View source for Part:BBa K1031520

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<partinfo>BBa_K1031520 short</partinfo>
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<p>For detailed information concerning HpaR and Ph promoter, please visit <a href="http://2013.igem.org/Team:Peking/Project/BioSensors/HpaR">2013 Peking iGEM Biosensor HpaR</a></p>

<img src="https://static.igem.org/mediawiki/igem.org/c/c9/Peking_Logo.jpg" style="width:960px;"/>
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== '''Structure''' ==


The structure of Pr and Pg promoters are complex, for they are adjacent and many transcription factors besides HpaR including IHF and CRP participate. Pr and Pg are in the opposite direction.  
The two binding sites for HpaR, OPR1 and OPR2, perform obvious synergistic effect, making the two operons, hpaR and hpaGEDFHI coordinate with each other on transcription level  ('''Fig 1''')

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<img src="https://static.igem.org/mediawiki/igem.org/9/93/Peking2013_HpaRFig5.jpg", width=700px; />
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'''Fig 1'''  Structure of the intergenic region between hpaR and hpaG (Galán, B. et al, 2003). The elements of the promoters are enclosed by square. Especially, two OPRs responsible for HpaR binding are marked. The transcription direction of hpaR and hpaG are indicated with arrows. The IHF and CRP sites are marked respectively.


== '''Sequence and Features''' ==


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<span class='h3bb'>Sequence and Features</span>
<partinfo>BBa_K1031520 SequenceAndFeatures</partinfo>



== '''Construction and tunning''' ==


''Pc'' promoter J23106 is selected to initiate the transcription of hpaR. Based on this circuit, we constructed a library of RBS (Ribosome Binding Site) for tunning for expression level of reporter gene sfGFP ('''Fig 2'''). K1031520 is composed of three elements, Pg promoter regulated by HpaR, RBS B0031[https://parts.igem.org/Part:BBa_B0031] and reporter gene sfGFP. However, we haven`t got the obvious induction ratio. It is hypothesized that several overall-controlling sites are located in the promoter. Bacteria will control strictly the expression of the relative genes in rich condition.

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<img src="https://static.igem.org/mediawiki/igem.org/b/bc/Peking2013_part_31-Pg_HpaR.png", width=400px; />
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'''Fig 2''' Construction of reporter circuit. The orange arrow represents ''Pg'' promoter. The green oval stands for RBS B0031. sfGFP coding sequence is shown with dark blue, while terminator B0015[https://parts.igem.org/Part:BBa_B0015] is in dark red. 




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===Functional Parameters===
<partinfo>BBa_K1035201113 parameters</partinfo>
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