Structural basis of TMPRSS2 zymogen activation and recognition by the HKU1 seasonal coronavirus.
Cell
; 187(16): 4246-4260.e16, 2024 Aug 08.
Article
em En
| MEDLINE
| ID: mdl-38964326
ABSTRACT
The human seasonal coronavirus HKU1-CoV, which causes common colds worldwide, relies on the sequential binding to surface glycans and transmembrane serine protease 2 (TMPRSS2) for entry into target cells. TMPRSS2 is synthesized as a zymogen that undergoes autolytic activation to process its substrates. Several respiratory viruses, in particular coronaviruses, use TMPRSS2 for proteolytic priming of their surface spike protein to drive membrane fusion upon receptor binding. We describe the crystal structure of the HKU1-CoV receptor binding domain in complex with TMPRSS2, showing that it recognizes residues lining the catalytic groove. Combined mutagenesis of interface residues and comparison across species highlight positions 417 and 469 as determinants of HKU1-CoV host tropism. The structure of a receptor-blocking nanobody in complex with zymogen or activated TMPRSS2 further provides the structural basis of TMPRSS2 activating conformational change, which alters loops recognized by HKU1-CoV and dramatically increases binding affinity.
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Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Serina Endopeptidases
Limite:
Animals
/
Humans
Idioma:
En
Revista:
Cell
Ano de publicação:
2024
Tipo de documento:
Article
País de afiliação:
França