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[Construction of a temperature inducible shuttle expression vector and its application in Streptomyces]
Mei-Feng Tao1, Xiu-Fen Zhou, Tobias Kieser
1Key Laboratory of Agricultural Microbiology, Ministry of Agriculture, Huazhong Agricultural University, Wuhan 430070, China.
Sheng Wu Gong Cheng Xue Bao = Chinese Journal of Biotechnology
|October 19, 2002
Summary
A novel shuttle expression vector, pHZ1080, enables heat-induced expression of polyketide synthase (PKS) genes in both E. coli and Streptomyces. This vector facilitates heterologous gene expression in diverse microbial hosts.
Area of Science:
- Molecular Biology
- Microbial Genetics
Context:
- Developing versatile expression systems for genetic engineering is crucial.
- Shuttle vectors allow gene expression in multiple host organisms.
- Lambda phage regulatory elements offer inducible control over gene expression.
Purpose:
- To construct and characterize the pHZ1080 E. coli-Streptomyces shuttle expression vector.
- To investigate the heat-inducible expression of a polyketide synthase (PKS) gene using lambda phage promoter (PR).
- To demonstrate the efficacy of pHZ1080 for heterologous gene expression in both E. coli and Streptomyces.
Summary:
- The pHZ1080 shuttle vector was engineered by inserting a 2.7 kb PKS gene from Streptomyces sp. FR-008 downstream of the lambda phage PR promoter, creating pHZ1067.
- Polyketide synthase (PKS) protein expression was confirmed in Streptomyces lividans and E. coli using SDS-PAGE and Western blot, showing heat-dependent induction and identical molecular weights.
- Successful, heat-induced expression of PKS in both microbial hosts validates pHZ1080 as a functional tool for heterologous gene expression.
Impact:
- pHZ1080 provides a convenient and effective system for inducible gene expression in both Gram-negative (E. coli) and Gram-positive (Streptomyces) bacteria.
- This vector facilitates the study and manipulation of heterologous genes, particularly those requiring controlled expression.
- The findings support the broader application of lambda phage regulatory elements in diverse bacterial systems for biotechnology and synthetic biology.