6BRY

Tubulin-RB3_SLD-TTL in complex with heterocyclic pyrimidine compound 6a


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.194 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Heterocyclic-Fused Pyrimidines as Novel Tubulin Polymerization Inhibitors Targeting the Colchicine Binding Site: Structural Basis and Antitumor Efficacy.

Banerjee, S.Arnst, K.E.Wang, Y.Kumar, G.Deng, S.Yang, L.Li, G.B.Yang, J.White, S.W.Li, W.Miller, D.D.

(2018) J Med Chem 61: 1704-1718

  • DOI: 10.1021/acs.jmedchem.7b01858
  • Primary Citation of Related Structures:  
    6BR1, 6BRY, 6BS2, 6BRF

  • PubMed Abstract: 
  • We report the design, synthesis, and biological evaluation of heterocyclic-fused pyrimidines as tubulin polymerization inhibitors targeting the colchicine binding site with significantly improved therapeutic index. Additionally, for the first time, w ...

    We report the design, synthesis, and biological evaluation of heterocyclic-fused pyrimidines as tubulin polymerization inhibitors targeting the colchicine binding site with significantly improved therapeutic index. Additionally, for the first time, we report high-resolution X-ray crystal structures for the best compounds in this scaffold, 4a, 4b, 6a, and 8b. These structures not only confirm their direct binding to the colchicine site in tubulin and reveal their detailed molecular interactions but also contrast the previously published proposed binding mode. Compounds 4a and 6a significantly inhibited tumor growth in an A375 melanoma xenograft model and were accompanied by elevated levels of apoptosis and disruption of tumor vasculature. Finally, we demonstrated that compound 4a significantly overcame clinically relevant multidrug resistance in a paclitaxel resistant PC-3/TxR prostate cancer xenograft model. Collectively, these studies provide preclinical and structural proof of concept to support the continued development of this scaffold as a new generation of tubulin inhibitors.


    Organizational Affiliation

    Department of Pharmaceutical Sciences, College of Pharmacy, University of Tennessee Health Science Center , Memphis, Tennessee 38163, United States.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Tubulin beta-2B chainBD445Sus scrofaMutation(s): 0 
Find proteins for P02554 (Sus scrofa)
Explore P02554 
Go to UniProtKB:  P02554
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Stathmin-4E143Homo sapiensMutation(s): 0 
Gene Names: STMN4
Find proteins for Q9H169 (Homo sapiens)
Explore Q9H169 
Go to UniProtKB:  Q9H169
NIH Common Fund Data Resources
PHAROS  Q9H169
Protein Feature View
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  • Reference Sequence
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Tubulin tyrosine ligaseF384Gallus gallusMutation(s): 0 
Gene Names: TTL
Find proteins for E1BQ43 (Gallus gallus)
Explore E1BQ43 
Go to UniProtKB:  E1BQ43
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  • Reference Sequence
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Tubulin alpha-1B chainAC450Sus scrofaMutation(s): 0 
Gene Names: TUBA1B
Find proteins for Q2XVP4 (Sus scrofa)
Explore Q2XVP4 
Go to UniProtKB:  Q2XVP4
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 7 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
GK9
Query on GK9

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B, D
1-(2-chlorofuro[3,2-d]pyrimidin-4-yl)-6-methoxy-1,2,3,4-tetrahydroquinoline
C16 H14 Cl N3 O2
OHDPJCAMZXLYKM-UHFFFAOYSA-N
 Ligand Interaction
MES
Query on MES

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

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

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A, B, C, F
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.194 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 105.089α = 90
b = 157.766β = 90
c = 181.456γ = 90
Software Package:
Software NamePurpose
HKL-2000data scaling
PHENIXrefinement
PDB_EXTRACTdata extraction
HKL-2000data reduction
PHASERphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Cancer Institute (NIH/NCI)United StatesR01CA148706

Revision History 

  • Version 1.0: 2018-06-27
    Type: Initial release
  • Version 1.1: 2019-02-20
    Changes: Author supporting evidence, Data collection
  • Version 1.2: 2019-12-04
    Changes: Author supporting evidence