TMEM106B is a receptor mediating ACE2-independent SARS-CoV-2 cell entry
TMEM106B is a receptor mediating ACE2-independent SARS-CoV-2 cell entry
SARS-CoV-2 is associated with broad tissue tropism, a characteristic often determined by the availability of entry receptors on host cells. Here, we show that TMEM106B, a lysosomal transmembrane protein, can serve as an alternative receptor for SARS-CoV-2 entry into angiotensin-converting enzyme 2 (ACE2)-negative cells. Spike substitution E484D increased TMEM106B binding, thereby enhancing TMEM106B-mediated entry. TMEM106B-specific monoclonal antibodies blocked SARS-CoV-2 infection, demonstrating a role of TMEM106B in viral entry. Using X-ray crystallography, cryogenic electron microscopy (cryo-EM), and hydrogen-deuterium exchange mass spectrometry (HDX-MS), we show that the luminal domain (LD) of TMEM106B engages the receptor-binding motif of SARS-CoV-2 spike. Finally, we show that TMEM106B promotes spike-mediated syncytium formation, suggesting a role of TMEM106B in viral fusion. Together, our findings identify an ACE2-independent SARS-CoV-2 infection mechanism that involves cooperative interactions with the receptors heparan sulfate and TMEM106B.
ACE2-independent entry, SARS-CoV-2, TMEM106B, TMEM106B crystal structure, antibody neutralization, coronavirus, cryo-EM, entry receptor
3427-3442.e22
Baggen, Jim
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Franco-Hernandez, Natalia
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3 August 2023
Baggen, Jim
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Jacquemyn, Maarten
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Persoons, Leentje
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Calvaresi, Valeria
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Wrobel, Antoni G
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Martin, Stephen R
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Roustan, Chloë
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Cronin, Nora B
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Reading, Eamonn
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Thibaut, Hendrik Jan
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Vercruysse, Thomas
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Maes, Piet
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De Smet, Frederik
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Yee, Angie
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Nivitchanyong, Toey
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Roell, Marina
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Rhinn, Herve
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Ah Young-Chapon, Maxime
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Brown, Eric
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Cherepanov, Peter
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Daelemans, Dirk
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