A conserved immunogenic and vulnerable site on the coronavirus spike protein delineated by cross-reactive monoclonal antibodies

Chunyan Wang, Rien van Haperen, Javier Gutiérrez-Álvarez, Wentao Li, Nisreen M.A. Okba, Irina Albulescu, Ivy Widjaja, Brenda van Dieren, Raul Fernandez-Delgado, Isabel Sola, Daniel L. Hurdiss, Olalekan Daramola, Frank Grosveld, Frank J.M. van Kuppeveld, Bart L. Haagmans, Luis Enjuanes, Dubravka Drabek, B.J. Bosch*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

35 Citations (Scopus)

Abstract

The coronavirus spike glycoprotein, located on the virion surface, is the key mediator of cell entry and the focus for development of protective antibodies and vaccines. Structural studies show exposed sites on the spike trimer that might be targeted by antibodies with cross-species specificity. Here we isolated two human monoclonal antibodies from immunized humanized mice that display a remarkable cross-reactivity against distinct spike proteins of betacoronaviruses including SARS-CoV, SARS-CoV-2, MERS-CoV and the endemic human coronavirus HCoV-OC43. Both cross-reactive antibodies target the stem helix in the spike S2 fusion subunit which, in the prefusion conformation of trimeric spike, forms a surface exposed membrane-proximal helical bundle. Both antibodies block MERS-CoV infection in cells and provide protection to mice from lethal MERS-CoV challenge in prophylactic and/or therapeutic models. Our work highlights an immunogenic and vulnerable site on the betacoronavirus spike protein enabling elicitation of antibodies with unusual binding breadth.

Original languageEnglish
Article number1715
JournalNature Communications
Volume12
Issue number1
DOIs
Publication statusPublished - 17 Mar 2021

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