3D Structure of E. coli beta-galactosidase homotetramer with lactose bound
This is the E. coli beta-galactosidase homotetramer with lactose bound. Two of the four chains have been colored red and green. The other two are shown in "structure" colors where helices are in pink and beta sheets in yellow. The lactose substrate is shown in spacefilling view with CPK colors. You can zoom in to see them if you are interested.