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7QG0

Inhibitor-induced hSARM1 duplex

Summary for 7QG0
Entry DOI10.2210/pdb7qg0/pdb
EMDB information13951
DescriptorNAD(+) hydrolase SARM1 (1 entity in total)
Functional Keywordssarm1, inhibitor, axon, degeneration, apoptosis
Biological sourceHomo sapiens (Human)
Total number of polymer chains16
Total formula weight1279540.13
Authors
Zalk, R.,Kahzma, T.,Guez-Haddad, J. (deposition date: 2021-12-07, release date: 2022-12-21, Last modification date: 2024-07-17)
Primary citationKhazma, 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
Cited by
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
PDB entries with the same primary citation
Experimental method
ELECTRON MICROSCOPY (4.02 Å)
Structure validation

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