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- W2101478908 abstract "This study describes a modified colorimetric assay for uricase activity in flexible 96-well microtiter plates using the uricase/uric acid/horseradish peroxidase/4-aminoantipyrine/3,5-dichloro-2-hydroxybenzene sulfonate colorimetric reaction. The utility of this assay was demonstrated in a screen for mutant uricase enzymes derived from the uricase gene of the thermophilic bacterium Bacillus subtilis by a modified staggered extension process (StEP) mutagenesis. An Escherichia coli library of StEP-derived uricase mutant clones was screened yielding two identical active mutant uricase genes. Two motifs conserved in eukaryotic and prokaryotic uricases are highly conserved in the mutant uricase. The mutant uricase protein was found to exhibit high uricase activity (13.1 U·mg−1). Finally, the modified colorimetric method is much more efficient than the conventional ones and greatly reduces assay time from 4 days to less than 20 h." @default.
- W2101478908 created "2016-06-24" @default.
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- W2101478908 date "2004-02-01" @default.
- W2101478908 modified "2023-09-27" @default.
- W2101478908 title "Modified colorimetric assay for uricase activity and a screen for mutant Bacillus subtilis uricase genes following StEP mutagenesis" @default.
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- W2101478908 doi "https://doi.org/10.1046/j.1432-1033.2003.03951.x" @default.
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