7QG0

Inhibitor-induced hSARM1 duplex

7QG0 の概要

• エントリーDOI: 10.2210/pdb7qg0/pdb
• EMDBエントリー: 13951
• 分子名称: NAD(+) hydrolase SARM1 (1 entity in total)
• 機能のキーワード: sarm1, inhibitor, axon, degeneration, apoptosis
• 由来する生物種: Homo sapiens (Human)
• タンパク質・核酸の鎖数: 16
• 化学式量合計: 1279540.13

構造登録者

Zalk, R.,Kahzma, T.,Guez-Haddad, J. (登録日: 2021-12-07, 公開日: 2022-12-21, 最終更新日: 2025-07-09)

主引用文献

Khazma, T.,Golan-Vaishenker, Y.,Guez-Haddad, J.,Grossman, A.,Sain, R.,Weitman, M.,Plotnikov, A.,Zalk, R.,Hons, M.,Opatowsky, Y.
A duplex structure of SARM1 octamers stabilized by a new inhibitor.
Cell.Mol.Life Sci., 80:16-16, 2022

PubMed Abstract: In recent years, there has been growing interest in SARM1 as a potential breakthrough drug target for treating various pathologies of axon degeneration. SARM1-mediated axon degeneration relies on its TIR domain NADase activity, but recent structural data suggest that the non-catalytic ARM domain could also serve as a pharmacological site as it has an allosteric inhibitory function. Here, we screened for synthetic small molecules that inhibit SARM1, and tested a selected set of these compounds in a DRG axon degeneration assay. Using cryo-EM, we found that one of the newly discovered inhibitors, a calmidazolium designated TK106, not only stabilizes the previously reported inhibited conformation of the octamer, but also a meta-stable structure: a duplex of octamers (16 protomers), which we have now determined to 4.0 Å resolution. In the duplex, each ARM domain protomer is engaged in lateral interactions with neighboring protomers, and is further stabilized by contralateral contacts with the opposing octamer ring. Mutagenesis of the duplex contact sites leads to a moderate increase in SARM1 activation in cultured cells. Based on our data we propose that the duplex assembly constitutes an additional auto-inhibition mechanism that tightly prevents pre-mature activation and axon degeneration.

PubMed: 36564647
DOI: 10.1007/s00018-022-04641-3

実験手法

ELECTRON MICROSCOPY (4.02 Å)