IP Library Granted Patent US 12,398,191
Granted Patent B2
US 12,398,191 · App. 16/638,339 · Granted Aug 26, 2025

BRAF-specific TCRs and uses thereof

Inventors: Joshua Veatch (Seattle, WA); Stanley R. Riddell (Sammamish, WA); Sylvia Lee (Seattle, WA)
Assignees: FRED HUTCHINSON CANCER CENTER; UNIVERSITY OF WASHINGTON
C07K14/7051A61K35/17A61K40/11A61K40/32A61K40/4251A61P35/00C12N5/0636C12N7/00C12N15/86A61K38/00A61K2239/57C12N2740/10043
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Quick Facts
Patent No.
US 12,398,191
App. No.
16/638,339
Granted
Aug 26, 2025
Kind
B2
Abstract

The present disclosure provides binding proteins, such as TCRs, that specifically bind various tumor associated antigens (including human BRAFV600E epitope), cells expressing such antigen specific binding proteins, nucleic acids encoding the same, and compositions for use in treating diseases or disorders in which cells express BRAFV600E, such as in cancer.

Claims (41)

1. An isolated polynucleotide encoding a binding protein, wherein the binding protein comprises:

(a) a T cell receptor (TCR) α chain variable (Vα) domain comprising the Vα domain amino acid sequence set forth in SEQ ID NO.:1; and

(b) a TCR β chain variable (Vβ) domain comprising the Vβ domain amino acid sequence set forth in SEQ ID NO.:5,

wherein the binding protein is capable of specifically binding to a HLA complex on a cell surface comprising a BRAF peptide containing a BRAF V600E mutation and does not bind a HLA complex on a cell surface comprising a BRAF peptide not containing the BRAF V600E mutation,

wherein the BRAF V600E peptide consists of the amino acid sequence set forth in SEQ ID NO: 38 or 39,

wherein the HLA complex comprises (1) HLA-DQA1*03 and (2) HLA-DQB1*0301, HLA-DQB1*0302, or HLA-DQB1*0303, wherein:

(i) the binding protein comprises a TCR, wherein the Vα domain is comprised in a TCR α chain that further comprises a constant (Cα) domain comprising an introduced cysteine mutation, and the Vβ domain is comprised in a TCR β chain that further comprises a constant (Cβ) domain comprising an introduced cysteine mutation, wherein the introduced cysteine mutations promote pairing of the TCR α chain with the TCR β chain when the binding protein is expressed in a T cell;

(ii) the polynucleotide comprises a sequence encoding a self-cleaving peptide disposed between a sequence encoding the Vβ domain and a sequence encoding the Vα domain;

(iii) the polynucleotide is codon optimized for expression in a human T cell; or

(iv) the binding protein comprises a single chain TCR (scTCR) or a chimeric antigen receptor (CAR).

2. The polynucleotide according to claim 1 , wherein the Vα domain is comprised in a TCR α chain that further comprises a constant (Cα) domain comprising an introduced cysteine mutation, and the Vβ domain is comprised in a TCR β chain that further comprises a constant (Cβ) domain comprising an introduced cysteine mutation, wherein the introduced cysteine mutations promote pairing of the TCR α chain with the TCR β chain when the binding protein is expressed in a T cell.

3. The polynucleotide according to claim 1 , wherein the polynucleotide is codon optimized for expression in a human T cell.

4. The polynucleotide according to claim 1 , wherein the binding protein is a TCR, an antigen-binding fragment of a TCR, or a chimeric antigen receptor.

5. The polynucleotide according to claim 4 , wherein the binding protein is a TCR and comprises (i) an α chain constant (Cα) domain comprising the amino acid sequence of SEQ ID NO:25 and (ii) a β chain (Cβ) constant domain comprising the amino acid sequence of SEQ ID NO: 26.

6. An isolated polynucleotide encoding a TCR, wherein the TCR comprises (i) a TCR α chain that comprises the amino acid sequence set forth in SEQ ID NO: 55 and (ii) a TCR β chain that comprises the amino acid sequence set forth in SEQ ID NO: 59.

7. An expression vector, comprising a polynucleotide encoding a binding protein, wherein the binding protein comprises:

(a) a T cell receptor (TCR) α chain variable (Vα) domain comprising the Vα domain amino acid sequence set forth in SEQ ID NO.:1; and

(b) a TCR β chain variable (Vβ) domain comprising the Vβ domain amino acid sequence set forth in SEQ ID NO.:5,

wherein the binding protein is capable of specifically binding to a HLA complex on a cell surface comprising a BRAF peptide containing a BRAF V600E mutation and does not bind a HLA complex on a cell surface comprising a BRAF peptide not containing the BRAF V600E mutation,

wherein the BRAF V600E peptide consists of the amino acid sequence set forth in SEQ ID NO: 38 or 39,

wherein the HLA complex comprises (1) HLA-DQA1*03 and (2) HLA-DQB1*0301, HLA-DQB1*0302, or HLA-DQB1*0303,

and wherein:

(i) the expression vector (1) comprises an expression control element that is operably coupled to the polynucleotide and is heterologous to the polynucleotide, and/or (2) comprises a viral vector, a bacterial vector, a plasmid, or a cosmid;

(ii) the binding protein comprises a TCR, wherein the Vα domain is comprised in a TCR α chain that further comprises a constant (Cα) domain comprising an introduced cysteine mutation, and the Vβ domain is comprised in a TCR β chain that further comprises a constant (Cβ) domain comprising an introduced cysteine mutation, wherein the introduced cysteine mutations promote pairing of the TCR α chain with the TCR β chain when the binding protein is expressed in a T cell;

iii) the polynucleotide comprises a sequence encoding a self-cleaving peptide disposed between a sequence encoding the VB domain and a sequence encoding the Vα domain;

(iv) the polynucleotide is codon optimized for expression in a human T cell; and/or

(v) the binding protein comprises a single chain TCR (scTCR) or a chimeric antigen receptor (CAR).

8. A host cell, comprising a polynucleotide according to claim 1 , wherein the host cell expresses on its cell surface the encoded binding protein.

9. A host cell comprising a heterologous polynucleotide encoding a binding protein, wherein the encoded binding protein comprises:

(a) a T cell receptor (TCR) α chain variable (Vα) domain comprising the Vα domain amino acid sequence set forth in SEQ ID NO:1, and

(b) a TCR β chain variable (Vβ) domain comprising the Vβ domain amino acid sequence set forth in SEQ ID NO:5,

wherein the binding protein is capable of specifically binding to a HLA complex on a cell surface comprising a BRAF peptide containing a BRAF V600E mutation and does not bind a HLA complex on a cell surface comprising a BRAF peptide not containing the BRAF V600E mutation,

wherein the BRAF V600E peptide consists of the amino acid sequence set forth in SEQ ID NO: 38 or 39,

wherein the HLA complex comprises (1) HLA-DQA1*03 and (2) HLA-DQB1*0301, HLA-DQB1*0302, or HLA-DQB1*0303.

10. The host cell according to claim 9 , wherein the host cell comprises a CD4+ T cell, a CD8+ T cell, a CD4− CD8− double negative T cell, a γδ T cell, a natural killer cell, a dendritic cell, or any combination thereof.

11. The host cell according to claim 9 , wherein the host cell is a hematopoietic progenitor cell or an immune system cell.

12. The host cell according to claim 9 , wherein the encoded binding protein comprises: a TCR α chain that comprises or consists of the amino acid sequence set forth in SEQ ID NO.:55; and a TCR β chain that comprises or consists of the amino acid sequence set forth in SEQ ID NO.:59.

13. A CD4+ or CD8+ T cell encoding the amino acid sequence of SEQ ID NO.:69.

14. The host cell according to claim 8 , wherein the host cell comprises a T cell.

15. A vector comprising the polynucleotide of claim 1 , wherein the vector comprises a lentiviral vector or a retroviral vector.

16. The host cell according to claim 9 , wherein the binding protein is a TCR and the host cell comprises a CD4+ T cell.

Assignments (3)
MERGER AND CHANGE OF NAME Recorded Jun 24, 2025
From: FRED HUTCHINSON CANCER RESEARCH CENTER; SEATTLE CANCER CARE ALLIANCE
To: FRED HUTCHINSON CANCER CENTER
Reel/Frame 071724/0471 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Feb 22, 2022
From: VEATCH, JOSHUA; RIDDELL, STANLEY R.
To: FRED HUTCHINSON CANCER RESEARCH CENTER
Reel/Frame 059068/0129 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Feb 22, 2022
From: LEE, SYLVIA
To: UNIVERSITY OF WASHINGTON
Reel/Frame 059068/0157 →
Continuity (3)
Provisional Application 62544695 · Aug 11, 2017
Related Publication 20200223899A1 · Jul 16, 2020
Related Publication 20210238250A9 · Aug 5, 2021
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