Experts estimate less than 30 Orange-bellied Parrots remain in the wild. Researchers from Charles Sturt University have partnered with scientists from the Australian Synchrotron to reconstruct the outer shell of a beak and feather disease (BFD) virus cell (inset), which is threatening four species of endangered Australian parrot.
Australian researchers have unravelled the molecular makeup of a virus threatening some of the world’s most endangered species, paving the way for the potential development of a vaccine to save dwindling populations of the Australian birds.
The research, led by Charles Sturt University (CSU) scientists and published in the prestigious international journal Nature Communications overnight, revealed the structure of the smallest self-replicating virus behind the beak and feather disease (BFD).
The virus causes a debilitating disease affecting four rare species of native parrot, including the Western ground and Orange-bellied Parrots (pictured, above), of which less than 50 remain in the wild.
CSU Professor in Biochemistry Jade Forwood said, ‘We now have a unique way of thinking about the virus and how it self-assembles. We know at the atomic level, the structure of the virus and how it fits together.’
CSU Professor in Veterinary Pathobiology Shane Raidal said, ‘The finding is significant because, by confirming how the viral structure forms, we can begin to develop a vaccine to interrupt these processes.’
The BFD virus programs only two proteins to drive its replication and spread: one to assist the reproduction of the viral DNA, and one to construct the outer shell of the virus. This shell is built from 60 individual capsid proteins that self-assemble and fit together in a highly specific and ordered arrangement around the viral DNA.
The outcomes of this research provide the atomic coordinates of approximately 200,000 atoms which make up the virus, and insights into how the viral DNA can bind to the shell, ensuring the protection and delivery of the viral DNA.
At the Australian Synchrotron in Melbourne, landmark research infrastructure of the Australian Nuclear Science and Technology Organisation (ANSTO), the Micro Crystallography (MX2) beamline produced X-rays more than a million times brighter than the sun to create intricate diffraction patterns as light bounced off microscopic crystals of the viral capsid proteins. This allowed the researchers to identify the locations of the individual atoms and broader structure of the viral shells in stunning 3D detail.
The research team, involving scientists from CSU, Monash University, the Australian Synchrotron, and Spain’s National Microbiology Centre and the Autonomous University of Madrid, have been working on the project since 2009.
Along with the loss of habitat and feral predators, the BFD virus is one of the main threats to the affected parrots, which also include the Norfolk Parakeet (Norfolk Island) and the Swift Parrot (eastern and southern states). Infected birds face starvation and death as their feathers moult and their beaks soften.
Professor Raidal said, ‘The disease has caused significant problems, in particular, for the Orange-bellied Parrot since 2006 when it reappeared in the captive recovery program.
‘The Parrot is a small and vulnerable migratory bird which breeds only on Tasmania’s south-west coast, flying north to spend the winter in coastal Victoria and South Australia, so we look forward to building on this work to find new approaches to restoring their numbers in the wild.’
Mr Barry Baker, Chair of the national Orange-bellied Parrot Recovery Team said it is important new and innovative fields of science work across conservation projects to protect Australia’s at-risk fauna.
‘BFDV is an awful disease, especially in small, short-lived species like Orange-bellied Parrots – young birds with the virus stand little chance of survival in the wild, and affected captive birds are often compromised, as the virus can affect the bird’s ability to fight off other health issues.
‘Although recent Orange-bellied Parrot recovery efforts have proven effective, in 2014 the wild population suffered from a spillover of BFDV (from another wild species) and we believe there are currently less than 30 birds out there – another outbreak of the disease in the wild would be a disaster, so the ability to vaccinate would be a leap forward in parrot conservation, also benefitting captive populations and our ability to release to the wild.’
- 'New weapon against virus killing Australia's endangered parrots', Australian Geographic, Thursday 6 October 2016
- 'Aus researchers’ bird virus breakthrough' on Nine News online, Wednesday 5 October 2016
Whether you’re a synchrotron star keen for the latest technical updates or a student ready to sell your science in the Poster Slam, User Meeting 2016 has something for everyone. Showcasing the best research undertaken at the Australian Synchrotron and featuring local and international plenary speakers, User Meeting 2016 will provide updates on cutting-edge technique and application developments over a two-day program featuring themes and sessions on advanced materials, biological systems, structural biology, earth and environment, therapies, surfaces, industry and imaging.
We’re open for registrations and now calling for abstract submissions.
For more information, visit: Australian Synchrotron User Meeting 2016
Lloyd Rees Memorial Lecture by Professor Keith Nugent
Thursday 6 October, 2016 at 2.30 pm at the Wark Theatre at CSIRO Manufacturing
Sources of the energetic form of light known as X-rays are developing at an enormous rate. Indeed, by one measure, they are improving at a rate that exceeds computing’s famous Moore’s Law.
The rapid improvement of synchrotron sources has driven a very significant part of this growth over the last few decades, but the already dizzying rate of development has recently been accelerated by the construction of X-Ray Free Electron Lasers (XFELS), with the first beginning operation in the USA in 2011. XFELS are now either operating or under construction in a number of countries around the world.
XFELS are based on linear accelerator technology and are able to produce pulses of X-Rays that can be up to ten orders of magnitude brighter than the pulses from modern synchrotrons. This extraordinary growth in capability is certain to unlock new scientific insights and new technologies. In this talk, Professor Nugent will describe the physics underpinning X-Ray Free Electron Lasers. He will go on to outline some of the scientific drivers behind the significant global investment in X-Ray lasers, with the most important being the possibility of imaging a single biomolecule. He will describe his progress towards these scientific goals.
Light refreshments available after the Lecture.
About the speaker
Professor Keith Nugent FAA is internationally recognised for his outstanding contributions to Chemical Physics. As Director of the ARC Centre of Excellence for Coherent X-Ray Science from 2005 to 2013 he has driven the development of coherent X-Ray diffraction methods for imaging biological structures. His other important contribution to Chemical Physics focuses on the complete recovery of phase from intensity and the applications of this to imaging