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Mechanism of Enhanced Immature Dengue Virus Attachment to Endosomal Membrane Induced by prM Antibody.
Structure ( IF 4.4 ) Pub Date : 2018-11-21 , DOI: 10.1016/j.str.2018.10.009
Melissa Wirawan 1 , Guntur Fibriansah 1 , Jan K Marzinek 2 , Xin Xiang Lim 3 , Thiam-Seng Ng 1 , Adelene Y L Sim 4 , Qian Zhang 1 , Victor A Kostyuchenko 1 , Jian Shi 5 , Scott A Smith 6 , Chandra S Verma 7 , Ganesh Anand 3 , James E Crowe 8 , Peter J Bond 2 , Shee-Mei Lok 1
Affiliation  

Dengue virus (DENV) particles are released from cells in different maturation states. Fully immature DENV (immDENV) is generally non-infectious, but can become infectious when complexed with anti-precursor membrane (prM) protein antibodies. It is unknown how anti-prM antibody-coated particles can undergo membrane fusion since the prM caps the envelope (E) protein fusion loop. Here, we determined cryoelectron microscopy (cryo-EM) maps of the immDENV:anti-prM complex at different pH values, mimicking the extracellular (pH 8.0) or endosomal (pH 5.0) environments. At pH 5.0, there are two structural classes with fewer antibodies bound than at pH 8.0. These classes may represent different maturation states. Molecular simulations, together with the measured high-affinity pr:antibody interaction (versus the weak pr:E interaction) and also the low pH cryo-EM structures, suggest how antibody:pr complex can dislodge from the E protein at low pH. This exposes the E protein fusion loop enhancing virus interaction with endosomes.

中文翻译:

prM抗体诱导未成熟登革热病毒附着于内膜的机制。

登革病毒(DENV)颗粒从处于不同成熟状态的细胞中释放出来。完全不成熟的DENV(immDENV)通常是非传染性的,但与抗前体膜(prM)蛋白抗体复合时会变得具有传染性。未知的是,由于prM覆盖了包膜(E)蛋白融合环,因此抗prM抗体包被的颗粒如何进行膜融合。在这里,我们确定了在不同pH值下模仿细胞外(pH 8.0)或内体(pH 5.0)环境的immDENV:anti-prM复合物的冷冻电子显微镜(cryo-EM)图。在pH 5.0时,有两种结构类别的抗体结合量少于在pH 8.0时。这些类别可能代表不同的成熟状态。分子模拟以及测得的高亲和性pr:抗体相互作用(相对于弱pr:E相互作用)以及低pH值的冷冻EM结构,表明抗体:pr复合物如何在低pH值下从E蛋白中移出。这暴露了E蛋白融合环,增强了病毒与内体的相互作用。
更新日期:2019-02-26
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