Method of isolating a target cell
The invention provides new methods of isolating target cells using a solid phase, the solid phase comprising a ligand L wherein the ligand L is capable of specifically binding a ligand binding partner LB, the ligand binding partner LB being present in a receptor molecule binding reagent or a multimerization reagent used for isolating target cells. The invention also provides corresponding new arrangements and devices for isolating a target cell from a sample.
1. A method of isolating a target cell, wherein the target cell is a mammalian cell comprising a receptor molecule on the target cell surface, the method comprising:
contacting
i) a receptor molecule binding reagent, the receptor molecule binding reagent comprising a binding site B and a binding partner C, wherein the binding site B comprised in the receptor molecule binding reagent is capable of specifically binding to the receptor molecule on the target cell surface and is selected from the group consisting of an antibody, a divalent antibody fragment, and a monovalent antibody fragment, and
wherein the binding partner C comprised in the receptor molecule binding reagent is capable of reversibly binding to a binding site Z on a multimerization reagent,
ii) a multimerization reagent,
wherein the multimerization reagent is soluble and present in solution, and comprises two or more binding sites Z capable of reversibly binding to the binding partner C comprised in the receptor molecule binding reagent,
wherein the multimerization reagent further comprises a ligand binding partner LB, the ligand binding partner LB being capable of specifically binding a ligand L,
and
iii) a sample, the sample comprising the target cell, thereby allowing the receptor molecule binding reagent, the multimerization reagent and the target cell to form a multivalent binding complex comprising the target cell bound to two or more receptor molecule binding reagents that are bound to the multimerization reagent,
contacting the multivalent binding complex of target cell, receptor molecule binding reagent and multimerization reagent with a solid phase chromatography matrix, the solid phase chromatography matrix comprising the ligand L, wherein the solid phase chromatography matrix is a non-magnetic material or non-magnetisable material,
thereby allowing reversible immobilization of the target cell on the solid phase chromatography matrix via the binding between the ligand L and the ligand binding partner LB, wherein immobilization of the target cell on the solid phase chromatography matrix is reversible upon disruption of at least the binding between the binding partner C comprised in the receptor molecule binding reagent and the binding site Z of the multimerization reagent.
2. The method of claim 1 , wherein the receptor molecule binding reagent and the multimerization reagent are contacted with each other to form a complex comprising two or more receptor molecule binding reagents bound to the multimerization reagent prior to contacting (incubating) this complex with the target cell.
3. The method of claim 1 , wherein the dissociation constant (K d ) for the binding between the receptor molecule binding reagent and the receptor molecule is of low affinity.
4. The method of claim 3 , wherein the dissociation constant (K d ) for the binding between said receptor molecule binding reagent and said receptor molecule is in the range of about 10 −3 M to about 10 −10 M, or about 10 −3 M to about 10 −9 M, or about 10 −3 M to about 10 −8 M, or about 10 −3 M to about 10 −7 M.
5. The method of claim 4 , further comprising collecting the target cell released from the solid phase chromatography matrix.
6. The method of claim 1 , wherein the dissociation constant (K d ) for the binding between said receptor molecule binding reagent and said receptor molecule is in the range of about 10 −2 to about 10 −10 M.
7. The method of claim 1 , wherein the reversible bond formed between the partner C comprised in the receptor molecule binding reagent and the binding site Z of the multimerization reagent is displaceable (disruptable) under competitive conditions.
8. The method of claim 7 , comprising contacting the solid phase chromatography matrix with a competition reagent, the competition reagent being capable of disrupting the reversible bond formed between the binding partner C and the binding site Z, thereby disrupting the target cell/multivalent binding complex and allowing releasing the target cell (by elution) from the solid phase chromatography matrix.
9. The method of claim 1 , wherein the bond formed between the ligand binding partner LB comprised in the multimerization reagent and the ligand L comprised on the solid phase chromatography matrix is displaceable (disruptable).
10. The method of claim 9 , wherein the bond formed between the ligand binding partner LB and the ligand L is displaceable (disruptable) under competitive conditions.
11. The method of claim 10 , comprising contacting the solid phase chromatography matrix with a competition reagent, the competition reagent being capable of displacing (disrupting) the bond formed between the ligand binding partner LB and the ligand L, thereby releasing the target cell from the solid phase chromatography matrix.
12. The method of claim 1 , wherein the reversible bond formed between the partner C comprised in the receptor molecule binding reagent and the binding site Z of the multimerization reagent and the reversible bond formed between the ligand binding partner LB comprised in the multimerization reagent and the ligand L comprised on the solid phase chromatography matrix is displaceable (disruptable) under competitive conditions, and wherein the same competition reagent is used for disrupting the reversible bond formed between the binding partner C and the binding site Z and for disrupting the bond formed between the ligand binding partner LB and the ligand L.
13. The method of claim 1 , wherein the reversible bond between the binding partner C comprised in the receptor molecule binding reagent and the binding site Z of the multimerization reagent has a K d between about 10 −5 and about 10 −13 M.
14. The method of claim 1 , wherein the binding partner C and the binding site Z form a binding pair selected from the group of
streptavidin or a streptavidin analog and a ligand binding to streptavidin,
a binding pair that binds in the presence of a divalent cation,
an oligohistidine peptide and a binding moiety A comprising at least two chelating groups K, wherein each chelating group K is capable of binding to a transition metal ion, thereby rendering binding moiety A capable of binding to the oligohistidine peptide,
an antigen and an antibody against said antigen, wherein said binding partner C comprises the antigen and said multimerization reagent comprises the antibody against said antigen.
15. The method of claim 14 , wherein
(a) said binding partner C comprises biotin and said multimerization reagent comprises a streptavidin analog or an avidin analog that reversibly binds to biotin,
(b) said binding partner C comprises a biotin analog that reversibly binds to streptavidin or avidin and said multimerisation reagent comprises streptavidin, or avidin, or a streptavidin analog, or an avidin analog that reversibly binds to said biotin analog, or
(c) said binding partner C comprises a streptavidin or avidin binding peptide and said multimerization reagent comprises streptavidin, or avidin, or a streptavidin analog, or an avidin analog that reversibly binds to said streptavidin or avidin binding peptide.
16. The method of claim 15 , wherein said multimerization reagent comprises a streptavidin mutein comprising the amino acid sequence Val 44 -Thr 45 -Ala 46 -Arg 47 (SEQ ID NO: 19) at sequence positions 44 to 47 of wild-type streptavidin or a streptavidin mutein comprising the amino acid sequence Ile 44 -Gly 45 -Ala 46 -Arg 47 (SEQ ID NO: 20) at sequence positions 44 to 47 of wild-type streptavidin and wherein said binding partner C comprises the streptavidin-binding peptide that comprises or consists of one of the following sequences:
a) -Trp-Xaa-His-Pro-Gln-Phe-Yaa-Zaa- (SEQ ID NO: 1), wherein Xaa is any amino acid and Yaa and Zaa are both Gly or Yaa is Glu and Zaa is Lys or Arg,
b) -Trp-Arg-His-Pro-Gln-Phe-Gly-Gly- (SEQ ID NO: 2),
c) -Trp-Ser-His-Pro-Gln-Phe-Glu-Lys- (SEQ ID NO: 3),
d) a sequential arrangement of at least two streptavidin binding peptides, wherein each peptide binds streptavidin, wherein the distance between two peptides is at least 0 and not greater than 50 amino acids and wherein each of the at least two peptides comprises the amino acid sequence -His-Pro-Baa- in which Baa is selected from the group consisting of glutamine, asparagine and methionine,
e) a sequential arrangement as recited in d), wherein one of the at least two peptides comprises the sequence -His-Pro-Gln-,
f) a sequential arrangement as recited in d), wherein one of the peptides comprises an amino acid sequence -His-Pro-Gln-Phe- (SEQ ID NO: 4),
g) a sequential arrangement as recited in d) wherein at least one peptide includes at least the amino sequence -Oaa-Xaa-His-Pro-Gln-Phe-Yaa-Zaa- (SEQ ID NO: 5), where Oaa is Trp, Lys or Arg, Xaa is any amino acid and where either Yaa and Zaa are both Gly or Yaa is Glu and Zaa is Lys or Arg,
h) a sequential arrangement as recited in d) wherein at least one peptide includes at least the amino acid sequence -Trp-Xaa-His-Pro-Gln-Phe-Yaa-Zaa- (SEQ ID NO: 6) where Xaa is any amino acid and where either Yaa and Zaa are both Gly or Yaa is Glu and Zaa is Lys or Arg,
i) a sequential arrangement as recited in d) wherein at least one peptide includes at least the amino acid sequence -Trp-Ser-His-Pro-Gln-Phe-Glu-Lys- (SEQ ID NO: 7),
j) the amino acid sequence -Trp-Ser-His-Pro-Gln-Phe-Glu-Lys- (Xaa)n-Trp-Ser-His-Pro-Gln-Phe-Glu-Lys- (SEQ ID NO: 8) wherein Xaa is any amino acid and n is an integer from 0 to 12,
k) an amino acid sequence selected from the group consisting of Trp-Arg-His-Pro-Gln-Phe-Gly-Gly (SEQ ID NO: 9), Trp-Ser-His-Pro-Gln-Phe-Glu-Lys (SEQ ID NO: 10), Trp-Ser-His-Pro-Gln-Phe-Glu-Lys-(GlyGlyGlySer) 3 -Trp-Ser-His-Pro-Gln-Phe-Glu-Lys (SEQ ID NO: 11), Trp-Ser-His-Pro-Gln-Phe-Glu-Lys-(GlyGlyGlySer) 2 -Trp-Ser-His-Pro-Gln-Phe-Glu-Lys (SEQ ID NO: 12) or Trp-Ser-His-Pro-Gln-Phe-Glu-Lys-(GlyGlyGlySer) 2 -Gly-Gly-Ser-Ala-Trp-Ser-His-Pro-Gln-Phe-Glu-Lys (SEQ ID NO: 13).
17. The method of claim 1 , wherein the target cell is selected from the group consisting of a stem cell, a lymphocyte and a cancer cell.
18. A method of isolating a target cell, wherein the target cell is a mammalian cell comprising a receptor molecule on the target cell surface, the method comprising:
contacting
i) a receptor molecule binding reagent,
the receptor molecule binding reagent comprising a binding site B and a binding partner C, wherein the binding site B comprised in the receptor molecule binding reagent is capable of specifically binding to the receptor molecule on the target cell surface and is selected from the group consisting of an antibody, a divalent antibody fragment, and a monovalent antibody fragment,
wherein the binding partner C comprised in the receptor molecule binding reagent is capable of reversibly binding to a binding site Z on a multimerization reagent, and
wherein the receptor molecule binding reagent further comprises a ligand binding partner LB, the ligand binding partner LB being capable of specifically binding a ligand L,
and
ii) a multimerization reagent,
wherein the multimerization reagent is soluble and present in solution, and comprises two or more binding sites Z capable of reversibly binding to the binding partner C comprised in the receptor molecule binding reagent,
iii) a sample, the sample comprising the target cell,
thereby allowing the receptor molecule binding reagent, the multimerization reagent and the target cell to form a multivalent binding complex comprising the target cell bound to two or more receptor molecule binding reagents that are bound to the multimerization reagent,
contacting the multivalent binding complex of target cell, receptor molecule binding reagent and multimerization reagent with a solid phase chromatography matrix, the solid phase chromatography matrix comprising the ligand L, wherein the solid phase chromatography matrix is a non-magnetic material or non-magnetisable material,
thereby allowing reversible immobilization of the target cell on the solid phase chromatography matrix via the binding between the ligand L and the ligand binding partner LB, wherein immobilization of the target cell on the solid phase chromatography matrix is reversible upon disruption of
a) the binding between the binding partner C comprised in the receptor molecule binding reagent and the binding site Z of the multimerization reagent and/or
b) the binding between the ligand L of the solid phase chromatography matrix and the ligand binding partner LB comprised in the receptor molecule binding reagent.
19. A method of immobilizing a target cell on a solid phase chromatography matrix, wherein the target cell is a mammalian cell comprising a receptor molecule on the target cell surface, the method comprising:
contacting
i) a receptor molecule binding reagent,
the receptor molecule binding reagent comprising a binding site B and a binding partner C, wherein the binding site B comprised in the receptor molecule binding reagent is capable of specifically binding to the receptor molecule on the target cell surface and is selected from the group consisting of an antibody, a divalent antibody fragment, and a monovalent antibody fragment, and
wherein the binding partner C comprised in the receptor molecule binding reagent is capable of reversibly binding to a binding site Z on a multimerization reagent,
ii) a multimerization reagent,
wherein the multimerization reagent is soluble and present in solution, and comprises two or more binding sites Z capable of reversibly binding to the binding partner C comprised in the receptor molecule binding reagent,
wherein the multimerization reagent further comprises a ligand binding partner LB, the ligand binding partner LB being capable of specifically binding a ligand L,
and
ii) a sample, the sample comprising the target cell,
thereby allowing the receptor molecule binding reagent, the multimerization reagent and the target cell to form a multivalent binding complex comprising the target cell bound to two or more receptor molecule binding reagents that are bound to the multimerization reagent,
contacting the multivalent binding complex of target cell, receptor molecule binding reagent and multimerization reagent with a solid phase chromatography matrix, the solid phase chromatography matrix comprising the ligand L, wherein the solid phase chromatography matrix is a non-magnetic material or non-magnetisable material,
thereby allowing reversible immobilization of the target cell on the solid phase chromatography matrix via the binding between the ligand L and the ligand binding partner LB, wherein immobilization of the target cell on the solid phase chromatography matrix is reversible upon disruption of at least the binding between the binding partner C comprised in the receptor molecule binding reagent and the binding site Z of the multimerization reagent.
20. A method of immobilising a target cell on a solid phase chromatography matrix, wherein the target cell has a receptor molecule on the target cell surface, the method comprising:
contacting
i) a receptor molecule binding reagent,
the receptor molecule binding reagent comprising a binding site B and a binding partner C, wherein the binding site B comprised in the receptor molecule binding reagent is capable of specifically binding to the receptor molecule on the target cell surface and is selected from the group consisting of an antibody, a divalent antibody fragment, and a monovalent antibody fragment,
wherein the binding partner C comprised in the receptor molecule binding reagent is capable of reversibly binding to a binding site Z on a multimerization reagent, and
wherein the receptor molecule binding reagent further comprises a ligand binding partner LB, the ligand binding partner LB being capable of specifically binding a ligand L, and
ii) a multimerization reagent,
wherein the multimerization reagent is soluble and present in solution, and comprises two or more binding sites Z capable of reversibly binding to the binding partner C comprised in the receptor molecule binding reagent,
iii) a sample, the sample comprising the target cell,
thereby allowing the receptor molecule binding reagent, the multimerization reagent and the target cell to form a multivalent binding complex comprising the target cell bound to two or more receptor molecule binding reagents that are bound to the multimerization reagent,
contacting the multivalent binding complex of target cell, receptor molecule binding reagent and multimerization reagent with a solid phase chromatography matrix, the solid phase chromatography matrix comprising the ligand L, wherein the solid phase chromatography matrix is a non-magnetic material or non-magnetisable material,
thereby allowing reversible immobilization of the target cell on the solid phase chromatography matrix via the binding between the ligand L and the ligand binding partner LB, wherein immobilization of the target cell on the solid phase chromatography matrix is reversible upon disruption of
a) the binding between the binding partner C comprised in the receptor molecule binding reagent and the binding site Z of the multimerization reagent and/or
b) the binding between the ligand L of the solid phase chromatography matrix and the ligand binding partner LB comprised in the receptor molecule binding reagent.