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- PDB-7qg0: Inhibitor-induced hSARM1 duplex -

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Basic information

Entry
Database: PDB / ID: 7qg0
TitleInhibitor-induced hSARM1 duplex
ComponentsNAD(+) hydrolase SARM1
KeywordsAPOPTOSIS / SARM1 / inhibitor / axon / degeneration
Function / homology
Function and homology information


negative regulation of MyD88-independent toll-like receptor signaling pathway / MyD88-independent TLR4 cascade / Toll Like Receptor 3 (TLR3) Cascade / NAD catabolic process / NAD+ nucleosidase activity / ADP-ribosyl cyclase/cyclic ADP-ribose hydrolase / protein localization to mitochondrion / NAD+ nucleotidase, cyclic ADP-ribose generating / NADP+ nucleosidase activity / nervous system process ...negative regulation of MyD88-independent toll-like receptor signaling pathway / MyD88-independent TLR4 cascade / Toll Like Receptor 3 (TLR3) Cascade / NAD catabolic process / NAD+ nucleosidase activity / ADP-ribosyl cyclase/cyclic ADP-ribose hydrolase / protein localization to mitochondrion / NAD+ nucleotidase, cyclic ADP-ribose generating / NADP+ nucleosidase activity / nervous system process / Hydrolases; Glycosylases; Hydrolysing N-glycosyl compounds / regulation of dendrite morphogenesis / response to axon injury / response to glucose / signaling adaptor activity / regulation of neuron apoptotic process / TRAF6-mediated induction of TAK1 complex within TLR4 complex / Activation of IRF3, IRF7 mediated by TBK1, IKKε (IKBKE) / IKK complex recruitment mediated by RIP1 / nervous system development / microtubule / mitochondrial outer membrane / cell differentiation / axon / innate immune response / dendrite / synapse / signal transduction / mitochondrion / identical protein binding / cytosol / cytoplasm
Similarity search - Function
Sterile alpha and TIR motif-containing protein 1 / TIR domain / Toll - interleukin 1 - resistance / TIR domain profile. / Toll/interleukin-1 receptor homology (TIR) domain / Toll/interleukin-1 receptor homology (TIR) domain superfamily / SAM domain (Sterile alpha motif) / SAM domain profile. / Sterile alpha motif. / Sterile alpha motif domain ...Sterile alpha and TIR motif-containing protein 1 / TIR domain / Toll - interleukin 1 - resistance / TIR domain profile. / Toll/interleukin-1 receptor homology (TIR) domain / Toll/interleukin-1 receptor homology (TIR) domain superfamily / SAM domain (Sterile alpha motif) / SAM domain profile. / Sterile alpha motif. / Sterile alpha motif domain / Sterile alpha motif/pointed domain superfamily / Armadillo-like helical / Armadillo-type fold
Similarity search - Domain/homology
NAD(+) hydrolase SARM1
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 4.02 Å
AuthorsZalk, R. / Kahzma, T. / Guez-Haddad, J.
Funding support United States, 2items
OrganizationGrant numberCountry
Israel Science Foundation909/19 United States
United States - Israel Binational Science Foundation (BSF)2019150 United States
CitationJournal: Cell Mol Life Sci / Year: 2022
Title: A duplex structure of SARM1 octamers stabilized by a new inhibitor.
Authors: Tami Khazma / Yarden Golan-Vaishenker / Julia Guez-Haddad / Atira Grossman / Radhika Sain / Michal Weitman / Alexander Plotnikov / Ran Zalk / Avraham Yaron / Michael Hons / Yarden Opatowsky /
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 ...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.
History
DepositionDec 7, 2021Deposition site: PDBE / Processing site: PDBE
Revision 1.0Dec 21, 2022Provider: repository / Type: Initial release
Revision 1.1Jan 11, 2023Group: Database references / Category: citation / citation_author
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.journal_volume / _citation.page_first / _citation.page_last / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: NAD(+) hydrolase SARM1
B: NAD(+) hydrolase SARM1
C: NAD(+) hydrolase SARM1
D: NAD(+) hydrolase SARM1
E: NAD(+) hydrolase SARM1
F: NAD(+) hydrolase SARM1
G: NAD(+) hydrolase SARM1
H: NAD(+) hydrolase SARM1
I: NAD(+) hydrolase SARM1
J: NAD(+) hydrolase SARM1
K: NAD(+) hydrolase SARM1
L: NAD(+) hydrolase SARM1
M: NAD(+) hydrolase SARM1
N: NAD(+) hydrolase SARM1
O: NAD(+) hydrolase SARM1
P: NAD(+) hydrolase SARM1


Theoretical massNumber of molelcules
Total (without water)1,279,54016
Polymers1,279,54016
Non-polymers00
Water0
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area83550 Å2
ΔGint-79 kcal/mol
Surface area408740 Å2

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Components

#1: Protein
NAD(+) hydrolase SARM1 / hSARM1 / NADP(+) hydrolase SARM1 / Sterile alpha and Armadillo repeat protein / Sterile alpha and ...hSARM1 / NADP(+) hydrolase SARM1 / Sterile alpha and Armadillo repeat protein / Sterile alpha and TIR motif-containing protein 1 / Sterile alpha motif domain-containing protein 2 / SAM domain-containing protein 2 / Tir-1 homolog / HsTIR


Mass: 79971.258 Da / Num. of mol.: 16 / Mutation: E642Q
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: SARM1, KIAA0524, SAMD2, SARM / Cell line (production host): HEK293F / Production host: Homo sapiens (human)
References: UniProt: Q6SZW1, ADP-ribosyl cyclase/cyclic ADP-ribose hydrolase, Hydrolases; Glycosylases; Hydrolysing N-glycosyl compounds

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: SARM1 / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 8.5
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELDBright-field microscopy
Image recordingElectron dose: 40 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.17.1_3660: / Classification: refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 4.02 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 28303 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00680192
ELECTRON MICROSCOPYf_angle_d0.734108416
ELECTRON MICROSCOPYf_dihedral_angle_d18.97910960
ELECTRON MICROSCOPYf_chiral_restr0.04212416
ELECTRON MICROSCOPYf_plane_restr0.00414064

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