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Jiang, Yuefeng; Liu, Tingting; Lee, Chia-Hsueh; Chang, Qing; Yang, Jing; Zhang, Zhe
Nature (London), 12/2020, Letnik: 588, Številka: 7839Journal Article
Pathological degeneration of axons disrupts neural circuits and represents one of the hallmarks of neurodegeneration . Sterile alpha and Toll/interleukin-1 receptor motif-containing protein 1 (SARM1) is a central regulator of this neurodegenerative process , and its Toll/interleukin-1 receptor (TIR) domain exerts its pro-neurodegenerative action through NADase activity . However, the mechanisms by which the activation of SARM1 is stringently controlled are unclear. Here we report the cryo-electron microscopy structures of full-length SARM1 proteins. We show that NAD is an unexpected ligand of the armadillo/heat repeat motifs (ARM) domain of SARM1. This binding of NAD to the ARM domain facilitated the inhibition of the TIR-domain NADase through the domain interface. Disruption of the NAD -binding site or the ARM-TIR interaction caused constitutive activation of SARM1 and thereby led to axonal degeneration. These findings suggest that NAD mediates self-inhibition of this central pro-neurodegenerative protein.
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