Figure 4: “V”- and “U”-shapes of the wild type dimer as seen along the membrane.
From: New Insights on Signal Propagation by Sensory Rhodopsin II/Transducer Complex
Helices G are shown as cylinders. The angle between the two helices G belonging to the same NpSRII molecule in the “U”- and “V” shapes is shown. The axis of rotation of NpSRII as a rigid body during the transition from the “U”- to “V”-shape is shown in red and the corresponding angle is presented. The structure solved in the I212121 space group (“U”-shape, PDB ID 4GY6) is shown in yellow, the structure solved in the P21212 space group (“V”-shape, PDB ID 1H2S) is shown in green. Primes denote symmetry mates. Solid black lines illustrate the approximate membrane boundaries with “IC” designating the intracellular side and “EC” designate the extracellular side.
