6NNG

Tubulin-RB3_SLD-TTL in complex with compound DJ95


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.194 

wwPDB Validation   3D Report Full Report


Ligand Structure Quality Assessment 


This is version 1.1 of the entry. See complete history


Literature

Colchicine Binding Site Agent DJ95 Overcomes Drug Resistance and Exhibits Antitumor Efficacy.

Arnst, K.E.Wang, Y.Lei, Z.N.Hwang, D.J.Kumar, G.Ma, D.Parke, D.N.Chen, Q.Yang, J.White, S.W.Seagroves, T.N.Chen, Z.S.Miller, D.D.Li, W.

(2019) Mol Pharmacol 96: 73-89

  • DOI: https://doi.org/10.1124/mol.118.114801
  • Primary Citation of Related Structures:  
    6NNG

  • PubMed Abstract: 

    Interfering with microtubule dynamics is a well-established strategy in cancer treatment; however, many microtubule-targeting agents are associated with drug resistance and adverse effects. Substantial evidence points to ATP-binding cassette (ABC) transporters as critical players in the development of resistance. Herein, we demonstrate the efficacy of DJ95 (2-(1 H -indol-6-yl)-4-(3,4,5-trimethoxyphenyl)-1 H -imidazo[4,5- c ]pyridine), a novel tubulin inhibitor, in a variety of cancer cell lines, including malignant melanomas, drug-selected resistant cell lines, specific ABC transporter-overexpressing cell lines, and the National Cancer Institute 60 cell line panel. DJ95 treatment inhibited cancer cell migration, caused morphologic changes to the microtubule network foundation, and severely disrupted mitotic spindle formation of mitotic cells. The high-resolution crystal structure of DJ95 in complex with tubulin protein and the detailed molecular interactions confirmed its direct binding to the colchicine site. In vitro pharmacological screening of DJ95 using SafetyScreen44 (Eurofins Cerep-Panlabs) revealed no significant off-target interactions, and pharmacokinetic analysis showed that DJ95 was maintained at therapeutically relevant plasma concentrations for up to 24 hours in mice. In an A375 xenograft model in nude mice, DJ95 inhibited tumor growth and disrupted tumor vasculature in xenograft tumors. These results demonstrate that DJ95 is potent against a variety of cell lines, demonstrated greater potency to ABC transporter-overexpressing cell lines than existing tubulin inhibitors, directly targets the colchicine binding domain, exhibits significant antitumor efficacy, and demonstrates vascular-disrupting properties. Collectively, these data suggest that DJ95 has great potential as a cancer therapeutic, particularly for multidrug resistance phenotypes, and warrants further development. SIGNIFICANCE STATEMENT: Paclitaxel is a widely used tubulin inhibitor for cancer therapy, but its clinical efficacy is often limited by the development of multidrug resistance. In this study, we reported the preclinical characterization of a new tubulin inhibitor DJ95, and demonstrated its abilities to overcome paclitaxel resistance, disrupt tumor vasculature, and exhibit significant antitumor efficacy.


  • Organizational Affiliation

    Department of Pharmaceutical Sciences, College of Pharmacy (K.E.A., D.-J.H., D.M., D.D.M., W.L.), and Department of Pathology (D.N.P., T.N.S.), the University of Tennessee Health Science Center, Memphis, Tennessee; State Key Laboratory of Biotherapy and Cancer Center, Collaborative Innovation Center of Biotherapy (Y.W., Q.C., J.Y.), and Department of Respiratory Medicine (Y.W.), West China Hospital, Sichuan University, Chengdu, China; Department of Pharmaceutical Sciences, College of Pharmacy and Health Sciences, St. John's University, Queens, New York (Z.-N.L., Z.-S.C.); and Department of Structural Biology, St. Jude Children's Research Hospital, Memphis, Tennessee (G.K., S.W.W.).


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Tubulin alpha-1B chain
A, C
450Sus scrofaMutation(s): 0 
EC: 3.6.5
UniProt
Find proteins for Q2XVP4 (Sus scrofa)
Explore Q2XVP4 
Go to UniProtKB:  Q2XVP4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ2XVP4
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Tubulin beta-2B chain
B, D
445Sus scrofaMutation(s): 0 
UniProt
Find proteins for P02554 (Sus scrofa)
Explore P02554 
Go to UniProtKB:  P02554
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UniProt GroupP02554
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Stathmin-4143Homo sapiensMutation(s): 0 
Gene Names: STMN4
UniProt & NIH Common Fund Data Resources
Find proteins for Q9H169 (Homo sapiens)
Explore Q9H169 
Go to UniProtKB:  Q9H169
PHAROS:  Q9H169
GTEx:  ENSG00000015592 
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UniProt GroupQ9H169
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  • Reference Sequence
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
Tubulin Tyrosine Ligase384Gallus gallusMutation(s): 0 
Gene Names: TTL
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  • Reference Sequence
Small Molecules
Ligands 7 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
GTP
Query on GTP

Download Ideal Coordinates CCD File 
G [auth A],
O [auth C],
R [auth D]
GUANOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O14 P3
XKMLYUALXHKNFT-UUOKFMHZSA-N
ACP
Query on ACP

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T [auth F]PHOSPHOMETHYLPHOSPHONIC ACID ADENYLATE ESTER
C11 H18 N5 O12 P3
UFZTZBNSLXELAL-IOSLPCCCSA-N
GDP
Query on GDP

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J [auth B]GUANOSINE-5'-DIPHOSPHATE
C10 H15 N5 O11 P2
QGWNDRXFNXRZMB-UUOKFMHZSA-N
DJ9 (Subject of Investigation/LOI)
Query on DJ9

Download Ideal Coordinates CCD File 
N [auth B]2-(1H-indol-6-yl)-4-(3,4,5-trimethoxyphenyl)-1H-imidazo[4,5-c]pyridine
C23 H20 N4 O3
SQSZRGOISCZCTQ-UHFFFAOYSA-N
MES
Query on MES

Download Ideal Coordinates CCD File 
L [auth B],
M [auth B]
2-(N-MORPHOLINO)-ETHANESULFONIC ACID
C6 H13 N O4 S
SXGZJKUKBWWHRA-UHFFFAOYSA-N
CA
Query on CA

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I [auth A],
Q [auth C]
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
MG
Query on MG

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H [auth A],
K [auth B],
P [auth C],
S [auth F]
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.194 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 105.418α = 90
b = 157.979β = 90
c = 182.84γ = 90
Software Package:
Software NamePurpose
HKL-2000data scaling
PHENIXrefinement
PDB_EXTRACTdata extraction

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


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

Revision History  (Full details and data files)

  • Version 1.0: 2019-07-10
    Type: Initial release
  • Version 1.1: 2019-12-04
    Changes: Author supporting evidence