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Abstract. The pyruvate carboxylase (PYC) of the hyperthermophilic, strictly hydrogenotrophic, autotrophic and marine methanarchaeon Methanococcus jannaschii was purified to homogeneity. Optimal activity was at pH8.5, 80C, and a KCl concentration of 0.175M. This enzyme is the most thermophilic PYC so far studied. Unlike the Methanobacterium thermoautotrophicum enzyme, Mc. jannaschii PYC was expressed...