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A glycerate kinase (GK) gene (PH0495) from the hyperthermophilic archaeon Pyrococcus horikoshii, was cloned and expressed in Escherichia coli. The recombinant protein was purified to homogeneity by affinity chromatography and ion exchange chromatography. The enzyme was likely a homodimer based on SDS-PAGE (47 kDa) and gel filtration chromatography (100 kDa) analysis. A radioisotope-labeling examination...
An exo-β-d-glucosaminidase gene (PH0511) was cloned from the hyperthermophilic archaeon, Pyrococcus horikoshii, and expressed in Escherichia coli. The purified protein showed a strong exo-β-d-glucosaminidase activity by TLC analysis. DTT (50 mM) had little effect on its homodimeric structure during SDS-PAGE. The enzyme was optimally active at 90°C (over 20 min) and pH 6. It had a half-life of 9 h...
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