7ANW

hSARM1 NAD+ complex


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.68 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history

Re-refinement Note

This entry reflects an alternative modeling of the original data in: 6ZFX


Literature

Structural basis for SARM1 inhibition and activation under energetic stress.

Sporny, M.Guez-Haddad, J.Khazma, T.Yaron, A.Dessau, M.Shkolnisky, Y.Mim, C.Isupov, M.N.Zalk, R.Hons, M.Opatowsky, Y.

(2020) Elife 9

  • DOI: https://doi.org/10.7554/eLife.62021
  • Primary Citation of Related Structures:  
    6ZFX, 6ZG0, 6ZG1, 7ANW

  • PubMed Abstract: 

    SARM1, an executor of axonal degeneration, displays NADase activity that depletes the key cellular metabolite, NAD+, in response to nerve injury. The basis of SARM1 inhibition and its activation under stress conditions are still unknown. Here, we present cryo-EM maps of SARM1 at 2.9 and 2.7 Å resolutions. These indicate that SARM1 homo-octamer avoids premature activation by assuming a packed conformation, with ordered inner and peripheral rings, that prevents dimerization and activation of the catalytic domains. This inactive conformation is stabilized by binding of SARM1's own substrate NAD+ in an allosteric location, away from the catalytic sites. This model was validated by mutagenesis of the allosteric site, which led to constitutively active SARM1. We propose that the reduction of cellular NAD+ concentration contributes to the disassembly of SARM1's peripheral ring, which allows formation of active NADase domain dimers, thereby further depleting NAD+ to cause an energetic catastrophe and cell death.


  • Organizational Affiliation

    The Mina & Everard Goodman Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan, Israel.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
NAD(+) hydrolase SARM1
A, B, C, D, E
A, B, C, D, E, F, G, H
725Homo sapiensMutation(s): 0 
Gene Names: SARM1KIAA0524SAMD2SARM
EC: 3.2.2.6 (PDB Primary Data), 3.2.2 (PDB Primary Data)
UniProt & NIH Common Fund Data Resources
Find proteins for Q6SZW1 (Homo sapiens)
Explore Q6SZW1 
Go to UniProtKB:  Q6SZW1
PHAROS:  Q6SZW1
GTEx:  ENSG00000004139 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ6SZW1
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.68 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Israel Science FoundationIsrael909/19

Revision History  (Full details and data files)

  • Version 1.0: 2020-11-11
    Type: Initial release
  • Version 1.1: 2020-11-25
    Changes: Database references
  • Version 1.2: 2020-12-09
    Changes: Database references
  • Version 1.3: 2024-05-01
    Changes: Data collection, Database references, Refinement description