6TLC

Unphosphorylated human STAT3 in complex with MS3-6 monobody

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.90 Å
  • R-Value Free: 0.281 
  • R-Value Work: 0.246 
  • R-Value Observed: 0.248 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history. 


Literature

Selective inhibition of STAT3 signaling using monobodies targeting the coiled-coil and N-terminal domains.

La Sala, G., Michiels, C., Kukenshoner, T., Brandstoetter, T., Maurer, B., Koide, A., Lau, K., Pojer, F., Koide, S., Sexl, V., Dumoutier, L., Hantschel, O.

(2020) Nat Commun 11: 4115-4115

  • DOI: 10.1038/s41467-020-17920-z
  • Primary Citation of Related Structures:  
    6TLC

  • PubMed Abstract: 

    • The transcription factor STAT3 is frequently activated in human solid and hematological malignancies and remains a challenging therapeutic target with no approved drugs to date. Here, we develop synthetic antibody mimetics, termed monobodies, to interfere with STAT3 signaling ...

    The transcription factor STAT3 is frequently activated in human solid and hematological malignancies and remains a challenging therapeutic target with no approved drugs to date. Here, we develop synthetic antibody mimetics, termed monobodies, to interfere with STAT3 signaling. These monobodies are highly selective for STAT3 and bind with nanomolar affinity to the N-terminal and coiled-coil domains. Interactome analysis detects no significant binding to other STATs or additional off-target proteins, confirming their exquisite specificity. Intracellular expression of monobodies fused to VHL, an E3 ubiquitin ligase substrate receptor, results in degradation of endogenous STAT3. The crystal structure of STAT3 in complex with monobody MS3-6 reveals bending of the coiled-coil domain, resulting in diminished DNA binding and nuclear translocation. MS3-6 expression strongly inhibits STAT3-dependent transcriptional activation and disrupts STAT3 interaction with the IL-22 receptor. Therefore, our study establishes innovative tools to interfere with STAT3 signaling by different molecular mechanisms.

    Organizational Affiliation: 

    Faculty of Medicine, Institute of Physiological Chemistry, Philipps-University of Marburg, Karl-von-Frisch-Straße 1, 35032, Marburg, Germany. oliver.hantschel@uni-marburg.de.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Signal transducer and activator of transcription 3B [auth A],
A [auth B]		598Homo sapiensMutation(s): 0 
Gene Names: STAT3, APRF
UniProt & NIH Common Fund Data Resources
Find proteins for P40763 (Homo sapiens)
Explore P40763 
Go to UniProtKB:  P40763
PHAROS:  P40763
GTEx:  ENSG00000168610 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP40763
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
MonobodyD [auth C],
C [auth D]		95Homo sapiensMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.90 Å
  • R-Value Free: 0.281 
  • R-Value Work: 0.246 
  • R-Value Observed: 0.248 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 111.31α = 90
b = 111.31β = 90
c = 483.467γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
European Research Council (ERC)SwitzerlandERC-2016-CoG 682311-ONCOINTRABODY

Revision History  (Full details and data files)

  • Version 1.0: 2020-07-22
    Type: Initial release
  • Version 1.1: 2020-07-29
    Changes: Database references
  • Version 1.2: 2020-08-26
    Changes: Database references