Antigen binding proteins specifically binding prame

Abstract

The present invention concerns antigen binding proteins directed against PRAME protein-derived antigens. The invention in particular provides antigen binding proteins which are specific for the tumor expressed antigen PRAME, wherein the tumor antigen comprises or consists of SEQ ID NO: 50 and is in a complex with a major histocompatibility complex (MHC) protein. The antigen binding proteins of the invention contain, in particular, the complementary determining regions (CDRs) of novel engineered T cell receptors (TCRs) that specifically bind to said PRAME peptide. The antigen binding proteins of the invention are for use in the diagnosis, treatment and prevention of PRAME expressing cancerous diseases. Further provided are nucleic acids encoding the antigen binding proteins of the invention, vectors comprising said nucleic acids, recombinant cells expressing the antigen binding proteins and pharmaceutical compositions comprising the antigen binding proteins of the invention.

What is claimed is: 
     
         1 . An antigen binding protein comprising
 a complementary determining region (CDR)a1 comprising the amino acid sequence of SEQ ID NO: 16,   a CDRa2 comprising the amino acid sequence of SEQ ID NO: 32, and   a CDRa3 comprising the amino acid sequence of SEQ ID NO: 34,   a CDRb1 comprising the amino acid sequence of SEQ ID NO: 10,   a CDRb2 comprising the amino acid sequence of SEQ ID NO: 36, and   a CDRb3 comprising the amino acid sequence of SEQ ID NO: 292,
 wherein one or more of the CDRa1, the CDRa2, the CDRa3, the CDRb1, the CDRb2, and the CDRb3 comprise at most one conservative amino acid substitution. 
   
     
     
         2 . The antigen binding protein of  claim 1 , wherein the CDRa1, CDRa2, and CDRa3 are located in a T cell receptor (TCR) a variable domain comprising SEQ ID NO: 132 and the CDRb1, CDRb2, and CDRb3 are located in a TCR β variable domain comprising SEQ ID NO: 140. 
     
     
         3 . The antigen binding protein of  claim 1 , wherein the antigen binding protein binds to a peptide consisting of the amino acid sequence of SLLQHLIGL (SEQ ID NO: 50) in a complex with an MHC class I molecule. 
     
     
         4 . An isolated nucleic acid comprising a sequence or two separate isolated nucleic acids comprising two sequences encoding the antigen binding protein of  claim 1 . 
     
     
         5 . A vector comprising the nucleic acid of  claim 4 . 
     
     
         6 . A host cell comprising the vector of  claim 5 . 
     
     
         7 . A pharmaceutical composition comprising the antigen binding protein of  claim 1 , wherein the antigen binding protein is dissolved or dispersed in a pharmaceutically acceptable carrier or aqueous medium. 
     
     
         8 . A TCR comprising
 a CDRa1 comprising the amino acid sequence of SEQ ID NO: 16,   a CDRa2 comprising the amino acid sequence of SEQ ID NO: 32, and   a CDRa3 comprising the amino acid sequence of SEQ ID NO: 34,   a CDRb1 comprising the amino acid sequence of SEQ ID NO: 10,   a CDRb2 comprising the amino acid sequence of SEQ ID NO: 36, and   a CDRb3 comprising the amino acid sequence of SEQ ID NO: 292,
 wherein one or more of the CDRa1, the CDRa2, the CDRa3, the CDRb1, the CDRb2, and the CDRb3 comprise at most one conservative amino acid substitution. 
   
     
     
         9 . The TCR of  claim 8 , wherein the TCR u variable domain comprises SEQ ID NO: 132 and the TCR β variable domain comprises SEQ ID NO: 140. 
     
     
         10 . A vector comprising a nucleic acid comprising a sequence or two separate isolated nucleic acids comprising two sequences encoding the TCR of  claim 8 . 
     
     
         11 . A host cell comprising the vector of  claim 10 . 
     
     
         12 . A pharmaceutical composition comprising the TCR of  claim 8 , wherein the TCR is dissolved or dispersed in a pharmaceutically acceptable carrier or aqueous medium. 
     
     
         13 . The antigen binding protein of  claim 1 , wherein
 the CDRa1 comprises SEQ ID NO: 16,   the CDRa2 comprises SEQ ID NO: 32,   the CDRa3 consists of SEQ ID NO: 34,   the CDRb1 comprises SEQ ID NO: 10,   the CDRb2 comprises SEQ ID NO: 36, and   the CDRb3 consists of SEQ ID NO: 292.   
     
     
         14 . The antigen binding protein of  claim 1 , wherein
 the CDRa1 consists of SEQ ID NO: 16,   the CDRa2 comprises SEQ ID NO: 32,   the CDRa3 consists of SEQ ID NO: 34,   the CDRb1 consists of SEQ ID NO: 10,   the CDRb2 comprises SEQ ID NO: 36, and   the CDRb3 consists of SEQ ID NO: 292.   
     
     
         15 . The antigen binding protein of  claim 1 , wherein
 the CDRa1 consists of SEQ ID NO: 16,   the CDRa2 consists of SEQ ID NO: 32,   the CDRa3 consists of SEQ ID NO: 34,   the CDRb1 consists of SEQ ID NO: 10,   the CDRb2 consists of SEQ ID NO: 36, and   the CDRb3 consists of SEQ ID NO: 292.   
     
     
         16 . The TCR of  claim 8 , wherein
 the CDRa1 comprises SEQ ID NO: 16,   the CDRa2 comprises SEQ ID NO: 32,   the CDRa3 consists of SEQ ID NO: 34,   the CDRb1 comprises SEQ ID NO: 10,   the CDRb2 comprises SEQ ID NO: 36, and   the CDRb3 consists of SEQ ID NO: 292.   
     
     
         17 . The TCR of  claim 8 , wherein
 the CDRa1 consists of SEQ ID NO: 16,   the CDRa2 comprises SEQ ID NO: 32,   the CDRa3 consists of SEQ ID NO: 34,   the CDRb1 consists of SEQ ID NO: 10,   the CDRb2 comprises SEQ ID NO: 36, and   the CDRb3 consists of SEQ ID NO: 292.   
     
     
         18 . The TCR of  claim 8 , wherein
 the CDRa1 consists of SEQ ID NO: 16,   the CDRa2 consists of SEQ ID NO: 32,   the CDRa3 consists of SEQ ID NO: 34,   the CDRb1 consists of SEQ ID NO: 10,   the CDRb2 consists of SEQ ID NO: 36, and   the CDRb3 consists of SEQ ID NO: 292.   
     
     
         19 . The TCR of  claim 8 , wherein the TCR binds to a peptide consisting of the amino acid sequence of SLLQHLIGL (SEQ ID NO: 50) in a complex with an MHC class I molecule. 
     
     
         20 . The antigen binding protein of  claim 1 , wherein the CDRa1, CDRa2, and CDRa3 are located in a first polypeptide comprising at least 95% sequence identity to SEQ ID NO: 291 and the CDRb1, CDRb2, and CDRb3 are located in a second polypeptide comprising at least 95% sequence identity to SEQ ID NO: 164. 
     
     
         21 . The antigen binding protein of  claim 1 , wherein the CDRa1, CDRa2, and CDRa3 are located in a first polypeptide comprising at least 98% sequence identity to SEQ ID NO: 291 and the CDRb1, CDRb2, and CDRb3 are located in a second polypeptide comprising at least 98% sequence identity to SEQ ID NO: 164. 
     
     
         22 . The antigen binding protein of  claim 1 , wherein the CDRa1, CDRa2, and CDRa3 are located in a first polypeptide comprising SEQ ID NO: 291 and the CDRb1, CDRb2, and CDRb3 are located in a second polypeptide comprising SEQ ID NO: 164. 
     
     
         23 . The antigen binding protein of  claim 1 , wherein the CDRa1, CDRa2, and CDRa3 are located in a first polypeptide consisting of SEQ ID NO: 291 and the CDRb1, CDRb2, and CDRb3 are located in a second polypeptide consisting of SEQ ID NO: 164.