9HY9 | pdb_00009hy9

Crystal structure of an allosteric inhibitor bound to human RIPK1 kinase domain


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.29 Å
  • R-Value Free: 
    0.275 (Depositor), 0.274 (DCC) 
  • R-Value Work: 
    0.217 (Depositor), 0.221 (DCC) 
  • R-Value Observed: 
    0.219 (Depositor) 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


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Literature

Allosteric targeting of RIPK1: discovery of novel inhibitors via parallel virtual screening and structure-guided optimization.

Vijayan, R.S.K.Hamilton, M.M.Pfaffinger, D.E.Alvarez, F.G.Reyna, N.J.Bardenhagen, J.P.Shepard, H.Rodriguez, C.Goodwani, S.Lightfoot, Y.Maskos, K.Johannsson, S.Kempf, G.Xu, Q.A.Neumann, L.Jiang, Y.Do, M.G.Jones, P.Lewis, R.T.Ray, W.J.Cross, J.B.

(2025) RSC Med Chem 

  • DOI: https://doi.org/10.1039/d5md00317b
  • Primary Citation of Related Structures:  
    9HY8, 9HY9

  • PubMed Abstract: 

    Receptor-interacting serine/threonine protein-kinase 1 (RIPK1) is a critical signalling protein that regulates inflammation and cell death in response to TNF signalling. Inhibiting RIPK1 kinase activity prevents neuronal cell death in various animal models, making it a promising therapeutic target for neurodegenerative, inflammatory, and autoimmune disorders. To identify novel allosteric RIPK1 inhibitors, we used a parallel virtual screening strategy that employed structure-based pharmacophore, shape-based, and fuzzy pharmacophore similarity approaches. Structure-guided optimization enabled by X-ray crystallography led to the discovery of a potent and selective piperidinecarboxamide inhibitor with an acceptable pharmacokinetic (PK) profile and limited brain exposure. This work highlights the effectiveness of virtual screening, followed by structure-guided optimization, in identifying progressible allosteric kinase inhibitors.


  • Organizational Affiliation
    • Institute for Applied Cancer Science, The University of Texas MD Anderson Cancer Center 1881 East Road Houston Texas 77054 USA jbcross@mdanderson.org.

Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Receptor-interacting serine/threonine-protein kinase 1
A, B
297Homo sapiensMutation(s): 4 
Gene Names: RIPK1RIPRIP1
EC: 2.7.11.1
UniProt & NIH Common Fund Data Resources
Find proteins for Q13546 (Homo sapiens)
Explore Q13546 
Go to UniProtKB:  Q13546
PHAROS:  Q13546
GTEx:  ENSG00000137275 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ13546
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
A1IX9 (Subject of Investigation/LOI)
Query on A1IX9

Download Ideal Coordinates CCD File 
C [auth A],
I [auth B]
~{N}-[(1~{S})-1-(2-chloranyl-6-fluoranyl-phenyl)ethyl]-4-fluoranyl-1-[2-fluoranyl-5-(1-methylpyrazol-4-yl)phenyl]carbonyl-piperidine-4-carboxamide
C25 H24 Cl F3 N4 O2
HLEDGKCLFTZSGP-HNNXBMFYSA-N
IOD
Query on IOD

Download Ideal Coordinates CCD File 
D [auth A]
E [auth A]
F [auth A]
G [auth A]
J [auth B]
D [auth A],
E [auth A],
F [auth A],
G [auth A],
J [auth B],
K [auth B],
L [auth B],
M [auth B],
N [auth B]
IODIDE ION
I
XMBWDFGMSWQBCA-UHFFFAOYSA-M
PEG
Query on PEG

Download Ideal Coordinates CCD File 
H [auth A]DI(HYDROXYETHYL)ETHER
C4 H10 O3
MTHSVFCYNBDYFN-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.29 Å
  • R-Value Free:  0.275 (Depositor), 0.274 (DCC) 
  • R-Value Work:  0.217 (Depositor), 0.221 (DCC) 
  • R-Value Observed: 0.219 (Depositor) 
Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 47.582α = 90
b = 98.129β = 90
c = 127.126γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XSCALEdata scaling
REFMACrefinement
PHASERphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Other private--

Revision History  (Full details and data files)

  • Version 1.0: 2025-12-24
    Type: Initial release