Follow this link to view a video of the model: http://www.youtube.com/watch?v=r7mehChuzYE&feature=youtu.be
This is a functioning model of ATP Synthase, found in the mitochondria of cells. The top half rotates, picking up and dropping off marbles. This turns and protein subunit that acts like a shaft which causes conformational changes in the bottom portion of the molecule. These changes bring the ADP molecule and the phosphate group together to form ATP. The marbles represent hydrogen ions.
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