pH-induced conformational change of the influenza M2 protein C-terminal domain.

pH-induced conformational change of the influenza M2 protein C-terminal domain.
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DOI:
10.1021/bi801315m
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发表时间:
2008-09-23
期刊:
影响因子:
2.9
通讯作者:
Howard, Kathleen P.
Howard, Kathleen P.
中科院分区:
生物学3区
文献类型:
--
作者:
Nguyen, Phuong A.;Soto, Cinque S.;Polishchuk, Alexei;Caputo, Gregory A.;Tatko, Chad D.;Ma, Chunlong;Ohigashi, Yuki;Pinto, Lawrence H.;DeGrado, William F.;Howard, Kathleen P.

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来自甲型流感的M2蛋白是ph激活的质子通道,在病毒生命周期中发挥重要作用,并作为药物靶点。利用自旋标记EPR光谱,我们研究了一个38个残基的M2肽跨越跨膜区及其c端延伸。我们获得了9个连续的c端位点在高pH和低pH条件下的残基特异性环境参数。尽管四聚体内单体的排列随pH值的变化而变化,但该区域在高pH和低pH下都形成膜表面螺旋。电生理学和EPR数据都指出残基Lys 49的关键作用。
The M2 protein from influenza A is a pH-activated proton channel that plays an essential role in the viral life cycle and serves as a drug target. Using spin labeling EPR spectroscopy we studied a 38-residue M2 peptide spanning the transmembrane region and its C-terminal extension. We obtained residue-specific environmental parameters under both high and low pH conditions for nine consecutive C-terminal sites. The region forms a membrane surface helix at both high and low pH although the arrangement of the monomers within the tetramer changes with pH. Both electrophysiology and EPR data point to a critical role for residue Lys 49.
DOI: 10.1038/nature06528
发表时间: 2008-01-31
期刊: NATURE
影响因子: 64.8
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