Transport Across Membranes

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Bacteriorhodopsin

by بيسان عبدالحميد مصطفى ولد علي _ - Saturday, 19 February 2022, 10:33 AM

Bacteriorhodopsin is a proton pump found in Archaea, it takes light energy (photons of light) and coverts it into chemical energy, ATP, by creating electrochemical proton gradient that drives the synthesis of ATP by an ATP synthase, then ATP can be used by the cell for cellular functions. Bacteriorhodopsin forms chains in a cylindrical shape(each subunit consist of seven alpha-helical membrane spanning segments ), which contain retinal molecule which is a light- absorbing pigment(chromophore) that is related to vitamin A .

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Bacteriorhodopsin structure

by منى امين سعد الدين صدر _ - Saturday, 12 March 2022, 7:09 AM

Bacteriorhodopsin is a protein used by Archaea, the most notable one being Halobacteria. 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

It consists of seven transmembrane helices surrounding the chromophore, retinal. Halorhodopsin is a second member of the same family of membrane proteins, both of them from the cell membrane of halobacteria.