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Journal of Biomolecular NMR

, Volume 61, Issue 3–4, pp 369–378 | Cite as

Transverse relaxation dispersion of the p7 membrane channel from hepatitis C virus reveals conformational breathing

  • Jyoti Dev
  • Sven Brüschweiler
  • Bo Ouyang
  • James J. ChouEmail author
Article

Abstract

The p7 membrane protein encoded by hepatitis C virus (HCV) assembles into a homo-hexamer that selectively conducts cations. An earlier solution NMR structure of the hexameric complex revealed a funnel-like architecture and suggests that a ring of conserved asparagines near the narrow end of the funnel are important for cation interaction. NMR based drug-binding experiments also suggest that rimantadine can allosterically inhibit ion conduction via a molecular wedge mechanism. These results suggest the presence of dilation and contraction of the funnel tip that are important for channel activity and that the action of the drug is attenuating this motion. Here, we determined the conformational dynamics and solvent accessibility of the p7 channel. The proton exchange measurements show that the cavity-lining residues are largely water accessible, consistent with the overall funnel shape of the channel. Our relaxation dispersion data show that residues Val7 and Leu8 near the asparagine ring are subject to large chemical exchange, suggesting significant intrinsic channel breathing at the tip of the funnel. Moreover, the hinge regions connecting the narrow and wide regions of the funnel show strong relaxation dispersion and these regions are the binding sites for rimantadine. Presence of rimantadine decreases the conformational dynamics near the asparagine ring and the hinge area. Our data provide direct observation of μs–ms dynamics of the p7 channel and support the molecular wedge mechanism of rimantadine inhibition of the HCV p7 channel.

Keywords

Membrane protein dynamics Viroporin HCV p7 

Notes

Acknowledgments

We thank Dr. Qin Yang and Dr. Kirill Oxenoid for helpful discussions, and Dr. Tanxing Cui for help with Sparky. S. B. is a recipient of an Erwin Schrödinger postdoctoral fellowship of the Austrian Science Fund (FWF, J3251). This work was supported by the NIH Grant GM094608 (to J. J. C.).

Supplementary material

10858_2015_9912_MOESM1_ESM.docx (511 kb)
Supplementary material 1 (DOCX 511 kb)

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Copyright information

© Springer Science+Business Media Dordrecht 2015

Authors and Affiliations

  • Jyoti Dev
    • 1
  • Sven Brüschweiler
    • 1
  • Bo Ouyang
    • 2
    • 3
  • James J. Chou
    • 1
    Email author
  1. 1.Department of Biological Chemistry and Molecular PharmacologyHarvard Medical SchoolBostonUSA
  2. 2.State Key Laboratory of Molecular Biology, Shanghai Institute of Biochemistry and Cell BiologyChinese Academy of SciencesShanghaiChina
  3. 3.National Center for Protein Science, Shanghai Institute of Biochemistry and Cell BiologyChinese Academy of SciencesShanghaiChina

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