L15W10_MIC105_FunWithC1

L15W10_MIC105_FunWithC1 - Lecture 15 MIC105 W10 Fun with C1...

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Lecture 15 MIC105 W10 Fun with C1 methanogenesis aerobic methane oxidation methylotrophy anaerobic methane oxidation (reverse methanogenesis) Tuesday, February 9, 2010
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C1 compounds •no carbon-carbon bonds •CO •CO2 •CH4 (methane) (26X greater green house gas than CO2 •CHOO- (formate) •CH3OH (methanol) •methylamines 2 * Tuesday, February 9, 2010
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The Euryarchaeota Thermophiles, hyperthermophiles Methanogens* Extreme halophiles Archaeoglobus Thermoplasma/Ferroplasma Uncultivated groups * One of the few microbial groups both phenotypically and genetically coherent * Tuesday, February 9, 2010
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* Tuesday, February 9, 2010
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Methanogen diversity All methanogens are Archaea (monophyletic) Strict anaerobes methanogenesis inhibited by O 2 some grow solely on CO 2 and H 2 often grow with bacterial partners (syntrophy) to provide substrates Thermophiles, mesophiles, psychrophiles diverse cell shapes, generally pseudopeptidoglycan walls found in a wide variety of anoxic habitats obligate methanogens * Tuesday, February 9, 2010
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* Tuesday, February 9, 2010
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Tuesday, February 9, 2010
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Habitats of methanogens Soil Animal digestive tracts (termites, ruminants, humans) Marine sediment (tends toward low sulfate) Wetlands (especially rice paddies) LandFlls (large amounts of methane can combust or be used to generate power) Los Reales Arizona - siphon off methane for electricity “GreenWatts” - 1500 homes from landFll site methane hydrates hydrothermal vents * Tuesday, February 9, 2010
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9 Tuesday, February 9, 2010
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Methanogens as symbionts Termite hindgut/cattle Termite mounds can ignite after rainfall (buildup of methane) Many endosymbionts of anaerobic protists (ciliates) Bovine methanogenesis diverts carbon from meat production - contributes to 900L of methane/cow/ day - chemical inhibitors Human digestion (2/3) - 10% of gut microbes, increases efFciency (makes more fat) * Tuesday, February 9, 2010
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L15W10_MIC105_FunWithC1 - Lecture 15 MIC105 W10 Fun with C1...

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