Difference between revisions of "Part:BBa K3832000"

 
Line 10: Line 10:
 
Derived from E.coli DH5alpha strain.
 
Derived from E.coli DH5alpha strain.
  
−
<!-- Add more about the biology of this part here
+
<!-- Add more about the biology of this part here-->
−
===Usage and Biology===
+
−
 
+
 
<!-- -->
 
<!-- -->
 
<span class='h3bb'>Sequence and Features</span>
 
<span class='h3bb'>Sequence and Features</span>
Line 22: Line 20:
 
<partinfo>BBa_K3832000 parameters</partinfo>
 
<partinfo>BBa_K3832000 parameters</partinfo>
 
<!-- -->
 
<!-- -->
 +
 +
 +
===1.Useage & Biology===
 +
This part encodes a mutant of aroG(as the improvement of part BBa_K1060000). It can be expressed in Prokaryote cells, and functionally verified in E.coli DH5alpha strain.
 +
 +
Under physiological conditions, aroG catalyze the reaction phosphoenolpyruvate + D-erythrose 4-phosphate + H2O = 3-deoxy-D-arabino-hept-2-ulosonate 7-phosphate  + phosphate. This reaction is a key branching point of the glycolysis and shikimate pathways. Expression of aroG can lead to more substrate into the shikimate pathway, which can improve the yield of downstream products as tryptophan, phenylalanine, tyrosine and benzazole.
 +
 +
In our project, aroG-s211f is used to improve the production of tryptophan. Considering the over-expression of aroG-s211f could significantly reduce the amount of substrate (glucose) entering the glycolysis reaction, in turn affects the normal process of cell proliferation, the expression of aroG is designed under strict control by Toggle-switch circuit (View our design on Team:XJTU-China/Design - 2021.igem.org ).
 +
 +
===2.Structure===
 +
 +
 +
===3.Characterization & Measurement===
 +
We have constructed the inducible circuit BBa_K3832008 to characterize and measure the function of aroG-s211f, by detecting the yield of tryptophan. Besides, to verify the impact of aroG-s211f to the cell proliferation, we measured the growth curve of the wild-type E.coli and the engineered E.coli with aroG-s211f.
 +
 +
Fig. 3.1 shows the yield of tryptophan. The engineered E.coli with aroG-s211f induced by 1mM IPTG resents a increased production of tryptophan, comparing in absent of IPTG or aroG-s211f (wild-type E.coli).
 +
<!--Figure 3.1-->
 +
As is showed in Fig. 3.2, by using the Logistic equation to fit the growth curve, the inhibitory effect of aroG expression on cell proliferation was verified (as the parameter r decreased in E.coli with aroG-s211f and induced by IPTG, which represents the reciprocal of the time it takes for the population to double).
 +
<!--Figure 3.2-->
 +
 +
===4.Modeling===

Revision as of 03:13, 27 September 2021


aroG (Mutant S211F)

This part encodes a mutant of AroG (3-deoxy-7-phosphoheptulonate synthase, EC 2.5.1.54 ), in which serine at 211 was replaced by phenylalanine. The mutant can relieve the allosteric inhibition of phenylalanine, thus increasing the catalytic rate and downstream product yield.

The enzyme that encoded by the sequence catalyze the following reactions: phosphoenolpyruvate+D-erythrose 4-phosphate+H2O =3-deoxy-D-arabino-hept-2-ulosonate 7-phosphate +phosphate

Derived from E.coli DH5alpha strain.

Sequence and Features


Assembly Compatibility:
  • 10
    COMPATIBLE WITH RFC[10]
  • 12
    COMPATIBLE WITH RFC[12]
  • 21
    INCOMPATIBLE WITH RFC[21]
    Illegal XhoI site found at 934
  • 23
    COMPATIBLE WITH RFC[23]
  • 25
    COMPATIBLE WITH RFC[25]
  • 1000
    COMPATIBLE WITH RFC[1000]



1.Useage & Biology

This part encodes a mutant of aroG(as the improvement of part BBa_K1060000). It can be expressed in Prokaryote cells, and functionally verified in E.coli DH5alpha strain.

Under physiological conditions, aroG catalyze the reaction phosphoenolpyruvate + D-erythrose 4-phosphate + H2O = 3-deoxy-D-arabino-hept-2-ulosonate 7-phosphate + phosphate. This reaction is a key branching point of the glycolysis and shikimate pathways. Expression of aroG can lead to more substrate into the shikimate pathway, which can improve the yield of downstream products as tryptophan, phenylalanine, tyrosine and benzazole.

In our project, aroG-s211f is used to improve the production of tryptophan. Considering the over-expression of aroG-s211f could significantly reduce the amount of substrate (glucose) entering the glycolysis reaction, in turn affects the normal process of cell proliferation, the expression of aroG is designed under strict control by Toggle-switch circuit (View our design on Team:XJTU-China/Design - 2021.igem.org ).

2.Structure

3.Characterization & Measurement

We have constructed the inducible circuit BBa_K3832008 to characterize and measure the function of aroG-s211f, by detecting the yield of tryptophan. Besides, to verify the impact of aroG-s211f to the cell proliferation, we measured the growth curve of the wild-type E.coli and the engineered E.coli with aroG-s211f.

Fig. 3.1 shows the yield of tryptophan. The engineered E.coli with aroG-s211f induced by 1mM IPTG resents a increased production of tryptophan, comparing in absent of IPTG or aroG-s211f (wild-type E.coli). As is showed in Fig. 3.2, by using the Logistic equation to fit the growth curve, the inhibitory effect of aroG expression on cell proliferation was verified (as the parameter r decreased in E.coli with aroG-s211f and induced by IPTG, which represents the reciprocal of the time it takes for the population to double).

4.Modeling