Preparation and uses of los-depleted outer membrane proteins of gram-negative cocci
Described herein is a method for removing toxic lipooligosaccharide (LOS) from outer membranes of Gram-negative cocci, such as Neisseria meningitidis . LOS-depleted outer membranes and LOS-depleted soluble outer membrane proteins can be prepared, which are able to elicit bactericidal antibodies against homologous strains of bacteria. Vaccines and other uses of the preparations are further described.
1. Isolated outer membranes containing less than about 0.01% by weight lipooligosaccharide, produced by a method comprising:
a) extracting total membranes of a Gram-negative coccus with a polyoxyethylene detergent to produce outer membranes depleted of inner membranes; and
b) extracting the outer membranes produced by step a) with a zwitterionic betaine detergent to produce an insoluble fraction containing outer membranes containing less than about 0.01% by weight lipooligosaccharide and a soluble fraction containing lipooligosaccharide; and
c) recovering the outer membranes from the insoluble fraction produced by step b).
2. Isolated outer membranes of claim 1 , wherein the coccus is Neisseria.
3. Isolated outer membranes of claim 2 , wherein the coccus is selected from the group consisting of Neisseria meningitidis and Neisseria gonorrhoeae.
4. Isolated outer membranes of claim 1 , wherein the coccus is Moraxella.
5. Isolated outer membranes of claim 4 , wherein the coccus is Moraxella catarrhalis.
6. Isolated outer membranes of claim 1 , wherein the polyoxyethylene detergent is selected from the group consisting of:
a) nonaethylene glycol octylphenol ether;
b) polyoxyethylene(23) lauryl ether; and
c) polyoxyethylene sorbitan monooleate.
7. Isolated outer membranes of claim 1 , wherein the zwitterionic betaine detergent has the formula:
where R 1 is an alkyl chain with greater than 10 carbons and less than or equal to 16 carbons, R 2 is a carboxyl group or a sulfonyl group, and n is greater than 1.
8. Isolated outer membranes of claim 7 , wherein the zwitterionic betaine detergent is selected from the group consisting of:
a) R 2 =a sulfonyl group, n=3 and R 1 is a C12 alkyl group;
b) R 2 =a sulfonyl group, n=3 and R 1 is a C14 alkyl group; and
c) R 2 =a carboxyl group, n=2 and R 1 is a C12 alkyl group.
9. Isolated outer membranes of claim 1 , wherein step a) of the method is performed more than once before proceeding with step b).
10. Isolated outer membranes of claim 1 , wherein step b) of the method is performed more than once.
11. Isolated soluble outer membrane proteins containing less than about 0.01% by weight lipooligosaccharide, produced by a method comprising:
a) extracting total membranes of a Gram-negative coccus with a polyoxyethylene detergent to produce outer membranes depleted of inner membranes;
b) extracting the outer membranes produced by step a) with a zwitterionic betaine detergent to produce an insoluble fraction containing outer membranes containing less than about 0.01% by weight lipooligosaccharide and a soluble fraction containing lipooligosaccharide;
c) extracting the insoluble fraction containing outer membranes produced by step b) with a zwitterionic betaine detergent in salt buffer to produce a fraction containing soluble outer membrane proteins and a fraction containing insoluble outer membrane proteins and cell wall components; and
d) isolating the soluble outer membrane proteins.
12. Isolated soluble outer membrane proteins of claim 11 , wherein the coccus is Neisseria.
13. Isolated soluble outer membrane proteins of claim 12 , wherein the coccus is selected from the group consisting of Neisseria meningitidis and Neisseria gonorrhoeae.
14. Isolated soluble outer membrane proteins of claim 11 , wherein the coccus is Moraxella.
15. Isolated soluble outer membrane proteins of claim 14 , wherein the coccus is Moraxella catarrhalis.
16. Isolated soluble outer membrane proteins of claim 11 , wherein the polyoxyethylene detergent is selected from the group consisting of:
a) nonaethylene glycol octylphenol ether;
b) polyoxyethylene(23) lauryl ether; and
c) polyoxyethylene sorbitan monooleate.
17. Isolated soluble outer membrane proteins of claim 11 , wherein the zwitterionic betaine detergent has the formula:
where R 1 is an alkyl chain with greater than 10 carbons and less than or equal to 16 carbons, R 2 is a carboxyl group or a sulfonyl group, and n is greater than 1.
18. Isolated soluble outer membrane proteins of claim 17 , wherein the zwitterionic betaine detergent is selected from the group consisting of:
a) R 2 =a sulfonyl group, n=3 and R 1 is a C12 alkyl group;
b) R 2 =a sulfonyl group, n=3 and R 1 is a C14 alkyl group; and
c) R 2 =a carboxyl group, n=2 and R 1 is a C12 alkyl group.
19. Isolated soluble outer membrane proteins of claim 11 , wherein the zwitterionic betaine detergent of step (c) has the following formula:
wherein R 2 is a sulfonyl group, n is 3 and R 1 is a C14 alkyl group, and
wherein the salt buffer is about 0.1 M to about 0.5 M NaCl.
20. Isolated soluble outer membrane proteins of claim 11 , wherein the method further comprises concentrating the soluble outer membrane proteins.
21. Isolated insoluble outer membrane proteins and cell wall components containing less than about 0.01% by weight lipooligosaccharide, produced by a method comprising:
a) extracting total membranes of a Gram-negative coccus with a polyoxyethylene detergent to produce outer membranes depleted of inner membranes;
b) extracting the outer membranes produced by step a) with a zwitterionic betaine detergent to produce an insoluble fraction containing outer membranes containing less than about 0.01% by weight lipooligosaccharide and a soluble fraction containing lipooligosaccharide;
c) extracting the insoluble fraction containing outer membranes produced by step b) with a zwitterionic betaine detergent in salt buffer to produce a fraction containing soluble outer membrane proteins and a fraction containing insoluble outer membrane proteins and cell wall components; and
d) isolating the insoluble outer membrane proteins and cell wall components.
22. Isolated insoluble outer membrane proteins and cell wall components of claim 21 , wherein the coccus is Neisseria.
23. Isolated insoluble outer membrane proteins and cell wall components of claim 22 , wherein the coccus is selected from the group consisting of Neisseria meningitidis and Neisseria gonorrhoeae.
24. Isolated insoluble outer membrane proteins and cell wall components of claim 21 , wherein the coccus is Moraxella.
25. Isolated insoluble outer membrane proteins and cell wall components of claim 24 , wherein the coccus is Moraxella catarrhalis.
26. Isolated insoluble outer membrane proteins and cell wall components of claim 21 , wherein the polyoxyethylene detergent is selected from the group consisting of:
a) nonaethylene glycol octylphenol ether;
b) polyoxyethylene(23) lauryl ether; and
c) polyoxyethylene sorbitan monooleate.
27. Isolated insoluble outer membrane proteins and cell wall components of claim 21 , wherein the zwitterionic betaine detergent has the formula:
where R 1 is an alkyl chain with greater than 10 carbons and less than or equal to 16 carbons, R 2 is a carboxyl group or a sulfonyl group, and n is greater than 1.
28. Isolated insoluble outer membrane proteins and cell wall components of claim 27 , wherein the zwitterionic betaine detergent is selected from the group consisting of:
a)R 2 =a sulfonyl group, n=3 and R 1 is a C12 alkyl group;
b)R 2 =a sulfonyl group, n=3 and R 1 is a C14 alkyl group; and
c)R 2 =a carboxyl group, n=2 and R 1 is a C12 alkyl group.
29. Isolated insoluble outer membrane proteins and cell wall components of claim 21 , wherein the zwitterionic betaine detergent of step (c) has the following formula:
wherein R 2 is a sulfonyl group, n is 3 and R 1 is a C14 alkyl group, and
wherein the salt buffer is about 0.1 M to about 0.5 M NaCl.