Team/CINVESTAV-IPN-UNAM MX/Lightandoxre.htm

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<img src="https://static.igem.org/mediawiki/2012/4/40/Oxy01.jpg" alt="oxy01" width="561" height="241">
<img src="https://static.igem.org/mediawiki/2012/4/40/Oxy01.jpg" alt="oxy01" width="561" height="241">
<p>Figure 1. This BioBrick will show if our dependent promoter is functional, using the
<p>Figure 1. This BioBrick will show if our dependent promoter is functional, using the
-
constitutive (or natural) system from R. sphaeroides or the orthologue system from R.palustris.</p>
+
constitutive (or natural) system from <em>R. sphaeroides</em> or the orthologue system from <em>R.palustris.</em></p>
<img src="https://static.igem.org/mediawiki/2012/1/1c/Oxy02.jpg" width="563" height="183">
<img src="https://static.igem.org/mediawiki/2012/1/1c/Oxy02.jpg" width="563" height="183">
<p>Figure 2. This BioBrick will show if our complete system is functional because probably
<p>Figure 2. This BioBrick will show if our complete system is functional because probably
we need a synthetic system to promote GFP expression by binding its target sequence
we need a synthetic system to promote GFP expression by binding its target sequence
-
(dependent promoter) in R. palustris.</p>
+
(dependent promoter) in <em>R. palustris.</em></p>
-
<p>Both systems were cloned in pRK415 because it is a vector for Purple Non-Sulfur
+
<p>Both systems were cloned in pRK415 because this is a vector for Purple Non-Sulfur
-
Photosynthetic Bacteria, the plasmids were introduced in R. sphaeroides and R. palustris,
+
Photosynthetic Bacteria, the plasmids were introduced in <em>R. sphaeroides</em> and <em>R.palustris</em>,
by biparental and triparental conjugation.</p>
by biparental and triparental conjugation.</p>
<p>The measurement approach was:
<p>The measurement approach was:
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</p><br>
</p><br>
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<p>For all data results, we considered a negative control: Rhodobacter sphaeroides and
+
<p>For all data results, we considered a negative control: <em>R. sphaeroides</em> and
-
  Rhodopseudomonas palustris, conjugated bacteria with pRK415 vector without BioBrick.</p>
+
  <em>R.palustris</em>, conjugated bacteria with pRK415 vector without BioBrick.</p>
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  <div align="center"><object classid="clsid:d27cdb6e-ae6d-11cf-96b8-444553540000" codebase="http://fpdownload.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=8,0,0,0" width="560" height="400" id="oxy07" align="middle">
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  <div align="center"><img src="https://static.igem.org/mediawiki/2012/f/f0/Oxygenres01.jpg" width="563" height="452">
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<param name="allowScriptAccess" value="sameDomain" />
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<img src="https://static.igem.org/mediawiki/2012/c/cc/Oxygenres02.jpg" width="563" height="452">
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<param name="movie" value="https://static.igem.org/mediawiki/2012/9/95/Oxy07.swf" /><param name="quality" value="high" /><param name="bgcolor" value="#dfdfdf" /><embed src="https://static.igem.org/mediawiki/2012/9/95/Oxy07.swf" quality="high" bgcolor="#dfdfdf" width="560" height="400" name="oxy07" align="middle" allowScriptAccess="sameDomain" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer" />
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<p>Figure 3. Percentage of bacterial population expressing GFP..<br>
-
</object><br><br>
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</p>
   <img src="https://static.igem.org/mediawiki/2012/9/9b/Oxy03.jpg" width="561" height="465"></div>
   <img src="https://static.igem.org/mediawiki/2012/9/9b/Oxy03.jpg" width="561" height="465"></div>
  <div align="center">
  <div align="center">
  </div>
  </div>
-
  <p>Figure 4. Images obtained by fluorescence microscopy (dark field), where our systems
+
  <p>Figure 4. Images obtained by fluorescence microscopy, where our systems
  were functional in the expected conditions.</p>
  were functional in the expected conditions.</p>
<p id="text2">Discussion</p>
<p id="text2">Discussion</p>
-
<p>In R. sphaeroides, the best functionality of our system was in aerobic and darknesss
+
<p>In <em>R. sphaeroides</em>, the best functionality of our system was in aerobic and darknesss
-
  condition, it was not the expected result, but probably the activation is due to the
+
  condition, it was not the expected result, but probably the activation is because to the
  incomplete repression of the system because we were overexpressing the constitutive
  incomplete repression of the system because we were overexpressing the constitutive
  proteins. Altought, we obtained GFP expression with a lower level, in the expected
  proteins. Altought, we obtained GFP expression with a lower level, in the expected
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<br>
<br>
-
  In R. palustris, we had a good response in the expected condition, our Light and Oxygen
+
  In <em>R.palustris</em>, our best condition was in anaerobic and light condition, expected result. The low level of GFP in BioBrick BBa_K77608 it could be due to low affinity of orthologous proteins to our promoter sequence, but when we introduced the complete system BBa_K776020 GFP expression increases showing the funcionality of our system. </p>
-
Control System is functional in anaerobic and light condition because we had a lower GFP level in BioBrick BBa_K77608 because orthologous proteins probably have a low affinity by this sequence, but when we introduced the complete system BBa_K776020, the
+
-
synthetic system promoted the GFP expression.</p>
+
   
   
  <p id="text2">Conclusion</p>
  <p id="text2">Conclusion</p>
-
  <p>Our two BioBricks (K776018 and BBa_K776020) are functional in two photosynthetic
+
  <p>Both BioBricks (K776018 and BBa_K776020) are functional in two photosynthetic
-
  bacteria R. palustris and R. sphaeroides. This is a functional system for controlling genetic
+
  bacteria <em>R.palustris</em> and <em>R. sphaeroides.</em> The best condicion was aerobic/darknes and anaerobic light respectively.
-
expression with Light and Oxygen signals.</p>
+
 
 +
 
 +
This is a functional system for controlling genetic expression with Light and Oxygen signals.</p>
</div>
</div>
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<li><a href="Lightandoxre.htm">Light and oxygen response</a></li>
<li><a href="Lightandoxre.htm">Light and oxygen response</a></li>
<li><a href="Notebook.htm">Notebook</a></li>
<li><a href="Notebook.htm">Notebook</a></li>
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<li><a href="oxigenresponse.htm">Oxigen response</a></li>
+
<li><a href="oxigenresponse.htm">Oxygen response</a></li>
<li><a href="Protocol.htm">Protocols</a></li>
<li><a href="Protocol.htm">Protocols</a></li>
</ul>
</ul>
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<!-- end #page -->
<!-- end #page -->
<div id="piep">
<div id="piep">
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<p align="center"> Rhodofactory 2012 </p>
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<p align="center"> <strong>Rhodofactory 2012</strong> </p>
<div id="sponsors">
<div id="sponsors">
  <div align="center"><img src="https://static.igem.org/mediawiki/2012/8/8a/Icytdf.png" alt="icytdf" width="90" height="82" /></div>
  <div align="center"><img src="https://static.igem.org/mediawiki/2012/8/8a/Icytdf.png" alt="icytdf" width="90" height="82" /></div>

Latest revision as of 22:59, 26 October 2012

Rho

Light and oxygen response!

AppA/PpsR Regulation System

In this repressor/antirepressor system, under low oxygen tension, the GFP expression is possible because the repressor PpsR is forming a complex with the antirepresssor protein AppA. Moreover, when blue light fall upon the complex, a conformational change in AppA breaks the complex, and AppA avoid GFP expression. (See Rhodofactory section for a complete explanation).

We made two BioBricks (BBa_K776018 y BBa_K776020) to test the Light & Oxygen Control System, each one has GFP as a reporter gene and the functionality was related to the fluorescence detection.

oxy01

Figure 1. This BioBrick will show if our dependent promoter is functional, using the constitutive (or natural) system from R. sphaeroides or the orthologue system from R.palustris.

Figure 2. This BioBrick will show if our complete system is functional because probably we need a synthetic system to promote GFP expression by binding its target sequence (dependent promoter) in R. palustris.

Both systems were cloned in pRK415 because this is a vector for Purple Non-Sulfur Photosynthetic Bacteria, the plasmids were introduced in R. sphaeroides and R.palustris, by biparental and triparental conjugation.

The measurement approach was:

  • Fluorescence Microscopy: To have a qualitative GFP detection in these bacteria.
  • Flow Cytometry: To have a quantitative GFP detection, we calculated the percentage of bacterial population expressing GFP (GFP+) in 1000 bacteria.

  • We used 3 environmental growing conditions:

  • Aerobic/Darkness
  • Anaerobic/Light
  • Anaeroibic/darkness

  • For all data results, we considered a negative control: R. sphaeroides and R.palustris, conjugated bacteria with pRK415 vector without BioBrick.

    Figure 3. Percentage of bacterial population expressing GFP..

    Figure 4. Images obtained by fluorescence microscopy, where our systems were functional in the expected conditions.

    Discussion

    In R. sphaeroides, the best functionality of our system was in aerobic and darknesss condition, it was not the expected result, but probably the activation is because to the incomplete repression of the system because we were overexpressing the constitutive proteins. Altought, we obtained GFP expression with a lower level, in the expected condition, both BioBricks (BBa_K776018 y BBa_K776020) were functional.

    In R.palustris, our best condition was in anaerobic and light condition, expected result. The low level of GFP in BioBrick BBa_K77608 it could be due to low affinity of orthologous proteins to our promoter sequence, but when we introduced the complete system BBa_K776020 GFP expression increases showing the funcionality of our system.

    Conclusion

    Both BioBricks (K776018 and BBa_K776020) are functional in two photosynthetic bacteria R.palustris and R. sphaeroides. The best condicion was aerobic/darknes and anaerobic light respectively. This is a functional system for controlling genetic expression with Light and Oxygen signals.

     

    Rhodofactory 2012

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