Bacteriorhodopsin

Image of bateriorhodopsin subunit colored according to secondary structure.

A key cofactor of bateriorhodopsin is retinol.

Bacteriorhodopsin subunit with each alpha helix highlighted.

Globular view of bacteriorhodospin subunit.

Although the bacteriorhodopsin has not been crystallized as an entire unit, this is the assumed biological molecule, an assembly of three subunits.