1R7D image
Deposition Date 2003-10-21
Release Date 2004-08-10
Last Version Date 2024-05-22
Entry Detail
PDB ID:
1R7D
Title:
NMR structure of the membrane anchor domain (1-31) of the nonstructural protein 5A (NS5A) of hepatitis C virus (Ensemble of 51 structures, sample in 50% tfe)
Biological Source:
Source Organism:
(Taxon ID: )
Method Details:
Experimental Method:
Conformers Calculated:
100
Conformers Submitted:
51
Selection Criteria:
structures with the least restraint violations
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Genome polyprotein
Chain IDs:A
Chain Length:31
Number of Molecules:1
Biological Source:
Ligand Molecules
Primary Citation
Structure and function of the membrane anchor domain of hepatitis C virus nonstructural protein 5A.
J.Biol.Chem. 279 40835 40843 (2004)
PMID: 15247283 DOI: 10.1074/jbc.M404761200

Abstact

Hepatitis C virus (HCV) nonstructural protein 5A (NS5A) is a membrane-associated, essential component of the viral replication complex. Here, we report the three-dimensional structure of the membrane anchor domain of NS5A as determined by NMR spectroscopy. An alpha-helix extending from amino acid residue 5 to 25 was observed in the presence of different membrane mimetic media. This helix exhibited a hydrophobic, Trprich side embedded in detergent micelles, while the polar, charged side was exposed to the solvent. Thus, the NS5A membrane anchor domain forms an in-plane amphipathic alpha-helix embedded in the cytosolic leaflet of the membrane bilayer. Interestingly, mutations affecting the positioning of fully conserved residues located at the cytosolic surface of the helix impaired HCV RNA replication without interfering with the membrane association of NS5A. In conclusion, the NS5A membrane anchor domain constitutes a unique platform that is likely involved in specific interactions essential for the assembly of the HCV replication complex and that may represent a novel target for antiviral intervention.

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Primary Citation of related structures