24/09 Lecture 29 - Electron Transport Chain

Electron transport chain

This passes electrons through a series of carries that ultimately reduce molecular oxygen to water, pump protons across the inner mitochondrial membrane, and build a gradient

Complex I

This receives NADH and oxidises it to NAD+ and releases two electrons to the UQ, pumps four protons per oxidation

Complex II

This receives FADH2 carries and oxidises it to FAD and releases two electrons to the UQ, sharing the SDH reaction with the CAC

Complex III

This receives electrons from UQ mobile carriers, releasing one electron at a time to cyt. C, pumps four protons per carrier

Complex IV

This receives one electron at a time from the cytochrome C, and reduces oxygen to water, pumping two protons per carrier received and two water molecules per two carriers 

Ubiquinone

This is a mobile carrier within the electron transport chain, moves between complexes I, II, and III

Cytochrome C

This is a mobile carrier within the electron transport chain, moves between complexes III and IV