| abstract |
Disclosed are a CD3-targeting antibody, a bispecific antibody and the use thereof. The CD3-targeting antibody comprises a light chain variable region (VL) and a heavy chain variable region (VH). The VL has the amino acid sequence as shown in SEQ ID NO: 56 or a mutation thereof. The VH has mutations on the amino acid sequence as shown in SEQ ID NO: 42, and the mutations occur at one or more of the sites of amino acid residues selected from positions 30, 73, 76, 78, 93 and 94. The bispecific antibody comprises a first protein functional region and a second protein functional region, wherein the first protein functional region comprises the CD3-targeting antibody as described above. The CD3-targeting antibody reduces the toxicity caused by cytokine release syndrome, and the bispecific antibody prepared therefrom is stable and has the ability to bind to T cells, and also reduces the difficulty of producing. |