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Crystal structure of the Borna disease virus matrix protein (BDV-M) reveals ssRNA binding properties. Proc Natl Acad Sci U S A 2009; 106:3710-5. [PMID: 19237566 DOI: 10.1073/pnas.0808101106] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Borna disease virus (BDV) is a neurotropic enveloped RNA virus that causes a noncytolytic, persistent infection of the central nervous system in mammals. BDV belongs to the order Mononegavirales, which also includes the negative-strand RNA viruses (NSVs) Ebola, Marburg, vesicular stomatitis, rabies, mumps, and measles. BDV-M, the matrix protein (M-protein) of BDV, is the smallest M-protein (16.2 kDa) among the NSVs. M-proteins play a critical role in virus assembly and budding, mediating the interaction between the viral capsid, envelope, and glycoprotein spikes, and are as such responsible for the structural stability and individual form of virus particles. Here, we report the 3D structure of BDV-M, a full-length M-protein structure from a nonsegmented RNA NSV. The BDV-M monomer exhibits structural similarity to the N-terminal domain of the Ebola M-protein (VP40), while the surface charge of the tetramer provides clues to the membrane association of BDV-M. Additional electron density in the crystal reveals the presence of bound nucleic acid, interpreted as cytidine-5'-monophosphate. The heterologously expressed BDV-M copurifies with and protects ssRNA oligonucleotides of a median length of 16 nt taken up from the expression host. The results presented here show that BDV-M would be able to bind RNA and lipid membranes simultaneously, expanding the repertoire of M-protein functionalities.
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Wang C, Zheng J, Zhao L, Rastogi VK, Shah SS, DeFrank JJ, Leblanc RM. Infrared reflection-absorption spectroscopy and polarization-modulated infrared reflection-absorption spectroscopy studies of the organophosphorus acid anhydrolase langmuir monolayer. J Phys Chem B 2008; 112:5250-6. [PMID: 18373370 DOI: 10.1021/jp709591e] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The secondary structure of the organophosphorus acid anhydrolase (OPAA) Langmuir monolayer in the absence and presence of diisopropylfluorophosphate (DFP) in the subphase was studied by infrared reflection-absorption spectroscopy (IRRAS) and polarization-modulated IRRAS (PM-IRRAS). The results of both the IRRAS and the PM-IRRAS indicated that the alpha-helix and the beta-sheet conformations in OPAA were parallel to the air-water interface at a surface pressure of 0 mN.m-1 in the absence of DFP in the subphase. When the surface pressure increased, the alpha-helix and the beta-sheet conformations became tilted. When DFP was added to the subphase at a concentration of 1.1 x 10(-5) M, the alpha-helix conformation of OPAA was still parallel to the air-water interface, whereas the beta-sheet conformation was perpendicular at 0 mN.m-1. The orientations of both the alpha-helix and the beta-sheet conformations did not change with the increase of surface pressure. The shape of OPAA molecules is supposed to be elliptic, and the long axis of OPAA was parallel to the air-water interface in the absence of DFP in the subphase, whereas the long axis became perpendicular in the presence of DFP. This result explains the decrease of the limiting molecular area of the OPAA Langmuir monolayer when DFP was dissolved in the subphase.
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Affiliation(s)
- Chengshan Wang
- Department of Chemistry, University of Miami, Coral Gables, Florida 33146, USA
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Dziri L, Desbat B, Leblanc RM. Polarization-Modulated FT-IR Spectroscopy Studies of Acetylcholinesterase Secondary Structure at the Air−Water Interface. J Am Chem Soc 1999. [DOI: 10.1021/ja990099d] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Leila Dziri
- Contribution from Centre for Supramolecular Science, Department of Chemistry, University of Miami, 1301 Memorial Drive, Coral Gables, Florida 33146-0431; and Laboratoire de Physico-Chimie Moléculaire, Université Bordeaux I, 351 Cours de la Libération, 33405 Talence, France
| | - Bernard Desbat
- Contribution from Centre for Supramolecular Science, Department of Chemistry, University of Miami, 1301 Memorial Drive, Coral Gables, Florida 33146-0431; and Laboratoire de Physico-Chimie Moléculaire, Université Bordeaux I, 351 Cours de la Libération, 33405 Talence, France
| | - Roger M. Leblanc
- Contribution from Centre for Supramolecular Science, Department of Chemistry, University of Miami, 1301 Memorial Drive, Coral Gables, Florida 33146-0431; and Laboratoire de Physico-Chimie Moléculaire, Université Bordeaux I, 351 Cours de la Libération, 33405 Talence, France
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Rose PL, Harvey NG, Arnett EM. Chirality and Molecular Recognition in Monolayers at the Air–Water Interface. ADVANCES IN PHYSICAL ORGANIC CHEMISTRY VOLUME 28 1993. [DOI: 10.1016/s0065-3160(08)60180-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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Yagi Y, Kimura S, Imanishi Y. Interaction of Poly[N-(3-aminopropyl)glycine] and Its Derivatives with Lipid Membrane. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1988. [DOI: 10.1246/bcsj.61.3983] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Carrier D, Pézolet M. Investigation of polylysine-dipalmitoylphosphatidylglycerol interactions in model membranes. Biochemistry 1986; 25:4167-74. [PMID: 3741849 DOI: 10.1021/bi00362a027] [Citation(s) in RCA: 62] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The effect of poly(L-lysine) on dipalmitoylphosphatidylglycerol bilayers has been studied by Raman and infrared spectroscopies, small-angle X-ray diffraction, and carboxyfluorescein escape experiments. The polypeptide is shown to induce a stabilization of the bilayer detected by the increase of interchain vibrational coupling and a slight decrease of the overall disorder. In addition, long polylysine (Mr 150,000) induces a positive shift of the gel to fluid transition temperature and, at lipid to lysine molar ratios greater than 1, a lateral phase separation within the bilayer. Raman and infrared spectra indicate modifications at the head group level. In contrast, short polylysine (Mr 4,000) leads to a decrease of the lipid thermotropic transition temperature, and no modification of the polar head group and no phase separation could be observed. These differences between short and long polypeptides are correlated with the conformation the polypeptide adopts upon binding to the lipid, which favors the formation of alpha-helices in the case of long polypeptides (Mr greater than or equal to 14,000). The X-ray data suggest that the basic polypeptide acts as a bridge between neighboring bilayers, thus causing their aggregation and dehydration.
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Rudolph AS, Crowe JH, Crowe LM. Effects of three stabilizing agents--proline, betaine, and trehalose--on membrane phospholipids. Arch Biochem Biophys 1986; 245:134-43. [PMID: 3947095 DOI: 10.1016/0003-9861(86)90197-9] [Citation(s) in RCA: 143] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
We have studied the interaction between three compounds which accumulate in organisms under hydration stress--proline, betaine, and trehalose--and the membrane phospholipids dimyristoylphosphatidylcholine (DMPC), palmitoyloleoylphosphatidylcholine (POPC), and dimyristoylphosphatidylethanolamine in bulk solution. Film balance studies reveal that these compounds increase the area/molecule of these lipids. Differential scanning calorimetry has been employed to investigate the effect these agents have on the gel-to-liquid crystalline phase transition of multilamellar and small unilamellar vesicles of DMPC, dipalmitoylphosphatidylcholine, and POPC:phosphatidylserine (90:10 mole ratio) in bulk solution. In the presence of 1 M proline, trehalose, or betaine, the midtransition temperature in small unilamellar vesicles is reduced (up to 7 degrees C in 1 M trehalose), and the transition broadened. In contrast, multilamellar vesicles of similar lipid composition show an increased transition temperature in the presence of the same concentration of these compounds. This result suggests that the inner lamellae in multilamellar vesicles may be dehydrated with only a few outer lamellae exposed to the protective compound. Finally, we have used stereomodels of phosphatidylcholine to investigate the mechanism of action of these agents. Hydrogen bonding of trehalose to the head group region results in an increase in the distance between head groups of 6.9 A. This amount of spreading compares well with data from the monolayer experiments which indicate that maximal spreading of DMPC monolayers by trehalose is 6.5 A. Molecular models of proline and betaine have also been constructed, and these models suggest potential interactions between these compounds and phosphatidylcholines. For the amphipath proline, this interaction may involve intercalation between phospholipid head groups.
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Carrier D, Dufourcq J, Faucon JF, Pézolet M. A fluorescence investigation of the effects of polylysine on dipalmitoylphosphatidylglycerol bilayers. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 1985. [DOI: 10.1016/0005-2736(85)90224-x] [Citation(s) in RCA: 36] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Abstract
Polylysine promoted extensive membrane mixing of liposomes only if the buffer pH was below the pKa of the lysyl residues. This observation suggested that fusion could be regulated in a physiological pH range if the homopolymer of L-histidine was substituted as fusogen. Microgram quantities of polyhistidine were added to liposomes composed of soybean phospholipids, or to defined phospholipid-cholesterol mixtures which simulate the lipid composition of plasma membranes. A quantitative resonance energy transfer assay determined the extent of lipid phase mixing related to fusion. No fusion was detected at pH 7.4, but when the pH was lowered to 6.5 or below, fusion was rapid and substantial. The extent of membrane mixing increased with progressive acidification of the vesicle-fusogen suspension. The charge density of each polyhistidine molecule, not the total cationic charge per vesicle, influenced the extent of fusion. The kinetics of the fusion reaction were rapid, as membrane mixing was completed within 1 min. If the vesicle suspension was acidified before fusogen addition, the rate of membrane mixing slowed 4-fold. This, as well as a slight increase in light scattering noted whenever polyhistidine was added at pH 7.4, suggests an enhancement of fusion kinetics by preaggregation of vesicles at neutral pH. The lipid composition, regulation of membrane mixing by pH in a physiological range, and rapid kinetics suggest that this model of liposome fusion may be pertinent to understanding some biological fusion events.
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Albert A, Cordoba J. Pure and mixed monolayers of poly-L-methionine and poly-?y-methyl-L-glutamate with 1,2 dioleyl-L-?-phosphatidylcholine at air-water interface. Colloid Polym Sci 1984. [DOI: 10.1007/bf01451712] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Nakagaki M, Okamura E, Kubota S. Penetration of Lysine–Leucine Copolymers into Lecithin Monolayers from Underlying Aqueous Solutions. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1983. [DOI: 10.1246/bcsj.56.3730] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Nakagaki M, Okamura E. Penetration of Lysine Hydrochloride into Lecithin Monolayers from Underlying Aqueous Solutions. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1983. [DOI: 10.1246/bcsj.56.1607] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Salem N, Serpentino P, Puskin JS, Abood LG. Preparation and spectroscopic characterization of molecular species of brain phosphatidylserines. Chem Phys Lipids 1980; 27:289-304. [PMID: 6256092 DOI: 10.1016/0009-3084(80)90024-9] [Citation(s) in RCA: 34] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
This study describes the first preparation and spectroscopic characterization of naturally occurring phospholipids separated according to degree of unsaturation. Phosphatidylserines (PS) have been prepared from bovine brain and shown to be pure by extensive thin layer chromatographic analysis as well as by infrared spectroscopy and fatty acid analysis. The PS has been separated according to degree of unsaturation and prepared using AgNO3-impregnated silica gel H thin-layer chromatography. Fatty acid analysis of the two principal PS subfractions indicates that they are enriched in the molecular species 1-octadecanoyl-2-docosahexaenoyl-sn-glycero-3-phosphorylserine and 1-octadecanoyl-2-octadecenoyl-sn-glycero-3-phosphorylserine. The identity of the two PS subfractions was further verified by rechromatographing on several thin layer systems and by infrared spectroscopy. With the use of a 100 MHz Fourier transform nuclear magnetic resonance (NMR) spectrometer, the spectra of bovine whole brain, white matter, gray matter, monoenoic, and hexaenoic PS were obtained. Distinct proton resonances were assigned to double bond protons, protons adjacent to a double bond, and protons between two double bonds, using fatty acid methyl ester standards. The various PS preparations gave different intensities of the various proton resonances which correlated with differences in fatty acid composition. The method provides a convenient, non-destructive spectroscopic method for distinguishing monoenoic and polyunsaturated species of intact phospholipids. Electron spin resonance studies of nitroxide-labelled cholestane in sonicated PS vesicles showed greater probe motion as the unsaturation of the acyl chains was increased. The hexaenoic PS vesicles were more fluid than monoenoic PS vesicles at all temperatures in the range 10-55 degrees C. These results suggest that neuronal membranes are more fluid than myelin membranes as neuronal membranes contain more hexaenoic phospholipids.
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Schaich KM. Free radical initiation in proteins and amino acids by ionizing and ultraviolet radiations and lipid oxidation--part III: free radical transfer from oxidizing lipids. Crit Rev Food Sci Nutr 1980; 13:189-244. [PMID: 6254726 DOI: 10.1080/10408398009527290] [Citation(s) in RCA: 54] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Parallels and similarities in chemical and functional damage to proteins by ionizing and uv radiations and oxidizing lipids have been recognized for some time. However, only recently have oxidizing lipids been shown directly by electron spin resonance to be radiomimetic also in their capacity for protein free radical production. Free radicals play a key role in the transformation of energy to molecular and cellular damage. It is thus of critical importance to elucidate the general mechanisms of free radical formation and reactions in proteins in order to understand protein involvement in various pathological conditions and in food deterioration. Accordingly, this review is a detailed comparison of gamma-radiation, UV radiation, and lipid oxidation for what is presently known concerning (1) the specific modes of energy deposition and free radical formation, (2) the free radicals formed in proteins and amino acids, and (3) the typical damage correlating with these radicals.
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Hauser H, Phillips M. Interactions of the Polar Groups of Phospholipid Bilayer Membranes. ACTA ACUST UNITED AC 1979. [DOI: 10.1016/b978-1-4831-9993-1.50010-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
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Yamashita T, Shibata A, Yamashita S. Interaction of Synthetic Polypeptides with Lipids in Monolayers. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1978. [DOI: 10.1246/bcsj.51.2751] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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