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6.10 Oxidative phosphorylation/ ETC/ chemiosmosis - PowerPoint PPT Presentation


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6.10 Oxidative phosphorylation/ ETC/ chemiosmosis. Following glycolysis and the citric acid cycle, NADH and FADH 2 account for most of the energy extracted from food

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6 10 oxidative phosphorylation etc chemiosmosis
6.10 Oxidative phosphorylation/ ETC/ chemiosmosis
  • Following glycolysis and the citric acid cycle, NADH and FADH2 account for most of the energy extracted from food
  • These two electron carriers donate electrons to the electron transport chain, which powers ATP synthesis via oxidative phosphorylation
6 10 oxidative phosphorylation etc chemiosmosis1
6.10 Oxidative phosphorylation/ ETC/ chemiosmosis
  • The electron transport chain is in the cristae of the mitochondrion
  • Most of the chain’s components are proteins, which exist in multiprotein complexes
  • The carriers alternate reduced and oxidized states as they accept and donate electrons
  • Electrons drop in free energy as they go down the chain and are finally passed to O2, forming H2O
6 10 oxidative phosphorylation etc chemiosmosis2
6.10 Oxidative phosphorylation/ ETC/ chemiosmosis
  • Electrons are transferred from NADH or FADH2 to the electron transport chain
  • Electrons are passed through a number of proteins including cytochromes (each with an iron atom) to O2
  • The electron transport chain generates no ATP
  • The chain’s function is to break the large free-energy drop from food to O2 into smaller steps that release energy in manageable amounts
slide6

H+

H+

H+

H+

H+

Protein

complex

of electron

carriers

H+

H+

Electron

carrier

H+

ATP

synthase

H+

Intermembrane

space

Inner

mitochondrial

membrane

FADH2

FAD

Electron

flow

H+

O2

+ 2

1

2

NAD+

NADH

H+

H+

Mitochondrial

matrix

ADP +

P

ATP

H+

H2O

H+

Electron Transport Chain

Chemiosmosis

OXIDATIVE PHOSPHORYLATION

so when is the energy made
So when is the energy made?
  • During oxidative phosphorylation
  • Energy stored in electron carriers was released during ETC and a hydrogen ion concentration gradient was created across the cristae
  • The energy in this concentration gradient is used to power ATP synthesis
6 10 oxidative phosphorylation etc chemiosmosis3
6.10 Oxidative phosphorylation/ETC/chemiosmosis
  • Most ATP production occurs by oxidative phosphorylation
  • Oxidative phosphorylation involves electron transport and chemiosmosis and requires an adequate supply of oxygen
    • NADH and FADH2 and the inner membrane of the mitochondria are also involved
    • A H+ ion gradient formed from all of the redox reactions of glycolysis and the citric acid cycle provide energy for the synthesis of ATP