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Key Role for Sulfur in Peptide Metabolism and in Regulation of Three Hydrogenases in the Hyperthermophilic Archaeon Pyrococcus furiosus
- Publication Year :
- 2001
- Publisher :
- American Society for Microbiology, 2001.
-
Abstract
- The hyperthermophilic archaeon Pyrococcus furiosus grows optimally at 100°C by the fermentation of peptides and carbohydrates. Growth of the organism was examined in media containing either maltose, peptides (hydrolyzed casein), or both as the carbon source(s), each with and without elemental sulfur (S 0 ). Growth rates were highest on media containing peptides and S 0 , with or without maltose. Growth did not occur on the peptide medium without S 0 . S 0 had no effect on growth rates in the maltose medium in the absence of peptides. Phenylacetate production rates (from phenylalanine fermentation) from cells grown in the peptide medium containing S 0 with or without maltose were the same, suggesting that S 0 is required for peptide utilization. The activities of 14 of 21 enzymes involved in or related to the fermentation pathways of P. furiosus were shown to be regulated under the five different growth conditions studied. The presence of S 0 in the growth media resulted in decreases in specific activities of two cytoplasmic hydrogenases (I and II) and of a membrane-bound hydrogenase, each by an order of magnitude. The primary S 0 -reducing enzyme in this organism and the mechanism of the S 0 dependence of peptide metabolism are not known. This study provides the first evidence for a highly regulated fermentation-based metabolism in P. furiosus and a significant regulatory role for elemental sulfur or its metabolites.
- Subjects :
- Cytoplasm
Hydrogenase
Physiology and Metabolism
Sulfur metabolism
Peptide
Biology
Microbiology
Gene Expression Regulation, Enzymologic
chemistry.chemical_compound
Molecular Biology
Peptide Metabolism
chemistry.chemical_classification
Membrane Proteins
Maltose
biology.organism_classification
Culture Media
Pyrococcus furiosus
Enzyme
chemistry
Biochemistry
Fermentation
Gene Expression Regulation, Archaeal
Peptides
Glycolysis
Oxidation-Reduction
Sulfur
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....08aabc9cc9297fe706bf4644ba479532