The heads of the measles virus attachment protein move to transmit the fusion-triggering signal.

The heads of the measles virus attachment protein move to transmit the fusion-triggering signal.
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DOI:
10.1038/nsmb.1967
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发表时间:
2011-02
影响因子:
16.8
通讯作者:
--
中科院分区:
生物学1区
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麻疹病毒进入系统由附着蛋白(血凝素,H)和融合蛋白组成,基于多种天然和靶向受体发挥作用。然而,触发病毒包膜与质膜融合的机制尚不清楚。在这里,我们测试了一个模型,考虑到H-二聚体的两个头部,这是共价连接在其基础上,结合两个受体分子后,相对于彼此移动,以传输融合触发信号。事实上,通过额外的分子间二硫键稳定H-二聚体界面阻止了膜融合,这一作用可被还原剂逆转。此外,膜锚定的指定受体有效地触发融合,只要它在接近天然受体结合的位置和远离H-二聚体界面的位置与H-二聚体接合。我们讨论了受体如何可能迫使H头转换合作伙伴和传输的融合触发信号。
The measles virus entry system, constituted of attachment (hemagglutinin, H) and fusion proteins, operates based on a variety of natural and targeted receptors. However, the mechanism triggering fusion of the viral envelope with the plasma membrane is not understood. Here we tested a model considering that the two heads of an H-dimer, which are covalently linked at their base, after binding two receptor molecules, move relative to each other to transmit the fusion-triggering signal. Indeed, stabilizing the H-dimer interface by additional inter-molecular disulfide bonds prevented membrane fusion, an effect reversed by a reducing agent. Moreover, a membrane-anchored designated receptor efficiently triggered fusion, provided it engaged the H-dimer at locations proximal to where the natural receptors bind, and distal to the H-dimer interface. We discuss how receptors may force H-heads to switch partners and transmit the fusion-triggering signal.
DOI: 10.1038/nrmicro1927
发表时间: 2008-07
期刊: Nature reviews. Microbiology
影响因子: --
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发表时间: 1993-03-01
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