A new model of the how the protein coat (capsid) of viruses assembles, published in BioMed Central's open access journal BMC Biophysics, shows that the construction of intermediate structures prior to final capsid production (hierarchical assembly) can be more efficient than constructing the capsid protein by protein (direct assembly). The capsid enveloping a virus is essential for protection and propagation of the viral genome. Many viruses have evolved a self-assembly method which is so successful that the viral capsid can self assemble even when removed from its host cell.
The construction of large protein structures has been observed experimentally but the mechanism behind this is not well understood. Even the 'simple' icosahedral protein coat of the T1 virus requires integration of 60 protein components. Computational models of the physical interactions of component proteins are used to investigate the dynamics and physical constraints that regulate whether the components assemble correctly.
Using computer simulations a team from the Institute for Theoretical Physics and the Center for Quantitative Biology (BioQuant), University of Heidelberg, has compared direct and hierarchical assembly methods for T1 and T3 viruses. The team led by Ulrich S Schwarz, realised that direct assembly often led to the formation of unfavorable intermediates, especially when the dissociation rate was low, which hindered further assembly, causing the process to stall. In contrast, for many conditions hierarchical assembly was more reliable, especially if the bonds involved had a low dissociation rate.
Discussing the practical applications of these results, Dr Schwarz commented, "Hierarchical assembly has not been systematically investigated before. Theoretical models and computer simulations, like ours, can be used to understand the mechanism behind assembly of complex viruses and give an indication of how other large protein complexes assemble."
He continued, " With our computer simulations, we are now in a position to investigate systems which are too large to be studied by molecular resolution. This rational approach might have many applications not only in biomedicine, but also in materials science, where many researchers strive to learn from nature how to assembly complex structures."
BioMed Central: http://www.biomedcentral.com
This press release was posted to serve as a topic for discussion. Please comment below. We try our best to only post press releases that are associated with peer reviewed scientific literature. Critical discussions of the research are appreciated. If you need help finding a link to the original article, please contact us on twitter or via e-mail.
A laser-driven particle accelerator just 9 centimetres long is gearing up to rival heavyweights like the Large Hadron Collider
An inside look at Corning’s labs suggests what’s next for the inventor of Gorilla Glass.Someday your smartphone might be able to help you in a new way when you’re traveling: by telling you whether the water is safe to drink.
Scientists shed light on the energetic emission of radiation that occurs in thunderstorms.
NASA's Mars rover has sniffed out short-lived bursts of methane, but whether it's Martian life or just a geological by-product is still unclear
CERN's Large Hadron Collider will be turned back on in March and a few weeks later will start smashing sub-atomic particles together again at nearly double its previous power, helping scientists hunt for clues about the universe.
The flat disc shape of the Milky Way galaxy had been a mystery. Now simulations suggest it could be thanks to winds driven by charged particles
Understanding the different ways in which birds get their vivid hues could help us make coloured displays for devices such as e-readers
The water and sediment flow might have been massive enough to build a mountain, NASA researchers say.
Liquids come in many forms, from bubbles and droplets to jets and sheets. Henri Lhuissier of Paris Diderot University and his colleagues use high-speed cameras to zoom in on the physics behind all kinds of liquid phenomena, which arise throughout nature, such as in the formation of raindrops and morning dew
There’s still a lot scientists don’t know about the Higgs boson. Now, you can help make the next discovery.