期刊
BIOPHYSICAL JOURNAL
卷 93, 期 1, 页码 276-283出版社
CELL PRESS
DOI: 10.1529/biophysj.106.102103
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- NIAID NIH HHS [AI23007, R01 AI023007, R01 AI073891] Funding Source: Medline
The M-2 proton channel plays a vital role in the life cycle of the in. uenza A virus. His(37), the key residue in the M-2 transmembrane domain (M-2-TMD), plays a central role in the proton conductance mechanism. The anti-influenza drug, amantadine, inhibits the channel activity through binding to the pore of the M-2 channel. The nuclear spin relaxation data and polarization inversion spin exchange at the magic angle spectra show that both the polypeptide backbone and His(37) side chain are more constrained in the presence of amantadine. Using 15 N-15 cross polarization magic-angle spinning NMR spectroscopy, the protonation of His(37) of M-2-TMD in lipid bilayers was monitored in the absence and presence of amantadine as a function of pH. Binding amantadine lowers the His(37) pK(a) values by approximately three orders of magnitude compared with the first pKa of histidine in amantadine-free M-2-TMD. Amantadine's influence on the His 37 chemical properties suggests a novel mechanism by which amantadine may inhibit proton conductance.
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