NAD+ cleavage activity by animal and plant TIR domains in cell death pathways
NAD depletion as pathogen response
One way that plants respond to pathogen infection is by sacrificing the infected cells. The nucleotide-binding leucine-rich repeat immune receptors responsible for this hypersensitive response carry Toll/interleukin-1 receptor (TIR) domains. In two papers, Horsefield et al. and Wan et al. report that these TIR domains cleave the metabolic cofactor nicotinamide adenine dinucleotide (NAD+) as part of their cell-death signaling in response to pathogens. Similar signaling links mammalian TIR-containing proteins to NAD+ depletion during Wallerian degeneration of neurons.
Abstract
SARM1 (sterile alpha and TIR motif containing 1) is responsible for depletion of nicotinamide adenine dinucleotide in its oxidized form (NAD+) during Wallerian degeneration associated with neuropathies. Plant nucleotide-binding leucine-rich repeat (NLR) immune receptors recognize pathogen effector proteins and trigger localized cell death to restrict pathogen infection. Both processes depend on closely related Toll/interleukin-1 receptor (TIR) domains in these proteins, which, as we show, feature self-association–dependent NAD+ cleavage activity associated with cell death signaling. We further show that SARM1 SAM (sterile alpha motif) domains form an octamer essential for axon degeneration that contributes to TIR domain enzymatic activity. The crystal structures of ribose and NADP+ (the oxidized form of nicotinamide adenine dinucleotide phosphate) complexes of SARM1 and plant NLR RUN1 TIR domains, respectively, reveal a conserved substrate binding site. NAD+ cleavage by TIR domains is therefore a conserved feature of animal and plant cell death signaling pathways.
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Supplementary Material
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Materials and Methods
Figs. S1 to S28
Table S1 to S8
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References and Notes
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Volume 365 | Issue 6455
23 August 2019
23 August 2019
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Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works.
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Received: 28 February 2019
Accepted: 23 July 2019
Published in print: 23 August 2019
Acknowledgments
We acknowledge the use of the University of Queensland Remote Operation Crystallization and X-Ray Diffraction (UQ-ROCX) Facility and the macromolecular crystallography (MX) and small/wide-angle X-ray scattering (SAXS/WAXS) beamlines at the Australian Synchrotron, Victoria, Australia. MD simulations were performed on the High Performance Computing cluster “Gowonda” at Griffith University. We thank V. Masic and N. Deerain for technical contributions. Funding: The work was supported by the National Health and Medical Research Council (NHMRC grants 1107804 and 1160570 to B.K. and T.V.. 1071659 to B.K., and 1108859 to T.V.), and the Australian Research Council (ARC grants DP160102244 and DP190102526 to B.K. and P.N.D.). B.K. was an NHMRC Principal Research Fellow (1110971) and ARC Laureate Fellow (FL180100109). T.V. received ARC DECRA (DE170100783) funding and S.J.W. received ARC DECRA DE160100893 funding. J.C. received a Chinese Scholarship Council (CSC) postgraduate scholarship. Y.S. was a Griffith University postdoctoral fellow. J.G. was supported by the UK Medical Research Council and M.P.C. was supported by the John and Lucille van Geest Foundation. M.K.M. was supported by the Australian Government Research Training Program (RTP). Author contributions: S.H., H.B., X.Z., M.K.M., Y.S., J.G., R.O.H., T.B., S.J.W., T.V., P.D., and B.K. designed the research; S.H., H.B., X.Z., M.K.M., Y.S., J.G., J.C., L.W.C., T.Q., J.S.L., W.G., M.X.R., D.J.E., G.F., R.O.H., T.B., and T.V. performed the research; S.H., H.B., X.Z., M.K.M., Y.S., J.G., L.W.C., R.O.H., T.B., J.S.L., M.X.R., D.J.E., G.F., M.v.I., J.P.R., J.D.N., M.B., I.B.D., B.J.S., S.J.W., M.P.C., T.V., P.N.D., and B.K. analyzed the data; S.H., H.B., X.Z., M.K.M., Y.S., T.V., and B.K. wrote the paper; all authors edited and contributed to writing. Competing interests: B.K. is a consultant for Disarm Therapeutics. B.K. and S.H. receive research funding from Disarm Therapeutics. Data and materials availability: Coordinates and structure factors for all crystal structures determined in this study have been deposited in the Protein Data Bank with IDs 6O0S, 6O0T, 6O0R, 6O0Q, 6O0U, 6O1B, 6O0V, and 6O0W.
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Funding Information
Australian Research Council: DP160102244, DP190102526
Australian Research Council: DP160102244, DP190102526
Australian Research Council: FL180100109
Australian Research Council: DE170100783
National Health and Medical Research Council: 1107804, 1160570
National Health and Medical Research Council: 1107804, 1160570
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