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A DNA fragment encoding the DNA-binding domain (amino acids 1-60) of the Escherichia coli fru transcriptional regulator was cloned into the pGEX-KT vector and expressed in frame with the fused gene encoding glutathione S-transferase. The fusion protein was purified to homogeneity by affinity chromatography on immobilized glutathione, and then cleaved with thrombin. After separation by a cation-exchange...
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