title: [Expression of HBV S and preS1 fusion gene in Pichia pastoris expression system].
abstract: BACKGROUND
  To clone and express the ss1 recombinant gene containing S gene and preS1 (10-50 AA) gene in P. pastoris expression system.
  
  
  METHODS
  The fusion gene ss1 containing the S (1-222 AA) gene and preS1 (10-50 AA) gene was constructed with PCR method. The fusion ss1 gene was cloned into the expression vector of pPIC3.5k. The linear vector DNA was transformed into the host cell of GS115 with electroporation method. After screening with G418, the product was induced to express with methanol and its antigenicity was analyzed.
  
  
  RESULTS
  The molecular weight of expressed ss1 protein was about 30,000 dalton. The product was reactive to anti-HBs and anti-preS1 mAb.
  
  
  CONCLUSIONS
  The fusion gene was efficiently expressed in P. pastoris expression system.The expressed products have the antigenicity of both S and preS1 protein.
authors.affiliation: National Institute for the Control of Pharmaceutical and Biological Products, Beijing 100050, China.
authors.forename: Wei-jin
authors.initials: WJ
authors.lastname: Huang
authors.forename: You-chun
authors.initials: YC
authors.lastname: Wang
authors.forename: Hua-yuan
authors.initials: HY
authors.lastname: Zhang
mesh_terms: D015153:Blotting, Western; D004797:Enzyme-Linked Immunosorbent Assay; D015870:Gene Expression; D006514:Hepatitis B Surface Antigens / Q000235:genetics / Q000378:metabolism*; D010843:Pichia / Q000235:genetics*; D010957:Plasmids / Q000235:genetics; D011498:Protein Precursors / Q000235:genetics / Q000378:metabolism*; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism*; D014170:Transformation, Genetic
chemical_list: D006514:Hepatitis B Surface Antigens; D011498:Protein Precursors; D011993:Recombinant Fusion Proteins; C050806:presurface protein 1, hepatitis B surface antigen