Optimized antibody variable regions
The present invention is directed to optimized anti-CD3 variable sequences for use in a variety of bispecific formats, including those that utilize scFv components. The invention further relates to nucleic acids encoding for the polypeptide, to vectors comprising the same and to host cells comprising the vector. In another aspect, the invention provides for a pharmaceutical composition comprising the mentioned polypeptide and medical uses of the polypeptide.
1. A nucleic acid composition comprising a nucleic acid encoding an anti-CD3 scFv, the anti-CD3 scFv comprising:
a) a variable heavy chain comprising a vhCDR1 having the amino acid sequence of SEQ ID NO:411; a vhCDR2 having the amino acid sequence of SEQ ID NO: 413; and a vhCDR3 having the amino acid sequence of SEQ ID NO: 417;
b) a variable light chain comprising a v1CDR1 having the amino acid sequence of SEQ ID NO: 420; a v1CDR2 having the amino acid sequence of SEQ ID NO: 425; and a v1CDR3 having the amino acid sequence of SEQ ID NO: 433; and
c) a charged scFv linker, wherein the charged scFv linker covalently attaches the variable heavy chain and the variable light chain.
2. A nucleic acid composition according to claim 1 , wherein the variable heavy chain has the amino acid sequence of SEQ ID NO: 397; and a variable light chain has the amino acid sequence of SEQ ID NO: 398.
3. A nucleic acid composition comprising a nucleic acid encoding an anti-CD3 scFv, the anti-CD3 scFv comprising:
a) a first variable heavy chain comprising a vhCDR1, vhCDR2 and vhCDR3 of a variable heavy chain having the amino acid sequence SEQ ID NO:397; and
b) a variable light chain comprising a v1CDR1, v1CDR2 and v1CDR3 of a variable light chain having the amino acid sequence of SEQ ID NO:398.
4. An expression vector comprising the nucleic acid of any one of claims 1 to 3 .
5. A host cell comprising the expression vector of claim 4 .
6. A method of making an anti-CD3 scFv comprising culturing the host cell of claim 5 under conditions wherein the anti-CD3 scFv is expressed, and recovering the anti-CD3 scFv.