Method for identifying and for extracting endotoxin
The invention relates to a method for identifying endotoxins for eliminating said endotoxins from a sample, with the aid of bacteriophage tail proteins.
1. A method for detecting endotoxin, comprising the steps:
a) incubating a sample in the presence of divalent cations with an isolated p12 bacteriophage tail protein, and
b) detecting endotoxin bonded to said bacteriophage tail protein.
2. The method according to claim 1 , further comprising after step a) and prior to step b) the additional step of:
a′) separating a p12 bacteriophage tail protein-endotoxin complex from the sample.
3. The method according to claim 1 , wherein detection comprises spectroscopic methods.
4. A method for removing endotoxin from a sample, comprising the steps:
a) incubating a sample with or bringing a sample in contact with divalent cations and an isolated p12 bacteriophage tail protein, said p12 bacteriophage tail protein being immobilized on a permanent carrier, non-specifically or directly,
b) separating p12 bacteriophage tail protein-endotoxin complex from the sample wherein the permanent carrier comprises filtration media, glass particles, magnetic particles, agarose particles, sedimentation materials or filling materials for chromatography columns.
5. The method according to claim 4 , wherein steps a) and b) are implemented in a chromatography column flowthrough method.
6. The method according to claim 4 , the p12 bacteriophage tail proteins being immobilised on the permanent carrier via coupling groups.
7. The method according to claim 6 , the coupling group being a lectin, receptor or anticalin.
8. The method according to claim 6 , wherein the coupling group comprises streptavidin or avidin and the p12 bacteriophage tail proteins are coupled with biotin or a Strep-tag.
9. The method according to claim 4 , the p12 bacteriophage tail proteins are immobilised on the permanent carrier covalently via chemical bonds.
10. The method according to claim 1 , wherein the p12 bacteriophage tail protein further comprises a Strep-tag or a His-tag.
11. The method according to claim 10 , wherein the tag comprises an amino acid sequence according to SEQ ID NO. 5, 6, or 7.
12. The method according to claim 1 , wherein the p12 bacteriophage tail protein is p12 protein of phage T4 and further comprises a Strep-tag or a His-tag.
13. The method according to claim 1 , wherein the divalent cations are Ca 2+ in the range of 0.1 μM to 10 mM.
14. The method according to claim 1 , wherein detecting comprises detecting displacement of a prebound fluorescence-marked endotoxin from said p12 bacteriophage tail protein of a).
15. The method according to claim 4 , wherein the p12 bacteriophage tail protein further comprises a Strep-tag or a His-tag.
16. The method according to claim 15 , wherein the tag comprises an amino acid sequence according to SEQ ID NO. 5, 6 or 7.
17. The method according to claim 4 , wherein the p12 bacteriophage tail protein is p12 protein of phage T4 and further comprises a Strep-tag or a His-tag.