Coding
CrCPR

Part:BBa_K4947029

Designed by: Williams Liu   Group: iGEM23_Yale   (2023-10-12)


C. roseus Cytochrome P450 Reductase Codon-Optimized CDS

This part is the gene coding for Cytochrome P450 Reductase from C. roseus. It is codon-optimized and domesticated for SalI, EcoRV, KpnI, PvuII, SphI, MluI, and SpeI restriction sites.

Introduction

This part is the gene coding for Cytochrome P450 Reductase from C. roseus. It is codon-optimized and domesticated for SalI, EcoRV, KpnI, PvuII, SphI, MluI, and SpeI restriction sites. This gene homolog that encodes for CPR was chosen rationally after thorough literature review. CPR is an enzyme involved in the biosynthetic pathway of daidzein, helping convert liquiritigenin into 2,7,4’-trihydroxyisoflavanone with the help of isoflavone synthase. The gene sequence was sourced from NCBI GenBank [1], and produced by Twist Bioscience. The codon optimization and domestication was done to improve recombinant expression in E. coli and enable restriction enzyme-based swapping of promoters and terminators, respectively.

Description

NADPH–cytochrome P450 reductase (CPR) is an NADPH-dependent CYP450 enzyme. It assists IFS/2-HIS to convert flavanones into 6’-deoxychalcones. These products are generally unstable. CPR has an N-terminus hydrophobic region (that has solubility effects) that is used for membrane anchorage. At the membrane, the CPR transfers an electron to the IFS/2-HIS by reducing NADPH while IFS/2-HIS is acting upon the flavanone substrate. This produces 6’-deoxychalcone. The reaction usually performs best under optimal reduction conditions. Like ATR, CPR likely exists naturally in plants in much lower concentrations compared to its enzymatic partner (IFS/2-HIS in this case). [2]

Usage

This gene homolog performed moderately in yeast to produce genistein [3], but in E. coli, it performed the best out of all tested CPRs to produce daidzein [5]. This is why it was selected for, in terms of optimizing the production of daidzein through recombinant expression of its pathway in E. coli . The sequence was codon-optimized using the CAD-SGE algorithm developed by Jaymin Patel in Farren Isaacs’ lab at Yale University [4]. This DNA was synthesized from Twist Bioscience, as an in-kind donation. There were no problems with gene synthesis. Problems encountered during amplification, plasmid construction, and everything else in the cloning process was not due to the gene sequence or source itself. This DNA is of biosafety level 1.

Experience

We amplified these genes using high-fidelity PCR with primers designed to anneal at each end (Figure 1). We then DpnI-digested and purified these amplicons. Subsequently, we performed Golden Gate assembly using NEBridge® Golden Gate Assembly Kit (which was also donated in-kind) and their specified protocol to build plasmids using this part. We electroporated TransforMax EC100D pir+ electrocompetent E. coli with the assembled DNA, and plated on selective media. Then, we ran diagnostic colony PCR that amplified parts of the plasmid to check for the presence of successful junctions, which indicate successful assembly. Of the colonies that had positive results, some were inoculated, plasmid-purified (using QIAGEN mini-prep kit and protocol), and sent for whole plasmid sequencing, a service purchased from Plasmidsaurus. Finally, whole plasmid sequencing results confirmed success or failure. This is the general procedure we recommend for using and characterizing this part, as it was successful for us.

Characterization

amplicons.png

Figure 1. In the lane labeled 109, the amplicon for this part is clear and distinct.

Significance

CPR is a main rate-determining enzyme in the biosynthesis of daidzein. It is important for efficient production of daidzein. Optimizing for a specific flavonoid, daidzein in this case, is a great first step to improving production. This part specifically is important for optimal daidzein production, when being produced recombinantly by E. coli. Take a look at the rest of our wiki (https://2023.igem.wiki/yale/index.html) for how this part connects to human health, economics, and more!

References

1. https://www.ncbi.nlm.nih.gov/protein/Q05001.1

2. View our contributions page (https://2023.igem.wiki/yale/contribution) for a spreadsheet of all our sources!

3. Liu, Q., Liu, Y., Li, G., Savolainen, O., Chen, Y., & Nielsen, J. (2021, October 19). De novo biosynthesis of bioactive isoflavonoids by engineered yeast cell factories. Nature News. https://www.nature.com/articles/s41467-021-26361-1

4. Cross-kingdom expression of synthetic genetic elements promotes discovery of metabolites in the human microbiome. Patel JR, Oh J, Wang S, Crawford JM, Isaacs FJ. Cell. 2022 Apr 28;185(9):1487-1505.e14. doi: 10.1016/j.cell.2022.03.008. Epub 2022 Apr 1. 10.1016/j.cell.2022.03.008 PubMed 35366417

5. Chemler, et al., J. (2010). A Versatile Microbial System for Biosynthesis of Novel Polyphenols with Altered Estrogen Receptor Binding Activity. Cell. https://www.cell.com/cell-chemical-biology/pdf/S1074-5521(10)00121-3.pdf

Sequence and Features


Assembly Compatibility:
  • 10
    INCOMPATIBLE WITH RFC[10]
    Illegal EcoRI site found at 1408
    Illegal PstI site found at 821
    Illegal PstI site found at 1465
    Illegal PstI site found at 1629
  • 12
    INCOMPATIBLE WITH RFC[12]
    Illegal EcoRI site found at 1408
    Illegal PstI site found at 821
    Illegal PstI site found at 1465
    Illegal PstI site found at 1629
  • 21
    INCOMPATIBLE WITH RFC[21]
    Illegal EcoRI site found at 1408
    Illegal BamHI site found at 1299
    Illegal XhoI site found at 6
  • 23
    INCOMPATIBLE WITH RFC[23]
    Illegal EcoRI site found at 1408
    Illegal PstI site found at 821
    Illegal PstI site found at 1465
    Illegal PstI site found at 1629
  • 25
    INCOMPATIBLE WITH RFC[25]
    Illegal EcoRI site found at 1408
    Illegal PstI site found at 821
    Illegal PstI site found at 1465
    Illegal PstI site found at 1629
    Illegal NgoMIV site found at 981
    Illegal NgoMIV site found at 1674
  • 1000
    COMPATIBLE WITH RFC[1000]

Functional Parameters

protein-NA-
[edit]
Categories
//cds
//cds/biosynthesis
//cds/enzyme
//function/biosynthesis
Parameters
protein