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- PDB-7knq: SARM1 Octamer -

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Basic information

Entry
Database: PDB / ID: 7knq
TitleSARM1 Octamer
ComponentsNAD(+) hydrolase SARM1
KeywordsHYDROLASE / homo-oligomer / Mitochondria localized protein
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 / NADP+ nucleosidase activity / NAD catabolic process / ADP-ribosyl cyclase/cyclic ADP-ribose hydrolase / NAD+ nucleosidase activity / protein localization to mitochondrion / NAD+ nucleotidase, cyclic ADP-ribose generating / nervous system process ...negative regulation of MyD88-independent toll-like receptor signaling pathway / MyD88-independent TLR4 cascade / Toll Like Receptor 3 (TLR3) Cascade / NADP+ nucleosidase activity / NAD catabolic process / ADP-ribosyl cyclase/cyclic ADP-ribose hydrolase / NAD+ nucleosidase activity / protein localization to mitochondrion / NAD+ nucleotidase, cyclic ADP-ribose generating / nervous system process / Hydrolases; Glycosylases; Hydrolysing N-glycosyl compounds / regulation of dendrite morphogenesis / response to axon injury / response to glucose / regulation of neuron apoptotic process / signaling adaptor activity / 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 / mitochondrial outer membrane / microtubule / cell differentiation / axon / innate immune response / dendrite / synapse / cell surface / signal transduction / protein-containing complex / 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: 3.4 Å
AuthorsShen, C. / Wu, H.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)AI050872 United States
CitationJournal: Proc Natl Acad Sci U S A / Year: 2021
Title: Multiple domain interfaces mediate SARM1 autoinhibition.
Authors: Chen Shen / Mihir Vohra / Pengfei Zhang / Xianrong Mao / Matthew D Figley / Jian Zhu / Yo Sasaki / Hao Wu / Aaron DiAntonio / Jeffrey Milbrandt /
Abstract: Axon degeneration is an active program of self-destruction mediated by the protein SARM1. In healthy neurons, SARM1 is autoinhibited and, upon injury autoinhibition is relieved, activating the SARM1 ...Axon degeneration is an active program of self-destruction mediated by the protein SARM1. In healthy neurons, SARM1 is autoinhibited and, upon injury autoinhibition is relieved, activating the SARM1 enzyme to deplete NAD and induce axon degeneration. SARM1 forms a homomultimeric octamer with each monomer composed of an N-terminal autoinhibitory ARM domain, tandem SAM domains that mediate multimerization, and a C-terminal TIR domain encoding the NADase enzyme. Here we discovered multiple intramolecular and intermolecular domain interfaces required for SARM1 autoinhibition using peptide mapping and cryo-electron microscopy (cryo-EM). We identified a candidate autoinhibitory region by screening a panel of peptides derived from the SARM1 ARM domain, identifying a peptide mediating high-affinity inhibition of the SARM1 NADase. Mutation of residues in full-length SARM1 within the region encompassed by the peptide led to loss of autoinhibition, rendering SARM1 constitutively active and inducing spontaneous NAD and axon loss. The cryo-EM structure of SARM1 revealed 1) a compact autoinhibited SARM1 octamer in which the TIR domains are isolated and prevented from oligomerization and enzymatic activation and 2) multiple candidate autoinhibitory interfaces among the domains. Mutational analysis demonstrated that five distinct interfaces are required for autoinhibition, including intramolecular and intermolecular ARM-SAM interfaces, an intermolecular ARM-ARM interface, and two ARM-TIR interfaces formed between a single TIR and two distinct ARM domains. These autoinhibitory regions are not redundant, as point mutants in each led to constitutively active SARM1. These studies define the structural basis for SARM1 autoinhibition and may enable the development of SARM1 inhibitors that stabilize the autoinhibited state.
History
DepositionNov 5, 2020Deposition site: RCSB / Processing site: RCSB
Revision 1.0Nov 17, 2021Provider: repository / Type: Initial release
Revision 1.1Jun 15, 2022Group: Database references / Category: citation / citation_author
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_ASTM / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.journal_volume / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year
Revision 1.2May 29, 2024Group: Data collection / Category: chem_comp_atom / chem_comp_bond

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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


Theoretical massNumber of molelcules
Total (without water)635,8898
Polymers635,8898
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_5551

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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: 79486.164 Da / Num. of mol.: 8
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: SARM1, KIAA0524, SAMD2, SARM / Production host: Spodoptera frugiperda (fall armyworm)
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: Octameric form of SARM1 / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Spodoptera frugiperda (fall armyworm)
Buffer solutionpH: 7.4
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 FIELD
Image recordingElectron dose: 69.2 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.18.2_3874: / Classification: refinement
CTF correctionType: NONE
3D reconstructionResolution: 3.4 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 34643 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00937760
ELECTRON MICROSCOPYf_angle_d0.87851088
ELECTRON MICROSCOPYf_dihedral_angle_d37.8885176
ELECTRON MICROSCOPYf_chiral_restr0.055832
ELECTRON MICROSCOPYf_plane_restr0.0056632

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