Difference between revisions of "Part:BBa K3788003"

 
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<partinfo>BBa_K3788003 short</partinfo>
 
<partinfo>BBa_K3788003 short</partinfo>
  
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The Part BBa_K3788003 is a part composed with BBa_K3788002 (6his_P20) and BBa_K3788001 (Flag_cry11Aa). The chaperon P20 allow the well stability of Cry11Aa. Expressed in operon, it allow a better production of Cry11Aa. Both proteins are Bacillus thuringiensis proteins. P20 chaperon have a histidin tag in Nter, Cry11Aa toxin have a Flag tag in Nter to allow to purified proteins P20 and Cry11Aa; and allow the detection and specific identification by WesterBlot. The gene was optimised for E. coli K12.
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<p>The Part BBa_K3788003 is a part composed with BBa_K3788002 (6his_<i>p20</i>) and BBa_K3788001 (Flag_<i>cry11Aa</i>). Both proteins are <i>Bacillus thuringiensis</i> proteins. P20 chaperon have a histidin tag in Nter, Cry11Aa toxin have a Flag tag in Nter to allow to purified proteins P20 and Cry11Aa; and allow the detection and specific identification by WesterBlot. The gene was optimised for E. coli K12.</p>
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To allow the expression in operon, an RBS sequence is added before the ATG of Flag_cry11Aa gene sequence.
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<p>To allow the expression in operon, an RBS sequence is added before the ATG of Flag_cry11Aa gene sequence.</p>
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<p><u> Expected sizes </u>:</p>
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<table style="width:100%">
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  <tr>
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    <th></th>
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    <th>6His-P20</th>
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    <th>Flag-Cry11Aa</th>
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  </tr>
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  <tr>
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    <td>Lenght of DNA sequence </td>
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    <td>570 bp</td>
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    <td>1956 bp</td>
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    <td>Protein size </td>
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    <td>20 kDa</td>
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    <td>70 kDa</td>
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<u>Mode of action of Cry toxins:</u>
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<p>Cry toxins, in the form of a pro-toxin (inactive), will undergo proteolytic cleavage at their N-terminus end, allowing the unmasking of the zone of interaction with the receptor. Mature Cry toxins <b>recognize</b> glycoprotein-type receptors on the surface of midgut cells, more specifically the microvilli of the apical membranes. The II and III domains, forming 3 β-sheets, allow this interaction. Once recognized, domain I, forming 7 amphipathic α-helices, one of which is hydrophobic, is inserted into the membrane to allow the formation of the <b>pre-pore</b>. From this first step emerges the formation of <b>Cry toxins oligomers</b> and the formation of the pore. This allows <b>ion leakage and cell lysis</b>. Following this, an event cascades lead to sepsis resulting in the death of the insect </p>
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<p> Cry11Aa has a toxic action, specific to <i>A. aegypti</i> because its -8 loop, region -4 and domain II loop 3 recognize the mosquito midgut BBMV receptor. </p>
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<u>P20 chaperon and Cry11Aa toxin</u>
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<p> Was discovered in <i>B.thuringiensis</i>, a p20 gene in operon with <i>cry11Aa</i> and <i<cyt1Aa</i>. Thus, the P20 protein was shown to be necessary for the formation of inclusion bodies of Cry11Aa and Cyt1Aa. P20 would allow a greater production of these toxins and allow their stability (Cyt1Aa would be protected from the proteolytic action before its maturation). <b>The co-production of P20 and Cyt1Aa in <i>E.coli</i> would limit its toxic effects in the producer cell.</b>  </p>
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Revision as of 15:13, 15 October 2021


6His-P20 and Flag-Cry11Aa coding sequence

The Part BBa_K3788003 is a part composed with BBa_K3788002 (6his_p20) and BBa_K3788001 (Flag_cry11Aa). Both proteins are Bacillus thuringiensis proteins. P20 chaperon have a histidin tag in Nter, Cry11Aa toxin have a Flag tag in Nter to allow to purified proteins P20 and Cry11Aa; and allow the detection and specific identification by WesterBlot. The gene was optimised for E. coli K12.

To allow the expression in operon, an RBS sequence is added before the ATG of Flag_cry11Aa gene sequence.


Expected sizes :

6His-P20 Flag-Cry11Aa
Lenght of DNA sequence 570 bp 1956 bp
Protein size 20 kDa 70 kDa

Mode of action of Cry toxins:

Cry toxins, in the form of a pro-toxin (inactive), will undergo proteolytic cleavage at their N-terminus end, allowing the unmasking of the zone of interaction with the receptor. Mature Cry toxins recognize glycoprotein-type receptors on the surface of midgut cells, more specifically the microvilli of the apical membranes. The II and III domains, forming 3 β-sheets, allow this interaction. Once recognized, domain I, forming 7 amphipathic α-helices, one of which is hydrophobic, is inserted into the membrane to allow the formation of the pre-pore. From this first step emerges the formation of Cry toxins oligomers and the formation of the pore. This allows ion leakage and cell lysis. Following this, an event cascades lead to sepsis resulting in the death of the insect

Cry11Aa has a toxic action, specific to A. aegypti because its -8 loop, region -4 and domain II loop 3 recognize the mosquito midgut BBMV receptor.


P20 chaperon and Cry11Aa toxin

Was discovered in B.thuringiensis, a p20 gene in operon with cry11Aa and <i<cyt1Aa</i>. Thus, the P20 protein was shown to be necessary for the formation of inclusion bodies of Cry11Aa and Cyt1Aa. P20 would allow a greater production of these toxins and allow their stability (Cyt1Aa would be protected from the proteolytic action before its maturation). The co-production of P20 and Cyt1Aa in E.coli would limit its toxic effects in the producer cell.


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 154
    Illegal XhoI site found at 2438
  • 23
    COMPATIBLE WITH RFC[23]
  • 25
    COMPATIBLE WITH RFC[25]
  • 1000
    COMPATIBLE WITH RFC[1000]