Abstract
The anaerobic hyperthermophilic archaea Desulfurococcus amylolyticus, Hyperthermus butylicus, Thermococcus celer, Pyrococcus woesei, the hyperthermophilic bacteria Thermotoga maritima and Clostridium thermohydrosulfuricum and the aerobic mesophilic archaeon Halobacterium saccharovorum were grown either on complex media, on sugars or on pyruvate as carbon and energy sources. During growth acetate was formed as fermentation product by all organisms. The enzymes involved in acetyl-CoA formation from pyruvate and in acetate formation from acetyl-CoA were investigated:
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1.
Cell extracts of all species, both archaea and bacteria, catalyzed the coenzyme A-dependent oxidative decarboxylation of pyruvate with viologen dyes or with Clostridium pasteurianum ferredoxin as electron acceptors indicating a pyruvate: ferredoxin oxidoreductase to be operative in acetyl-CoA formation from pyruvate.
-
2.
Cell extracts of all archaeal species, both hyperthermophiles (D. amylolyticus, H. butylicus, T. celer, P. woesei) and the mesophile H. saccharovorum, contained an acetyl-CoA synthetase (ADP forming), which catalyzes both acetate formation from acetyl-CoA and ATP synthesis from ADP and phosphate (Pi): Acetyl-CoA+ADP+Pi⇌Acetate + ATP+CoA. Phosphate acetyltransferase and acetate kinase could not be detected.
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3.
Cell extracts of the hyperthermophilic (eu)bacteria T. maritima and C. thermohydrosulfuricum contained phosphate acetyltransferase and acetate kinase rather than acetyl-CoA synthetase (ADP forming).
These data indicate that acetyl-CoA synthetase (ADP forming) represents a typical archaeal property rather than an enzyme specific for hyperthermophiles. It is proposed that in all acetate forming archaea the formation of acetate and of ATP from acetyl-CoA, ADP and Pi are catalyzed by acetyl-CoA synthetase (ADP forming), whereas in all acetate forming (eu)bacteria these reactions are catalyzed by two enzymes, phosphate acetyltransferase and acetate kinase.
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Abbreviations
- DTE:
-
dithioerythritol
- Mes:
-
2-(N-morpholino)-ethane sulfonic acid
- Tris:
-
Tris-(hydroxymethyl)-aminomethane
- Tricine:
-
N-tris(hydroxymethyl)-methylglycine
- MV:
-
methylviologen
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Schäfer, T., Selig, M. & Schönheit, P. Acetyl-CoA synthetase (ADP forming) in archaea, a novel enzyme involved in acetate formation and ATP synthesis. Arch. Microbiol. 159, 72–83 (1993). https://doi.org/10.1007/BF00244267
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DOI: https://doi.org/10.1007/BF00244267