The invention relates to a triple-effect
T cell adapter for targeting
T cell lymphoma TRBC1. The invention discloses a TRBC1-targeted triple-effect
T cell adapter which is composed of an Fc region, a
hinge region, a first Fab arm and a second Fab arm, and a third targeting module is covalently connected to the C end of the Fc region to form a Y-shaped triple-head
antibody. The first Fab arm and the second Fab arm are respectively combined with TRBC1 and CD3, and the third Fab arm is combined with CD28 or CD137, so that three functions of tumor recognition, T
cell recruitment and co-stimulation amplification are integrated. The two polypeptide chains are heterodimerized through CH3 region button
mutation, and correct
assembly is ensured. The structure supports module interchange, programmable regulation and control of synergistic signals, significantly enhances TRBC1 positive
T cell lymphoma killing, reduces
toxicity to normal T cells, has
high activity and a wide safety window, and is suitable for preparation of related drugs.