2FM2

HCV NS3-4A protease domain complexed with a ketoamide inhibitor, SCH446211


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.185 
  • R-Value Observed: 0.189 

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Ligand Structure Quality Assessment 


This is version 1.2 of the entry. See complete history


Literature

Mutations conferring resistance to SCH6, a novel hepatitis C virus NS3/4A protease inhibitor. Reduced RNA replication fitness and partial rescue by second-site mutations

Yi, M.Tong, X.Skelton, A.Chase, R.Chen, T.Prongay, A.Bogen, S.L.Saksena, A.K.Njoroge, F.G.Veselenak, R.L.Pyles, R.B.Bourne, N.Malcolm, B.A.Lemon, S.M.

(2006) J Biol Chem 281: 8205-8215

  • DOI: 10.1074/jbc.M510246200
  • Primary Citation of Related Structures:  
    2FM2

  • PubMed Abstract: 
  • Drug resistance is a major issue in the development and use of specific antiviral therapies. Here we report the isolation and characterization of hepatitis C virus RNA replicons resistant to a novel ketoamide inhibitor of the NS3/4A protease, SCH6 (originally SCH446211) ...

    Drug resistance is a major issue in the development and use of specific antiviral therapies. Here we report the isolation and characterization of hepatitis C virus RNA replicons resistant to a novel ketoamide inhibitor of the NS3/4A protease, SCH6 (originally SCH446211). Resistant replicon RNAs were generated by G418 selection in the presence of SCH6 in a dose-dependent fashion, with the emergence of resistance reduced at higher SCH6 concentrations. Sequencing demonstrated remarkable consistency in the mutations conferring SCH6 resistance in genotype 1b replicons derived from two different strains of hepatitis C virus, A156T/A156V and R109K. R109K, a novel mutation not reported previously to cause resistance to NS3/4A inhibitors, conferred moderate resistance only to SCH6. Structural analysis indicated that this reflects unique interactions of SCH6 with P'-side residues in the protease active site. In contrast, A156T conferred high level resistance to SCH6 and a related ketoamide, SCH503034, as well as BILN 2061 and VX-950. Unlike R109K, which had minimal impact on NS3/4A enzymatic function, A156T significantly reduced NS3/4A catalytic efficiency, polyprotein processing, and replicon fitness. However, three separate second-site mutations, P89L, Q86R, and G162R, were capable of partially reversing A156T-associated defects in polyprotein processing and/or replicon fitness, without significantly reducing resistance to the protease inhibitor.


    Organizational Affiliation

    Center for Hepatitis Research, Institute for Human Infections & Immunity, University of Texas Medical Branch, Galveston 77555-1019, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
NS3 protease/helicaseA, C200Hepacivirus CMutation(s): 0 
Gene Names: NS polyprotein
EC: 2.7.7.48 (UniProt), 3.4.21.98 (UniProt), 3.6.1.15 (UniProt), 3.6.4.13 (UniProt)
UniProt
Find proteins for Q9ELS8 (hepatitis C virus genotype 1a)
Explore Q9ELS8 
Go to UniProtKB:  Q9ELS8
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9ELS8
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
NS4a proteinB, D23N/AMutation(s): 0 
UniProt
Find proteins for Q9ELS8 (hepatitis C virus genotype 1a)
Explore Q9ELS8 
Go to UniProtKB:  Q9ELS8
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9ELS8
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
3BC
Query on 3BC

Download Ideal Coordinates CCD File 
G [auth A]TERT-BUTYL [(1S)-1-({(1R,2S,5S)-2-[(3S,10S)-3-(CYCLOPROPYLMETHYL)-12-METHYL-4,5,8,11-TETRAOXO-10-PHENYL-2,6,9,12-TETRAAZATRIDECAN-1 -OYL]-6,6-DIMETHYL-3-AZABICYCLO[3.1.0]HEX-3-YL}CARBONYL)-2,2-DIMETHYLPROPYL]CARBAMATE
C38 H56 N6 O8
WHFNHDUMWYGJDL-WYFABNACSA-N
 Ligand Interaction
BME
Query on BME

Download Ideal Coordinates CCD File 
F [auth A]BETA-MERCAPTOETHANOL
C2 H6 O S
DGVVWUTYPXICAM-UHFFFAOYSA-N
 Ligand Interaction
ZN
Query on ZN

Download Ideal Coordinates CCD File 
E [auth A],
H [auth C]
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
Binding Affinity Annotations 
IDSourceBinding Affinity
3BC PDBBind:  2FM2 Ki: 7 (nM) from 1 assay(s)
BindingDB:  2FM2 Ki: 3.8 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.185 
  • R-Value Observed: 0.189 
  • Space Group: H 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 224.909α = 90
b = 224.909β = 90
c = 75.402γ = 120
Software Package:
Software NamePurpose
HKL-2000data collection
SCALEPACKdata scaling
X-PLORmodel building
X-PLORrefinement
HKL-2000data reduction
X-PLORphasing

Structure Validation

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Ligand Structure Quality Assessment 



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-02-07
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance