Antigen binding molecules and methods of use thereof

1. A method of activating a chimeric antigen receptor (CAR)-positive T cell expressing a molecule comprising an amino acid sequence selected from the group consisting of GSTSGSGKPGSGEGSTKG (SEQ ID NO: 1), GSGKPGSGEG (SEQ ID NO: 2), GKPGSGEG (SEQ ID NO: 3), SGKPGSGE (SEQ ID NO: 499) and KPGSG (SEQ ID NO: 500), the method comprising:

(a) providing a sample comprising at least one CAR-positive T cell expressing a molecule comprising an amino acid sequence selected from the group consisting of GSTSGSGKPGSGEGSTKG (SEQ ID NO: 1), GSGKPGSGEG (SEQ ID NO: 2), GKPGSGEG (SEQ ID NO: 3), SGKPGSGE (SEQ ID NO: 499) and KPGSG (SEQ ID NO: 500); and

(b) contacting an antigen binding molecule with the sample, under conditions that permit the formation of a binding complex thereby activating the CAR-positive T cell

wherein the antigen binding molecule comprises:

(i) a VH CDR1 region comprising the amino acid sequence of SEQ ID NO: 7;

(ii) a VH CDR2 region comprising the amino acid sequence of SEQ ID NO: 8;

(iii) a VH CDR3 region comprising the amino acid sequence of SEQ ID NO: 9;

(iv) a VL CDR1 region comprising the amino acid sequence of SEQ ID NO: 13;

(v) a VL CDR2 region comprising the amino acid sequence of SEQ ID NO: 14; and

(vi) a VL CDR3 region comprising the amino acid sequence of SEQ ID NO: 15, and

wherein the antigen binding molecule comprises:

(a) a heavy chain variable region (VH) amino acid sequence that is at least about 95% identical to the amino acid sequence of SEQ ID NO: 5; and

(b) a light chain variable region (VL) amino acid sequence that is at least about 95% identical to the amino acid sequence of SEQ ID NO: 11, or

wherein the antigen binding molecule comprises:

(a) a heavy chain comprising an amino acid sequence that is at least 95%, 96%, 97%, 98% or 99% identical to the amino acid sequence of SEQ ID NO: 6; and

(b) a light chain comprising an amino acid sequence that is at least 95%, 96%, 97%, 98% or 99% identical to the amino acid sequence of SEQ ID NO: 12, and wherein the CAR-positive T cell is selected from the group consisting of CD8+ T cell, CD4+ T cell, tumor infiltrating lymphocyte (TIL), TCR-expressing cell, and NK-T cell.

2. The method of claim 1 , wherein the CAR-positive T cell is a CD8 + T cell.

3. The method of claim 2 , wherein the T cell is in vitro.

4. The method of claim 2 , wherein the T cell is in vivo.

5. The method of claim 2 , wherein the T cell is isolated from blood, extracted tissue, tissue grown ex vivo, and cell culture media.

6. The method of claim 2 , wherein the T cell is an autologous T cell.

7. The method of claim 2 , wherein the T cell is an allogenic T cell.

8. The method of claim 1 , wherein the antigen binding molecule is selected from the group consisting of an scFv, a Fab, a Fab′, a Fv, a F(ab′)2, a dAb, a human antibody, a humanized antibody, a chimeric antibody, a monoclonal antibody, a polyclonal antibody, a recombinant antibody, an IgE antibody, an IgD antibody, an IgM antibody, an IgG1 antibody, an IgG1 antibody having at least one mutation in the hinge region, an IgG2 antibody, an IgG2 antibody having at least one mutation in the hinge region, an IgG3 antibody, an IgG3 antibody having at least one mutation in the hinge region, an IgG4 antibody, and an IgG4 antibody having at least one mutation in the hinge region, and a combination thereof.

9. The method of claim 8 , wherein the antigen binding molecule is a humanized antibody.

10. The method of claim 1 , wherein the isolated antigen binding molecule comprises

(a) a heavy chain variable region (VH) comprising the amino acid sequence of SEQ ID NO: 5; and

(b) a light chain variable region (VL) comprising the amino acid sequence of SEQ ID NO: 11.

11. The method of claim 1 , wherein the isolated antigen binding molecule comprises

(a) a heavy chain comprising the amino acid sequence of SEQ ID NO: 6; and

(b) a light chain comprising the amino acid sequence of SEQ ID NO: 12.

12. The method of claim 8 , wherein the isolated antigen binding molecule is a humanized antibody.

13. A method of activating a chimeric antigen receptor (CAR)-positive T cell expressing a molecule comprising an amino acid sequence selected from the group consisting of GSTSGSGKPGSGEGSTKG (SEQ ID NO: 1), GSGKPGSGEG (SEQ ID NO: 2), GKPGSGEG (SEQ ID NO: 3), SGKPGSGE (SEQ ID NO: 499) and KPGSG (SEQ ID NO: 500), the method comprising:

(a) providing a sample comprising at least one CAR-positive T cell expressing a molecule comprising an amino acid sequence selected from the group consisting of GSTSGSGKPGSGEGSTKG (SEQ ID NO: 1), GSGKPGSGEG (SEQ ID NO: 2), GKPGSGEG (SEQ ID NO: 3), SGKPGSGE (SEQ ID NO: 499) and KPGSG (SEQ ID NO: 500); and

(b) contacting an antigen binding molecule with the sample, under conditions that permit the formation of a binding complex thereby activating the CAR-positive T cell

wherein the antigen binding molecule comprises:

(i) a VH CDR1 region comprising the amino acid sequence of SEQ ID NO: 19;

(ii) a VH CDR2 region comprising the amino acid sequence of SEQ ID NO: 20;

(iii) a VH CDR3 region comprising the amino acid sequence of SEQ ID NO: 21;

(iv) a VL CDR1 region comprising the amino acid sequence of SEQ ID NO: 25;

(v) a VL CDR2 region comprising the amino acid sequence of SEQ ID NO: 26; and

(vi) a VL CDR3 region comprising the amino acid sequence of SEQ ID NO: 27, and wherein the antigen binding molecule comprises:

(a) a heavy chain variable region (VH) amino acid sequence that is at least about 95% identical to the amino acid sequence of SEQ ID NO: 17; and

(b) a light chain variable region (VL) amino acid sequence that is at least about 95% identical to the amino acid sequence of SEQ ID NO: 23, or

wherein the antigen binding molecule comprises:

(a) a heavy chain comprising an amino acid sequence that is at least 95%, 96%, 97%, 98% or 99% identical to the amino acid sequence of SEQ ID NO: 18; and

(b) a light chain comprising an amino acid sequence that is at least 95%, 96%, 97%, 98% or 99% identical to the amino acid sequence of SEQ ID NO: 24, and

wherein the CAR-positive T cell is selected from the group consisting of CD8+ T cell, CD4+ T cell, tumor infiltrating lymphocyte (TIL), TCR-expressing cell, dendritic cell, and NK-T cell.

14. The method of claim 13 , wherein the isolated antigen binding molecule comprises

(a) a heavy chain variable region (VH) comprising the amino acid sequence of SEQ ID NO: 17; and

(b) a light chain variable region (VL) comprising the amino acid sequence of SEQ ID NO: 23.

15. The method of claim 13 , wherein the isolated antigen binding molecule comprises

(a) a heavy chain comprising the amino acid sequence of SEQ ID NO: 18; and

(b) a light chain comprising the amino acid sequence of SEQ ID NO: 24.