Crystal structure, conformational fixation and entry-related interactions of mature ligand-free HIV-1 Env.
Nat Struct Mol Biol
; 22(7): 522-31, 2015 Jul.
Article
em En
| MEDLINE
| ID: mdl-26098315
ABSTRACT
As the sole viral antigen on the HIV-1-virion surface, trimeric Env is a focus of vaccine efforts. Here we present the structure of the ligand-free HIV-1-Env trimer, fix its conformation and determine its receptor interactions. Epitope analyses revealed trimeric ligand-free Env to be structurally compatible with broadly neutralizing antibodies but not poorly neutralizing ones. We coupled these compatibility considerations with binding antigenicity to engineer conformationally fixed Envs, including a 201C 433C (DS) variant specifically recognized by broadly neutralizing antibodies. DS-Env retained nanomolar affinity for the CD4 receptor, with which it formed an asymmetric intermediate a closed trimer bound by a single CD4 without the typical antigenic hallmarks of CD4 induction. Antigenicity-guided structural design can thus be used both to delineate mechanism and to fix conformation, with DS-Env trimers in virus-like-particle and soluble formats providing a new generation of vaccine antigens.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Anticorpos Anti-HIV
/
Infecções por HIV
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HIV-1
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Produtos do Gene env do Vírus da Imunodeficiência Humana
/
Anticorpos Neutralizantes
Limite:
Humans
Idioma:
En
Ano de publicação:
2015
Tipo de documento:
Article