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SSRL Researchers Map Transporter Structure
symmetry Gallery: Ben Laposky
Al Ashley Fellowship Proposals Due June 15
Friday - May 25, 2007 |
SSRL Researchers Map Transporter StructureResearchers are one step closer to understanding how cells receive nutrients and dispose of toxins. The study could eventually lead to more efficient drugs and new antibiotics. Proteins embedded on the surface of cells called ATP-Binding Cassette (ABC) transporters are responsible for moving nutrients and waste across cell membranes. The process of active transport uses the energy from bound adenosine triphosphate (ATP), a chemical compound that transports chemical energy, to "pump" nutrients against the concentration gradient. One such ABC transporter, HI1470/1, was recently studied in crystal form at the Stanford Synchrotron Radiation Laboratory's Beamline 9-2. Although the mechanism of transport is not completely understood, it is believed that ATP binding causes the transporter to undergo a structural change, carrying the molecule across the membrane in the process. Five years ago the structure of a similar transporter known as BtuCD was solved. At SSRL, a group of scientists from Caltech have now solved the structure of HI1470/1 in a conformation that differs from that of BtuCD. When the mapped structures of the two transporters were compared, subtle differences, including minor twists and rotations of the membrane spanning region were found. These variations will help researchers better understand the transporting process. In the future, scientists may be able to use this knowledge to develop inhibitors that stop similar transporter proteins from carrying medicines out of cells, thereby increasing the efficiency of drugs. In addition, antibiotics could be produced to stop harmful bacteria from receiving nutrients from transporters, effectively starving the unwanted visitor. |
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Al Ashley Fellowship Proposals Due June 15Applications for the Alonzo W. Ashley Career Development Fellowship are due on June 15, 2007. Don't miss this opportunity to further develop your career while contributing to the mission of the lab. The fellowship was created in 1999 in honor of Al Ashley, who promoted diversity and encouraged career development for employees and career exploration for talented students during his 30 years of service to SLAC. The one-year fellowship can help employees develop and implement programs and projects, explore new job opportunities, and take time off to further their education.
This fellowship must take place between October 1, 2007 and September 30, 2008. To be eligible, you must: |
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