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© Ahmed Haouz
Cristaux d'une protéine de Mycobacterium tuberculosis produits dans le cadre du Grand Programme Horizontal sur la Tuberculose à l'Institut Pasteur. La caractérisation structurale de protéines mycobactériennes aide à une meilleure compréhension de la physiologie et de la pathogénicité des mycobactéries et fournit un point de départ pour la conception de nouveaux agents antibactériens.
Publication : Nature communications

Covalently linked dengue virus envelope glycoprotein dimers reduce exposure of the immunodominant fusion loop epitope

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Nature communications - 23 May 2017

Rouvinski A, Dejnirattisai W, Guardado-Calvo P, Vaney MC, Sharma A, Duquerroy S, Supasa P, Wongwiwat W, Haouz A, Barba-Spaeth G, Mongkolsapaya J, Rey FA, Screaton GR

Link to Pubmed [PMID] – 28534525

Nat Commun 2017 May;8:15411

A problem in the search for an efficient vaccine against dengue virus is the immunodominance of the fusion loop epitope (FLE), a segment of the envelope protein E that is buried at the interface of the E dimers coating mature viral particles. Anti-FLE antibodies are broadly cross-reactive but poorly neutralizing, displaying a strong infection enhancing potential. FLE exposure takes place via dynamic ‘breathing’ of E dimers at the virion surface. In contrast, antibodies targeting the E dimer epitope (EDE), readily exposed at the E dimer interface over the region of the conserved fusion loop, are very potent and broadly neutralizing. We here engineer E dimers locked by inter-subunit disulfide bonds, and show by X-ray crystallography and by binding to a panel of human antibodies that these engineered dimers do not expose the FLE, while retaining the EDE exposure. These locked dimers are strong immunogen candidates for a next-generation vaccine.

https://www.ncbi.nlm.nih.gov/pubmed/28534525