Microbiology and Biochemistry of Strict Anaerobes Involved in Interspecies Hydrogen Transfer pp 53-73 | Cite as
The Hydrogenases of Sulfate-Reducing Bacteria : Physiological, Biochemical and Catalytic Aspects
Abstract
Three metabolic groups of bacteria are involved in the anaerobic degradation of complex organic materials into methane (1). Fermentative bacteria hydrolyze lipids, protein and polysaccharides and ferment most products with excretion of acetate, saturated fatty acids, hydroxyacids, alcohols, CO2 and H2 as major endproducts. A second group, termed H2-producing acetogenic bacteria,transform these endproducts into H2, acetate and CO2. Finally, methanogenic bacteria generate methane and CO2. The acetogenic and methanogenic bacteria grow in syntrophic associations through the process of interspecies H2 transfer, and some acetogenic bacteria can only be cultured in the presence of hydrogen-utilizing microorganisms (1–4) (Figure 1). The H2-producing acetogenic bacteria include some of the sulfate-reducing bacteria (2,3) and the species of obligate syntrophes isolated from cocultures (5–11).
Keywords
Methanogenic Bacterium Desulfovibrio Desulfuricans Uptake Hydrogenase Acetogenic Bacterium Sole Energy SourcePreview
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