Difference between revisions of "Team:DTU-Denmark/Journal"

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         Summary
 
         Summary
 
       </h1>
 
       </h1>
       <p>For MAGE (Multiplex Automated Genome Engineering) to be effective there is two genetic improvements that can be done. The first and most important is that the organism need to express a recombinase protein such as the beta protein derived from the lambda RED E. coli phage. The second improvement is to destroy/inhibit the mismatch repair system [1]. In B. subtilis the genes mutS and mutL are taking care of the mismatch repair [2]. For proof of concept purposes deleting the mismatch repair system will be adequate. According to (REF) the protein encoded by mutL will not be functional without a functional mutS, this is why deletion of only mutS will be sufficient to take out the mismatch repair system. With respect to recombinase we will test two different recombinases: lambda-beta (codon optimized for <em>B. subtilis 168</em>) and gp35 (a recombinase from the B. subtilis phage SPP1) [3]. For duing proof of concept of MAGE in <em>B. subtilis</em> four different strains was producere via genetic recombineering. All derived from <em>Bacillus subtilis 168</em>:</p>
+
       <p>For OGRE (Oligo Recombineering) to be effective there is two genetic improvements that can be done. The first and most important is that the organism need to express a recombinase protein such as the beta protein derived from the lambda RED E. coli phage. The second improvement is to destroy/inhibit the mismatch repair system [1]. In B. subtilis the genes mutS and mutL are taking care of the mismatch repair [2]. For proof of concept purposes deleting the mismatch repair system will be adequate. According to (REF) the protein encoded by mutL will not be functional without a functional mutS, this is why deletion of only mutS will be sufficient to take out the mismatch repair system. With respect to recombinase we will test two different recombinases: lambda-beta (codon optimized for <em>B. subtilis 168</em>) and gp35 (a recombinase from the B. subtilis phage SPP1) [3]. For duing proof of concept of OGRE in <em>B. subtilis</em> four different strains was producere via genetic recombineering. All derived from <em>Bacillus subtilis 168</em>:</p>
  
 
<ul>
 
<ul>
 
<li>∆<em>amyE::beta-neo<sup>R</sup></em></li>
 
<li>∆<em>amyE::beta-neo<sup>R</sup></em></li>
<li>∆<em>amyE::gp35-neo<sup>R</sup></em></li>
+
<li>∆<em>amyE::GP35-neo<sup>R</sup></em></li>
 
<li>∆<em>mutS::beta-neo<sup>R</sup></em></li>
 
<li>∆<em>mutS::beta-neo<sup>R</sup></em></li>
<li>∆<em>mutS::gp35-neo<sup>R</sup></em></li>
+
<li>∆<em>mutS::GP35-neo<sup>R</sup></em></li>
 
</ul>
 
</ul>
 +
 +
<p>The four different strains where compared to each other to get compare there transformation efficienc in MAGE.</p>
  
 
     </div>
 
     </div>
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         Methods
 
         Methods
 
       </h1>
 
       </h1>
       <p><strong>Gel electrophoresis</strong></p>
+
       <p>&nbsp;</p>
  
<p><strong>Genomic DNA extraction (B. brevis)</strong></p>
+
<p><strong>making beta and GP35</strong></p>
  
<p><strong>Gibson Assembly</strong></p>
+
<p>The beta CDS was codon optimized with JCat() and ordered from COMPANY. GP35 sequence was found from (GP35 article). The sequence was ordered from the same company as beta.</p>
  
<p><strong>Glycerol stock &ndash;preservation</strong></p>
+
<p><strong>incertion of recombinases in the amyE locus of B. subtilis</strong></p>
 +
 
 +
<p>Beta and GP35 was inserted into the plasmid known as pDG268neo by using PCR with G5 HF 2x master mix from NEB (primer sequence hyperlink?). The plasmid was transformed into E coli DH5alpha by heat chock and incubated over night. The plasmid was purified from E coli by using QiAPrep mini prep kit. Digesting with restriction enzymes validated the insertion. This plasmid integrates the CDS into the amyE locus in Bacillus subtilis. pDG268neo with ether beta or GP35 was linearized and transformed into B subtilis W168 using the CFrench protocol (make CFrench to hyperlink)</p>
 +
 
 +
<p>chromosomal DNA from B. subtilis 168 was isolated <strong>(protocol)</strong></p>
 +
 
 +
<p><strong>knock out mutS </strong></p>
 +
 
 +
<p>The regions upstream and downstream of the mutS locus were amplified by PCR from the chromosomal DNA with primers that had overlap with GP35 and beta.</p>
 +
 
 +
<p>GP35 and beta were PCR amplified with primers that had overhangs that were homologies to the mutS locus in bacillus subtilis. GP35 and beta was assembled into the pSB1C3 plasmid by using gibson assembly and transformed into E coli and incubated over night. The plasmid was isolated by using mini prep.&nbsp; The plasmids were verified using restriction enzymes.</p>
 +
 
 +
<p>beta and GP35 in pSB1C3 was linearized using XhoI, This also removed the Chloramphenicol gene from the plasmid. Beta and GP35 was transformed into B. subtilis.</p>
 +
 
 +
<p>&nbsp;
 +
<p><strong>Genomic DNA extraction (B. brevis)</strong></p>
 +
</p>
  
 +
<p>&nbsp;
 
<p><strong>Ligation of DNA</strong></p>
 
<p><strong>Ligation of DNA</strong></p>
 +
</p>
  
 
<p><strong>PCR</strong> -</p>
 
<p><strong>PCR</strong> -</p>
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<p><strong>Restriction enzyme digest (NEB)</strong></p>
 
<p><strong>Restriction enzyme digest (NEB)</strong></p>
 +
 +
<p><strong>Tyrocidine construct</strong></p>
  
 
<p><strong>Transformation and Preparation of E.coli</strong><br />
 
<p><strong>Transformation and Preparation of E.coli</strong><br />
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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; -Transformation of Chemically Competent E.coli<br />
 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; -Transformation of Chemically Competent E.coli<br />
 
<strong>Transformation of Bacillus</strong></p>
 
<strong>Transformation of Bacillus</strong></p>
 +
 +
<p><strong>Optiminsing OGRE in Bacillus</strong></p>
 +
 +
<p style="margin-left:30.0pt;">Different amount of oligo was tested to optimize OGRE method for Bacillus subtilis.</p>
 +
 +
<p style="margin-left:30.0pt;">The mismatch insertion frequency and oligo length was tested. The standard OGRE protocol was follow with the mismatches verified from 1-6 mismatches and oligoes from 50-100nt.</p>
 +
 +
<p style="margin-left:30.0pt;">OGRE with 4 cycles were attempted every cycle to approximately 6 hours. This was done to test if the transformation efficiency would rise when more cycles were attempted</p>
 +
 +
<p>&nbsp;</p>
 +
 +
<p><strong>changing surfatin</strong></p>
 +
 +
<p>The 5th A domain in the NRPS for surfactin was attempted changed from a aspartate to a asparagine. This was done by following the OGRE protocol using a oligo that would change the specificity from asp to asn.</p>
 +
 +
<p>&nbsp;</p>
  
 
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     </div>
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     <ul class="timeline">
 
     <ul class="timeline">
 +
   
 +
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 +
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 +
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 +
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 +
            <h4 class="timeline-title">Biology of the Future </h4>
 +
            <p><small class="text-muted"><i class="glyphicon glyphicon-time"></i> 2015-09-14</small></p>
 +
          </div>
 +
          <div class="timeline-body">
 +
            <p style="text-align: justify;"><img alt="" src="None" style="height: 158px; width: 250px; float: left;" />Our team member Pernille spent an afternoon giving a presentation on cell factories and synthetic biology to 30 highschool students. She says: &quot;Synthetic biology is all about being creative and use your imagination&nbsp;to design bio-solutions that can impact the world. For that exact reason, it is neccesary to discuss which ethical values tat should drive research&quot;. The highschool students had lots of questions and opinion for the discussion about ethics.</p>
 +
 +
<p style="text-align: justify;">&nbsp;</p>
 +
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 +
            <h4 class="timeline-title">VWR to the rescue! </h4>
 +
            <p><small class="text-muted"><i class="glyphicon glyphicon-time"></i> 2015-09-01</small></p>
 +
          </div>
 +
          <div class="timeline-body">
 +
            <p>We are happy to announce that the VWR&nbsp;is contributing our team with&nbsp;their awesome products!</p>
 +
 +
<p><img alt="" src="None" style="width: 400px; height: 533px;" /></p>
 +
 +
<p>&nbsp;</p>
 +
 +
          </div>
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Revision as of 14:21, 16 September 2015

Scroll down for more

Summary

For OGRE (Oligo Recombineering) to be effective there is two genetic improvements that can be done. The first and most important is that the organism need to express a recombinase protein such as the beta protein derived from the lambda RED E. coli phage. The second improvement is to destroy/inhibit the mismatch repair system [1]. In B. subtilis the genes mutS and mutL are taking care of the mismatch repair [2]. For proof of concept purposes deleting the mismatch repair system will be adequate. According to (REF) the protein encoded by mutL will not be functional without a functional mutS, this is why deletion of only mutS will be sufficient to take out the mismatch repair system. With respect to recombinase we will test two different recombinases: lambda-beta (codon optimized for B. subtilis 168) and gp35 (a recombinase from the B. subtilis phage SPP1) [3]. For duing proof of concept of OGRE in B. subtilis four different strains was producere via genetic recombineering. All derived from Bacillus subtilis 168:

  • amyE::beta-neoR
  • amyE::GP35-neoR
  • mutS::beta-neoR
  • mutS::GP35-neoR

The four different strains where compared to each other to get compare there transformation efficienc in MAGE.

Methods

 

making beta and GP35

The beta CDS was codon optimized with JCat() and ordered from COMPANY. GP35 sequence was found from (GP35 article). The sequence was ordered from the same company as beta.

incertion of recombinases in the amyE locus of B. subtilis

Beta and GP35 was inserted into the plasmid known as pDG268neo by using PCR with G5 HF 2x master mix from NEB (primer sequence hyperlink?). The plasmid was transformed into E coli DH5alpha by heat chock and incubated over night. The plasmid was purified from E coli by using QiAPrep mini prep kit. Digesting with restriction enzymes validated the insertion. This plasmid integrates the CDS into the amyE locus in Bacillus subtilis. pDG268neo with ether beta or GP35 was linearized and transformed into B subtilis W168 using the CFrench protocol (make CFrench to hyperlink)

chromosomal DNA from B. subtilis 168 was isolated (protocol)

knock out mutS

The regions upstream and downstream of the mutS locus were amplified by PCR from the chromosomal DNA with primers that had overlap with GP35 and beta.

GP35 and beta were PCR amplified with primers that had overhangs that were homologies to the mutS locus in bacillus subtilis. GP35 and beta was assembled into the pSB1C3 plasmid by using gibson assembly and transformed into E coli and incubated over night. The plasmid was isolated by using mini prep.  The plasmids were verified using restriction enzymes.

beta and GP35 in pSB1C3 was linearized using XhoI, This also removed the Chloramphenicol gene from the plasmid. Beta and GP35 was transformed into B. subtilis.

 

Genomic DNA extraction (B. brevis)

 

Ligation of DNA

PCR -

  • PCR
  • Colony PCR
  • Touch down

Plasmid Purification Miniprep

 

Restriction enzyme digest (NEB)

Tyrocidine construct

Transformation and Preparation of E.coli
            -Preparation of Competent Cells
            -Transformation of Chemically Competent E.coli
Transformation of Bacillus

Optiminsing OGRE in Bacillus

Different amount of oligo was tested to optimize OGRE method for Bacillus subtilis.

The mismatch insertion frequency and oligo length was tested. The standard OGRE protocol was follow with the mismatches verified from 1-6 mismatches and oligoes from 50-100nt.

OGRE with 4 cycles were attempted every cycle to approximately 6 hours. This was done to test if the transformation efficiency would rise when more cycles were attempted

 

changing surfatin

The 5th A domain in the NRPS for surfactin was attempted changed from a aspartate to a asparagine. This was done by following the OGRE protocol using a oligo that would change the specificity from asp to asn.

 

Timeline

  • Biology of the Future

    2015-09-14

    Our team member Pernille spent an afternoon giving a presentation on cell factories and synthetic biology to 30 highschool students. She says: "Synthetic biology is all about being creative and use your imagination to design bio-solutions that can impact the world. For that exact reason, it is neccesary to discuss which ethical values tat should drive research". The highschool students had lots of questions and opinion for the discussion about ethics.

     

  • VWR to the rescue!

    2015-09-01

    We are happy to announce that the VWR is contributing our team with their awesome products!

     

  • Visit from Fisher Scientific!

    2015-08-26

    Today we had a visit by Susanne Basse from Fisher Scientific. She came by our office with a wagon full of items, Thanks! 

  • Contribution from Macrogen!

    2015-08-20

    We are pleased to announce that Macrogen is sponsoring our team with sequencing!

  • Contributions from AKG!

    2015-08-19

    We are happy to announce that AKG Acoustics is sponsoring our team with headphones for presentations in Boston! 

  • Contributions from VWR - Bie & Berntsen A/S

    2015-08-11

    We are happy to announce that VWR - Bie & Berntsen A/S is sponsoring our team with lab consumeables!

  • Contributions from Fisher Scientific

    2015-08-11

    We are happy to announce that Fisher Scientific is sponsoring our team with lab materials! 

  • Canoeing

    2015-08-07

    Today we took a day off from lab to go canoeing, followed by a barbeque at Chris' place.

  • Contribution from SnapGene

    2015-08-03

    We are happy to announce that the SnapGene is contributing our team with lisences to their awesome product!

  • Wiki Wizard

    2015-07-30

    We have uploaded the first beta version of the Wiki Wizard to GitHub

  • First BioBrick cloned into B. subtilis

    2015-07-30

    An expression cassette with lambda beta recombinase was sucesfully transformed into Bacillus subtilis. First step towards establishing MAGE in Bacillus subtilis completed!

  • BioBrick High School Project

    2015-07-23

    3 high school students; Simran, Noor, and Charlotte, joined us and Biotech Academy for 5 days to make biosensors that changes color, when water is poluted. Read more at ADD and http://biotechacademy.dk.

  • First sequencing results

    2015-07-22

    We received our first sequencing results. One step closer to our first BioBrick!

  • Brevibacillus parabrevis arrives

    2015-07-16

    Brevibacillus parabrevis produces a lot of different antibiotics including tyrocidine. We will transfer the tyrocidine operon to our chassis Bacillus subtilis.

  • Contribution from the Lundbeck Foundation!

    2015-07-15

    We are happy to announce that the Lundbeck Foundation is contributing financially to our team!

  • Contributions from In Vitro!

    2015-05-06

    We are happy to announce that In Vitro A/S is sponsoring our team with lab consumeables! 

  • Contributions from Frisnette

    2015-04-30

    We are happy to announce that Frisnette is sponsoring our team with lab consumeables! 

  • We get our strain

    2015-04-28

    We get a plate of our chassis strain Bacillus subtilis W168.
    We can now begin the work in the laboratory.

  • BioBrick Workshop

    2015-04-24

    Southern University of Denmark and University of Copenhagen joined us for a three-day BioBrick tutorial, where we spent three days in the laboratory cloning, learning about iGEM, wiki design, and getting to know each other through social activities.

  • Contribution from the Otto Mønsted Fonden!

    2015-03-08

    We are happy to announce that the Otto Mønsted Fonden is contributing financially to our team!

  • First official team meeting

    2015-01-14

    Today we had our first official team meeting. We talked about the project and got to know each other.

  • Introductory meeting

    2014-11-25

    This day, last years team held an introductory session about iGEM for interested people.

Technical University of Denmark
Department of Systems Biology
Søltofts Plads 221
2800 Kgs. Lyngby
Denmark
P: +45 45 25 25 25
M: dtu-igem-2015@googlegroups.com