Difference between revisions of "Part:BBa K5034214"
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===Basic Description===
 
===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 PYYDT plasmid with the BBa-B0031 RBS, which is a weaker one 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 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.In a sentence, this part is activated by a weaker rbs.It can reversibly convert Poly p and Pi. This reversible process favors the generation of Poly P.For the first time, we expressed this element in a strain of Shewanella and conducted codon optimization based on Shewanella.
 
This composite part includes the PPK1 gene which is initially from Citrobacter freundii and we performed codon optimization on, is expressed in the PYYDT plasmid with the BBa-B0031 RBS, which is a weaker one 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 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.In a sentence, this part is activated by a weaker rbs.It can reversibly convert Poly p and Pi. This reversible process favors the generation of Poly P.For the first time, we expressed this element in a strain of Shewanella and conducted codon optimization based on Shewanella.
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Figure 1: Basic function of PPK1
 
Figure 1: Basic function of PPK1
  
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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 T7Te terminator in our experiment.
 
Terminator: Efficient transcription terminator to ensure proper mRNA processing. We use T7Te terminator in our experiment.
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Figure 2: Colony PCR indicating plasmid replication in Shewanell
 
Figure 2: Colony PCR indicating plasmid replication in Shewanell
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Figure 3: Agarose gel electrophoresis indicating the target gene was successfully introduced into Shewanella
 
Figure 3: Agarose gel electrophoresis indicating the target gene was successfully introduced into Shewanella
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Figure 4: SDS-PAGE results showing that the BBa-B0031 one’s protein expression is the minimum, corresponding to the strength of RBS
 
Figure 4: SDS-PAGE results showing that the BBa-B0031 one’s protein expression is the minimum, corresponding to the strength of RBS
  
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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 Shewanella thus developing the best ability to produce electricity and polymerize phosphorus.
 
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 Shewanella thus developing the best ability to produce electricity and polymerize phosphorus.
 
Conducting molybdate assays to determine Pi concentration and half-cell reaction(electrochemistry) to measure the electricity production ability, we found SPK1(with RBS BBa-B0031) has the worst capacity to polymerize phosphorus but a greatest electroproduction capability.
 
Conducting molybdate assays to determine Pi concentration and half-cell reaction(electrochemistry) to measure the electricity production ability, we found SPK1(with RBS BBa-B0031) has the worst capacity to polymerize phosphorus but a greatest electroproduction capability.
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Figure 5: statistical data on electricity production capacity of Shewanella with the introduction of PPK1 with different RBS
 
Figure 5: statistical data on electricity production capacity of Shewanella with the introduction of PPK1 with different RBS
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Figure 6: statistical data on phosphorus accumulation capacity of Shewanella with the introduction of PPK1 with different RBS
 
Figure 6: statistical data on phosphorus accumulation capacity of Shewanella with the introduction of PPK1 with different RBS
  

Revision as of 13:38, 29 September 2024


PolyP <->Pi

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 PYYDT plasmid with the BBa-B0031 RBS, which is a weaker one 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 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.In a sentence, this part is activated by a weaker rbs.It can reversibly convert Poly p and Pi. This reversible process favors the generation of Poly P.For the first time, we expressed this element in a strain of Shewanella and conducted codon optimization based on Shewanella.

Figure 1: Basic function of PPK1

Construct features

Promoter: Constitutive promoter for continuous expression. We use tac promoter in our experiment. RBS: Ribosome binding site for efficient translation. BBa-B0031 here. PPK1 Coding Sequence: Encodes the polyphosphate kinase 1 enzyme. Terminator: Efficient transcription terminator to ensure proper mRNA processing. We use T7Te terminator in our experiment.

Figure 2: Colony PCR indicating plasmid replication in Shewanell
Figure 3: Agarose gel electrophoresis indicating the target gene was successfully introduced into Shewanella
Figure 4: SDS-PAGE results showing that the BBa-B0031 one’s protein expression is the minimum, corresponding to the strength of RBS

Origin (Organism)

The PPK1 gene was sourced from Citrobacter freundii.

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 Shewanella thus developing the best ability to produce electricity and polymerize phosphorus. Conducting molybdate assays to determine Pi concentration and half-cell reaction(electrochemistry) to measure the electricity production ability, we found SPK1(with RBS BBa-B0031) has the worst capacity to polymerize phosphorus but a greatest electroproduction capability.

Figure 5: statistical data on electricity production capacity of Shewanella with the introduction of PPK1 with different RBS
Figure 6: statistical data on phosphorus accumulation capacity of Shewanella with the introduction of PPK1 with different RBS

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. Sequence and Features


Assembly Compatibility:
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    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
    COMPATIBLE WITH RFC[1000]