Team:Edinburgh/Bacterial/Blue light producer

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Revision as of 18:06, 27 October 2010

Overview: The blue light producer

To produce blue light, we used two systems using the bacterial luciferase from Xenorhabdus luminescens (LuxAB). The standalone LuxAB has an emission peak of 495nm (Figure 1). According to O'Kane and Lee (1985) and others, the addition of lumazine protein LumP shifts the wavelength towards the blue spectrum (478 nm), such that it will be in the correct region to activate the blue light sensor.

Figure 1: Emission spectra of LuxAB (in solid black line). The LuxAB depicted is that from Vibrio campbellii, but sources confirm that other bacterial luciferases produce similar spectral graphs.

Image: Suadee et al. (2008)

Strategy

Last year's Edinburgh team already made both of these parts individually, so all we had to do was fuse them together and add a promoter before. Individual parts were resubmitted in pSB1C3.

Problems

We were experiencing problems with last year’s LuxAB and LumP parts, in that blue and red colonies were growing when they should not be. This was another reason for resubmitting them, as the parts contained in the Registry may have the same problems.

We have also had issues with the instrument used to measure the spectral output. It could not pick up a signal from the tubes despite visible bioluminescence. Hopefully we will be able to characterise these parts more fully before the Jamboree.

BioBricks

Both lumP and luxAB have already been submitted as BioBricks in pSB1A3 by last year's Edinburgh team, but we are re-submitting corrected variants in pSB1C3.

We are also submitting a luxAB-lumP fusion construct in pSB1C3 with a constitutive promoter which can be used for blue light production. We have confirmation of working luxAB with the promoter in question.

BBa_K322139: bacterial luciferase luxAB, updated version of BBa_K216008.

BBa_K322312: luxCDE (required for luxAB expression), updated version of BBa_K216017.

BBa_K322007: lumP (shifts luxAB to blue), updated version of BBa_K216007.

BBa_K322140: luxAB under lac promoter.

BBa_K322141: luxAB and luxCDE under lac promoter.

BBa_K322149: luxAB and lumP composite part.

BBa_K322150: luxAB and lumP under lac promoter.

Characterisation

***

References

O'Kane, D. J. & Lee, J. (1985). Chemical characterization of lumazine protein from Photobacterium leiognathi: comparison with lumazine protein from Photobacterium phosphoreum. Biochemistry 24, 1467-1475.

Suadee, C., Nijvipakul, S., et al. (2008). LuxG Is a Functioning Flavin Reductase for Bacterial Luminescence. J. Bacteriol. 190(5): 1531-1538

Edinburgh 2009 team wiki, https://2009.igem.org/Team:Edinburgh.

Throughout this wiki there are words in bold that indicate a relevance to human aspects. It will become obvious that human aspects are a part of almost everything in iGEM.

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-<p>To produce blue light, we used two systems using the bacterial luciferase from Xenorhabdus luminescens (LuxAB). The standalone LuxAB has an emission peak of 495nm. (<a href="https://static.igem.org/mediawiki/2010/0/09/Ed10-LuxABSpectra.gif">Figure 1</a>). According to <a href="#References">O'Kane and Lee (1985)</a> and others, the addition of lumazine protein shifts the wavelength towards blue (478 nm), to be in the correct region to activate the <a href="https://2010.igem.org/Team:Edinburgh/Bacterial/Blue_light_sensor">blue light sensor</a>. </p>
+<p>To produce blue light, we used two systems using the bacterial luciferase from <i>Xenorhabdus luminescens</i> (LuxAB). The standalone LuxAB has an emission peak of 495nm (<a href="https://static.igem.org/mediawiki/2010/0/09/Ed10-LuxABSpectra.gif">Figure 1</a>). According to <a href="#References">O'Kane and Lee (1985)</a> and others, the addition of lumazine protein LumP shifts the wavelength towards the blue spectrum (478 nm), such that it will be in the correct region to activate the <a href="https://2010.igem.org/Team:Edinburgh/Bacterial/Blue_light_sensor">blue light sensor</a>. </p>
 <center><br><br><p><img src="https://static.igem.org/mediawiki/2010/0/09/Ed10-LuxABSpectra.gif" border="0"/></p><br>
@@ Line 152: / Line 152: @@
 <br>
-<p>Last year’s LuxAB and LumP parts were having some problems (blue and red colonies were growing when they should not be. This was part of the reason for resubmitting them, as the parts in the registry may have the same problems. </p>
+<p>We were experiencing problems with last year’s <a href="http://partsregistry.org/Part:BBa_K216008">LuxAB</a> and <a href="http://partsregistry.org/Part:BBa_K216007">LumP</a> parts, in that blue and red colonies were growing when they should not be. This was another reason for resubmitting them, as the parts contained in the Registry may have the same problems.</p>
-<p>We have also had issues with the instrument used to measure the spectral output. It could not pick up a signal from the tubes despite visible bioluminescence. Hopefully we will be able to characterise these parts more fully before the Jamboree.
-</p>
-</div>
-<div id="body" style="padding: 0px 60px 10px 60px; height: 1356px">
+<p>We have also had issues with the instrument used to measure the spectral output. It could not pick up a signal from the tubes despite visible bioluminescence. Hopefully we will be able to characterise these parts more fully before the Jamboree.</p>
 <br>
 <br>
@@ Line 177: / Line 171: @@
 <p><a href="http://partsregistry.org/Part:BBa_K322149">BBa_K322149</a>: <i>luxAB</i> and <i>lumP</i> composite part.</p>
 <p><a href="http://partsregistry.org/Part:BBa_K322150">BBa_K322150</a>: <i>luxAB</i> and <i>lumP</i> under <i>lac</i> promoter.</p><br>
+<br>
+</div>
+<div id="body" style="padding: 0px 60px 10px 60px; height: 1356px">
+<br>
 <br>