Tags: Protein.
Proteorhodopsin is a photoactive retinylidene protein in marine planktonic bacteria archaea and eukaryotes. Just like the homologous pigment bacteriorhodopsin found in some archaea it consists of a transmembrane protein bound to a retinal molecule and functions as a light-driven proton pump. Some members of the family (of more than 800 types) are believed to have sensory functions. Members are known to have different absorption spectra.Proteorhodopsin was first discovered in 2000.