Title |
Comparison of activity indexes for recognizing enzyme mutants of higher activity with uricase as model
|
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Published in |
BMC Chemistry, April 2013
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DOI | 10.1186/1752-153x-7-69 |
Pubmed ID | |
Authors |
Juan Feng, Hongbo Liu, Xiaolan Yang, Ang Gao, Juan Liao, Liping Feng, Jun Pu, Yanling Xie, Gaobo Long, Yuanli Li, Fei Liao |
Abstract |
For screening a library of enzyme mutants, an efficient and cost-effective method for reliable assay of enzyme activity and a decision method for safe recognition of mutants of higher activity are needed. The comparison of activity concentrations of mutants in lysates of transformed Escherichia coli cells against a threshold is unsafe to recognize mutants of higher activity due to variations of both expression levels of mutant proteins and lysis efficiency of transformed cells. Hence, by a spectrophotometric method after verification to measure uricase activity, specific activity calculated from the level of total proteins in a lysate was tested for recognizing a mutant of higher activity. |
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