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Part:BBa_K2333407
UNS J23100 sfGFP pdt A
This part is designed to facilitate easy measurement of the strength of protein degradation tag (pdt) A by measuring time to steady-state fluorescence values of sfGFP under the control of the strong constitutive promoter BBa_J23100. William and Mary iGEM 2017 used pdts as a method to control gene expression speed.This part was utilized to characterize the degradation properties of pdt A and confirm the fact that different pdts have different degradation strengths. See [http://2017.igem.org/Team:William_and_Mary/Results William and Mary's 2017 project] for more details. This part is one of a series of sfGFP reporter pdt parts. Series range is from BBa_K2333407 to BBa_K2333412.
Usage and Biology
Protein degradation tag A (BBa_K2333001) the strongest of the 6 protein degradation tags that William and Mary 2017 characterized, and is associated with the E. Coli orthogonal protease mf-Lon (BBa_K2333011). Therefore this part has the greatest degradation rate of the 6 protein degradation tags and it is the fastest to reach the steady-state fluorescence value. This part contains J23100 constitutive promoter, BBa_B0034 (RBS),pdt A, a double stop codon and BBa_B0015 (double terminator) in the William and Mary iGEM Universal Nucleotide Sequences (UNS) format. See Torella, et. al (2013). In order to demonstrate that protein degradation tags operated similarily regardless of the tagged protein, sfGFP reporters that were analogous to the mScarlet-I parts (BBa_K2333413 to BBa_K2333419) were built and characterized. This demonstrates that the protein degradation tags are modular and that they have differential strengths even when they are tagged on different proteins.
Characterization
W&M 2017 characterized this tagless construct along with IPTG-inducible mf-Lon protease as a control for their degradation rate and speed change effect measurements. The graphs below show this speed data along with the data from the other tags in this series (BBa_K2333427-BBa_K2333433).
Time course measurements were performed according to standard protocol, and sfGFP fluorescence was normalized to steady state based upon when fluorescence no longer increased. As the no-Lon condition had not reached steady state when time course was ended, it was normalized to the final collected data point, which is likely close to the true steady state.
Sequence and Features
- 10COMPATIBLE WITH RFC[10]
- 12INCOMPATIBLE WITH RFC[12]Illegal NheI site found at 47
Illegal NheI site found at 70 - 21COMPATIBLE WITH RFC[21]
- 23COMPATIBLE WITH RFC[23]
- 25COMPATIBLE WITH RFC[25]
- 1000INCOMPATIBLE WITH RFC[1000]Illegal SapI.rc site found at 106
References
[1] Torella JP, Boehm CR, Lienert F, Chen J-H, Way JC, Silver PA. Rapid construction of insulated genetic circuits via synthetic sequence-guided isothermal assembly. Nucleic Acids Research. 2013;42(1):681–689.
[2] Cameron DE, Collins JJ. Tunable protein degradation in bacteria. Nature Biotechnology. 2014;32(12):1276–1281.
[3] Lou, C., Stanton, B., Chen, Y.-J., Munsky, B., & Voigt, C. A. (2012). Ribozyme-based insulator parts buffer synthetic circuits from genetic context. Nature Biotechnology, 30(11), 1137–1142. http://doi.org/10.1038/nbt.2401
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