A method which uses high-level expression vector PBS (tae promoter) to express the HBV core antigen gone has been reported. Under the induction of iso-propylthio-β-D-galactosidc(IPTG)
the expression level of rccombinant plasmid h-as been increased 1000 times. After treatment with lysozyme-SDS-DNase system
the supernatant of crude bacterial lysale includes a large a mount of HBcAg.Through the studies of I1PTG induction concentration
IPTG induction time and the bacterial stale of initial induction
we have found a series of conditions to express the HBcAg gene efficiently. The highest liter of HBcAg is 1:25600