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Bispecific antigen binding proteins

  • US 9,676,845 B2
  • Filed: 05/17/2010
  • Issued: 06/13/2017
  • Est. Priority Date: 06/16/2009
  • Status: Active Grant
First Claim
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1. A bispecific antigen binding protein, comprising:

  • a) two light chains and two heavy chains of an antibody that comprises two Fab fragments and that specifically binds to a first antigen; and

    b) two additional Fab fragments of an antibody which specifically binds to a second antigen, wherein the additional Fab fragments are both fused via a peptide connector either at the C- or N-termini of the heavy chains of a);

    wherein the bispecific antigen binding protein also comprises a structural modification selected from the group consisting of;

    i) in both Fab fragments of a) or in both Fab fragments of b)the variable domains VL and VH are replaced by each other, and the constant domains CL and CH1 are replaced by each other, or the constant domains CL and CH1 are replaced by each other;

    ii) in both Fab fragments of a)the variable domains VL and VH are replaced by each other, andthe constant domains CL and CH1 are replaced by each other, and in both Fab fragments of b)the variable domains VL and VH are replaced by each other, orthe constant domains CL and CH1 are replaced by each other;

    iii) in both Fab fragments of a)the variable domains VL and VH are replaced by each other, orthe constant domains CL and CH1 are replaced by each other, and in both Fab fragments of b)the variable domains VL and VH are replaced by each other, andthe constant domains CL and CH1 are replaced by each other;

    iv) in both Fab fragments of a)the variable domains VL and VH are replaced by each other, andin both Fab fragments of b)the constant domains CL and CH1 are replaced by each other; and

    v) in both Fab fragments of a)the constant domains CL and CH1 are replaced by each other, and in both Fab fragments of b)the variable domains VL and VH are replaced by each other.

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