Difference between revisions of "Part:BBa K2560002"
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<partinfo>BBa_K2560002 parameters</partinfo>
 
<partinfo>BBa_K2560002 parameters</partinfo>
 
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Here, we present the improvement of an iGEM-part for (a mostly faster,) easier and cheaper selection which suits our needs.</p>
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iGEM provides the universal acceptor plasmid BBa_P10500 for creating new PhytoBricks. This plasmid contained the <i>lacZ-α</i> part in the cloning sites for blue-white screening. As we wanted to establish <i>Vibrio natriegens</i> as a chassis for cloning, we investigated if the wild type strain is compatible with blue-white screening. Unfortunately, cloning using BBa_P10500 in <i>V. natriegens</i> shows no difference between colonies containing the <i>lacZ-α</i> dropout and those without.
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To overcome this limitation and to enable fast and reliable cloning with <i>V. natriegens</i>, we decided to establish a new visualization method. Our improved part is a derivative of the iGEM BBa_P10500 containing a sfGFP dropout as fluorescent selection marker.
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In the pictures 2, you can see the wild type <i>V. natriegens</i> in comparison with the iGEM BBa_P10500 forming white colonies as well as bright green colonies containing the improved part BBa_K2560002. No differences between the wild type and the BBa_P10500 containing colonies are noticable. On the contrary, our new BBa_K2560002 part leads to a strong visual distinction to colonies which do not possess the sfGFP. In this way, we created a part for universal LVL0 cloning with a improved selection without the need of additional supplements like Xgal or IPTG.
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Our part not only suits for <i>V. natriegens</i> but is convenient for the frequently used cloning host <i>E. coli</i>. As it can be seen in the picture 3, <i>E. coli</i> containing the sfGFP possess a considerable strong green colour even without the use of UV light and is just or even more distinguishable from the wild type as the <i>lacZ</i> containing blue colonies. By using our improved part BBa_K2560002 instead of the iGEM part BBa_P10500 work and money for the addition of the required supplements can be saved and the risk of not functional plates for selection is decreased. In our experiments, we were using 40 μg per Liter Xgal and 0,5 mM IPTG. Calculating with current prices, 100 plates supplemented with Xgal andIPTG costs about 80 dollar. </p><p>
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        <img src=" https://static.igem.org/mediawiki/2018/8/80/T--Marburg--V.natriegens.png "/>
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        <figcaption><b> Figure 2: <i>V. natriegens</i> </b><br> A: Colonies of wild type, B:  white colonies containing BBa_P10500 and C: colonies with BBa_K2560002 resulting in green colonies. </figcaption>
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<img src=" https://static.igem.org/mediawiki/2018/b/b3/T--Marburg--E.coli.png "/> <figcaption><b> Figure 3: <i>E. coli</i> </b><br> A: Colonies of wild type, B:  blue colonies containing BBa_P10500 and C: colonies with BBa_K2560002 resulting in green colonies. </figcaption>
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<br>By using our improved part for cloning, the detection of successfully ligated clones from non is feasible for strains which are not compatible with blue-white screening and therefor becomes more universal, faster and cheaper than before. </p>
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===Marburg Toolbox===
 
===Marburg Toolbox===

Revision as of 17:16, 17 October 2018


Phytobrick Entry Vector with GFP dropout

This plasmid can be used to create Phytobricks using a Golden Gate Reaction. A sfGFP dropout helps to distinguish between wrong colonies (green) and correct colonies (white)

Sequence and Features


Assembly Compatibility:
  • 10
    COMPATIBLE WITH RFC[10]
  • 12
    COMPATIBLE WITH RFC[12]
  • 21
    COMPATIBLE WITH RFC[21]
  • 23
    COMPATIBLE WITH RFC[23]
  • 25
    COMPATIBLE WITH RFC[25]
  • 1000
    INCOMPATIBLE WITH RFC[1000]
    Illegal BsaI site found at 1
    Illegal BsaI.rc site found at 1035
    Illegal SapI.rc site found at 193



Here, we present the improvement of an iGEM-part for (a mostly faster,) easier and cheaper selection which suits our needs.

iGEM provides the universal acceptor plasmid BBa_P10500 for creating new PhytoBricks. This plasmid contained the lacZ-α part in the cloning sites for blue-white screening. As we wanted to establish Vibrio natriegens as a chassis for cloning, we investigated if the wild type strain is compatible with blue-white screening. Unfortunately, cloning using BBa_P10500 in V. natriegens shows no difference between colonies containing the lacZ-α dropout and those without.

To overcome this limitation and to enable fast and reliable cloning with V. natriegens, we decided to establish a new visualization method. Our improved part is a derivative of the iGEM BBa_P10500 containing a sfGFP dropout as fluorescent selection marker. In the pictures 2, you can see the wild type V. natriegens in comparison with the iGEM BBa_P10500 forming white colonies as well as bright green colonies containing the improved part BBa_K2560002. No differences between the wild type and the BBa_P10500 containing colonies are noticable. On the contrary, our new BBa_K2560002 part leads to a strong visual distinction to colonies which do not possess the sfGFP. In this way, we created a part for universal LVL0 cloning with a improved selection without the need of additional supplements like Xgal or IPTG.

Our part not only suits for V. natriegens but is convenient for the frequently used cloning host E. coli. As it can be seen in the picture 3, E. coli containing the sfGFP possess a considerable strong green colour even without the use of UV light and is just or even more distinguishable from the wild type as the lacZ containing blue colonies. By using our improved part BBa_K2560002 instead of the iGEM part BBa_P10500 work and money for the addition of the required supplements can be saved and the risk of not functional plates for selection is decreased. In our experiments, we were using 40 μg per Liter Xgal and 0,5 mM IPTG. Calculating with current prices, 100 plates supplemented with Xgal andIPTG costs about 80 dollar.

Figure 2: V. natriegens
A: Colonies of wild type, B: white colonies containing BBa_P10500 and C: colonies with BBa_K2560002 resulting in green colonies.
Figure 3: E. coli
A: Colonies of wild type, B: blue colonies containing BBa_P10500 and C: colonies with BBa_K2560002 resulting in green colonies.


By using our improved part for cloning, the detection of successfully ligated clones from non is feasible for strains which are not compatible with blue-white screening and therefor becomes more universal, faster and cheaper than before.

===Marburg Toolbox===

We proudly present the Marburg Collection, a novel golden-gate-based toolbox containing various parts that are compatible with the PhytoBrick system and MoClo. Compared to other bacterial toolboxes, the Marburg Collection shines with superior flexibility. We overcame the rigid paradigm of plasmid construction - thinking in fixed backbone and insert categories - by achieving complete de novo assembly of plasmids.

36 connectors facilitate flexible cloning of multigene constructs and even allow for the inversion of individual transcription units. Additionally, our connectors function as insulators to avoid undesired crosstalk.

The Marburg Collection contains 123 parts in total, including:
inducible promoters, reporters, fluorescence and epitope tags, oris, resistance cassettes and genome engineering tools. To increase the value of the Marburg Collection, we additionally provide detailed experimental characterization for V. natriegens and a supportive software. We aspire availability of our toolbox for future iGEM teams to empower accelerated progression in their ambitious projects.


Figure 3: Hierarchical cloning is facilitated by subsequent Golden Gate reactions.
Basic building blocks like promoters or terminators are stored in level 0 plasmids. Parts from each category of our collection can be chosen to built level 1 plasmids harboring a single transcription unit. Up to five transcription units can be assembled into a level 2 plasmid.
Figure 4: Additional bases and fusion sites ensure correct spacing and allow tags.
Between some parts, additional base pairs were integrated to ensure correct spacing and to maintain the triplet code. We expanded our toolbox by providing N- and C- terminal tags by creating novel fusions and splitting the CDS and terminator part, respectively.


Parts of the Marburg Toolbox




Tags and Entry Vectors




  • K2560001 (Entry Vector with RFP dropout)
  • K2560002 (Entry Vector with GFP dropout)
  • K2560005 (Resistance Entry Vector with RFP Dropout)
  • K2560006 (Resistance Entry Vector with GFP Dropout)
  • K2560305 (gRNA Entry Vector with GFP Dropout)