title: Diastereoselective synthesis of L: -threo-3,4-dihydroxyphenylserine by low-specific L: -threonine aldolase mutants.
abstract: 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.
authors.affiliation: Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute, 1266 Jeongeup, Jeonbuk, 580-185, Republic of Korea.
authors.forename: Hui-Jeong
authors.initials: HJ
authors.lastname: Gwon
authors.forename: Sang-Ho
authors.initials: SH
authors.lastname: Baik
mesh_terms: D001426:Bacterial Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D015103:Droxidopa / Q000737:chemistry / Q000378:metabolism*; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism; D012696:Glycine Hydroxymethyltransferase / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D015394:Molecular Structure; D016297:Mutagenesis, Site-Directed; D009154:Mutation; D016133:Polymerase Chain Reaction; D048372:Streptomyces coelicolor / Q000201:enzymology
chemical_list: D001426:Bacterial Proteins; D012696:Glycine Hydroxymethyltransferase; D015103:Droxidopa