4OA7

Crystal structure of Tankyrase1 in complex with IWR1

4OA7 の概要

• エントリーDOI: 10.2210/pdb4oa7/pdb
• 分子名称: Tankyrase-1, ZINC ION, 4-[(3aR,4R,7S,7aS)-1,3-dioxo-1,3,3a,4,7,7a-hexahydro-2H-4,7-methanoisoindol-2-yl]-N-(quinolin-8-yl)benzamide, ... (4 entities in total)
• 機能のキーワード: tankyrase, inhibitor, iwr1, transferase
• 由来する生物種: Homo sapiens (human)
• 細胞内の位置: Cytoplasm: O95271
• タンパク質・核酸の鎖数: 4
• 化学式量合計: 100046.89

構造登録者

Zhang, X.,He, H. (登録日: 2014-01-03, 公開日: 2015-01-07, 最終更新日: 2023-09-20)

主引用文献

Kulak, O.,Chen, H.,Holohan, B.,Wu, X.,He, H.,Borek, D.,Otwinowski, Z.,Yamaguchi, K.,Garofalo, L.A.,Ma, Z.,Wright, W.,Chen, C.,Shay, J.W.,Zhang, X.,Lum, L.
Disruption of Wnt/ beta-Catenin Signaling and Telomeric Shortening Are Inextricable Consequences of Tankyrase Inhibition in Human Cells.
Mol.Cell.Biol., 35:2425-2435, 2015

PubMed Abstract: Maintenance of chromosomal ends (telomeres) directly contributes to cancer cell immortalization. The telomere protection enzymes belonging to the tankyrase (Tnks) subfamily of poly(ADP-ribose) polymerases (PARPs) have recently been shown to also control transcriptional response to secreted Wnt signaling molecules. Whereas Tnks inhibitors are currently being developed as therapeutic agents for targeting Wnt-related cancers and as modulators of Wnt signaling in tissue-engineering agendas, their impact on telomere length maintenance remains unclear. Here, we leveraged a collection of Wnt pathway inhibitors with previously unassigned mechanisms of action to identify novel pharmacophores supporting Tnks inhibition. A multifaceted experimental approach that included structural, biochemical, and cell biological analyses revealed two distinct chemotypes with selectivity for Tnks enzymes. Using these reagents, we revealed that Tnks inhibition rapidly induces DNA damage at telomeres and telomeric shortening upon long-term chemical exposure in cultured cells. On the other hand, inhibitors of the Wnt acyltransferase Porcupine (Porcn) elicited neither effect. Thus, Tnks inhibitors impact telomere length maintenance independently of their affects on Wnt/β-catenin signaling. We discuss the implications of these findings for anticancer and regenerative medicine agendas dependent upon chemical inhibitors of Wnt/β-catenin signaling.

PubMed: 25939383
DOI: 10.1128/MCB.00392-15

実験手法

X-RAY DIFFRACTION (2.301 Å)