title: Expression of HBsAg and preS2-S protein in different yeast based system: a comparative analysis.
abstract: We have expressed both S and preS2-S genes coding for the hepatitis B small (S) and medium (M) proteins, respectively, in different yeast based expression systems and compared the production level of the recombinant proteins. In Saccharomyces cerevisiae, viral genes were expressed under the inducible Gal10/cyc1 and the constitutive PGK promoters using 2mu replicating vectors. We showed that the yield of S protein was higher than M protein under both inducible (14.27 vs 10.9 mg/l) and constitutive (9.18 vs 6.39 mg/l) conditions, respectively. In the methylotrophic yeast Pichia pastoris, the viral genes were expressed in GS115 (Mut(+): Methanol Utilizing) and KM71 (Mut(S): Methanol Utilizing Slow) under the control of the alcohol oxidase promoter (AOX1). In Mut(S) background, both S and preS2-S genes were expressed at higher levels than in Mut(+). In attempt to increase the yield of recombinant viral proteins in S. cerevisiae, we have co-expressed both inducible and constitutive vectors harboring the S or preS2-S genes leading to recombinant strains called UTS (containing pDP/S+pYePIT/S) and UTP (containing pDP/preS2-S+pYePIT/preS2-S). We showed that the recombinant S and preS2-S proteins were successfully detected and the production level reached 18.31 mg/l for the S and 13.22 mg/l for the M proteins. Our comparative study provides evidence that in small scale, S. cerevisiae is more suitable for HBsAg and preS2-S proteins production than P. pastoris under inducible rather than constitutive condition.
authors.affiliation: Unité de Génétique du Cancer et Production de Protéines Thérapeutiques, Centre de Biotechnologie de Sfax, Route Sidi Mansour, B.P. 1177 Sfax, Tunisia.
authors.forename: Nadia
authors.initials: N
authors.lastname: Hadiji-Abbes
authors.forename: Istabrak
authors.initials: I
authors.lastname: Borchani-Chabchoub
authors.forename: Henda
authors.initials: H
authors.lastname: Triki
authors.forename: Radhouane
authors.initials: R
authors.lastname: Ellouz
authors.forename: Ali
authors.initials: A
authors.lastname: Gargouri
authors.forename: Raja
authors.initials: R
authors.lastname: Mokdad-Gargouri
mesh_terms: D001709:Biotechnology / Q000379:methods; D003001:Cloning, Molecular / Q000379:methods; D003470:Culture Media; D004797:Enzyme-Linked Immunosorbent Assay; D018628:Gene Dosage; D006514:Hepatitis B Surface Antigens / Q000096:biosynthesis* / Q000235:genetics; D007700:Kinetics; D010843:Pichia / Q000235:genetics*; D016133:Polymerase Chain Reaction; D011498:Protein Precursors / Q000096:biosynthesis* / Q000235:genetics; D011994:Recombinant Proteins / Q000096:biosynthesis / Q000235:genetics; D012441:Saccharomyces cerevisiae / Q000235:genetics*
chemical_list: D003470:Culture Media; D006514:Hepatitis B Surface Antigens; D011498:Protein Precursors; D011994:Recombinant Proteins; C050807:presurface protein 2, hepatitis B surface antigen