[No authors listed]
Diastereoselectivity-enhanced mutants of L: -threonine aldolase (L: -TA) for L: -threo-3,4-dihydroxyphenylserine (L: -threo-DOPS) synthesis were isolated by error-prone PCR followed by a high-throughput screening. The most improved mutant was achieved from the mutant T3-3mm2, showing a 4-fold increase over the wild-type L: -TA. When aldol condensation activity was examined using whole cells of T3-3mm2, its de was constantly maintained at 55% during the batch reactions for 80 h, yielding 3.8 mg L: -threo-DOPS/ml.
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