PUFA polyketide synthase systems and uses thereof
First Claim
1. A genetically modified plant or plant part, wherein cells of the plant are transfected with at least one recombinant nucleic acid molecule encoding a polyketide synthase (PKS) system for the production of polyunsaturated fatty acids (PUFAs) and a phosphopantetheine transferase, wherein the PKS system comprises the following proteins:
- a) a protein comprising an amino acid sequence that is at least 95% identical to SEQ ID NO;
2 and has β
-keto acyl-ACP synthase (KS) activity, malonyl-CoA;
ACP acyltransferase (MAT) activity, acyl carrier protein (ACP) activity and ketoreductase (KR) activity, wherein the amino acid sequence comprises an aspartate at a position corresponding to amino acid 667 of SEQ ID NO;
2 and a histidine at a position corresponding to amino acid 668 of SEQ ID NO;
2;
b) a protein comprising an amino acid sequence that is at least 95% identical to SEQ ID NO;
4 and has KS activity, chain length factor (CLF) activity, acyl transferase (AT) activity, and enoyl ACP-reductase (ER) activity, wherein the amino acid sequence comprises a valine at a position corresponding to amino acid 371 of SEQ ID NO;
4 and a glutamate at a position corresponding to amino acid 1415 of SEQ ID NO;
4; and
c) a protein comprising an amino acid sequence that is at least 95% identical to SEQ ID NO;
6 and has FabA-like β
-hydroxy acyl-ACP dehydrase (DH) activity and ER activity, wherein the amino acid sequence comprises the sequence of H-G-I-A-N-P-T-F-V-H-A-P-G-K-I (positions 876-890 of SEQ ID NO;
6) at positions corresponding to amino acids 876-890 of SEQ ID NO;
6.
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Abstract
Disclosed are the complete polyunsaturated fatty acid (PUFA) polyketide synthase (PKS) systems from Schizochytrium, and biologically active fragments and homologues thereof. More particularly, this invention relates to nucleic acids encoding such PUFA PKS systems, to proteins and domains thereof that comprise such PUFA PKS systems, to genetically modified organisms (plants and microorganisms) comprising such PUFA PKS systems, and to methods of making and using the PUFA PKS systems disclosed herein. This invention also relates to genetically modified plants and microorganisms and methods to efficiently produce lipids enriched in various polyunsaturated fatty acids (PUFAs) as well as other bioactive molecules by manipulation of a PUFA polyketide synthase (PKS) system.
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Citations
20 Claims
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1. A genetically modified plant or plant part, wherein cells of the plant are transfected with at least one recombinant nucleic acid molecule encoding a polyketide synthase (PKS) system for the production of polyunsaturated fatty acids (PUFAs) and a phosphopantetheine transferase, wherein the PKS system comprises the following proteins:
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a) a protein comprising an amino acid sequence that is at least 95% identical to SEQ ID NO;
2 and has β
-keto acyl-ACP synthase (KS) activity, malonyl-CoA;
ACP acyltransferase (MAT) activity, acyl carrier protein (ACP) activity and ketoreductase (KR) activity, wherein the amino acid sequence comprises an aspartate at a position corresponding to amino acid 667 of SEQ ID NO;
2 and a histidine at a position corresponding to amino acid 668 of SEQ ID NO;
2;b) a protein comprising an amino acid sequence that is at least 95% identical to SEQ ID NO;
4 and has KS activity, chain length factor (CLF) activity, acyl transferase (AT) activity, and enoyl ACP-reductase (ER) activity, wherein the amino acid sequence comprises a valine at a position corresponding to amino acid 371 of SEQ ID NO;
4 and a glutamate at a position corresponding to amino acid 1415 of SEQ ID NO;
4; andc) a protein comprising an amino acid sequence that is at least 95% identical to SEQ ID NO;
6 and has FabA-like β
-hydroxy acyl-ACP dehydrase (DH) activity and ER activity, wherein the amino acid sequence comprises the sequence of H-G-I-A-N-P-T-F-V-H-A-P-G-K-I (positions 876-890 of SEQ ID NO;
6) at positions corresponding to amino acids 876-890 of SEQ ID NO;
6. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method to produce a genetically modified plant that has a polyunsaturated fatty acid (PUFA) profile that differs from the naturally occurring plant and that produces at least one long chain polyunsaturated fatty acid (PUFA), comprising transfecting plant cells with at least one recombinant nucleic acid molecule encoding a polyketide synthase (PKS) system for the production of polyunsaturated fatty acids (PUFAs) and a phosphopantetheine transferase, and producing the plant from the plant cells, wherein the PKS system comprises the following proteins:
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a) a protein comprising an amino acid sequence that is at least 95% identical to SEQ ID NO;
2 and has β
-keto acyl-ACP synthase (KS) activity, malonyl-CoA;
ACP acyltransferase (MAT) activity, acyl carrier protein (ACP) activity and ketoreductase (KR) activity, wherein the amino acid sequence comprises an aspartate at a position corresponding to amino acid 667 of SEQ ID NO;
2 and a histidine at a position corresponding to amino acid 668 of SEQ ID NO;
2;b) a protein comprising an amino acid sequence that is at least 95% identical to SEQ ID NO;
4 and has KS activity, chain length factor (CLF) activity, acyl transferase (AT) activity, and enoyl ACP-reductase (ER) activity, wherein the amino acid sequence comprises a valine at a position corresponding to amino acid 371 of SEQ ID NO;
4 and a glutamate at a position corresponding to amino acid 1415 of SEQ ID NO;
4; andc) a protein comprising an amino acid sequence that is at least 95% identical to SEQ ID NO;
6 and has FabA-like β
-hydroxy acyl-ACP dehydrase (DH) activity and ER activity, wherein the amino acid sequence comprises the sequence of H-G-I-A-N-P-T-F-V-H-A-P-G-K-I (positions 876-890 of SEQ ID NO;
6) at positions corresponding to amino acids 876-890 of SEQ ID NO;
6.
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16. A recombinant plant cell, wherein the plant cell expresses at least one recombinant nucleic acid molecule encoding a polyketide synthase (PKS) system for the production of polyunsaturated fatty acids (PUFAs), wherein the PKS system comprises the following proteins:
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a) a protein comprising an amino acid sequence that is at least 95% identical to SEQ ID NO;
2 and has β
-keto acyl-ACP synthase (KS) activity, malonyl-CoA;
ACP acyltransferase (MAT) activity, acyl carrier protein (ACP) activity and ketoreductase (KR) activity, wherein the amino acid sequence comprises an aspartate at a position corresponding to amino acid 667 of SEQ ID NO;
2 and a histidine at a position corresponding to amino acid 668 of SEQ ID NO;
2;b) a protein comprising an amino acid sequence that is at least 95% identical to SEQ ID NO;
4 and has KS activity, chain length factor (CLF) activity, acyl transferase (AT) activity, and enoyl ACP-reductase (ER) activity, wherein the amino acid sequence comprises a valine at a position corresponding to amino acid 371 of SEQ ID NO;
4 and a glutamate at a position corresponding to amino acid 1415 of SEQ ID NO;
4; andc) a protein comprising an amino acid sequence that is at least 95% identical to SEQ ID NO;
6 and has FabA-like β
-hydroxy acyl-ACP dehydrase (DH) activity and ER activity, wherein the amino acid sequence comprises the sequence of H-G-I-A-N-P-T-F-V-H-A-P-G-K-I (positions 876-890 of SEQ ID NO;
6) at positions corresponding to amino acids 876-890 of SEQ ID NO;
6. - View Dependent Claims (17, 18, 19, 20)
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Specification