3U9H

Complex structure of human tankyrase 2 with nicotinamide

Summary for 3U9H

• Entry DOI: 10.2210/pdb3u9h/pdb
• Descriptor: Tankyrase-2, ZINC ION, SULFATE ION, ... (7 entities in total)
• Functional Keywords: protein-ligand complex, diphtheria toxin like fold, transferase, adp-ribosylation
• Biological source: Homo sapiens (human)
• Cellular location: Cytoplasm: Q9H2K2
• Total number of polymer chains: 2
• Total formula weight: 55663.18

Authors

Narwal, M.,Lehtio, L. (deposition date: 2011-10-19, release date: 2011-11-02, Last modification date: 2023-09-13)

Primary citation

Narwal, M.,Venkannagari, H.,Lehtio, L.
Structural basis of selective inhibition of human tankyrases.
J.Med.Chem., 55:1360-1367, 2012

PubMed Abstract: Tankyrases are poly(ADP-ribose) polymerases that have many cellular functions. They play pharmaceutically important roles, at least in telomere homeostasis and Wnt signaling, by covalently ADP-ribosylating target proteins and consequently regulating their functions. These features make tankyrases potential targets for treatment of cancer. We report here crystal structures of human tankyrase 2 catalytic fragment in complex with a byproduct, nicotinamide, and with selective inhibitors of tankyrases (IWR-1) and PARPs 1 and 2 (olaparib). Binding of these inhibitors to tankyrase 2 induces specific conformational changes. The crystal structures explain the selectivity of the inhibitors, reveal the flexibility of a substrate binding loop, and explain existing structure-activity relationship data. The first crystal structure of a PARP enzyme in complex with a potent inhibitor, IWR-1, that does not bind to the widely utilized nicotinamide-binding site makes the structure valuable for development of PARP inhibitors in general.

PubMed: 22233320
DOI: 10.1021/jm201510p

Experimental method

X-RAY DIFFRACTION (1.75 Å)