PARP15 catalytic domain in complex with OUL188

Experimental Data Snapshot

  • Resolution: 1.90 Å
  • R-Value Free: 0.272 
  • R-Value Work: 0.233 
  • R-Value Observed: 0.235 

wwPDB Validation   3D Report Full Report

This is version 1.1 of the entry. See complete history


[1,2,4]Triazolo[3,4- b ]benzothiazole Scaffold as Versatile Nicotinamide Mimic Allowing Nanomolar Inhibition of Different PARP Enzymes.

Murthy, S.Nizi, M.G.Maksimainen, M.M.Massari, S.Alaviuhkola, J.Lippok, B.E.Vagaggini, C.Sowa, S.T.Galera-Prat, A.Ashok, Y.Venkannagari, H.Prunskaite-Hyyrylainen, R.Dreassi, E.Luscher, B.Korn, P.Tabarrini, O.Lehtio, L.

(2023) J Med Chem 66: 1301-1320

  • DOI: https://doi.org/10.1021/acs.jmedchem.2c01460
  • Primary Citation of Related Structures:  
    7R3L, 7R3O, 7R3Z, 7R4A, 7R59, 7R5D, 7R5X, 7Z1V, 7Z1W, 7Z1Y, 7Z2O, 7Z2Q, 7Z41

  • PubMed Abstract: 

    We report [1,2,4]triazolo[3,4- b ]benzothiazole (TBT) as a new inhibitor scaffold, which competes with nicotinamide in the binding pocket of human poly- and mono-ADP-ribosylating enzymes. The binding mode was studied through analogues and cocrystal structures with TNKS2, PARP2, PARP14, and PARP15. Based on the substitution pattern, we were able to identify 3-amino derivatives 21 (OUL243) and 27 (OUL232) as inhibitors of mono-ARTs PARP7, PARP10, PARP11, PARP12, PARP14, and PARP15 at nM potencies, with 27 being the most potent PARP10 inhibitor described to date (IC 50 of 7.8 nM) and the first PARP12 inhibitor ever reported. On the contrary, hydroxy derivative 16 (OUL245) inhibits poly-ARTs with a selectivity toward PARP2. The scaffold does not possess inherent cell toxicity, and the inhibitors can enter cells and engage with the target protein. This, together with favorable ADME properties, demonstrates the potential of TBT scaffold for future drug development efforts toward selective inhibitors against specific enzymes.

  • Organizational Affiliation

    Faculty of Biochemistry and Molecular Medicine and Biocenter Oulu, University of Oulu, Oulu90220, Finland.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Protein mono-ADP-ribosyltransferase PARP15
A, B
221Homo sapiensMutation(s): 0 
Gene Names: PARP15BAL3
EC: 2.4.2
UniProt & NIH Common Fund Data Resources
Find proteins for Q460N3 (Homo sapiens)
Explore Q460N3 
Go to UniProtKB:  Q460N3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ460N3
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
I1B (Subject of Investigation/LOI)
Query on I1B

Download Ideal Coordinates CCD File 
C [auth A]6,8-dimethyl-[1,2,4]triazolo[3,4-b][1,3]benzothiazole
C10 H9 N3 S
Query on DMS

Download Ideal Coordinates CCD File 
C2 H6 O S
Experimental Data & Validation

Experimental Data

Unit Cell:
Length ( Å )Angle ( ˚ )
a = 45.46α = 90
b = 68.74β = 90
c = 159.23γ = 90
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
XDSdata reduction
XSCALEdata scaling

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Jane and Aatos Erkko FoundationFinland--
Academy of FinlandFinland287063
Academy of FinlandFinland294085

Revision History  (Full details and data files)

  • Version 1.0: 2023-01-25
    Type: Initial release
  • Version 1.1: 2023-02-08
    Changes: Database references