title: [Expression and application research of ochratoxin A mimotope by filamentous phage pVIII display system].
abstract: OBJECTIVE
  Traditional ochratoxin A(OTA) competitive antigen are high toxicity, high price and difficult preparation. Non-toxic and easy prepared OTA competitive antigen substitutes were expressed by recombinant filamentous phage which have OTA mimotope displayed on its p VI surface.
  
  
  METHODS
  Recombinant phagemid pC89-COTA which contain OTA mimotope nucleotide sequence was constructed. Moreover, to increase the binding rate of OTA mimotope with antibody, Enterokinase cleavage sits were led into 5' terminal of OTA mimotope nucleotide sequence. The pC89-COTA was transformed into E. coli XL1-blue. The E. coli XL1-blue were infected by wild KM13 phage and recombinant phage with OTA mimotope displayed generated.
  
  
  RESULTS
  OTA mimotope phage was successful expressed and OTA mimotope phage which digested by Enterokinase had significantly higher binding rate with antibody than phage which not digested by Enterokinase. Non-toxic OTA competitive ELISA was established by using this digested OTA mimotope phage, the detecting limitation was 100 microg/ml, the linear range of the inhibition curves was between 250 pg/ml and 1000 pg/ml. Spiked recoveries of the farina tritici blank samples, the recovery rate of OTA were 99.8% 112.3% and coefficients of variation were 8.19% 11.64%, then 16 commercially available samples were tested and the positive rate was 31.25%.
  
  
  CONCLUSIONS
  OTA mimotope phage were successfully expressed and non-toxic OTA competitive ELISA was established.
authors.affiliation: School of Life Science, Jiangxi Science and Technology Normal University, Nanchang 330013, China. link2windfall@hotmail.com
authors.forename: Xinglong
authors.initials: X
authors.lastname: Chen
authors.forename: Ling
authors.initials: L
authors.lastname: Xu
authors.forename: Renrong
authors.initials: R
authors.lastname: Liu
authors.forename: Xuemei
authors.initials: X
authors.lastname: Qiu
authors.forename: Lixin
authors.initials: L
authors.lastname: Zhu
mesh_terms: D000946:Antigens, Fungal / Q000276:immunology*; D001483:Base Sequence; D004765:Enteropeptidase / Q000235:genetics / Q000378:metabolism; D004797:Enzyme-Linked Immunosorbent Assay / Q000379:methods; D018604:Epitope Mapping; D000939:Epitopes / Q000276:immunology*; D005658:Fungi / Q000378:metabolism*; D018716:Molecular Mimicry / Q000235:genetics*; D008969:Molecular Sequence Data; D009793:Ochratoxins / Q000032:analysis* / Q000276:immunology; D019151:Peptide Library; D010957:Plasmids / Q000235:genetics; D011994:Recombinant Proteins / Q000235:genetics
chemical_list: D000946:Antigens, Fungal; D000939:Epitopes; D009793:Ochratoxins; D019151:Peptide Library; D011994:Recombinant Proteins; C025589:ochratoxin A; D004765:Enteropeptidase