Difference between revisions of "Part:BBa K3147006"

 
(→‎I. Part BBa_K3147006 function)
 
(12 intermediate revisions by 3 users not shown)
Line 1: Line 1:
  
 
__NOTOC__
 
__NOTOC__
−
<partinfo>BBa_K3147006 short</partinfo>
+
<div align="center"><partinfo>BBa_K3147006 short</partinfo></div>
 +
 
 +
 
 +
 
 +
===I. Part BBa_K3147006 function===
 +
 
 +
The 2019 Montpellier iGEM team made this construction in order to be able to compare the basal activity of the TEV protease [[Part:BBa_ K1319004]] with the mutant TEV protease TEVPE10 [3]. A modified TEV cut-off site was added between the MBP and the protease. MBP increases the solubility of the fusion protein [1], preventing the aggregation of the protein of interest. This stabilizes the expression and the sequence of the produced MBP does not have a signal peptide, which allows the protein to remain in the cytosol. The TEV cutting site allows self-cleavage of MBP from TEV once the protein is produced [2].
 +
 
 +
<div align="center">[[File:designK3147006.png|650px]]</div>
 +
 
 +
<div align="center"><b>Figure 1</b>: Construct Design: MBP-TEVcs-TEVPE10 with modified TEV cutting site.</div>
 +
 
 +
===II. Proof of function===
 +
 
 +
The construction was cloned by Gibson Assembly in a pOUT18 backbone under the control of a Tet-on promoter in order to control its expression. The TEV cutting site used is the mutated site: ENLYFE/G this mutation allows theoretically the mutant TEV to better cleave this sequence according to this source [3].
 +
 
 +
<div align="center">[[File:plasmideK3147006.png|450px]]</div>
 +
 
 +
<div align="center"><b>Figure 2</b> : MBP-TEVPE10 reporter gene in its backbone pOUT18.</div>
 +
 
 +
The experimental approach that has been used to test the protease activity is to compare the fluorescence restoration rate of sfGFP compared to MBP-TEV and MBP-TEVPE10. In this experiment, basal controls of maximum and minimum fluorescence of the reporter genes were used. Fluorescence data are obtained from plate reader at 37°C with <i>E.coli</i> NEB10B.  The protease is expressed by inducing the Tet promoter with 50 ng/mL of aTc (anhydrotetracycline).
 +
 
 +
<div align="center">[[File:resultK3147006.png|500px]]</div>
 +
 
 +
<div align="center"><b>Figure 2</b>: Comparison of the activity of TEVPE10 to the wild-type TEV by measuring the fluorescence of a reporter fused to a cleavable proteolysis tag</div>
 +
 
 +
We can see that the TEVPE10 is more efficient than the wild-type TEV. We believe this is because our wild-type TEV is not the same one in the article where we found this mutant.
 +
 
 +
==Reference==
 +
 
 +
[1]Raran-Kurussi, Sreejith, et David S. Waugh. 2012. « The Ability to Enhance the Solubility of Its Fusion Partners Is an Intrinsic Property of Maltose-Binding Protein but Their Folding Is Either Spontaneous or Chaperone-Mediated » éd. Bostjan Kobe. PLoS ONE 7(11): e49589.
 +
 
 +
[2]Shih, Y.-P. 2005. « Self-Cleavage of Fusion Protein in Vivo Using TEV Protease to Yield Native Protein ». Protein Science 14(4): 936‑41.
 +
 
 +
[3] Yi, L. et al. 2013. « Engineering of TEV Protease Variants by Yeast ER Sequestration Screening (YESS) of Combinatorial Libraries ». Proceedings of the National Academy of Sciences 110(18): 7229‑34.
 +
 
  
−
The Montpellier 2019 team made this construction in order to be able to compare the basal activity of the TEV protease (BBa_ K1319004) with the mutant TEV protease called TEVPE10, we were able to find the mutant TEV sequences in this article [3].
 
−
This construction was used as a control within the Karma project presented by the iGEM Montpellier 2019 team. It produces a mutant TEV fused to an MBP with, in between a modified TEV cutting site to increase the mutant's activity. MBP increases the solubility of the fusion protein [1] preventing the aggregation of the protein of interest ; the sequence of the produced MBP does not have a signal peptide which keeps the protein in the cytosol. The TEV cutting site allows to separate MBP from TEV once the protein is produced, indeed the TEV protease is capable of self-cleavage [2] to remove MBP.
 
  
 
<!-- Add more about the biology of this part here
 
<!-- Add more about the biology of this part here

Latest revision as of 16:33, 20 October 2019


mutant TEV (PE10) protease with TEV-cleavable maltose binding protein


I. Part BBa_K3147006 function

The 2019 Montpellier iGEM team made this construction in order to be able to compare the basal activity of the TEV protease Part:BBa_ K1319004 with the mutant TEV protease TEVPE10 [3]. A modified TEV cut-off site was added between the MBP and the protease. MBP increases the solubility of the fusion protein [1], preventing the aggregation of the protein of interest. This stabilizes the expression and the sequence of the produced MBP does not have a signal peptide, which allows the protein to remain in the cytosol. The TEV cutting site allows self-cleavage of MBP from TEV once the protein is produced [2].

DesignK3147006.png
Figure 1: Construct Design: MBP-TEVcs-TEVPE10 with modified TEV cutting site.

II. Proof of function

The construction was cloned by Gibson Assembly in a pOUT18 backbone under the control of a Tet-on promoter in order to control its expression. The TEV cutting site used is the mutated site: ENLYFE/G this mutation allows theoretically the mutant TEV to better cleave this sequence according to this source [3].

PlasmideK3147006.png
Figure 2 : MBP-TEVPE10 reporter gene in its backbone pOUT18.

The experimental approach that has been used to test the protease activity is to compare the fluorescence restoration rate of sfGFP compared to MBP-TEV and MBP-TEVPE10. In this experiment, basal controls of maximum and minimum fluorescence of the reporter genes were used. Fluorescence data are obtained from plate reader at 37°C with E.coli NEB10B. The protease is expressed by inducing the Tet promoter with 50 ng/mL of aTc (anhydrotetracycline).

ResultK3147006.png
Figure 2: Comparison of the activity of TEVPE10 to the wild-type TEV by measuring the fluorescence of a reporter fused to a cleavable proteolysis tag

We can see that the TEVPE10 is more efficient than the wild-type TEV. We believe this is because our wild-type TEV is not the same one in the article where we found this mutant.

Reference

[1]Raran-Kurussi, Sreejith, et David S. Waugh. 2012. « The Ability to Enhance the Solubility of Its Fusion Partners Is an Intrinsic Property of Maltose-Binding Protein but Their Folding Is Either Spontaneous or Chaperone-Mediated » éd. Bostjan Kobe. PLoS ONE 7(11): e49589.

[2]Shih, Y.-P. 2005. « Self-Cleavage of Fusion Protein in Vivo Using TEV Protease to Yield Native Protein ». Protein Science 14(4): 936‑41.

[3] Yi, L. et al. 2013. « Engineering of TEV Protease Variants by Yeast ER Sequestration Screening (YESS) of Combinatorial Libraries ». Proceedings of the National Academy of Sciences 110(18): 7229‑34.


Sequence and Features


Assembly Compatibility:
  • 10
    COMPATIBLE WITH RFC[10]
  • 12
    COMPATIBLE WITH RFC[12]
  • 21
    COMPATIBLE WITH RFC[21]
  • 23
    COMPATIBLE WITH RFC[23]
  • 25
    COMPATIBLE WITH RFC[25]
  • 1000
    INCOMPATIBLE WITH RFC[1000]
    Illegal BsaI site found at 77
    Illegal SapI.rc site found at 1868