What question did this study set out to answer?

To characterize the ion channel activity, drug sensitivity, and three-dimensional secondary structure of the monomeric hepatitis C virus p7 viroporin.

July 29, 2010Journal of Biological ChemistryOpen Access

NMR Structure and Ion Channel Activity of the p7 Protein from Hepatitis C Virus

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To characterize the ion channel activity, drug sensitivity, and three-dimensional secondary structure of the monomeric hepatitis C virus p7 viroporin.
Synthesized and purified p7 protein derived from hepatitis C virus genotype 1b (strain HCV-J).
Characterized ion channel activity, conductance, and pharmacological block using planar lipid bilayers and single-channel patch clamp electrophysiology.
Resolved secondary structure using circular dichroism, 1H and 13C NMR spectroscopy in trifluoroethanol/water mixtures, and molecular dynamics membrane simulations.
Demonstrated that p7 functions as a cation-selective ion channel that is inhibited by hexamethylene amiloride but insensitive to amantadine.
Observed that p7 adopts a predominantly α-helical conformation across various membrane mimetics, including lysolipids, detergents, and organic solvent/water systems.
Identified an unexpected N-terminal α-helix connected by a turn to transmembrane helix 1 (TM1), followed by a cytosolic loop bearing a dibasic motif linking to TM2.

Structured PICO

Population

Chemically synthesized p7 protein from Hepatitis C virus strain HCV-J (genotype 1b)

Intervention

Structural analysis (NMR, circular dichroism), ion channel activity measurements (planar lipid bilayers, patch clamp), and molecular dynamics simulations

Outcome

Secondary structure elements and three-dimensional model of the monomeric form of p7 associated with the phospholipid bilayersurrogate

The study provides the first detailed experimental structural framework of the HCV p7 protein, revealing its secondary structure and ion channel gating mechanism, which is relevant for antiviral drug development.

Authors

RMRoland MontserretUniversité Claude Bernard Lyon 1 NSNathalie SaintCentre National de la Recherche Scientifique CVChristophe VanbelleUniversité Claude Bernard Lyon 1

Discussion

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Implication

May inform HCV p7-targeted antivirals; leaves open clinical translation from animal data.

Cite This Study

Montserret et al. (2010) studied this question.

synapsesocial.com/papers/6a82a6fe68df11fa7b6d024a https://doi.org/10.1074/jbc.m110.122895

View Full Paper

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NMR Structure and Ion Channel Activity of the p7 Protein from Hepatitis C Virus

Key Points

Structured PICO

Discussion

Implication

Cite This Study

NMR Structure and Ion Channel Activity of the p7 Protein from Hepatitis C Virus

Key Points

Structured PICO

Discussion

Implication

Cite This Study

Also Consider

Also Consider