Team:WashU/DesignSynecho

From 2012.igem.org

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=Our Design=
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<br><br><br>
 
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==The Gene==
 
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<div id = "design">
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<h1>Phase II</h1>
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<h3>Design</h3>
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The purpose of phase II is to optimize the expression of the proteins necessary for the production of crocin glycosides and safranal.  Unfortunately, ZCD has been shown to produce inclusion bodies when expressed'' in vivo'' in ''E. coli'' and so an alternative method needed to be developed to create a functional protein.  This was done by following the technique described by Florence Bouvier (The Plant Cell, vol. 15 47-62).
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<img src="https://static.igem.org/mediawiki/igem.org/2/2f/Thiofusion_diagram_2.jpg" ALIGN=RIGHT width="786" border="0" usemap="#map" >
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<img src="http://i128.photobucket.com/albums/p172/kingcobra2010/Gene-design-v4.png"
 
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<br><br>
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==Gene Design==
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We decided to construct 3 genes and put them in a plasmid that could homogeneously recombine in Synechocystis. The 3 genes we chose were [http://www.ncbi.nlm.nih.gov/protein/75146812?report=genbank&log$=prottop&blast_rank=1&RID=Y1R3SV1R01S ZCD], [http://www.ncbi.nlm.nih.gov/protein/33114570?report=genbank&log$=prottop&blast_rank=1&RID=Y1RGDZF001S UGTCS2] and [http://www.ncbi.nlm.nih.gov/protein/15235959?report=genbank&log$=prottop&blast_rank=1&RID=Y1RMH11X01S CrtZ]. CrtZ (β-carotene hydroxylase) makes zeaxanthin from β-carotene. We wanted to include this gene even though Synechocystis produces Zeaxanthin endogenously because we wanted to make sure increase the amount of endogenously produced zeaxanthin produced so that we could produce more product. ZCD (Zeaxanthin 7,8-dioxygenase) and UGTCS2 (Glucosyltransferase 2) were the two enzymes that cleaved zeaxanthin to make our products. In between each gene we added Ribosome binding sites and restriction sites. The ribsome binding sites were necessary for the expression of our construct. The Restriction sites were added so that the genes could be easily cut out of the construct and manipulated. Our terminator was just a regular terminator we found on the parts registry. We optimized the construct for Synechocystis PCC 6803 using a program from DNA 2.0. We submitted the gene to DNA 2.0 to synthesize.
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<h3>Results</h3>
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The soluble protein in the protein which was transformed with the tagged pro was extracted and analyzed by SDS-PAGE gel electrophoresis.  The result showed showed a protein of the target mass that was found primarily in the induced cells. This result was further confirmed by digestion of the band in question using trypsin (Sigma Aldrich, St. Louis) and analyzed using LC-MS (Waters Synapt G2 and HPLC).  <br>
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<img src="https://static.igem.org/mediawiki/2012/5/5f/LCMS_gel.png" width="200">
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<img src="https://static.igem.org/mediawiki/2012/a/a7/Zcd_coveage.png" width="500"><br>
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<img src="https://static.igem.org/mediawiki/2012/d/d9/Screen_Shot_2012-09-14_at_10.46.37_PM.png" width="700">
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<br>
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The information that lead to the development of the this vector tag with ZCD came out of the following paper:
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Bouvier, Florence et al. “Oxidative Remodeling of Chromoplast Carotenoids : Identification of the Carotenoid Dioxygenase CsCCD and CsZCD Genes Involved in Crocus Secondary Metabolite Biogenesis.” 15.January (2003): 47–62.  
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Latest revision as of 00:01, 2 October 2012




Phase II

Design

The purpose of phase II is to optimize the expression of the proteins necessary for the production of crocin glycosides and safranal. Unfortunately, ZCD has been shown to produce inclusion bodies when expressed'' in vivo'' in ''E. coli'' and so an alternative method needed to be developed to create a functional protein. This was done by following the technique described by Florence Bouvier (The Plant Cell, vol. 15 47-62).


Results

The soluble protein in the protein which was transformed with the tagged pro was extracted and analyzed by SDS-PAGE gel electrophoresis. The result showed showed a protein of the target mass that was found primarily in the induced cells. This result was further confirmed by digestion of the band in question using trypsin (Sigma Aldrich, St. Louis) and analyzed using LC-MS (Waters Synapt G2 and HPLC).


The information that lead to the development of the this vector tag with ZCD came out of the following paper: Bouvier, Florence et al. “Oxidative Remodeling of Chromoplast Carotenoids : Identification of the Carotenoid Dioxygenase CsCCD and CsZCD Genes Involved in Crocus Secondary Metabolite Biogenesis.” 15.January (2003): 47–62.

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