4QPS

Crystal structure of Jak3 complexed to N-[3-(6-Phenylamino-pyrazin-2-yl)-3H-benzoimidazol-5-yl]-acrylamide

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.251 
  • R-Value Work: 0.207 
  • R-Value Observed: 0.210 

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Literature

Tricyclic Covalent Inhibitors Selectively Target Jak3 through an Active Site Thiol.

Goedken, E.R., Argiriadi, M.A., Banach, D.L., Fiamengo, B.A., Foley, S.E., Frank, K.E., George, J.S., Harris, C.M., Hobson, A.D., Ihle, D.C., Marcotte, D., Merta, P.J., Michalak, M.E., Murdock, S.E., Tomlinson, M.J., Voss, J.W.

(2015) J Biol Chem 290: 4573-4589

  • DOI: 10.1074/jbc.M114.595181
  • Primary Citation of Related Structures:  
    4QPS

  • PubMed Abstract: 

    • The action of Janus kinases (JAKs) is required for multiple cytokine signaling pathways, and as such, JAK inhibitors hold promise for treatment of autoimmune disorders, including rheumatoid arthritis, inflammatory bowel disease, and psoriasis. However, due to high similarity in the active sites of the four members (Jak1, Jak2, Jak3, and Tyk2), developing selective inhibitors within this family is challenging ...

    The action of Janus kinases (JAKs) is required for multiple cytokine signaling pathways, and as such, JAK inhibitors hold promise for treatment of autoimmune disorders, including rheumatoid arthritis, inflammatory bowel disease, and psoriasis. However, due to high similarity in the active sites of the four members (Jak1, Jak2, Jak3, and Tyk2), developing selective inhibitors within this family is challenging. We have designed and characterized substituted, tricyclic Jak3 inhibitors that selectively avoid inhibition of the other JAKs. This is accomplished through a covalent interaction between an inhibitor containing a terminal electrophile and an active site cysteine (Cys-909). We found that these ATP competitive compounds are irreversible inhibitors of Jak3 enzyme activity in vitro. They possess high selectivity against other kinases and can potently (IC50 < 100 nm) inhibit Jak3 activity in cell-based assays. These results suggest irreversible inhibitors of this class may be useful selective agents, both as tools to probe Jak3 biology and potentially as therapies for autoimmune diseases.

    Organizational Affiliation: 

    From the AbbVie Bioresearch Center, Worcester, Massachusetts 01605.



Macromolecules
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(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Tyrosine-protein kinase JAK3A,
B [auth C]		293Homo sapiensMutation(s): 3 
Gene Names: JAK3
EC: 2.7.10.2
UniProt & NIH Common Fund Data Resources
Find proteins for P52333 (Homo sapiens)
Explore P52333 
Go to UniProtKB:  P52333
PHAROS:  P52333
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP52333
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
37Q
Query on 37Q
Download Ideal Coordinates CCD File 
C [auth A],
D [auth C]		N-{1-[6-(phenylamino)pyrazin-2-yl]-1H-benzimidazol-6-yl}prop-2-enamide
C20 H16 N6 O
CVFYLUGNOLKEFO-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.251 
  • R-Value Work: 0.207 
  • R-Value Observed: 0.210 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 79.511α = 90
b = 43.877β = 115.26
c = 81.695γ = 90
Software Package:
Software NamePurpose
JDirectordata collection
PHASERphasing
BUSTERrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Ligand Structure Quality Assessment 


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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-01-14
    Type: Initial release
  • Version 1.1: 2015-03-11
    Changes: Database references