Environmental Microbiology Lecture 3

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Environmental Microbiology Lecture 3

• Bacterial Metabolism

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Living styles of bacteria
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Oxidation-reduction (redox) reactions
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Redox potential gradients (electron tower)
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Redox reactions in chemoorganotrophs

• Fermentation
• Redox processes without exogenous electron
  acceptors
• Substrate-level phosphorylation
• Glycolysis
• Respiration
• Redox processes with exogenous electron acceptors
• Oxidative phosphorylation
• Citric acid cycle and electron transport chain

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Fermentation (Glycolysis)
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Redox reactions in chemoorganotrophs

• Fermentation
• Redox processes without exogenous electron
  acceptors
• Substrate-level phosphorylation
• Glycolysis
• Respiration
• Redox processes with exogenous electron acceptors
• Oxidative phosphorylation
• Citric acid cycle and electron transport chain

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The citric acid cycle (CAC)
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Electron transport chain

• Key electron carriers
• flavins,
• quinones,
• cytochrome complex
• other cytochromes

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Proton motive force
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ATP synthesis (chemiosmosis)
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