Effect of Organic Compoundson the Growth of an Obligately Autotrophic Hydrogen-Oxidizing Bacterium, Hydrogenobacter thermophilus TK-6

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In the cell-free extracts and intact cells of an obligately autotrophic, extremely thermophilic, aerobic hydrogen-oxidizing bacterium, Hydrogenobacter thermophilus TK-6, eleven different organic compounds tested were only slightly oxidized compared with NADH or H2. Glucose acetate and pyruvate could be incorporated into intact cells of strain TK-6 only in the presence of hydrogen and oxygen in an atmosphere. These two findings, both weak oxidation of organic compounds and the requirement of energy for incorporation of organic compounds, presented a partial explanation for the obligate autotrophy of Hydrogenobacter thermophilus TK-6. The addition of a small amount of pyruvate, acetate and malate to the medium, stimulated the autotrophic growth of this strain, which suggests that these three compounds mayplay important roles in the carbon metabolismof the strain.
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