8BLQ

Cryo-EM structure of the CODV-IL13-RefAb triple complex

Summary for 8BLQ

• Entry DOI: 10.2210/pdb8blq/pdb
• EMDB information: 16113
• Descriptor: CODV-Fab, heavy chain, CODV-Fab, light chain, RefAb, light chain, ... (5 entities in total)
• Functional Keywords: cytosolic, bispecific, fab, therapeutical, immune system
• Biological source: Homo sapiens; More
• Total number of polymer chains: 5
• Total formula weight: 130972.11

Authors

Fernandez-Martinez, D.,Kandiah, E. (deposition date: 2022-11-10, release date: 2023-06-07, Last modification date: 2024-11-13)

Primary citation

Fernandez-Martinez, D.,Tully, M.D.,Leonard, G.,Mathieu, M.,Kandiah, E.
Structural insights into the bi-specific cross-over dual variable antibody architecture by cryo-EM.
Sci Rep, 13:8694-8694, 2023

PubMed Abstract: Multi-specific antibodies (msAbs) are being developed as next generation antibody-based therapeutics. Knowledge of the three-dimensional structures, in the full antibody context, of their fragment antigen-binding (Fab) moieties with or without bound antigens is key to elucidating their therapeutic efficiency and stability. However, the flexibility of msAbs, a feature essential for their multi specificity, has hindered efforts in this direction. Cross-Over Dual Variable immunoglobulin (CODV) is a promising bispecific antibody format, designed to simultaneously target the interleukins IL4 and IL13. In this work we present the biophysical and structural characterisation of a CODV:IL13 complex in the full antibody context, using cryo-electron microscopy at an overall resolution of 4.2 Å. Unlike the 1:2 stoichiometry previously observed for CODV:IL4, CODV:IL13 shows a 1:1 stoichiometry. As well as providing details of the IL13-CODV binding interface, including the residues involved in the epitope-paratope region, the structure of CODV:IL13 also validates the use of labelling antibody as a new strategy for the single particle cryo-EM study of msAbs in complex with one, or more, antigens. This strategy reduced the inherent flexibility of the IL13 binding domain of CODV without inducing either structural changes at the epitope level or steric hindrance between the IL4 and IL13 binding regions of CODV. The work presented here thus also contributes to the development of methodology for the structural study of msAbs, a promising platform for cancer immunotherapy.

PubMed: 37248285
DOI: 10.1038/s41598-023-35678-4

Experimental method

ELECTRON MICROSCOPY (3.97 Å)