Do-it-yourself viruses: How viruses self assemble

Dec 16, 2012
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. Credit: Johanna E Baschek, Heinrich CR Klein and Ulrich S Schwarz

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 of the T1 virus requires integration of 60 . 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 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, realized 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."

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More information: Stochastic Dynamics of Virus Capsid Formation: Direct versus Hierarchical Self-Assembly Johanna E Baschek, Heinrich CR Klein and Ulrich S Schwarz, BMC Biophysics (Section: Computational and theoretical biophysics) (in press)

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kevinrtrs
1 / 5 (5) Dec 18, 2012
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.

Herein lies a big conundrum for the person who wrote this line: How does something "evolve" when it's not alive and or does not yet have the capacity to invade a live host to replicate?

What documented evidence does the author have that indeed the virus previously did not have such capacity to self-assemble whereas it now does.

What intermediate steps did it have to pass through in order to develop such an ability to self-assemble in the first place?

How did it survive without the self-assembling ability in place?

Torbjorn_Larsson_OM
5 / 5 (1) Jan 25, 2013
Creationists shouldn't comment on science. It is hilarious and makes deconverts from religion, see Dawkins's Convert's Corner.

Viruses has evolved by parasitic simplification out of cellular lifeforms. ["Giant viruses coexisted with the cellular ancestors and represent a distinct supergroup along with superkingdoms Archaea, Bacteria and Eukarya", Nasir et al, BMC Evolutionary Biology 2012; http://www.biomed...abstract ]

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