4O2B

Tubulin-Colchicine complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.182 
  • R-Value Observed: 0.183 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

The Novel Microtubule-Destabilizing Drug BAL27862 Binds to the Colchicine Site of Tubulin with Distinct Effects on Microtubule Organization.

Prota, A.E.Danel, F.Bachmann, F.Bargsten, K.Buey, R.M.Pohlmann, J.Reinelt, S.Lane, H.Steinmetz, M.O.

(2014) J Mol Biol 426: 1848-1860

  • DOI: 10.1016/j.jmb.2014.02.005
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Microtubule-targeting agents are widely used for the treatment of cancer and as tool compounds to study the microtubule cytoskeleton. BAL27862 is a novel microtubule-destabilizing drug that is currently undergoing phase I clinical evaluation as the p ...

    Microtubule-targeting agents are widely used for the treatment of cancer and as tool compounds to study the microtubule cytoskeleton. BAL27862 is a novel microtubule-destabilizing drug that is currently undergoing phase I clinical evaluation as the prodrug BAL101553. The drug is a potent inhibitor of tumor cell growth and shows a promising activity profile in a panel of human cancer models resistant to clinically relevant microtubule-targeting agents. Here, we evaluated the molecular mechanism of the tubulin-BAL27862 interaction using a combination of cell biology, biochemistry and structural biology methods. Tubulin-binding assays revealed that BAL27862 potently inhibited tubulin assembly at 37 °C with an IC50 of 1.4 μM and bound to unassembled tubulin with a stoichiometry of 1 mol/mol tubulin and a dissociation constant of 244±30 nM. BAL27862 bound to tubulin independently of vinblastine, without the formation of tubulin oligomers. The kinetics of BAL27862 binding to tubulin were distinct from those of colchicine, with evidence of competition between BAL27862 and colchicine for binding. Determination of the tubulin-BAL27862 structure by X-ray crystallography demonstrated that BAL27862 binds to the same site as colchicine at the intradimer interface. Comparison of crystal structures of tubulin-BAL27862 and tubulin-colchicine complexes shows that the binding mode of BAL27862 to tubulin is similar to that of colchicine. However, comparative analyses of the effects of BAL27862 and colchicine on the microtubule mitotic spindle and in tubulin protease-protection experiments suggest different outcomes of tubulin binding. Taken together, our data define BAL27862 as a potent, colchicine site-binding, microtubule-destabilizing agent with distinct effects on microtubule organization.


    Organizational Affiliation

    Laboratory of Biomolecular Research, Department of Biology and Chemistry Paul Scherrer Institut, 5232 Villigen, Switzerland. Electronic address: michel.steinmetz@psi.ch.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Tubulin alpha-1B chainA, C451Bos taurusMutation(s): 0 
Find proteins for P81947 (Bos taurus)
Explore P81947 
Go to UniProtKB:  P81947
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Tubulin beta-2B chainB, D445Bos taurusMutation(s): 0 
Gene Names: TUBB2B
Find proteins for Q6B856 (Bos taurus)
Explore Q6B856 
Go to UniProtKB:  Q6B856
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  • Reference Sequence

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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Stathmin-4E143Rattus norvegicusMutation(s): 0 
Gene Names: Stmn4
Find proteins for P63043 (Rattus norvegicus)
Explore P63043 
Go to UniProtKB:  P63043
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  • Reference Sequence

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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
Tubulin-tyrosine ligaseF384Gallus gallusMutation(s): 0 
Gene Names: TTL
Find proteins for E1BQ43 (Gallus gallus)
Explore E1BQ43 
Go to UniProtKB:  E1BQ43
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 10 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
LOC
Query on LOC

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B, D
N-[(7S)-1,2,3,10-tetramethoxy-9-oxo-6,7-dihydro-5H-benzo[d]heptalen-7-yl]ethanamide
C22 H25 N O6
IAKHMKGGTNLKSZ-INIZCTEOSA-N
 Ligand Interaction
MES
Query on MES

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B
2-(N-MORPHOLINO)-ETHANESULFONIC ACID
C6 H13 N O4 S
SXGZJKUKBWWHRA-UHFFFAOYSA-N
 Ligand Interaction
PEG
Query on PEG

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C
DI(HYDROXYETHYL)ETHER
C4 H10 O3
MTHSVFCYNBDYFN-UHFFFAOYSA-N
 Ligand Interaction
GOL
Query on GOL

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A, B, C, D, E
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
IMD
Query on IMD

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C
IMIDAZOLE
C3 H5 N2
RAXXELZNTBOGNW-UHFFFAOYSA-O
 Ligand Interaction
CA
Query on CA

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A, B, C
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
MG
Query on MG

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A, B, C, D, F
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
LOCIC50:  3500   nM  BindingDB
LOCIC50:  10000   nM  BindingDB
LOCIC50:  4168.68994140625   nM  BindingDB
LOCKi:  5750   nM  BindingDB
LOCIC50:  2620   nM  BindingDB
LOCIC50:  1900   nM  BindingDB
LOCIC50:  29300   nM  BindingDB
LOCIC50:  800   nM  BindingDB
LOCIC50:  1500   nM  BindingDB
LOCIC50:  1900   nM  BindingDB
LOCKi:  780   nM  BindingDB
LOCKi:  2500   nM  BindingDB
LOCIC50:  2400   nM  BindingDB
LOCIC50:  3790   nM  BindingDB
LOCIC50:  1400   nM  Binding MOAD
LOCIC50:  800   nM  BindingDB
LOCIC50:  1700   nM  BindingDB
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.182 
  • R-Value Observed: 0.183 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 104.31α = 90
b = 157.01β = 90
c = 180.22γ = 90
Software Package:
Software NamePurpose
DA+data collection
PHENIXmodel building
PHENIXrefinement
XDSdata reduction
XDSdata scaling
PHENIXphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-03-05
    Type: Initial release
  • Version 1.1: 2014-04-16
    Changes: Database references