title: [Expression and antigenicity analysis of NTPase gene of Toxoplasma gondii].
abstract: OBJECTIVE
  To clone and express prokaryotic recombinant plasmid of nucleoside triphosphate hydrolase (NTPase) gene of Toxoplasma gondii, and analyze its antigenicity.
  
  
  METHODS
  NTPase gene was amplified by PCR from RH strain of T. gondii and cloned into pGEM-T Easy vector. Positive clones were screened and identified by BglII, HindIII digestion and sequenced. The target gene was then subcloned into prokaryotic expression vector pBAD-HisB and transformed into E. coli BL21 (DE3). The expressed recombinant protein was purified with Ni-NTA agarose and further analyzed by sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) and Western blotting.
  
  
  RESULTS
  NTPase-II gene was specifically amplified, and the homology of DNA sequence was 100% to that in the GenBank. SDS-PAGE showed that the recombinant NTPase protein with correct molecular weight was expressed highly in E.coli BL21 (DE3). Western blotting testified that the purified recombinant protein could be specifically recognized by mouse serum immunized with T. gondii and mouse anti-recombinant protein serum.
  
  
  CONCLUSIONS
  The NTPase-II gene has been cloned and expressed in E.coli BL21 (DE3), and the purified protein of NTPase-II gene displays a specific antigenicity.
authors.affiliation: Wenzhou Medical College, Wenzhou 325035, China.
authors.forename: Dan
authors.initials: D
authors.lastname: Sha
authors.forename: Feng
authors.initials: F
authors.lastname: Tan
authors.forename: Chang-Wang
authors.initials: CW
authors.lastname: Pan
authors.forename: Shao-Hui
authors.initials: SH
authors.lastname: Liang
mesh_terms: D000818:Animals; D015153:Blotting, Western; D003001:Cloning, Molecular; D004591:Electrophoresis, Polyacrylamide Gel; D015870:Gene Expression; D007106:Immune Sera / Q000276:immunology; D007114:Immunization; D051379:Mice; D008813:Mice, Inbred ICR; D043583:Nucleoside-Triphosphatase / Q000235:genetics / Q000276:immunology / Q000378:metabolism*; D015800:Protozoan Proteins / Q000235:genetics / Q000276:immunology / Q000378:metabolism*; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000276:immunology / Q000378:metabolism*; D014122:Toxoplasma / Q000201:enzymology* / Q000235:genetics / Q000276:immunology
chemical_list: D007106:Immune Sera; D015800:Protozoan Proteins; D011993:Recombinant Fusion Proteins; D043583:Nucleoside-Triphosphatase