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J. Bacteriol., Jul 1997, 4433-4437, Vol 179, No. 13
D Li and KJ Stevenson
An NADP(H)-dependent alcohol dehydrogenase was isolated from the
hyperthermophilic archaeon Thermococcus strain AN1. This enzyme is a
homotetramer with a subunit molecular weight of 46,700. The enzyme oxidizes
a series of primary linear alcohols but not methanol. The pH and
temperature optima with ethanol as the substrate are 6.8 to 7.0 and 85
degrees C, respectively. The enzyme readily reduced acetaldehyde with NADPH
as the cofactor. The gene encoding this enzyme has been cloned and
sequenced. An open reading frame of 1,218 bp, starting with ATG and ending
with TGA, was identified and corresponded to 406 amino acids. Sequence
comparisons show that this Thermococcus strain AN1 enzyme has significant
homologies with enzymes from the newly defined type III alcohol
dehydrogenase family. Thermococcus strain AN1 alcohol dehydrogenase is the
first archaeal enzyme belonging to this family.
Copyright © 1997, American Society for Microbiology
Purification and sequence analysis of a novel NADP(H)-dependent type III alcohol dehydrogenase from Thermococcus strain AN1
Department of Biological Sciences, The University of Calgary, Alberta, Canada.
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