The Journal of Biochemistry
Online ISSN : 1756-2651
Print ISSN : 0021-924X
Alkyl Hydroperoxide Reductase Dependent on Thioredoxin-Like Protein from Pyrococcus horikoshii
Yasuhiro KashimaKazuhiko Ishikawa
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2003 Volume 134 Issue 1 Pages 25-29

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Abstract
Pyrococcus horikoshii is an obligate anaerobic hyperthermophilic archaeon. In P. horikoshii cells, a hydroperoxide reductase homologue ORF (PH1217) was found to be induced by oxygen. The recombinant protein, which was expressed in E. coli under aerobic conditions, exhibited no activity. However, the recombinant protein prepared under semi-anaerobic conditions exhibited alkyl hydroperoxide reductase activity. Furthermore, it was clarified that it was coupled with the thioredoxin-like system in P. horikoshii. Western blot analysis revealed that the protein was induced by oxygen and hydrogen peroxide. This protein seems to be sensitive to oxygen but forms a thioredoxin-dependent system to eliminate reactive oxygen species in P. horikoshii.
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