1C2P image
Entry Detail
PDB ID:
1C2P
Keywords:
Title:
HEPATITIS C VIRUS NS5B RNA-DEPENDENT RNA POLYMERASE
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
1999-07-26
Release Date:
2000-04-05
Method Details:
Experimental Method:
Resolution:
1.90 Å
R-Value Free:
0.25
R-Value Work:
0.21
R-Value Observed:
0.21
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:RNA-DEPENDENT RNA POLYMERASE
Chain IDs:A, B
Chain Length:576
Number of Molecules:2
Biological Source:Hepatitis C virus
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
MSE A MET SELENOMETHIONINE
Primary Citation
Crystal structure of the RNA-dependent RNA polymerase from hepatitis C virus reveals a fully encircled active site.
Nat.Struct.Biol. 6 937 943 (1999)
PMID: 10504728 DOI: 10.1038/13305

Abstact

Various classes of nucleotidyl polymerases with different transcriptional roles contain a conserved core structure. Less is known, however, about the distinguishing features of these enzymes, particularly those of the RNA-dependent RNA polymerase class. The 1. 9 A resolution crystal structure of hepatitis C virus (HCV) nonstructural protein 5B (NS5B) presented here provides the first complete and detailed view of an RNA-dependent RNA polymerase. While canonical polymerase features exist in the structure, NS5B adopts a unique shape due to extensive interactions between the fingers and thumb polymerase subdomains that serve to encircle the enzyme active site. Several insertions in the fingers subdomain account for intersubdomain linkages that include two extended loops and a pair of antiparallel alpha-helices. The HCV NS5B apoenzyme structure reported here can accommodate a template:primer duplex without global conformational changes, supporting the hypothesis that this structure is essentially preserved during the reaction pathway. This NS5B template:primer model also allows identification of a new structural motif involved in stabilizing the nascent base pair.

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Primary Citation of related structures