The link reaction

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A Levels Biology A2 revision Mindmap am The link reaction, erstellt von lucy.wright73 am 29/01/2014.
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Zusammenfassung der Ressource

The link reaction
  1. Converts pyruvate (from glycolysis) to acetate. NAD is reduced.
    1. Decarboxylation and dehydrogenation are enzyme catalysed reactions (pyruvate is substrate)
      1. Pyruvate dehydrogenase removes H atoms; pyruvate decarboxylase removes a carboxyl group
        1. Coenzyme NAD accepts the H atoms; coenzyme A (CoA) accepts the acetate > acetyl CoA
      2. Takes place in the matrix, so pyruvate has to be transported into mitochondria from the cytoplasm
        1. 2 pyruvate + 2 NAD+ (oxidised) + 2 CoA ------> 2 CO2 + 2 reduced NAD + 2 acetyl CoA
          1. No ATP produced, but each NADH carrying 2 H atoms - will take to inner mitochondrial membrane where H atoms used to produce ATP during oxidative phosphorylation
            1. 2 molecules of everything because two molecules of pyruvate derived from each glucose molecule
            2. Pyruvate is 3C, acetate is 2C, acetyl CoA is 2C

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