March 16, 2010
Long Polymer Chains Perform Intricate Dance
Understanding the steps to the intricate dance inside a cell is essential to one day choreographing the show. By studying the molecules that give a cell its structure, University of Illinois researchers are moving closer to understanding one of those steps: the conga line.
Led by Steve Granick, Founder Professor of Engineering and professor of materials science and engineering, of chemistry, of chemical and biomolecular engineering, and of physics at the U. of I., the team will publish its findings in the journal Physical Review Letters.
Long chains of the molecule actin form filaments that are a key component of the matrix that give cells structure. They play a role in numerous cellular processes, including signaling and transport. Similar polymers are used in applications from tires to contact lenses to the gels used for DNA and protein analyses.
Long actin filaments display snakelike movement, but their serpentine wriggling is limited by crowding from other filaments in the matrix. Researchers have long assumed that actin filaments could move anywhere within a confined cylinder of space, like a snake slithering through a pipe.
However, Granick and his research group have created a new model showing that the filaments' track isn't a perfect cylinder after all. Rather than a snake in a pipe, a filament moves more like a conga line on a crowded dance floor: Sometimes it's a tight squeeze.
To track the filaments' motion, the Illinois team used a novel approach. In the past researchers have observed the entire large molecule, which was like trying to figure out a conga line's trajectory by watching the entire crowd writhing on the dance floor.
"But," Granick said, "if I'm able to follow just one person in the crowd, I know a lot more about how the conga line is moving."
Granick and his team tagged a few individual links in the molecular chain with a tiny fluorescent dye and monitored how those moved as the filament slithered along. In the conga line analogy, this approach would be like giving neon shirts to a few people at various points in the line, turning on black lights, and tracking the neon-clad dancers' motion to map out the conga line's path around the floor.
"What we found is that, as the filaments slither, sometimes they're more free and sometimes they're more tightly tangled up with each other," Granick said. "Just like in a crowded place, you can only move through the empty spaces."
Next, the team will focus on further improving their model to include a molecule's forward motion as well as its lateral wiggling. "So far we've been able to see the conga line bending, moving sideways, and now we want to see it move in the direction it's pointing," Granick said.
"That's the missing link in completing this picture, which will lead to improved understanding of mechanical properties for all the situations where these filaments appear."
The U.S. Department of Energy-funded team also included graduate students Bo Wang (lead author), Juan Guan and Stephen Anthony, research scientist Sung Chul Bae and materials science and engineering professor Kenneth Schweizer.
Image 1: Founder Professor of Engineering Steve Granick, right, led the research team that included materials science and engineering professor Kenneth Schweizer to a better understanding of the conga dance inside a cell. Photo by L. Brian Stauffer
Image 2: Researchers at the University of Illinois found that actin filaments (red) move in a path (blue) with an irregular diameter, instead of a cylinder as widely accepted. | Image courtesy of Bo Wang
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