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-Structure paper
タイトル | Hepatitis B virus core protein allosteric modulators can distort and disrupt intact capsids. |
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ジャーナル・号・ページ | Elife, Vol. 7, Year 2018 |
掲載日 | 2018年1月29日 |
著者 | Christopher John Schlicksup / Joseph Che-Yen Wang / Samson Francis / Balasubramanian Venkatakrishnan / William W Turner / Michael VanNieuwenhze / Adam Zlotnick / |
PubMed 要旨 | Defining mechanisms of direct-acting antivirals facilitates drug development and our understanding of virus function. Heteroaryldihydropyrimidines (HAPs) inappropriately activate assembly of ...Defining mechanisms of direct-acting antivirals facilitates drug development and our understanding of virus function. Heteroaryldihydropyrimidines (HAPs) inappropriately activate assembly of hepatitis B virus (HBV) core protein (Cp), suppressing formation of virions. We examined a fluorophore-labeled HAP, HAP-TAMRA. HAP-TAMRA induced Cp assembly and also bound pre-assembled capsids. Kinetic and spectroscopic studies imply that HAP-binding sites are usually not available but are bound cooperatively. Using cryo-EM, we observed that HAP-TAMRA asymmetrically deformed capsids, creating a heterogeneous array of sharp angles, flat regions, and outright breaks. To achieve high resolution reconstruction (<4 Å), we introduced a disulfide crosslink that rescued particle symmetry. We deduced that HAP-TAMRA caused quasi-sixfold vertices to become flatter and fivefold more angular. This transition led to asymmetric faceting. That a disordered crosslink could rescue symmetry implies that capsids have tensegrity properties. Capsid distortion and disruption is a new mechanism by which molecules like the HAPs can block HBV infection. |
リンク | Elife / PubMed:29377794 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 4.0 Å |
構造データ | |
化合物 | ChemComp-E9D: |
由来 |
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キーワード | VIRUS LIKE PARTICLE / capsid / CpAM / antiviral / fluorescent |