POLYPEPTIDES AND METHODS FOR PRODUCING TRIACYLGLYCEROLS COMPRISING MODIFIED FATTY ACIDS

• US 20110218348A1
• Filed: 04/24/2009
• Published: 09/08/2011
• Est. Priority Date: 04/25/2008
• Status: Abandoned Application

• Current Assignee: Grains Research & Development Corporation
• Original Assignee: Commonwealth Scientific & Industrial Research Organisation (Commonwealth Of Australia As Represented By Department Of Industry, Innovation, Climate Change, Science, Research And Tertiary Education), Grains Research & Development Corporation
• Inventors: Zhou, Xue-Rong, Singh, Surinder Pal, Green, Allan
• Application Number:
  US12/989,405
• Publication Number:
  US 20110218348A1
• Time in Patent Office: Days
• US Class Current: 549/513
• CPC Class Codes: A23D 9/00 Other edible oils or fats, e.g. shortenings, cooking oils
• CPC Class Codes: C12N 15/8247 involving modified lipid metabolism, e.g. seed oil composition
• CPC Class Codes: C12N 9/0004 Oxidoreductases (1.)
• CPC Class Codes: C12N 9/0071 acting on paired donors with incorporation of molecular oxygen (1.14)
• CPC Class Codes: C12N 9/1029 transferring groups other than amino-acyl groups (2.3.1)
• CPC Class Codes: C12N 9/18 Carboxylic ester hydrolases (3.1.1)
• CPC Class Codes: C12N 9/20 Triglyceride splitting, e.g. by means of lipase
• CPC Class Codes: C12P 17/02 Oxygen as only ring hetero atoms
• CPC Class Codes: C12P 7/6463 obtained from glyceride producing microorganisms, e.g. single cell oil
• CPC Class Codes: C12P 7/6472 containing polyunsaturated fatty acid [PUFA] residues, i.e. having two or more double bonds in their backbone

Abstract

The present invention relates to methods of producing modified fatty acids comprising a functional group which is a hydroxyl group, an epoxy group, an acetylenic group or a conjugated double bond. For example, seeds, seedoil and methods of making seedoil are provided wherein at least 23% (mol %) of the fatty acid content of the seed or seedoil comprises the functional group. Also provided are novel polypeptides, and polynucleotides thereof, which can be used to produce the modified fatty acids, particularly in transgenic plants and cells suitable for fermentation.

Claims

1-61. -61. (canceled)

62. A process for producing seedoil, comprising the steps of

i) obtaining a transgenic seed having one or more epoxygenated fatty acids in its seedoil such that at least 23% of the fatty acid content of the seedoil comprises an epoxy group, wherein the seed is from Brassica sp., Gossypium hirsutum, Linum usitatissimum, Helianthus sp., Carthamus tinctorius, Glycine max, Zea mays or Arabidopsis thaliana, and wherein the seedoil has one or more of

a) less than 4% (mol %) of the total fatty acid content of the seedoil is linolenic acid,

b) at least 10% (mol %) of fatty acids esterified at the sn-3 position of total triacylglycerols in the seedoil comprises the epoxy group,

c) at least 10% (mol %) of fatty acids esterified at the sn-2 position of total triacylglycerols in the seedoil comprises the epoxy group,

d) at least 10% (mol %) of fatty acids esterified at the sn-1 position of total triacylglycerols in the seedoil comprises the epoxy group,

e) at least 10% of the seedoil is bi-vernoleate, or

f) at least 4% of the seedoil is tri-vernoleate, and

ii) processing the seed to extract the seedoil.

63. The process of claim 62, wherein the method further comprises harvesting the seed, crushing the seed and/or purifying the seedoil.

64. The process of claim 62, wherein the seedoil has

a) less than 4% (mol %) of the total fatty acid content of the seedoil is linolenic acid,

b) at least 10% (mol %) of fatty acids esterified at the sn-3 position of total triacylglycerols in the seedoil comprises the epoxy group,

c) at least 10% (mol %) of fatty acids esterified at the sn-2 position of total triacylglycerols in the seedoil comprises the epoxy group,

d) at least 10% (mol %) of fatty acids esterified at the sn-1 position of total triacylglycerols in the seedoil comprises the epoxy group, and

e) at least 10% of the seedoil is bi-vernoleate.

65. The process of claim 62, wherein the fatty acids with the epoxy group are C14, C16, C18, C20, C22 or C24 fatty acids or a combination of any two or more thereof.

66. The process of claim 65, wherein the fatty acids with the epoxy group are predominantly C18 fatty acids.

67. The process of claim 66, wherein the fatty acids with the epoxy group are 12,13-epoxy derivatives of C18:

1.

68. The process of claim 62, wherein the epoxy group is between carbons 12 and 13 of an acyl chain.

69. The process of claim 62, wherein at least 28% of the fatty acid content of the seedoil comprises an epoxy group.

70. Seedoil comprising one or more epoxygenated fatty acids such that at least 28% (mol %) of the fatty acid content of the seedoil comprises an epoxy group, wherein the seedoil is from Brassica sp., Gossypium hirsutum, Linum usitatissimum, Helianthus sp., Carthamus tinctorius, Glycine max, Zea mays or Arabidopsis thaliana and wherein the seedoil has one or more of

a) less than 4% (mol %) of the total fatty acid content of the seedoil is linolenic acid,

b) at least 10% (mol %) of fatty acids esterified at the sn-3 position of total triacylglycerols in the seedoil comprises the epoxy group,

c) at least 10% (mol %) of fatty acids esterified at the sn-2 position of total triacylglycerols in the seedoil comprises the epoxy group,

d) at least 10% (mol %) of fatty acids esterified at the sn-1 position of total triacylglycerols in the seedoil comprises the epoxy group,

e) at least 10% of the seedoil is bi-vernoleate, or

f) at least 4% of the seedoil is tri-vernoleate.