BIOL240 Chapter Notes -Purple Sulfur Bacteria, Alphaproteobacteria, Methane Monooxygenase
18 Mar 2013
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Other members: methanotrophs, pseudomonas type organisms, free-living aerobic nitrogen-fixing organisms, neisseria and its relatives, enteric bacteria. Proteobacteria divided into different groups phylogenetic groupings based on 16s rrna sequence. Ancestral phototroph delta purple, epsilon purple, gama purple, alpha purple and beta purple bacteria. Carry out anoxygenic photosynthesis no oxygen production. Oxygen inhibits photosynthesis only in anaerobic conditions. Colour determines which wavelengths of light it can best absorb. Phototrophs photoautotrophs (c = carbon dioxide) and photoheterotrophs (c = organic) H2s gas can be used as electron donor in co2 reduction process. All purple sulfur bacteria are members of gamma proteobacteria grouping. Some can carry out low level of h2s oxidation. Members of alpha and beta proteobacteria grouping. Organism capable of oxidizing methane as an electron donor in energy metabolism. Methylotroph: capable of oxidizing compounds like methanol. Methane c1 compound without c-c bond. Methane monooxygenase important enzyme used in conversion of methane to. Restricted in types of environments they can inhabit methanol.
