16 - Proteobacteria

16 - Proteobacteria - Topic 16 Proteobacteria Phylogenetic...

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Topic 16 Proteobacteria
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Phylogenetic Tree Domain Bacteria Figure 17.1
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Proteobacteria Many of the most commonly encountered bacteria Metabolically diverse chemolithotrophs chemoorganotrophs phototrophs Morphologically diverse Five phylogenetic groups: α, β, γ, δ, ε Energy: CO 2 Carbon: Photoautotrophs Photoheterotrophs Organic C PHOTOTROPHS (use light as energy source) Alpha, Beta, Gamma, Delta, Epsilon Figure 20.1 12 th ed
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Proteobacteria named after Greek god Proteus
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Anoxygenic Photosynthesis Photosynthesis is inhibited by O 2 although some can grow aerobically Wavelengths determined by specific bacteriochlorophylls and carotenoids e.g. bcl a is blue Figure 17.3
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Photosynthetic Membranes Figure 17.4 Ectothiorhodospira mobilis Allochromatium vinosum lamellae flat sheets composed of invaginated internal membranes spherical vesicles spherical sheets composed of invaginated internal membranes
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Purple Sulfur Bacteria blooms Photoautotrophs of the Gammaproteobacteria oxidize H 2 S to S 0 during photosynthetic CO 2 reduction in anoxic lakewater stored in periplasm or outside cells, disappears when oxidized to sulfate Figure 17.6
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Purple Nonsulfur Bacteria Very low levels of H 2 S oxidation Photoheterotrophs (light energy,
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This note was uploaded on 12/23/2011 for the course BIOL 140 taught by Professor Dr.joshneufeld during the Fall '10 term at Waterloo.

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16 - Proteobacteria - Topic 16 Proteobacteria Phylogenetic...

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