SARM1 is a metabolic sensor activated by an increased NMN/NAD+ ratio to trigger axon degeneration
Open accessAbstract
Axon degeneration is a central pathological feature of many neurodegenerative diseases. Sterile alpha and Toll/interleukin-1 receptor motif-containing 1 (SARM1) is a nicotinamide adenine dinucleotide (NAD+)-cleaving enzyme whose activation triggers axon destruction. Loss of the biosynthetic enzyme NMNAT2, which converts nicotinamide mononucleotide (NMN) to NAD+, activates SARM1 via an unknown mechanism. Using structural, biochemical, biophysical, and cellular assays, we demonstrate that SARM1 is activated by an increase in the ratio of NMN to NAD+ and show that both metabolites compete for binding to the auto-inhibitory N-terminal armadillo repeat (ARM) domain of SARM1. We report structures of the SARM1 ARM domain bound to NMN and of the homo-octameric SARM1 complex in the absence of ligands. We show that NMN influences the structure of SARM1 and demonstrate via mutagenesis that NMN binding is required for injury-induced SARM1 activation and axon destruction. Hence, SARM1 is a metabolic sensor responding to an increased NMN/NAD+ ratio by cleaving residual NAD+, thereby inducing feedforward metabolic catastrophe and axonal demise.
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Sarm1 acts as a metabolic sensor to monitor local NAD+ levels.
“Along with NAD + synthase NMNAT2 at the upstream 54 , Sarm1 acts as a metabolic sensor to monitor local NAD + levels 12 .”
From NAD+ hydrolase Sarm1 is a key driver of synapse degeneration and memory loss in Alzheimer’s disease (2025) · cites this paper as [12]
The Discussion identifies SARM1 as a metabolic sensor, but specifies that it responds to the NMN/NAD+ ratio rather than NAD+ levels alone. The Results section on SARM1 activation in neurons likewise says the ratio predicts activation; the claim omits that qualification. (LLM, conf=0.86)
Experimental — accuracy not yet measuredSarm1 remains inactive in physiological conditions but becomes activated in pathological conditions.
“For this reason, Sarm1 remains inactive in physiological conditions but becomes activated in pathological conditions 12,48 .”
From NAD+ hydrolase Sarm1 is a key driver of synapse degeneration and memory loss in Alzheimer’s disease (2025) · cites this paper as [12]
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Towards automated crystallographic structure refinement with <i>phenix.refine</i>
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SARM1 activation triggers axon degeneration locally via NAD <sup>+</sup> destruction
Gerdts, J., Brace, E. J., Sasaki, Y., DiAntonio, A., & Milbrandt, J. (2015) · Science · doi:10.1126/science.1258366 · Cited by 593 · see citing works
Self-citationA rise in NAD precursor nicotinamide mononucleotide (NMN) after injury promotes axon degeneration
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“This was first discovered by understanding the toxic action of the disused rodenticide vacor, which is metabolised by NAMPT to vacor mononucleotide (VMN), an NMN analogue that binds to the same site on the SARM1 inhibitory N-terminal ARM domain as NMN and activates SARM1 NADase activity even more potently [7].”
BackgroundMethodInfluentialNAD+ hydrolase Sarm1 is a key driver of synapse degeneration and memory loss in Alzheimer’s disease
Fan, F., Joshi, P., Liu, X., Kotturu, S. K., Abiola, M., Liu, Q., & Lou, X. (2025) · doi:10.64898/2025.12.21.695860
- Authors
- Figley, M. D., Gu, W., Nanson, J. D., Shi, Y., Sasaki, Y., Cunnea, K., Malde, A. K., Jia, X., Luo, Z., Saikot, F. K., Mosaiab, T., Masic, V., Holt, S., Hartley-Tassell, L., McGuinness, H. Y., Manik, M. K., Bosanac, T., Landsberg, M. J., Kerry, P. S., Mobli, M., Hughes, R. O., Milbrandt, J., Kobe, B., DiAntonio, A., & Ve, T.
- Affiliations
- Washington University in St. Louis (US)
- The University of Queensland (AU)
- Griffith University (AU)
- Evotec (Germany) (DE)
- Disarm Therapeutics (United States) (US)
- Corresponding author
- Milbrandt, Jeffrey
- DiAntonio, Aaron
- Ve, Thomas
- ORCID
- Venue
- Neuron
- Publisher
- Elsevier BV
- Published
- 2021-04
- Volume
- 109
- Issue
- 7
- Pages
- 1118-1136.e11
- ISSN
- 0896-6273 (ISSN-L)
- PMC
- PMC8174188
- OpenAlex
- W3133905451
- Cited by
- 324
- References
- 4
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- 29.91
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- journal article
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- en
- Open access
- bronze
- doi.org
- Licence
- www.elsevier.com/tdm/userlicense/1.0/ (tdm)
- www.elsevier.com/legal/tdmrep-license (tdm)
- www.elsevier.com/open-access/userlicense/1.0/ (vor, 371 d)
- doi.org/10.15223/policy-017 (stm-asf)
- doi.org/10.15223/policy-037 (stm-asf)
- doi.org/10.15223/policy-012 (stm-asf)
- doi.org/10.15223/policy-029 (stm-asf)
- doi.org/10.15223/policy-004 (stm-asf)
- Locations
- Neuron (publishedVersion)
- PubMed (publishedVersion)
- PubMed Central (acceptedVersion)
- Griffith Research Online (submittedVersion, other-oa)
- Funders
- National Computational Infrastructure (cj47)
- National Institutes of Health (R01CA219866, RF1AG013730, RO1NS087632)
- National Health and Medical Research Council (1107804, 1071659, 1160570, 1108859)
- National Institute of Health and Medical Research (RO1NS087632, R01CA219866, RF1AG013730)
- Queensland Cyber Infrastructure Foundation (fi49)
- Australian Research Council (FL180100109)
- University of Queensland
- Topics
- Health Sciences › Medicine › Geriatrics and Gerontology › Sirtuins and Resveratrol in Medicine
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Nerve injury and regeneration
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cell death mechanisms and regulation
- Keywords
- SARM1, axonal degeneration, metabolic sensors, NAD+ metabolism, neurodegeneration
- MeSH terms
- Animals, Axons, Cytoskeletal Proteins, Enzyme Activation, Humans, Models, Molecular, NAD, Nerve Degeneration, Nicotinamide Mononucleotide, Nicotinamide-Nucleotide Adenylyltransferase, Protein Conformation, Mutagenesis, Mice, Knockout, Armadillo Domain Proteins, Mice, Molecular Dynamics Simulation, HEK293 Cells
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
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