Difference between revisions of "Part:BBa K5184055"
Line 17: Line 17:
  
 
===Characterization===
 
===Characterization===
−
After successfully producing 7epiZ, we aim to produce 9HZ and 9H10epoZ, two terpenes that are even more efficient than 7epiZ. [figure 1A].[1] To enable our product to achieve enhanced repellent effects, we explored further on the basis of cycle 2-1 and introduced the oxidase ShZPO and the reductases AtCPR1 and SlCPR2 as its redox partners [figure 4B]. The oxidase and reductase were originally found in eukaryotic organisms, immobilized on the endoplasmic reticulum (ER) in eukaryotic plant cells [figure 1C].
+
To increase the expression level and functionality of oxidase and reductases in <i>E. coli</i>, we introduced the spytag-spycatcher system in addition to truncating the N-terminal anchor regions [figure 9A]. Through the formation of an isopeptide bond between the tag and the catcher, introduction of this system links the oxidase and reductases together, thus facilitating efficient electron transfer.
 +
To test whether the enzymes can be expressed successfully in <i>E. coli</i>, we constructed the plasmids, plasmid pW1-ZIS-NPPS-Mvan4662-st t25ShZPO-sc t76SlCPR2, aiming to test whether the enzymes can maintain their functions after expression and whether the SpyTag can be linked to the SpyCatcher [figure 9B]. Also, we incorporated the plasmids pET28a-sc t25ShZPO, pET28a-st t76SlCPR2 and pET28a-sc t55AtCPR1 to test whether the enzymes can be successfully expressed in <i>E. coli</i>.[figure 1C]
  
−
<center><html><img src="https://static.igem.wiki/teams/5184/parts/scie84.webp" width="600"/></html></center>
+
<center><html><img src="https://static.igem.wiki/teams/5184/parts/scie88.webp" width="600"/></html></center>
−
<center><b>Figure 1: A. Compared to 7epiZ, 9H10epoZ shows better repellency and fecundity-reducing effects against spider mites B. Metabolic pathway for 9-hydroxy-10,11-epoxy-zingiberene, a zingiberene polyoxidase, ShZPO catalyzes the two sequential oxidation of 7-epi-zingiberene C. In plant ER, cytochrome P450 reductases (SlCPR2) and cytochrome P450 oxidases (ShZPO) cluster together; the reductase oxidizes NADPH and transfers the high energy electrons to its corresponding oxidase for the oxidase’s catalysis</b></center>
+
<center><b>Figure 1: A. Attachment of SpyTag and SpyCatcher to two cytochrome P450 enzymes; the formation of isopeptide bond between lysine on SpyCatcher and aspartic acid on SpyTag can link the two enzymes together, this proximity allows electron transfer and thus catalysis of the CYP (t25ShZPO) enzyme to occur B. Plasmid construct of pW1-p-ZIS-Mvan4662-NPPS-T-P-SpyTag-t25ShZPO-SpyCatcher-t76SlCPR2-t C. Plasmid constructs of pET28a-SpyTag-t76SlCPR2, pET28a-SpyCatcher-t25ShZPO, and pET28a-SpyCatcher-t55AtCPR1 </b></center>
  
−
We aim to synthesize 9HZ and 9H10epoZ in <i>E.coli</i>, a prokaryotic organism without an ER. Thus, we optimize the oxidase and reductases for production in E.coli through cutting the N-terminal anchor regions of the three enzymes. Specifically, 25 amino acids at the N-terminal of ShZPO, 76 of SlCPR2 and 55 of AtCPR1 were cut according to the tag analysis results [figure 2].
+
We employed GoldenGate Assembly to build the plasmids pW1-ZIS-NPPS-Mvan4662-st t25ShZPO-sc t76SlCPR2, pET28a-sc t25ShZPO, pET28a-st t76SlCPR2, pET28a-sc t55AtCPR1[figure 2A&B] and then transformed the built plasmids into the <i>E. coli</i> strain DH5α. The colony PCR results and sequencing results show that the plasmids are successfully constructed with no mutations.[figure2C&D]  
  
−
<center><html><img src="https://static.igem.wiki/teams/5184/parts/scie85.webp" width="600"/></html></center>
+
<center><html><img src="https://static.igem.wiki/teams/5184/parts/scie89.webp" width="600"/></html></center>
−
<center><b>Figure 1: A. Protein transit signal peptide prediction using DeepLoc 2.1 for AtCPR1, ShZPO, and SlCPR2. Only results for the first 100 amino acids are shown, a higher Y-value of a letter denotes a higher chance of the amino acid being part of the signal peptide B. Structural prediction results of AtCPR1, ShZPO, and SlCPR2 using AlphaFold Server, the first 55, 25, and 76 amino acids are colored in gray while rest of the enzymes in blue</b></center>
+
<center><b>Figure 2: A. Colony PCR results of pET28a-sc t55AtCPR1, pET28a-st t76SlCPR2, and pET28a-sc t25ShZPO B. Alignment of the sequencing results in Fig10A against designed plasmids C. Colony PCR results of pW1-ZIS-Mvan4662-NPPS-st t25ShZPO-sc t76SlCPR2; the insert region is amplified using two sets of primers and their products designated SCIE22E and SCIE22F D. Alignment of the sequencing results of colony PCR products against designed plasmids</b></center>
  
−
We employed GoldenGate Assembly to construct the plasmids pW1-ZIS-NPPS-Mvan4662-t25ShZPO-t76SlCPR2 and pW1-ZIS-NPPS-Mvan4662-t25ShZPO-t55AtCPR1. The colony PCR results reveal successful plasmid construction. The sequencing result confirms that the fragments are successfully linked with no mutations. [figure 3A&B]
+
Fermentation of pW1-ZIS-NPPS-Mvan4662-st t25ShZPO-sc t76SlCPR2 in DH5α was induced by IPTG and lasted 48 hours using dodecane as solvent. After the products were collected and underwent GC-MS analysis, we discovered that still, 9HZ and 9H10epoZ were not detected. Instead, only 7epiZ was produced.[figure 3A&B]
 +
Plasmids pET28a-sc t25ShZPO, pET28a-st t76SlCPR2, pET28a-sc t55AtCPR1 were transformed into E.coli strand BL21(DE3), fermented and induced by IPTG. The SDS-PAGE result shows that only reductases linked with the SpyTag or SpyCatcher could be expressed successfully, and the oxidase was expressed in inclusion bodies.[figure 4]
  
−
<center><html><img src="https://static.igem.wiki/teams/5184/parts/scie86.webp" width="600"/></html></center>
+
<center><html><img src="https://static.igem.wiki/teams/5184/parts/scie811.webp" width="600"/></html></center>
−
<center><b>Figure 3: A. Colony PCR results of pW1-ZIS-Mvan4662-NPPS-t25ShZPO-t76SlCPR2 and pW1-ZIS-Mvan4662-NPPS-t25ShZPO-t55AtCPR1 in DH5ɑ B. Alignment of sequencing results of pW1-ZIS-Mvan4662-NPPS-ShZPO-SlCPR2 (top) and pW1-ZIS-Mvan4662-NPPS-ShZPO-AtCPR1 (bottom) against the design</b></center>
+
<center><b>Figure 3: A. Gas-phase chromatography results for the pET28a-t25ShZPO-t76SlCPR2 culture with dodecane as solvent B. Mass spectrometry and structure elucidation results of the sample</b></center>
  
−
Fermentation of pW1-ZIS-NPPS-Mvan4662-t25ShZPO-t76SlCPR2 and pW1-ZIS-NPPS-Mvan4662-t25ShZPO-t55AtCPR1 in DH5α was induced by IPTG and lasted 24 hours using dodecane as solvent. After the products were collected and underwent GC-MS analysis, we discovered that 9HZ and 9H10epoZ were not detected. Instead, only 7epiZ was produced. [figure 8A&B]
+
<center><html><img src="https://static.igem.wiki/teams/5184/parts/scie810.webp" width="600"/></html></center>
−
 
+
<center><b>Figure 4: Liquid culture of pET28a-CYP/CPR in BL21(DE3) was harvested, supernatant and precipitate was collected after centrifugation. S: Supernatant, P: Precipitate</b></center>
−
<center><html><img src="https://static.igem.wiki/teams/5184/parts/scie87.webp" width="600"/></html></center>
+
−
<center><b>Figure 4: A. Gas-phase chromatography results for the pW1-ZIS-Mvan4662-NPPS-t25ShZPO-t76SlCPR2 culture with dodecane as solvent B. Mass spectrometry and structure elucidation results of the sample</b></center>
+
−
 
+
−
==References==
+
−
[1]: Dawood, Mohammad H., and John C. Snyder. ‘The Alcohol and Epoxy Alcohol of Zingiberene, Produced in Trichomes of Wild Tomato, Are More Repellent to Spider Mites Than Zingiberene’. Frontiers in Plant Science, vol. 11, Feb. 2020, p. 35. DOI.org (Crossref), https://doi.org/10.3389/fpls.2020.00035.
+
  
 
<!-- Uncomment this to enable Functional Parameter display  
 
<!-- Uncomment this to enable Functional Parameter display  

Revision as of 07:53, 30 September 2024


st-t25ShZPO

To equip our insecticide with enhanced prevention efficacy against spider mites, we also decide to synthesize 9-hydroxy-zingiberene (9HZ) and 9-hydroxy-10,11-epoxy zingiberene (9H10epoZ), two oxidized products of the monocyclic sesquiterpene 7epiZ. However, the zingiberene oxidase ShZPO was originally found in eukaryotic organisms. They were originally immobilized on the ER membrane. However, since E. coli does not have this structure, the 25 amino acid N-terminus ER transit peptide of the oxidase is truncated to enhance solubility and expression rate. Also, a SpyTag is added, which will form an isopeptide bond with the SpyCatcher, thus imitating the colocalization of the two enzymes in eukaryotes. Our usage of sc-t25ShZPO provide future iGEM teams with a novel method to synthesize an enzyme originally found in eukaryotes through a prokaryotic chassis.

Essential Information

Sequences

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
    COMPATIBLE WITH RFC[1000]

Usage and Biology

t25ShZPO is the truncated version of the plant P450 monooxidase, ShZPO, which is responsible for the two sequential oxidations of 7epiZ to produce 9H10,11epoZ via first a hydroxylation at C9 and then a epoxidation and C10 and C11. Like other enzymes of the P450 superfamily, t25ShZPO has a heme group as cofactor to facilitate necessary electron transfers associated with oxidation of its substrate. The oxidase also requires cooperation with a P450 reductase, in context of our part collection SlCPR1 or AtCPR2, to supply the electrons required for its catalytic activities. The 25aa N-terminus ER transit peptide of the oxidase is truncated to enhance solubility and expression rate of the enzyme in E. coli. The SpyTag-SpyCather system was originally found in Streptococcus pyogenes, with its fibronectin-binding protein FbaB containing a domain with a spontaneous isopeptide bond between Lys and Asp. By splitting this domain and rational engineering of the fragments, a peptide (SpyTag) which formed an amide bond to its protein partner (SpyCatcher) in minutes is obtained.

Characterization

To increase the expression level and functionality of oxidase and reductases in E. coli, we introduced the spytag-spycatcher system in addition to truncating the N-terminal anchor regions [figure 9A]. Through the formation of an isopeptide bond between the tag and the catcher, introduction of this system links the oxidase and reductases together, thus facilitating efficient electron transfer. To test whether the enzymes can be expressed successfully in E. coli, we constructed the plasmids, plasmid pW1-ZIS-NPPS-Mvan4662-st t25ShZPO-sc t76SlCPR2, aiming to test whether the enzymes can maintain their functions after expression and whether the SpyTag can be linked to the SpyCatcher [figure 9B]. Also, we incorporated the plasmids pET28a-sc t25ShZPO, pET28a-st t76SlCPR2 and pET28a-sc t55AtCPR1 to test whether the enzymes can be successfully expressed in E. coli.[figure 1C]

Figure 1: A. Attachment of SpyTag and SpyCatcher to two cytochrome P450 enzymes; the formation of isopeptide bond between lysine on SpyCatcher and aspartic acid on SpyTag can link the two enzymes together, this proximity allows electron transfer and thus catalysis of the CYP (t25ShZPO) enzyme to occur B. Plasmid construct of pW1-p-ZIS-Mvan4662-NPPS-T-P-SpyTag-t25ShZPO-SpyCatcher-t76SlCPR2-t C. Plasmid constructs of pET28a-SpyTag-t76SlCPR2, pET28a-SpyCatcher-t25ShZPO, and pET28a-SpyCatcher-t55AtCPR1

We employed GoldenGate Assembly to build the plasmids pW1-ZIS-NPPS-Mvan4662-st t25ShZPO-sc t76SlCPR2, pET28a-sc t25ShZPO, pET28a-st t76SlCPR2, pET28a-sc t55AtCPR1[figure 2A&B] and then transformed the built plasmids into the E. coli strain DH5α. The colony PCR results and sequencing results show that the plasmids are successfully constructed with no mutations.[figure2C&D]

Figure 2: A. Colony PCR results of pET28a-sc t55AtCPR1, pET28a-st t76SlCPR2, and pET28a-sc t25ShZPO B. Alignment of the sequencing results in Fig10A against designed plasmids C. Colony PCR results of pW1-ZIS-Mvan4662-NPPS-st t25ShZPO-sc t76SlCPR2; the insert region is amplified using two sets of primers and their products designated SCIE22E and SCIE22F D. Alignment of the sequencing results of colony PCR products against designed plasmids

Fermentation of pW1-ZIS-NPPS-Mvan4662-st t25ShZPO-sc t76SlCPR2 in DH5α was induced by IPTG and lasted 48 hours using dodecane as solvent. After the products were collected and underwent GC-MS analysis, we discovered that still, 9HZ and 9H10epoZ were not detected. Instead, only 7epiZ was produced.[figure 3A&B] Plasmids pET28a-sc t25ShZPO, pET28a-st t76SlCPR2, pET28a-sc t55AtCPR1 were transformed into E.coli strand BL21(DE3), fermented and induced by IPTG. The SDS-PAGE result shows that only reductases linked with the SpyTag or SpyCatcher could be expressed successfully, and the oxidase was expressed in inclusion bodies.[figure 4]

Figure 3: A. Gas-phase chromatography results for the pET28a-t25ShZPO-t76SlCPR2 culture with dodecane as solvent B. Mass spectrometry and structure elucidation results of the sample
Figure 4: Liquid culture of pET28a-CYP/CPR in BL21(DE3) was harvested, supernatant and precipitate was collected after centrifugation. S: Supernatant, P: Precipitate