REGULATION OF RYANODINE RECEPTOR CALCIUM CHANNELS BY THE CALCIUM BINDING PROTEIN CALSEQUESTRIN. The project is to examine the functional interaction between two proteins in skeletal muscle that are essential for Ca2+ regulation and hence contraction, respiration and movement in all vertebrate species. One protein, the ryanodine receptor, releases calcium from stores inside the muscle cell. The other protein, calsequestrin, binds and sequesters calcium ions. We have recently discovered that th ....REGULATION OF RYANODINE RECEPTOR CALCIUM CHANNELS BY THE CALCIUM BINDING PROTEIN CALSEQUESTRIN. The project is to examine the functional interaction between two proteins in skeletal muscle that are essential for Ca2+ regulation and hence contraction, respiration and movement in all vertebrate species. One protein, the ryanodine receptor, releases calcium from stores inside the muscle cell. The other protein, calsequestrin, binds and sequesters calcium ions. We have recently discovered that the proteins also bind to each other and that calsequestrin regulates Ca2+ release from the stores through the ryanodine receptor ion channel. This regulation is likely to be important in conserving store calcium during stress or fatigue.Read moreRead less
Involvement of cell coupling in vascular function: Development of a computational model. Gap junctions are intercellular channels which enable the production of coordinated responses in multicellular tissues and organs. Blood vessels are comprised of endothelial cells surrounded by smooth muscle cells and gap junctions exist within and between these layers. The present proposal will determine the fundamental role of gap junctions in regulating blood flow and blood pressure. Our data will enable ....Involvement of cell coupling in vascular function: Development of a computational model. Gap junctions are intercellular channels which enable the production of coordinated responses in multicellular tissues and organs. Blood vessels are comprised of endothelial cells surrounded by smooth muscle cells and gap junctions exist within and between these layers. The present proposal will determine the fundamental role of gap junctions in regulating blood flow and blood pressure. Our data will enable us to develop a computational model of the vascular wall and so predict how changes in electrical properties, as occur during pressure changes, can influence blood flow. Since ageing is accompanied by an increase in blood pressure, our results will contribute to a better understanding of blood flow regulation in our ageing population.Read moreRead less
How triadin and junctin communicate with ryanodine receptors deep within a calcium store to determine skeletal muscle contraction. The project results will provide a platform for muscle relaxants and other drugs that will specifically target either the heart or skeletal muscle and will have applications in the livestock, veterinary and pharmaceutical Industries. The project falls within the National Research Priorities of Promoting and Maintaining Good Health and Frontier Technologies for Buil ....How triadin and junctin communicate with ryanodine receptors deep within a calcium store to determine skeletal muscle contraction. The project results will provide a platform for muscle relaxants and other drugs that will specifically target either the heart or skeletal muscle and will have applications in the livestock, veterinary and pharmaceutical Industries. The project falls within the National Research Priorities of Promoting and Maintaining Good Health and Frontier Technologies for Building and Transforming Australian Industries, as well as the national priority goal of Ageing well, Ageing Productively. The project will be of national benefit in training undergraduate students, PhD students and a postdoctoral fellow in state-of-the-art techniques in an internationally competitive research field.Read moreRead less
Suction pipette measurements of mammalian rod photoreceptor recovery following intense bleaching exposures. The aim of this project is to discover the events and processes that prevent retinal photoreceptors from recovering instantaneously following the cessation of exposure to extremely bright illumination. Recordings will be made from single rod photoreceptors cells isolated from the mammalian retina. The work will uncover the relative roles of the 'photoproducts' created when rhodopsin abso ....Suction pipette measurements of mammalian rod photoreceptor recovery following intense bleaching exposures. The aim of this project is to discover the events and processes that prevent retinal photoreceptors from recovering instantaneously following the cessation of exposure to extremely bright illumination. Recordings will be made from single rod photoreceptors cells isolated from the mammalian retina. The work will uncover the relative roles of the 'photoproducts' created when rhodopsin absorbs light: e.g. intermediates such as metarhodopsin and opsin. The molecular knowledge obtained will help us to understand why it is that the visual system recovers so slowly after the eye has experienced very intense light.Read moreRead less
The first stage of vision: transduction and adaptation in retinal photoreceptors. The project aims to provide a detailed understanding of the molecular steps involved in the first stage of vision - the conversion of light into a neural signal in the rod and cone photoreceptors of the retina. The significance of this is that it will explain the initial events that enable us to see, and will help explain the deficits that occur when the process fails. The outcome will be a comprehensive understand ....The first stage of vision: transduction and adaptation in retinal photoreceptors. The project aims to provide a detailed understanding of the molecular steps involved in the first stage of vision - the conversion of light into a neural signal in the rod and cone photoreceptors of the retina. The significance of this is that it will explain the initial events that enable us to see, and will help explain the deficits that occur when the process fails. The outcome will be a comprehensive understanding of how our photoreceptors respond with extreme sensitivity, yet great rapidity, and over an enormous range of light intensities, thus endowing us with our remarkable sense of vision.Read moreRead less
ION CHANNELS FORMED BY SMALL PROTEINS FROM VIRUSES. Movements of ions across cell membranes through protein ion channels are essential for normal cell function. We have found that some small proteins from viruses can form ion channels. Studying these simple channels should give us clues about the function of more complex channels, such as those in the brain, as well as giving us information about the viruses themselves. We will test whether a small protein from Ross River virus forms ion channel ....ION CHANNELS FORMED BY SMALL PROTEINS FROM VIRUSES. Movements of ions across cell membranes through protein ion channels are essential for normal cell function. We have found that some small proteins from viruses can form ion channels. Studying these simple channels should give us clues about the function of more complex channels, such as those in the brain, as well as giving us information about the viruses themselves. We will test whether a small protein from Ross River virus forms ion channels and will also test the effects of selected mutations in proteins from influenza and AIDS viruses that we have shown previously to form ion channels.Read moreRead less
INTRINSIC PROPERTIES OF THE PORE FORMING DOMAIN OF THE RYANODINE RECEPTOR CALCIUM CHANNEL. The project is to understand how a calcium ion channel is able to regulate muscle performance. The ion channel, known as the ryanodine receptor, is essential for human and animal survival. The results of the project will be integral to understanding muscle performance in humans and will have long term implications for Australian sports physiology and sports science. The project will also be integral to ....INTRINSIC PROPERTIES OF THE PORE FORMING DOMAIN OF THE RYANODINE RECEPTOR CALCIUM CHANNEL. The project is to understand how a calcium ion channel is able to regulate muscle performance. The ion channel, known as the ryanodine receptor, is essential for human and animal survival. The results of the project will be integral to understanding muscle performance in humans and will have long term implications for Australian sports physiology and sports science. The project will also be integral to understanding muscle performance and development in animals and will have repercussions for the Australian livestock and racing industries. The results may lead to the development of new insecticides since insect mobility depends on ryanodine receptor activity. This will benefit to Australian agriculture.Read moreRead less