VCAC: Cellular Processes: Electron Transport Chain: Advanced Look: NaDH Dehydrogenase

NADH is the electron donor for the electron transport chain. The first complex to accept the donated electrons is NADH dehydrogenase. Clicking on each of the thumbnail images will bring up a larger, labeled version of the described scene.

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	The electron transport chain is embedded in the inner membrane of the mitochondria. It consists of four large protein complexes, and two smaller mobile carrier proteins.
	NADH is the electron donor in this system. It initiates the electron transport chain by donating electrons to NADH dehydrogenase (blue).
	NADH donates two electrons to NADH dehydrogenase. At the same time, the complex also pumps two protons from the matrix space of the mitochondria into the intermembrane space.
	The two electrons are now transferred to the mobile carrier protein known as ubiquinone. Ubiquinone transports the electrons, two at a time, to the next complex in the chain.

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