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AN00835 - High resolution imaging of the cytoplasmic side of bacteriorhodopsin
Bacteriorhodopsin (BR) is a trimeric integral membrane protein found in the cell membrane of halobacteria. It acts as a proton pump that captures light energy and uses this to move protons across the membrane. The thus created proton (or pH) gradient is subsequently used to generate ATP, the chemical energy source of many processes inside a cell.
Bacteriorhodopsin is often found in 2-dimensional crystalline patches known as "purple membrane", which were studied here.