Difference between revisions of "Part:BBa K1497007"

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<b>Naringenin</b> is the main flavone from grapefruits. In plants, it is synthesized from tyrosine and is one of the central metabolites in the flavone biosynthesis. It is able to reduce the oxidative stress and inhibit some P450 enzymes. One of these cytochrome P450 enzymes are involved in the degradation of caffeine and increase the effect of caffeine after the inhibition with naringenin. The biosynthesis of naringenin is encoded by four genes and these proteins convert L-tyrosine to the bioactive enantiomer S-naringenin.       
 
<b>Naringenin</b> is the main flavone from grapefruits. In plants, it is synthesized from tyrosine and is one of the central metabolites in the flavone biosynthesis. It is able to reduce the oxidative stress and inhibit some P450 enzymes. One of these cytochrome P450 enzymes are involved in the degradation of caffeine and increase the effect of caffeine after the inhibition with naringenin. The biosynthesis of naringenin is encoded by four genes and these proteins convert L-tyrosine to the bioactive enantiomer S-naringenin.       
  
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<br><b>Figure 1</b> Reaction Scheme of the naringenin producing operon. The substrate for the reaction is L-tyrosine. The substrate is metabolized to S-naringenin in serval steps.</p>
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===Usage and Biology===
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Reaction Scheme of the naringenin producing operon. The substrate for the reaction is L-tyrosine. The substrate is metabolized to S-naringenin in serval steps.  <br></span></p>
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<td style="padding: 0cm 5.4pt; width: 336.7pt; height: 214.9pt;"> This part is a composite of four genes each with the strong RBS (<a href="/Part:BBa_B0034">BBa_B0034</a>).
 
<td style="padding: 0cm 5.4pt; width: 336.7pt; height: 214.9pt;"> This part is a composite of four genes each with the strong RBS (<a href="/Part:BBa_B0034">BBa_B0034</a>).
 
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   <li>4-coumaryl ligase - 4-CL         <a href="/Part:BBa_K1033001">BBa_K1033001</a></li>
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   <li>Tyrosine ammonia lyase - TAL  <a href="/Part:BBa_K1033000">BBa_K1033000</a></li>
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   <li class="block-10vi">4-coumaryl ligase - 4-CL         <a href="/Part:BBa_K1033001">BBa_K1033001</a></li>
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   <li>Chalchone isomerase - CHI            <a href="/Part:BBa_K1497100">BBa_K1497100</a></li>  
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   <li class="block-10vi">Chalchone isomerase - CHI            <a href="/Part:BBa_K1497100">BBa_K1497100</a></li>  
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Together, these genes build the naringenin biosynthesis operon without a promotor.  In addition of a promotor part the device is able to build S-naringenin. These device is working in <i>E. coli</i> K and B strains.<br><br>
 
Together, these genes build the naringenin biosynthesis operon without a promotor.  In addition of a promotor part the device is able to build S-naringenin. These device is working in <i>E. coli</i> K and B strains.<br><br>
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===Functional Parameters===
 
===Functional Parameters===

Revision as of 21:59, 14 October 2014

Naringenin producing operon

Naringenin is the main flavone from grapefruits. In plants, it is synthesized from tyrosine and is one of the central metabolites in the flavone biosynthesis. It is able to reduce the oxidative stress and inhibit some P450 enzymes. One of these cytochrome P450 enzymes are involved in the degradation of caffeine and increase the effect of caffeine after the inhibition with naringenin. The biosynthesis of naringenin is encoded by four genes and these proteins convert L-tyrosine to the bioactive enantiomer S-naringenin.


Figure 1 Reaction Scheme of the naringenin producing operon. The substrate for the reaction is L-tyrosine. The substrate is metabolized to S-naringenin in serval steps.



Usage and Biology

This part is a composite of four genes each with the strong RBS (BBa_B0034).


Together, these genes build the naringenin biosynthesis operon without a promotor. In addition of a promotor part the device is able to build S-naringenin. These device is working in E. coli K and B strains.

 iGEM TU Darmstadt 2014 :)

Figure 2 Genetic map of the naringenin operon with T7 promoter (BBa_K1497017). This device build naringenin in E. coli BL21(DE3) in present of the inductor IPTG .


Functional Parameters


The iGEM Team TU Darmstadt 2014 created the naringenin biosynthesis operons under the control of the T7 promoter BBa_I712074 and the strong constitutive promoter BBa_J23100, respectively . They measured the naringenin production after a 16 h incubation time with the naringenin biosensor BBa_K1497020.

The cell pellets from E. coli BL21(DE3) – pSB1C3-fdeR-gfp with and without T7-naringenin operon (BBa_K1497017) are shown in figure 3. Only in the cell pellet with BBa_K1497017 exhibited GFP fluorescence.

The Darmstadt team was also able to measure the GFP fluorescence quantitatively and to calculate with the help of a calibration curve for the naringenin sensor the production yield of both operons (Figure 4). For BBa_K1497017 was 3 µM naringenin calculated and for the operon with the constitutive promoter BBa_J23100 (BBa_K1497016) was 1.9 µM naringenin calculated.		 iGEM TU Darmstadt 2014 :)

Figure 2 Cell pellets with and without T7-Naringenin operon from E. coli BL21(DE3)-pSB1C3-fdeR-gfp. By using ultraviolet light the pellet containing the naringenin operon shows a GFP fluorescence.

Figure 1 Fluorescence of cells with and without the T7-naringenin operon BBa_K1497017 from E. coli BL21(DE3)-pSB1C3-fdeR-gfp and J23100-naringenin operon (BBa_K1497016) from E. coli Top10-pSB1C3-fdeR-gfp, respectively. E. coli BL21(DE3)-pSB1C3-fdeR-gfp without T7-naringenin operon showed no detectable fluorescence. Only in the cells with the functional operon is the GFP fluorescence measurable. The estimated yields are 3 µM for BBa_K1497017 and 1,9 µM for BBa_K1497016.

Sequence and Features


Assembly Compatibility:
  • 10
    COMPATIBLE WITH RFC[10]
  • 12
    INCOMPATIBLE WITH RFC[12]
    Illegal NheI site found at 1104
    Illegal NheI site found at 4631
  • 21
    INCOMPATIBLE WITH RFC[21]
    Illegal BglII site found at 1671
    Illegal BglII site found at 4640
    Illegal XhoI site found at 3638
  • 23
    COMPATIBLE WITH RFC[23]
  • 25
    INCOMPATIBLE WITH RFC[25]
    Illegal NgoMIV site found at 1777
    Illegal NgoMIV site found at 2609
    Illegal NgoMIV site found at 4611
    Illegal NgoMIV site found at 5187
    Illegal AgeI site found at 1872
    Illegal AgeI site found at 2038
  • 1000
    INCOMPATIBLE WITH RFC[1000]
    Illegal BsaI site found at 3067
    Illegal BsaI site found at 4560
    Illegal BsaI.rc site found at 1303
    Illegal BsaI.rc site found at 4042