Methods and compositions for producing fatty alcohols
Methods and compositions, including nucleotide sequences, amino acid sequences, and host cells, for producing fatty alcohols are described.
1. A method of producing a fatty alcohol composition, the method comprising expressing in an E. coli cell a gene encoding a polypeptide comprising an amino acid sequence having at least 80% sequence identity to the amino acid sequence selected from group consisting of SEQ ID NO: 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62, 64, 66, 68, 70, 72, 74, 76, 78, 80, 82, 84, 86, 88, 90, 92, 264, 266, 268, 270, and 272 wherein said polypeptide has carboxylic acid reductases activity, and a gene encoding a polypeptide having alcohol dehydrogenase (EC 1.1.1.*) activity, wherein the alcohol dehydrogenase polypeptide is overexpressed and converts a fatty aldehyde to a fatty alcohol to provide an E. coli cell culture comprising the fatty alcohol composition.
2. The method of claim 1 , wherein the E. coli cell expresses an attenuated level of at least one fatty acid degradation enzyme relative to a wild type E. coli cell.
3. The method of claim 2 , wherein the at least one fatty acid degradation enzyme has acyl-CoA synthase activity.
4. The method of claim 1 , wherein the fatty alcohol composition comprises a C12 fatty alcohol, C14:1 fatty alcohol, C14:0 fatty alcohol, C16:0 fatty alcohol, and C16:1 fatty alcohol.
5. The method of claim 4 , wherein the C12 fatty alcohol, C14:1 fatty alcohol, C14:0 fatty alcohol, C16:0 fatty alcohol, and C16:1 fatty alcohol are each a primary alcohol.
6. The method of claim 1 , wherein the fatty alcohol composition has a C12 to C14 ratio of 3 to 1.
7. The method of claim 1 , wherein the fatty alcohol composition comprises an unsaturated fatty alcohol.
8. The method of claim 7 , wherein the unsaturated fatty alcohol is C10:1, C12:1, C14:1, C16:1, or C18:1.
9. The method of claim 8 , wherein the fatty alcohol is unsaturated at the omega-7 position.
10. The method of claim 7 , wherein the unsaturated fatty alcohol comprises a cis double bond.
11. The method of claim 1 , wherein the fatty alcohol composition comprises a saturated fatty alcohol.
12. The method of claim 11 , wherein the fatty alcohol is a C12 or C14 fatty alcohol.
13. The method of claim 1 , wherein said fatty alcohol is produced by a malonyl-CoA-independent pathway.
14. The method of claim 1 , further comprising isolating the fatty alcohol composition from the E. coli cell culture.
15. The method of claim 1 , wherein the host cell comprises polynucleotide sequences encoding a polypeptide having thioesterase (EC 3.1.2.14 or EC 3.1.1.5) activity effective to release a fatty acid from acyl-ACP.
16. The method of claim 14 , wherein the fatty alcohol composition comprises C12 and C14 fatty alcohols that are primary alcohols.
17. The method of claim 16 , wherein the fatty alcohol composition comprises an unsaturated fatty alcohol.