Wiktionary
bacteriorhodopsin
n. (context protein English) Any of several related purple photosynthetic proteins, found in halobacteria, that act as proton pumps.
Wikipedia
Bacteriorhodopsin
Bacteriorhodopsin is a protein used by Archaea, most notably by Halobacteria, a class of the Euryarchaeota. It acts as a proton pump; that is, it captures light energy and uses it to move protons across the membrane out of the cell. The resulting proton gradient is subsequently converted into chemical energy.
Usage examples of "bacteriorhodopsin".
An analog of bacteriorhodopsin, George Fox had told him, closer to a class of Earthly bacteria that converted sunlight to energy than to chloroplasts.