Enhanced production of core lipids in oleaginous yeasts
Disclosed are transformed cells comprising one or more genetic modifications that increase the lipid content of the cell, e.g., relative to an unmodified cell of the same type. Also disclosed are methods for increasing the lipid content of a cell by increasing the activity of one or more proteins in the cell and/or by decreasing the activity of one or more proteins in the cell.
1. A recombinant yeast cell, comprising:
a first exogenous nucleic acid sequence encoding a phosphoketolase protein; and
a second exogenous nucleic acid sequence encoding a phosphate acetyltransferase protein from Thermoanaerobacterium saccharolyticum;
wherein the recombinant yeast cell does not express an endogenous functional phosphofructokinase protein.
2. The recombinant yeast cell of claim 1 , wherein the first nucleic acid sequence comprises SEQ ID NO:22, SEQ ID NO:24, SEQ ID NO:26, SEQ ID NO:28, SEQ ID NO:30, SEQ ID NO:32, SEQ ID NO:122, SEQ ID NO:124, or SEQ ID NO:126.
3. The recombinant yeast cell of claim 1 , wherein the first nucleic acid sequence encodes an amino acid sequence having at least 95% sequence identity to SEQ ID NO:21, SEQ ID NO:23, SEQ ID NO:25, SEQ ID NO:27, SEQ ID NO:29, SEQ ID NO:31, SEQ ID NO:121, SEQ ID NO:123, or SEQ ID NO:125.
4. The recombinant yeast cell of claim 1 , wherein the second nucleic acid sequence comprises SEQ ID NO:120 or SEQ ID NO:76.
5. The recombinant yeast cell of claim 1 , wherein the second nucleic acid sequence encodes an amino acid sequence having at least 95% sequence identity with SEQ ID NO:75.
6. The recombinant yeast cell of claim 1 , wherein the phosphofructokinase protein is encoded by a nucleic acid sequence comprising SEQ ID NO:142, SEQ ID NO:154, or SEQ ID NO:156.
7. The recombinant yeast cell of claim 1 , further comprising a deletion of a nucleic acid sequence encoding a native transaldolase protein.
8. The recombinant yeast cell of claim 7 , wherein the recombinant cell comprises a deletion of a transaldolase protein classified by Enzyme Commission number EC 2.2.1.2.
9. The recombinant yeast cell of claim 7 further comprising a nucleic acid that encodes a soluble transhydrogenase protein or an external oxidoreductase protein.
10. The recombinant yeast cell of claim 1 , wherein the cell is selected from the group consisting of Arxula, Aspegillus, Aurantiochytrium, Candida, Claviceps, Cryptococcus, Cunninghamella, Geotrichum, Hansenula, Kluyveromyces, Kodamaea, Leucosporidiella, Lipomyces, Mortierella, Ogataea, Pichia, Prototheca, Rhizopus, Rhodosporidium, Rhodotorula, Saccharomyces, Schizosaccharomyces, Tremella, Trichosporon, Wickerhamomyces , and Yarrowia.
11. The recombinant yeast cell of claim 10 , wherein the cell is selected from the group consisting of Arxula adeninivorans, Aspergillus niger, Aspergillus orzyae, Aspergillus terreus, Aurantiochytrium limacinum, Candida utilis, Claviceps purpurea, Cryptococcus albidus, Cryptococcus curvatus, Cryptococcus ramirezgomezianus, Cryptococcus terreus, Cryptococcus wieringae, Cunninghamella echinulata, Cunninghamella japonica, Geotrichum fermentans, Hansenula polymorpha, Kluyveromyces lactis, Kluyveromyces marxianus, Kodamaea ohmeri, Leucosporidiella creatinivora, Lipomyces lipofer, Lipomyces starkeyi, Lipomyces tetrasporus, Mortierella isabellina, Mortierella alpina, Ogataea polymorpha, Pichia ciferrii, Pichia guilliermondii, Pichia pastoris, Pichia stipites, Prototheca zopfii, Rhizopus arrhizus, Rhodosporidium babjevae, Rhodosporidium toruloides, Rhodosporidium paludigenum, Rhodotorula glutinis, Rhodotorula mucilaginosa, Saccharomyces cerevisiae, Schizosaccharomyces pombe, Tremella enchepala, Trichosporon cutaneum, Trichosporon fermentans, Wickerhamomyces ciferrii , and Yarrowia lipolytica.
12. The recombinant yeast cell of claim 11 , wherein the cell is selected from the group consisting of Arxula adeninivorans, Saccharomyces cerevisiae , and Yarrowia lipolytica.
13. The recombinant yeast cell of claim 1 , wherein the cell is not Saccharomyces cerevisiae.
14. The recombinant yeast cell of claim 1 , wherein the cell does not comprise a deletion, mutation, or substitution in a native pyruvate decarboxylase gene.
15. The recombinant yeast cell of claim 1 , wherein the cell produces a product selected from the group consisting of an oil, a lipid, a fatty acid, a fatty alcohol, and a triacylglyceride.
16. The recombinant yeast cell of claim 1 , wherein the cell produces a higher lipid yield relative to an unmodified cell of the same type under the same conditions.
17. A method of collecting a product from a yeast cell, comprising:
transforming the yeast cell with a first nucleic acid sequence that encodes a phosphoketolase protein;
transforming the yeast cell with a second nucleic acid sequence that encodes a phosphate acetyltransferase protein;
eliminating expression of a functional native phosphofructokinase protein in the yeast cell; and
collecting the product from the yeast cell, wherein the product is an oil, a lipid, a fatty acid, a fatty alcohol, or a triacylglyceride.
18. The method of claim 17 , wherein the first nucleic acid sequence encodes an amino acid sequence having at least 95% sequence identity with the sequence set forth in SEQ ID NO:21, SEQ ID NO:23, SEQ ID NO:25, SEQ ID NO:27, SEQ ID NO:29, SEQ ID NO:31, SEQ ID NO:121, SEQ ID NO:123, or SEQ ID NO:125.
19. The method of claim 17 , wherein the second nucleic acid sequence encodes an amino acid sequence having at least 95% sequence identity with the sequence set forth in SEQ ID NO:1, SEQ ID NO:3, SEQ ID NO:5, SEQ ID NO:33, SEQ ID NO:35, SEQ ID NO:37 SEQ ID NO:39, SEQ ID NO:41, SEQ ID NO:43, SEQ ID NO:45, SEQ ID NO:47, SEQ ID NO:49, SEQ ID NO:51, SEQ ID NO:53, SEQ ID NO:55, SEQ ID NO:57, SEQ ID NO:59, SEQ ID NO:61, SEQ ID NO:63, SEQ ID NO:65, SEQ ID NO:67, SEQ ID NO:69, SEQ ID NO:71, SEQ ID NO:73, SEQ ID NO:75, SEQ ID NO:77, SEQ ID NO:79, SEQ ID NO:81, SEQ ID NO:83, SEQ ID NO:85, SEQ ID NO:87, SEQ ID NO:89, SEQ ID NO:91, SEQ ID NO:93, SEQ ID NO:95, SEQ ID NO:97, SEQ ID NO:99, SEQ ID NO:101, SEQ ID NO:103, SEQ ID NO:105, SEQ ID NO:107, SEQ ID NO:109, SEQ ID NO:111, SEQ ID NO:113, SEQ ID NO:115, SEQ ID NO:117, or SEQ ID NO:119.
20. The method of claim 17 wherein the phosphofructokinase protein is encoded by a nucleic acid sequence comprising SEQ ID NO:142, SEQ ID NO:154, or SEQ ID NO:156.
21. The method of claim 17 , wherein the product is stearic acid, oleic acid, linoleic acid, capric acid, caprylic acid, caproic acid, lauric acid, myristic acid, palmitic acid, palmitoleic acid, or squalene.