Tag: Infectious Diseases

Cool Image: Tiny Bacterial Motor

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Phillip Klebba, Kansas State University.

Credit: Phillip Klebba, Kansas State University.

It looks like a fluorescent pill, but this image of an E. coli cell actually shows a new potential target in the fight against infectious diseases. The green highlights a protein called TonB, which is produced by many gram-negative bacteria, including those that cause typhoid fever, meningitis and dysentery. TonB lets bacteria take up iron from the host’s body, which they need to survive. New research from Phillip Klebba of Kansas State University and his colleagues shows how TonB powers iron uptake. When TonB spins within the cell envelope (the bacteria’s “skin”) like a tiny motor, it produces energy that lets another protein pull iron into the cell. This knowledge may lead to the development of antibiotics that block the motion of TonB, potentially stopping an infection in its tracks.

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New Door Opens in the Effort to Stave off Mosquito-Borne Diseases

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Mosquito net

Pyrethroids are used in mosquito nets distributed around the globe. Credit: Kurt Stepnitz, Michigan State University.

In the past decade, mosquitoes in many countries have become increasingly resistant to pyrethroid insecticides used to fend off mosquito-borne diseases such as malaria and dengue fever. Now, Ke Dong of Michigan State University and her colleagues have discovered a second pyrethroid-docking site in the molecular doorways, or channels, that control the flow of sodium into cells. Pyrethroids paralyze and kill mosquitoes and other insects by propping open the door and causing the pests to overdose on sodium, a critical regulator of nerve function. By providing new insights on pyrethroid action at the molecular level—and how mutations in the dual docking sites cause resistance—the findings open avenues to better monitoring and management of insecticide resistance.

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