A cocrystal structure of dengue capsid protein in complex of inhibitor

Proceedings of the National Academy of Sciences of the United States of America
Hongjie XiaPei-Yong Shi

Abstract

Dengue virus (DENV) was designated as a top 10 public health threat by the World Health Organization in 2019. No clinically approved anti-DENV drug is currently available. Here we report the high-resolution cocrystal structure (1.5 Å) of the DENV-2 capsid protein in complex with an inhibitor that potently suppresses DENV-2 but not other DENV serotypes. The inhibitor induces a "kissing" interaction between two capsid dimers. The inhibitor-bound capsid tetramers are assembled inside virions, resulting in defective uncoating of nucleocapsid when infecting new cells. Resistant DENV-2 emerges through one mutation that abolishes hydrogen bonds in the capsid structure, leading to a loss of compound binding. Structure-based analysis has defined the amino acids responsible for the inhibitor's inefficacy against other DENV serotypes. The results have uncovered an antiviral mechanism through inhibitor-induced tetramerization of the viral capsid and provided essential structural and functional knowledge for rational design of panserotype DENV capsid inhibitors.

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Citations

Mar 16, 2021·Current Opinion in Virology·Thais C Neves-MartinsAndrea T Da Poian
Jul 19, 2021·European Journal of Medicinal Chemistry·Igor José Dos Santos NascimentoEdeildo Ferreira da Silva-Júnior

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