BIMM 120 Lecture12.MetabolicDiversityII.051011

BIMM 120 Lecture12.MetabolicDiversityII.051011 - BIMM 120...

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BIMM 120 Announcements BIMM 120 Announcements HW1 reports can be picked up after class. .. Please swing by my office if you would like to review your MT exam/scantron Paper #2 will be assigned on Thursday. ..and discussed on Tues 5/17 Gorby YA et al. (2006) Electrically conductive bacterial nanowires produced by Shewanella oneidensis strain MR-1 and other microorganisms. Proc Natl Acad Sci USA 103:11358
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Review of Lecture 11 Review of Lecture 11 Types of Microbial Fermentations Types of Microbial Fermentations Different groups ferment different substrates leading to different fermentation products Trophic Classifications Aerobic vs Anaerobic Respiration Respiring Metals Respiring Sulfur Compounds (sulfate reduction) Methanogenesis Fermentation (substrate-level phosphorylation) Syntrophic Syntrophic Interactions Interactions Cross-feeding between different species Anoxic Decomposition Anoxic Decomposition A look at many of these metabolisms together. ..in the real world!
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Substrate Substrate - - Level Level Phosphorylations Phosphorylations (it doesn’t pay well but it covers the bills)
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Syntrophy Syntrophy “sharing is caring” Predominately occurs in anoxic environments Common example is inter-species H 2 transfer - one organism produces H 2 , another consumes it Available energy is very small Mutually beneficial because the reaction kinetics involve an unfavorable reaction (+ Δ G 0 ) coupled to a favorable reaction (- Δ G 0 ’) Species B Species A
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Anoxic Decomposition Anoxic Decomposition One bug’s junk is another bug’s main course This example would be typical of a freshwater environment where [SO 4 2- ] (SRB activity) is minimal let’s look at some of these metabolisms together. .. Just like signal transduction cascades, environments are controlled by “trophic” cascades
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We have already discussed many of these metabolisms These are what we will discuss today. ..
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BIMM 120 BIMM 120 Lecture 12 Lecture 12 Tuesday May 10, 2011 “Phototrophy Phototrophy “Chemolithoautotrophy Chemolithoautotrophy
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Lecture 12 Lecture 12 20.1 Photosynethesis 20.2 20.3 Carotenoids 20.4 Anoxygenic Photosynthesis 20.5 Oxygenic Photosynthesis 20.6 The Calvin-Benson Cycle 20.7 Other Photoautotrophic Pathways 20.8 Energetics of Chemolithotrophy 20.9 Hydrogen Oxidation 20.10 – Reduced Sulfur Oxidations 20.11 – Iron Oxidation 20.12 – Nitrification 20.13 – Anammox 20.14 – Nitrogen Fixation 20.15 – Regulation of N 2 Fixation phototrophy phototrophy chemolithotrophy chemolithotrophy Light or Inorganic compounds as sources of ENERGY
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Chemoorganoheterotrophy ...recall from Lecture 11. .. ...recall from Lecture 11.
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BIMM 120 Lecture12.MetabolicDiversityII.051011 - BIMM 120...

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