Scientists Solve Mystery of Bacterial Sodium Pump
Many disease-causing bacteria rely on a sodium pump. This enzyme is called Na⁺-NQR. It helps fuel their growth. For years, scientists did not understand how it works. The pump uses redox reactions. These reactions transfer electrons between molecules. As a result, the pump moves sodium ions across the cell membrane.
However, the intermediate steps were too fleeting to see. Therefore, the exact mechanism remained a mystery.
Capturing the Pump in Action
Researchers at Kyoto University found a solution. They used cryo-electron microscopy. This tool captures tiny structural details. In addition, they ran molecular dynamics simulations. The team also used a compound called korormicin. This inhibitor stabilized the short-lived states. As a result, they could see the pump change shape.
How Electron Flow Moves Sodium
The images revealed a clear process. Electron transfer triggers structural shifts in the enzyme. These shifts control a gate inside the membrane. The gate opens and closes. Consequently, sodium ions pass through. “Our study explains how redox reactions drive sodium transport,” says one researcher. This mechanism differs from proton pumps in human cells.
Toward New Antibiotics
The team now wants to block this pump. Disabling it could kill harmful bacteria. Therefore, this discovery may lead to novel antibiotics. The research remains basic science for now. Nevertheless, it offers a promising path forward.
