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• W4214491221 endingPage "106076" @default.
• W4214491221 startingPage "106076" @default.
• W4214491221 abstract "Producing recombinant proteins with incorporated selenomethionine (SeMet) facilitates solving X-ray crystallographic structures of novel proteins. Production of SeMet labeled proteins in the yeast Pichia pastoris (syn. Komagataella phaffii) is difficult because SeMet is mildly toxic, reducing protein expression levels. To counteract this yield loss for a novel protease, Epicoccum sorghi chitinase modifying protein (Es-cmp), a novel disease promoting protease secreted by these plant pathogenic fungi, we isolated a yeast strain that secreted more protein. By comparing the expression level of 48 strains we isolated one that produced significantly more protein. This strain was found to be gene dosed, having four copies of the expression cassette. After optimization the strain produced Es-cmp in defined media with SeMet at levels nearly equal to that of the original strain in complex media. Also, we produced SeMet labeled protein for a homologous protease from the fungus Fusarium vanettenii, Fvan-cmp, by directly selecting a gene dosed strain on agar plates with increased zeocin. Linearization of plasmid with PmeI before electroporation led to high numbers of 1 mg/mL zeocin resistant clones with significantly increased expression compared to those selected on 0.1 mg/mL. The gene dosed strains expressing Es-cmp and Fvan-cmp allowed production of 8.5 and 16.8 mg of SeMet labeled protein from 500 mL shake flask cultures. The results demonstrate that selection of P. pastoris expression strains by plating after transformation on agar with 1 mg/mL zeocin rather than the standard 0.1 mg/mL directly selects gene dosed strains that can facilitate production of selenomethionine labeled proteins." @default.
• W4214491221 created "2022-03-02" @default.
• W4214491221 creator A5009252323 @default.
• W4214491221 creator A5068847247 @default.
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• W4214491221 date "2022-06-01" @default.
• W4214491221 modified "2023-09-28" @default.
• W4214491221 title "Production of selenomethionine labeled polyglycine hydrolases in Pichia pastoris" @default.
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• W4214491221 doi "https://doi.org/10.1016/j.pep.2022.106076" @default.
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