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Part of the book series: Current Topics in Microbiology and Immunology ((CT MICROBIOLOGY,volume 369))

Abstract

Great progress has been made over the past years in elucidating the structure and function of the hepatitis C virus (HCV) proteins, most of which are now actively being pursued as antiviral targets. The structural proteins, which form the viral particle, include the core protein and the envelope glycoproteins E1 and E2. The nonstructural proteins include the p7 viroporin, the NS2 protease, the NS3-4A complex harboring protease and NTPase/RNA helicase activities, the NS4B and NS5A proteins, and the NS5B RNA-dependent RNA polymerase. NS4B is a master organizer of replication complex formation while NS5A is a zinc-containing phosphoprotein involved in the regulation of HCV RNA replication versus particle production. Core to NS2 make up the assembly module while NS3 to NS5B represent the replication module (replicase). However, HCV proteins exert multiple functions during the viral life cycle, and these may be governed by different structural conformations and/or interactions with viral and/or cellular partners. Remarkably, each viral protein is anchored to intracellular membranes via specific determinants that are essential to protein function in the cell. This review summarizes current knowledge of the structure and function of the HCV proteins and highlights recent advances in the field.

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Abbreviations

aa:

Amino acid

AH:

Amphipathic α-helix

CHV:

Canine hepacivirus

CK:

Casein kinase

CsA:

Cyclosporin A

CypA:

Cyclophilin A

DHPC:

1,2-diheptanol-sn-glycero-3-phosphocholine

E:

Envelope glycoprotein

ER:

Endoplasmic reticulum

GBV-B:

GB virus B

HCV:

Hepatitis C virus

HVR:

Hypervariable region

igVR:

Intergenotypic variable domain

IRES:

Internal ribosome entry site

ISDR:

Interferon sensitivity determining region

LCS:

Low complexity sequence

LD:

Lipid droplet

MD:

Molecular dynamics

NCR:

Noncoding region

NMR:

Nuclear magnetic resonance

NS:

Nonstructural protein

ORF:

Open reading frame

PI4KIII:

Phosphatidylinositol 4-kinase III

PI4P:

Phosphatidylinositol 4-phosphate

POPC:

1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine

RdRp:

RNA-dependent RNA polymerase

SPP:

Signal peptide peptidase

TMD:

Transmembrane domain

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Acknowledgments

Research in the authors’ laboratories is supported by the Swiss National Science Foundation, the French Centre National de la Recherche Scientifique, and the French National Agency for Research on AIDS and Viral Hepatitis.

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Moradpour, D., Penin, F. (2013). Hepatitis C Virus Proteins: From Structure to Function. In: Bartenschlager, R. (eds) Hepatitis C Virus: From Molecular Virology to Antiviral Therapy. Current Topics in Microbiology and Immunology, vol 369. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-27340-7_5

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