Coding

Part:BBa_K4759058

Designed by: Junyuan Shi   Group: iGEM23_Jiangnan-China   (2023-10-02)


petH-RBS2-petF(D58Y)

Site-directed mutagenesis is a PCR-based method to mutate specified nucleotides of a sequence within a plasmid vector. This technique allows one to study the relative importance of a particular amino acid for protein structure and function.

Usage and Biology

The P450 enzymes are redox-dependent proteins, through which they source electrons from reducing cofactors to drive their activities. This part is coding for ferredoxin reductase PetH and ferredoxin PetF from the algae (Synechocystis PCC 6803) as the redox chaperones of OleP.
After obtaining the best redox partners PetH/PetF, we performed alanine scanning on petF to speculate which sites had a greater impact on its electron transport capacity. Finally, we found that after mutations in seven of them, the electron transport effect would change greatly, so we mutated the amino acids of these sites into other 19 amino acids by modeling, and selected 23 of them to get better results.

p-1.png

Fig1: Fluorescence intensity of wild type with 23 mutants

We conducted control tests with the positive control group, negative control group, and wild-type strains, and finally selected 9 mutants with the highest fluorescence intensity for subsequent catalytic verification by detecting their green fluorescence intensity.

4-7.png

Fig2: Fermentation of 23 mutants and control groups

We conducted control tests with the positive control group, negative control group, and wild-type strains, and finally selected 9 mutants with the highest fluorescence intensity for subsequent catalytic verification by detecting their green fluorescence intensity.

By verifying the catalytic ability, we found that the substrate conversion of D68P was higher than that of the wild type in the nine strains with high fluorescence intensity, reaching 89.2%.

p2.png

Fig3: Conversion of the 9 mutants with the highest fluorescence intensity with wild type


Sequence and Features


Assembly Compatibility:
  • 10
    INCOMPATIBLE WITH RFC[10]
    Illegal EcoRI site found at 1249
  • 12
    INCOMPATIBLE WITH RFC[12]
    Illegal EcoRI site found at 1249
    Illegal NotI site found at 1022
  • 21
    INCOMPATIBLE WITH RFC[21]
    Illegal EcoRI site found at 1249
    Illegal BglII site found at 1560
    Illegal BamHI site found at 1243
  • 23
    INCOMPATIBLE WITH RFC[23]
    Illegal EcoRI site found at 1249
  • 25
    INCOMPATIBLE WITH RFC[25]
    Illegal EcoRI site found at 1249
  • 1000
    COMPATIBLE WITH RFC[1000]


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