Production of steviol glycosides in microorganisms
First Claim
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1. A recombinant host cell capable of producing steviol, a target steviol glycoside or a target steviol glycoside composition, comprising:
- (a) a gene encoding a polypeptide capable of beta 1,2 glycosylation of the C2′
of the 13-O-glucose, 19-O-glucose, or both 13-O-glucose and 19-O-glucose of a precursor steviol glycoside and having at least 95% sequence identity to the amino acid sequence set forth in SEQ ID NO;
5;
wherein the polypeptide is capable of transferring a sugar moiety to the C2′
of a glucose in the precursor steviol glycoside;
and one or more of;
(b) a gene encoding a polypeptide capable of glycosylating steviol or the precursor steviol glycoside at its C-13 hydroxyl group; and
/or(c) a gene encoding a polypeptide capable of beta 1,3 glycosylation of the C3′
of the 13-O-glucose of the precursor steviol glycoside; and
/or(d) a gene encoding a polypeptide capable of glycosylating steviol or the precursor steviol glycoside at its C-19 carboxyl group;
wherein at least one of the genes is a recombinant gene.
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Abstract
Recombinant microorganisms, plants, and plant cells are disclosed that have been engineered to express novel recombinant genes encoding steviol biosynthetic enzymes and UDP-glycosyltransferases (UGTs). Such microorganisms, plants, or plant cells can produce steviol or steviol glycosides, e.g., rubusoside or Rebaudioside A, which can be used as natural sweeteners in food products and dietary supplements.
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22 Claims
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1. A recombinant host cell capable of producing steviol, a target steviol glycoside or a target steviol glycoside composition, comprising:
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(a) a gene encoding a polypeptide capable of beta 1,2 glycosylation of the C2′
of the 13-O-glucose, 19-O-glucose, or both 13-O-glucose and 19-O-glucose of a precursor steviol glycoside and having at least 95% sequence identity to the amino acid sequence set forth in SEQ ID NO;
5;wherein the polypeptide is capable of transferring a sugar moiety to the C2′
of a glucose in the precursor steviol glycoside;and one or more of; (b) a gene encoding a polypeptide capable of glycosylating steviol or the precursor steviol glycoside at its C-13 hydroxyl group; and
/or(c) a gene encoding a polypeptide capable of beta 1,3 glycosylation of the C3′
of the 13-O-glucose of the precursor steviol glycoside; and
/or(d) a gene encoding a polypeptide capable of glycosylating steviol or the precursor steviol glycoside at its C-19 carboxyl group; wherein at least one of the genes is a recombinant gene. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification