5O7A

Quinolin-6-yloxyacetamides are microtubule destabilizing agents that bind to the colchicine site of tubulin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.205 

wwPDB Validation 3D Report Full Report



Literature

Quinolin-6-Yloxyacetamides Are Microtubule Destabilizing Agents That Bind to the Colchicine Site of Tubulin.

Sharma, A.Saez-Calvo, G.Olieric, N.de Asis Balaguer, F.Barasoain, I.Lamberth, C.Diaz, J.F.Steinmetz, M.O.

(2017) Int J Mol Sci 18

  • DOI: 10.3390/ijms18071336
  • Primary Citation of Related Structures:  
    5O7A

  • PubMed Abstract: 
  • Quinolin-6-yloxyacetamides (QAs) are a chemical class of tubulin polymerization inhibitors that were initially identified as fungicides. Here, we report that QAs are potent anti-proliferative agents against human cancer cells including ones that are ...

    Quinolin-6-yloxyacetamides (QAs) are a chemical class of tubulin polymerization inhibitors that were initially identified as fungicides. Here, we report that QAs are potent anti-proliferative agents against human cancer cells including ones that are drug-resistant. QAs act by disrupting the microtubule cytoskeleton and by causing severe mitotic defects. We further demonstrate that QAs inhibit tubulin polymerization in vitro. The high resolution crystal structure of the tubulin-QA complex revealed that QAs bind to the colchicine site on tubulin, which is targeted by microtubule-destabilizing agents such as colchicine and nocodazole. Together, our data establish QAs as colchicine-site ligands and explain the molecular mechanism of microtubule destabilization by this class of compounds. They further extend our structural knowledge on antitubulin agents and thus should aid in the development of new strategies for the rational design of ligands against multidrug-resistant cancer cells.


    Organizational Affiliation

    Laboratory of Biomolecular Research, Division of Biology and Chemistry, Paul Scherrer Institut, CH-5232 Villigen, Switzerland. michel.steinmetz@psi.ch.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Tubulin alpha-1B chainAC451Bos taurusMutation(s): 0 
Find proteins for P81947 (Bos taurus)
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Go to UniProtKB:  P81947
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Tubulin beta-2B chainBD445Bos taurusMutation(s): 0 
Gene Names: TUBB2B
Find proteins for Q6B856 (Bos taurus)
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Go to UniProtKB:  Q6B856
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Stathmin-4E143Rattus norvegicusMutation(s): 0 
Gene Names: Stmn4
Find proteins for P63043 (Rattus norvegicus)
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Go to UniProtKB:  P63043
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  • Reference Sequence
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Uncharacterized proteinF384Gallus gallusMutation(s): 0 
Gene Names: TTL
Find proteins for E1BQ43 (Gallus gallus)
Explore E1BQ43 
Go to UniProtKB:  E1BQ43
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  • Reference Sequence
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GTP
Query on GTP

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A, C
GUANOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O14 P3
XKMLYUALXHKNFT-UUOKFMHZSA-N
 Ligand Interaction
ACP
Query on ACP

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F
PHOSPHOMETHYLPHOSPHONIC ACID ADENYLATE ESTER
C11 H18 N5 O12 P3
UFZTZBNSLXELAL-IOSLPCCCSA-N
 Ligand Interaction
GDP
Query on GDP

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B, D
GUANOSINE-5'-DIPHOSPHATE
C10 H15 N5 O11 P2
QGWNDRXFNXRZMB-UUOKFMHZSA-N
 Ligand Interaction
9N5
Query on 9N5

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B, D
(2~{R})-2-(3-ethynylquinolin-6-yl)oxy-2-methoxy-~{N}-[(1~{E})-1-methoxyimino-2-methyl-propan-2-yl]ethanamide
C19 H21 N3 O4
PCSOIAVOYXKQKF-AGKWGAAGSA-N
 Ligand Interaction
MG
Query on MG

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B, D
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.205 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 104.907α = 90
b = 157.474β = 90
c = 180.678γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XSCALEdata scaling
PHENIXphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2017-07-05
    Type: Initial release