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Published on: February 22, 2016
ReToAd: simple method for the rapid replacement of promoters to improve protein production
Feng Cheng1, Chao Xiang1, Xiao-Jian Zhang1
1Key Laboratory of Bioorganic Synthesis of Zhejiang Province, College of Biotechnology and Bioengineering, Zhejiang University of Technology, 18 Chaowang Road, Hangzhou, 310014, People's Republic of China.
Objective:
To develop a method for fast replacement of promoters to improve protein production.
Results:
A method (entitled retreat to advance or "ReToAd"), which includes a deleting PCR and a touchdown PCR, was validated by replacing seven IPTG-inducible promoters with enhanced green fluorescent protein (eGFP). The seven promoters were fully recovered by sequencing only 30 clones. The activity of E. coli harboring ω-transaminase (ω-TA) was increased from 112 U/mg cells (T7 promoter) to 147 U/mg cells (Trc promoter) by combining ReToAd and screening experiments. After screening a library comprising glutamate dehydrogenase (GDH) expressed by different promoters, the activity of E. coli cell harboring Trc-promoter-expressed GDH was ~31-fold higher than that of T7-promoter-expressed GDH.
Conclusions:
The "ReToAd" for in situ rapid replacement of promoters was developed and optimized, and one round of "ReToAd" can be completed within 3 days.
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