Methods for production of oxygenated terpenes
The present disclosure relates to methods for producing oxygenated terpenoids, and preparation of compositions and formulations thereof. Polynucleotides, derivative enzymes, and host cells for use in such methods are also provided.
1. A method of making a formulation comprising nootkatone, α-nootkatol, and β-nootkatol, the method comprising:
contacting valencene with Stevia rebaudiana Kaurene Oxidase (SrKO) or an SrKO derivative comprising a sequence having at least 70% sequence identity to SEQ ID NO: 37, SEQ ID NO: 38, or SEQ ID NO: 55, and having valencene oxidizing activity in an in vitro or in vivo system to produce an oxygenated product comprising nootkatone, α-nootkatol, and β-nootkatol.
2. The method of claim 1 , further comprising processing the oxygenated product by fractional distillation to yield two or more fractions of the oxygenated product.
3. The method of claim 2 , further comprising blending the two or more fractions of the oxygenated product.
4. The method of claim 1 , further comprising adding an unoxygenated product to the oxygenated product, one or more fractions of the oxygenated product, or the formulation.
5. The method of claim 1 , wherein the nootkatone is present in the formulation in an amount ranging from about 55% to about 60% (w/w), the α-nootkatol is present in the formulation in an amount ranging from about 20% to about 25% (w/w), and the β-nootkatol is present in the formulation an amount ranging from about 5% to about 10% (w/w).
6. The method of claim 4 , wherein the unoxygenated product comprises valencene.
7. The method of claim 6 , wherein the valencene is present in the formulation in an amount ranging from about 5% to about 10% (w/w).
8. The method of claim 1 , wherein the SrKO derivative comprises a sequence having at least 90% sequence identity to SEQ ID NO: 55; wherein the SrKO derivative has one or more mutations relative to SEQ ID NO: 37, 38, or 55; or wherein the SrKO derivative has a deletion of at least a portion of its N-terminal transmembrane region, and the addition of an inner membrane transmembrane domain from E. coli yhcB.
9. The method of claim 1 , wherein the SrKO derivative is SrKO comprising at least one of:
at least one substitution mutation located at a position selected from a group of 46, 76, 94, 131, 231, 284, 383, 390, 400, 444, 468, 488 and 499, relative to SEQ ID NO: 37;
at least one substitution mutation selected from a group of I310V, V375I and T487N, relative to SEQ ID NO: 38;
a 15 to 35 amino acid deletion of an N-terminal transmembrane domain in the SrKO and addition of 15 to 25 amino acids of E. coli yhcB transmembrane domain; or
a linker comprising amino acids and cytochrome P450 reductase truncated at its N-terminus.
10. The method of claim 9 , wherein the SrKO derivative comprising the substitution mutation T487N further comprises at least one substitution mutation selected from V375F, V375A, V375M, M120L, M1201, M120V, F129L, F1291, L114V, L114F, and V121A relative to SEQ ID NO: 38.
11. The method of claim 1 , wherein the SrKO derivative comprises at least one substitution mutation selected from R76K, M94V, T131Q, I390L, and T468I relative to SEQ ID NO: 37.
12. The method of claim 1 , wherein the SrKO derivative comprises:
an amino acid sequence selected from SEQ ID NOS: 55-61, 104, and 105; or
an amino acid sequence having from one to twenty mutations relative to a sequence selected from SEQ ID NOS: 55-61, 104, and 105.
13. The method of claim 1 , wherein the SrKO derivative comprises:
a 20-amino acid truncation of the SrKO N-terminus and an addition of an 8-amino acid membrane anchor of E. coli yhcB; or
a 30-amino acid truncation of the SrKO N-terminus and an addition of a membrane anchor based on 22 amino acids of E. coli yhcB.
14. The method of claim 1 wherein the contacting takes place in a host cell, which is a bacterium or yeast.
15. The method of claim 14 , wherein the host cell is a bacterium selected from E. coli, Bacillus subtilis , or Pseudomonas putida ; or a yeast selected from a species of Saccharomyces, Pichia , or Yarrowia.
16. The method of claim 14 , wherein the host cell produces isopentenyl pyrophosphate (IPP) through an endogenous or heterologous MEP or MVA pathway, and optionally through an endogenous MEP pathway having at least one additional copy of a dxs, ispD, ispF, and/or idi gene.
17. The method of claim 16 , wherein the host cell further expresses a farnesyl pyrophosphate synthase and a heterologous valencene synthase.
18. The method of claim 17 , wherein the valencene synthase is Citrus sinensis of SEQ ID NO: 12 or Vitis vinifera valencene synthase of SEQ ID NO:1 or derivative thereof having at least 70% sequence identity to SEQ ID NO: 12 or SEQ ID NO: 1.
19. The method of claim 1 wherein the SrKO is expressed in a host cell that co-expresses a cytochrome P450 reductase, which is optionally from Stevia sp.
20. The method of claim 19 , wherein the host cell further expresses an alcohol dehydrogenase producing nootkatone from nootkatol, which is optionally an alcohol dehydrogenase selected from Rhodococcus erythropolis CDH of SEQ ID NO: 84, Citrus sinensis DH3 of SEQ ID NO: 92, Vitis vinifera DH of SEQ ID NO: 94, Citrus sinensis ABA2 of SEQ ID NO: 98 , Brachypodium distachyon DH of SEQ ID NO: 100, and Zingiber zerumbet SDR of SEQ ID NO: 102, or a derivative thereof having at least 70% sequence identity thereto.