Chikashi Toyoshima's E1-E2 movies based on the SERCA1a structures of the calcium pump.

Homepage of the Stokes laboratory: With several animations including an animation of the complete catalytic cycle (3.9 Mbyte) of SERCA1.

Just for fun: see plant proton pumps in action!

I: (3.8 Mbyte) Here I am ...
II: (3.2 Mbyte) ...working hard...
III: (1.0 Mbyte) ...for the benefit of plants