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Connaris, H. et al.

Connaris, West, Hough, Danson,

Cloning and overexpression in Escherichia coli of the gene encoding citrate synthase from the hyperthermophilic Archaeon Sulfolobus solfataricus.

The citrate synthase ( CS) gene from the hyperthermophilic Archaeon Sulfolobus solfataricus has been cloned and sequenced. The gene encodes a polypeptide of 378 amino acids with a calculated polypeptide molecular mass of 42679. High-level expression was achieved in Escherichia coli and the recombinant citrate synthase was purified to homogeneity using a heat step and dye-ligand affinity chromatography. This procedure yielded approximately 26 mg of pure CS per liter of culture, with a specific activity of 41 U/mg. The enzyme exhibited a half-life of 8 min at 95 degrees C. A homology-modelled structure of the S. solfataricus CS has been generated using the crystal structure of the enzyme form the thermoacidophilic Archaeon Thermoplasma acidophilum with which it displays 58% sequence identity. The modelled structure is discussed with respect to the thermostability properties of the enzyme.[1]

References

Cloning and overexpression in Escherichia coli of the gene encoding citrate synthase from the hyperthermophilic Archaeon Sulfolobus solfataricus. Connaris, H., West, S.M., Hough, D.W., Danson, M.J. Extremophiles (1998) [Pubmed]

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