Sulfur Reduction by the Extremely Thermophilic Archaebacterium
            <i>Pyrodictium occultum</i>

Parameswaran, A. K.; Provan, C. N.; Sturm, F. J.; Kelly, Robert M.

doi:10.1128/aem.53.7.1690-1693.1987

Cited by 13 publications

(1 citation statement)

References 5 publications

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“…Although the extract could have supplied some nutrition.~l factor, it appeared to act as a wetting agent, causing the S ° to become more hydrophilic and finely dispersed, presumably promoting the interaction of the bacteria with the insoluble growth substrate [21]. Similar results have been reported by Kelly and co-workers [52,53] who also monitored the production and utilization of gases during the growth of P. brockii. Strangely, although no growth was observed in the absence of H2 or CO 2 (in the presence of yeast extract), the amounts of H2S produced on H2/S ° did not parallel cell growth and continued at a high rate during the stationary phase.…”

Section: The Roles Of H 2 In the Metabolism Of The Extremely Thermophsupporting

confidence: 77%

The metabolism of hydrogen by extremely thermophilic, sulfur-dependent bacteria

Adams

1990

FEMS Microbiology Letters

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In just the last few years, a group of bacteria have been discovered that have the remarkable property of growing near and above 100°C. These extremely thermophilic organisms, defined here as having the ability to grow at 90°C with optimum growth at 80°C and above, have been isolated mainly from sulfur‐rich, marine geothermal environments, both shallow and deep sea. They comprise over a dozen different genera, and except for one novel eubacterium, all may be classified as archaebacteria. The majority of the extremely thermophilic genera metabolize elemental sulfur (S°) and a survey of the various organisms reveals that most of them also depend upon the oxidation of hydrogen gas (H2) as an energy source. In addition, two extremely thermophilic genera are known that actively produce H2 as end‐products of novel fermentative metabolisms. The enzyme hydrogenase, which is responsible for catalysing H2 activation and H2 production, appears to play several roles in electron and energy transfer during the growth of these organisms. Hydrogenase has so far been purified from only one extremely thermophilic species, from Pyrococcus furiosus (Topt = 100°C), and hydrogenase activity has been exmained in cell‐free extracts of only a few others. However, a comparison of their properties with those of hydrogenases from mesophilic bacteria suggests that (a) the hydrogenase responsible for catalysing H2 oxidation in extremely thermophilic organisms may be an extremely thermostable version of the mesophilic enzyme, and (b) a new type of ‘evolution’ hydrogenase, lacking the Ni‐S or Fe‐S catalytic sites of the mesophilic enzymes, is required for catalysing H2 evolution at temperatures near and above 100°C.

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Section: The Roles Of H 2 In the Metabolism Of The Extremely Thermophsupporting

confidence: 77%

The metabolism of hydrogen by extremely thermophilic, sulfur-dependent bacteria

Adams

1990

FEMS Microbiology Letters

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Thermophilic Microorganisms

Hicks¹,

Kelly²

1999

Encyclopedia of Bioprocess Technology

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Microorganisms: Extremely Thermophilic

Gray

Adams

Kelly

2009

Encyclopedia of Industrial Biotechnology

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Extremely thermophilic microorganisms ( T opt ≥ 70°C) are found in geographically diverse marine and terrestrial environments and represent a wide range of growth physiologies. Extreme thermophiles thrive at high temperatures and, as such, different approaches must be taken to cultivate them in laboratory settings. Genome sequences of many extreme thermophiles have been completed and offer a glimpse into the basis for their high temperature life styles. A number of biotechnological applications have been envisioned that take strategic advantage of their thermophilicity, including the production of biohydrogen and recovery of base and precious metals from ores. As genetic systems are developed and implemented for extreme thermophiles, metabolic engineering approaches will be possible to tune the unique characteristics of these microorganisms for bioprocessing uses.

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Sulfur Reduction by the Extremely Thermophilic Archaebacterium Pyrodictium occultum

Cited by 13 publications

References 5 publications

The metabolism of hydrogen by extremely thermophilic, sulfur-dependent bacteria

The metabolism of hydrogen by extremely thermophilic, sulfur-dependent bacteria

Thermophilic Microorganisms

Microorganisms: Extremely Thermophilic

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