Difference between revisions of "Part:BBa K5034222"
(→‎References)
 
(One intermediate revision by the same user not shown)
Line 10: Line 10:
 
     <div style="text-align: center;">
 
     <div style="text-align: center;">
 
         <img src="https://static.igem.wiki/teams/5034/engineering/mechanism-of-ppk1.png" style="width: 500px; height: auto;">
 
         <img src="https://static.igem.wiki/teams/5034/engineering/mechanism-of-ppk1.png" style="width: 500px; height: auto;">
 +
<p>Figure 1: Basic function of PPK1</p>
 
     </div>
 
     </div>
 
</body>
 
</body>
 
</html>
 
</html>
−
Figure 1: Basic function of PPK1
 
  
 
===Construct features===
 
===Construct features===
Line 20: Line 20:
  
  
−
Plasmid Backbone: pBBR1MCS-terminator plasmid
+
* Plasmid Backbone: pBBR1MCS-terminator plasmid
  
−
Promoter: Constitutive promoter for continuous expression. We use Lac promoter in our experiment.
+
* Promoter: Constitutive promoter for continuous expression. We use Lac promoter in our experiment.
  
−
RBS: Ribosome binding site for efficient translation. We use BBa-B0034 here.
+
* RBS: Ribosome binding site for efficient translation. We use BBa-B0034 here.
  
−
PPK1 Coding Sequence: Encodes the polyphosphate kinase 1 enzyme.
+
* PPK1 Coding Sequence: Encodes the polyphosphate kinase 1 enzyme.
  
−
Terminator: Efficient transcription terminator to ensure proper mRNA processing. We use rrnB T1 terminator and T7Te terminator in our experiment.
+
* Terminator: Efficient transcription terminator to ensure proper mRNA processing. We use rrnB T1 terminator and T7Te terminator in our experiment.
  
 
<html>
 
<html>
Line 34: Line 34:
 
     <div style="text-align: center;">
 
     <div style="text-align: center;">
 
         <img src="https://static.igem.wiki/teams/5034/results/new/basic-structure-of-spk1.png" style="width: 500px; height: auto;">
 
         <img src="https://static.igem.wiki/teams/5034/results/new/basic-structure-of-spk1.png" style="width: 500px; height: auto;">
 +
<p>Figure 2: Basic construction of <i>PPK1</i> with BBa-B0034 RBS plasmid</p>
 
     </div>
 
     </div>
 
</body>
 
</body>
 
</html>
 
</html>
−
Figure 2: Basic construction of <i>PPK1</i> with BBa-B0034 RBS plasmid
 
 
<html>
 
<html>
 
<body>
 
<body>
 
     <div style="text-align: center;">
 
     <div style="text-align: center;">
 
         <img src="https://static.igem.wiki/teams/5034/engineering/pbbr1mcs-terminator-34-ppk1.png" style="width: 500px; height: auto;">
 
         <img src="https://static.igem.wiki/teams/5034/engineering/pbbr1mcs-terminator-34-ppk1.png" style="width: 500px; height: auto;">
 +
<p>Figure 3: Construction of <i>PPK1</i> with BBa-B0034 RBS plasmid</p>
 
     </div>
 
     </div>
 
</body>
 
</body>
 
</html>
 
</html>
−
Figure 3: Construction of <i>PPK1</i> with BBa-B0034 RBS plasmid
 
  
  
Line 53: Line 53:
 
     <div style="text-align: center;">
 
     <div style="text-align: center;">
 
         <img src="https://static.igem.wiki/teams/5034/engineering/fig9.png" style="width: 500px; height: auto;">
 
         <img src="https://static.igem.wiki/teams/5034/engineering/fig9.png" style="width: 500px; height: auto;">
 +
<p>Figure 4: Colony PCR indicating plasmid replication in <i>S. oneidensis.</i></p>
 
     </div>
 
     </div>
 
</body>
 
</body>
 
</html>
 
</html>
−
Figure 4: Colony PCR indicating plasmid replication in <i>S. oneidensis.</i>
 
  
  
Line 64: Line 64:
 
     <div style="text-align: center;">
 
     <div style="text-align: center;">
 
         <img src="https://static.igem.wiki/teams/5034/engineering/gel-ppk1.png" style="width: 500px; height: auto;">
 
         <img src="https://static.igem.wiki/teams/5034/engineering/gel-ppk1.png" style="width: 500px; height: auto;">
 +
<p>Figure 5: Agarose gel electrophoresis indicating we got the target gene with the corresponding RBS</p>
 
     </div>
 
     </div>
 
</body>
 
</body>
 
</html>
 
</html>
−
Figure 5: Agarose gel electrophoresis indicating we got the target gene with the corresponding RBS
 
  
  
Line 75: Line 75:
 
     <div style="text-align: center;">
 
     <div style="text-align: center;">
 
         <img src="https://static.igem.wiki/teams/5034/engineering/fig10.png" style="width: 500px; height: auto;">
 
         <img src="https://static.igem.wiki/teams/5034/engineering/fig10.png" style="width: 500px; height: auto;">
 +
<p>Figure 6: SDS-PAGE results showing that the BBa-B0034 one’s protein expression is the maximum, corresponding to the strength of RBS</p>
 
     </div>
 
     </div>
 
</body>
 
</body>
 
</html>
 
</html>
−
Figure 6: SDS-PAGE results showing that the BBa-B0034 one’s protein expression is the maximum, corresponding to the strength of RBS
 
  
 
===Origin (Organism)===
 
===Origin (Organism)===
Line 91: Line 91:
 
     <div style="text-align: center;">
 
     <div style="text-align: center;">
 
         <img src="https://static.igem.wiki/teams/5034/engineering/fig12.png" style="width: 500px; height: auto;">
 
         <img src="https://static.igem.wiki/teams/5034/engineering/fig12.png" style="width: 500px; height: auto;">
 +
<p>Figure 7: Electricity production capacity of <i>S. oneidensis.</i> after the introduction of PPK1 with different RBS</p>
 
     </div>
 
     </div>
 
</body>
 
</body>
 
</html>
 
</html>
−
Figure 7: Electricity production capacity of <i>S. oneidensis.</i> after the introduction of PPK1 with different RBS
 
 
<html>
 
<html>
 
<body>
 
<body>
 
     <div style="text-align: center;">
 
     <div style="text-align: center;">
 
         <img src="https://static.igem.wiki/teams/5034/engineering/fig11.png" style="width: 500px; height: auto;">
 
         <img src="https://static.igem.wiki/teams/5034/engineering/fig11.png" style="width: 500px; height: auto;">
 +
<p>Figure 8: Phosphorus accumulation capacity of <i>S. oneidensis.</i> after the introduction of PPK1 with different RBS</p>
 +
    </div>
 +
</body>
 +
</html>
 +
 +
We then analyzed factors contributing to the reduced electricity generation capability of SPK1.
 +
 +
Scanning electron microscope and transmission electron microscope results showed that the strains with high phosphorus content had abnormal morphology, indicating that allowing bacteria to be in a high phosphorus content state in advance is not conducive to the rapid transfer of electrons and is not conducive to the ability to produce electricity.
 +
<html>
 +
<body>
 +
    <div style="text-align: center;">
 +
        <img src="https://static.igem.wiki/teams/5034/engineering/fig6.png" style="width: 500px; height: auto;">
 +
<p>Figure 9: Scanning electron microscope of the <i>S. oneidensis.</i> morphology of WT and modified <i>S. oneidensis.</i> strains with BBa-B0034 RBS(strong RBS)</p>
 +
    </div>
 +
</body>
 +
</html>
 +
 +
<html>
 +
<body>
 +
    <div style="text-align: center;">
 +
        <img src="https://static.igem.wiki/teams/5034/engineering/fig7.png" style="width: 500px; height: auto;">
 +
<p>Figure 10: Transmission electron microscopy of the <i>S. oneidensis.</i> morphology of WT and modified <i>S. oneidensis.</i> strains with BBa-B0034 RBS</p>
 
     </div>
 
     </div>
 
</body>
 
</body>
 
</html>
 
</html>
−
Figure 8: Phosphorus accumulation capacity of <i>S. oneidensis.</i> after the introduction of PPK1 with different RBS
 
  
  
Line 120: Line 141:
  
 
===References===
 
===References===
−
1.Itoh, H., & Shiba, T. (2004). Polyphosphate synthetic activity of polyphosphate:AMP phosphotransferase in Acinetobacter johnsonii 210A. Journal of Bacteriology, 186(15), 5178-5181.
+
<i>Wang X , Wang X , Hui K , et al. Highly Effective Polyphosphate Synthesis, Phosphate Removal and Concentration Using Engineered Environmental Bacteria Based on a Simple Solo Medium-copy Plasmid Strategy[J]. Environmental Science & Technology, 2017:acs.est.7b04532.</i>

Latest revision as of 08:21, 2 October 2024


Pi <-> Poly P

Basic Description

This composite part includes the PPK1 gene which is initially from Citrobacter freundii and we performed codon optimization on, is expressed in the pBBR1MCS-terminator plasmid with the BBa-B0032 RBS, which is a medium RBS compared to others. This composite part is designed to facilitate the reversible conversion between inorganic polyphosphate (PolyP) and inorganic phosphate (Pi). The PPK1 enzyme is known for its ability to synthesize PolyP from ATP and Pi and to degrade PolyP back to Pi, with a preference for the synthetic reaction, making it a versatile tool for managing phosphate metabolism in engineered systems.

Figure 1: Basic function of PPK1

Construct features


Assembly Compatibility:
  • 10
    INCOMPATIBLE WITH RFC[10]
    Illegal prefix found in sequence at 4981
    Illegal suffix found in sequence at 1
  • 12
    INCOMPATIBLE WITH RFC[12]
    Illegal EcoRI site found at 4981
    Illegal SpeI site found at 2
    Illegal PstI site found at 16
    Illegal NotI site found at 9
    Illegal NotI site found at 2834
    Illegal NotI site found at 4987
  • 21
    INCOMPATIBLE WITH RFC[21]
    Illegal EcoRI site found at 4981
    Illegal BglII site found at 3580
  • 23
    INCOMPATIBLE WITH RFC[23]
    Illegal prefix found in sequence at 4981
    Illegal suffix found in sequence at 2
  • 25
    INCOMPATIBLE WITH RFC[25]
    Illegal prefix found in sequence at 4981
    Illegal XbaI site found at 4996
    Illegal SpeI site found at 2
    Illegal PstI site found at 16
    Illegal NgoMIV site found at 562
    Illegal NgoMIV site found at 4244
    Illegal NgoMIV site found at 4527
    Illegal AgeI site found at 402
  • 1000
    COMPATIBLE WITH RFC[1000]


  • Plasmid Backbone: pBBR1MCS-terminator plasmid
  • Promoter: Constitutive promoter for continuous expression. We use Lac promoter in our experiment.
  • RBS: Ribosome binding site for efficient translation. We use BBa-B0034 here.
  • PPK1 Coding Sequence: Encodes the polyphosphate kinase 1 enzyme.
  • Terminator: Efficient transcription terminator to ensure proper mRNA processing. We use rrnB T1 terminator and T7Te terminator in our experiment.

Figure 2: Basic construction of PPK1 with BBa-B0034 RBS plasmid

Figure 3: Construction of PPK1 with BBa-B0034 RBS plasmid


We transformed the plasmids into wild-type S. oneidensis., expressed it, and performed colony PCR. The results showed that PPK1 was successfully introduced into S. oneidensis. for replication.

Figure 4: Colony PCR indicating plasmid replication in S. oneidensis.


DNA agarose gel electrophoresis results showed that we obtained the plasmid with BBa-B0034 RBS, which is approximately 2.1 kb in size.

Figure 5: Agarose gel electrophoresis indicating we got the target gene with the corresponding RBS


We performed protein extraction for SDS-PAGE. SDS-PAGE results showed that protein expression of the plasmid with BBa-B0034 RBS is the maximum, corresponding to the strength of RBS.

Figure 6: SDS-PAGE results showing that the BBa-B0034 one’s protein expression is the maximum, corresponding to the strength of RBS

Origin (Organism)

The PPK1 gene was sourced from Citrobacter freundii. The pBBR1MCS-terminator plasmid backbone is a standard vector used for gene expression in synthetic biology applications.

Experimental Characterization and results

Alteration of protein expression intensity can regulate the metabolic networks, so we focused on RBS with varying translation strengths to facilitate the regulation of PPK1 concentration in S. oneidensis. to develop the best ability to produce electricity and polymerize phosphorus.

We conducted Pi content detection to determine Pi concentration and half-cell experiment to measure the electricity production ability, we found SPK1 with RBS BBa-B0034 has the greatest capacity to polymerize phosphorus but a worst electroproduction capability.

Figure 7: Electricity production capacity of S. oneidensis. after the introduction of PPK1 with different RBS

Figure 8: Phosphorus accumulation capacity of S. oneidensis. after the introduction of PPK1 with different RBS

We then analyzed factors contributing to the reduced electricity generation capability of SPK1.

Scanning electron microscope and transmission electron microscope results showed that the strains with high phosphorus content had abnormal morphology, indicating that allowing bacteria to be in a high phosphorus content state in advance is not conducive to the rapid transfer of electrons and is not conducive to the ability to produce electricity.

Figure 9: Scanning electron microscope of the S. oneidensis. morphology of WT and modified S. oneidensis. strains with BBa-B0034 RBS(strong RBS)

Figure 10: Transmission electron microscopy of the S. oneidensis. morphology of WT and modified S. oneidensis. strains with BBa-B0034 RBS


Details of all experiments can be found in the Experiments section on the Wiki.

Chassis and genetic

Chassis：Shewanella onediensis MR-1

The gene can be expressed and function properly in S. oneidensis..

Potential applications

The PPK1 gene (polyphosphate kinase 1) has potential applications in:

Industrial Microbial Engineering: Enhances the production of biofuels, amino acids, or antibiotics by boosting polyphosphate synthesis in microorganisms.

Environmental Bioremediation: Assists in the accumulation of heavy metals or radioactive substances for pollution control.

References

Wang X , Wang X , Hui K , et al. Highly Effective Polyphosphate Synthesis, Phosphate Removal and Concentration Using Engineered Environmental Bacteria Based on a Simple Solo Medium-copy Plasmid Strategy[J]. Environmental Science & Technology, 2017:acs.est.7b04532.