Abstract: The present disclosure provides multispecific antibodies having increased in vivo sustainability, the multispecific antibodies comprising one or more bioactive effector moieties linked to either or both of an N-terminal and a C-terminal of an antigen binding fragment Fab that binds to human serum albumin.

Abstract: The present invention relates to antigen-binding fragment (Fab) and a Fab-effector fusion protein or polypeptide comprising thereof. The Fab of the present invention specifically binds to serum albumin and thereby has extended in vivo half-life. The Fab of the present invention is characterized by not having cysteine residues that are responsible for the interchain disulfide bond in CH1 domain and C kappa L domain as well. The Fab-effector fusion protein or polypeptide of the present invention can be produced in periplasm of E. coli with high yield, and has increased in vivo half-life. Further, the present invention provides E. coli strain which produces various kinds of Fab-effector fusion proteins or polypeptides, and a pharmaceutical composition comprising the fab-effector fusion proteins or polypeptides.

Abstract: The present invention relates to antigen-binding fragment (Fab) and a Fab-effector fusion protein or (poly)peptide comprising thereof. The Fab of the present invention specifically binds to serum albumin and thereby has extended in vivo half-life. The Fab of the present invention is characterized by not having cysteine residues that are responsible for the interchain disulfide bond in CH1 domain and C?L domain as well. The Fab-effector fusion protein or (poly)peptide of the present invention can be produced in periplasm of E. coli with high yield, and has increased in vivo half-life. Further, the present invention provides E. coli strain which produces various kinds of Fab-effector fusion proteins or (poly)peptides, and a pharmaceutical composition comprising the fab-effector fusion proteins or (poly)peptides.