title: Cloning and expression of a cDNA encoding epitopes shared by 15- and 60-kilodalton proteins of Cryptosporidium parvum sporozoites.
abstract: A cDNA (CP15/60) encoding epitopes of Cryptosporidium parvum 15- and 60-kDa sporozoite proteins was isolated and expressed in Escherichia coli toward the goal of developing an immunogen for producing high-titer anticryptosporidial colostrum. Antisera prepared in rats to native C. parvum 15-kDa protein and used to identify the CP15/60 bacteriophage clone recognized both 15- and 60-kDa in vitro translation products derived from sporozoite RNA. Antisera specific for recombinant CP15/60 antigen recognized native 15- and 60-kDa C. parvum sporozoite proteins by immunoblotting and identified both surface and internal antigens on C. parvum sporozoites by immunofluorescence staining. Northern (RNA) and Southern blot hybridization experiments using sporozoite RNA and DNA indicated that CP15/60 DNA is transcribed as a single 1.4-kb RNA species from a single-copy gene. Recombinant CP15/60 antigen was recognized by hyperimmune colostrum from cows immunized with C. parvum oocyst-sporozoite protein and by convalescent-phase sera from C. parvum-infected calves.
authors.affiliation: Protozoan Diseases Laboratory, U.S. Department of Agriculture, Beltsville, Maryland 20705.
authors.forename: M C
authors.initials: MC
authors.lastname: Jenkins
authors.forename: R
authors.initials: R
authors.lastname: Fayer
authors.forename: M
authors.initials: M
authors.lastname: Tilley
authors.forename: S J
authors.initials: SJ
authors.lastname: Upton
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology; D001483:Base Sequence; D002417:Cattle; D003001:Cloning, Molecular; D016785:Cryptosporidium parvum / Q000235:genetics / Q000276:immunology*; D016054:DNA, Protozoan; D000939:Epitopes / Q000235:genetics*; D005455:Fluorescent Antibody Technique; D007106:Immune Sera / Q000276:immunology; D008969:Molecular Sequence Data; D009693:Nucleic Acid Hybridization; D015800:Protozoan Proteins / Q000235:genetics / Q000276:immunology* / Q000302:isolation & purification; D051381:Rats; D011994:Recombinant Proteins / Q000235:genetics / Q000276:immunology* / Q000302:isolation & purification
chemical_list: D000911:Antibodies, Monoclonal; D016054:DNA, Protozoan; D000939:Epitopes; D007106:Immune Sera; D015800:Protozoan Proteins; D011994:Recombinant Proteins