title: Large-scale purification and acute toxicity of hygromycin B phosphotransferase.
abstract: OBJECTIVE
  To provide the acute toxicity data of hygromycin B phosphotransferase (HPT) using recombinant protein purified from E. coli.
  
  
  METHODS
  Recombinant HPT protein was expressed and purified from E. coli. To exclude the potential adverse effect of bacteria protein in recombinant HPT protein, bacterial control plasmid was constructed, and bacteria control protein was extracted and prepared as recombinant HPT protein. One hundred mice, randomly assigned to 5 groups, were administrated 10 g/kg, 5 g/kg, or 1 g/kg body weight of HPT or 5 g/kg body weight of bacterial control protein or phosphate-buffered saline (PBS) respectively by oral gavage.
  
  
  RESULTS
  All animals survived with no significant change in body weight gain throughout the study. Macroscopic necropsy examination on day 15 revealed no gross pathological lesions in any of the animals. The maximum tolerated dose (MTD) of HPT was 10 g/kg body weight in mice and could be regarded as nontoxic.
  
  
  CONCLUSIONS
  HPT protein does not have any safety problems to human health.
authors.affiliation: Institute for Nutrition and Food Safety, Chinese Center for Disease Control and Prevention, Beijing 100050, China.
authors.forename: Qin
authors.initials: Q
authors.lastname: Zhuo
authors.forename: Jian-Hua
authors.initials: JH
authors.lastname: Piao
authors.forename: Yuan
authors.initials: Y
authors.lastname: Tian
authors.forename: Jie
authors.initials: J
authors.lastname: Xu
authors.forename: Xiao-Guang
authors.initials: XG
authors.lastname: Yang
mesh_terms: D000818:Animals; D001426:Bacterial Proteins / Q000302:isolation & purification / Q000633:toxicity*; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism; D005260:Female; D008297:Male; D051379:Mice; D008815:Mice, Inbred Strains; D017853:Phosphotransferases (Alcohol Group Acceptor) / Q000302:isolation & purification / Q000633:toxicity*; D011994:Recombinant Proteins / Q000302:isolation & purification / Q000633:toxicity*; D023382:Toxicity Tests, Acute
chemical_list: D001426:Bacterial Proteins; D011994:Recombinant Proteins; D017853:Phosphotransferases (Alcohol Group Acceptor); C063242:hygromycin-B kinase