Team:Heidelberg/Tyrocidine

From 2013.igem.org

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Our strain <i>Brevibacillus Parabrevis</i> arrived from the Marahiel-lab. As preparation for the module shuffling experiments the strain was validated with test primers by colony PCR. The screening was positive, so we designed our Gibson compatible primersfor amplification. </p>
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Our strain <i>Brevibacillus Parabrevis</i> arrived from the Marahiel-lab. As preparation for the module shuffling experiments the strain was validated with test primers by colony PCR. The screening was positive, so we designed our Gibson compatible primers for amplification. </p>
                          
                          
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                                   <h1>Week 13</h1>
                                   <h1>Week 13</h1>
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                                   <p style="font-size:10pt; text-align:justify; position:relative; margin-left:6%;">We started with the amplification of fragments for the module shuffling with Gibson Primers. Most fragments were amplified in the first attempt, however others needed protocol optimization. At the end of the week 12 out of 15 fragments were successfully amplified. The next step to take is to amplify the remaining fragments and start with the Gibson Assembly. </p>
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                                   <p style="font-size:10pt; text-align:justify; position:relative; margin-left:6%;">We started with the amplification of fragments for the module shuffling with Gibson Primers. Most fragments were amplified in the first attempt, however others needed protocol optimization. At the end of the week 12 out of 15 fragments were successfully amplified. The next step to take, is to amplify the remaining fragments and start with the Gibson Assembly. </p>
                                    
                                    
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                                   <h1>Week 14</h1>
                                   <h1>Week 14</h1>
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                                   <p style="font-size:10pt; text-align:justify; position:relative; margin-left:6%;">After DNA concentration measurements, some of the previously amplified fragments had to be reamplified. The PCR protocols were optimized and the missing fragments were successfully obtained. We amplified all fragments with the necessary concentration to start. with the Gibson assembly. However we noticed that we mixed up fragments during the assembly of Tripeptide-I-NRPS (pIK04)and restarted this experiment in the next week. </p>
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                                   <p style="font-size:10pt; text-align:justify; position:relative; margin-left:6%;">After DNA concentration measurements, some of the previously amplified fragments had to be reamplified. The PCR protocols were optimized and the missing fragments were successfully obtained. We amplified all fragments with the necessary concentration to start with the Gibson assembly. However we noticed that we mixed up fragments during the assembly of Tripeptide-I-NRPS (pIK04)and resumed this experiment in the next week. </p>
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                                   <h1>Week 16</h1>
                                   <h1>Week 16</h1>
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                                   <p style="font-size:10pt; text-align:justify; position:relative; margin-left:6%;">Module Shuffling
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                                   <p style="font-size:10pt; text-align:justify; position:relative; margin-left:6%;"><b>Module Shuffling</b>
Sequencing proved the successful assembly of the Tripeptide-I-NRPS (pIK04). All other NRPs had to be reconstructed through a new Gibson Assembly. For this purpose, we optimized the Gibson Assembly master mix, assuming that backbone religations were one of the main reasons for the failed assembly. We calculated a lower backbone-to-insert ratio and added fragment 12 in excess to the Tetrapeptide-I-fragment-mix. The assembled plasmids were transformed into electrocompetent DH10β and plated onto Cm-Lb. Afterwards white colonies were picked and grown overnight in 2x YT medium (Cm). Their mini-preps were analyzed with restriction digest. Two samples of each the Dipeptide (pIK03) and the Tetrapeptide-I (pPW01) plasmids were sent to sequencing. There was no positive restriction digest, neither for the Tetrapeptide-I-NRPS (pPW01) nor for Tetrapeptide-II-NRPS (pPW02). We decided not to reassemble the Tetrapeptide-II-construct (pPW02) and did not continue working on this NRP. Hence only colonies on the Tetrapeptide-I-construct (pPW01) plates were picked.
Sequencing proved the successful assembly of the Tripeptide-I-NRPS (pIK04). All other NRPs had to be reconstructed through a new Gibson Assembly. For this purpose, we optimized the Gibson Assembly master mix, assuming that backbone religations were one of the main reasons for the failed assembly. We calculated a lower backbone-to-insert ratio and added fragment 12 in excess to the Tetrapeptide-I-fragment-mix. The assembled plasmids were transformed into electrocompetent DH10β and plated onto Cm-Lb. Afterwards white colonies were picked and grown overnight in 2x YT medium (Cm). Their mini-preps were analyzed with restriction digest. Two samples of each the Dipeptide (pIK03) and the Tetrapeptide-I (pPW01) plasmids were sent to sequencing. There was no positive restriction digest, neither for the Tetrapeptide-I-NRPS (pPW01) nor for Tetrapeptide-II-NRPS (pPW02). We decided not to reassemble the Tetrapeptide-II-construct (pPW02) and did not continue working on this NRP. Hence only colonies on the Tetrapeptide-I-construct (pPW01) plates were picked.
The positive Dipeptide- (pIK03), Tripeptide-I (pIK04) and Tetrapeptide-I (pPW01) NRPS constructs were chemically transformed into BAP I cells and plated onto Cm-LB. Furthermore colonies were picked and validated through restriction digest. Here only pIK03 (Dipeptide) and pIK04 (Tripeptide-I) were positive. The Tetrapeptide-I-NRPS (pPW01) was chemically transformed a second time into BAP I.
The positive Dipeptide- (pIK03), Tripeptide-I (pIK04) and Tetrapeptide-I (pPW01) NRPS constructs were chemically transformed into BAP I cells and plated onto Cm-LB. Furthermore colonies were picked and validated through restriction digest. Here only pIK03 (Dipeptide) and pIK04 (Tripeptide-I) were positive. The Tetrapeptide-I-NRPS (pPW01) was chemically transformed a second time into BAP I.
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NRPS-Library
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<b>NRPS-Library</b>
For the standardization of the modules from the Tyrocidine cluster used in the shuffling we started amplification with the previously ordered Primers for Modules tycAdCom, tycB1dCom, tycC5, tycC6 introducing the RFC10 prefix and suffix. However, errors in the reverse Primers for tycC5 and tycC6 were noticed and re-ordered. Still the amplification of modules tycAdCom and tycB1dCom was started, but could not be amplified in the necessary concentrations.
For the standardization of the modules from the Tyrocidine cluster used in the shuffling we started amplification with the previously ordered Primers for Modules tycAdCom, tycB1dCom, tycC5, tycC6 introducing the RFC10 prefix and suffix. However, errors in the reverse Primers for tycC5 and tycC6 were noticed and re-ordered. Still the amplification of modules tycAdCom and tycB1dCom was started, but could not be amplified in the necessary concentrations.
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Interspecies Module Shuffling
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<b>Interspecies Module Shuffling</b>
The primers for the interspecies NRPS fusion of different Tyrocidine modules with the Indigoidine synthetase indC were designed and ordered. </p>
The primers for the interspecies NRPS fusion of different Tyrocidine modules with the Indigoidine synthetase indC were designed and ordered. </p>
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Revision as of 16:36, 2 October 2013

Tyrocidine. Proving Modularity of NRPS by Shuffling Modules.

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