The present invention relates to variant thioesterases and their use in plants, e.g., to increase enzymatic activity and to promote increased production of mid-chain length fatty acids (e.g., 8 to 14 carbons) and at desired ratios. Further disclosed herein are methods of manufacturing renewable chem
The present invention relates to variant thioesterases and their use in plants, e.g., to increase enzymatic activity and to promote increased production of mid-chain length fatty acids (e.g., 8 to 14 carbons) and at desired ratios. Further disclosed herein are methods of manufacturing renewable chemicals through the manufacture of novel triglyceride oils followed by chemical modification of the oils. Oils containing fatty acid chain lengths of C8, C10, C12 or C14 are also disclosed and are useful as feedstocks in the methods described herein.
대표청구항▼
1. A non-natural fatty acyl-ACP thioesterase wherein the non-natural thioesterase has at least 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% identity to SEQ ID NO: 1 and comprises: i) Tyrosine (Y) or phenylalanine (F) at the position corresponding to position 163 of SEQ ID NO: 1 and lysine
1. A non-natural fatty acyl-ACP thioesterase wherein the non-natural thioesterase has at least 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% identity to SEQ ID NO: 1 and comprises: i) Tyrosine (Y) or phenylalanine (F) at the position corresponding to position 163 of SEQ ID NO: 1 and lysine (K), or alanine (A) at the position corresponding to position 186 of SEQ ID NO: 1; orii) Phenylalanine (F) at the position corresponding to position 163 of SEQ ID NO: 1 and/or proline (P), lysine (K), or alanine (A) at the position corresponding to position 186 of SEQ ID NO: 1, wherein the non-natural thioesterase catalyzes the production of increased levels of C8:0 and C10:0 fatty acids in comparison to a wild-type thioesterase. 2. A method for producing a triglyceride oil, the method comprising expressing, in a host cell, the non-natural thioesterase of claim 1; cultivating the host cell; and isolating the oil. 3. A method for increasing the C8 and/or C10 fatty acids in a fatty acid profile of an oil produced by an optionally oleaginous host cell, the method comprising, providing a parent gene encoding a fatty acyl-ACP thioesterase enzyme, mutating the gene to so as to encode a non-natural thioesterase of claim 1; expressing the mutated gene in the host cell; and producing the oil, whereby the C8 and/or C10 fatty acids in the fatty acid profile of the oil are increased. 4. The non-natural fatty acyl-ACP thioesterase of claim 1, further comprising a lysine (K) at the position corresponding to position 228 of SEQ ID NO: 1. 5. A method for producing a triglyceride oil, the method comprising expressing, in a host cell, the non-natural thioesterase of claim 4. 6. The method of claim 3, comprising further mutating the gene so as to encode a non-natural fatty acyl-ACP thioesterase further comprising a lysine (K) at the position corresponding to position 228 of SEQ ID NO: 1. 7. An isolated polynucleotide encoding a non-natural fatty acyl-ACP thioesterase wherein the non-natural thioesterase has at least 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% identity to SEQ ID NO: 1 and comprises: i) Tyrosine (Y) or phenylalanine (F) at the position corresponding to position 163 of SEQ ID NO: 1 and lysine (K), or alanine (A) at the position corresponding to position 186 of SEQ ID NO: 1; orii) Phenylalanine (F) at the position corresponding to position 163 of SEQ ID NO: 1 and/or proline (P), lysine (K), or alanine (A) at the position corresponding to position 186 of SEQ ID NO: 1, wherein the non-natural thioesterase catalyzes the production of increased levels of C8:0 and C10:0 fatty acids in comparison to a wild-type thioesterase. 8. The isolated polynucleotide of claim 7, wherein the polynucleotide encodes a non-natural thioesterae further comprising a lysine (K) at the position corresponding to position 228 of SEQ ID NO: 1. 9. An expression cassette comprising the isolated polynucleotide of claim 7. 10. A host cell comprising the expression cassette of claim 9. 11. The host cell of claim 10, wherein the cell is an oleaginous microalga cell. 12. The host cell of claim 11, wherein the microalga cell is classified as Chlorophyta, Trebouxiophyceae, Chlorellales, Chlorellaceae, or Chlorophyceae. 13. The host cell of claim 11, wherein the microalga cell is of a genus selected from the group consisting of Chlorella, Dunaliella, and Prototheca. 14. The host cell of claim 9, wherein the microalga cell is of a species selected from the group consisting of Prototheca moriformis and Chlorella protothecoides.
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