Structural states of RORgt: X-ray elucidation of molecular mechanisms and binding interactions for natural and synthetic compounds

Experimental Data Snapshot

  • Resolution: 2.26 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.238 
  • R-Value Observed: 0.239 

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Structural States of ROR gamma t: X-ray Elucidation of Molecular Mechanisms and Binding Interactions for Natural and Synthetic Compounds.

Kallen, J.Izaac, A.Be, C.Arista, L.Orain, D.Kaupmann, K.Guntermann, C.Hoegenauer, K.Hintermann, S.

(2017) ChemMedChem 12: 1014-1021

  • DOI: https://doi.org/10.1002/cmdc.201700278
  • Primary Citation of Related Structures:  
    5NTI, 5NTK, 5NTN, 5NTP, 5NTQ, 5NTW, 5NU1

  • PubMed Abstract: 

    The T-cell-specific retinoic acid receptor (RAR)-related orphan receptor-γ (RORγt) is a key transcription factor for the production of pro-inflammatory Th17 cytokines, which are implicated in the pathogenesis of autoimmune diseases. Over the years, several structurally diverse RORγt inverse agonists have been reported, but combining high potency and good physicochemical properties has remained a challenging task. We recently reported a new series of inverse agonists based on an imidazopyridine core with good physicochemical properties and excellent selectivity. Herein we report eight new X-ray crystal structures for different classes of natural and synthetic compounds, including examples selected from the patent literature. Analysis of their respective binding modes revealed insight into the molecular mechanisms that lead to agonism, antagonism, or inverse agonism. We report new molecular mechanisms for RORγt agonism and propose a separation of the inverse agonists into two classes: those that act via steric clash and those that act via other mechanisms (for the latter, co-crystallization with a co-activator peptide and helix 12 in the agonist position is still possible). For the non-steric clash inverse agonists, we propose a new mechanism ("water trapping") which can be combined with other mechanisms (e.g., close contacts with H479). In addition, we compare the interactions made for selected compounds in the "back pocket" near S404 and in the "sulfate pocket" near R364 and R367. Taken together, these new mechanistic insights should prove useful for the design and optimization of further RORγt modulators.

  • Organizational Affiliation

    CBT, Novartis Institutes for BioMedical Research, Novartis Campus, 4002, Basel, Switzerland.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Nuclear receptor ROR-gamma
A, B
238Homo sapiensMutation(s): 1 
UniProt & NIH Common Fund Data Resources
Find proteins for P51449 (Homo sapiens)
Explore P51449 
Go to UniProtKB:  P51449
PHAROS:  P51449
GTEx:  ENSG00000143365 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP51449
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on 444

Download Ideal Coordinates CCD File 
C [auth A],
D [auth B]
C17 H12 F9 N O3 S
Binding Affinity Annotations 
IDSourceBinding Affinity
444 BindingDB:  5NTQ Ki: 51 (nM) from 1 assay(s)
IC50: min: 60, max: 6500 (nM) from 12 assay(s)
EC50: min: 54, max: 463 (nM) from 4 assay(s)
Binding MOAD:  5NTQ IC50: 33.8 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 2.26 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.238 
  • R-Value Observed: 0.239 
  • Space Group: P 61
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 99.748α = 90
b = 99.748β = 90
c = 124.392γ = 120
Software Package:
Software NamePurpose
XSCALEdata scaling
PDB_EXTRACTdata extraction
XDSdata reduction

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

  • Released Date: 2017-06-21 
  • Deposition Author(s): Kallen, J.

Revision History  (Full details and data files)

  • Version 1.0: 2017-06-21
    Type: Initial release
  • Version 1.1: 2017-07-19
    Changes: Database references
  • Version 1.2: 2024-01-17
    Changes: Data collection, Database references, Refinement description