Isolation, Characterization and Autotrophic Metabolism of a Moderately Thermophilic Carboxydobacterium, Pseudomonas thermocarboxydovorans sp. nov.

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Abstract
Three strains of Gram-negative, obligately aerobic, moderately thermophilic, CO-utilizing bacteria have been isolated by enrichment at 45-55 °C in mineral medium under CO, H2 and air. The properties of the strains, designated C2, SI and FE, suggest that they should be included in a single species that we have named Pseudomonas thermocarboxydovorans. The isolates can grow on CO and a limited range of organic and amino acids; neither sugars nor H2/CO2 support growth and H2 is not oxidized. Strain C2 contains a soluble, inducible CO. phenazine etho-sulphate oxidoreductase, lacks hydrogenase and assimilates CO via ribulose bisphosphate carboxylase. The organism apparently contains a mechanism for assimilating phospho-glycollate.

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