title: Development of the diagnostic immunoassay to detect anti-PreS1(21-47aa) antibody--a marker suggesting the health improvement of hepatitis B patients.
abstract: BACKGROUND
  A new immunoassay has been developed for the detection of the anti-PreS1(21-47aa) antibody in sera of hepatitis B virus (HBV)-infected patients. Anti-PreS1(21-47aa) antibody involves virus neutralization and is a new marker for diagnosing acute and chronic B hepatitis.
  
  
  METHODS
  The expression plasmids pGEXS I and pGEXS II, which expressed glutathione S-transferase (GST) fusion proteins containing a copy of PreS1(21-47aa) peptide and two orderly joined copies of PreS1(21-47aa) peptide, were constructed. The soluble expression products were purified by affinity chromatography.
  
  
  RESULTS
  The two PreS1(21-47aa) fusion proteins were both successfully applied in the immunoassay based on biotin-protein A and streptavidin-HRP, and could detect the anti-PreS1(21-47aa) antibody with high sensitivity in sera from hepatitis B patients. The anti-PreS1(21-27aa) antibody was detected during the recovery phase of acute hepatitis B patients, but it was found only in few of the chronic carriers by the established conventional system.
  
  
  CONCLUSIONS
  The follow-up study suggested that the presence of the anti-PreS1(21-27aa) antibody correlated well with the recovery of patients from hepatitis and the improvement in health.
authors.affiliation: Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, 200031, Shanghai, PR China.
authors.forename: Jun
authors.initials: J
authors.lastname: Wei
authors.forename: Xiao-jin
authors.initials: XJ
authors.lastname: Liu
authors.forename: Yu-qin
authors.initials: YQ
authors.lastname: Wang
authors.forename: Zhi-meng
authors.initials: ZM
authors.lastname: Lu
authors.forename: Guang-di
authors.initials: GD
authors.lastname: Li
authors.forename: Yuan
authors.initials: Y
authors.lastname: Wang
authors.forename: Zu-chuan
authors.initials: ZC
authors.lastname: Zhang
mesh_terms: D000595:Amino Acid Sequence; D000906:Antibodies / Q000097:blood*; D001483:Base Sequence; D004797:Enzyme-Linked Immunosorbent Assay / Q000379:methods*; D000939:Epitopes; D004926:Escherichia coli / Q000235:genetics; D005500:Follow-Up Studies; D006509:Hepatitis B / Q000188:drug therapy / Q000276:immunology*; D006514:Hepatitis B Surface Antigens / Q000235:genetics / Q000276:immunology*; D006801:Humans; D008969:Molecular Sequence Data; D010957:Plasmids; D011498:Protein Precursors / Q000235:genetics / Q000276:immunology*; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000276:immunology / Q000302:isolation & purification; D015203:Reproducibility of Results
chemical_list: D000906:Antibodies; D000939:Epitopes; D006514:Hepatitis B Surface Antigens; D011498:Protein Precursors; D011993:Recombinant Fusion Proteins; C050806:presurface protein 1, hepatitis B surface antigen