Abstract
Abstract Citrate synthase from the thermoacidophilic archaebacterium Sulfolobus acidocaldarius was purified 365-fold to electrophoretic homogeneity. At 40 °C and pH 8.1 the homogeneous enzyme shows a specific activity of 73 units per mg, which corresponds to a turnover number of 44 sec-1. Citrate synthase from S. acidocaldarius shows pro-S stereospecificity, as is found with a partially purified preparation of the enzyme from Thermoplasma acidophilum, another thermoacidophilic archaebacterium.
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