Potent T cell modulating molecules
The present invention relates to a polypeptide construct comprising at least one CDR3 region, wherein at least one of the at least CDR3 regions comprises at least one substitution in the amino acid sequence YYDDHY (SEQ ID NO.1) and wherein the at least one substitution comprises: in the first position of SEQ ID NO.1 a substitution from Y to H; in the second position of SEQ ID NO. 1 a substitution from Y to S, from Y to N, from Y to F or from Y to H; in third position of SEQ ID NO. 1 a substitution from D to N or from D to E; in the forth position of SEQ ID NO. 1 a substitution from D to Q, from D to A, from D to V, from D to E or from D to G; in the fifth position of SEQ ID NO. 1 a substitution from H to Q, from H to P, from H to Y, from H to R or from H to N; or in the sixth position a substitution from Y to N.
1. A polypeptide construct comprising the CDR-1, CDR-2, CDR-3 regions of V L , as well as the CDR-1, CDR-2, CDR-3 regions of V H , wherein the CDR-3 of V H is selected from the group consisting of:
Y Y N D Q Y (M13, SEQ ID NO: 8),
Y S D V Y Y (M58, SEQ ID NO: 12),
and Y N D E H Y (M69, SEQ ID NO: 14),
and wherein said polypeptide construct has a low binding affinity for CD3 and is highly efficacious in activating a T-cell; and
wherein the V L polypeptide chain comprises the CDR-1, CDR-2 and CDR-3 regions of the murine OKT3 anti-CD3 antibody V L polypeptide chain and the V H polypeptide chain comprises the CDR-1 and CDR-2 regions of the murine OKT3 anti-CD3 antibody V H polypeptide chain.
2. The polypeptide construct of claim 1 , wherein said polypeptide construct is
(a) capable of specifically binding to/interacting with the CD3 of a T-cell and/or
(b) of activating a T-cell.
3. The polypeptide construct of claim 2 , wherein said activation of a T-cell comprises the upregulation of expression of cell surface proteins CD69, and/or CD25, the upregulation of expression of interferon gamma, and/or an increased cytotoxicity as compared to a non-activated T-cell.
4. The polypeptide construct of claim 1 , wherein said at least one CDR-3 region comprises a substitution in the amino acid sequence YYDDHY (SEQ ID NO:1) which is located in the CDR-3 region of a heavy chain variable region (V H ).
5. The polypeptide construct of claim 4 , wherein said heavy chain variable region is a V H -region of an antibody capable of binding to and/or interacting with CD3.
6. The polypeptide construct of claim 5 , wherein said antibody is derived from OKT-3.
7. The polypeptide construct of claim 5 , wherein said heavy chain variable region (V H ) is selected from the group consisting of
(a) a V H -region comprising an amino acid sequence derived from the sequence as shown in SEQ ID NO: 40, 42 or 57;
(b) a V H -region encoded by a nucleic acid molecule derived from the sequence as shown in SEQ ID NO: 41, 43 or 58;
(c) a V H -region which is encoded by a polynucleotide which is at least 90% identical to the nucleic acid molecule as defined in (b) and which comprises a YYDDHY-motif selected from the group consisting of
Y Y N D Q Y (M13, SEQ ID NO: 8),
Y S D V Y Y (M58, SEQ ID NO: 12), and
Y N D E H Y (M69, SEQ ID NO: 14), and
(d) a V H -region which is encoded by a polynucleotide which hybridizes under stringent conditions at 60° C. in 2×SSC and 0.1% SDS to the complementary strand of a polynucleotide/nucleic acid molecule defined in (b) or (c) and which comprises a YYDDHY-motif selected from the group consisting of
Y Y N D Q Y (M13, SEQ ID NO: 8),
Y S D V Y Y (M58, SEQ ID NO: 12), and
Y N D E H Y (M69, SEQ ID NO: 14).
8. The polypeptide construct of claim 1 , wherein said polypeptide construct is capable of binding to and/or interacting with CD3.
9. The polypeptide construct of claim 1 , wherein said polypeptide construct is highly efficacious in activating a T-cell.
10. The polypeptide construct of claim 9 , wherein said polypeptide construct comprises a CDR-3 region which comprises a sequence motif selected from the group consisting of YYNDQY (M13, SEQ ID NO. 8), YSDVYY (M58, SEQ ID NO. 12) and YNDEHY (M69, SEQ ID NO. 14).
11. The polypeptide construct of claim 1 , wherein said polypeptide construct is in the format of an Fab, an F(ab′) 2 , a single chain Fv (scFv), a bispecific scFV, an antibody fusion protein, an antibody-antigen-construct or a heterominibody.
12. The polypeptide construct of claim 1 , wherein said polypeptide construct is capable of specifically binding to/interacting with the CD3 of a T-cell and is capable of binding to/interacting with a second target molecule.
13. The polypeptide construct of claim 12 , which is a polypeptide construct capable of specifically binding to/interacting with the CD3 of a T-cell and with EpCAM.
14. The polypeptide construct of claim 13 which is a bispecific single chain construct.
15. The polypeptide construct of claim 4 , wherein said heavy chain variable region (V H ) is derived from the V H -region of OKT-3.
16. A polynucleotide encoding a polypeptide construct of claim 1 .
17. The polynucleotide of claim 16 which is DNA or RNA.
18. A vector comprising the polynucleotide of claim 16 .
19. A host cell comprising the polynucleotide of claim 16 or a vector comprising said polynucleotide.
20. A method for the preparation of a polypeptide construct of claim 1 which method comprises cultivating a host cell comprising a polynucleotide encoding said polypeptide construct and isolating said polypeptide construct from said culture.
21. A composition comprising a polypeptide construct of claim 1 .
22. The composition of claim 21 , which is a pharmaceutical composition comprising suitable formulations of carrier, stabilizers, diluents and/or excipients.
23. A kit comprising a composition comprising a polypeptide construct of claim 1 .
24. The polypeptide of claim 1 , wherein the VH polypeptide chain is selected from the group consisting of SEQ ID NOs: 40, SEQ ID NOs: 42, and SEQ ID NOs: 57, wherein the YYDDHY (SEQ ID NO: 1) sequence found in SEQ ID NOs: 40, SEQ ID NOs: 42, or SEQ ID NOs: 57 is modified by substitution with a sequence from the group consisting of SEQ ID NO: 8, SEQ ID NO: 12, and SEQ ID NO: 14.
25. The polypeptide construct of claim 14 , wherein said bispecific single chain construct is encoded by a nucleic acid molecule comprising SEQ ID NO: 74.
26. The polypeptide construct of claim 14 , wherein said bispecific single chain construct is encoded by a nucleic acid molecule comprising SEQ ID NO: 82.
27. The polypeptide construct of claim 14 , wherein said bispecific single chain construct is encoded by a nucleic acid molecule comprising SEQ ID NO: 86.
28. The polypeptide construct of claim 14 , wherein said bispecific single chain construct comprises SEQ ID NO: 73.
29. The polypeptide construct of claim 14 , wherein said bispecific single chain construct comprises SEQ ID NO: 81.
30. The polypeptide construct of claim 14 , wherein said bispecific single chain construct comprises SEQ ID NO: 85.