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The two genes encoding the constituent subunits of the Thermoplasma acidophilum proteasome were expressed in Escherichia coli yielding fully assembled molecules as shown by electron microscopy. The recombinant proteasomes were purified to homogeneity and ware shown to have proteolytic activity indistinguishable from proteasomes isolated from T. acidophilum.
The gene encoding the α-subunit of the proteasome from Thermoplasma acidophilum was cloned and sequenced. The gene encodes for a polypeptide with 233 amino acid and reduces a calculated molecular weight of 25870. Sequence similarity of the α-subunit with the Saccharomyces cerevislae wild-type suppressor gene sell* encoded polypeptide, which is probably identical with the subunit YC7-α of the yeast...
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