SYNTHESIS OF LONG-CHAIN POLYUNSATURATED FATTY ACIDS BY RECOMBINANT CELL

• US 20170073712A1
• Filed: 09/23/2016
• Published: 03/16/2017
• Est. Priority Date: 04/22/2004
• Status: Active Grant

• Current Assignee: Commonwealth Scientific & Industrial Research Organisation (Commonwealth Of Australia As Represented By Department Of Industry, Innovation, Climate Change, Science, Research And Tertiary Education)
• Original Assignee: Commonwealth Scientific & Industrial Research Organisation (Commonwealth Of Australia As Represented By Department Of Industry, Innovation, Climate Change, Science, Research And Tertiary Education)
• Inventors: Singh, Surinder Pal, Robert, Stanley Suresh, Nichols, Peter David, Blackburn, Susan Irene Ellis, Zhou, Xue-Rong, Petrie, James Robertson, Green, Allan Graham
• Granted Patent: US 9,951,357 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: A01H 5/10 Seeds
• CPC Class Codes: A23K 10/12 by fermentation of natural products, e.g. of vegetable material, animal waste material or biomass
• CPC Class Codes: A23K 10/30 from material of plant origin, e.g. roots, seeds or hay; from material of fungal origin, e.g. mushrooms obtained by microbiological or biochemical processes, e.g. using yeasts or enzymes, A23K10/10
• CPC Class Codes: A23K 20/158 Fatty acids; Fats; Products containing oils or fats
• CPC Class Codes: A61P 3/00 Drugs for disorders of the metabolism of the blood or the extracellular fluid A61P7/00
• CPC Class Codes: A61P 3/02 Nutrients, e.g. vitamins, minerals
• CPC Class Codes: C11B 1/10 by extracting
• CPC Class Codes: C11C 3/12 by hydrogenation
• CPC Class Codes: C12N 15/52 Genes encoding for enzymes or proenzymes
• CPC Class Codes: C12N 15/8247 involving modified lipid metabolism, e.g. seed oil composition
• CPC Class Codes: C12N 9/0071 acting on paired donors with incorporation of molecular oxygen (1.14)
• CPC Class Codes: C12N 9/0083 Miscellaneous (1.14.99)
• CPC Class Codes: C12N 9/1029 transferring groups other than amino-acyl groups (2.3.1)
• CPC Class Codes: C12P 7/64 Fats; Fatty oils; Ester-type waxes; Higher fatty acids, i.e. having at least seven carbon atoms in an unbroken chain bound to a carboxyl group; Oxidised oils or fats
• CPC Class Codes: C12P 7/6427 Polyunsaturated fatty acids [PUFA], i.e. having two or more double bonds in their backbone
• CPC Class Codes: C12P 7/6432 Eicosapentaenoic acids [EPA]
• CPC Class Codes: C12P 7/6434 Docosahexenoic acids [DHA]
• CPC Class Codes: C12P 7/6472 containing polyunsaturated fatty acid [PUFA] residues, i.e. having two or more double bonds in their backbone
• CPC Class Codes: C12Y 114/19004 DELTA8-fatty-acid desaturase (1.14.19.4)
• CPC Class Codes: Y02P 20/52 using catalysts, e.g. selective catalysts

Abstract

The present invention relates to methods of synthesizing long-chain polyunsaturated fatty acids, especially eicosapentaenoic acid, docosapentaenoic acid and docosahexaenoic acid, in recombinant cells such as yeast or plant cells. Also provided are recombinant cells or plants which produce long-chain polyunsaturated fatty acids. Furthermore, the present invention relates to a group of new enzymes which possess desatorase or elongase activity that can be used in methods of synthesizing long-chain polyunsaturated fatty acids.

Claims

1-221. -221. (canceled)

222. A cell comprising eicosatetraenoic acid in an esterified form as part of triacylglycerols in the cell and an exogenous polypeptide having Δ

8 desaturase activity, wherein the exogenous polypeptide has greater activity in desaturating Δ

8 substrates than other substrates and has little or no Δ

6 desaturase activity when expressed in yeast cells.

223. The cell of claim 222, wherein the exogenous polypeptide comprises an amino acid sequence that is at least 90% identical to the amino acid sequence set forth as SEQ ID NO:

1.

224. The cell of claim 222, wherein at least 50% of the eicosatetraenoic acid in the cell is incorporated into triacylglycerols.

225. The cell of claim 222, further comprising docosahexaenoic acid in an esterified form as part of triacylglycerols in the cell, wherein at least 50% of the docosahexaenoic acid in the cell is incorporated into triacylglycerols.

226. The cell of claim 222, wherein the total fatty acid content in the cell comprises 2.5% (w/w) C20 ω

3 long-chain polyunsaturated fatty acids (LC-PUFAs) and 0.1% (w/w) docosapentaenoic acid.

227. The cell of claim 226, wherein the total fatty acid content in the cell comprises 0.13% (w/w) docosapentaenoic acid.

228. The cell of claim 227, wherein the total fatty acid content in the cell comprises 0.5% (w/w) docosapentaenoic acid.

229. The cell of claim 223, wherein the amino acid sequence of the exogenous polypeptide is identical to the amino acid sequence set forth as SEQ ID NO:

1.

230. The cell of claim 223, wherein the amino acid sequence of the exogenous polypeptide is at least 95% identical to the amino acid sequence set forth as SEQ ID NO:

1.

231. The cell of claim 223, wherein the amino acid sequence of the exogenous polypeptide is at least 99% identical to the amino acid sequence set forth as SEQ ID NO:

1.

232. A process of producing oil comprising

i) obtaining the cell of claim 222, and

ii) extracting oil from the cell.

233. The process of claim 232, wherein the cell is a plant cell.