Difference between revisions of "Part:BBa K3278002"
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In this part, we use the modified tac promoter(abbreviated as mtac promoter) to substitute the lacIq promoter in front of YF1 and Fixk2, largely reducing the leakage while maintain reasonable expression under blue light.
 
In this part, we use the modified tac promoter(abbreviated as mtac promoter) to substitute the lacIq promoter in front of YF1 and Fixk2, largely reducing the leakage while maintain reasonable expression under blue light.
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pDawn with T7 promoter is abbreviated as <b>T7c</b> below. pDawn with tac promoter is abbreviated as <b>tac</b> below. pDawn with modified tac promoter is abbreviated as <b>mtac</b> below. pDawn with J23119 promoter is abbreviated as <b>119</b> below. pDawn with J23100 promoter is abbreviated as <b>100</b> below.
  
 
[[Image:tac_0h.png|400px|center|pDawn-tac-0 hour]]
 
[[Image:tac_0h.png|400px|center|pDawn-tac-0 hour]]

Revision as of 04:19, 20 October 2019


pDawn with modified tac promoter

pDawn is a blue light control system which can start the expression of target gene under the inducement of blue light. More information in BBa_K1075044 added by iGEM13_Bonn.

However, expression leakage and delay are the two main problems of pdawn system. Leakage refers to the expression of target protein without light. According to our measurement, samples strictly kept away from light still had significant expression of GFP after being cultured for one night. Therefore, we carefully studied the gene circuits of pdawn system [2] [3] and hypothesized that enhancing the strength of the promoter of YF1 may enhance the repression of protein expression in the dark, thus solving the leakage problem.

In this part, we use the modified tac promoter(abbreviated as mtac promoter) to substitute the lacIq promoter in front of YF1 and Fixk2, largely reducing the leakage while maintain reasonable expression under blue light.

pDawn with T7 promoter is abbreviated as T7c below. pDawn with tac promoter is abbreviated as tac below. pDawn with modified tac promoter is abbreviated as mtac below. pDawn with J23119 promoter is abbreviated as 119 below. pDawn with J23100 promoter is abbreviated as 100 below.

pDawn-tac-0 hour
Fig1. pDawn-tac-0 hour


pDawn-tac-6 hour
Fig2. pDawn-tac-6 hour


pDawn-tac-12 hour
Fig3. pDawn-tac-12 hour


Dark to light-12 hour
Fig4. Dark to light-12 hour


pDawn-tac-24 hour
Fig5. pDawn-tac-24 hour


Dark to light-24 hour
Fig6. Dark to light-24 hour


pDawn-tac-30 hour
Fig7. pDawn-tac-30 hour


Dark to light-30 hour
Fig8. Dark to light-30 hour


pDawn-tac-36 hour
Fig9. pDawn-tac-36 hour


Dark to light-36 hour
Fig10. Dark to light-36 hour


To see more changes on pDawn, go to the websites below.

pDawn-mEGFP: <a href="https://parts.igem.org/Part:BBa_K3278000"> BBa_3278000</a>

pDawn with T7 promoter: <a href="https://parts.igem.org/Part:BBa_K3278001"> BBa_3278001</a>

pDawn with mtac promoter: <a href="https://parts.igem.org/Part:BBa_K3278002"> BBa_3278002</a> (good)

pdawn with tac promoter: <a href="https://parts.igem.org/Part:BBa_K3278005"> BBa_3278005</a>

pDawn with YF2: <a href="https://parts.igem.org/Part:BBa_K3278006"> BBa_3278006</a> (good)

Sequence and Features


Assembly Compatibility:
  • 10
    COMPATIBLE WITH RFC[10]
  • 12
    COMPATIBLE WITH RFC[12]
  • 21
    INCOMPATIBLE WITH RFC[21]
    Illegal BglII site found at 2159
  • 23
    COMPATIBLE WITH RFC[23]
  • 25
    INCOMPATIBLE WITH RFC[25]
    Illegal NgoMIV site found at 46
    Illegal NgoMIV site found at 178
    Illegal NgoMIV site found at 272
    Illegal NgoMIV site found at 565
    Illegal NgoMIV site found at 1059
    Illegal NgoMIV site found at 1077
    Illegal NgoMIV site found at 1167
    Illegal AgeI site found at 397
    Illegal AgeI site found at 1525
  • 1000
    INCOMPATIBLE WITH RFC[1000]
    Illegal BsaI site found at 1620
    Illegal BsaI.rc site found at 508