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A nanoscale window to the biological world
Date:12/20/2012

If the key to winning battles is knowing both your enemy and yourself, then scientists are now well on their way toward becoming the Sun Tzus of medicine by taking a giant step toward a priceless advantage the ability to see the soldiers in action on the battlefield.

Investigators at the Virginia Tech Carilion Research Institute have invented a way to directly image biological structures at their most fundamental level and in their natural habitats. The technique is a major advancement toward the ultimate goal of imaging biological processes in action at the atomic level.

"It's sort of like the difference between seeing Han Solo frozen in carbonite and watching him walk around blasting stormtroopers," said Deborah Kelly, an assistant professor at the VTC Research Institute and a lead author on the paper describing the first successful test of the new technique. "Seeing viruses, for example, in action in their natural environment is invaluable."

The technique involves taking two silicon-nitride microchips with windows etched in their centers and pressing them together until only a 150-nanometer space between them remains. The researchers then fill this pocket with a liquid resembling the natural environment of the biological structure to be imaged, creating a microfluidic chamber.

Then, because free-floating structures yield images with poor resolution, the researchers coat the microchip's interior surface with a layer of natural biological tethers, such as antibodies, which naturally grab onto a virus and hold it in place.

In a recent study in Lab on a Chip, Kelly joined Sarah McDonald, also an assistant professor at the VTC Research Institute, to prove that the technique works.

McDonald provided a pure sample of rotavirus double-layered particles for the study.

"What's missing in the field of structural biology right now is dynamics h
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Contact: Paula Byron
paulabyron@vtc.vt.edu
540-526-2027
Virginia Tech
Source:Eurekalert  

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