Optimization of staphylokinase production inBacillus subtilis using inducible and constitutive promoters

  • June-Hyung Kim
  • Sui-Lam Wong
  • Byung-Gee Kim


Staphylokinase (SAK) was produced inB. subtillis using two different promoter systems,i.e. the P43 andsacB promoters. To maximize SAK expression inB. subtilis, fermentation control strategies for each promoter were examined. SAK, under P43, a vegetative promoter transcribed mainly by σB containing RNA polymerase, was overexpressed at low dissolved oxygen (D.O.) levels, suggesting that thesigB operon is somewhat affected by the energy charge of the cells. The expression of SAK at the 10% D.O. level was three times higher than that at the 50% D.O. level. In the case ofsacB, a sucrose-inducible promoter, sucrose feeding was used to control the induction period and induction strength. Since sucrose is hydrolyzed by two sucrose hydrolyzing enzymes in the cell and culture broth, the control strategy was based on replenishing the loss of sucrose in the culture. With continuous feeding of sucrose, WB700 (pSAKBQ), which contains the SAK gene undersacB promoter, yieldedca. 35% more SAK than the batch culture. These results present efficient promoter-dependent control strategies inB. subtilis host system for foreign protein expression.


staphylokinase B. subtilis P43 promoter sacB promoter 


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Copyright information

© The Korean Society for Biotechnology and Bioengineering 2001

Authors and Affiliations

  1. 1.School of Chemical Engineering and The Institute of Molecular Biology and GeneticsSeoul National UniversitySeoulKorea
  2. 2.Department of Biological Sciences, Division of Cellular and Microbial biologyUniversity of CalgaryCanada

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