The deficient carbohydrate metabolic pathways and the incomplete tricarboxylic acid cycle in an obligately autotrophic hydrogen-oxidizing bacterium.
- 1 January 1982
- journal article
- Published by Oxford University Press (OUP) in Agricultural and Biological Chemistry
- Vol. 46 (9) , 2341-2345
- https://doi.org/10.1271/bbb1961.46.2341
Abstract
The activities of enzymes of carbohydrate metabolism, enzymes of the tricarboxylic acid cycle and some related enzymes were measured in cell-free extracts of strain TK-6, an extremely thermophilic, obligately autotrophic, aerobic hydrogen-oxidizing bacterium. Activities of phosphofructokinase, aldolase, pyruvate kinase, 6-phosphogluconate dehydrase and 2-keto-3-deoxy-6-phosphogluconate aldolase, key enzymes of the Embden-Meyerhof and the Entner-Doudoroff pathways were not found in the extracts. All of the tricarboxylic acid cycle enzymes except α-ketoglutarate dehydrogenase, and reduced nicotinamide adenine dinucleotide oxidase were present. These metabolic defects are considered to be one of the reasons for the obligate autotrophy of strain TK-6.Keywords
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