Part:BBa_K4698008
T7 RNA polymerase has a protein degradation tag attached to its C-terminus
T7 RNA polymerase has a protein degradation tag (degron) attached to its C-terminus, which allows rapid degradation of T7 RNA polymerase, so the T7 promoter cannot be transcribed. Its commonly used in Phage-assisted continuous (PACE).
Usage and Biology
While reviewing CRISPR-related materials, we discovered a particularly interesting evolutionary system- phage-assisted continuous evolution (PACE)[1,2], which can enable continuous directed evolution of gene-coding molecules that can be associated with protein production in E. coli. Then, we found a protein degradation tag-degron[3], that enables rapid hydrolysis of proteins with little functionality, which allows degron to be used in a number of protein co-expression screening systems.
We expressed T7 RNA polymerase (T7 RNAp) in fusion with degron (Fig. 1a), which showed that the T7 RNAp-degron fusion protein was barely able to initiate the transcription of the T7 promoter (Fig. 1b), further demonstrating that degron was able to degrade the T7 RNAp before it could perform its normal function.
Figure 1. a, Schematic representation of the T7 RNAp-degron fusion expression plasmid. b, For the T7 RNAp-degron fusion protein, the efficiency of the T7 promoter, Blank, LB medium. NT, E.coli without the GFP expression plasmid, n=3.
Refrence
1. Esvelt, K. M., Carlson, J. C. & Liu, D. R. A system for the continuous directed evolution of biomolecules. Nature 472, 499-503 (2011). 2. Miller, S. M., Wang, T. & Liu, D. R. Phage-assisted continuous and non-continuous evolution. Nature Protocols 15, 4101-4127 (2020). 3. Karzai, A. W., Roche, E. D. & Sauer, R. T. The SsrA-SmpB system for protein tagging, directed degradation and ribosome rescue. Nat Struct Biol 7, 449-455 (2000).Sequence and Features
- 10COMPATIBLE WITH RFC[10]
- 12COMPATIBLE WITH RFC[12]
- 21COMPATIBLE WITH RFC[21]
- 23COMPATIBLE WITH RFC[23]
- 25COMPATIBLE WITH RFC[25]
- 1000COMPATIBLE WITH RFC[1000]
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