title: Engineering a high-yield glutathione strain of Hansenula polymorpha using ion beam implantation.
abstract: To generate an industrial strain of Hansenula polymorpha capable of yielding greater levels of glutathione (GSH), wild strain H. polymorpha DL-1 cells were mutated using a nitrogen ion beam, a novel mutagen. At an energy level of 20 keV and dose of 2.13 × 10(16) ions/cm(2), H. polymorpha strain 28 (HP28) with a high-yield of GSH was screened. HP28 intracellular GSH levels reached 337.16 mg/L by ion beam implantation, 1.56 times greater than that of the wild type strain when the fermentation time was shortened from 48 hr to 42 hr, greatly improving efficiency and reducing the cost of industrial-scale production. The enhanced efficiency of HP28 is promising for GSH production from lignocellulosic materials. Therefore, the ion beam implantation would be a cost-effective alternative to the conventional mutation method for engineering yeast and improving its utility.
authors.affiliation: School of Life Science and Engineering, Shaanxi University of Science and Technology, Xi'an, PR China. qianwd@sust.edu.cn
authors.forename: Weidong
authors.initials: W
authors.lastname: Qian
authors.forename: Yunfang
authors.initials: Y
authors.lastname: Fu
authors.forename: Changlong
authors.initials: C
authors.lastname: Cai
mesh_terms: D005285:Fermentation; D005818:Genetic Engineering / Q000191:economics / Q000379:methods*; D005978:Glutathione / Q000096:biosynthesis* / Q000235:genetics; D007477:Ions; D016296:Mutagenesis; D009154:Mutation; D059645:Mutation Rate; D010843:Pichia / Q000235:genetics* / Q000378:metabolism*
chemical_list: D007477:Ions; D005978:Glutathione