Abstract
The gene encoding a family-57-like α-amylase in the hyperthermophilic archaeonMethanococcus jannaschii, has been cloned intoEscherichia coli. Extremely thermoactive α-amylase was confirmed in partially purified enzyme solution of the recombinant culture. This enzyme activity had a temperature optimum of 120°C and a pH optimum 5.0–8.0. The amylase activity is extremely stable against denaturants. Hydrolysis of large sugar polymers with α-1–6 and α-1–4 linkages yields products including glucose polymers of 1–7 units. Highest activity is exhibited on amylose. The catalyst exhibited a half-life of 50 h at 100°C, among the highest reported thermostabilities of natural amylases.
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Kim, J.W., Flowers, L.O., Whiteley, M. et al. Biochemical confirmation and characterization of the family-57-like α-amylase ofMethanococcus jannaschii . Folia Microbiol 46, 467–473 (2001). https://doi.org/10.1007/BF02817988
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DOI: https://doi.org/10.1007/BF02817988