Oxidative phosphorylation Flashcards
What are Oxidoreductases?
Enzymes which catalyse the oxidoreduction reactions
Oxidases
Molecular oxygen accepts electrons
Dehydrogenases
Electron transferred to a universal lectron carrier such as NAD+ or FAD
How many protons are pumped in complex I
4
How many protons are pumped in complex II
0
How many protons are pumped in complex III
4
Where do electrons go that from complex I and II
Ubiquinone
Where do electrons from the oxidation of succinate to fumarate go
They are transferred to a bound FAD cofactor
What happens to electrons at complex III
Electrons from Ubiquinone are recieved by III and transferred to cytochrome c
How many electrons does QH2 donate
2
How many electrons does Cyt c accept
1
What happens when QH2 donates its electrons (1st stage)
QH2 is oxidised to Q
1 cytochrome c is reduced
Q is reduced to Q-
What happend when QH2 donates its electrons (2nd stage )
QH2 is oxidised to Q
reducing 1 cytochrme c and further reducing Q- to QH2
How many protons are pumped in complex IV
2
What happens to electrons at complex VI
Electrons are accepted from reduced cytochrome c generated by complex III electrons flow to the terminal electron acceptor (O2)
