MST3 in complex with BOSUTINIB

Experimental Data Snapshot

  • Resolution: 2.09 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.176 
  • R-Value Observed: 0.179 

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Ligand Structure Quality Assessment 

This is version 1.4 of the entry. See complete history


Discovery of Diverse Small-Molecule Inhibitors of Mammalian Sterile20-like Kinase 3 (MST3).

Olesen, S.H.Zhu, J.Y.Martin, M.P.Schonbrunn, E.

(2016) ChemMedChem 11: 1137-1144

  • DOI: https://doi.org/10.1002/cmdc.201600115
  • Primary Citation of Related Structures:  
    4QML, 4QMM, 4QMN, 4QMO, 4QMP, 4QMQ, 4QMS, 4QMT, 4QMU, 4QMV, 4QMW, 4QMX, 4QMY, 4QMZ, 4QNA, 4QO9

  • PubMed Abstract: 

    Increasing evidence suggests key roles for members of the mammalian Sterile20-like (MST) family of kinases in many aspects of biology. MST3 is a member of the STRIPAK complex, the deregulation of which has recently been associated with cancer cell migration and metastasis. Targeting MST3 with small-molecule inhibitors may be beneficial for the treatment of certain cancers, but little information exists on the potential of kinase inhibitor scaffolds to engage with MST3. In this study we screened MST3 against a library of 277 kinase inhibitors using differential scanning fluorimetry and confirmed 14 previously unknown MST3 inhibitors by X-ray crystallography. These compounds, of which eight are in clinical trials or FDA approved, comprise nine distinct chemical scaffolds that inhibit MST3 enzymatic activity with IC50 values between 0.003 and 23 μm. The structure-activity relationships explain the differential inhibitory activity of these compounds against MST3 and the structural basis for high binding potential, the information of which may serve as a framework for the rational design of MST3-selective inhibitors as potential therapeutics and to interrogate the function of this enzyme in diseased cells.

  • Organizational Affiliation

    Drug Discovery Department, Moffitt Cancer Center, Tampa, FL, 33612, USA. ernst.schonbrunn@moffitt.org.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Serine/threonine-protein kinase 24310Homo sapiensMutation(s): 0 
Gene Names: MST3STK24STK3
UniProt & NIH Common Fund Data Resources
Find proteins for Q9Y6E0 (Homo sapiens)
Explore Q9Y6E0 
Go to UniProtKB:  Q9Y6E0
GTEx:  ENSG00000102572 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9Y6E0
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on DB8

Download Ideal Coordinates CCD File 
B [auth A]4-[(2,4-dichloro-5-methoxyphenyl)amino]-6-methoxy-7-[3-(4-methylpiperazin-1-yl)propoxy]quinoline-3-carbonitrile
C26 H29 Cl2 N5 O3
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on TPO
Binding Affinity Annotations 
IDSourceBinding Affinity
DB8 BindingDB:  4QMN Kd: min: 37, max: 900 (nM) from 3 assay(s)
IC50: 3.9 (nM) from 1 assay(s)
Binding MOAD:  4QMN IC50: 3 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 2.09 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.176 
  • R-Value Observed: 0.179 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 47.423α = 90
b = 55.357β = 111.32
c = 60.442γ = 90
Software Package:
Software NamePurpose
StructureStudiodata collection
PHENIXmodel building
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report

Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-07-01
    Type: Initial release
  • Version 1.1: 2016-06-15
    Changes: Database references
  • Version 1.2: 2016-07-13
    Changes: Database references
  • Version 1.3: 2018-04-11
    Changes: Data collection
  • Version 1.4: 2023-09-20
    Changes: Data collection, Database references, Derived calculations, Refinement description