Hyperthermophilic archaebacteria

A large number of hyperthermophilic Archaebacteria, especially the deep sea Thermococcale and Sulfolobus species elaborate a-amylases.79-82 Many have been cloned and sequenced.78 Pyrococcus furiosus,83,84 Thermococcus profundus,85 Thermococcus hydrothermalis,78 Sulfolobus solfataricus and Sulfolobus acidocaldar-iusS6 secrete thermophilic a-amylases. The a-amylases of all of these organisms have optimal enzyme activity at 90°C or higher and often only begin to show activity at 40°C or 50°C. Pyrococcus furiosus secretes an a-amylase with an optimum temperature of 100°C and a maximum temperature of 140°C.87 The optimum pH values vary between 5 and 9. Table 7.1 summarizes the names of the organisms, the optimum temperature, and optimum pH values for several of these enzymes. 

Linear DNA molecules are denatured in vitro when they are exposed to current growth temperatures of hyperthermophilic archaebacteria. Accordingly, it is often... 

See also 3,5-Dimethyl-1,2,4-trithiolane, D-03306 for lowest homologue. Components prod, by the sulfur-metabolising hyperthermophilic archaebacteria Thermococcus acidaminovorans and T. tadjuricus. 3-Ethyl-5-methyl-l,2,4-trithiolane [116505-59-0]... 

Prod, by the sulfur-metabolising hyperthermophilic archaebacteria Thermococcus acidaminovorans and T. tadjuricus. Solid. Mp 123°. 

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