Glycolipopeptide biosurfactants

Patent metadata

Field	Value
Publication number	US-11608352-B2
Application number	US-202016817193-A
Country	US
Kind code	B2
Filing date	Mar 12, 2020
Priority date	Apr 6, 2016
Publication date	Mar 21, 2023
Grant date	Mar 21, 2023

Abstract

Surfactants based on a newly discovered class of compounds include a hydrophobic lipid oligomer covalently linked to a peptide or peptide-like chain and a carbohydrate moiety, and a serine-leucinol dipeptide linked to the lipid oligomer. Such surfactants can be used to create an oil-in-water or water-in-oil emulsion by mixing together a polar component; a non-polar component; and the surfactant. Biosurfactants of the newly discovered class can be made by isolating and culturing a microorganism which produces the biosurfactant, and then isolating the biosurfactant from the culture. A microorganism can be engineered to produce biosurfactant of this newly discovered class by expressing a set of heterologous genes involved in the biosynthesis of the biosurfactant in the microorganism.

First claim

What is claimed:

1. A method of preparing biosurfactants containing rhamnose moieties, comprising adding at least one rhamnose moiety to a biosurfactant with recombinantly expressed RIpE,
wherein the RIpE is a rhamnosyltransferase enzyme which catalyses a rhamnosylation reaction between the rhamnose moiety and the biosurfactant,
wherein the biosurfactant comprises a hydrophobic lipid component comprising a hydroxyl end, wherein the lipid component is covalently linked to a carbohydrate moiety comprising at least one rhamnose moiety at the hydroxyl end of the lipid component attached via a glycosidic linkage, and
wherein the RIpE has an amino acid sequence identity of at least 95% with SEQ ID NO: 12 or an amino acid sequence identity of at least 95% with SEQ ID NO: 24.

2. The method of claim 1 , wherein the hydrophobic lipid component further comprises a carboxyl end, wherein the lipid component is further covalently linked to a peptide chain at the carboxyl end of the lipid component.

3. The method of claim 2 , wherein the peptide chain comprises in a range of between 2 and 10 amino acids.

4. The method of claim 1 , wherein the lipid component comprises in a range of between 1 and 6 alkanoic acid moieties.

5. The method of claim 1 wherein the lipid component comprises an acyl chain, and wherein the length of each said acyl chain is in a range of between C 4 to C 20 .

6. The method of claim 1 , wherein the carbohydrate moiety may comprise at least one acetyl group.

7. The method of claim 2 , wherein the peptide chain comprises a serine-leucinol dipeptide.

8. The method of claim 2 , wherein the lipid component comprises three β-hydroxyalkanoic acid moieties.

9. The method of claim 5 , wherein the length of each acyl chain of the lipid component is C 10 .

10. The method of claim 1 , wherein the carbohydrate moiety comprises one rhamnose moiety attached to the lipid component via a glycosidic linkage.

11. The method of claim 1 , wherein the carbohydrate moiety comprises two rhamnose moieties attached to the lipid component via a glycosidic linkage.

12. The method of claim 1 , wherein the lipid component comprises three β-hydroxyalkanoic acid moieties, the length of each acyl chain of the lipid component is C 10 , and the carbohydrate moiety comprises a rhamnose moiety attached to the lipid component via a glycosidic linkage.

13. The method of claim 2 , wherein the biosurfactant comprises the structure:

wherein R 1a is selected from the group consisting of H, OH, OCH 3 , SH, S(CH 3 ), NH 2 , NH(CH 3 ), N(CH 3 ) 2 , and a peptide chain having the structure:

wherein R 1b , R 1c , and R 1d , are selected from the group consisting of H, OH, OCH 3 , SH, S(CH 3 ), NH 2 , NH(CH 3 ), and N(CH 3 ) 2 ;
R 2a , R 2b , R 2c , and R 2d are each independently an amino acid side chain;
X 1a , X 1b , X 1c , and X 1d are each independently selected from the group consisting of one oxygen atom and two hydrogen atoms;
X 2a , X 2b , X 2c , and X 2d are each independently selected from the group consisting of NH, N(CH 3 ), and O;
R 3a is selected from the group consisting of a carbohydrate portion, and a lipid selected from the group consisting of a monomer having the structure:

and an oligomer selected from the group consisting of:

wherein X 3a , X 3b , X 3c , and X 3d are each independently selected from the group consisting of NH, N(CH 3 ), and O;
R 3a , R 3b , R 3c , and R 3d comprises a carbohydrate portion comprising a monomer selected from the group consisting of:

wherein R 5a , R 6a , R 7a , and R 8a are each independently selected from the group consisting of a hydrogen atom, methyl, acetyl, and a carbohydrate; and
R 4a , R 4b , R 4c , and R 4d are each independently selected from the group consisting of a hydrogen atom, methyl, and a C 2 to C 19 saturated or unsaturated linear, branched-chain, cyclic, or aromatic hydrocarbon groups.

14. The method of claim 13 , wherein at least one of R 6a , R 7a , and R 8a comprises a carbohydrate comprising a monomer selected from the group consisting of:

wherein R 5b , R 6b , R 7b , and R 8b are each independently selected from the group consisting of a hydrogen atom, methyl, acetyl, and a carbohydrate.

15. The method of claim 13 , wherein the peptide chain comprises at least one proline monomer having the structure:

wherein X 4 is selected from the group consisting of one oxygen atom and two hydrogen atoms.

16. The method of claim 13 , wherein the peptide chain comprises a single proline monomer or a terminal proline monomer having the structure:

wherein
R 9 is selected from the group consisting of H, OH, OCH 3 , SH, S(CH 3 ), NH 2 , NH(CH 3 ), and N(CH 3 ) 2 ; and
X 4 is selected from the group consisting of one oxygen atom and two hydrogen atoms.

17. The method of claim 1 , wherein the biosurfactant has the structure:

wherein
R 5a , R 6a , R 7a , R 10 , and R 11 are each independently selected from the group consisting of a hydrogen atom and acetyl; and
n 1 , n 2 , and n 3 are integers each independently selected from 1 to 7.

18. The method of claim 1 , wherein the biosurfactant has the structure:

wherein
R 5a , R 5b , R 6b , R 7a , R 7b , R 10 , and R 11 are each independently selected from the group consisting of a hydrogen atom and acetyl; and
n 1 , n 2 , and n 3 are integers each independently selected from 1 to 7.

19. The method of claim 1 , wherein the biosurfactant has the structure:

20. The method of claim 1 , wherein the biosurfactant has the structure:

21. The method of claim 1 , wherein the biosurfactant has the structure:

22. The method of claim 1 , which includes adding one to four rhamnose moieties to the biosurfactant.

23. The method of claim 1 , wherein the RIpE adds said at least one rhamnose moiety to the biosurfactant via dTDP-L-rhamnose.

Assignees

• Croda Int Plc

Inventors

• Kerr Russell Greig
• Haltli Bradley Arnold
• Marchbank Douglas Hubert
• Berruè Fabrice

Classifications

• C07H15/04 Primary

  attached to an oxygen atom of the saccharide radical · CPC title

• C12N1/205

  Bacterial isolates · CPC title

• C11D1/662

  Carbohydrates or derivatives · CPC title

• C12P19/44

  Preparation of O-glycosides, e.g. glucosides {(polysaccharides and not substituted disaccharides C12P19/04, C12P19/12)} · CPC title

• C11D3/381

  Microorganisms · CPC title