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Functions Of Viral Chemokine Receptor Homologues Important For Cytomegalovirus Pathogenesis And Latency
Funder
National Health and Medical Research Council
Funding Amount
$461,597.00
Summary
Cytomegalovirus (CMV) causes life-threatening disease in babies, transplant recipients and HIV-AIDS patients. We will focus on a CMV gene that has been 'hijacked' from the host cell and enables the virus to switch on signalling molecules within infected cells. We will determine how these signals enable CMV to infect sites of the body that are critical for virus transmission and contribute to long-term virus persistence. Our results will provide new strategies for drugs against CMV.
Determination Of The Mechanisms Of Action Of A Cytomegalovirus Chemokine Receptor Homologue In Pathogenesis
Funder
National Health and Medical Research Council
Funding Amount
$251,341.00
Summary
A number of herpesviruses encode proteins that are similar to proteins of our immune system. These pirated proteins are exploited by the virus to enable it to replicate and persist in the infected individual, usually by evading or gaining advantage from the normal immune response. This project will investigate the role of one such protein found in both human and animal herpesviruses (specifically cytomegaloviruses (CMV)) that is conserved with cellular cell surface proteins (receptors) that bind ....A number of herpesviruses encode proteins that are similar to proteins of our immune system. These pirated proteins are exploited by the virus to enable it to replicate and persist in the infected individual, usually by evading or gaining advantage from the normal immune response. This project will investigate the role of one such protein found in both human and animal herpesviruses (specifically cytomegaloviruses (CMV)) that is conserved with cellular cell surface proteins (receptors) that bind immune signaling molecules (chemokines). Chemokines are important proteins in the early response to infection. Binding of chemokines to their receptors initiates a cascade of signals within the cell that has profound effects on cellular responses to environmental stimuli. Thus, it is believed that herpesviruses have acquired chemokine receptors to modify or react to the immune response, causing infected cells to behave abnormally either despite or in response to chemokine signals. This project will determine how this CMV specific protein affects the function of cells that CMV infects and how this may promote virus replication, dissemination and persistence in infected hosts. We will also engineer CMVs where the activity of the target protein can be inhibited by administration of prototype antiviral drugs. If inhibition of the activity of the protein is found to reduce virus replication, dissemination or persistence, then this will demonstrate that this type of protein would be a suitable target for the development of novel drugs active against CMV infections. CMV can cause serious (potentially life threatening) disease in newborn children (following infection in the uterus) and immunosuppressed people (eg. organ transplant recipients and people with HIV-AIDS). Our studies will improve our understanding of the contribution of a specific CMV protein to disease, thereby assisting efforts to reduce the impact of CMV infections.Read moreRead less
Imaging The Hepatitis C Virus Life Cycle In Real-time
Funder
National Health and Medical Research Council
Funding Amount
$477,504.00
Summary
Hepatitis C virus (HCV) is a serious viral pathogen that causes significant liver disease. This proposal plans to examine how two proteins from the HCV, core and NS5A, interact with host proteins and pathways to facilitate viral replication and release of HCV; two processes that are poorly understood. Specifically we will tag viral proteins to allow us to investigate the HCV life cycle in living cells and determine the role of core and NS5A in facilitating HCV replication. This proposal may unco ....Hepatitis C virus (HCV) is a serious viral pathogen that causes significant liver disease. This proposal plans to examine how two proteins from the HCV, core and NS5A, interact with host proteins and pathways to facilitate viral replication and release of HCV; two processes that are poorly understood. Specifically we will tag viral proteins to allow us to investigate the HCV life cycle in living cells and determine the role of core and NS5A in facilitating HCV replication. This proposal may uncover novel therapeutic strategies to combat HCV.Read moreRead less
Influenza remains an important disease and exacts a high toll in both morbidity and mortality each year. This project will identify the carbohydrates that are utilised by influenza virus to initiate infection throughout the body and map how these carbohydrates interact with the key viral surface proteins. This research will provide new insight into the emergence of new influenza virus strains and cross-species pathogenicity.
Several members of the Flaviviridae family are major pathogens of humans including dengue (DEN), yellow fever (YF), tick-borne encephalitis (TBE), Murray valley encephalitis (MVE), Japanese encephalitis (JE), and hepatitis C virus (HCV). An Australian flavivirus Kunjin (KUN), however, appears to be naturally attenuated and does not cause an overt disease in humans. In contrast, genetically and antigenically closely related to KUN, New York strain of West Nile virus (NY WN) has already caused ~50 ....Several members of the Flaviviridae family are major pathogens of humans including dengue (DEN), yellow fever (YF), tick-borne encephalitis (TBE), Murray valley encephalitis (MVE), Japanese encephalitis (JE), and hepatitis C virus (HCV). An Australian flavivirus Kunjin (KUN), however, appears to be naturally attenuated and does not cause an overt disease in humans. In contrast, genetically and antigenically closely related to KUN, New York strain of West Nile virus (NY WN) has already caused ~500 deaths and over 20,000 registered infections since its emergence in North America in 1999, including 223 deaths and 9122 infections in 2003 alone. Recent studies with DEN indicated that flaviviruses may interfere with early steps of IFN-signalling pathway. The type I Interferon (IFN) response is the first line of defence against viral infections and many viruses have developed different strategies to counteract this response in order to ensure their survival in the infected host. In this grant we seek to exploit our extensive understanding of the molecular biology of KUN virus and the contrasting behaviour of KUN and NY WN viruses to gain an understanding of the role of flavivirus-mediated suppression of host anti-viral IFN response in virus-host relationships and its importance in determining virus virulence.Read moreRead less
The Role Of The Inflammasome In Modulating Disease During Influenza Virus Infection
Funder
National Health and Medical Research Council
Funding Amount
$616,979.00
Summary
Highly pathogenic influenza A virus (IAV) infections in humans are associated with high mortality rates. This project will provide global and fundamental insights into our understanding of why IAV often cause fatal disease. It will advance knowledge of the mechanisms by which the host and virus interact and elucidate how the host's immune system responds to the infection and modulates disease, to facilitate the development of improved treatments for severe IAV infections.
The Role Of Noncoding Viral RNAs In Flavivirus Infection And Exosomal Signalling
Funder
National Health and Medical Research Council
Funding Amount
$683,447.00
Summary
The application is aimed at investigating the novel role for viral noncoding RNAs in exosomal antiviral signalling and associated outcome of infection with West Nile virus. We will identify host enzymes involved in generation of viral noncoding RNAs, determine which host proteins they interact with and how these interactions determine their incorporation into secreted exosomes to influence outcome of infection.
NEW INSIGHT INTO GLYCAN REQUIREMENTS FOR ROTAVIRUS-CELL ATTACHMENT AND ENTRY
Funder
National Health and Medical Research Council
Funding Amount
$1,068,758.00
Summary
Rotavirus causes significant infection and loss of life in children, particularly in underdeveloped countries. This project will investigate the role of carbohydrates as contact points for this deadly virus towards the goal of developing novel vaccines and drug therapies.
Viral And Host Factors Determining Outcome Of Zika Virus Infection
Funder
National Health and Medical Research Council
Funding Amount
$910,780.00
Summary
The proposal aims at identifying viral and host factors determining outcomes of infection with Zika virus, a significant mosquito-transmitted pathogen associated with debilitating neurological pathology in new-borne babies from mothers infected during pregnancy. We will use cutting edge methodologies and infections models to bring our understanding of Zika virus infection to unprecedented level. The results could also facilitate identification of targets for effective anti-viral therapy.