The Jak1 kinase domain in complex with inhibitor

Experimental Data Snapshot

  • Resolution: 2.10 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.193 

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This is version 1.3 of the entry. See complete history


Novel triazolo-pyrrolopyridines as inhibitors of Janus kinase 1.

Hurley, C.A.Blair, W.S.Bull, R.J.Chang, C.Crackett, P.H.Deshmukh, G.Dyke, H.J.Fong, R.Ghilardi, N.Gibbons, P.Hewitt, P.R.Johnson, A.Johnson, T.Kenny, J.R.Kohli, P.B.Kulagowski, J.J.Liimatta, M.Lupardus, P.J.Maxey, R.J.Mendonca, R.Narukulla, R.Pulk, R.Ubhayakar, S.van Abbema, A.Ward, S.I.Waszkowycz, B.Zak, M.

(2013) Bioorg Med Chem Lett 23: 3592-3598

  • DOI: https://doi.org/10.1016/j.bmcl.2013.04.018
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The identification of a novel fused triazolo-pyrrolopyridine scaffold, optimized derivatives of which display nanomolar inhibition of Janus kinase 1, is described. Prototypical example 3 demonstrated lower cell potency shift, better permeability in cells and higher oral exposure in rat than the corresponding, previously reported, imidazo-pyrrolopyridine analogue 2. Examples 6, 7 and 18 were subsequently identified from an optimization campaign and demonstrated modest selectivity over JAK2, moderate to good oral bioavailability in rat with overall pharmacokinetic profiles comparable to that reported for an approved pan-JAK inhibitor (tofacitinib).

  • Organizational Affiliation

    Department of Medicinal Chemistry, Argenta, 8/9 Spire Green Centre, Harlow, Essex CM19 5TR, United Kingdom. Chris.Hurley@glpg.com

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Tyrosine-protein kinase JAK1
A, B
302Homo sapiensMutation(s): 0 
Gene Names: JAK1JAK1AJAK1B
UniProt & NIH Common Fund Data Resources
Find proteins for P23458 (Homo sapiens)
Explore P23458 
Go to UniProtKB:  P23458
PHAROS:  P23458
GTEx:  ENSG00000162434 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP23458
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on PTR
A, B
Binding Affinity Annotations 
IDSourceBinding Affinity
C5I PDBBind:  4I5C Ki: 1.5 (nM) from 1 assay(s)
BindingDB:  4I5C Ki: 1.5 (nM) from 1 assay(s)
EC50: 114 (nM) from 1 assay(s)
Binding MOAD:  4I5C Ki: 1.5 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 2.10 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.193 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 42.7α = 90
b = 173.969β = 94.11
c = 44.675γ = 90
Software Package:
Software NamePurpose
Blu-Icedata collection
XDSdata reduction
SCALAdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-05-22
    Type: Initial release
  • Version 1.1: 2013-06-12
    Changes: Database references
  • Version 1.2: 2023-09-20
    Changes: Data collection, Database references, Derived calculations, Refinement description
  • Version 1.3: 2023-12-06
    Changes: Data collection