Selective secretion: a novel mechanism of protein trafficking and its role in Phytophthora pathogenicity. Agriculturally important crops and over 3,000 Australian native plants are susceptible to diseases caused by Phytophthora, fungus-like pathogens that live in the soil. Economic losses exceed $200m pa and natural ecosystems are being destroyed on a vast scale. Phytophthora control depends upon a limited number of chemical inhibitors to which resistance has already emerged. New control stra ....Selective secretion: a novel mechanism of protein trafficking and its role in Phytophthora pathogenicity. Agriculturally important crops and over 3,000 Australian native plants are susceptible to diseases caused by Phytophthora, fungus-like pathogens that live in the soil. Economic losses exceed $200m pa and natural ecosystems are being destroyed on a vast scale. Phytophthora control depends upon a limited number of chemical inhibitors to which resistance has already emerged. New control strategies are urgently needed. This research will investigate a novel mechanism for release of infection material recently discovered in Phytophthora cells, and will increase our understanding of how Phytophthora infects host plants, providing vital information required for the development of new, environmentally-safe inhibitors. Read moreRead less
Identifying novel insecticides and their targets: probing Australian arachnid venoms. Insect pests destroy an estimated 2-3 billion dollars of crops in Australia. Insect pests also are responsible for the transmission of many new and re-emerging human, animal and plant diseases threatening health, wellbeing and prosperity. Current insecticides are severely limited by toxicity and/or insect resistance, and some are undergoing use cancellation overseas. Thus there is an urgent need to develop safe ....Identifying novel insecticides and their targets: probing Australian arachnid venoms. Insect pests destroy an estimated 2-3 billion dollars of crops in Australia. Insect pests also are responsible for the transmission of many new and re-emerging human, animal and plant diseases threatening health, wellbeing and prosperity. Current insecticides are severely limited by toxicity and/or insect resistance, and some are undergoing use cancellation overseas. Thus there is an urgent need to develop safer and more specific insecticides that are effective against disease vectors and agricultural pest insects, as well as to identify new insecticide targets. This research has a multi-million dollar potential benefit to agricultural, health and pest control sectorsRead moreRead less
Olfactory signal transduction in Drosophila melanogaster. This project will strengthen Australia's research capabilities in the areas of molecular neurobiology and neurogenetics. The project will equip students with the intellectual and technical skills needed to work in priority areas such as genomics and biotechnology, as well as in medical and agricultural research, and education. The research has possible long term applications in modifying the behaviour of insects of agricultural or medical ....Olfactory signal transduction in Drosophila melanogaster. This project will strengthen Australia's research capabilities in the areas of molecular neurobiology and neurogenetics. The project will equip students with the intellectual and technical skills needed to work in priority areas such as genomics and biotechnology, as well as in medical and agricultural research, and education. The research has possible long term applications in modifying the behaviour of insects of agricultural or medical importance. For example, by inhibiting the ability of insects to perceive specific odours it may ultimately be possible to prevent insects that carry disease from identifying target animals, or plant pests from locating their host plants.Read moreRead less
Olfactory signalling and coding in Drosophila and other insects. Animals rely on olfactory cues to detect food, danger, and others of the same species. The olfactory systems of Drosophila and other insects are simpler than those of mammals, yet complex enough to offer fascinating systems for studying neural information processing. This project aims to investigate the role of the Drosophila odorant receptors in olfactory coding, and to use multiple approaches to isolate components of the poorly u ....Olfactory signalling and coding in Drosophila and other insects. Animals rely on olfactory cues to detect food, danger, and others of the same species. The olfactory systems of Drosophila and other insects are simpler than those of mammals, yet complex enough to offer fascinating systems for studying neural information processing. This project aims to investigate the role of the Drosophila odorant receptors in olfactory coding, and to use multiple approaches to isolate components of the poorly understood insect olfactory signal transduction pathway. In addition, the role of the NO/cGMP pathway in olfactory signalling will be studied using an olfactory mutant that has nitric oxide synthase defects.Read moreRead less
Biogenesis of secretory organelles and the function of adhesins secreted during the establishment of plant disease. Many agriculturally important crops and Australian native plants are susceptible to diseases caused by species of Phytophthora, a fungus-like organism that lives in the soil. Economic losses due to Phytophthora diseases are estimated to exceed $200 million per annum and the scale of environmental damage in natural ecosystems is huge. Currently, control of Phytophthora diseases la ....Biogenesis of secretory organelles and the function of adhesins secreted during the establishment of plant disease. Many agriculturally important crops and Australian native plants are susceptible to diseases caused by species of Phytophthora, a fungus-like organism that lives in the soil. Economic losses due to Phytophthora diseases are estimated to exceed $200 million per annum and the scale of environmental damage in natural ecosystems is huge. Currently, control of Phytophthora diseases largely depends on a very small number of effective chemicals and there is an imminent risk of the development of pathogen resistance. This research will increase our understanding of how Phytophthora spores infect host plants and will identify suitable targets for the development of novel, environmentally safe chemicals that inhibit disease development.Read moreRead less
The Interaction Between CD46 And PSD-95/Dlg-4: Roles In Cell Polarisation And CD46 Signalling.
Funder
National Health and Medical Research Council
Funding Amount
$70,000.00
Summary
Immune defence against pathogens is primarily achieved by the activities of a range of blood cells, including T cells. T cells have specialised functions involving direct killing of the pathogen, and recruitment and activation of other immune cells. Many of these functions require the lymphocyte to become polarised, or asymmetric, in order to concentrate the appropriate cellular machinery towards the site of activity. Examples of polarisation in lymphocytes includes (i) the formation of a single ....Immune defence against pathogens is primarily achieved by the activities of a range of blood cells, including T cells. T cells have specialised functions involving direct killing of the pathogen, and recruitment and activation of other immune cells. Many of these functions require the lymphocyte to become polarised, or asymmetric, in order to concentrate the appropriate cellular machinery towards the site of activity. Examples of polarisation in lymphocytes includes (i) the formation of a single protrusion, or uropod, that forms the basis for cell-cell interactions, (ii) the formation of an immune synapse which allows a T cell to recognise a pathogen, and (iii) the direction of the cellular killing machinery towards the target. The process of cell polarisation is best characterised in neurons and epithelial cells, both of which are asymmetric. In each cell type, a major mechanism of regulating polarisation is the expression and targeting of a family of proteins containing regions called PDZ domains. PDZ domains mediate protein-protein interactions and so allow the assembly of large molecular scaffolds which hold proteins in specific cell sites. The loss of cell polarity in some cells is thought to cause uncontrolled proliferation and tumour progression, and some of the PDZ-containing proteins are tumour suppressors. We have identified a PDZ-containing protein that is polarised in T cells, and have evidence that this protein interacts with and controls the polarisation of a cell surface receptor whose functions include the regulation of T cell function and proliferation. The aim of this proposal is to determine the mechanisms and functional consequences of polarisation of these two proteins in T cells, and to determine whether their interaction or polarisation is important for T cell proliferation.Read moreRead less
Immune defence against pathogens is primarily achieved by the activities of a range of blood cells, including T cells. T cells have specialised functions involving direct killing of the pathogen, and recruitment and activation of other immune cells. Many of these functions require the lymphocyte to become polarised, or asymmetric, in order to concentrate the appropriate cellular machinery towards the site of activity. Examples of polarisation in lymphocytes includes (i) the formation of a single ....Immune defence against pathogens is primarily achieved by the activities of a range of blood cells, including T cells. T cells have specialised functions involving direct killing of the pathogen, and recruitment and activation of other immune cells. Many of these functions require the lymphocyte to become polarised, or asymmetric, in order to concentrate the appropriate cellular machinery towards the site of activity. Examples of polarisation in lymphocytes includes (i) the formation of a single protrusion, or uropod, that forms the basis for cell-cell interactions, (ii) the formation of an immune synapse which allows a T cell to recognise a pathogen, and (iii) the direction of the cellular killing machinery towards the target. The process of cell polarisation is best characterised in neurons and epithelial cells, both of which are asymmetric. In each cell type, a major mechanism of regulating polarisation is the expression and targeting of a family of proteins containing regions called PDZ domains. PDZ domains mediate protein-protein interactions and so allow the assembly of large molecular scaffolds which hold proteins in specific cell sites. The loss of cell polarity in some cells is thought to cause uncontrolled proliferation and tumour progression, and some of the PDZ-containing proteins are tumour suppressors. We have identified a PDZ-containing protein that is polarised in T cells, and have evidence that this protein interacts with and controls the polarisation of a cell surface receptor whose functions include the regulation of T cell function and proliferation. The aim of this proposal is to determine the mechanisms and functional consequences of polarisation of these two proteins in T cells, and to determine whether their interaction or polarisation is important for T cell proliferation.Read moreRead less
Role Of PAK1 In Colorectal Cancer Growth And Metastasis Regulated By Gastrins
Funder
National Health and Medical Research Council
Funding Amount
$460,070.00
Summary
Increased level of PAK1(a protein kinase) was associated with the progression of colorectal (large bowel) cancer (CRC). Gastrin peptides are growth factors responsible for CRC development. The objective of this project is to determine the role of PAK1 in the regulation of CRC growth and metastasis by gastrin peptides. We will use cell culture, animal models and clinical samples in the program. A successful outcome will lead to the development of new CRC therapies such as inhibitors of PAK1.
Enhancement of monopartite geminivirus pathogenicity by satellite DNA beta encoded betaC1 protein: the role of host factors. Australian incursions of geminiviruses are uncontrollable due to their unique mode of spread by whiteflies. The first incursion in Darwin in 1970 has spread to Far Northern Queensland. The second in SE Queensland in 2006 is estimated to cause $500 million loss to horticulture. Our $2 billion cotton industry is threatened by cotton leaf curl diseases from South Asia, where ....Enhancement of monopartite geminivirus pathogenicity by satellite DNA beta encoded betaC1 protein: the role of host factors. Australian incursions of geminiviruses are uncontrollable due to their unique mode of spread by whiteflies. The first incursion in Darwin in 1970 has spread to Far Northern Queensland. The second in SE Queensland in 2006 is estimated to cause $500 million loss to horticulture. Our $2 billion cotton industry is threatened by cotton leaf curl diseases from South Asia, where DNA beta enhances virus replication and disease severity. DNA beta has the potential to enter Australia with several different geminiviruses and to spread into others by co-infection, which requires research on detection and pathogenesis of DNA beta.Read moreRead less
Molecular-genetic organization and evolution of dinoflagellate mitochondria. Dinoflagellates are unicellular organisms that are important parts of the biota as significant primary producers of the oceans. Certain dinoflagellates form essential symbionts of reef-forming corals and loss of the symbiont causes coral bleaching and death, a phenomenon linked to global warming. Dinoflagellate blooms are also notorious for causing fish kills and human illnesses such as paralytic shellfish poisoning. My ....Molecular-genetic organization and evolution of dinoflagellate mitochondria. Dinoflagellates are unicellular organisms that are important parts of the biota as significant primary producers of the oceans. Certain dinoflagellates form essential symbionts of reef-forming corals and loss of the symbiont causes coral bleaching and death, a phenomenon linked to global warming. Dinoflagellate blooms are also notorious for causing fish kills and human illnesses such as paralytic shellfish poisoning. My studies of the mitochondrion will address a major aspect of the biology of this poorly understood group. Mitochondrial function is often a target for drugs and other controlling agents, and therefore these studies could offer scope to better interpret and manage dinoflagellates in our environment.Read moreRead less