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.
中科院分区:
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.
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.
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