Method of reversibly disrupting a conjugate comprising a biotin compound and a biotin-binding compound
The present invention relates to a method of disrupting a conjugate comprising a biotin compound and a biotin-binding compound, said method comprising the step of contacting said conjugate with an effective amount of a substantially aqueous solution under conditions such that the conjugate is disrupted, preferably reversibly disrupted, thereby forming a biotin compound and a biotin-binding compound. In particular, the invention relates to a method of reversibly releasing a biotinylated moiety from a streptavidin (or avidin) coated support. Uses of the methods in techniques of detection, identification, determination, purification, separation and/or isolation of target proteins or nucleic acid molecules are also encompassed by the present invention.
1. A method of reversibly disrupting a conjugate comprising a biotin compound and a biotin-binding compound, said method comprising the step of contacting said conjugate with an effective amount of a substantially aqueous solution comprising less than 100 mM sodium chloride at a temperature of from 50 to 90° C. under conditions such that the conjugate is disrupted, thereby forming a biotin compound and a biotin-binding compound, wherein the biotin-binding compound is streptavidin, avidin or a derivative or analog thereof which is capable of binding to said biotin compound.
2. The method of claim 1 wherein said conjugate comprises a biotin-avidin or biotin-streptavidin linkage.
3. The method of claim 1 , wherein said substantially aqueous solution contains at least 50% by volume of water.
4. The method of claim 1 , wherein said substantially aqueous solution is substantially free of chelating agents.
5. The method of claim 1 , wherein said substantially aqueous solution is substantially free of monovalent and/or divalent salts.
6. The method of claim 1 , wherein said substantially aqueous solution is purified or distilled water.
7. The method of claim 1 , wherein said contacting step comprises incubation of said conjugate at a temperature in the range of from about 60 to 90° C.
8. The method of claim 1 , wherein said contacting step comprises incubation of said conjugate at a temperture of about 80° C.
9. The method of claim 1 , wherein said biotin compound is bound or linked to one or more biological or chemical entity.
10. The method of claim 9 , wherein said biological entity is a nucleic acid molecule, a protein or a chimeric molecule comprising a nucleic acid or protein.
11. The method of claim 1 , wherein either the biotin or biotin-binding compound is immobilised on a solid support.
12. The method of claim 11 , wherein the biotin-binding compound is immobilised.
13. The method of claim 11 , or claim 12 wherein the solid support is particulate.
14. The method of claim 13 , wherein said solid support comprises magnetic beads.
15. The method of claim 11 , wherein the surface of said solid support is substantially hydrophilic.
16. The method of claim 11 , wherein following disruption of said conjugate the solid support is re-used one or more times.
17. The method of claim 11 , further comprising the additional step of re-conditioning the solid support so that the support can be re-used.
18. A method of reversibly releasing a biotinylated moiety from a support comprising a biotin-binding compound, said method comprising the step of eluting said support with a substantially aqueous solution comprising less than 100 mM sodium chloride at a temperature of from 50 to 90° C., whereby to effect release of said moiety, wherein the biotin-binding compound is streptavidin, avidin or a derivative or analog thereof which is capable of binding to said biotin compound.
19. A method of reversibly immobilising a biotinylated moiety, said method comprising the following steps:
(a) binding said biotinylated moiety to a support comprising a biotin-binding compound, and subsequently
(b) eluting said support with a substantially aqueous solution comprising less than 100 mN sodium chloride at a temperature of from 50 to 90° C., whereby to effect release of said biotinylated moiety, wherein the biotin-binding compound is streptavidin, avidin or a derivative or analog thereof which is capable of binding to said biotin compound.
20. The method of claim 18 or 19 wherein said substantially aqueous solution is purified or distilled water.