Team:Bielefeld-CeBiTec/Notebook/Journal/CO2-fixation/Aug

From 2014.igem.org

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             <div class="content"  style="margin-right:10%; margin-left:10%">
             <div class="content"  style="margin-right:10%; margin-left:10%">
                 <ul> <!-- gesamte Liste -->
                 <ul> <!-- gesamte Liste -->
-
<li><b>Promotors T7, p<sub>tac</sub> and p<sub>Tet</sub> <a href="http://parts.igem.org/wiki/index.php?title=Part:BBa_K1465213" target="_blank">(BBa_K1465213 (pSB1C3_p<sub>tac</sub>_Hneap)</a>, <a href="http://parts.igem.org/wiki/index.php?title=Part:BBa_K1465212" target="_blank">BBa_K1465212 (pSB1C3_p<sub>tac</sub>))</a></b></li>
+
<li><b>Promoters T7, p<sub>tac</sub> and p<sub>Tet</sub> <a href="http://parts.igem.org/wiki/index.php?title=Part:BBa_K1465213" target="_blank">(BBa_K1465213 (pSB1C3_p<sub>tac</sub>_Hneap)</a>, <a href="http://parts.igem.org/wiki/index.php?title=Part:BBa_K1465212" target="_blank">BBa_K1465212 (pSB1C3_p<sub>tac</sub>))</a></b></li>
                   <ul> <!-- Promotors -->
                   <ul> <!-- Promotors -->
-
                     <li>We tried to assemble some inserts with three different promotors to test which one is the best  choice.</li>
+
                     <li>We tried to assemble some inserts with three different promoters to test which one is the best  choice.</li>
                     <ul>
                     <ul>
                       <li><a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Notebook/Protocols#PurificationPromega" target="_blank">Plasmid isolation</a> of p<sub>tac</sub>, p<sub>tac</sub>, T7, <i>prkA, Hneap, sRNA:pfkA</i> and <i> can </i></li>
                       <li><a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Notebook/Protocols#PurificationPromega" target="_blank">Plasmid isolation</a> of p<sub>tac</sub>, p<sub>tac</sub>, T7, <i>prkA, Hneap, sRNA:pfkA</i> and <i> can </i></li>
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        <li>Bands not as expected</li>
        <li>Bands not as expected</li>
                         &rarr; Showed in all cases a band 400 bp over the expected value. We tried to extract and   
                         &rarr; Showed in all cases a band 400 bp over the expected value. We tried to extract and   
-
                         <a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Notebook/Protocols#Transformationviaelectroporation" target="_blank">transform</a> the promotor from another distribution plate (2013)
+
                         <a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Notebook/Protocols#Transformationviaelectroporation" target="_blank">transform</a> the promoter from another distribution plate (2013)
              </ul>
              </ul>
                       <li><a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Notebook/Protocols#ColonyPCR" target="_blank">Colony PCR</a> of pSB1K3_p<sub>Tet</sub>_prkA, pSB1K3_<sub>Tet</sub>_Hneap
                       <li><a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Notebook/Protocols#ColonyPCR" target="_blank">Colony PCR</a> of pSB1K3_p<sub>Tet</sub>_prkA, pSB1K3_<sub>Tet</sub>_Hneap
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<br>
<br>
-
<li><b><i>Purification of the carboxysome</b></i></li>
+
<li><b>Purification of the carboxysome</b></li>
                 <ul>
                 <ul>
-
                     <li>We want to express and purify the carboxysome based on the plasmid pHnCBcsoS1D, which we received from addgene. The procedure is based on methods described by <a href="#bonacci2011">Bonacci et al., 2011</a> and <a href="#so2004">So et al., 2004</a>; </li>
+
                     <li>We want to express and purify the carboxysome based on the plasmid pHnCBcsoS1D, which we received from addgene. The procedure is based on methods described by <a href="http://www.pnas.org/content/109/2/478" target="_blank"">Bonacci et al., 2011</a> and <a href="#http://www.ncbi.nlm.nih.gov/pmc/articles/PMC321498/pdf/1109.pdf">So et al., 2004</a>. </li>
                     <ul>
                     <ul>
                       <li>Grow cells containing the pHnCBcsoS1D in <a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Notebook/Media#TBmedium" target="_blank">TB medium </a> containing antibiotic at 20 °C overnight</li>
                       <li>Grow cells containing the pHnCBcsoS1D in <a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Notebook/Media#TBmedium" target="_blank">TB medium </a> containing antibiotic at 20 °C overnight</li>
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<li> Induce protein expression by adding IPTG to a final concentration of 50 µM. Grow cells overnight </li>
<li> Induce protein expression by adding IPTG to a final concentration of 50 µM. Grow cells overnight </li>
<li> Harvest cells by centrifugation with 4500 x g for 20 min at 4 °C </li>
<li> Harvest cells by centrifugation with 4500 x g for 20 min at 4 °C </li>
-
<li> Resuspend cells in 50 mL TEMB buffer. Use protease inhibitors, for example PMSF.
+
<li> Resuspend cells in 50 mL TEMB buffer. Use protease inhibitors, for example PMSF
              <ul>  
              <ul>  
            TEMB buffer:  
            TEMB buffer:  
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<li> 20 mM NaHCO<sub>3</sub> </li>
<li> 20 mM NaHCO<sub>3</sub> </li>
              </ul>  
              </ul>  
-
<li> Cell lysis via sonification (6 x 1 min with 1 min cooling interval between every cycle). Therefore a (<a href="http://www.sigmaaldrich.com/germany.html" target="_blank">Bandelin</a> Sonopuls HD 2070 with a SH70G with a power of 79 W was used. The power was adjust to 70 % </li>
+
<li> Cell lysis via sonification (6 x 1 min with 1 min cooling interval between every cycle). Therefore a <a href="http://www.sigmaaldrich.com/germany.html" target="_blank">Bandelin</a> Sonopuls HD 2070 with a SH70G with a power of 70 W was used. The power was adjust to 70&nbsp;% </li>
<li> Centrifuge the disruptet cell material with 12,000 x g for 30 min at 4 °C to spin down cell debris. The cellular proteins should be in the supernatant. </li>
<li> Centrifuge the disruptet cell material with 12,000 x g for 30 min at 4 °C to spin down cell debris. The cellular proteins should be in the supernatant. </li>
<li>Collect the supernatant and centrifuge with 40,000 x g for 30 min at 4 °C </li>
<li>Collect the supernatant and centrifuge with 40,000 x g for 30 min at 4 °C </li>
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<li> Centrifuge again with 40,000 x g for 30 min at 4 °C </li>
<li> Centrifuge again with 40,000 x g for 30 min at 4 °C </li>
<li> Discard supernatant. Resuspend pellet in 3 mL TEMB buffer. Clarify by centrifugation with 3,000 x g for 1 min </li>
<li> Discard supernatant. Resuspend pellet in 3 mL TEMB buffer. Clarify by centrifugation with 3,000 x g for 1 min </li>
-
<Load the supernatant onto 10 to 50 % (wt/vol) linear sucrose gradient. Sucrose gradients are made by slowly dribbling high % to low % sucrose down the side of the tube. Ultraspin the sample in with 105,000 x g for 30 min </li>
+
<li> Load the supernatant onto 10 to 50 % (wt/vol) linear sucrose gradient. Sucrose gradients are made by slowly dribbling high % to low % sucrose down the side of the tube. For ultracentrifugation Polyallomer tubes with a volume of 13,2 mL were used. Ultraspin the sample in a Beckman Coulter Optima<sup>TM</sup> LE 80 K Ultracentrifuge with a SW41 Ti Swinging Rotor Bucket with 105,000 x g for 30 min </li>
-
<li> After centrifugation, the carboxysome should be seen as a band near the middle of the gradient. </li>
+
<li> After centrifugation, the carboxysome should be seen as a band near the middle of the gradient </li>
-
&rarr; The purification was not succesful, as you could not recognize a visible band in the gradient.
+
&rarr; The purification was not succesful, as you could not recognize a visible band in the gradient  
                     </ul>  
                     </ul>  
                      
                      
                 </ul>  
                 </ul>  
-
 
-
 
-
 
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                     <ul>
                     <ul>
                       <li><a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Notebook/Protocols#Transformationviaelectroporation" target="_blank">Transformation</a> with electrocompotetent cells</li>
                       <li><a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Notebook/Protocols#Transformationviaelectroporation" target="_blank">Transformation</a> with electrocompotetent cells</li>
-
                       <font color="red"><li><a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Notebook/Protocols#ColonyPCR" target="_blank">Colony PCR</a> (<a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Notebook/Primer#Primer1" target="_blank">Primer1</a>, <a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Notebook/Primer#Primer2" target="_blank">Primer2</a>)
+
                       <li><a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Notebook/Protocols#ColonyPCR" target="_blank">Colony PCR</a> (<a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Notebook/Primer#prkA_pHn_rev" target="_blank">prkA_pHn_rev</a>, <a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Notebook/Primer#prkA_pHn_fwd" target="_blank">prkA_pHn_fwd</a>)
                       </li>
                       </li>
              <ul>
              <ul>
-
        <li>Annealing temperature: ...</li>
+
        <li>Annealing temperature: 55°C </li>
-
        <li>Bands (not) as expected (~... bp)</li>
+
        <li>Bands not as expected</li>
-
              </ul></font>
+
                        &rarr; We got a lot of bands and could not interpret the result.
 +
              </ul>
                     </ul>
                     </ul>
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                 <li><b><i>prkA</i> and <i>p<sub>Tet</i></b></li>
                 <li><b><i>prkA</i> and <i>p<sub>Tet</i></b></li>
        <ul>
        <ul>
-
  <li>This week we tried to assemble the <i>p<sub>Tet</sub></i> promotor with the <i>prkA</i>.</li>  
+
  <li>This week we tried to assemble the <i>p<sub>Tet</sub></i> promoter with the <i>prkA</i>.</li>  
                   <ul>
                   <ul>
                     <li><a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Notebook/Protocols#BioBrick" target="_blank">BioBrick Assembly</a> (Suffix)</li>
                     <li><a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Notebook/Protocols#BioBrick" target="_blank">BioBrick Assembly</a> (Suffix)</li>
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<li><b><i>Hneap</i> and <i>p<sub>Tet</i></b></li>
<li><b><i>Hneap</i> and <i>p<sub>Tet</i></b></li>
        <ul>
        <ul>
-
  <li>This week we tried to assemble the <i>p<sub>Tet</sub></i> promotor with the <i>Hneap</i>.</li>  
+
  <li>This week we tried to assemble the <i>p<sub>Tet</sub></i> promoter with the <i>Hneap</i>.</li>  
                   <ul>
                   <ul>
                     <li><a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Notebook/Protocols#BioBrick" target="_blank">BioBrick Assembly</a> (Suffix)</li>
                     <li><a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Notebook/Protocols#BioBrick" target="_blank">BioBrick Assembly</a> (Suffix)</li>
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                       <ul>
                       <ul>
                         <li><a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Notebook/Protocols#BluntEnd" target="_blank">Blunt-End</a> cloning of <i>sap_2</i> in the pJet vector</li>
                         <li><a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Notebook/Protocols#BluntEnd" target="_blank">Blunt-End</a> cloning of <i>sap_2</i> in the pJet vector</li>
-
                         <li><font color="red"> <a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Notebook/Protocols#ColonyPCR" target="_blank">Colony PCR</a> (<a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Notebook/Primer#Primer1" target="_blank">Primer1</a>, <a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Notebook/Primer#Primer2" target="_blank">Primer2</a>)
+
                         <li><a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Notebook/Protocols#ColonyPCR" target="_blank">Colony PCR</a> (<a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Notebook/Protocols#BluntEnd" target="_blank">Primer of pJet set</a>)
                         </li>
                         </li>
                <ul>
                <ul>
-
          <li>Annealing temperature: ... °C</li>
+
          <li>Annealing temperature: 55 °C</li>
-
          <li>Bands as expected (~1500 bp)</li></font>
+
          <li>Bands as expected (~1500 bp)</li>
                           <div class="element" style="height:350px; width:120px; text-align:center">
                           <div class="element" style="height:350px; width:120px; text-align:center">
                             <a href="https://static.igem.org/mediawiki/2014/0/06/Bielefeld_CeBiTec_2014-09-25_sap_2_cPCR%28pJet%29_08_21.png" target="_blank"><img src="https://static.igem.org/mediawiki/2014/0/06/Bielefeld_CeBiTec_2014-09-25_sap_2_cPCR%28pJet%29_08_21.png" height="230px"></a><br><font size="1">Agarose gel from colony PCR. As a Ladder we used <a href="http://www.thermoscientificbio.com/nucleic-acid-electrophoresis/generuler-1-kb-dna-ladder-ready-to-use-250-to-10000-bp">GeneRuler™ 1 kb DNA Ladder from Thermo Scientific</a>. </font>
                             <a href="https://static.igem.org/mediawiki/2014/0/06/Bielefeld_CeBiTec_2014-09-25_sap_2_cPCR%28pJet%29_08_21.png" target="_blank"><img src="https://static.igem.org/mediawiki/2014/0/06/Bielefeld_CeBiTec_2014-09-25_sap_2_cPCR%28pJet%29_08_21.png" height="230px"></a><br><font size="1">Agarose gel from colony PCR. As a Ladder we used <a href="http://www.thermoscientificbio.com/nucleic-acid-electrophoresis/generuler-1-kb-dna-ladder-ready-to-use-250-to-10000-bp">GeneRuler™ 1 kb DNA Ladder from Thermo Scientific</a>. </font>
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        <li><b>Purification vector</b></li>
        <li><b>Purification vector</b></li>
        <ul>
        <ul>
-
    <li>This week we tried to amplify the T7_RBS promotor for the purification vector.</li>
+
    <li>This week we tried to amplify the T7_RBS promoter for the purification vector. Additionally we amplified the intein tag containing a chitin binding domain.</li>
                     <ul>
                     <ul>
-
                       <font color="red"><li><a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Notebook/Protocols#PCR" target="_blank">PCR amplification</a> (<a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Notebook/Primer#Primer1" target="_blank">Primer1</a>, <a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Notebook/Primer#Primer2" target="_blank">Primer2</a>)</li>
+
                       <li><a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Notebook/Protocols#PCR" target="_blank">PCR amplification</a> (<a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Notebook/Primer#RBS_int_rev" target="_blank">RBS_int_rev</a>, <a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Notebook/Primer#pSB1C3_int_fw" target="_blank">pSB1C3_int_fw</a>) of the promoter (T7_RBS)</li>
              <ul>
              <ul>
-
          <li>Annealing temperature: ...</li>
+
          <li>Annealing temperature: 55°C</li>
-
          <li>Bands (not) as expected (... bp)</li>
+
          <li>Bands as expected (~2000 bp)</li>
-
              </ul></font>
+
              </ul>
 +
                      <li><a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Notebook/Protocols#PCR" target="_blank">PCR amplification</a> (<a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Notebook/Primer#int_RBS_fw" target="_blank">int_RBS_fw</a>, <a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Notebook/Primer#int_pSB1C3_rev" target="_blank">int_pSB1C3_rev</a>) the intein tag with chitin binding domain (<i>intCBD</i>)</li>
 +
              <ul>
 +
          <li>Annealing temperature: 55°C</li>
 +
          <li>Bands as expected (~1000 bp)</li>
 +
              </ul>
 +
                      <li>PCR products were <a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Notebook/Protocols#DNAPurificationbyCentrifugation" target="_blank">purified</a></li>
 +
                      <li><a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Notebook/Protocols#Gibson" target="_blank">Gibson Assembly</a> with T7_RBS and <i>intCBD</i></li>
 +
                      <li><a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Notebook/Protocols#Transformationviaelectroporation" target="_blank">Transformation</a> with electrocompotetent cells</li>
 +
                      <li><a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Notebook/Protocols#ColonyPCR" target="_blank">Colony PCR</a> (<a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Notebook/Primer#VF-Primer" target="_blank">VF-Primer</a>, <a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Notebook/Primer#VR-Primer" target="_blank">VR-Primer</a>)
 +
            </li>
 +
<ul>
 +
<li>Annealing temperature: 55°C</li>
 +
<li>Bands as expected (~3300 bp)</li>
 +
</ul>
 +
              <li><a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Notebook/Protocols#PurificationPromega" target="_blank">Plasmid isolation</a> of pSB1C3_T7_RBS_intCBD</li>
 +
 
                     </ul>
                     </ul>
        </ul>             
        </ul>             
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                     <li>As the purification of the carboxysome showed no results, we decided to induce protein expression with higher concentrations of IPTG.  </li>
                     <li>As the purification of the carboxysome showed no results, we decided to induce protein expression with higher concentrations of IPTG.  </li>
                     <ul>
                     <ul>
-
<li> Cultivation was carried out using a modified method of <a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Notebook/Protocols#Cultivation%20for%20Expression%20of%20recombinant%20proteins" target="_blank">Cultivation for Expression of recombinant proteins </a>. Cells were continous cultivated by a temperature of 20 °C, and protein expressing was induced when the culture reaches an OD<sub>600</sub> of 0.9 - 1.2. IPTG in final concentrations of 0.5 mM, 2 mM and 5 mM was used.
+
<li> Cultivation was carried out using a modified method of <a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Notebook/Protocols#Cultivation%20for%20Expression%20of%20recombinant%20proteins" target="_blank">Cultivation for Expression of recombinant proteins </a>. Cells were continous cultivated by a temperature of 20 °C, and protein expression was induced when the culture reaches an OD<sub>600</sub> of 0.9 - 1.2. IPTG in different final concentrations of 0.5 mM, 2 mM and 5 mM was used to verify the expression of the carboxysomal proteins through <a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Notebook/Protocols#Sodiumdodecylsulfatepolyacrylamidegelelectrophoresis%20%28SDS-PAGE%29" target="_blank">SDS-PAGE </a> and <a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Notebook/Protocols#Matrix-assistedLaserDesorption/Ionization%E2%80%93Timeofflight%20%28MALDI-TOF%29" target="_blank">MALDI-TOF </a> . Samples were generated using the protocol for <a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Notebook/Protocols#FastCellLysisforSDS-PAGE" target="_blank">Fast Cell Lysis for SDS-PAGE. </a>
-
 
+
<center>
-
                    </ul>  
+
<table style="background-color:transparent">
-
                   
+
<tr>
-
                </ul>  
+
  <td>
 +
<div class="element" style="margin:10px; padding:10px; text-align:center; width:220px">
 +
      <a href="https://static.igem.org/mediawiki/2014/e/ec/Bielefeld-CeBiTec_14-10-16_pHnCBcsoS1D_0.5_mM.jpg" target="_blank"><img src="https://static.igem.org/mediawiki/2014/e/ec/Bielefeld-CeBiTec_14-10-16_pHnCBcsoS1D_0.5_mM.jpg" width="220px"></a><br>
 +
<font size="1" style="text-align:center;">Proteinexpression of pHnCBcsoS1D <br>induced with 0.5 mM IPTG</font>
 +
</div>
 +
  </td>
 +
  <td>
 +
<div class="element" style="margin:10px; padding:10px; text-align:center; width:220px">
 +
      <a href="https://static.igem.org/mediawiki/2014/c/cf/Bielefeld-CeBiTec_14-10-16_pHnCBcsoS1D_2_mM.jpg" target="_blank"><img src="https://static.igem.org/mediawiki/2014/c/cf/Bielefeld-CeBiTec_14-10-16_pHnCBcsoS1D_2_mM.jpg" width="220px"></a><br>
 +
<font size="1" style="text-align:center;">Proteinexpression of pHnCBcsoS1D <br>induced with 2 mM IPTG</font>
 +
</div>
 +
  </td>
 +
  <td>
 +
<div class="element" style="margin:10px; padding:10px; text-align:center; width:220px">
 +
      <a href="https://static.igem.org/mediawiki/2014/a/af/Bielefeld-CeBiTec_14-10-16_pHnCBcsoS1D_5_mM.jpg" target="_blank"><img src="https://static.igem.org/mediawiki/2014/a/af/Bielefeld-CeBiTec_14-10-16_pHnCBcsoS1D_5_mM.jpg" width="220px"></a><br>
 +
<font size="1" style="text-align:center;">Proteinexpression of pHnCBcsoS1D <br>induced with 5 mM IPTG</font>
 +
</div>
 +
  </td>
 +
</tr>
 +
</table>
 +
</center>
 +
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<ul>
<ul>
<li>Annealing temperature: 55 °C</li>
<li>Annealing temperature: 55 °C</li>
-
<li>Bands as expected (~900 bp)</li>
+
<li>Bands as expected (~600 bp)</li>
 +
                <div class="element" style="height:350px; width:120px; text-align:center">
 +
                      <a href="https://static.igem.org/mediawiki/2014/2/27/Bielefeld_CeBiTec_2014-10-17_T7_sRNA_pfkA_cPCR_08_27.png" target="_blank"><img src="https://static.igem.org/mediawiki/2014/2/27/Bielefeld_CeBiTec_2014-10-17_T7_sRNA_pfkA_cPCR_08_27.png" height="230px"></a><br><font size="1">Agarose gel from colony PCR. As a Ladder we used <a href="http://www.thermoscientificbio.com/nucleic-acid-electrophoresis/generuler-1-kb-dna-ladder-ready-to-use-250-to-10000-bp">GeneRuler™ 1 kb DNA Ladder from Thermo Scientific</a>. </font>
 +
                    </div>
 +
 
</ul>
</ul>
<ul>
<ul>
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                 </ul>
                 </ul>
               </ul>           
               </ul>           
 +
<br>
-
 
+
<li><b><i>Purification of the carboxysome</b></i></li>
 +
                <ul>
 +
                    <li>The results of our experiments suggest that higher IPTG concentrations are needed for a efffective protein expression of the carboxysome. For this reason, we induced the protein expression with a final IPTG concentration of 0,5 mM. The purification was carried out using the protocol as described in our <a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Notebook/Journal/CO2-fixation/Aug#Week2" target="_blank"> labjournal </a>, but slightly modificated. The culture volumen was upscaled to 1 litre. For a more effective cell lysis, the sonification protocol was modified using eight cylces a one min with one min cooling intervals for sonification. </li>
 +
                   
 +
&rarr; The purification was not succesful, as you could not recognize a visible band in the gradient.
 +
                    </ul>
 +
                   
 +
                </ul>
</ul>
</ul>

Latest revision as of 00:20, 18 October 2014


August

  • Promoters T7, ptac and pTet (BBa_K1465213 (pSB1C3_ptac_Hneap), BBa_K1465212 (pSB1C3_ptac))
    • We tried to assemble some inserts with three different promoters to test which one is the best choice.
      • Plasmid isolation of ptac, ptac, T7, prkA, Hneap, sRNA:pfkA and can
      • BioBrick Assembly (Suffix)
        • Backbones (digested with SpeI, PstI)
          • pSB1A2_T7
          • pSB1C3_ptac
          • pSB1K3_pTet
        • Inserts (digested with XbaI, PstI)
          • prkA
          • Hneap
          • sRNA:pfkA
      • Transformation of all constructs with electrocompotetent cells
      • Colony PCR of pSB1C3_ptac_prkA, pSB1C3_ptac_Hneap and pSB1C3_ptac_sRNA:pfkA (VF-Primer, VR-Primer)
        • Annealing temperature: 55 °C
        • Bands as expected (~2500 bp (ptac_prkA), ~3200 bp (ptac_Hneap), ~1700 bp (ptac_sRNA:pfkA))
      • Colony PCR of pSB1A2_T7_prkA, pSB1A2_T7_Hneap and pSB1A2_T7_sRNA:pfkA (VF-Primer, VR-Primer)
        • Annealing temperature: 55 °C
        • Bands not as expected
        • → Showed in all cases a band 400 bp over the expected value. We tried to extract and transform the promoter from another distribution plate (2013)
      • Colony PCR of pSB1K3_pTet_prkA, pSB1K3_Tet_Hneap and pSB1K3_Tet_sRNA:pfkA (VF-Primer, VR-Primer)
        • Annealing temperature: 55 °C
        • Bands not as expected
        • → We tried it again.
      • Colony PCR of pSB1A2_T7 from the 2013 distribution plate (VF-Primer, VR-Primer)
        • Annealing temperature: 55 °C
        • Bands as expected (~300 bp)
      • Plasmid isolation of pSB1C3_ptac_prkA, pSB1C3_ptac_Hneap, pSB1C3_ptac_sRNA_pfkA and pSB1A2_T7

  • csoS1-4 (shell proteins csoS4AB and csoS1CAB)

  • can and csoS1-4
    • We tried to assemble the shell proteins and the carbonic anhydrase for the carboxysome.
    • → After we got the sequencing results of pSB1C3_can we found out that we have some mutations so this construct has to be made again with the right sequence of can.

  • glpX

  • prkA and pHnCBscoS1D

  • RuBisCO
    • We tried to assemble both RuBisCO with pSB1C3_ptac_prkA
      • BioBrick Assembly (Suffix)
        • Backbone (digested with SpeI, PstI)
          • ptac_prkA
        • Inserts (digested with XbaI, PstI)
          • Hneap
          • SELAN
        • We assembled pSB1C3_ptac_prkA with Hneap respectively SELAN
      • Colony PCR (VF-Primer, VR-Primer)
        • Annealing temperature: 55 °C
          • pSB1C3_ptac_prkA_Hneap
            • Bands not as expected (too short).
            • → We will try to ligate pSB1C3_ptac_prkA and Hneap again.
          • pSB1C3_ptac_prkA_SELAN
            • Bands as expected (~4200 bp)
      • Plasmid isolation of ptac_prkA_Hneap and ptac_prkA_SELAN
      → Because of the mutations in Selan we cannot use this construct. Also the restriction digestion of pSB1C3_ptac_prkA_Hneap was not successful.

  • can_csoS1-4 and csoS1D
    • We tried to assemble pSB1C3_can_csoS1-4 and csoS1D and transform the construct.
    • → After we got the sequencing results of pSB1C3_can we found out that we have some mutations so this construct has to be made again with the right sequence of can.
  • glpX

  • csoS1-4
    • We tried to isolate the right plasmid again.
    • → Sequencing not successful again.

    • can (BBa_K1465205)
      • → We made another sequencing but got these five mutations again at the same positions as before. Maybe we got the wrong accession number, so we will further work with our can construct.

  • Purification of the carboxysome
    • We want to express and purify the carboxysome based on the plasmid pHnCBcsoS1D, which we received from addgene. The procedure is based on methods described by Bonacci et al., 2011 and So et al., 2004.
      • Grow cells containing the pHnCBcsoS1D in TB medium containing antibiotic at 20 °C overnight
      • Dilute the overnight culture 1:50 in TB medium containing antibiotic. A culture volume of 500 ml was used
      • Grow cells until they reach an OD600 of 0.9-1.2
      • Induce protein expression by adding IPTG to a final concentration of 50 µM. Grow cells overnight
      • Harvest cells by centrifugation with 4500 x g for 20 min at 4 °C
      • Resuspend cells in 50 mL TEMB buffer. Use protease inhibitors, for example PMSF
          TEMB buffer:
        • 5 mM Tris-HCl (pH 8.0)
        • 1 mM EDTA
        • 10 mM MgCl2
        • 20 mM NaHCO3
      • Cell lysis via sonification (6 x 1 min with 1 min cooling interval between every cycle). Therefore a Bandelin Sonopuls HD 2070 with a SH70G with a power of 70 W was used. The power was adjust to 70 %
      • Centrifuge the disruptet cell material with 12,000 x g for 30 min at 4 °C to spin down cell debris. The cellular proteins should be in the supernatant.
      • Collect the supernatant and centrifuge with 40,000 x g for 30 min at 4 °C
      • Discard supernatant. Resuspend the resulting pellet in 20 mL of a 33 % (vol/vol) solution of CellLytic B (Sigma) in TEMB
      • Centrifuge again with 40,000 x g for 30 min at 4 °C
      • Discard supernatant. Resuspend pellet in 3 mL TEMB buffer. Clarify by centrifugation with 3,000 x g for 1 min
      • Load the supernatant onto 10 to 50 % (wt/vol) linear sucrose gradient. Sucrose gradients are made by slowly dribbling high % to low % sucrose down the side of the tube. For ultracentrifugation Polyallomer tubes with a volume of 13,2 mL were used. Ultraspin the sample in a Beckman Coulter OptimaTM LE 80 K Ultracentrifuge with a SW41 Ti Swinging Rotor Bucket with 105,000 x g for 30 min
      • After centrifugation, the carboxysome should be seen as a band near the middle of the gradient
      • → The purification was not succesful, as you could not recognize a visible band in the gradient