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Medmicro Chapter 54 The enveloped virions are spherical, 60 to 70 nm in diameter with a positive-sense, monopartite, single-stranded RNA genome, ca. Virions are spherical, 60 to 70 nm in diameter, with an icosahedral nucleocapsid enclosed in a lipid-protein envelope. The single envelope glycoprotein, E, is the viral hemagglutinin; antibodies against E are involved in virus neutralization and hemagglutination inhibition. gsbs.utmb.edu /microbook/ch054.htm   (6602 words)

RedOrbit - Science - Epidermal Differentiation: The Role of Proteases and Their Inhibitors   (Site not responding. Last check: 2007-10-23) The discovery of mutations that underlie several human diseases caused by genetic defects in the protein or lipid components of the CE, and recent analyses of mouse mutants with defects in the structural components of the CE, catalyzing enzymes, and lipid processing, have highlighted their essential function in establishing the epidermal barrier. Together, the protein envelope and the lipid envelope are essential for effective physical and water barrier function in the skin. As lamellar bodies both contain lipid membranes and acid hydrolases (and possibly proteases and protease inhibitors) intended for extrusion into the intercellular space (Elias et al., 1998; Menon et al., 1992; Rassner et al., 1999), the lamellar body is something of a cross between a secretory granule and a lysosome. www.redorbit.com /news/display/?id=131198   (8521 words)

Lipid composition and fluidity of the human immunodeficiency virus envelope and host cell plasma membranes. Lipid composition and fluidity of the human immunodeficiency virus envelope and host cell plasma membranes. Previous studies have indicated that human immunodeficiency virus (HIV) is enclosed with a lipid envelope similar in composition to cell plasma membranes and to other viruses. However, the relationship between viral envelope lipids and those of the host cell is not known. www.aegis.com /aidsline/1993/sep/M9390256.html   (471 words)

Virus - Wikipedia, the free encyclopedia In the case of the hepatitis B virus the T-number is 4, therefore 240 proteins assemble to form the capsid. In addition to a capsid some viruses are able to hijack a modified form of the cell membrane surrounding an infected host cell, thus gaining an outer lipid layer known as a viral envelope. Covering the virus is an outer envelope with a thick layer of protein studded on its surface. en.wikipedia.org /wiki/Virus   (4560 words)

Cell Envelope.1995 Lipid bilayer must be in fluid state for membrane proteins to function. Lipid A and the KDO region of LPS are essential for viability. Lipid A is responsible for the endotoxin activity of LPS versus eukaryotic cells. www.science.siu.edu /microbiology/micr425/425Notes/02-CellEnv.html   (4123 words)

Ozonics International The avian influenza virion, 100 to 200 nm in diameter is approximately spherical because of its loose-fitting envelope. Approximately 60% of envelope lipids are composed of phospholipids and the rest are cholesterols. Embedded in the envelope are the roots of the peplomers. ozonicsint.com /articles_avian.html   (5295 words)

[Frontiers in Bioscience, 3, d1253-1261, December 15, 1998] The abundance of mycobacterial lipids has been recognized for a long while and much effort has been expended on separating and identifying the various types of lipid present, many of which are unique to mycobacteria. The head groups of the associated lipids, many of which are quite polar, would then form a hydrophilic surface; the whole structure would be an analogue of a normal biological bilayer membrane and would form a barrier to hydrophilic molecules. By studying purified walls, walls with most of their associated lipids removed with the detergent Triton X-114 and whole cells it has been clearly shown that the nature of the mycolic acids is the main determinant of the high-temperature phase change (14). www.bioscience.org /1998/V3/d/draper/d1261.htm   (7248 words)

overview virology The nucleocapsid (icosahedral or helical) is surrounded by a membranous envelope. Most enveloped virions are roughly spherical but may be pleomorphic because the envelope is not rigid. Enveloped viruses release specific proteins that become incorporated into the cytoplasmic membrane of the infected cell. www.channing.harvard.edu /18.htm   (1276 words)

Viral Structure and Replication The lipid nature of the envelope and the cell's membranes means that the two structures can fuse, just as oil mixes with oil but not water. Antireceptors are often found on the glycoprotein spikes of enveloped viruses, protein spikes from the vertices of the icosahedral capsids of non-enveloped viruses, or even a certain portion of a capsomere. These internally enveloped viruses are then transported to the cell membrane in vesicles which fuse with the cell membrane releasing the virions outside the cell. www.rhodes.edu /biology/glindquester/viruses/virusstrucnrep.html   (2422 words)

VIRAHEP-C It enters the cells when the viral envelope joins with the cell's outer edge, which is a lipid layer similar to the viral envelope. The core particle is surrounded by a lipid envelope (orange) with two HCV envelope proteins in it (green). The envelope proteins are made by the HCV E1 and E2 genes. www.edc.gsph.pitt.edu /virahepc/hepcabout.html   (789 words)

Development of ichthyosiform skin compensates for defective permeability barrier function in mice lacking ... Abnormalities in the SC lipid lamellae and CLE of 18.5-dpc TGase 1 Abnormalities in the intercellular lipid lamellae and in the CLEs are retained in the mature TGase 1 Elias, P.M., and Menon, G.K. Structural and lipid biochemical correlates of the epidermal permeability barrier. www.jci.org /cgi/content/full/109/2/243   (5107 words)

Stratum Corneum Protein Dynamics as Evaluated by a Spin-Label Maleimide Derivative: Effect of Urea -- Alonso et al. 81 ... Downing, D. Lipid and protein structures in the permeability barrier of mammalian epidermis. Lipid composition of the superficial stratum corneum cells of the epidermis. The role of the corneocyte lipid envelopes in cohesion of the stratum corneum. www.biophysj.org /cgi/content/full/81/6/3566   (5709 words)

Virus Entry, Assembly, Budding, and Membrane Rafts -- Chazal and Gerlier 67 (2): 226 -- Microbiology and Molecular ... HIV-1 is enclosed in a lipid envelope enriched in cholesterol Implications of lipid microdomains for membrane curvature, budding and fission. Influenza virus assembly and lipid raft microdomains: a role for the cytoplasmic tails of the spike glycoproteins. mmbr.asm.org /cgi/content/full/67/2/226   (8001 words)

Cholesterol 3-Sulfate Interferes with Cornified Envelope Assembly by Diverting Transglutaminase 1 Activity from the ... lipids to protein-bound glutamines by an ester bond (27). Isolation and Quantitation of Lipid Z Esterification of Involucrin Reactive Glutamines by TGase 1-- The tryptic peptides of involucrin reacted with TGase 1 on SLV formulated with 1% lipid Z for 2 h were recovered and quantitated Lipid Z esterified onto involucrin was quantitated by isolating tryptic lipopeptides by C www.jbc.org /cgi/content/full/275/4/2636   (5187 words)

The {{omega}}-hydroxyceramides of pig epidermis are attached to corneocytes solely through {{omega}}-hydroxyl groups -- ... A: Molecular structure proposed for corneocyte lipid envelopes as they might exist in porcine stratum corneum that has not been extracted with solvents, in regions where intercellular lamellae between the corneocyte envelopes are absent. Unbound fatty acids that may contribute to the structure of the envelopes are shown in bold. B: Structure proposed for the corneocyte lipid envelopes in porcine stratum corneum after extraction of the fatty acids. www.jlr.org /cgi/content/full/42/7/1105   (2426 words)

Human Immunodeficiency Virus Type 1 Uses Lipid Raft-Colocalized CD4 and Chemokine Receptors for Productive Entry into ... Lipid raftganglioside GM1 was identified by incubation with Alexa Fluor 488-conjugated CT-B, and the nonraft marker CD71 was visualized using FITC-conjugated anti-CD71 antibody. Lipid rafts and HIV pathogenesis: host membrane cholesterol is required for infection by HIV type 1. Analysis of CD44-containing lipid rafts: recruitment of annexin II and stabilization by the actin cytoskeleton. jvi.asm.org /cgi/content/full/76/10/4709   (8311 words)

SARS and Ozone Therapy: Theoretical Considerations It is known that the lipid composition of viral membranes reflects the lipid composition through which the particles exit. Viral envelopes are composed of lipid bilayers associated with a union of carbohydrates and proteins, glycoproteins, and lipids and phosphates, phospholipids. Lipid enveloped viruses in aqueous media are readily inactivated by ozone via the oxidation of their envelope lipoproteins and glycoproteins (Akey 1985; Shinriki 1988; Vaughn 1990; Wells 1991; Carpendale 1991). www.triroc.com /sunnen/topics/sars.html   (4076 words)

Lipid Sciences, Inc. :: Lipid Sciences, Inc. Retains Wolfe Axelrod Weinberger Associates LLC as Its Investor Relations ... Lipid Sciences, Inc. is a development-stage biotechnology company engaged in the research and development of products and processes to treat major medical indications in which lipids, or fat components, play a key role. The Company's Viral Immunotherapy Platform is focused on the removal of the lipid envelope from certain viruses and other lipid-containing infectious agents by application of its delipidation technology. The Company believes that removing the infectious agent's protective lipid envelope exposes otherwise hidden viral proteins, thereby stimulating the body's immune system to elicit an enhanced response to the infectious agent. sev.prnewswire.com /biotechnology/20050406/SFTU03105042005-1.html   (638 words)

Animal Viruses The region between the outer lipid envelope and the nucleocapsid is called the tegument. The nucleocapsids are enveloped by budding through the nuclear membrane, and the mature viruses are released from the cell through cytoplasmic channels. When enveloped viruses are formed by budding, the release of the viral particles may be slow and the host cell may not be lysed. www.bact.wisc.edu /themicrobialworld/AnimalViruses.html   (3668 words)

A novel function for transglutaminase 1: Attachment of long-chain omega -hydroxyceramides to involucrin by ester bond ... lipid envelope on the surface of epidermal keratinocytes is an The natural and synthetic lipids have similar chain length and differ only by the presence of an (unreactive) ether bond. Saponification reduces the molar mass of peptides by 776 amu, indicating the loss by hydrolysis of 1 mol of lipid Z (lipid Z has a mass of 794.3 amu). www.pnas.org /cgi/content/full/96/15/8402   (4920 words)

A Mixture of alpha -Helical and 310-Helical Conformations for Involucrin in the Human Epidermal Corneocyte Envelope ... Involucrin plays an important role in the lipid and protein compound envelopes of mammalian epidermal corneocytes. Covalently attached to the exterior of the corneocyte protein envelope is a lipid envelope composed mainly of the attachment of lipids were not addressed in that study. www.jbc.org /cgi/content/full/274/52/37340   (2611 words)

Loss of proteolytically processed filaggrin caused by epidermal deletion of Matriptase/MT-SP1 -- List et al. 163 (4): ... Lipids were extracted from desiccated epidermis and analyzed Evidence that filaggrin is a component of cornified cell envelopes in human plantar epidermis. Ichthyosis vulgaris: identification of a defect in synthesis of filaggrin correlated with an absence of keratohyaline granules. www.jcb.org /cgi/content/full/163/4/901   (5961 words)

Natural Approaches to Hepatitis C: Essential Fatty Acids   (Site not responding. Last check: 2007-10-23) It is theorized that the HCV virus has as some part of its structure a lipid or fat envelope. Essential fatty acids such as omega 3 and omega 6 may play an important role in altering the stability of this lipid envelope by either increasing or decreasing cellular membrane fluidity. It is theorized that the disruption or uncoating of the lipid envelope would make HCV more susceptible to destruction by the host’s immune system. www.garynull.com /documents/drwald/HepatitisCPart12.htm   (1048 words)

The Predicted Candidates of Arabidopsis Plastid Inner Envelope Membrane Proteins and Their Expression Profiles -- Koo ... Plastid envelope proteins from the Arabidopsis nuclear genome were predicted using computational methods. on the envelope membranes (Miquel and Browse, 1992 Proteomics of the Chloroplast Envelope Membranes from Arabidopsis thaliana www.plantphysiol.org /cgi/content/full/130/2/823   (6496 words)

Newcastle Disease Virus Inserted in to the envelope are glycoprotein spikes that extend about 8 to 12 nm from the surface of the membrane and that can be readily visualized by electron microscopy (Lamb et al., 2002). Three of these are associated with the lipid envelope of the virion: the haemagglutin-neuraminidase and fusion glycoproteins are anchored in the membrane and appear as protruding spikes on the virion surface, the matrix protein is non-glycosylated and is peripherally attached to the inner surface of the envelope. The remaining three proteins are associated with genomic RNA to form the viral nucleocapsid, these are the nucleocapsid protein, the phosphoprotein and the large protein (Millar et al., 1988). pathport.vbi.vt.edu /pathinfo/pathogens/NCDV.html   (10172 words)

Animal Viruses and Viral Diseases of Humans Measles virus is an enveloped ss (-)RNA virus, a member of the paramyxovirus family, which also includes mumps virus, respiratory syncycial virus (RSV) and the caninie distemper virus (CDV) of dogs and cats. The causative agent is an enveloped ss (-)RNA virus in the Paramyxovirus family. Chickenpox is caused by the Varicella zoster virus (VZV), an icosahedral, enveloped, DNA virus in the Herpes family. www.bact.wisc.edu /themicrobialworld/Viruses1.html   (17196 words)

Disease and Immunity: Virus Structure and Replication Adsorption is achieved by binding between a virus attachment protein, called an antireceptor, and a cellular receptor molecule. Antireceptors are often found on the glycoprotein spikes of enveloped viruses, as protein spikes extending from the vertices of the icosahedral capsids of non-enveloped viruses, or even a certain portion of a capsid subunit. As shown in the diagram below, this involves the fusion of the lipid envelope with the lipid bilayer of the cell. www.rhodes.edu /biology/glindquester/disimm/virusrep.html   (2488 words)

Viruses and The Coconut Diet™ I checked to see if the virus (Epstein-Barr) was lipid enveloped, and found that it was. My roommate has been a herpes carrier for years--not the genital herpes, but my understanding is that all cases of herpes are viral, and that is the important common denominator. She initially got herpes in her eye many years ago, and it was basically dormant for several years after getting the initial episode under control. www.coconutdiet.com /viruses.htm   (1628 words)

Diagram of a Retrovirus Retroviruses are infectious particles consisting of an RNA genome packaged in a protein capsid, surrounded by a lipid envelope. This lipid envelope contains polypeptide chains including receptor binding proteins which link to the membrane receptors of the host cell, initiating the process of infection. Retroviruses contain RNA as the hereditary material in place of the more common DNA. www.accessexcellence.org /RC/VL/GG/diagram.html   (151 words)

Answers to virology MCQ Paper 2 Some may have a lipid envelope which may be destroyed by lipid solvents. SRH is a serological assay, and the CMV DEAFF test is a rapid culture test. HIV envelope antibody remains high throughout the course of HIV infections and thus does not carry any prognostic value. virology-online.com /questions/MCQPaper2answers.htm   (1399 words)

Diagnose-Me: Lipid envelope, BHT warrants investigation as a potential antiviral agent against the AIDS virus..." glycoprotein envelope such as Epstein-Barr are vulnerable to the influence of ozone by its intense oxidizing properties..." envelope viruses (HIV, CMV, herpes etc), kills mycoplasmas, many bacteria and candida albicans..." www.diagnose-me.com /glossary/G313.html   (806 words)

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