MLKL Requires the Inositol Phosphate Code to Execute Necroptosis
Open accessAbstract
Necroptosis is an important form of lytic cell death triggered by injury and infection, but whether mixed lineage kinase domain-like (MLKL) is sufficient to execute this pathway is unknown. In a genetic selection for human cell mutants defective for MLKL-dependent necroptosis, we identified mutations in IPMK and ITPK1, which encode inositol phosphate (IP) kinases that regulate the IP code of soluble molecules. We show that IP kinases are essential for necroptosis triggered by death receptor activation, herpesvirus infection, or a pro-necrotic MLKL mutant. In IP kinase mutant cells, MLKL failed to oligomerize and localize to membranes despite proper receptor-interacting protein kinase-3 (RIPK3)-dependent phosphorylation. We demonstrate that necroptosis requires IP-specific kinase activity and that a highly phosphorylated product, but not a lowly phosphorylated precursor, potently displaces the MLKL auto-inhibitory brace region. These observations reveal control of MLKL-mediated necroptosis by a metabolite and identify a key molecular mechanism underlying regulated cell death.
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IPMK is an important regulator of necroptosis.
“Through a blind genome-scale knockout screening, Dovey et al. [50] identified IPMK as an important regulator of necroptosis.”
From From Obscurity to Prominence: IPMK’s Expanding Role in Cellular Signaling, Physiology, and Disease (2025) · cites this paper as [50]
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“Necroptosis is a specialized lytic cell death pathway [50] often triggered by inflammatory conditions independent of other classical cell death pathways like apoptosis, autophagy, pyroptosis, and ferroptosis.”
Influential
- Authors
- Dovey, C. M., Diep, J., Clarke, B. P., Hale, A. T., McNamara, D. E., Guo, H., Brown, N. W., Cao, J. Y., Grace, C. R., Gough, P. J., Bertin, J., Dixon, S. J., Fiedler, D., Mocarski, E. S., Kaiser, W. J., Moldoveanu, T., York, J. D., & Carette, J. E.
- Affiliations
- Stanford Medicine (US)
- Vanderbilt University (US)
- St. Jude Children's Research Hospital (US)
- The University of Texas at San Antonio Health Science Center (US)
- Princeton University (US)
- Stanford University (US)
- GlaxoSmithKline (United States) (US)
- Leibniz-Forschungsinstitut für Molekulare Pharmakologie (DE)
- Emory University (US)
- Corresponding author
- Carette, Jan E.
- ORCID
- Venue
- Molecular Cell
- Publisher
- Elsevier BV
- Published
- 2018-06
- Volume
- 70
- Issue
- 5
- Pages
- 936-948.e7
- ISSN
- 1097-2765 (ISSN-L)
- PMC
- PMC5994928
- OpenAlex
- W2805282583
- Cited by
- 175
- References
- 4
- Citations by year
- 2026: 12 · 2025: 20 · 2024: 21 · 2023: 17 · 2022: 26 · 2021: 24 · 2020: 23 · 2019: 25 · 2018: 6
- FWCI
- 6.94
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- Molecular Cell (publishedVersion)
- PubMed (publishedVersion)
- Europe PMC (PubMed Central) (acceptedVersion)
- PubMed Central (acceptedVersion)
- Funders
- NIH (T32AI007328, DP2AI104557, 5T32GM007347, R01AI020211, R01GM124404)
- The David and Lucile Packard Foundation
- St. Jude Academic Programs Office Special Postdoctoral Fellowship
- ALSAC
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cell death mechanisms and regulation
- Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Ferroptosis and cancer prognosis
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › NF-κB Signaling Pathways
- Keywords
- necroptosis, MLKL, inositol polyphosphate multikinase, regulated cell death, RIPK3, herpesvirus infection, cell death signaling
- MeSH terms
- Binding Sites, Colonic Neoplasms, Humans, Inositol Phosphates, Mutation, Phosphorylation, Protein Kinases, Tumor Necrosis Factor-alpha, Signal Transduction, Gene Expression Regulation, Enzymologic, Gene Expression Regulation, Neoplastic, Cell Death, Phosphotransferases (Alcohol Group Acceptor), Herpesvirus 1, Human, HT29 Cells, Jurkat Cells, Receptor-Interacting Protein Serine-Threonine Kinases
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