Intramolecular trimerization, a novel strategy for making multispecific antibodies with controlled orientation of the antigen binding domains.

Abstract:

:Here, we describe a new strategy that allows the rapid and efficient engineering of mono and multispecific trivalent antibodies. By fusing single-domain antibodies from camelid heavy-chain-only immunoglobulins (VHHs) to the N-terminus of a human collagen XVIII trimerization domain (TIE(XVIII)) we produced monospecific trimerbodies that were efficiently secreted as soluble functional proteins by mammalian cells. The purified VHH-TIE(XVIII) trimerbodies were trimeric in solution and exhibited excellent antigen binding capacity. Furthermore, by connecting with two additional glycine-serine-based linkers three VHH-TIE(XVIII) modules on a single polypeptide chain, we present an approach for the rational design of multispecific tandem trimerbodies with defined stoichiometry and controlled orientation. Using this technology we report here the construction and characterization of a tandem VHH-based trimerbody capable of simultaneously binding to three different antigens: carcinoembryonic antigen (CEA), epidermal growth factor receptor (EGFR) and green fluorescence protein (GFP). Multispecific tandem VHH-based trimerbodies were well expressed in mammalian cells, had good biophysical properties and were capable of simultaneously binding their targeted antigens. Importantly, these antibodies were very effective in inhibiting the proliferation of human epidermoid carcinoma A431 cells. Multispecific VHH-based trimerbodies are therefore ideal candidates for future applications in various therapeutic areas.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Alvarez-Cienfuegos A,Nuñez-Prado N,Compte M,Cuesta AM,Blanco-Toribio A,Harwood SL,Villate M,Merino N,Bonet J,Navarro R,Muñoz-Briones C,Sørensen KM,Mølgaard K,Oliva B,Sanz L,Blanco FJ,Alvarez-Vallina L

doi

10.1038/srep28643

subject

Has Abstract

pub_date

2016-06-27 00:00:00

pages

28643

issn

2045-2322

pii

srep28643

journal_volume

6

pub_type

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