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The hyperthermophilic archaebacterium Pyrococcus furiosus produces several amylolytic enzymes in response to the presence of complex carbohydrates in the growth medium. These enzyme activities, alpha-glucosidase, pullulanase, and alpha-amylase, were detected in both cell extracts and culture supernatants. All activities were characterized by temperature optima of at least 100 degrees C as well as a high degree of thermostability. The existence of this collection of activities in P. furiosus suggests that polysaccharide availability in its growth environment is a significant aspect of the niche from which it was isolated.

Characterization of Amylolytic Enzyme Activities Associated with the Hyperthermophilic Archaebacterium Pyrococcus furiosus