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Citric Acid Cycle
enzymes and more
11
Biochemistry
Undergraduate 4
03/28/2011

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Term
citrate synthase
Definition
  • acetyl CoA to citrate.
  • ligation / condensation reaction.
  • sequential ordered mechanism: oxaloacetate reacts first and creates a new active site for acetyl CoA
Term
aconitase
Definition
  • citrate to isocitrate - isomerisation.
  • dehydration and hydration reactions.
Term
isocitrate dehydrogenase
Definition
  • isocitrate to alpha-ketoglutarate.
  • makes NADH.
  • decarboxylation and oxidation reaction.
  • up regulated by ADP, down by ATP and NADH
Term
alpha-ketoglutarate dehydrogenase complex
Definition
  • alpha-ketoglutarate to succinyl coA.
  • makes NADH.
  • uses Coenzyme A, FAD, TPP.
  • 3 subunits.
  • decarboxylation and oxidation reactions.
  • down reg by succ. CoA, ATP, NADH
Term
succinyl CoA synthetase
Definition
  • succinyl CoA to succinate.
  • makes GTP and CoA.
  • substrate-level phophorylation reaction.
Term
succinate dehydrogenase
Definition
  • succinate to fumarate.
  • makes enzyme bound FADH2 from enzyme bound FAD.
  • oxidation reaction.
Term
fumarase
Definition
fumarate to malate. Uses water - hydration reaction.
Term
malate dehydrogenase
Definition
  • malate to oxaloacetate.
  • Makes NADH.
  • oxidation reaction.
Term
calculating ATP produced from one glucose.
Definition
  • FADH2 = 1.5 ATP
  • NADH = 2.5 ATP
  • GTP = ATP
  • glycolysis: 3-5 ATP from NADH; 4 net ATP.
  • 2 pyruvate produced.
  • NADH from PDH, isocitrate DH, alpha-KG DHC, malate DH.
  • Get GTP from succinyl CoA synthetase.
  • Get FADH2 from succinate DH.
  • TOTAL 30-32 ATP
Term
biosynthetic precursors produced
Definition
citrate: for fatty acids, sterols.
alpha-ketoglutarate: for glutamate (amino acids and purineS)
succinyl CoA: for heme, chlorophyll
oxaloacetate: for acetate (amino acids, purines, pyrimidines.)
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