Prostate-specific membrane antigen binding proteins and related compositions and methods

1. A prostate-specific membrane antigen (PSMA)-binding polypeptide comprising a humanized PSMA-binding domain, a first hinge region, an immunoglobulin constant region and a second binding domain, wherein the PSMA binding domain comprises:

(i) an immunoglobulin light chain variable region comprising LCDR1, LCDR2, and LCDR3, and

(ii) an immunoglobulin heavy chain variable region comprising HCDR1, HCDR2, and HCDR3,

wherein the LCDR1, LCDR2 and LCDR3 have the amino acid sequences set forth in SEQ ID NOs: 15, 16 and 17, respectively, and the HCDR1, HCDR2, and HCDR3 have the amino acid sequences set forth in SEQ ID NOs: 9, 10 and 11, respectively;

wherein the second binding domain specifically binds a T cell receptor (TCR) complex or a component thereof; and

wherein the PSMA-binding polypeptide is capable of inducing redirected T cell cytotoxicity (RTCC) against a cell expressing PSMA.

2. The PSMA-binding polypeptide of claim 1 , wherein the second binding domain specifically binds CD3.

3. The PSMA-binding polypeptide of claim 1 , wherein the immunoglobulin constant region comprises immunoglobulin CH2 and CH3 domains of IgG1, IgG2, IgG3, IgG4, IgA1, IgA2 or IgD.

4. The PSMA-binding polypeptide of claim 1 , wherein the PSMA-binding domain comprises an amino acid sequence that is at least 95% identical to the amino acid sequence set forth in SEQ ID NO:38, SEQ ID NO:39, SEQ ID NO:42, SEQ ID NO:43, SEQ ID NO:70, or SEQ ID NO:72.

5. The PSMA-binding polypeptide of claim 1 , wherein the PSMA-binding polypeptide comprises, in order from amino-terminus to carboxyl-terminus or in order from carboxyl-terminus to amino-terminus,

(a) the PSMA binding domain,

(b) the first hinge region,

(c) the immunoglobulin constant region,

(d) a second hinge region, and

(e) the second binding domain.

6. The PSMA-binding polypeptide of claim 5 , wherein the first hinge region and/or the second hinge region is derived from (i) a stalk region of a type II C lectin or (ii) an immunoglobulin hinge region.

7. The PSMA-binding polypeptide of claim 1 , wherein the light and heavy chain variable regions of the second binding domain are selected from the group consisting of:

(a) a light chain variable region comprising an amino acid sequence that is at least 95% identical to the amino acid sequence set forth in residues 139-245 of SEQ ID NO:47 and comprising complementarity determining regions (CDRs) comprising the amino acid sequences of the corresponding CDRs set forth in residues 139-245 of SEQ ID NO:47 and a heavy chain variable region comprising an amino acid sequence that is at least 95% identical to the amino acid sequence set forth in residues 1-121 of SEQ ID NO:47 and comprising CDRs comprising the amino acid sequences of the corresponding CDRs set forth in residues 1-121 of SEQ ID NO:47;

(b) a light chain variable region comprising an amino acid sequence that is at least 95% identical to the amino acid sequence set forth in residues 634-740 of SEQ ID NO:78 and comprising CDRs comprising the amino acid sequences of the corresponding CDRs set forth in residues 634-740 of SEQ ID NO:78 and a heavy chain variable region comprising an amino acid sequence that is at least 95% identical to the amino acid sequence set forth in residues 496-616 of SEQ ID NO:78 and comprising CDRs comprising the amino acid sequences of the corresponding CDRs set forth in residues 496-616 of SEQ ID NO:78; and

(c) a light chain variable region comprising an amino acid sequence that is at least 95% identical to the amino acid sequence set forth in SEQ ID NO:86 and comprising CDRs comprising the amino acid sequences of the corresponding CDRs set forth in SEQ ID NO:86 and a heavy chain variable region comprising an amino acid sequence that is at least 95% identical to the amino acid sequence set forth in SEQ ID NO:87 and comprising CDRs comprising the amino acid sequences of the corresponding CDRs set forth in SEQ ID NO:87.

8. The PSMA-binding polypeptide of claim 1 , wherein said PSMA-binding polypeptide comprises an amino acid sequence that is at least 95% identical to the amino acid sequence set forth in SEQ ID NO:49, SEQ ID NO:51, SEQ ID NO:74, SEQ ID NO:76, SEQ ID NO:78, SEQ ID NO:80, SEQ ID NO:82, SEQ ID NO:84, SEQ ID NO:158, SEQ ID NO:160, SEQ ID NO:162, or SEQ ID NO:164.

9. The PSMA-binding polypeptide of claim 1 , wherein the PSMA-binding domain is a single chain Fv (scFv).

10. The PSMA-binding polypeptide of claim 9 , wherein the light chain variable region and heavy chain variable region of the scFv are joined by an amino acid sequence comprising (Gly4Ser)n, wherein n=1-5 (SEQ ID NO:165).

11. The PSMA-binding polypeptide of claim 9 , wherein the scFv comprises an amino acid sequence that is at least 95% identical to the amino acid sequence set forth in SEQ ID NO:19, SEQ ID NO:21, SEQ ID NO:30, SEQ ID NO:31, SEQ ID NO:34, or SEQ ID NO:35.

12. A dimeric PSMA-binding protein comprising first and second polypeptide chains, wherein each of said polypeptide chains is the PSMA-binding polypeptide of claim 1 .

13. A composition comprising the PSMA-binding protein of claim 12 and a pharmaceutically acceptable carrier, diluent, or excipient.

14. An isolated nucleic acid encoding the PSMA-binding polypeptide of claim 1 .

15. A recombinant host cell comprising the nucleic acid of claim 14 .

16. A PSMA-binding polypeptide comprising a humanized PSMA-binding domain, a first hinge region, an immunoglobulin constant region and a second binding domain, wherein the PSMA binding domain comprises:

(i) an immunoglobulin light chain variable region comprising LCDR1, LCDR2, and LCDR3, and

(ii) an immunoglobulin heavy chain variable region comprising HCDR1, HCDR2, and HCDR3,

wherein the LCDR1, LCDR2 and LCDR3 have the amino acid sequences set forth in SEQ ID NOs: 15, 16 and 17, respectively, and the HCDR1, HCDR2, and HCDR3 have the amino acid sequences set forth in SEQ ID NOs: 9, 10 and 11, respectively; wherein the second binding domain specifically binds a T cell receptor (TCR) complex or a component thereof;

wherein the immunoglobulin light chain variable region comprises an amino acid sequence that is at least 95% identical to the amino acid sequence set forth in SEQ ID NO:5 or SEQ ID NO:23 and the heavy chain variable region comprises an amino acid sequence that is at least 95% identical to the amino acid sequence set forth in SEQ ID NO:2, SEQ ID NO:25, or SEQ ID NO:27; and

wherein the PSMA-binding polypeptide is capable of inducing redirected T cell cytotoxicity (RTCC) against a cell expressing PSMA.

17. The PSMA-binding polypeptide of claim 16 , wherein the light chain variable region comprises the amino acid sequence set forth in SEQ ID NO:23 and the heavy chain variable region comprises the amino acid sequence set forth in SEQ ID NO:25 or SEQ ID NO:27.

18. A method for treating a disorder in a subject, wherein the disorder is characterized by overexpression of PSMA and wherein the disorder is a cancer, a prostate disorder, or a neovascular disorder, the method comprising administering to the subject a therapeutically effective amount of the dimeric PSMA-binding protein of claim 12 under conditions whereby RTCC in the subject is induced against a cell expressing PSMA, thereby treating said disorder in the subject.

19. The method of claim 18 , wherein the disorder is prostate cancer, colorectal cancer, gastric cancer, castrate-resistant prostate cancer, benign prostatic hyperplasia, solid tumor growth, clear cell renal carcinoma, colorectal cancer, bladder cancer, or lung cancer.