title: High-level expression of a 56-kilodalton protein gene (bor56) of Rickettsia tsutsugamushi Boryong and its application to enzyme-linked immunosorbent assays.
abstract: The 56-kDa protein of Rickettsia tsutsugamushi, which is located on the rickettsial surface, has been shown to be an immunodominant antigen. The gene that encodes the 56-kDa protein of R. tsutsugamushi Boryong (bor56) was cloned. Sequencing revealed an open reading frame of 1,602 bp encoding 534 amino acids with a molecular weight of 56,803. The 56-kDa protein of R. tsutsugamushi Boryong (Bor56) was expressed as a fusion protein with the maltose-binding protein of Escherichia coli by deleting 252 bp from the 5' end of the open reading frame and subcloning it into the StuI site of pIH821. The recombinant fusion protein was purified by amylose column chromatography for application in an enzyme-linked immunosorbent assay to evaluate the ability of the method to detect the antibody to R. tsutsugamushi in human patient sera. By using sera from 100 patients with scrub typhus and 70 patients with other febrile diseases, a high diagnostic sensitivity (95%) and a high diagnostic specificity (100%) were demonstrated, suggesting the suitability of the recombinant antigen for use as an immunodiagnostic tool.
authors.affiliation: Department of Microbiology, Seoul National University College of Medicine, Republic of Korea.
authors.forename: I S
authors.initials: IS
authors.lastname: Kim
authors.forename: S Y
authors.initials: SY
authors.lastname: Seong
authors.forename: S G
authors.initials: SG
authors.lastname: Woo
authors.forename: M S
authors.initials: MS
authors.lastname: Choi
authors.forename: W H
authors.initials: WH
authors.lastname: Chang
mesh_terms: D018528:ATP-Binding Cassette Transporters; D000595:Amino Acid Sequence; D000907:Antibodies, Bacterial / Q000097:blood; D000942:Antigens, Bacterial / Q000276:immunology; D001426:Bacterial Proteins / Q000096:biosynthesis* / Q000235:genetics / Q000276:immunology / Q000302:isolation & purification; D001483:Base Sequence; D002352:Carrier Proteins / Q000096:biosynthesis / Q000235:genetics; D003001:Cloning, Molecular; D003429:Cross Reactions; D004797:Enzyme-Linked Immunosorbent Assay / Q000379:methods*; D004926:Escherichia coli / Q000235:genetics; D029968:Escherichia coli Proteins; D005455:Fluorescent Antibody Technique; D005798:Genes, Bacterial / Q000235:genetics*; D006801:Humans; D058619:Maltose-Binding Proteins; D008969:Molecular Sequence Data; D009004:Monosaccharide Transport Proteins; D012285:Orientia tsutsugamushi / Q000235:genetics*; D011993:Recombinant Fusion Proteins / Q000096:biosynthesis / Q000276:immunology; D012612:Scrub Typhus / Q000175:diagnosis* / Q000276:immunology; D012680:Sensitivity and Specificity
chemical_list: C080442:56 kDa antigen, Rickettsia; D018528:ATP-Binding Cassette Transporters; D000907:Antibodies, Bacterial; D000942:Antigens, Bacterial; D001426:Bacterial Proteins; D002352:Carrier Proteins; D029968:Escherichia coli Proteins; D058619:Maltose-Binding Proteins; D009004:Monosaccharide Transport Proteins; D011993:Recombinant Fusion Proteins; C461599:maltose transport system, E coli