Table I. Cloned thermophilic enzymes and their sources.

Enzyme	Source	Optimal temperature (°C)
α-Amylases	Pyrococcus furiosus	100
	Thermococcus profundus	80
Pullulanases	Fervidobacterium pennavorans	85
	Thermotaga maritima	90
	Pyrococcus wosei	100
	Pyrococcus furiosus	105
Endoglucanase	Thermotaga neapolitana	106
	Anaerocellum thermophilum	95
	Pyrococcus furiosus	100
β-glucosidase	Pyrococcus furiosus	102–105
	Thermotaga maritima	75
Proteases	Pyrococcus furiosus	85
	Thermococcus stetteri	85
	Sulfolobus acidocaldarius	90
Bacterial DNA polymerases	Thermus aquaticus (Taq)
	Thermus thermophilus (Tth)
	Thermotaga maritima (Tma)
Archaeal DNA polymerases	Pyrococcus wosei (Pwo)
	Pyrococcus furiosus (Pfu)
	Thermococcus litoralis (Vent)
Glucose isomerase	Thermus flavus	90
	Thermoanaerobacterium	80
	Thermotaga neapolitana	95
Alcohol-dehydrogenase	Thermoanaerobacterium ethanolicus	90
	Sulfolobus solfataricus	95
Esterase	Pyrococcus furiosus	100