Heterotrophically cultivated recombinant microalgae
Disclosed herein are methods of manufacturing renewable chemicals through the manufacture of novel triglyceride oils followed by chemical modification of the oils. Methods such as transesterification, hydrogenation, hydrocracking, deoxygenation, isomerization, interesterification, hydroxylation, hydrolysis and saponification are disclosed. Novel oils containing fatty acid chain lengths of C8, C10, C12 or C14 are also disclosed and are useful as feedstocks in the methods of the invention.
1. A microalgal host cell comprising recombinant nucleic acids encoding a Prototheca nitrogen responsive promoter and a heterologous gene encoding a fatty acid synthetic pathway protein, wherein the Prototheca nitrogen responsive promoter is operably linked to the coding sequence of the heterologous gene, and wherein the Prototheca nitrogen responsive promoter comprises the polynucleotide sequence of SEQ ID NO: 96.
2. The microalgal host cell of claim 1 , wherein the fatty acid synthetic pathway protein is selected from the group consisting of fatty acyl-ACP thioesterase, acyl carrier protein, ω-3 fatty acid desaturase, and ω-6-oleate desaturase.
3. The microalgal host cell of claim 1 , wherein the host cell is of the genus Prototheca.
4. The microalgal cell of claim 3 , wherein the host cell is of the species Prototheca moriformis.
5. A polynucleotide comprising nucleic acids encoding a Prototheca nitrogen responsive promoter and a heterologous gene encoding a fatty acid synthetic pathway protein, wherein the Prototheca nitrogen responsive promoter is operably linked to the coding sequence of the heterologous gene, wherein the Prototheca nitrogen responsive promoter comprises the polynucleotide sequence of SEQ ID NO: 96.
6. The polynucleotide of claim 5 , wherein the fatty acid synthetic pathway protein is selected from the group consisting of fatty acyl-ACP thioesterase, acyl carrier protein, ω-3 fatty acid desaturase, and ω-6-oleate desaturase.
7. A method of heterotrophically cultivating the microalgal host cell of claim 1 in a fermentation medium, the method comprising the steps of:
a. providing the microgalal host cell;
b. adding a fixed carbon source to the fermentation medium; and
c. cultivating the microalgal host cell.
8. The method of claim 7 , wherein the fermentation medium is a nutrient limiting fermentation medium.