The cannabinoid biosynthetic pathway has been the subject of intense investigation. Cloning and expression of the various enzymes in the cannabinoid biosynthetic pathway has been accomplished by several research groups. For example, the structure and function of Δ1-tetrahydrocannabinolic acid synthase, i.e., a cannabinoid synthase, has been elucidated. See Shoyama et al., J. Mol. Biol. 2012, 423(1):96-105.
The biosynthesis of two cannabinoids, cannabidiolic acid and Δ9-tetrahydrocannabinolic acid, has been accomplished by expressing cannabinoid biosynthetic pathway enzymes from Cannabis sativa and other organisms heterologously in Saccharomyces cerevisiae. See, e.g., Luo et al., Nature 2019, 567(7746):123-126 and Zirpel et al., J. Biotechnol. 2017, 259:204-212. Studies such as these have established that it is possible to build the cannabinoid biosynthetic pathway in a heterologous system.
Additional enzymes and methods are needed for synthesizing cannabinoids with specificity and high yield.
A method is disclosed for producing a cannabinoid. The method includes the steps of contacting cannabigerolic acid with a cannabinoid synthase orthologue. The cannabinoid synthase orthologue is from an organism other than Cannabis sativa, e.g., Citrus sinensis, Cucumis melo, Capsicum annuum, Brassica napus, Nicotiana attenuata, Nicotiana tabacum, Noccaea caerulescens (Thlaspi caerulescens), Gossypium hirsutum (Gossypium mexicanum), Oryza sativa subsp. indica, Oryza sativa subsp. japonica, Arabidopsis lyrata subsp. lyrata, Paenibacillus sp. Aloe-11, Streptomyces ipomoeae 91-03, Brassica rapa subsp. pekinensis, Prunus persica, Bacillus subtilis 168, Arabidopsis thaliana, Papaver somniferum and Phytophthora parasitica P1569.
Also provided are recombinant cells of Saccharomyces cerevisiae and Pichia pastoris that each include in their genomes a nucleic acid encoding a cannabinoid synthase orthologue, wherein the cannabinoid synthase orthologue is from any of the organisms listed in the preceding paragraph, and the cannabinoid synthase orthologue is expressed in the recombinant cells in an active form.
The details of one or more embodiments are set forth in the description and the examples below. Other features, objects, and advantages will be apparent from the detailed description, from the drawings, and also from the appended claims.
The invention description below refers to the accompanying drawings, of which:
Disclosed are enzymes that catalyze the biosynthesis of cannabinoids from CBGA. These enzymes, not previously known as cannabinoid synthases, are from organisms other than Cannabis sativa. The enzymes can be recombinantly expressed in Saccharomyces cerevisiae and Pichia pastoris in an active form.
The method summarized above for producing a cannabinoid requires contacting CBGA with a cannabinoid synthase orthologue not from Cannabis sativa. The source of the cannabinoid synthase orthologue can be, but is not limited to, Citrus sinensis, Brassica napus, Nicotiana attenuate, Gossypium hirsutum, Oryza sativa subsp. indica, Oryza sativa subsp. japonica, Arabidopsis lyrata subsp. lyrata, Paenibacillus sp. Aloe-11, Streptomyces ipomoeae 91-03, Brassica rapa subsp. pekinensis, Prunus persica, Bacillus subtilis 168, Arabidopsis thaliana, Papaver somniferum, and Phytophthora parasitica P1569.
The cannabinoid synthase orthologue can be, but is not limited to, those shown in Tables 1 and 2 below. Exemplary cannabinoid synthase orthologues can have the amino acid sequence of SEQ ID NOs: 7, 16, 23, 31, 37, 47, 57, 67, 77, 87, 97, 107, 117, and 127, or a sequence having 70% or greater (e.g., 70%, 75%, 80%, 85%, 90%, 95%, and 99%) identity to SEQ ID NOs: 7, 16, 23, 31, 37, 47, 57, 67, 77, 87, 97, 107, 117, and 127.
The method set forth above can produce cannabinoids having a formula weight of 358.5 g/mol, 374.5 g/mol, or 330.5 g/mol. In a particular method, cannabinoids having a formula weight of 358.5 g/mol, 374.5 g/mol, and 330.5 g/mol are each produced.
Another method produces cannabielsoic acid and cannabielsoin. An example of this method produces cannabinoids that include both cannabielsoic acid and cannabielsoin but the products are free of any cannabinoid having a formula weight of 358.5 g/mol. In this exemplary method, the cannabinoid synthase orthologue includes the amino acid sequence of SEQ ID NOs: 67, 77, 97, or 127 or a sequence having 70% or greater identity to SEQ ID NOs: 67, 77, 97, or 127.
In the methods described above, the cannabinoid synthase orthologue can be a recombinant enzyme. The recombinant enzyme can be produced in, e.g., Saccharomyces cerevisiae, Yarrowia lipolytica, Kluyveromyces marxianus, and Pichia pastoris. A specific method features a recombinant enzyme produced in Saccharomyces cerevisiae or Pichia pastoris.
Also mentioned above is a recombinant cell of Saccharomyces cerevisiae or Pichia pastoris contains in its genome a nucleic acid encoding a cannabinoid synthase orthologue. The orthologue is from an organism other than Cannabis sativa. Exemplary sources of the cannabinoid synthase orthologue are listed above and shown in Tables 1 and 2 below.
The recombinant cell can contain a nucleic acid that encodes a cannabinoid synthase orthologue that includes an amino acid sequence selected from the group consisting of SEQ ID NOs: 7, 16, 23, 31, 37, 47, 57, 67, 77, 87, 97, 107, 117, and 127, or a sequence having 70% or greater (e.g., 70%, 75%, 80%, 85%, 90%, 95%, and 99%) identity to SEQ ID NOs: 7, 16, 23, 31, 37, 47, 57, 67, 77, 87, 97, 107, 117, and 127.
Without further elaboration, it is believed that one skilled in the art can, based on the disclosure herein, utilize the present disclosure to its fullest extent. The following specific examples are, therefore, to be construed as merely descriptive, and not limitative of the remainder of the disclosure in any way whatsoever. All publications cited herein are incorporated by reference in their entirety.
Based on its sequence, THCA synthase can be classified as a berberine-bridge FAD-dependent enzyme. Through a search of available sequence databases, 232 related genes were identified that are annotated in the UniProt database as berberine-bridge FAD dependent enzymes. In other words, these 232 genes were potential cannabinoid synthase orthologues.
Each gene sequence was codon-optimized for S. cerevisiae protein expression, synthesized, and cloned into pYES2-CT vector (Thermo Fisher). The vectors were transformed separately into S. cerevisiae BY4741 cells using chemical treatment and grown on SC-URA-glucose selection plates for two days at 30° C. Three single colonies from each plate were picked and replicated onto SC-URA-glucose selection plates and incubated for two days at 30° C. The replicated colonies were grown in 10 mL SC-URA-glucose media for 16 h at 30° C. The cells were then harvested and resuspended in 5 mL SC-URA-galactose media and grown for protein expression for 16 h at 30° C. After 16 h, the cells were harvested again and stored at −20° C. Cells not carrying any cannabinoid synthase orthologue were also prepared as above to serve as a negative control.
The cells were resuspended in 400 μL of 100 mM citrate buffer, pH 5.5 with 1 mM MgCl2 and 5 units of lyticase. The cells were incubated at 37° C. with shaking for 1 h. One gram of glass beads was added to the suspension and the cells were cracked open using the MP Biomedical FastPrep 24 Tissue Homogenizer. Cell debris was removed by centrifugation for 30 min. at 14,800 rpm at 4° C.
The potential cannabinoid synthase orthologues were tested for enzymatic activity as follows. In a reaction volume of 55 μL, 2.5 μL of 1 mg/mL CBGA, 2.5 μL of 20 mM FAD, and 50 μL of yeast cell supernatants prepared as above were combined and incubated under ambient conditions. A corresponding control reaction lacking CBGA was also carried out. After 24 h, the reactions were extracted three times with ethyl acetate. Samples of the extracted material were dried under vacuum and redissolved in acetonitrile for mass analysis using negative ion mode. EIC for m/z=357.5 and m/z=373.5 were generated for each sample to determine if the biosynthesis of a cannabinoid was catalyzed by the orthologues. The potential reaction products are shown in
For each potential cannabinoid synthase orthologue, three single yeast colonies were picked and grown as mentioned above. The cell supernatant prepared from each colony was split into six portions. Three portions were incubated with CBGA and three portions were not incubated with CBGA as the negative control reaction. In total, for each potential orthologue, nine reactions were performed in the presence of CBGA and nine reactions were not incubated with CBGA.
A sample incubated with CBGA was considered to be positive for cannabinoid synthesis if the extracted material had a chromatographic peak area in EIC having an abundance of at least 800,000 at m/z=357.5 and/or m/z=373.5. A potential cannabinoid synthase orthologue was considered to be positive if seven out of the nine total reactions with CBGA were positive using the above criteria. The results are shown in Table 1 below, as well as in
Citrus sinensis
Brassica napus
Nicotiana attenuata
Gossypium hirsutum
Oryza sativa subsp. indica
Oryza sativa subsp. indica (Rice)
Oryza sativa subsp. japonica
Oryza sativa subsp. japonica
Arabidopsis lyrata subsp. lyrata
Paenibacillus sp. Aloe-11
Streptomyces ipomoeae 91-03
Streptomyces ipomoeae 91-03
Brassica rapa subsp. pekinensis
Prunus persica
Prunus persica
Bacillus subtilis (strain 168)
Arabidopsis thaliana
Arabidopsis thaliana
Papaver somniferum
Arabidopsis thaliana
Arabidopsis thaliana
Arabidopsis thaliana
Arabidopsis thaliana
Arabidopsis thaliana
Arabidopsis thaliana
Arabidopsis thaliana
Arabidopsis thaliana
Arabidopsis thaliana
Arabidopsis thaliana
Arabidopsis thaliana
Phytophthora parasitica P1569
Out of the 72 cannabinoid synthase orthologues tested, 20 showed the production of a cannabinoid with a molecular formula of C22H30O4(MW=358.5; m/z 357.5) and 16 orthologues showed the production of a cannabinoid with a molecular formula of C22H30O4(MW=374.5; m/z 373.5). Five orthologues showed the production of both types of cannabinoids. See Table 1 above.
Genes encoding orthologues that showed cannabinoid synthase activity using CBGA as substrate were cloned into a P. pastoris expression system for larger scale protein expression. The expression of THCA synthase in P. pastoris was previously demonstrated. See, e.g., Zirpel et al., Biotechnology Lett. 2015, 37(9):1869-1875 and Lange et al., J. Biotechnol. 2015, 211:68-76.
The genes were cloned into the pPICZA plasmid (Invitrogen) and subsequently integrated into the P. pastoris genome using standard techniques. The resulting P. pastoris integrants were inoculated from agar plates and incubated in 20 mL buffered complex glycerol medium in baffled flasks at 30° C. for 48 h with shaking at 190 rpm. Cells were harvested by centrifugation and resuspended in 200 mL buffered methanol complex medium containing 0.5% w/v casamino acids and 0.01% w/v riboflavin. The expression of orthologue proteins was induced by adding 1% methanol every 24 h for a total of 120 hr.
Cells were harvested by centrifugation and resuspended in Buffer A (100 mM Tris, pH 8.0 and 150 mM NaCl). The cells were lysed using an M110P Microfluidizer® (Microfluidics International Corp.). Cell debris was removed by centrifugation and the cell lysates were loaded onto a 5 mL StrepTrap™ HP column (Cytiva Life Sciences) with a flow rate of 1 mL/min. The column was washed with 25 mL Buffer A, i.e., 5 column volumes (“CV”), and eluted with 6 CV Buffer B (100 mM Tris, pH 8.0, 150 mM NaCl, and 2.5 mM desthiobiotin). Fractions containing protein, identified by an increase in absorbance at 280 nm, were pooled, concentrated, and frozen at −80° C.
In a reaction volume of 50 μL, the cannabinoid synthase purified from was incubated with 150 μM CBGA and 0.2 mM FAD in 50 mM citrate, pH 8.0. The reaction was incubated for 24-48 h at 30° C., followed by the addition of 160 μL of acetonitrile to stop the reaction and precipitate the protein. The mixture (120 μL) was injected into an Agilent InfinityLab Poroshell 120 EC-C18 column for mass analysis using the Agilent 1290 Infinity HPLC coupled with Agilent 6550 iFunnel Q-TOF high resolution mass spectrometer in the negative ion mode. EICs for m/z=357.2071, m/z=373.2020, and m/z=329.2122 were generated for each sample to determine if the biosynthesis of a potential cannabinoid was catalyzed by the orthologue.
The results are shown in
Arabidopsis lyrata subsp.
lyrata
Brassica rapa subsp.
pekinensis
Nicotiana attenuata
Prunus persica
Arabidopsis thaliana
Papaver somniferum
Capsicum annuum
Nicotiana tabacum
Cucumis melo
Capsicum annuum
Gossypium hirsutum
Noccaea caerulescens
Noccaea caerulescens
Cucumis melo
Out of the 232 potential CBS orthologs screened, seven orthologs showed the production of two types of cannabinoids, (i) the “cannabidiolic acid group” type having a molecular formula of C22H30O4(FW=358.5; m/z=357.2071, see
All of the features disclosed in this specification may be combined in any combination. Each feature disclosed in this specification may be replaced by an alternative feature serving the same, equivalent, or similar purpose. Thus, unless expressly stated otherwise, each feature disclosed is only an example of a generic series of equivalent or similar features.
From the above description, one skilled in the art can easily ascertain the essential characteristics of the present invention, and without departing from the spirit and scope thereof, can make various changes and modifications of the invention to adapt it to various usages and conditions. Thus, other embodiments are also within the scope of the following claims.
Filing Document | Filing Date | Country | Kind |
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PCT/SG2020/050583 | 10/12/2020 | WO |
Number | Date | Country | |
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62913991 | Oct 2019 | US |