The Fk1 domain of FKBP51 in complex with iFit4

Experimental Data Snapshot

  • Resolution: 1.25 Å
  • R-Value Free: 0.174 
  • R-Value Work: 0.129 
  • R-Value Observed: 0.131 

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This is version 1.3 of the entry. See complete history


Selective inhibitors of the FK506-binding protein 51 by induced fit.

Gaali, S.Kirschner, A.Cuboni, S.Hartmann, J.Kozany, C.Balsevich, G.Namendorf, C.Fernandez-Vizarra, P.Sippel, C.Zannas, A.S.Draenert, R.Binder, E.B.Almeida, O.F.Ruhter, G.Uhr, M.Schmidt, M.V.Touma, C.Bracher, A.Hausch, F.

(2015) Nat Chem Biol 11: 33-37

  • DOI: https://doi.org/10.1038/nchembio.1699
  • Primary Citation of Related Structures:  
    4TW6, 4TW7, 4TW8

  • PubMed Abstract: 

    The FK506-binding protein 51 (FKBP51, encoded by the FKBP5 gene) is an established risk factor for stress-related psychiatric disorders such as major depression. Drug discovery for FKBP51 has been hampered by the inability to pharmacologically differentiate against the structurally similar but functional opposing homolog FKBP52, and all known FKBP ligands are unselective. Here, we report the discovery of the potent and highly selective inhibitors of FKBP51, SAFit1 and SAFit2. This new class of ligands achieves selectivity for FKBP51 by an induced-fit mechanism that is much less favorable for FKBP52. By using these ligands, we demonstrate that selective inhibition of FKBP51 enhances neurite elongation in neuronal cultures and improves neuroendocrine feedback and stress-coping behavior in mice. Our findings provide the structural and functional basis for the development of mechanistically new antidepressants.

  • Organizational Affiliation

    Department of Translational Research in Psychiatry, Max Planck Institute of Psychiatry, Munich, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Peptidyl-prolyl cis-trans isomerase FKBP5128Homo sapiensMutation(s): 1 
Gene Names: FKBP5AIG6FKBP51
UniProt & NIH Common Fund Data Resources
Find proteins for Q13451 (Homo sapiens)
Explore Q13451 
Go to UniProtKB:  Q13451
PHAROS:  Q13451
GTEx:  ENSG00000096060 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ13451
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on 37K

Download Ideal Coordinates CCD File 
B [auth A](1R)-3-(3,4-dimethoxyphenyl)-1-{3-[2-(morpholin-4-yl)ethoxy]phenyl}propyl (2S)-1-[(2S)-2-[(1S)-cyclohex-2-en-1-yl]-2-(3,4,5-trimethoxyphenyl)acetyl]piperidine-2-carboxylate
C46 H60 N2 O10
Binding Affinity Annotations 
IDSourceBinding Affinity
37K Binding MOAD:  4TW7 Ki: 26 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 1.25 Å
  • R-Value Free: 0.174 
  • R-Value Work: 0.129 
  • R-Value Observed: 0.131 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 49.262α = 90
b = 60.934β = 90
c = 38.059γ = 90
Software Package:
Software NamePurpose
SCALAdata scaling
PDB_EXTRACTdata extraction
XDSdata reduction
XSCALEdata reduction

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2014-11-26
    Type: Initial release
  • Version 1.1: 2014-12-10
    Changes: Database references
  • Version 1.2: 2014-12-24
    Changes: Database references
  • Version 1.3: 2023-12-20
    Changes: Data collection, Database references, Refinement description