A single backmutation in the human kIV framework of a previously unsuccessfully humanized antibody restores the binding activity and increases the secretion in cos cells.

Abstract:

:Humanization of rodent mAbs by CDR-grafting (also called "reshaping") is now a standard procedure for reducing immunogenicity and recruiting human effector functions. However, the design of the humanized mAb can sometimes prove circuitous. Attempts were made to humanize L-25, a mouse antibody against the human alpha-4 integrin subunit using the usual protocols. Despite reaching eight backmutations in the light chain, it was not possible to recover the binding activity to the level of the chimeric. In an effort to restore the binding activity, an analysis of the human kappa IV acceptor frameworks was undertaken. This analysis highlighted the Asp at position 9 in framework 1, which although a common amino acid in human kappa IV frameworks, was an unusual residue in mouse kappa frameworks. Backmutating this position to the mouse amino acid completely restored the binding of the humanized antibody and as a by-product also increased the secretion levels in cos cells. Mutating position 9 to the consensus residue for human kappa I also restored the binding and secretion levels although not to the same extent. The resulting humanized antibody had a light chain with only a single backmutation to the mouse sequence.

journal_name

Mol Immunol

journal_title

Molecular immunology

authors

Saldanha JW,Martin AC,Léger OJ

doi

10.1016/s0161-5890(99)00087-5

subject

Has Abstract

pub_date

1999-08-01 00:00:00

pages

709-19

issue

11-12

eissn

0161-5890

issn

1872-9142

journal_volume

36

pub_type

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