Download or read book Newly Identified Roles of Glycoprotein C in Herpes Simplex Virus Infectivity written by Tri Komala Sari and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Herpes simplex virus (HSV) infections are mainly asymptomatic, but are ubiquitous in the adult population, and can be fatal in individuals with suppressed immune systems. Prophylactic and treatment measures have not been sufficient to stop disease dissemination. HSV expresses at least 12 different glycoproteins and utilizes multiple entry pathways to infect cells. This combined with its ability to establish latent infection and evade immune responses have contributed to the challenges in developing effective control measures. HSV uses the concerted action of essential glycoproteins B, D, and H/L to execute entry. HSV carries more than a dozen surface glycoproteins, and this may pose evolutionary advantages. It is likely that HSV uses specific surface glycoprotein(s) to effectively enter one pathway, but not the other. Here we report novel roles of glycoprotein C in HSV infectivity. gB from HSV-1 fully deleted for the gC gene undergoes low-pH induced antigenic changes at a pH that is 0.4-0.6 units lower than wild type. Moreover, gC-null mutant HSV exits cellular endosomes at time points 10-20 min later than wild type, suggesting that gB present in gC-null HSV fuses with a more acidic (later) endosome. We also report for the first time, low-pH antigenic changes in domain II of HSV gB. Although gC plays a role in gB antigenic changes, its absence does not affect gB oligomeric changes nor reversibility of conformational changes under conditions tested. The threshold for reversibility of gB conformational changes in wild type and gC-null HSV is shown to be around pH 5.6. This suggests that at this pH gB exists at an equilibrium of pre- and post-fusion forms. We also tested the ability of gB antibodies to block HSV infectivity in the absence of gC. We found that gC-null HSV is significantly more sensitive to neutralization by gB antibodies. The level and composition of HSV glycoproteins in wild type and gC-null mutant are similar. Interestingly, reactivity of gB antibodies with gC-null virus is greater than wild type. Control gE-null HSV is not more sensitive to neutralization by gB antibodies. Together our results demonstrate newly identified functional interactions between HSV gC and gB.

Download or read book Human Herpesviruses written by Ann Arvin and published by Cambridge University Press. This book was released on 2007-08-16 with total page 1325 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive account of the human herpesviruses provides an encyclopedic overview of their basic virology and clinical manifestations. This group of viruses includes human simplex type 1 and 2, Epstein–Barr virus, Kaposi's Sarcoma-associated herpesvirus, cytomegalovirus, HHV6A, 6B and 7, and varicella-zoster virus. The viral diseases and cancers they cause are significant and often recurrent. Their prevalence in the developed world accounts for a major burden of disease, and as a result there is a great deal of research into the pathophysiology of infection and immunobiology. Another important area covered within this volume concerns antiviral therapy and the development of vaccines. All these aspects are covered in depth, both scientifically and in terms of clinical guidelines for patient care. The text is illustrated generously throughout and is fully referenced to the latest research and developments.

Download or read book Glycoprotein M and ESCRT in Herpes Simplex Virus Type 1 Assembly written by Yudan Ren and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Herpes simplex virus type 1 (HSV-1) has a large linear double-stranded DNA genome in an icosahedral capsid shell, a cell-derived lipid envelope and a proteinaceous tegument layer. There are over fifty viral proteins and many host proteins identified in HSV-1 virions. The final formation of mature virus particles requires the membrane wrapping of tegumented capsids in the cytoplasm, a process termed secondary envelopment. This process involves the coordination of numerous viral and cellular proteins and results in double-membrane structures with enveloped virions contained within cellular vesicles. Mature viruses are then released through the fusion of these virion-containing vesicles and plasma membranes. This thesis describes investigation into the functions of viral glycoprotein M (gM) and the cellular Endosomal Sorting Complexes Required for Transport (ESCRT) in secondary envelopment. Firstly, it has been reported that gH/L can be efficiently internalised and targeted to the TGN by the co-expression of gM in transfection assays. In order to examine the role of gM in guiding the localisation of viral proteins in infected cells, a HSV-1 gM deletion virus (∆gM), and its revertant virus were constructed. The major phenotype demonstrated was that the absence of gM caused the internalisation of cell surface gH/L to be inhibited and higher levels of gH/L to be observed on the cell surface. Further, lower levels of gH/L were detected in purified ∆gM virions, which was in agreement with the delayed entry kinetics, smaller plaque sizes and greater replication deficits at low multiplicity of infection observed in ∆gM infected cells. Over all the results presented in this thesis demonstrate that in infected cells the efficient incorporation of gH/L into virions relies on the function of gM in HSV-1. Secondly, during HSV-1 secondary envelopment the budding and scission of the viral envelope from the host membrane share topological similarities with the formation of intraluminal vesicle in multivesicular bodies, retrovirus budding, and abscission at the end of cytokinesis, processes that require the cellular ESCRT machinery. There are four multiprotein ESCRT complexes and many associated proteins involved in their regulation. It has been previously shown that the ESCRT-III complex and a functional ATPase VPS4 are required for HSV-1 secondary envelopment, but different from the strategy utilised by HIV-1, the recruitment of ESCRT during HSV-1 infection is independent of TSG101 and/or ALIX. Data presented in this thesis demonstrate that CHMP4A/B/C proteins of the ESCRT-III complex are specifically crucial for HSV-1 secondary envelopment. Simultaneous depletion of CHMP4A/B/C proteins significantly inhibited HSV-1 replication. Ultrastructure analysis revealed that there were virtually no extracellular virions in CHMP4A/B/C depleted samples while more free capsids were observed in the cytoplasm, although the nuclear capsids and primary envelopment events appeared to be normal. In order to identify interactions between HSV-1 and ESCRT proteins, 22 HSV-1 tegument proteins were cloned and tested against a panel of ESCRT and ESCRT-associated proteins in yeast two-hydrid assays. Analysis of positive hits from yeast two-hybrid interaction screens using GST pull-down, co-immunoprecipitation and protein co-localisation assays have validated interactions of pUL47 with CC2D1A/1B, CIN85, CHMP6 and ALIX, pUL46 and pUL49 with CC2D1A/1B and CIN85, and pUL16 with CC2D1A/1B. Furthermore, the newly identified ESCRT associated proteins CC2D1A and CC2D1B have been detected in purified virions. The role of the identified ESCRT proteins in HSV-1 replication has been investigated using siRNA depletion. Unfortunately siRNA depletions of the various ESCRT candidates individually or in combinations did not show any significant effect on HSV-1 replication. Overall these data suggest that unlike HIV and other retroviruses, HSV-1 has evolved multiple parallel pathways to hijack the ESCRT machinery to facilitate its replication, particularly, through the interactions that lead directly to the recruitment of CHMP4A/B/C proteins. Disruption of some of these pathways did not prevent HSV-1 replication in tissue culture, suggesting any one potential pathway is sufficient for ESCRT recruitment to sites of HSV-1 assembly.

Download or read book Cell Biology of Herpes Viruses written by Klaus Osterrieder and published by Springer. This book was released on 2017-05-20 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt: Herpes viruses are widely distributed in nature, causing disease in organisms as diverse as bivalves and primates, including humans. Each virus appears to have established a long-standing relationship with its host, and the viruses have the ability to manipulate and control the metabolism of host cells, as well as innate and adaptive antiviral immune responses. Herpes viruses maintain themselves within hosts in a latent state resulting in virus persistence for years – usually for the life span of the hosts. Herpes viruses comprise a large number of pathogens with diverse cellular targets and biological consequences of infection. What they have in common is their structure and the fact that they establish a dormant (latent) infection in their hosts that usually persists for life. The reviews here will highlight the general principles of herpes virus infection, with equal attention to overall principle and important difference. Also, the cell type- and life-style dependent differences in the establishment and maintenance of virus persistence will be covered.

Download or read book Human Herpesviruses written by Yasushi Kawaguchi and published by Springer. This book was released on 2018-06-12 with total page 498 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces and reviews several topics for each human herpesvirus. One of the most important features of the book is that it covers aspects of both basic research and clinical medicine. Herpesviridae, a family of double-strand DNA viruses, has unique biological features by which these viruses establish latency after primary infection and reactivate in later life. Nine human herpesviruses are known so far, and each of them causes a variety of diseases in both primary infection and reactivation. Since the discovery of each human herpesvirus, an abundance of findings related to them has accumulated in basic research and clinical medicine. However, the vast majority of biological features is still masked in mystery. Furthermore, a strategy of treatment and prevention has not yet been established for most human herpesviruses. A wide range of readers will be interested in this volume with its treatment of problematic points and latest findings in the field.

Download or read book Fields Virology Emerging Viruses written by Peter M. Howley and published by Lippincott Williams & Wilkins. This book was released on 2020-02-11 with total page 2597 pages. Available in PDF, EPUB and Kindle. Book excerpt: Now in four convenient volumes, Field’s Virology remains the most authoritative reference in this fast-changing field, providing definitive coverage of virology, including virus biology as well as replication and medical aspects of specific virus families. This volume of Field’s Virology: Emerging Viruses, 7th Edition covers recent changes in emerging viruses, providing new or extensively revised chapters that reflect these advances in this dynamic field.

Download or read book Scanning Electron Microscopy for the Life Sciences written by Heide Schatten and published by Cambridge University Press. This book was released on 2013 with total page 275 pages. Available in PDF, EPUB and Kindle. Book excerpt: A guide to modern scanning electron microscopy instrumentation, methodology and techniques, highlighting novel applications to cell and molecular biology.

Download or read book Immunopotentiators in Modern Vaccines written by Virgil Schijns and published by Elsevier. This book was released on 2005-12-19 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt: Immunopotentiators in Modern Vaccines provides an in-depth insight and overview of a number of most promising immunopotentiators in modern vaccines. In contrast to existing books on the subject it provides recent data on the critical mechanisms governing the activity of vaccine adjuvants and delivery systems. Knowledge of immunological pathways and scenarios of the cells and molecules involved is described and depicted in comprehensive illustrations. - Contributions from leading international authorities in the field - Well-illustrated, informative figures present the interactions between immunopotentiators and the host immune system - Each chapter lists advantages and potential hurdles for achieving a practical application for the specific immunopentiator

Download or read book Micro and Nanotechnology in Vaccine Development written by Mariusz Skwarczynski and published by William Andrew. This book was released on 2016-09-20 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive overview of how use of micro- and nanotechnology (MNT) has allowed major new advance in vaccine development research, and the challenges that immunologists face in making further progress. MNT allows the creation of particles that exploit the inherent ability of the human immune system to recognize small particles such as viruses and toxins. In combination with minimal protective epitope design, this permits the creation of immunogenic particles that stimulate a response against the targeted pathogen. The finely tuned response of the human immune system to small particles makes it unsurprising that many of the lead adjuvants and vaccine delivery systems currently under investigation are based on nanoparticles. - Provides a comprehensive and unparalleled overview of the role of micro- and nanotechnology in vaccine development - Allows researchers to quickly familiarize themselves with the broad spectrum of vaccines and how micro- and nanotechnologies are applied to their development - Includes a combination of overview chapters setting out general principles, and focused content dealing with specific vaccines, making it useful to readers from a variety of disciplines

Download or read book Pathogenicity of Human Herpesviruses due to Specific Pathogenicity Genes written by Yechiel Becker and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 391 pages. Available in PDF, EPUB and Kindle. Book excerpt: Six members of the Herpesviridae family are human pathogens, including herpes and 2 (HSV-I and 2), Epstein-Barr virus (EBV), varicella zoster simplex virus I virus (VZV), human cytomegalovirus (HCMV), and human herpesvirus 6 (HHV 6). Each of these viruses is capable of causing distinct diseases of varying severity in children, young adults, and the aged. The diseases range from infection of epithelial tissue to the infection of internal organs and white blood cells. A common feature of the six pathogenic human herpesviruses is their ability to latently infect different cell types in which the viral DNA is not integrated and is unable to express its pathogenicity. Reactivation of the herpesviruses is a result of cellular processes which reactivate viral genes, leading to virus progeny and to signs of infection. Due to their ability to become latent after initial infection, once the pathogenic herpesviruses infect children they are maintained throughout life, having the potential of cause various diseases upon reactivation.

Download or read book Molecular Diagnostics written by Wayne W. Grody and published by Academic Press. This book was released on 2009-11-06 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in genomic and proteomic profiling of disease have transformed the field of molecular diagnostics, thus leading the way for a major revolution in clinical practice. While the range of tests for disease detection and staging is rapidly expanding, many physicians lack the knowledge required to determine which tests to order and how to interpret results. Molecular Diagnostics provides a complete guide to the use and interpretation of molecular testing in the clinical arena. No other available resource offers this emphasis, comprehensive scope, and practical utility in the clinical setting. - Serves as the definitivereference for molecular pathologists worldwide - Covers a variety of molecular techniques including next generation sequencing, tumor somatic cell genotyping, infectious and genetic disease tecting, and pharmacogenetics - Discusses in the detail issues concerning quality assurance, regulation, ethics, and future directions for the science

Download or read book Origin and Evolution of Viruses written by Esteban Domingo and published by Elsevier. This book was released on 2008-06-23 with total page 573 pages. Available in PDF, EPUB and Kindle. Book excerpt: New viral diseases are emerging continuously. Viruses adapt to new environments at astounding rates. Genetic variability of viruses jeopardizes vaccine efficacy. For many viruses mutants resistant to antiviral agents or host immune responses arise readily, for example, with HIV and influenza. These variations are all of utmost importance for human and animal health as they have prevented us from controlling these epidemic pathogens. This book focuses on the mechanisms that viruses use to evolve, survive and cause disease in their hosts. Covering human, animal, plant and bacterial viruses, it provides both the basic foundations for the evolutionary dynamics of viruses and specific examples of emerging diseases. - NEW - methods to establish relationships among viruses and the mechanisms that affect virus evolution - UNIQUE - combines theoretical concepts in evolution with detailed analyses of the evolution of important virus groups - SPECIFIC - Bacterial, plant, animal and human viruses are compared regarding their interation with their hosts

Download or read book The Third Component of Complement written by John D. Lambris and published by Springer Science & Business Media. This book was released on 2013-03-12 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt: The third component of complement, C3, is one of the most versatile proteins and an important participant in immune surveillance and immune response pathways. Its multifunctio nality is based on its ability to interact specifically with multiple serum complement proteins, cell surface receptors, and mem brant;-associated regulatory proteins. One of its most intriguing strategies of interaction with cell surfaces is the covalent binding of activated C3 through the internal thioester. The field has expanded over the past 10 years and a wealth of information has accumulated. C3 from various species and many of the human C3 binding proteins have been cloned and expressed. Numerous cellular responses mediated by the diffe rent fragments of C3 have been described. The findings that C3 interacts in a ligand-receptor-like fashion with proteins of nonself origin such as the gC of herpes simplex virus, a 70-kDa protein from Candida albicans, proteins from Epstein-Barr virus, etc. has opened a new field of investigation. The papers assembled in this volume summarize the wealth of data on the various aspects of the C3 interactions; together they bring to the reader new information on the chemistry, molecular gene tics, biology, and pathophysiology of C3 and C3-binding proteins. Emphasis is given to structural features as they relate to functions. Spring 1989 JOHN D. LAMBRIS, HANS J. MULLER-EBERHARD Table of Contents J. E. VOLANAKIS: Participation of C3 and Its Ligands in Complement Activation . . . . . . . . . . . 1 S. R. BARNUM, G. FEY, and B. F. TACK: Biosynthesis and Genetics of C3 . . . . . . . . . . . . .

Download or read book Alphaherpesviruses written by Ekaterina E Heldwein and published by . This book was released on 2020-07-24 with total page 640 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Herpesviruses written by Bernard Roizman and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt: A great truth is a truth whose opposite. is also a great truth. Thomas Mann (Essay on Freud, 1937) This volume centers on pseudorabies (PR V), herpes simplex viruses 1 and 2 (HSV-1 and HSV-2), and human cytomegalovirus (CMV) and fulfills three objectives. The chapters on the epidemiology and latency of HSV, and on the glycoproteins specified by HSV and CMV, set the stage for the discussions of the immunobiology and pathogenesis of human herpesvirus infections in Volume 4. The epidemiology of HSV is the basis of our understanding of the spread and survival of this virus in the human populations. Central to the epidemiology of HSV and its pathogenesis in humans is the ability of the virus to remain in a latent state for the life of its host. The viral membrane glycoproteins are among the most interesting virion proteins, primarily because of their critical role in the initiation of infection. Since they are the surface membrane proteins of the virion and appear on the surface of productively infected cells, they are also the obvious if not the exclusive targets of the immune response. The chapters on the transforming potential of HSV and CMV, and on the role of HSV in human cancer, deal with challenging problems requiring rather different experimental tools.

Download or read book Alpha Herpesviruses written by Rozanne Marie Sandri-Goldin and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Unfolded Protein Response written by Roberto Pérez Torrado and published by . This book was released on 2022 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume is divided in six section covering the most experimental approaches involved in the study of the unfolded protein response (UPR) pathway. Chapters detail determination of unfolded protein levels, methods to study UPR signal transmission, analysing the outcomes of the UPR pathway activation, UPR studies in mammalian models, UPR in alternative models, and UPR and disease. Written in the format of the highly successful Methods in Molecular Biology series, each chapter includes an introduction to the topic, lists necessary materials and reagents, includes tips on troubleshooting and known pitfalls, and step-by-step, readily reproducible protocols. Authoritative and cutting-edge, The Unfolded Protein Response: Methods and Protocols aims to describe key methods and approaches used in the study of the UPR pathway and its complex cellular implications. Chapter 6 is available open access under a Creative Commons Attribution 4.0 International License via link.springer.com.