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Epidermal growth factor receptor downregulation by small heterodimeric binding proteins.


ABSTRACT: No single engineered protein has been shown previously to robustly downregulate epidermal growth factor receptor (EGFR), a validated cancer target. A panel of fibronectin-based domains was engineered to bind with picomolar to nanomolar affinity to multiple epitopes of EGFR. Monovalent and homo- and hetero-bivalent dimers of these domains were tested for EGFR downregulation. Selected orientations of non-competitive heterodimers decrease EGFR levels by up to 80% in multiple cell types, without activating receptor signaling. These heterodimers inhibit autophosphorylation, proliferation and migration, and are synergistic with the monoclonal antibody cetuximab in these activities. These small (25 kDa) heterodimers represent a novel modality for modulating surface receptor levels.

SUBMITTER: Hackel BJ 

PROVIDER: S-EPMC3286197 | biostudies-literature | 2012 Feb

REPOSITORIES: biostudies-literature

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Epidermal growth factor receptor downregulation by small heterodimeric binding proteins.

Hackel Benjamin J BJ   Neil Jason R JR   White Forest M FM   Wittrup K Dane KD  

Protein engineering, design & selection : PEDS 20111209 2


No single engineered protein has been shown previously to robustly downregulate epidermal growth factor receptor (EGFR), a validated cancer target. A panel of fibronectin-based domains was engineered to bind with picomolar to nanomolar affinity to multiple epitopes of EGFR. Monovalent and homo- and hetero-bivalent dimers of these domains were tested for EGFR downregulation. Selected orientations of non-competitive heterodimers decrease EGFR levels by up to 80% in multiple cell types, without act  ...[more]

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