B1510_F07_metabolic_evolution_diversity

B1510_F07_metabolic_evolution_diversity - Georgia Tech...

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Biology 1510 Georgia Tech School of Biology Fall 2007 Evolution & Diversity of Energy Metabolism What were the first metabolic pathways that evolved in the first cells or proto-cells? How can life flourish in the absence of oxygen or light? What is the diversity of microbial energy metabolism?
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Biology 1510 Georgia Tech School of Biology Fall 2007 Q: An organism that fixes CO 2 , lives deep in a cave, and oxidizes ammonia for energy would be: a) A chemoheterotroph b) A photoheterotroph c) A chemoautotroph d) A photoautotroph
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Biology 1510 Georgia Tech School of Biology Fall 2007 What pathways were present in the last universal common ancestor? Glycolysis & fermentation: Electron transport chain & chemiosmotic ATP synthesis:
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Biology 1510 Georgia Tech School of Biology Fall 2007 Q: What may have been the energy source for the first cells or proto-cells? a) Sunlight-excited pigment molecules as electron donor, oxygen as electron acceptor b) Organic chemicals as electron donor, oxygen as electron acceptor c) Sunlight-excited pigment molecules as electron donor, oxidized pigment molecules as electron acceptor d) Inorganic chemicals as electron donor, minerals as electron acceptor
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Biology 1510 Georgia Tech School of Biology Fall 2007 Chemoautotrophic Pathways Reaction Name* C Pathway Aerobic Ammonia oxidation NH 4 + + 2O 2 NO 3 - + 2H + + H 2 O Calvin Methane oxidation CH 4 + 2O 2 CO 2 + 2H 2 O RMP Mn Oxidation 2Mn 2+ + O 2 + 2H 2 O 2MnO 2 + 4H + Calvin Fe Oxidation 2Fe 2+ + O 2 + 10H 2 O 4Fe(OH) 3 + 8H + Calvin Sulfide Oxidation H 2 S + 2O 2 SO 4 2- + 2H + R-TCA, Calvin H Oxidation 2H 2 + O 2 2H 2 O R-TCA, Calvin Anaerobic Denitrification 2NO 3 - + 5H 2 N 2 + 4H 2 O + 2OH - Calvin, A-CoA Fe Reduction 2FeOOH + 4H + + H 2 Fe 2+ + 4H 2 O Calvin Sulfate Reduction SO 4 2- + 4H 2 + 2H + H 2 S + 4H 2 O A-CoA Methanogenesis CO 2 + 4H 2 CH 4 + 2H 2 O A-CoA Adapted from Table 1 of Engel, A.S. (2005) Chemoautotrophy. In: Culver, D.C. and White, W.B. (eds)
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