Abstract
Truncated form of UBP1, an ubiquitin-specific protease ofSaccharomyces cerevisiae, was overexpressed inEscherichia coli. The hexahistidine residue (His6) was fused to the N-terminus of truncated UBP1 and the corresponding recombinant protein was purified with high yield by immobilized metal affinity chromatography. The truncated form of UBP1 protein was functional to cleave ubiquitinated human growth hormone as substrate. Effects of pH and temperature were investigated in order to optimize deubiquitinating reactions for the truncated UBP1. Optimum temperature and pH for the cleavage reaction were 40°C and pH 8.0, respectively.
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