Skip to content Skip to main navigation Report an accessibility issue

Broadening the Bilayer

March 31, 2016

The dynamics of “contrast enhanced” unilamellar lipid vesicles reveal the local mechanical properties of nanoscopic domains. Image Credit: Barmak Mostofian, John Nickels, Renee Manning

Lipid molecules have split personalities—one part loves water, whereas the other avoids it at all costs. Lipids make up cell membranes, the frontline defense in preventing cellular access to bacterial and viral invaders.

Many researchers believe that the membrane is not just a scaffold where proteins reside, but instead actually plays an important role in a number of biological processes. Researchers are also starting to see that lipids and proteins can form small patches, similar to a mosaic. This patchiness seems to have a functional role in the life of a cell and in regulating its different processes. Functional patches of lipids are commonly referred to as lipid rafts.

To better understand the biological processes that govern lipid raft formation—processes with broad implications for research ranging from how cells regulate proteins to how viruses invades healthy human cells—researchers at the US Department of Energy’s (DOE’s) Oak Ridge National Laboratory (ORNL) are using two world-class research facilities to study the presence and formation of these nanoscale lipid patches.

“Without having access to high-speed computing and neutron experiments, this study would be impossible,” said ORNL researcher Xiaolin Cheng. Cheng, ORNL researcher John Katsaras, and their respective research groups are collaborating to use the Cray XK7 Titan supercomputer at the Oak Ridge Leadership Computing Facility (OLCF) and the beam lines at the Spallation Neutron Source (SNS)—both DOE Office of Science User Facilities located at ORNL—to understand membrane organization and how it affects biology. In the near term, the larger team seeks to determine the presence or absence of lipid rafts.


Related Publication: Nickels, J., et al. (2015). Mechanical Properties of Nanoscopic Lipid Domains. Journal of the American Chemical Society 137(50), 15772-15780. doi:10.1021/jacs.5b08894