Solution Structure of KKGF

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 27 
  • Selection Criteria: structures with the least restraint violations 

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This is version 1.3 of the entry. See complete history


Structural analysis of hepatitis C virus core-e1 signal Peptide and requirements for cleavage of the genotype 3a signal sequence by signal Peptide peptidase.

Oehler, V.Filipe, A.Montserret, R.da Costa, D.Brown, G.Penin, F.McLauchlan, J.

(2012) J Virol 86: 7818-7828

  • DOI: https://doi.org/10.1128/JVI.00457-12
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The maturation of the hepatitis C virus (HCV) core protein requires proteolytic processing by two host proteases: signal peptidase (SP) and the intramembrane-cleaving protease signal peptide peptidase (SPP). Previous work on HCV genotype 1a (GT1a) and GT2a has identified crucial residues required for efficient signal peptide processing by SPP, which in turn has an effect on the production of infectious virus particles. Here we demonstrate that the JFH1 GT2a core-E1 signal peptide can be adapted to the GT3a sequence without affecting the production of infectious HCV. Through mutagenesis studies, we identified crucial residues required for core-E1 signal peptide processing, including a GT3a sequence-specific histidine (His) at position 187. In addition, the stable knockdown of intracellular SPP levels in HuH-7 cells significantly affects HCV virus titers, further demonstrating the requirement for SPP for the maturation of core and the production of infectious HCV particles. Finally, our nuclear magnetic resonance (NMR) structural analysis of a synthetic HCV JFH1 GT2a core-E1 signal peptide provides an essential structural template for a further understanding of core processing as well as the first model for an SPP substrate within its membrane environment. Our findings give deeper insights into the mechanisms of intramembrane-cleaving proteases and the impact on viral infections.

  • Organizational Affiliation

    MRC-University of Glasgow Centre for Virus Research, Glasgow, United Kingdom.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Core protein p2127Hepatitis C virus JFH-1Mutation(s): 0 
Membrane Entity: Yes 
Find proteins for Q99IB8 (Hepatitis C virus genotype 2a (isolate JFH-1))
Explore Q99IB8 
Go to UniProtKB:  Q99IB8
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ99IB8
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 27 
  • Selection Criteria: structures with the least restraint violations 

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-07-11
    Type: Initial release
  • Version 1.1: 2012-07-25
    Changes: Database references
  • Version 1.2: 2023-06-14
    Changes: Data collection, Database references, Other
  • Version 1.3: 2024-05-15
    Changes: Data collection, Database references