Sulerythrin,the smallest member of the rubrerythrin family,from a strictly aerobic and thermoacidophilic archaeon,Sulfolobus tokodaii strain 7 |
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Authors: | Wakagi Takayoshi |
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Institution: | Department of Biotechnology, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-8657, Japan. atwakag@mail.ecc.u-tokyo.ac.jp |
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Abstract: | A protein corresponding to the N-terminal domain of rubrerythrin was isolated from a strictly aerobic archaeon, Sulfolobus tokodaii strain 7. The molecular mass was found to be 15.8 kDa by sodium dodecyl sulfate-polyacrylamide gel electrophoresis, 16278 Da by time-of-flight mass spectrometry and 34.5 kDa by gel filtration chromatography, suggesting that the protein is dimeric. Two mol iron and 1-2 mol zinc mol(-1) protein were detected. On addition of the azide ion, the absorption spectrum was greatly affected. The far UV circular dichroism spectrum suggested that the protein was mostly composed of alpha-helices. The N-terminal sequence completely matched the open reading frame, st2370, recently found on genome analysis of the organism. The protein was homologous to rubrerythrin but lacked a C-terminal rubredoxin domain. It was found in the genus Sulfolobus and therefore named sulerythrin; it is the smallest and first aerobic member of the rubrerythrin family. |
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Keywords: | Sulerythrin Rubrerythrin Archaeon Sulfolobus |
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