SBIs) acting as precursors of cholesterol, ergosterol, and phytosterols. Their accumulation caused by genetic lesions or biochemical inhibition causes severe cellular and developmental phenotypes in all organisms. Functional evidence supports their role as meiosis activators or as signaling molecules in mammals or plants. Oxygenated C4-SBIs like 4-carboxysterols act in major biological processes like auxin signaling in plants and immune system development in mammals. It is the purpose of this article to point out important milestones and significant advances in the understanding of the biogenesis and biological activities of C4-SBIs.
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54
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Osorio-Méndez JF, Cevallos AM. Discovery and Genetic Validation of Chemotherapeutic Targets for Chagas' Disease. Front Cell Infect Microbiol 2019; 8:439. [PMID: 30666299 PMCID: PMC6330712 DOI: 10.3389/fcimb.2018.00439] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2018] [Accepted: 12/10/2018] [Indexed: 01/06/2023] Open
Abstract
There is an urgent need to develop new treatments for Chagas' disease. To identify drug targets, it is important to understand the basic biology of Trypanosoma cruzi, in particular with respect to the biological pathways or proteins that are essential for its survival within the host. This review provides a streamlined approach for identifying drug targets using freely available chemogenetic databases and outlines the relevant characteristics of an ideal chemotherapeutic target. Among those are their essentiality, druggability, availability of structural information, and selectivity. At the moment only 16 genes have been found as essential by gene disruption in T. cruzi. At the TDR Targets database, a chemogenomics resource for neglected diseases, information about published structures for these genes was only found for three of these genes, and annotation of validated inhibitors was found in two. These inhibitors have activity against the parasitic stages present in the host. We then analyzed three of the pathways that are considered promising in the search for new targets: (1) Ergosterol biosynthesis, (2) Resistance to oxidative stress, (3) Synthesis of surface glycoconjugates. We have annotated all the genes that participate in them, identified those that are considered as druggable, and incorporated evidence from either Trypanosoma brucei, and Leishmania spp. that supports the hypothesis that these pathways are essential for T. cruzi survival.
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Affiliation(s)
- Juan Felipe Osorio-Méndez
- Laboratorio de Microbiología y Biología Molecular, Programa de Medicina, Corporación Universitaria Empresarial Alexander von Humboldt, Armenia, Colombia.,Grupo de Estudio en Parasitología Molecular, Centro de Investigaciones Biomédicas, Universidad del Quindío, Armenia, Colombia
| | - Ana María Cevallos
- Departamento de Biología Molecular y Biotecnología, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Mexico City, Mexico
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55
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Emmerstorfer-Augustin A, Wriessnegger T, Hirz M, Zellnig G, Pichler H. Membrane Protein Production in Yeast: Modification of Yeast Membranes for Human Membrane Protein Production. Methods Mol Biol 2019; 1923:265-285. [PMID: 30737745 DOI: 10.1007/978-1-4939-9024-5_12] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Approximately 30% of the genes in the human genome code for membrane proteins, and yet we know relatively little about these complex molecules. Therefore, the biochemical and structural characterization of this challenging class of proteins represents an important frontier in both fundamental research and advances in drug discovery. However, due to their unique physical properties and requirement for association with cellular membranes, expression in heterologous systems is often daunting. In this chapter we describe how to engineer the yeast Pichia pastoris to obtain humanized sterol compositions. By implementing some simple genetic engineering approaches, P. pastoris can be reprogrammed to mainly produce cholesterol instead of ergosterol. We show how to apply mass spectrometry to confirm the production of cholesterol instead of ergosterol and how we have further analyzed the strain by electron microscopy. Finally, we delineate how to apply and test the cholesterol-forming P. pastoris strain for functional expression of mammalian Na,K-ATPase α3β1 isoform. Na,K-ATPases have been shown to specifically interact with cholesterol and phospholipids, and, obviously, the presence of cholesterol instead of ergosterol was the key to stabilizing correct localization and activity of this ion transporter.
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Affiliation(s)
- Anita Emmerstorfer-Augustin
- Division of Biochemistry, Biophysics and Structural Biology, Department of Molecular and Cell Biology, University of California, Berkeley, CA, USA
| | | | - Melanie Hirz
- Institute of Molecular Biotechnology, Graz University of Technology, NAWI Graz, BioTechMed Graz, Graz, Austria
| | - Guenther Zellnig
- Institute of Plant Sciences, University of Graz, NAWI Graz, Graz, Austria
| | - Harald Pichler
- acib-Austrian Centre of Industrial Biotechnology, Graz, Austria. .,Institute of Molecular Biotechnology, Graz University of Technology, NAWI Graz, BioTechMed Graz, Graz, Austria.
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56
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Molugu TR, Brown MF. Cholesterol Effects on the Physical Properties of Lipid Membranes Viewed by Solid-state NMR Spectroscopy. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2019; 1115:99-133. [PMID: 30649757 DOI: 10.1007/978-3-030-04278-3_5] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
In this chapter, we review the physical properties of lipid/cholesterol mixtures involving studies of model membranes using solid-state NMR spectroscopy. The approach allows one to quantify the average membrane structure, fluctuations, and elastic deformation upon cholesterol interaction. Emphasis is placed on understanding the membrane structural deformation and emergent fluctuations at an atomistic level. Lineshape measurements using solid-state NMR spectroscopy give equilibrium structural properties, while relaxation time measurements study the molecular dynamics over a wide timescale range. The equilibrium properties of glycerophospholipids, sphingolipids, and their binary and tertiary mixtures with cholesterol are accessible. Nonideal mixing of cholesterol with other lipids explains the occurrence of liquid-ordered domains. The entropic loss upon addition of cholesterol to sphingolipids is less than for glycerophospholipids, and may drive formation of lipid rafts. The functional dependence of 2H NMR spin-lattice relaxation (R 1Z) rates on segmental order parameters (S CD) for lipid membranes is indicative of emergent viscoelastic properties. Addition of cholesterol shows stiffening of the bilayer relative to the pure lipids and this effect is diminished for lanosterol. Opposite influences of cholesterol and detergents on collective dynamics and elasticity at an atomistic scale can potentially affect lipid raft formation in cellular membranes.
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Affiliation(s)
- Trivikram R Molugu
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, AZ, USA
| | - Michael F Brown
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, AZ, USA. .,Department of Physics, University of Arizona, Tucson, AZ, USA.
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57
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A Critical Analysis of Molecular Mechanisms Underlying Membrane Cholesterol Sensitivity of GPCRs. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2019; 1115:21-52. [PMID: 30649754 DOI: 10.1007/978-3-030-04278-3_2] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
G protein-coupled receptors (GPCRs) are the largest and a diverse family of proteins involved in signal transduction across biological membranes. GPCRs mediate a wide range of physiological processes and have emerged as major targets for the development of novel drug candidates in all clinical areas. Since GPCRs are integral membrane proteins, regulation of their organization, dynamics, and function by membrane lipids, in particular membrane cholesterol, has emerged as an exciting area of research. Cholesterol sensitivity of GPCRs could be due to direct interaction of cholesterol with the receptor (specific effect). Alternately, GPCR function could be influenced by the effect of cholesterol on membrane physical properties (general effect). In this review, we critically analyze the specific and general mechanisms of the modulation of GPCR function by membrane cholesterol, taking examples from representative GPCRs. While evidence for both the proposed mechanisms exists, there appears to be no clear-cut distinction between these two mechanisms, and a combination of these mechanisms cannot be ruled out in many cases. We conclude that classifying the mechanism underlying cholesterol sensitivity of GPCR function merely into these two mutually exclusive classes could be somewhat arbitrary. A more holistic approach could be suitable for analyzing GPCR-cholesterol interaction.
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58
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Zhou W, Warrilow AGS, Thomas CD, Ramos E, Parker JE, Price CL, Vanderloop BH, Fisher PM, Loftis MD, Kelly DE, Kelly SL, Nes WD. Functional importance for developmental regulation of sterol biosynthesis in Acanthamoeba castellanii. Biochim Biophys Acta Mol Cell Biol Lipids 2018; 1863:1164-1178. [PMID: 30044954 PMCID: PMC6180906 DOI: 10.1016/j.bbalip.2018.07.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2018] [Revised: 06/26/2018] [Accepted: 07/20/2018] [Indexed: 02/07/2023]
Abstract
The sterol metabolome of Acanthamoeba castellanii (Ac) yielded 25 sterols. Substrate screening of cloned AcCYP51 revealed obtusifoliol as the natural substrate which converts to ∆8,14-sterol (<95%). The combination of [2H3-methyl]methionine incubation to intact cultures showing C28-ergosterol incorporates 2-2H atoms and C29-7-dehydroporiferasterol incorporates 5 2H-atoms, the natural distribution of sterols, CYP51 and previously published sterol methyltransferase (SMT) data indicate separate ∆24(28)- and ∆25(27)-olefin pathways to C28- and C29-sterol products from the protosterol cycloartenol. In cell-based culture, we observed a marked change in sterol compositions during the growth and encystment phases monitored microscopically and by trypan blue staining; trophozoites possess C28/C29-∆5,7-sterols, viable encysted cells (mature cyst) possess mostly C29-∆5-sterol and non-viable encysted cells possess C28/C29-∆5,7-sterols that turnover variably from stress to 6-methyl aromatic sterols associated with changed membrane fluidity affording lysis. An incompatible fit of steroidal aromatics in membranes was confirmed using the yeast sterol auxotroph GL7. Only viable cysts, including those treated with inhibitor, can excyst into trophozoites. 25-Azacycloartanol or voriconazole that target SMT and CYP51, respectively, are potent enzyme inhibitors in the nanomolar range against the cloned enzymes and amoeba cells. At minimum amoebicidal concentration of inhibitor amoeboid cells rapidly convert to encysted cells unable to excyst. The correlation between stage-specific sterol compositions and the physiological effects of ergosterol biosynthesis inhibitors suggests that amoeba fitness is controlled mainly by developmentally-regulated changes in the phytosterol B-ring; paired interference in the ∆5,7-sterol biosynthesis (to ∆5,7) - metabolism (to ∆5 or 6-methyl aromatic) congruence during cell proliferation and encystment could be a source of therapeutic intervention for Acanthamoeba infections.
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Affiliation(s)
- Wenxu Zhou
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, TX, United States of America
| | - Andrew G S Warrilow
- Center for Cytochrome P450 Biodiversity, Institute of Life Science, School of Medicine, Swansea University, Swansea, Wales, United Kingdom
| | - Crista D Thomas
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, TX, United States of America
| | - Emilio Ramos
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, TX, United States of America
| | - Josie E Parker
- Center for Cytochrome P450 Biodiversity, Institute of Life Science, School of Medicine, Swansea University, Swansea, Wales, United Kingdom
| | - Claire L Price
- Center for Cytochrome P450 Biodiversity, Institute of Life Science, School of Medicine, Swansea University, Swansea, Wales, United Kingdom
| | - Boden H Vanderloop
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, TX, United States of America
| | - Paxtyn M Fisher
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, TX, United States of America
| | - Michael D Loftis
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, TX, United States of America
| | - Diane E Kelly
- Center for Cytochrome P450 Biodiversity, Institute of Life Science, School of Medicine, Swansea University, Swansea, Wales, United Kingdom
| | - Steven L Kelly
- Center for Cytochrome P450 Biodiversity, Institute of Life Science, School of Medicine, Swansea University, Swansea, Wales, United Kingdom
| | - W David Nes
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, TX, United States of America.
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59
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Atkovska K, Klingler J, Oberwinkler J, Keller S, Hub JS. Rationalizing Steroid Interactions with Lipid Membranes: Conformations, Partitioning, and Kinetics. ACS CENTRAL SCIENCE 2018; 4:1155-1165. [PMID: 30276248 PMCID: PMC6161064 DOI: 10.1021/acscentsci.8b00332] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2018] [Indexed: 05/18/2023]
Abstract
Steroids have numerous physiological functions associated with cellular signaling or modulation of the lipid membrane structure and dynamics, and as such, they have found broad pharmacological applications. Steroid-membrane interactions are relevant to multiple steps of steroid biosynthesis and action, as steroids are known to interact with neurotransmitter or membrane steroid receptors, and steroids must cross lipid membranes to exert their physiological functions. Therefore, rationalizing steroid function requires understanding of steroid-membrane interactions. We combined molecular dynamics simulations and isothermal titration calorimetry to characterize the conformations and the energetics of partitioning, in addition to the kinetics of flip-flop transitions and membrane exit, of 26 representative steroid compounds in a model lipid membrane. The steroid classes covered in this study include birth control and anabolic drugs, sex and corticosteroid hormones, neuroactive steroids, as well as steroids modulating the lipid membrane structure. We found that the conformational ensembles adopted by different steroids vary greatly, as quantified by their distributions of tilt angles and insertion depths into the membrane, ranging from well-defined steroid conformations with orientations either parallel or normal to the membrane, to wide conformational distributions. Surprisingly, despite their chemical diversity, the membrane/water partition coefficient is similar among most steroids, except for structural steroids such as cholesterol, leading to similar rates for exiting the membrane. By contrast, the rates of steroid flip-flop vary by at least 9 orders of magnitude, revealing that flip-flop is the rate-limiting step during cellular uptake of polar steroids. This study lays the ground for a quantitative understanding of steroid-membrane interactions, and it will hence be of use for studies of steroid biosynthesis and function as well as for the development and usage of steroids in a pharmacological context.
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Affiliation(s)
- Kalina Atkovska
- Institute
for Microbiology and Genetics and Goettingen Center for Molecular
Biosciences, University of Goettingen, 37077 Göttingen, Germany
| | - Johannes Klingler
- Molecular
Biophysics, Technische Universität
Kaiserslautern (TUK), 67663 Kaiserslautern, Germany
| | - Johannes Oberwinkler
- Institut
für Physiologie und Pathophysiologie, Philipps-Universität Marburg, 35037 Marburg, Germany
| | - Sandro Keller
- Molecular
Biophysics, Technische Universität
Kaiserslautern (TUK), 67663 Kaiserslautern, Germany
| | - Jochen S. Hub
- Institute
for Microbiology and Genetics and Goettingen Center for Molecular
Biosciences, University of Goettingen, 37077 Göttingen, Germany
- Theoretical
Physics, Saarland University, 66123 Saarbrücken, Germany
- E-mail:
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60
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Pichler H, Emmerstorfer-Augustin A. Modification of membrane lipid compositions in single-celled organisms – From basics to applications. Methods 2018; 147:50-65. [DOI: 10.1016/j.ymeth.2018.06.009] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2018] [Revised: 05/18/2018] [Accepted: 06/16/2018] [Indexed: 12/12/2022] Open
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61
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A rearranged seco-steroid with new skeleton and five new abnormal progesteroids from Nodulisporium sp. Tetrahedron 2018. [DOI: 10.1016/j.tet.2018.08.011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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62
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Girotti AW, Korytowski W. Cholesterol Peroxidation as a Special Type of Lipid Oxidation in Photodynamic Systems. Photochem Photobiol 2018; 95:73-82. [PMID: 29962109 DOI: 10.1111/php.12969] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2018] [Accepted: 06/15/2018] [Indexed: 02/06/2023]
Abstract
Like other unsaturated lipids in cell membranes and lipoproteins, cholesterol (Ch) is susceptible to oxidative modification, including photodynamic oxidation. There is a sustained interest in the pathogenic properties of Ch oxides such as those generated by photooxidation. Singlet oxygen (1 O2 )-mediated Ch photooxidation (Type II mechanism) gives rise to three hydroperoxide (ChOOH) isomers: 5α-OOH, 6α-OOH and 6β-OOH, the 5α-OOH yield far exceeding that of the others. 5α-OOH detection is relatively straightforward and serves as a definitive indicator of 1 O2 involvement in a reaction, photochemical or otherwise. Like all lipid hydroperoxides (LOOHs), ChOOHs can disrupt membrane or lipoprotein structure/function on their own, but subsequent light-independent reactions may either intensify or attenuate such effects. Such reactions include (1) one-electron reduction to redox-active free radical intermediates, (2) two-electron reduction to redox-silent alcohols and (3) translocation to other lipid compartments, where (1) or (2) may take place. In addition to these effects, ChOOHs may act as signaling molecules in reactions that affect cell fates. Although processes a-c have been well studied for ChOOHs, signaling activity is still poorly understood compared with that of hydrogen peroxide. This review focuses on these various aspects Ch photoperoxidation and its biological consequences.
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Affiliation(s)
- Albert W Girotti
- Department of Biochemistry, Medical College of Wisconsin, Milwaukee, WI
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63
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Steck TL, Lange Y. Transverse distribution of plasma membrane bilayer cholesterol: Picking sides. Traffic 2018; 19:750-760. [PMID: 29896788 DOI: 10.1111/tra.12586] [Citation(s) in RCA: 88] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2018] [Revised: 06/04/2018] [Accepted: 06/05/2018] [Indexed: 12/23/2022]
Abstract
The transverse asymmetry (sidedness) of phospholipids in plasma membrane bilayers is well characterized, distinctive, actively maintained and functionally important. In contrast, numerous studies using a variety of techniques have concluded that plasma membrane bilayer cholesterol is either mostly in the outer leaflet or the inner leaflet or is fairly evenly distributed. Sterols might simply partition according to their differing affinities for the asymmetrically disposed phospholipids, but some studies have proposed that it is actively transported to the outer leaflet. Other work suggests that the sterol is enriched in the inner leaflet, driven by either positive interactions with the phosphatidylethanolamine on that side or by its exclusion from the outer leaflet by the long chain sphingomyelin molecules therein. This uncertainty raises three questions: is plasma membrane cholesterol sidedness fixed in a given cell or cell type; is it generally the same among mammalian species; and does it serve specific physiological functions? This review grapples with these issues.
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Affiliation(s)
- Theodore L Steck
- Department of Biochemistry and Molecular Biology, University of Chicago, Chicago, Illinois
| | - Yvonne Lange
- Department of Pathology, Rush University Medical Center, Chicago, Illinois
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64
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Fuentes NR, Kim E, Fan YY, Chapkin RS. Omega-3 fatty acids, membrane remodeling and cancer prevention. Mol Aspects Med 2018; 64:79-91. [PMID: 29627343 DOI: 10.1016/j.mam.2018.04.001] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2017] [Revised: 03/27/2018] [Accepted: 04/04/2018] [Indexed: 12/20/2022]
Abstract
Proteins are often credited as the macromolecule responsible for performing critical cellular functions, however lipids have recently garnered more attention as our understanding of their role in cell function and human health becomes more apparent. Although cellular membranes are the lipid environment in which many proteins function, it is now apparent that protein and lipid assemblies can be organized to form distinct micro- or nanodomains that facilitate signaling events. Indeed, it is now appreciated that cellular function is partly regulated by the specific spatiotemporal lipid composition of the membrane, down to the nanosecond and nanometer scale. Furthermore, membrane composition is altered during human disease processes such as cancer and obesity. For example, an increased rate of lipid/cholesterol synthesis in cancerous tissues has long been recognized as an important aspect of the rewired metabolism of transformed cells. However, the contribution of lipids/cholesterol to cellular function in disease models is not yet fully understood. Furthermore, an important consideration in regard to human health is that diet is a major modulator of cell membrane composition. This can occur directly through incorporation of membrane substrates, such as fatty acids, e.g., n-3 polyunsaturated fatty acids (n-3 PUFA) and cholesterol. In this review, we describe scenarios in which changes in membrane composition impact human health. Particular focus is placed on the importance of intrinsic lipid/cholesterol biosynthesis and metabolism and extrinsic dietary modification in cancer and its effect on plasma membrane properties.
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Affiliation(s)
- Natividad R Fuentes
- Program in Integrative Nutrition & Complex Diseases, Texas A&M University, USA; Faculty of Toxicology, Texas A&M University, USA
| | - Eunjoo Kim
- Program in Integrative Nutrition & Complex Diseases, Texas A&M University, USA; Department of Molecular and Cellular Medicine, Texas A&M University, USA
| | - Yang-Yi Fan
- Program in Integrative Nutrition & Complex Diseases, Texas A&M University, USA; Department of Nutrition & Food Science, Texas A&M University, USA
| | - Robert S Chapkin
- Program in Integrative Nutrition & Complex Diseases, Texas A&M University, USA; Faculty of Toxicology, Texas A&M University, USA; Department of Nutrition & Food Science, Texas A&M University, USA; Center for Translational Environmental Health Research, Texas A&M University, USA.
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65
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Chen MY, Parfrey LW. Incubation with macroalgae induces large shifts in water column microbiota, but minor changes to the epibiota of co-occurring macroalgae. Mol Ecol 2018; 27:1966-1979. [PMID: 29524281 DOI: 10.1111/mec.14548] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2017] [Revised: 02/19/2018] [Accepted: 02/22/2018] [Indexed: 11/29/2022]
Abstract
Macroalgae variably promote and deter microbial growth through release of organic carbon and antimicrobial compounds into the water column. Consequently, macroalgae influence the microbial composition of the surrounding water column and biofilms on nearby surfaces. Here, we use manipulative experiments to test the hypotheses that (i) Nereocystis luetkeana and Mastocarpus sp. macroalgae alter the water column microbiota in species-specific manner, that (ii) neighbouring macroalgae alter the bacterial communities on the surface (epibiota) of actively growing Nereocystis luetkeana meristem fragments (NMFs), and that (iii) neighbours alter NMF growth rate. We also assess the impact of laboratory incubation on macroalgal epibiota by comparing each species to wild counterparts. We find strong differences between the Nereocystis and Mastocarpus epibiota that are maintained in the laboratory. Nereocystis and Mastocarpus alter water column bacterial community composition and richness in a species specific manner, but cause only small compositional shifts on NMF surfaces that do not differ by species, and do not change richness. Co-incubation with macroalgae results in significant change in abundance of fivefold more genera in the water column compared to NMF surfaces, although the direction (i.e., enrichment or reduction) of shift is generally consistent between the water and NMF surfaces. Finally, NMFs grew during the experiment, but growth did not depend on the presence or identity of neighbouring macroalgae. Thus, macroalgae exhibit a strong and species-specific influence on the water column microbiota, but a much weaker influence on the epibiota of neighbouring macroalgae. Overall, these results support the idea that macroalgae surfaces are highly selective and demonstrate that modulations of macroalgal microbiota operate within an overarching paradigm of host species specificity.
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Affiliation(s)
- Melissa Y Chen
- Botany Department and Biodiversity Research Centre, University of British Columbia, Vancouver, BC, Canada
| | - Laura Wegener Parfrey
- Botany and Zoology Departments and Biodiversity Research Centre, University of British Columbia, Vancouver, BC, Canada
- Hakai Institute, Hariot Bay, BC, Canada
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66
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Hernigou P, Auregan JC, Dubory A. Vitamin D: part I; from plankton and calcified skeletons (500 million years ago) to rickets. INTERNATIONAL ORTHOPAEDICS 2018; 42:2273-2285. [PMID: 29504055 DOI: 10.1007/s00264-018-3857-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2018] [Accepted: 02/18/2018] [Indexed: 02/06/2023]
Abstract
The vitamin D history started early in the evolution of life (billion years ago) as a photochemical reaction producing an inert molecule. During the early evolution of vertebrates, this molecule became essential for calcium and bone homeostasis of terrestrial animals and arrived to the status of hormone. Phytoplankton, zooplankton, and most plants and animals that are exposed to sunlight have the capacity to make vitamin D. Vitamin D is critically important for the development, growth, and maintenance of a healthy skeleton from birth until death. The major function of vitamin D is to maintain calcium homeostasis. It accomplishes this by increasing the efficiency of the intestine to absorb dietary calcium. When there is inadequate calcium in the diet to satisfy the body's calcium requirement, vitamin D communicates to the osteoblasts that signal osteoclast precursors to mature and dissolve the calcium stored in the bone. The typical "vitamin D-deficiency" disorder was observed for growing children in the west and south of England in the early 1600s. This disease was described by Glisson and named "rickets" (known also as "the English disease") and was observed with epidemic proportions in northern Europe and North America. The corrections of deformities of rickets were at the origin of the name "orthopedia" and of the technique of osteotomies.
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Bui Q, Sherma J, Hines JK. Using High Performance Thin Layer Chromatography-Densitometry to Study the Influence of the Prion [ RNQ+] and Its Determinant Prion Protein Rnq1 on Yeast Lipid Profiles. SEPARATIONS 2018; 5:6. [PMID: 30003084 PMCID: PMC6039194 DOI: 10.3390/separations5010006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
The baker's yeast Saccharomyces cerevisiae harbors multiple prions that allow for the creation of heterogeneity within otherwise clonal cell populations. However, in many cases, the consequences of prion infection are entirely unclear. Predictions of prion-induced changes in cell physiology are complicated by pleotropic effects, and detection is often limited to relatively insensitive cell growth assays that may obscure many physiological changes. We previously showed that silica gel high performance thin-layer chromatography-densitometry (HPTLC) can be used to empirically determine prion-induced changes in lipid content in yeast. Here, we conduct pair-wise quantifications of the relative levels of free sterols, free fatty acids, and triacylglycerols [petroleum ether-diethyl ether-glacial acetic acid (80:20:1, v/v/v) mobile phase and phosphomolybdic acid (PMA) detection reagent]; steryl esters, methyl esters, and squalene [hexane-petroleum ether-diethyl ether-glacial acetic acid (50:20:5:1, v/v/v/v) and PMA]; and phosphatidylethanolamine, phosphatidylcholine, and phosphatidylinositol (chloroform-diethyl ether-acetic acid (65:25:4.5, v/v/v) and cupric sulfate-phosphoric acid) in otherwise clonal prion-infected ([RNQ+]) and prion-free ([rnq-]) cells in both stationary- and logarithmic-growth phases. We detected multiple statistically significant differences between prion-infected and prion-free cells that varied by growth phase, confirming our pr evious observations that prions exert distinct influences on cell physiology between stationary- and log-phase growth. We also found significant differences between cells expressing or lacking the Rnq1 protein which forms the [RNQ+] prion, providing new clues to the as yet unresolved normal biological function of this prion-forming protein. This investigation further emphasizes the utility of HPTLC-densitometry to empirically determine the effects of prions and other presumed innocuous gene deletions on lipid content in yeast, and we expect that additional analyses will continue to resolve the physiological effects of prion infection.
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Affiliation(s)
- Quang Bui
- Department of Chemistry, Lafayette College, Easton, PA 18042, USA
| | - Joseph Sherma
- Department of Chemistry, Lafayette College, Easton, PA 18042, USA
| | - Justin K. Hines
- Department of Chemistry, Lafayette College, Easton, PA 18042, USA
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Loreto ES, Tondolo JSM, Oliveira DC, Santurio JM, Alves SH. In Vitro Activities of Miltefosine and Antibacterial Agents from the Macrolide, Oxazolidinone, and Pleuromutilin Classes against Pythium insidiosum and Pythium aphanidermatum. Antimicrob Agents Chemother 2018; 62:e01678-17. [PMID: 29311087 PMCID: PMC5826131 DOI: 10.1128/aac.01678-17] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2017] [Accepted: 01/05/2018] [Indexed: 12/20/2022] Open
Abstract
We tested 29 isolates of Pythium insidiosum and one isolate of Pythium aphanidermatum to investigate their susceptibility to miltefosine and antibacterial drugs from the macrolide, oxazolidinone, and pleuromutilin classes. We found that miltefosine, azithromycin, clarithromycin, josamycin, linezolid, sutezolid, retapamulin, tiamulin, and valnemulin had inhibitory and cidal activity against the pathogens at concentrations ranging from 0.25 to 64 μg/ml. Our results suggest that these antimicrobials are promising candidates for future studies on pythiosis in animals and humans.
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Affiliation(s)
- Erico S Loreto
- Programa de Pós-Graduação em Ciências Farmacêuticas, Centro de Ciências da Saúde, Departamento de Microbiologia e Parasitologia, Universidade Federal de Santa Maria (UFSM), Santa Maria, RS, Brazil
- Sobresp Faculdade de Ciências da Saúde, Santa Maria, RS, Brazil
| | - Juliana S M Tondolo
- Programa de Pós-Graduação em Farmacologia, Centro de Ciências da Saúde, Departamento de Microbiologia e Parasitologia, Universidade Federal de Santa Maria (UFSM), Santa Maria, RS, Brazil
| | | | - Janio M Santurio
- Programa de Pós-Graduação em Farmacologia, Centro de Ciências da Saúde, Departamento de Microbiologia e Parasitologia, Universidade Federal de Santa Maria (UFSM), Santa Maria, RS, Brazil
| | - Sydney H Alves
- Programa de Pós-Graduação em Ciências Farmacêuticas, Centro de Ciências da Saúde, Departamento de Microbiologia e Parasitologia, Universidade Federal de Santa Maria (UFSM), Santa Maria, RS, Brazil
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69
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Enhancement of ergosterol production by Saccharomyces cerevisiae in batch and fed-batch fermentation processes using n -dodecane as oxygen-vector. Biochem Eng J 2018. [DOI: 10.1016/j.bej.2017.12.010] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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70
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Abstract
Releasing sterols to the extracellular milieu is an important part of sterol homeostasis in cells and in the body. ATP-binding cassette transporter A1 (ABCA1) plays an essential role in cellular phospholipid and sterol release to lipid-free or lipid-poor apolipoprotein A-I (apoA-I), the major apolipoprotein in high-density lipoprotein (HDL), and constitutes the first step in the formation of nascent HDL. Loss-of-function mutations in the ABCA1 gene lead to a rare disease known as Tangier disease that causes severe deficiency in plasma HDL level. Mammalian cells receive exogenous cholesterol mainly from low-density lipoprotein. In addition, they synthesize cholesterol endogenously, as well as multiple precursor sterols that are sterol intermediates en route to be converted to cholesterol. HDL contains phospholipids, cholesterol, and precursor sterols, and ABCA1 has an ability to release phospholipids and various sterol molecules. Recent studies using model cell lines showed that ABCA1 prefers to use sterols newly synthesized endogenously as its preferred substrate, rather than cholesterol derived from LDL or cholesterol being recycled within the cells. Here, we describe several methods at the cell culture level to monitor ABCA1-dependent release of sterol molecules to apoA-I present at the cell exterior. Sterol release can be assessed by using a simple colorimetric enzymatic assay, and/or by monitoring the radioactivities of radiolabeled cholesterol incorporated into the cells, and/or of sterols biosynthesized from radioactive acetate, and/or by using gas chromatography-mass spectrometry analysis of various sterols present in medium and in cells. We also discuss the pros and cons of these methods. Together, these methods allow researchers to detect the release not only of cholesterol but also of other sterols present in minor quantities.
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Affiliation(s)
- Yoshio Yamauchi
- Department of Biochemistry II, Nagoya University Graduate School of Medicine, 65 Tsurumai, Showa-ku, Nagoya, 466-8550, Japan. .,Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-8657, Japan.
| | - Shinji Yokoyama
- Nutritional Health Science Research Center, and Department of Food and Nutritional Sciences, Chubu University, 1200 Matsumotocho, Kasugai, 487-8501, Japan
| | - Ta-Yuan Chang
- Department of Biochemistry, Geisel School of Medicine at Dartmouth, 7200 Vail Bldg. Room 304, Hanover, NH, 03755, USA.
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Fujiwara D, Tamai Y. Aeration Prior to Pitching Increases Intracellular Enzymatic and Transcriptional Responses under Nonnutritional Conditions. JOURNAL OF THE AMERICAN SOCIETY OF BREWING CHEMISTS 2018. [DOI: 10.1094/asbcj-61-0099] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Daisuke Fujiwara
- Central Laboratories for Key Technology, Kirin Brewery Co., Ltd., 1-13-5, Fukuura, Kanazawa, Yokohama-shi, Kanagawa, Japan
| | - Yukio Tamai
- Central Laboratories for Key Technology, Kirin Brewery Co., Ltd., 1-13-5, Fukuura, Kanazawa, Yokohama-shi, Kanagawa, Japan
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Morissette M, Morin N, Rouillard C, Di Paolo T. Membrane cholesterol removal and replenishment affect rat and monkey brain monoamine transporters. Neuropharmacology 2018; 133:289-306. [PMID: 29407218 DOI: 10.1016/j.neuropharm.2018.01.039] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2017] [Revised: 01/10/2018] [Accepted: 01/25/2018] [Indexed: 12/16/2022]
Abstract
The dopamine transporter (DAT) is abundantly expressed in the striatum where it removes extracellular dopamine into the cytosol of presynaptic nerve terminals. It is the target of drugs of abuse and antidepressants. There is a loss of the DAT in Parkinson's disease affecting release of levodopa implicated in levodopa-induced dyskinesias. This study investigated the effect of cholesterol on DAT, serotonin transporter (SERT) and vesicular monoamine transporter 2 (VMAT2) in monkey and rat brains in vitro. DAT protein levels measured by Western blot remained unchanged with in vitro methyl-β-cyclodextrin (MCD) incubations to remove membrane cholesterol or with incubations to increase membrane cholesterol content. By contrast, striatal DAT specific binding labelled with [125I]RTI-121 or with [125I]RTI-55 decreased with increasing concentrations of MCD and increased with cholesterol loading. Moreover, [125I]RTI-121 specific binding of striatal membranes depleted of cholesterol with MCD was restored to initial DAT content with addition of cholesterol showing its rapid and reversible effect. By contrast, striatal VMAT2 and SERT specific binding showed no or limited changes by cholesterol manipulations. Similar results were obtained for monkey caudate nucleus, putamen and nucleus accumbens. Membrane microviscosity was assessed by fluorescence polarization spectroscopy, using the probe 1,6-diphenyl-1,3,5-hexatriene. DAT changes positively correlated with changes of membrane microviscosity in rat and monkey brain regions investigated and with membrane cholesterol contents. Similar findings were observed with desmosterol but to a lower extent than with cholesterol. These results show an important effect of cholesterol on the DAT associated with microviscosity changes that should be considered in drug therapies.
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Affiliation(s)
- Marc Morissette
- Neuroscience Research Unit, Centre Hospitalier Universitaire de Québec, CHUL, Quebec City G1V 4G2, Canada
| | - Nicolas Morin
- Neuroscience Research Unit, Centre Hospitalier Universitaire de Québec, CHUL, Quebec City G1V 4G2, Canada; Faculty of Pharmacy, Université Laval, Quebec City G1K 7P4, Canada
| | - Claude Rouillard
- Neuroscience Research Unit, Centre Hospitalier Universitaire de Québec, CHUL, Quebec City G1V 4G2, Canada; Department of Psychiatry and Neuroscience, Faculty of Medicine, Université Laval, Quebec City G1K 7P4, Canada
| | - Thérèse Di Paolo
- Neuroscience Research Unit, Centre Hospitalier Universitaire de Québec, CHUL, Quebec City G1V 4G2, Canada; Faculty of Pharmacy, Université Laval, Quebec City G1K 7P4, Canada.
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Xie Y, Sen B, Wang G. Mining terpenoids production and biosynthetic pathway in thraustochytrids. BIORESOURCE TECHNOLOGY 2017; 244:1269-1280. [PMID: 28549813 DOI: 10.1016/j.biortech.2017.05.002] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2017] [Revised: 04/28/2017] [Accepted: 05/01/2017] [Indexed: 05/26/2023]
Abstract
Terpenoids are major bioactive compounds produced by microalgae and other eukaryotic microorganisms. Mining metabolic potential of marine microalgae for commercial production of terpenoids suggest thraustochytrids as one of the promising cell factories. The identification of potential thraustochytrid strains and relevant laboratory scale bioprocesses has been pursued largely. Further investigations in the improvement of terpenoids biosynthesis expect relevant molecular mechanisms to be understood directing metabolic engineering of the pathways. In this review, fermentative and mechanistic studies to identify key enzymes and pathways that are associated to terpenoids biosynthesis in thraustochytrids are discussed. Exploration of biosynthesis mechanisms in other model organisms facilitated identification of potential molecular targets for engineering terpenoids biosynthetic pathway in thraustochytrids. In addition, the preliminary genetic manipulation and in silico analysis in this review provides a platform for system-level metabolic engineering towards thraustochytrid strains improvement. Overall, the review contributes comprehensive information to allow better terpenoids productivity in thraustochytrids.
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Affiliation(s)
- Yunxuan Xie
- Center for Marine Environmental Ecology, School of Environmental Science & Engineering, Tianjin University, Tianjin 300072, China
| | - Biswarup Sen
- Center for Marine Environmental Ecology, School of Environmental Science & Engineering, Tianjin University, Tianjin 300072, China
| | - Guangyi Wang
- Center for Marine Environmental Ecology, School of Environmental Science & Engineering, Tianjin University, Tianjin 300072, China.
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Frisso G, Gelzo M, Procopio E, Sica C, Lenza MP, Dello Russo A, Donati MA, Salvatore F, Corso G. A rare case of sterol-C4-methyl oxidase deficiency in a young Italian male: Biochemical and molecular characterization. Mol Genet Metab 2017; 121:329-335. [PMID: 28673550 DOI: 10.1016/j.ymgme.2017.06.013] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/09/2017] [Revised: 06/23/2017] [Accepted: 06/26/2017] [Indexed: 12/28/2022]
Abstract
Inborn defects of cholesterol biosynthesis are metabolic disorders presenting with multi-organ and tissue anomalies. An autosomal recessive defect involving the demethylating enzyme C4-methyl sterol (SC4MOL) has been reported in only 4 patients so far. In infancy, all patients were affected by microcephaly, bilateral congenital cataracts, growth delay, psoriasiform dermatitis, immune dysfunction, and intellectual disability. Herein, we describe a new case of SC4MOL deficiency in which a 19-year-old Italian male was affected by bilateral congenital cataracts, growth delay and learning disabilities, behavioral disorders and small stature, but not microcephaly. Our patient had abundant scalp dandruff, without other skin manifestations. Analysis of the blood sterol profile showed accumulation of C4-monomethyl and C4-dimethyl sterols suggesting a deficiency of the SC4MOL enzyme. Sequencing of the MSMO1 gene (also known as the "SC4MOL" gene) confirmed mutations in each allele (c.731A>G, p.Y244C, which is already known, and c.605G>A, p.G202E, which is a novel variant). His father carried c.731A>G mutation, whereas his mother carried c.605G>A. Thus, the combination of multiple skills and methodologies, in particular, blood sterol profiling and genetic analysis, led to the diagnosis of a new case of a very rare defect of cholesterol biosynthesis. Consequently, we suggest that these two analyses should be performed as soon as possible in all undiagnosed patients affected by bilateral cataracts and developmental delay.
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Affiliation(s)
- Giulia Frisso
- Dipartimento di Medicina Molecolare e Biotecnologie Mediche, Università degli Studi di Napoli Federico II, Via Sergio Pansini 5, 80131 Napoli, Italy; CEINGE Biotecnologie Avanzate s.c.a r.l., Via Gaetano Salvatore 486, 80145 Napoli, Italy
| | - Monica Gelzo
- Dipartimento di Medicina Molecolare e Biotecnologie Mediche, Università degli Studi di Napoli Federico II, Via Sergio Pansini 5, 80131 Napoli, Italy
| | - Elena Procopio
- SOC Malattie Metaboliche e Muscolari Ereditarie, Centro di Eccellenza di Neuroscienze, Azienda Ospedaliero-Universitaria A. Meyer, Firenze, Italy
| | - Concetta Sica
- Dipartimento di Medicina Molecolare e Biotecnologie Mediche, Università degli Studi di Napoli Federico II, Via Sergio Pansini 5, 80131 Napoli, Italy
| | - Maria Pia Lenza
- Dipartimento di Medicina Molecolare e Biotecnologie Mediche, Università degli Studi di Napoli Federico II, Via Sergio Pansini 5, 80131 Napoli, Italy
| | - Antonio Dello Russo
- Dipartimento di Medicina Molecolare e Biotecnologie Mediche, Università degli Studi di Napoli Federico II, Via Sergio Pansini 5, 80131 Napoli, Italy
| | - Maria Alice Donati
- SOC Malattie Metaboliche e Muscolari Ereditarie, Centro di Eccellenza di Neuroscienze, Azienda Ospedaliero-Universitaria A. Meyer, Firenze, Italy
| | - Francesco Salvatore
- Dipartimento di Medicina Molecolare e Biotecnologie Mediche, Università degli Studi di Napoli Federico II, Via Sergio Pansini 5, 80131 Napoli, Italy; CEINGE Biotecnologie Avanzate s.c.a r.l., Via Gaetano Salvatore 486, 80145 Napoli, Italy.
| | - Gaetano Corso
- Dipartimento di Medicina Clinica e Sperimentale, Università degli Studi di Foggia, Viale L. Pinto 1, 71122 Foggia, Italy.
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Differential Membrane Dipolar Orientation Induced by Acute and Chronic Cholesterol Depletion. Sci Rep 2017; 7:4484. [PMID: 28667339 PMCID: PMC5493612 DOI: 10.1038/s41598-017-04769-4] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2017] [Accepted: 05/22/2017] [Indexed: 02/02/2023] Open
Abstract
Cholesterol plays a crucial role in cell membrane organization, dynamics and function. Depletion of cholesterol represents a popular approach to explore cholesterol-sensitivity of membrane proteins. An emerging body of literature shows that the consequence of membrane cholesterol depletion often depends on the actual process (acute or chronic), although the molecular mechanism underlying the difference is not clear. Acute depletion, using cyclodextrin-type carriers, is faster relative to chronic depletion, in which inhibitors of cholesterol biosynthesis are used. With the overall goal of addressing molecular differences underlying these processes, we monitored membrane dipole potential under conditions of acute and chronic cholesterol depletion in CHO-K1 cells, using a voltage-sensitive fluorescent dye in dual wavelength ratiometric mode. Our results show that the observed membrane dipole potential exhibits difference under acute and chronic cholesterol depletion conditions, even when cholesterol content was identical. To the best of our knowledge, these results provide, for the first time, molecular insight highlighting differences in dipolar reorganization in these processes. A comprehensive understanding of processes in which membrane cholesterol gets modulated would provide novel insight in its interaction with membrane proteins and receptors, thereby allowing us to understand the role of cholesterol in cellular physiology associated with health and disease.
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Pyne A, Kuchlyan J, Maiti C, Dhara D, Sarkar N. Cholesterol Based Surface Active Ionic Liquid That Can Form Microemulsions and Spontaneous Vesicles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:5891-5899. [PMID: 28514858 DOI: 10.1021/acs.langmuir.7b01158] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
In this article, we have reported the synthesis and physicochemical characterization of a novel l-glycine amino acid derived cholesterol based surface active ionic liquid (SAIL). This SAIL has been explored for the preparation of ionic liquid (IL)-in-oil microemulsions and vesicles. The formation of IL-in-oil microemulsion is characterized by construction of a ternary phase diagram, dynamic light scattering (DLS) measurement, proton nuclear magnetic resonance (1H NMR) study, fluorescence measurement using coumarin 480 (C-480) as a molecular probe, and also by recording the diffusion behavior of the molecular probe rhodamine 6G (R6G) in microemulsion droplets through the fluorescence correlation spectroscopy (FCS) technique. Similarly, the spontaneous vesicle formation from the SAIL in water has been established using DLS, transmission electron microscopy (TEM), cryogenic-transmission electron microscopy (cryo-TEM), field emission scanning electron microscopy (FESEM), atomic force microscopy (AFM), FCS, and fluorescence lifetime imaging microscopy (FLIM) measurements. These aggregates may potentially serve as good biomimicking models and possible drug carriers.
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Affiliation(s)
- Arghajit Pyne
- Department of Chemistry, Indian Institute of Technology , Kharagpur 721302, West Bengal, India
| | - Jagannath Kuchlyan
- Department of Chemistry, Indian Institute of Technology , Kharagpur 721302, West Bengal, India
| | - Chiranjit Maiti
- Department of Chemistry, Indian Institute of Technology , Kharagpur 721302, West Bengal, India
| | - Dibakar Dhara
- Department of Chemistry, Indian Institute of Technology , Kharagpur 721302, West Bengal, India
| | - Nilmoni Sarkar
- Department of Chemistry, Indian Institute of Technology , Kharagpur 721302, West Bengal, India
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Quest for steroidomimetics: Amino acids derived steroidal and nonsteroidal architectures. Eur J Med Chem 2017; 133:139-151. [DOI: 10.1016/j.ejmech.2017.03.054] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2016] [Revised: 03/21/2017] [Accepted: 03/24/2017] [Indexed: 11/18/2022]
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High Cholesterol/Low Cholesterol: Effects in Biological Membranes: A Review. Cell Biochem Biophys 2017; 75:369-385. [PMID: 28417231 DOI: 10.1007/s12013-017-0792-7] [Citation(s) in RCA: 185] [Impact Index Per Article: 26.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2017] [Accepted: 03/27/2017] [Indexed: 12/11/2022]
Abstract
Lipid composition determines membrane properties, and cholesterol plays a major role in this determination as it regulates membrane fluidity and permeability, as well as induces the formation of coexisting phases and domains in the membrane. Biological membranes display a very diverse lipid composition, the lateral organization of which plays a crucial role in regulating a variety of membrane functions. We hypothesize that, during biological evolution, membranes with a particular cholesterol content were selected to perform certain functions in the cells of eukaryotic organisms. In this review, we discuss the major membrane properties induced by cholesterol, and their relationship to certain membrane functions.
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79
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Valitova JN, Sulkarnayeva AG, Minibayeva FV. Plant Sterols: Diversity, Biosynthesis, and Physiological Functions. BIOCHEMISTRY (MOSCOW) 2017; 81:819-34. [PMID: 27677551 DOI: 10.1134/s0006297916080046] [Citation(s) in RCA: 96] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Sterols, which are isoprenoid derivatives, are structural components of biological membranes. Special attention is now being given not only to their structure and function, but also to their regulatory roles in plants. Plant sterols have diverse composition; they exist as free sterols, sterol esters with higher fatty acids, sterol glycosides, and acylsterol glycosides, which are absent in animal cells. This diversity of types of phytosterols determines a wide spectrum of functions they play in plant life. Sterols are precursors of a group of plant hormones, the brassinosteroids, which regulate plant growth and development. Furthermore, sterols participate in transmembrane signal transduction by forming lipid microdomains. The predominant sterols in plants are β-sitosterol, campesterol, and stigmasterol. These sterols differ in the presence of a methyl or an ethyl group in the side chain at the 24th carbon atom and are named methylsterols or ethylsterols, respectively. The balance between 24-methylsterols and 24-ethylsterols is specific for individual plant species. The present review focuses on the key stages of plant sterol biosynthesis that determine the ratios between the different types of sterols, and the crosstalk between the sterol and sphingolipid pathways. The main enzymes involved in plant sterol biosynthesis are 3-hydroxy-3-methylglutaryl-CoA reductase, C24-sterol methyltransferase, and C22-sterol desaturase. These enzymes are responsible for maintaining the optimal balance between sterols. Regulation of the ratios between the different types of sterols and sterols/sphingolipids can be of crucial importance in the responses of plants to stresses.
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Affiliation(s)
- J N Valitova
- Kazan Institute of Biochemistry and Biophysics, Russian Academy of Sciences, Kazan, 420111, Russia
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80
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Jafurulla M, Chattopadhyay A. Structural Stringency of Cholesterol for Membrane Protein Function Utilizing Stereoisomers as Novel Tools: A Review. Methods Mol Biol 2017; 1583:21-39. [PMID: 28205164 DOI: 10.1007/978-1-4939-6875-6_3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Cholesterol is an important lipid in the context of membrane protein function. The function of a number of membrane proteins, including G protein-coupled receptors (GPCRs) and ion channels, has been shown to be dependent on membrane cholesterol. However, the molecular mechanism underlying such regulation is still being explored. In some cases, specific interaction between cholesterol and the protein has been implicated. In other cases, the effect of cholesterol on the membrane properties has been attributed for the regulation of protein function. In this article, we have provided an overview of experimental approaches that are useful for determining the degree of structural stringency of cholesterol for membrane protein function. In the process, we have highlighted the role of immediate precursors in cholesterol biosynthetic pathway in the function of membrane proteins. Special emphasis has been given to the application of stereoisomers of cholesterol in deciphering the structural stringency required for regulation of membrane protein function. A comprehensive examination of these processes would help in understanding the molecular basis of cholesterol regulation of membrane proteins in subtle details.
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Affiliation(s)
- Md Jafurulla
- CSIR-Centre for Cellular and Molecular Biology, Uppal Road, Hyderabad, 500 007, India
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81
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Monteiro F, Bernal V, Chaillet M, Berger I, Alves PM. Targeted supplementation design for improved production and quality of enveloped viral particles in insect cell-baculovirus expression system. J Biotechnol 2016; 233:34-41. [DOI: 10.1016/j.jbiotec.2016.06.029] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2016] [Revised: 06/20/2016] [Accepted: 06/30/2016] [Indexed: 12/18/2022]
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82
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Papadopoulou MV, Bloomer WD, Rosenzweig HS, Wilkinson SR, Szular J, Kaiser M. Nitrotriazole-based acetamides and propanamides with broad spectrum antitrypanosomal activity. Eur J Med Chem 2016; 123:895-904. [PMID: 27543881 PMCID: PMC5049494 DOI: 10.1016/j.ejmech.2016.08.002] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Revised: 08/01/2016] [Accepted: 08/02/2016] [Indexed: 01/08/2023]
Abstract
3-Nitro-1H-1,2,4-triazole-based acetamides bearing a biphenyl- or a phenoxyphenyl moiety have shown remarkable antichagasic activity both in vitro and in an acute murine model, as well as substantial in vitro antileishmanial activity but lacked activity against human African trypanosomiasis. We have shown now that by inserting a methylene group in the linkage to obtain the corresponding propanamides, both antichagasic and in particular anti-human African trypanosomiasis potency was increased. Therefore, IC50 values at low nM concentrations against both T. cruzi and T. b. rhodesiense, along with huge selectivity indices were obtained. Although several propanamides were active against Leishmania donovani, they were slightly less potent than their corresponding acetamides. There was a good correlation between lipophilicity (clogP value) and trypanocidal activity, for all new compounds. Type I nitroreductase, an enzyme absent from the human host, played a role in the activation of the new compounds, which may function as prodrugs. Antichagasic activity in vivo was also demonstrated with representative propanamides.
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Affiliation(s)
| | | | | | - Shane R Wilkinson
- School of Biological & Chemical Sciences, Queen Mary University of London, London, UK
| | - Joanna Szular
- School of Biological & Chemical Sciences, Queen Mary University of London, London, UK
| | - Marcel Kaiser
- Swiss Tropical and Public Health Institute, Parasite Chemotherapy, Basel, Switzerland; University of Basel, Basel, Switzerland
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83
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Hargrove TY, Friggeri L, Wawrzak Z, Sivakumaran S, Yazlovitskaya EM, Hiebert SW, Guengerich FP, Waterman MR, Lepesheva GI. Human sterol 14α-demethylase as a target for anticancer chemotherapy: towards structure-aided drug design. J Lipid Res 2016; 57:1552-63. [PMID: 27313059 DOI: 10.1194/jlr.m069229] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2016] [Indexed: 11/20/2022] Open
Abstract
Rapidly multiplying cancer cells synthesize greater amounts of cholesterol to build their membranes. Cholesterol-lowering drugs (statins) are currently in clinical trials for anticancer chemotherapy. However, given at higher doses, statins cause serious side effects by inhibiting the formation of other biologically important molecules derived from mevalonate. Sterol 14α-demethylase (CYP51), which acts 10 steps downstream, is potentially a more specific drug target because this portion of the pathway is fully committed to cholesterol production. However, screening a variety of commercial and experimental inhibitors of microbial CYP51 orthologs revealed that most of them (including all clinical antifungals) weakly inhibit human CYP51 activity, even if they display high apparent spectral binding affinity. Only one relatively potent compound, (R)-N-(1-(3,4'-difluorobiphenyl-4-yl)-2-(1H-imidazol-1-yl)ethyl)-4-(5-phenyl-1,3,4-oxadiazol-2-yl)benzamide (VFV), was identified. VFV has been further tested in cellular experiments and found to decrease proliferation of different cancer cell types. The crystal structures of human CYP51-VFV complexes (2.0 and 2.5 Å) both display a 2:1 inhibitor/enzyme stoichiometry, provide molecular insights regarding a broader substrate profile, faster catalysis, and weaker susceptibility of human CYP51 to inhibition, and outline directions for the development of more potent inhibitors.
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Affiliation(s)
- Tatiana Y Hargrove
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN 37232
| | - Laura Friggeri
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN 37232
| | - Zdzislaw Wawrzak
- Synchrotron Research Center, Life Science Collaborative Access Team, Northwestern University, Argonne, IL
| | - Suneethi Sivakumaran
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN 37232
| | | | - Scott W Hiebert
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN 37232
| | - F Peter Guengerich
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN 37232
| | - Michael R Waterman
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN 37232
| | - Galina I Lepesheva
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN 37232
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84
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Kumar GA, Roy S, Jafurulla M, Mandal C, Chattopadhyay A. Statin-induced chronic cholesterol depletion inhibits Leishmania donovani infection: Relevance of optimum host membrane cholesterol. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2016; 1858:2088-2096. [PMID: 27319380 DOI: 10.1016/j.bbamem.2016.06.010] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2016] [Revised: 06/08/2016] [Accepted: 06/15/2016] [Indexed: 12/15/2022]
Abstract
Leishmania are obligate intracellular protozoan parasites that invade and survive within host macrophages leading to leishmaniasis, a major cause of mortality and morbidity worldwide, particularly among economically weaker sections in tropical and subtropical regions. Visceral leishmaniasis is a potent disease caused by Leishmania donovani. The detailed mechanism of internalization of Leishmania is poorly understood. A basic step in the entry of Leishmania involves interaction of the parasite with the host plasma membrane. In this work, we have explored the effect of chronic metabolic cholesterol depletion using lovastatin on the entry and survival of Leishmania donovani in host macrophages. We show here that chronic cholesterol depletion of host macrophages results in reduction in the attachment of Leishmania promastigotes, along with a concomitant reduction in the intracellular amastigote load. These results assume further relevance since chronic cholesterol depletion is believed to mimic physiological cholesterol modulation. Interestingly, the reduction in the ability of Leishmania to enter host macrophages could be reversed upon metabolic replenishment of cholesterol. Importantly, enrichment of host membrane cholesterol resulted in reduction in the entry and survival of Leishmania in host macrophages. As a control, the binding of Escherichia coli to host macrophages remained invariant under these conditions, thereby implying specificity of cholesterol requirement for effective leishmanial infection. To the best of our knowledge, these results constitute the first comprehensive demonstration that an optimum content of host membrane cholesterol is necessary for leishmanial infection. Our results assume relevance in the context of developing novel therapeutic strategies targeting cholesterol-mediated leishmanial infection.
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Affiliation(s)
- G Aditya Kumar
- CSIR-Centre for Cellular and Molecular Biology, Uppal Road, Hyderabad 500 007, India
| | - Saptarshi Roy
- CSIR-Indian Institute of Chemical Biology, Raja S.C. Mullick Road, Kolkata 700 032, India
| | - Md Jafurulla
- CSIR-Centre for Cellular and Molecular Biology, Uppal Road, Hyderabad 500 007, India
| | - Chitra Mandal
- CSIR-Indian Institute of Chemical Biology, Raja S.C. Mullick Road, Kolkata 700 032, India.
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85
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Linscott KB, Niehaus TD, Zhuang X, Bell SA, Chappell J. Mapping a kingdom-specific functional domain of squalene synthase. Biochim Biophys Acta Mol Cell Biol Lipids 2016; 1861:1049-1057. [PMID: 27320012 DOI: 10.1016/j.bbalip.2016.06.008] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2016] [Revised: 06/10/2016] [Accepted: 06/13/2016] [Indexed: 10/21/2022]
Abstract
Squalene synthase catalyzes the first committed step in sterol biosynthesis and consists of both an amino-terminal catalytic domain and a carboxy-terminal domain tethering the enzyme to the ER membrane. While the overall architecture of this enzyme is identical in eukaryotes, it was previously shown that plant and animal genes cannot complement a squalene synthase knockout mutation in yeast unless the carboxy-terminal domain is swapped for one of fungal origin. This implied a unique component of the fungal carboxy-terminal domain was responsible for the complementation phenotype. To identify this motif, we used Saccharomyces cerevisiae with a squalene synthase knockout mutation, and expressed intact and chimeric squalene synthases originating from fungi, plants, and animals. In contrast to previous observations, all enzymes tested could partially complement the knockout mutation when the genes were weakly expressed. However, when highly expressed, non-fungal squalene synthases could not complement the yeast mutation and instead led to the accumulation of a toxic intermediate(s) as defined by mutations of genes downstream in the ergosterol pathway. Restoration of the complete complementation phenotype was mapped to a 26-amino acid hinge region linking the catalytic and membrane-spanning domains specific to fungal squalene synthases. Over-expression of the C-terminal domain containing a hinge domain from fungi, not from animals or plants, led to growth inhibition of wild-type yeast. Because this hinge region is unique to and highly conserved within each kingdom of life, the data suggests that the hinge domain plays an essential functional role, such as assembly of ergosterol multi-enzyme complexes in fungi.
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Affiliation(s)
- Kristin B Linscott
- Department of Molecular and Cellular Biochemistry, University of Kentucky, Lexington, KY 40506-9983, United States
| | - Thomas D Niehaus
- Department of Pharmaceutical Sciences, University of Kentucky, Lexington, KY 40536-0596, United States
| | - Xun Zhuang
- Department of Pharmaceutical Sciences, University of Kentucky, Lexington, KY 40536-0596, United States
| | - Stephen A Bell
- Department of Pharmaceutical Sciences, University of Kentucky, Lexington, KY 40536-0596, United States
| | - Joe Chappell
- Department of Molecular and Cellular Biochemistry, University of Kentucky, Lexington, KY 40506-9983, United States; Department of Pharmaceutical Sciences, University of Kentucky, Lexington, KY 40536-0596, United States.
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86
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Suza WP, Chappell J. Spatial and temporal regulation of sterol biosynthesis in Nicotiana benthamiana. PHYSIOLOGIA PLANTARUM 2016; 157:120-34. [PMID: 26671544 DOI: 10.1111/ppl.12413] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2015] [Revised: 11/11/2015] [Accepted: 11/16/2015] [Indexed: 05/22/2023]
Abstract
Nicotiana benthamiana was used as a model to investigate the spatial and developmental relationship between sterol synthesis rates and sterol content in plants. Stigmasterol levels were approximately twice the level in roots as that found in aerial tissues, while its progenitor sterol sitosterol was the inverse. When incorporation of radiolabeled precursors into sterols was used as measure of in vivo synthesis rates, acetate incorporation was similar across all tissue types, but approximately twofold greater in roots than any other tissue. In contrast, mevalonate incorporation exhibited the greatest differential with the rate of incorporation in roots approximately one-tenth that in apical shoots. Similar to acetate, incorporation of farnesol was higher in roots but remained fairly constant in aerial tissues, suggesting less regulation of the downstream sterol biosynthetic steps. Consistent with the precursor incorporation data, analysis of gene transcript and measurements of putative rate-limiting enzyme activities for 3-hydroxy-3-methylglutaryl-coenzyme A synthase (EC 2.3.3.10) and reductase (EC 1.1.1.34) showed the greatest modulation of levels, while the activity levels for isopentenyl diphosphate isomerase (EC 5.3.3.2) and prenyltransferases (EC 2.5.1.10 and EC 2.5.1.1) also exhibited a strong but moderate correlation with the development age of the aerial tissues of the plants. Overall, the data suggest a multitude of means from transcriptional to posttranslational control affecting sterol biosynthesis and accumulation across an entire plant, and point to some particular control points that might be manipulated using molecular genetic approaches to better probe the role of sterols in plant growth and development.
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Affiliation(s)
- Walter P Suza
- Department of Agronomy, Iowa State University, Ames, IA, 50011-1010, USA
| | - Joe Chappell
- Department of Pharmaceutical Sciences, University of Kentucky, Lexington, KY, 40546-0312, USA
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87
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Faruck MO, Yusof F, Chowdhury S. An overview of antifungal peptides derived from insect. Peptides 2016; 80:80-88. [PMID: 26093218 DOI: 10.1016/j.peptides.2015.06.001] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/23/2014] [Revised: 06/02/2015] [Accepted: 06/05/2015] [Indexed: 12/29/2022]
Abstract
Fungi are not classified as plants or animals. They resemble plants in many ways but do not produce chlorophyll or make their own food photosynthetically like plants. Fungi are useful for the production of beer, bread, medicine, etc. More complex than viruses or bacteria; fungi can be destructive human pathogens responsible for various diseases in humans. Most people have a strong natural immunity against fungal infection. However, fungi can cause diseases when this immunity breaks down. In the last few years, fungal infection has increased strikingly and has been accompanied by a rise in the number of deaths of cancer patients, transplant recipients, and acquired immunodeficiency syndrome (AIDS) patients owing to fungal infections. The growth rate of fungi is very slow and quite difficult to identify. A series of molecules with antifungal activity against different strains of fungi have been found in insects, which can be of great importance to tackle human diseases. Insects secrete such compounds, which can be peptides, as a part of their immune defense reactions. Active antifungal peptides developed by insects to rapidly eliminate infectious pathogens are considered a component of the defense munitions. This review focuses on naturally occurring antifungal peptides from insects and their challenges to be used as armaments against human diseases.
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Affiliation(s)
- Mohammad Omer Faruck
- Department of Biotechnology Engineering, Kulliyah of Engineering, International Islamic University Malaysia, P.O. Box 10, 50728 Kuala Lumpur, Malaysia
| | - Faridah Yusof
- Department of Biotechnology Engineering, Kulliyah of Engineering, International Islamic University Malaysia, P.O. Box 10, 50728 Kuala Lumpur, Malaysia.
| | - Silvia Chowdhury
- Department of Mechatronics Engineering, Kulliyah of Engineering, International Islamic University Malaysia, P.O. Box 10, 50728 Kuala Lumpur, Malaysia
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88
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Molugu TR, Brown MF. Cholesterol-induced suppression of membrane elastic fluctuations at the atomistic level. Chem Phys Lipids 2016; 199:39-51. [PMID: 27154600 DOI: 10.1016/j.chemphyslip.2016.05.001] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2016] [Revised: 04/29/2016] [Accepted: 05/02/2016] [Indexed: 12/14/2022]
Abstract
Applications of solid-state NMR spectroscopy for investigating the influences of lipid-cholesterol interactions on membrane fluctuations are reviewed in this paper. Emphasis is placed on understanding the energy landscapes and fluctuations at an emergent atomistic level. Solid-state (2)H NMR spectroscopy directly measures residual quadrupolar couplings (RQCs) due to individual C-(2)H labeled segments of the lipid molecules. Moreover, residual dipolar couplings (RDCs) of (13)C-(1)H bonds are obtained in separated local-field NMR spectroscopy. The distributions of RQC or RDC values give nearly complete profiles of the order parameters as a function of acyl segment position. Measured equilibrium properties of glycerophospholipids and sphingolipids including their binary and tertiary mixtures with cholesterol show unequal mixing associated with liquid-ordered domains. The entropic loss upon addition of cholesterol to sphingolipids is less than for glycerophospholipids and may drive the formation of lipid rafts. In addition relaxation time measurements enable one to study the molecular dynamics over a wide time-scale range. For (2)H NMR the experimental spin-lattice (R1Z) relaxation rates follow a theoretical square-law dependence on segmental order parameters (SCD) due to collective slow dynamics over mesoscopic length scales. The functional dependence for the liquid-crystalline lipid membranes is indicative of viscoelastic properties as they emerge from atomistic-level interactions. A striking decrease in square-law slope upon addition of cholesterol denotes stiffening relative to the pure lipid bilayers that is diminished in the case of lanosterol. Measured equilibrium properties and relaxation rates infer opposite influences of cholesterol and detergents on collective dynamics and elasticity at an atomistic scale that potentially affects lipid raft formation in cellular membranes.
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Affiliation(s)
- Trivikram R Molugu
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, AZ 85721, USA
| | - Michael F Brown
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, AZ 85721, USA; Department of Physics, University of Arizona, Tucson, AZ 85721, USA.
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89
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Lange Y, Steck TL. Active membrane cholesterol as a physiological effector. Chem Phys Lipids 2016; 199:74-93. [PMID: 26874289 DOI: 10.1016/j.chemphyslip.2016.02.003] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2015] [Revised: 02/04/2016] [Accepted: 02/08/2016] [Indexed: 02/05/2023]
Abstract
Sterols associate preferentially with plasma membrane sphingolipids and saturated phospholipids to form stoichiometric complexes. Cholesterol in molar excess of the capacity of these polar bilayer lipids has a high accessibility and fugacity; we call this fraction active cholesterol. This review first considers how active cholesterol serves as an upstream regulator of cellular sterol homeostasis. The mechanism appears to utilize the redistribution of active cholesterol down its diffusional gradient to the endoplasmic reticulum and mitochondria, where it binds multiple effectors and directs their feedback activity. We have also reviewed a broad literature in search of a role for active cholesterol (as opposed to bulk cholesterol or lipid domains such as rafts) in the activity of diverse membrane proteins. Several systems provide such evidence, implicating, in particular, caveolin-1, various kinds of ABC-type cholesterol transporters, solute transporters, receptors and ion channels. We suggest that this larger role for active cholesterol warrants close attention and can be tested easily.
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Affiliation(s)
- Yvonne Lange
- Department of Pathology, Rush University Medical Center, 1653 W. Congress Parkway, Chicago, IL 60612, USA.
| | - Theodore L Steck
- Department of Biochemistry and Molecular Biology, University of Chicago, 929 East 57th Street, Chicago, IL 60637, USA.
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90
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Hernández-Jiménez M, Martínez-López D, Gabandé-Rodríguez E, Martín-Segura A, Lizasoain I, Ledesma MD, Dotti CG, Moro MA. Seladin-1/DHCR24 Is Neuroprotective by Associating EAAT2 Glutamate Transporter to Lipid Rafts in Experimental Stroke. Stroke 2016; 47:206-13. [DOI: 10.1161/strokeaha.115.010810] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2015] [Accepted: 10/20/2015] [Indexed: 01/10/2023]
Abstract
Background and Purpose—
3β-Hydroxysteroid-Δ24 reductase (DHCR24) or selective alzheimer disease indicator 1 (seladin-1), an enzyme of cholesterol biosynthetic pathway, has been implicated in neuroprotection, oxidative stress, and inflammation. However, its role in ischemic stroke remains unexplored. The aim of this study was to characterize the effect of seladin-1/DHCR24 using an experimental stroke model in mice.
Methods—
Dhcr24
+/−
and wild-type (WT) mice were subjected to permanent middle cerebral artery occlusion. In another set of experiments, WT mice were treated intraperitoneally either with vehicle or U18666A (seladin-1/DHCR24 inhibitor, 10 mg/kg) 30 minutes after middle cerebral artery occlusion. Brains were removed 48 h after middle cerebral artery occlusion for infarct volume determination. For protein expression determination, peri-infarct region was obtained 24 h after ischemia, and Western blot or cytometric bead array was performed.
Results—
Dhcr24
+/
−
mice displayed larger infarct volumes after middle cerebral artery occlusion than their WT littermates. Treatment of WT mice with the seladin-1/DHCR24 inhibitor U18666A also increased ischemic lesion. Inflammation-related mediators were increased after ischemia in
Dhcr24
+/
−
mice compared with WT counterparts. Consistent with a role of cholesterol in proper function of glutamate transporter EAAT2 in membrane lipid rafts, we found a decreased association of EAAT2 with lipid rafts after ischemia when DHCR24 is genetically deleted or pharmacologically inhibited. Accordingly, treatment with U18666A decreases [
3
H]-glutamate uptake in cultured astrocytes.
Conclusions—
These results support the idea that lipid raft integrity, ensured by seladin-1/DHCR24, plays a crucial protective role in the ischemic brain by guaranteeing EAAT2-mediated uptake of glutamate excess.
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Affiliation(s)
- Macarena Hernández-Jiménez
- From the Unidad de Investigación Neurovascular, Departamento de Farmacología, Facultad de Medicina, Universidad Complutense and Instituto de Investigación Hospital 12 de Octubre (i+12), Madrid, Spain (M.H.-J., D.M.-L., I.L., M.A.M.); and Centro de Biología Molecular Severo Ochoa, CSIC, Madrid, Spain (E.G.-R., A.M.-S., M.D.L., C.G.D.)
| | - Diego Martínez-López
- From the Unidad de Investigación Neurovascular, Departamento de Farmacología, Facultad de Medicina, Universidad Complutense and Instituto de Investigación Hospital 12 de Octubre (i+12), Madrid, Spain (M.H.-J., D.M.-L., I.L., M.A.M.); and Centro de Biología Molecular Severo Ochoa, CSIC, Madrid, Spain (E.G.-R., A.M.-S., M.D.L., C.G.D.)
| | - Enrique Gabandé-Rodríguez
- From the Unidad de Investigación Neurovascular, Departamento de Farmacología, Facultad de Medicina, Universidad Complutense and Instituto de Investigación Hospital 12 de Octubre (i+12), Madrid, Spain (M.H.-J., D.M.-L., I.L., M.A.M.); and Centro de Biología Molecular Severo Ochoa, CSIC, Madrid, Spain (E.G.-R., A.M.-S., M.D.L., C.G.D.)
| | - Adrian Martín-Segura
- From the Unidad de Investigación Neurovascular, Departamento de Farmacología, Facultad de Medicina, Universidad Complutense and Instituto de Investigación Hospital 12 de Octubre (i+12), Madrid, Spain (M.H.-J., D.M.-L., I.L., M.A.M.); and Centro de Biología Molecular Severo Ochoa, CSIC, Madrid, Spain (E.G.-R., A.M.-S., M.D.L., C.G.D.)
| | - Ignacio Lizasoain
- From the Unidad de Investigación Neurovascular, Departamento de Farmacología, Facultad de Medicina, Universidad Complutense and Instituto de Investigación Hospital 12 de Octubre (i+12), Madrid, Spain (M.H.-J., D.M.-L., I.L., M.A.M.); and Centro de Biología Molecular Severo Ochoa, CSIC, Madrid, Spain (E.G.-R., A.M.-S., M.D.L., C.G.D.)
| | - María D. Ledesma
- From the Unidad de Investigación Neurovascular, Departamento de Farmacología, Facultad de Medicina, Universidad Complutense and Instituto de Investigación Hospital 12 de Octubre (i+12), Madrid, Spain (M.H.-J., D.M.-L., I.L., M.A.M.); and Centro de Biología Molecular Severo Ochoa, CSIC, Madrid, Spain (E.G.-R., A.M.-S., M.D.L., C.G.D.)
| | - Carlos G. Dotti
- From the Unidad de Investigación Neurovascular, Departamento de Farmacología, Facultad de Medicina, Universidad Complutense and Instituto de Investigación Hospital 12 de Octubre (i+12), Madrid, Spain (M.H.-J., D.M.-L., I.L., M.A.M.); and Centro de Biología Molecular Severo Ochoa, CSIC, Madrid, Spain (E.G.-R., A.M.-S., M.D.L., C.G.D.)
| | - María A. Moro
- From the Unidad de Investigación Neurovascular, Departamento de Farmacología, Facultad de Medicina, Universidad Complutense and Instituto de Investigación Hospital 12 de Octubre (i+12), Madrid, Spain (M.H.-J., D.M.-L., I.L., M.A.M.); and Centro de Biología Molecular Severo Ochoa, CSIC, Madrid, Spain (E.G.-R., A.M.-S., M.D.L., C.G.D.)
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Abstract
Metabolism refers to the chemical reactions that occur in living cells, and the reactants and products of these reactions compose the metabolome. The lipidome is comprised by hydrophobic metabolites and includes several broad classes of structurally diverse molecules. Lipids supplied by the host cell are required for many viral processes, and many if not all viruses have evolved mechanisms to perturb host metabolism to promote viral replication. This chapter provides background and a framework for examining the role of lipid metabolites in viral processes and rational attempts to target host metabolism as an antiviral strategy.
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92
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Mattiello L, Riaño-Pachón DM, Martins MCM, da Cruz LP, Bassi D, Marchiori PER, Ribeiro RV, Labate MTV, Labate CA, Menossi M. Physiological and transcriptional analyses of developmental stages along sugarcane leaf. BMC PLANT BIOLOGY 2015; 15:300. [PMID: 26714767 PMCID: PMC4696237 DOI: 10.1186/s12870-015-0694-z] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2015] [Accepted: 12/17/2015] [Indexed: 05/18/2023]
Abstract
BACKGROUND Sugarcane is one of the major crops worldwide. It is cultivated in over 100 countries on 22 million ha. The complex genetic architecture and the lack of a complete genomic sequence in sugarcane hamper the adoption of molecular approaches to study its physiology and to develop new varieties. Investments on the development of new sugarcane varieties have been made to maximize sucrose yield, a trait dependent on photosynthetic capacity. However, detailed studies on sugarcane leaves are scarce. In this work, we report the first molecular and physiological characterization of events taking place along a leaf developmental gradient in sugarcane. RESULTS Photosynthetic response to CO2 indicated divergence in photosynthetic capacity based on PEPcase activity, corroborated by activity quantification (both in vivo and in vitro) and distinct levels of carbon discrimination on different segments along leaf length. Additionally, leaf segments had contrasting amount of chlorophyll, nitrogen and sugars. RNA-Seq data indicated a plethora of biochemical pathways differentially expressed along the leaf. Some transcription factors families were enriched on each segment and their putative functions corroborate with the distinct developmental stages. Several genes with higher expression in the middle segment, the one with the highest photosynthetic rates, were identified and their role in sugarcane productivity is discussed. Interestingly, sugarcane leaf segments had a different transcriptional behavior compared to previously published data from maize. CONCLUSION This is the first report of leaf developmental analysis in sugarcane. Our data on sugarcane is another source of information for further studies aiming to understand and/or improve C4 photosynthesis. The segments used in this work were distinct in their physiological status allowing deeper molecular analysis. Although limited in some aspects, the comparison to maize indicates that all data acquired on one C4 species cannot always be easily extrapolated to other species. However, our data indicates that some transcriptional factors were segment-specific and the sugarcane leaf undergoes through the process of suberizarion, photosynthesis establishment and senescence.
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Affiliation(s)
- Lucia Mattiello
- Laboratório Nacional de Ciência e Tecnologia do Bioetanol (CTBE), Centro Nacional de Pesquisa em Energia e Materiais (CNPEM), Caixa Postal 6192, 13083-970, Campinas, SP, Brazil.
- Laboratório de Genoma Funcional, Instituto de Biologia, Universidade Estadual de Campinas Campinas, Caixa Postal 6109, Campinas, 13083-862, SP, Brazil.
| | - Diego Mauricio Riaño-Pachón
- Laboratório Nacional de Ciência e Tecnologia do Bioetanol (CTBE), Centro Nacional de Pesquisa em Energia e Materiais (CNPEM), Caixa Postal 6192, 13083-970, Campinas, SP, Brazil.
| | - Marina Camara Mattos Martins
- Laboratório Nacional de Ciência e Tecnologia do Bioetanol (CTBE), Centro Nacional de Pesquisa em Energia e Materiais (CNPEM), Caixa Postal 6192, 13083-970, Campinas, SP, Brazil.
| | - Larissa Prado da Cruz
- Laboratório Nacional de Ciência e Tecnologia do Bioetanol (CTBE), Centro Nacional de Pesquisa em Energia e Materiais (CNPEM), Caixa Postal 6192, 13083-970, Campinas, SP, Brazil.
| | - Denis Bassi
- Laboratório Nacional de Ciência e Tecnologia do Bioetanol (CTBE), Centro Nacional de Pesquisa em Energia e Materiais (CNPEM), Caixa Postal 6192, 13083-970, Campinas, SP, Brazil.
| | - Paulo Eduardo Ribeiro Marchiori
- Laboratório de Fisiologia de Plantas "Coaracy M. Franco", Centro de Pesquisa e Desenvolvimento em Ecofisiologia e Biofísica, Instituto Agronômico, Caixa Postal 28, Campinas, 13020-902, SP, Brazil.
| | - Rafael Vasconcelos Ribeiro
- Departamento de Biologia de Plantas, Universidade Estadual de Campinas, Caixa Postal 6109, Campinas, 13083-970, SP, Brazil.
| | - Mônica T Veneziano Labate
- Laboratório Max Feffer de Genética de Plantas, Departamento de Genética, Universidade de São Paulo, Caixa Postal 83, Piracicaba, 13400-970, SP, Brazil.
| | - Carlos Alberto Labate
- Laboratório Max Feffer de Genética de Plantas, Departamento de Genética, Universidade de São Paulo, Caixa Postal 83, Piracicaba, 13400-970, SP, Brazil.
| | - Marcelo Menossi
- Laboratório de Genoma Funcional, Instituto de Biologia, Universidade Estadual de Campinas Campinas, Caixa Postal 6109, Campinas, 13083-862, SP, Brazil.
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93
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Olchawa MM, Herrnreiter AM, Pilat AK, Skumatz CMB, Niziolek-Kierecka M, Burke JM, Sarna TJ. Zeaxanthin and α-tocopherol reduce the inhibitory effects of photodynamic stress on phagocytosis by ARPE-19 cells. Free Radic Biol Med 2015; 89:873-82. [PMID: 26482868 PMCID: PMC4847939 DOI: 10.1016/j.freeradbiomed.2015.10.411] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/23/2015] [Revised: 10/07/2015] [Accepted: 10/14/2015] [Indexed: 12/18/2022]
Abstract
Zeaxanthin and α-tocopherol have been previously shown to efficiently protect liposomal membrane lipids against photosensitized peroxidation, and to protect cultured RPE cells against photodynamic killing. Here the protective action of combined zeaxanthin and α-tocopherol was analyzed in ARPE-19 cells subjected to photodynamic (PD) stress mediated by rose Bengal (RB) or merocyanine-540 (MC-540) at sub-lethal levels. Stress-induced cytotoxicity was analyzed by the MTT assay. The peroxidation of membrane lipids was determined by HPLC-EC (Hg) measurements of cholesterol hydroperoxides using cholesterol as a mechanistic reporter molecule. The specific phagocytosis of FITC-labeled photoreceptor outer segments (POS) isolated from bovine retinas was measured by flow cytometry, and the levels of phagocytosis receptor proteins αv integrin subunit, β5 integrin subunit and MerTK were quantified by Western blot analysis. Cytotoxicity measures confirmed that PD stress levels used for phagocytosis analysis were sub-lethal and that antioxidant supplementation protected against higher, lethal PD doses. Sub-lethal PD stress mediated by both photosensitizers induced the accumulation of 5α-OOH and 7α/β-OOH cholesterol hydroperoxides and the addition of the antioxidants substantially inhibited their accumulation. Antioxidant delivery prior to PD stress also reduced the inhibitory effect of stress on POS phagocytosis and partially reduced the stress-induced diminution of phagocytosis receptor proteins. The use of a novel model system where oxidative stress was induced at sub-lethal levels enable observations that would not be detectable using lethal stress models. Moreover, novel observations about the protective effects of zeaxanthin and α-tocopherol on photodynamic damage to ARPE-19 cell membranes and against reductions in the abundance of receptor proteins involved in POS phagocytosis, a process essential for photoreceptor survival, supports the importance of the antioxidants in protecting of the retina against photooxidative injury.
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Affiliation(s)
- Magdalena M Olchawa
- Department of Biophysics, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, 30-387 Krakow, Poland
| | - Anja M Herrnreiter
- Department of Ophthalmology, Eye Institute, Medical College of Wisconsin, Milwaukee, WI 53226, USA
| | - Anna K Pilat
- Department of Biophysics, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, 30-387 Krakow, Poland
| | - Christine M B Skumatz
- Department of Ophthalmology, Eye Institute, Medical College of Wisconsin, Milwaukee, WI 53226, USA
| | - Magdalena Niziolek-Kierecka
- Department of Biophysics, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, 30-387 Krakow, Poland
| | - Janice M Burke
- Department of Ophthalmology, Eye Institute, Medical College of Wisconsin, Milwaukee, WI 53226, USA
| | - Tadeusz J Sarna
- Department of Biophysics, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, 30-387 Krakow, Poland.
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94
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Yamauchi Y, Yokoyama S, Chang TY. ABCA1-dependent sterol release: sterol molecule specificity and potential membrane domain for HDL biogenesis. J Lipid Res 2015; 57:77-88. [PMID: 26497474 DOI: 10.1194/jlr.m063784] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2015] [Indexed: 01/28/2023] Open
Abstract
Mammalian cells synthesize various sterol molecules, including the C30 sterol, lanosterol, as cholesterol precursors in the endoplasmic reticulum. The build-up of precursor sterols, including lanosterol, displays cellular toxicity. Precursor sterols are found in plasma HDL. How these structurally different sterols are released from cells is poorly understood. Here, we show that newly synthesized precursor sterols arriving at the plasma membrane (PM) are removed by extracellular apoA-I in a manner dependent on ABCA1, a key macromolecule for HDL biogenesis. Analysis of sterol molecules by GC-MS and tracing the fate of radiolabeled acetate-derived sterols in normal and mutant Niemann-Pick type C cells reveal that ABCA1 prefers newly synthesized sterols, especially lanosterol, as the substrates before they are internalized from the PM. We also show that ABCA1 resides in a cholesterol-rich membrane domain resistant to the mild detergent, Brij 98. Blocking ACAT activity increases the cholesterol contents of this domain. Newly synthesized C29/C30 sterols are transiently enriched within this domain, but rapidly disappear from this domain with a half-life of less than 1 h. Our work shows that substantial amounts of precursor sterols are transported to a certain PM domain and are removed by the ABCA1-dependent pathway.
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Affiliation(s)
- Yoshio Yamauchi
- Department of Biochemistry II, Nagoya University Graduate School of Medicine, Nagoya 466-8550, Japan Department of Biochemistry, Geisel School of Medicine at Dartmouth, Hanover, NH 03755
| | - Shinji Yokoyama
- Nutritional Health Science Research Center and Department of Food and Nutritional Sciences, Chubu University, Kasugai 487-8501, Japan
| | - Ta-Yuan Chang
- Department of Biochemistry, Geisel School of Medicine at Dartmouth, Hanover, NH 03755
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95
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Wenz JJ. Molecular properties of steroids involved in their effects on the biophysical state of membranes. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2015; 1848:2448-59. [DOI: 10.1016/j.bbamem.2015.07.017] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2015] [Revised: 07/28/2015] [Accepted: 07/29/2015] [Indexed: 12/24/2022]
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96
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Burgess LG, Uppal K, Walker DI, Roberson RM, Tran V, Parks MB, Wade EA, May AT, Umfress AC, Jarrell KL, Stanley BOC, Kuchtey J, Kuchtey RW, Jones DP, Brantley MA. Metabolome-Wide Association Study of Primary Open Angle Glaucoma. Invest Ophthalmol Vis Sci 2015; 56:5020-8. [PMID: 26230767 DOI: 10.1167/iovs.15-16702] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
PURPOSE To determine if primary open-angle glaucoma (POAG) patients can be differentiated from controls based on metabolic characteristics. METHODS We used ultra-high resolution mass spectrometry with C18 liquid chromatography for metabolomic analysis on frozen plasma samples from 72 POAG patients and 72 controls. Metabolome-wide Spearman correlation was performed to select differentially expressed metabolites (DEM) correlated with POAG. We corrected P values for multiple testing using Benjamini and Hochberg false discovery rate (FDR). Hierarchical cluster analysis (HCA) was used to depict the relationship between participants and DEM. Differentially expressed metabolites were matched to the METLIN metabolomics database; both DEM and metabolites significantly correlating with DEM were analyzed using MetaboAnalyst to identify metabolic pathways altered in POAG. RESULTS Of the 2440 m/z (mass/charge) features recovered after filtering, 41 differed between POAG cases and controls at FDR = 0.05. Hierarchical cluster analysis revealed these DEM to associate into eight clusters; three of these clusters contained the majority of the DEM and included palmitoylcarnitine, hydroxyergocalciferol, and high-resolution METLIN matches to sphingolipids, other vitamin D-related metabolites, and terpenes. MetaboAnalyst also indicated likely alteration in steroid biosynthesis pathways. CONCLUSIONS Global ultrahigh resolution metabolomics emphasized the importance of altered lipid metabolism in POAG. The results suggest specific metabolic processes, such as those involving palmitoylcarnitine, sphingolipids, vitamin D-related compounds, and steroid precursors, may contribute to POAG status and merit more detailed study with targeted methods.
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Affiliation(s)
- L Goodwin Burgess
- Vanderbilt Eye Institute Vanderbilt University Medical Center, Nashville, Tennessee, United States
| | - Karan Uppal
- Department of Medicine, Emory University Medical Center, Atlanta, Georgia, United States
| | - Douglas I Walker
- Department of Medicine, Emory University Medical Center, Atlanta, Georgia, United States
| | - Rachel M Roberson
- Vanderbilt Eye Institute Vanderbilt University Medical Center, Nashville, Tennessee, United States
| | - ViLinh Tran
- Department of Medicine, Emory University Medical Center, Atlanta, Georgia, United States
| | - Megan B Parks
- Vanderbilt Eye Institute Vanderbilt University Medical Center, Nashville, Tennessee, United States
| | - Emily A Wade
- Vanderbilt Eye Institute Vanderbilt University Medical Center, Nashville, Tennessee, United States
| | - Alexandra T May
- Vanderbilt Eye Institute Vanderbilt University Medical Center, Nashville, Tennessee, United States
| | - Allison C Umfress
- Vanderbilt Eye Institute Vanderbilt University Medical Center, Nashville, Tennessee, United States
| | - Kelli L Jarrell
- Vanderbilt Eye Institute Vanderbilt University Medical Center, Nashville, Tennessee, United States
| | - Brooklyn O C Stanley
- Vanderbilt Eye Institute Vanderbilt University Medical Center, Nashville, Tennessee, United States
| | - John Kuchtey
- Vanderbilt Eye Institute Vanderbilt University Medical Center, Nashville, Tennessee, United States
| | - Rachel W Kuchtey
- Vanderbilt Eye Institute Vanderbilt University Medical Center, Nashville, Tennessee, United States
| | - Dean P Jones
- Department of Medicine, Emory University Medical Center, Atlanta, Georgia, United States
| | - Milam A Brantley
- Vanderbilt Eye Institute Vanderbilt University Medical Center, Nashville, Tennessee, United States
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97
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Neubauer C, Dalleska NF, Cowley ES, Shikuma NJ, Wu CH, Sessions AL, Newman DK. Lipid remodeling in Rhodopseudomonas palustris TIE-1 upon loss of hopanoids and hopanoid methylation. GEOBIOLOGY 2015; 13:443-53. [PMID: 25923996 DOI: 10.1111/gbi.12143] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2015] [Accepted: 03/23/2015] [Indexed: 05/17/2023]
Abstract
The sedimentary record of molecular fossils (biomarkers) can potentially provide important insights into the composition of ancient organisms; however, it only captures a small portion of their original lipid content. To interpret what remains, it is important to consider the potential for functional overlap between different lipids in living cells, and how the presence of one type might impact the abundance of another. Hopanoids are a diverse class of steroid analogs made by bacteria and found in soils, sediments, and sedimentary rocks. Here, we examine the trade-off between hopanoid production and that of other membrane lipids. We compare lipidomes of the metabolically versatile α-proteobacterium Rhodopseudomonas palustris TIE-1 and two hopanoid mutants, detecting native hopanoids simultaneously with other types of polar lipids by electrospray ionization mass spectrometry. In all strains, the phospholipids contain high levels of unsaturated fatty acids (often >80%). The degree to which unsaturated fatty acids are modified to cyclopropyl fatty acids varies by phospholipid class. Deletion of the capacity for hopanoid production is accompanied by substantive changes to the lipidome, including a several-fold rise of cardiolipins. Deletion of the ability to make methylated hopanoids has a more subtle effect; however, under photoautotrophic growth conditions, tetrahymanols are upregulated twofold. Together, these results illustrate that the 'lipid fingerprint' produced by a micro-organism can vary depending on the growth condition or loss of single genes, reminding us that the absence of a biomarker does not necessarily imply the absence of a particular source organism.
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Affiliation(s)
- C Neubauer
- Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, USA
| | - N F Dalleska
- Environmental Analysis Center, California Institute of Technology, Pasadena, CA, USA
| | - E S Cowley
- Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, USA
| | - N J Shikuma
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, USA
| | - C-H Wu
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, USA
| | - A L Sessions
- Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, USA
| | - D K Newman
- Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, USA
- Environmental Analysis Center, California Institute of Technology, Pasadena, CA, USA
- Howard Hughes Medical Institute, Pasadena, CA, USA
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98
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Róg T, Pöyry S, Vattulainen I. Building Synthetic Sterols Computationally - Unlocking the Secrets of Evolution? Front Bioeng Biotechnol 2015; 3:121. [PMID: 26347865 PMCID: PMC4543873 DOI: 10.3389/fbioe.2015.00121] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2015] [Accepted: 08/07/2015] [Indexed: 01/28/2023] Open
Abstract
Cholesterol is vital in regulating the physical properties of animal cell membranes. While it remains unclear what renders cholesterol so unique, it is known that other sterols are less capable in modulating membrane properties, and there are membrane proteins whose function is dependent on cholesterol. Practical applications of cholesterol include its use in liposomes in drug delivery and cosmetics, cholesterol-based detergents in membrane protein crystallography, its fluorescent analogs in studies of cholesterol transport in cells and tissues, etc. Clearly, in spite of their difficult synthesis, producing the synthetic analogs of cholesterol is of great commercial and scientific interest. In this article, we discuss how synthetic sterols non-existent in nature can be used to elucidate the roles of cholesterol’s structural elements. To this end, we discuss recent atomistic molecular dynamics simulation studies that have predicted new synthetic sterols with properties comparable to those of cholesterol. We also discuss more recent experimental studies that have vindicated these predictions. The paper highlights the strength of computational simulations in making predictions for synthetic biology, thereby guiding experiments.
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Affiliation(s)
- Tomasz Róg
- Department of Physics, Tampere University of Technology , Tampere , Finland
| | - Sanja Pöyry
- Department of Physics, Tampere University of Technology , Tampere , Finland
| | - Ilpo Vattulainen
- Department of Physics, Tampere University of Technology , Tampere , Finland ; MEMPHYS-Center for Biomembrane Physics, University of Southern Denmark , Odense , Denmark
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99
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Hąc-Wydro K, Węder K, Mach M, Flasiński M, Wydro P. The influence of cholesterol precursor – desmosterol – on artificial lipid membranes. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2015; 1848:1639-45. [DOI: 10.1016/j.bbamem.2015.04.017] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2015] [Revised: 04/26/2015] [Accepted: 04/30/2015] [Indexed: 10/23/2022]
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100
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Khadka M, Salem M, Leblond JD. Sterol Composition and Biosynthetic Genes of Vitrella brassicaformis
, a Recently Discovered Chromerid: Comparison to Chromera velia
and Phylogenetic Relationship with Apicomplexan Parasites. J Eukaryot Microbiol 2015; 62:786-98. [DOI: 10.1111/jeu.12237] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2014] [Revised: 02/04/2015] [Accepted: 02/05/2015] [Indexed: 11/29/2022]
Affiliation(s)
- Manoj Khadka
- Department of Biology; Middle Tennessee State University; PO Box 60 Murfreesboro Tennessee 37132
| | - Mohamed Salem
- Department of Biology; Middle Tennessee State University; PO Box 60 Murfreesboro Tennessee 37132
| | - Jeffrey D. Leblond
- Department of Biology; Middle Tennessee State University; PO Box 60 Murfreesboro Tennessee 37132
- Ecology and Evolution Group; Middle Tennessee State University; PO Box 60 Murfreesboro Tennessee 37132
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