Structural evaluation of EGFR inhibition mechanisms for nanobodies/VHH domains.
Structural evaluation of EGFR inhibition mechanisms for nanobodies/VHH domains.
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DOI:
10.1016/j.str.2013.05.008
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发表时间:
2013-07-02
期刊:
影响因子:
5.7
通讯作者:
Ferguson, Kathryn M.
中科院分区:
文献类型:
--
作者:
Schmitz, Karl R.;Bagchi, Atrish;Roovers, Rob C.;Henegouwen, Paul M. P. van Bergen En;Ferguson, Kathryn M.
The epidermal growth factor receptor (EGFR) is implicated in human cancers and is the target of several classes of therapeutic agents, including antibody-based drugs. Here, we describe X-ray crystal structures of the extracellular region of EGFR in complex with three inhibitory VHH domains or nanobodies. VHH domains, the smallest natural antigen-binding modules, are readily engineered for diagnostic and therapeutic applications. All three VHH domains prevent ligand-induced EGFR activation, but use two distinct mechanisms. 7D12 sterically blocks ligand binding to EGFR in a manner similar to cetuximab. EgA1 and 9G8 bind an epitope near the EGFR domain II/III junction preventing receptor conformational changes required for high-affinity ligand binding and dimerization. This epitope is accessible to the convex VHH paratope, but inaccessible to the flatter paratope of monoclonal antibodies. Appreciating the modes of binding and inhibition of these VHH domains will aid in their development for tumor imaging and/or cancer therapy.
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影响因子:
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DOI:
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期刊:
Acta crystallographica. Section D, Biological crystallography
影响因子:
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