title: [Preparation and purification of polyclonal antibody against Toxoplasma gondii rhoptry protein 2 (ROP2) and its application in immunofluorescence localization].
abstract: OBJECTIVE
  To prepare and purify polyclonal antibody against Toxoplasma gondii rhoptry protein 2 (ROP2) and apply it to immunofluorescence localization.
  
  
  METHODS
  The constructed recombinant plasmid pET32a-ROP2 was transformed into E. coli BL21 (DE3) and the protein was expressed under the condition of 0.5 mmol/L IPTG induction. Cells were lysed by multiple rounds of sonication to obtain supernatant and inclusion body, respectively. The washed inclusion bodies were dissolved in urea. New Zealand White rabbits were immunized with 200 microg purified recombinant ROP2 mixing with the same volume of Freund's adjuvant for 3 times at interval of 14 days and 19 days, respectively. Rabbit serum was collected at 10 days after the last immunization. Polyclonal antibody in rabbit serum was purified with HiTrap Protein G HP affinity purification column. Indirect ELISA and Western blotting were used to detect antibody titer and specificity of polyclonal antibody against the recombinant ROP2. The polyclonal antibody was used to the localization of ROP2 on the parasitophorous vacuole membrane in human foreskin fibroblasts infected by Toxoplasma tachyzoites by the immunofluorescence method.
  
  
  RESULTS
  The recombinant ROP2 protein was obtained and specific rabbit-derived polyclonal antibody was prepared. Indirect ELISA confirmed that the rabbit-derived polyclonal antibody titer reached 1:102400, and the recombinant ROP2 protein was recognized by specific polyclonal antibody. Immunofluorescence localization test showed that the ROP2 protein was located on the parasitophorous vacuole membrane.
  
  
  CONCLUSIONS
  The rabbit-derived polyclonal antibody against ROP2 is prepared, and used in immunofluorescence localization of ROP2 on parasitophorous vacuole membrane.
authors.forename: Li
authors.initials: L
authors.lastname: Zhang
authors.forename: Qi-Bin
authors.initials: QB
authors.lastname: Liao
authors.forename: Lin
authors.initials: L
authors.lastname: Hu
authors.forename: Ai-Yuan
authors.initials: AY
authors.lastname: Chen
authors.forename: Hai-Xia
authors.initials: HX
authors.lastname: Wei
authors.forename: Hong-Juan
authors.initials: HJ
authors.lastname: Peng
mesh_terms: D000818:Animals; D000913:Antibodies, Protozoan / Q000276:immunology*; D015153:Blotting, Western; D004926:Escherichia coli; D005455:Fluorescent Antibody Technique; D006801:Humans; D007114:Immunization; D008565:Membrane Proteins / Q000276:immunology / Q000302:isolation & purification*; D010957:Plasmids; D015800:Protozoan Proteins / Q000276:immunology / Q000302:isolation & purification*; D011817:Rabbits; D011994:Recombinant Proteins; D014122:Toxoplasma / Q000737:chemistry*
chemical_list: D000913:Antibodies, Protozoan; D008565:Membrane Proteins; D015800:Protozoan Proteins; C090555:ROP 2 protein, Toxoplasma gondii; D011994:Recombinant Proteins