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- W4324309905 abstract "Sulfide-dependent THI4 thiazole synthases could potentially be used to replace plant cysteine-dependent suicide THI4s, whose high protein turnover rates make thiamin synthesis exceptionally energy-expensive. However, sulfide-dependent THI4s are anaerobic or microoxic enzymes and hence unadapted to the aerobic conditions in plants; they are also slow enzymes (kcat < 1 h-1). To improve aerotolerance and activity, we applied continuous directed evolution under aerobic conditions in the yeast OrthoRep system to two sulfide-dependent bacterial THI4s. Seven beneficial single mutations were identified, of which five lie in the active-site cleft predicted by structural modeling and two recapitulate features of naturally aerotolerant THI4s. That single mutations gave substantial improvements suggests that further advance under selection will be possible by stacking mutations. This proof-of-concept study established that the performance of sulfide-dependent THI4s in aerobic conditions is evolvable and, more generally, that yeast OrthoRep provides a plant-like bridge to adapt nonplant enzymes to work better in plants." @default.
- W4324309905 created "2023-03-16" @default.
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- W4324309905 date "2023-03-15" @default.
- W4324309905 modified "2023-10-10" @default.
- W4324309905 title "Directed Evolution of Aerotolerance in Sulfide-Dependent Thiazole Synthases" @default.
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- W4324309905 doi "https://doi.org/10.1021/acssynbio.2c00512" @default.
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