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- W2098083542 abstract "The genome of the hyperthermophilic archaeon Thermococcus kodakaraensis contains three genes encoding subtilisin-like serine proteases, Tk-1689, Tk-0076 and Tk-subtilisin. Of them, the structure and function of Tk-subtilisin have been extensively studied. To examine whether Tk-1689 is matured to an active form and functions as a hyperthermostable protease as is Tk-subtilisin, the gene encoding the Tk-1689 derivative without a putative N-terminal signal sequence, termed Pro-Tk-SP, was overexpressed in Escherichia coli. Pro-Tk-SP is composed of 640 amino acid residues and its molecular mass is 68.6 kDa. The recombinant protein was purified, however, as an active 44 kDa protease, termed Tk-SP, which lacks the N-terminal 113 and C-terminal 101 amino acid residues. This result suggests that Pro-Tk-SP consists of an N-terminal propeptide (Ala1–Ala113), a mature domain (Tk-SP, Val114–Val539) and a C-terminal propeptide (Asp540–Gly640). Like Tk-subtilisin, Tk-SP showed a broad substrate specificity and was highly thermostable. Its optimum temperature for activity was ∼100°C and its half-life at 100°C was 100 min. It was fully resistant to treatment with 5% SDS, 8 M urea or 10% Triton X-100. However, unlike Tk-subtilisin and bacterial subtilisins, Tk-SP requires neither Ca2+ nor propeptide for folding. As a result, Tk-SP was fully active even in the presence of 10 mM EDTA. Thus, Tk-SP has a great advantage over other proteases in high resistance to heat, denaturants, detergents and chelating agents and therefore has great potential for application in biotechnology fields." @default.
- W2098083542 created "2016-06-24" @default.
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- W2098083542 date "2010-01-25" @default.
- W2098083542 modified "2023-10-12" @default.
- W2098083542 title "Subtilisin-like serine protease from hyperthermophilic archaeon Thermococcus kodakaraensis with N- and C-terminal propeptides" @default.
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- W2098083542 doi "https://doi.org/10.1093/protein/gzp092" @default.
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