1516×1880×8 (1592015 bytes) Sensory rhodopsin II (1gue.pdb) embedded in the membrane with transducin (1got.pdb) under it. Rhodopsin is colored in a rainbow with

- Class • Fold: Transducin alpha-1 subunit rhodopsin binding domain (res. 340-350) • Superfamily: Transducin alpha-1 subunit rhodopsin binding domain (res

- Class • Fold: Transducin gamma-t1 subunit rhodopsin bound fragment (res. 60-71) • Superfamily: Transducin gamma-t1 subunit rhodopsin bound fragment (res

- Class • Fold: Transducin alpha-1 subunit rhodopsin binding domain (res. 340-350) • Superfamily: Transducin alpha-1 subunit rhodopsin binding domain (res

and activates a rhodopsin by conformational change in the disk membrane to R*. Step 2: Next, R* makes repeated contacts with transducin molecules, catalyzing