3FQK

Hepatitis C virus polymerase NS5B (BK 1-570) with HCV-796 inhibitor


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.209 
  • R-Value Observed: 0.212 

wwPDB Validation   3D Report Full Report


Ligand Structure Quality Assessment 


This is version 1.1 of the entry. See complete history


Literature

Slow binding inhibition and mechanism of resistance of non-nucleoside polymerase inhibitors of hepatitis C virus.

Hang, J.Q.Yang, Y.Harris, S.F.Leveque, V.Whittington, H.J.Rajyaguru, S.Ao-Ieong, G.McCown, M.F.Wong, A.Giannetti, A.M.Le Pogam, S.Talamas, F.Cammack, N.Najera, I.Klumpp, K.

(2009) J Biol Chem 284: 15517-15529

  • DOI: 10.1074/jbc.M808889200
  • Primary Citation of Related Structures:  
    3FQK, 3FQL

  • PubMed Abstract: 
  • The binding affinity of four palm and thumb site representative non-nucleoside inhibitors (NNIs) of HCV polymerase NS5B to wild-type and resistant NS5B polymerase proteins was determined, and the influence of RNA binding on NNI binding affinity was investigated ...

    The binding affinity of four palm and thumb site representative non-nucleoside inhibitors (NNIs) of HCV polymerase NS5B to wild-type and resistant NS5B polymerase proteins was determined, and the influence of RNA binding on NNI binding affinity was investigated. NNIs with high binding affinity potently inhibited HCV RNA polymerase activity and replicon replication. Among the compounds tested, HCV-796 showed slow binding kinetics to NS5B. The binding affinity of HCV-796 to NS5B increased 27-fold over a 3-h incubation period with an equilibrium Kd of 71 +/- 2 nm. Slow binding kinetics of HCV-796 was driven by slow dissociation from NS5B with a k(off) of 4.9 +/- 0.5 x 10(-4) s(-1). NS5B bound a long, 378-nucleotide HCV RNA oligonucleotide with high affinity (Kd = 6.9 +/- 0.3 nm), whereas the binding affinity was significantly lower for a short, 21-nucleotide RNA (Kd = 155.1 +/- 16.2 nm). The formation of the NS5B-HCV RNA complex did not affect the slow binding kinetics profile and only slightly reduced NS5B binding affinity of HCV-796. The magnitude of reduction of NNI binding affinity for the NS5B proteins with various resistance mutations in the palm and thumb binding sites correlated well with resistance -fold shifts in NS5B polymerase activity and replicon assays. Co-crystal structures of NS5B-Con1 and NS5B-BK with HCV-796 revealed a deep hydrophobic binding pocket at the palm region of NS5B. HCV-796 interaction with the induced binding pocket on NS5B is consistent with slow binding kinetics and loss of binding affinity with mutations at amino acid position 316.


    Organizational Affiliation

    Roche Palo Alto LLC, Palo Alto, California 94304, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
RNA-directed RNA polymeraseA, B576Hepatitis C virus (isolate BK)Mutation(s): 0 
Gene Names: POL
EC: 2.7.7.48 (PDB Primary Data), 3.4.22 (UniProt), 3.4.21.98 (UniProt), 3.6.1.15 (UniProt), 3.6.4.13 (UniProt)
UniProt
Find proteins for P26663 (Hepatitis C virus genotype 1b (isolate BK))
Explore P26663 
Go to UniProtKB:  P26663
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
79Z (Subject of Investigation/LOI)
Query on 79Z

Download Ideal Coordinates CCD File 
C [auth A], D [auth B]5-cyclopropyl-2-(4-fluorophenyl)-6-[(2-hydroxyethyl)(methylsulfonyl)amino]-N-methyl-1-benzofuran-3-carboxamide
C22 H23 F N2 O5 S
WTDWVLJJJOTABN-UHFFFAOYSA-N
 Ligand Interaction
Binding Affinity Annotations 
IDSourceBinding Affinity
79Z PDBBind:  3FQK IC50: 81 (nM) from 1 assay(s)
Binding MOAD:  3FQK IC50: 81 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.209 
  • R-Value Observed: 0.212 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 86.287α = 90
b = 106.2β = 90
c = 125.94γ = 90
Software Package:
Software NamePurpose
Blu-Icedata collection
MOLREPphasing
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report



Ligand Structure Quality Assessment  



Entry History 

Deposition Data

  • Deposited Date: 2009-01-07 
  • Released Date: 2009-02-24 
  • Deposition Author(s): Harris, S.F., Wong, A.

Revision History  (Full details and data files)

  • Version 1.0: 2009-02-24
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance